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Nuwantha Fernando
Royal Melbourne Institute of Technology University, Australia

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Original paper
Published: 01 January 2021 in Journal of Aerospace Technology and Management
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Turboelectric distributed propulsion systems are paving the way for more electric aircraft systems (TeDP). This type of system provides a solution for some of the drawbacks of current low-energy-density batteries, which limit the ability of long-endurance electric aircraft. However, turboelectric propulsion requires the use of advanced turboelectric motors, superconductive materials and cryogenic cooling technologies, which are still under development and may be in production in the near future. This paper investigates a turboelectric propulsion system that can be considered an initial step in the production of TeDP in a remotely piloted aircraft system with the use of existing technology. This is achieved by replacing the gear and the starter motor of a turboprop with a high-speed permanent magnet electric machine to generate electrical power and propelling the aircraft through a distributed electric propulsion system. In this theoretical study, an augmentation to Breguet’s range and endurance equation is developed. This study confirmed that the new system is 31% lighter than the turboprop engine. Then the effect of the weight savings is used in the distributed electric propulsion (DEP) aerodynamic studies and found that there is a drastic increase in the range for a TeDP developed with the high-speed machine.

ACS Style

Mithun Eqbal; Nuwantha Fernando; Matthew Marino; Graham Wild. Development of a Turbo Electric Distribution System for Remotely Piloted Aircraft Systems. Journal of Aerospace Technology and Management 2021, 13, 1 .

AMA Style

Mithun Eqbal, Nuwantha Fernando, Matthew Marino, Graham Wild. Development of a Turbo Electric Distribution System for Remotely Piloted Aircraft Systems. Journal of Aerospace Technology and Management. 2021; 13 ():1.

Chicago/Turabian Style

Mithun Eqbal; Nuwantha Fernando; Matthew Marino; Graham Wild. 2021. "Development of a Turbo Electric Distribution System for Remotely Piloted Aircraft Systems." Journal of Aerospace Technology and Management 13, no. : 1.

Review
Published: 24 May 2019 in IEEE Access
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Modern applications demand challenging operation requirements from electrical machines. Variable-flux machine (VFM) concepts are found to offer new opportunities for improved machine design. This paper reviews the VFM technology. Three topologies, mainly the parallel hybrid VFMs, series hybrid VFMs, and Variable-Flux Flux Intensifying type VFMs are discussed in detail. The Variable-Flux Flux Intensifying machines are found to be the state-of-the-art VFM technology available to-date. The paper also reviews the magnetization process in VFMs and relates this with the B-H curve of the magnetic material. The conventional PM machine mathematical model is adapted to represent the operation of VFMs. The different operational limitations of VFMs are explained and the different modes of operation of VFMs have been reviewed and compared. The magnetization state manipulation techniques are reviewed. The AC magnetization is found to be the more preferable approach to reduce weight and manufacturing complexity of VFMs. The trapezoidal current pulse based approach is popular in AC magnetization state manipulation, however, new advanced forms of current vector trajectory control techniques offer comparatively better magnetic state manipulation and higher speed capability for remagnetization of the magnets in VFMs. The paper also reviews the different magnetization state estimation techniques that are useful during control systems development for VFMs. The magnetic material for VFM design is reviewed and potential alternative magnetic material that can satisfy the requirements of VFMs have been identified. Finally, the current status, challenges, as well as the potential of VFMs technology are discussed in the conclusion of the paper.

ACS Style

Rekha Jayarajan; Nuwantha Fernando; Inam Ullah Nutkani. A Review on Variable Flux Machine Technology: Topologies, Control Strategies and Magnetic Materials. IEEE Access 2019, 7, 70141 -70156.

AMA Style

Rekha Jayarajan, Nuwantha Fernando, Inam Ullah Nutkani. A Review on Variable Flux Machine Technology: Topologies, Control Strategies and Magnetic Materials. IEEE Access. 2019; 7 (99):70141-70156.

Chicago/Turabian Style

Rekha Jayarajan; Nuwantha Fernando; Inam Ullah Nutkani. 2019. "A Review on Variable Flux Machine Technology: Topologies, Control Strategies and Magnetic Materials." IEEE Access 7, no. 99: 70141-70156.

Conference paper
Published: 01 April 2018 in 2018 5th International Conference on Electric Power and Energy Conversion Systems (EPECS)
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In this paper, a Fuzzy Logic (FL) based coordinated controller is developed for low voltage ride through (LVRT) enhancement of PMSG based wind energy conversion system (WECS) during symmetrical and asymmetrical grid faults. This coordinated control consists of a pitch angle control, a flux weakening control and a reactive power control. Pitch angle control is adjusted according to the smoothing of wind power fluctuations or the LVRT enhancement. A flux weakening controller is used to reduce the DC link overvoltage. Besides, a reactive power controller is used to achieve continuous operation during grid disturbances. Effectiveness of the proposed coordinated controller is tested under different cases. Numerical simulation results illustrate that some improvements of LVRT and DC-link over voltage reduction are achieved with the proposed coordinated controller.

ACS Style

Papan Dey; Manoj Datta; Nuwantha Fernando; Tomonobu Senjyu. Fuzzy-based Coordinated Control to Reduce DC-link Overvoltage of a PMSG based Wind Energy Systems during Grid Faults. 2018 5th International Conference on Electric Power and Energy Conversion Systems (EPECS) 2018, 1 -6.

AMA Style

Papan Dey, Manoj Datta, Nuwantha Fernando, Tomonobu Senjyu. Fuzzy-based Coordinated Control to Reduce DC-link Overvoltage of a PMSG based Wind Energy Systems during Grid Faults. 2018 5th International Conference on Electric Power and Energy Conversion Systems (EPECS). 2018; ():1-6.

Chicago/Turabian Style

Papan Dey; Manoj Datta; Nuwantha Fernando; Tomonobu Senjyu. 2018. "Fuzzy-based Coordinated Control to Reduce DC-link Overvoltage of a PMSG based Wind Energy Systems during Grid Faults." 2018 5th International Conference on Electric Power and Energy Conversion Systems (EPECS) , no. : 1-6.

Review
Published: 29 March 2018 in Aerospace
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The development of more efficient propulsion systems for aerospace vehicles is essential to achieve key objectives. These objectives are to increase efficiency while reducing the amount of carbon-based emissions. Hybrid electric propulsion (HEP) is an ideal means to maintain the energy density of hydrocarbon-based fuels and utilize energy-efficient electric machines. A system that integrates different propulsion systems into a single system, with one being electric, is termed an HEP system. HEP systems have been studied previously and introduced into Land, Water, and Aerial Vehicles. This work presents research into the use of HEP systems in Remotely Piloted Aircraft Systems (RPAS). The systems discussed in this paper are Internal Combustion Engine (ICE)–Electric Hybrid systems, ICE–Photovoltaic (PV) Hybrid systems, and Fuel-Cell Hybrid systems. The improved performance characteristics in terms of fuel consumption and endurance are discussed.

ACS Style

Mithun Abdul Sathar Eqbal; Nuwantha Fernando; Matthew Marino; Graham Wild. Hybrid Propulsion Systems for Remotely Piloted Aircraft Systems. Aerospace 2018, 5, 34 .

AMA Style

Mithun Abdul Sathar Eqbal, Nuwantha Fernando, Matthew Marino, Graham Wild. Hybrid Propulsion Systems for Remotely Piloted Aircraft Systems. Aerospace. 2018; 5 (2):34.

Chicago/Turabian Style

Mithun Abdul Sathar Eqbal; Nuwantha Fernando; Matthew Marino; Graham Wild. 2018. "Hybrid Propulsion Systems for Remotely Piloted Aircraft Systems." Aerospace 5, no. 2: 34.

Journal article
Published: 12 February 2018 in IEEE Transactions on Energy Conversion
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This paper investigates high-speed surface PM machine design for portable turbo-generator applications. A magnet retention mechanism is used in the rotor due to high-speed operation, and the rotor radius is fixed to achieve certain optimal characteristics. The basis of this paper is to design the stator when the rotor radius has been fixed. The stator designs are populated by different slot/pole combinations, winding arrangements and over a range of possible stack lengths. However, the design is constrained by physical diameter, stack length and electrical volt-ampere constraints. A large number of preliminary machine designs do not satisfy the specified torque/speed requirements under the given volt-ampere constraints and therefore it is ineffective to perform Finite Element analysis on all preliminary design variations. In order to establish the feasibility of a machine design to fulfil the specified torque/speed requirements, the concept of inductance-limits is presented and then linked with stator design parameters. By application of this analysis strategy, a confined optimal set of stator designs are obtained and are subjected to detailed finite element simulations. A final machine design is selected and fabricated. Experimental results are presented for the validation of the final machine design.

ACS Style

Nuwantha Fernando; Puvan Arumugam; Chris Gerada; Weeramundage Udaya Nuwantha Fernando. Design of a Stator for a High-Speed Turbo-Generator With Fixed Permanent Magnet Rotor Radius and Volt–Ampere Constraints. IEEE Transactions on Energy Conversion 2018, 33, 1311 -1320.

AMA Style

Nuwantha Fernando, Puvan Arumugam, Chris Gerada, Weeramundage Udaya Nuwantha Fernando. Design of a Stator for a High-Speed Turbo-Generator With Fixed Permanent Magnet Rotor Radius and Volt–Ampere Constraints. IEEE Transactions on Energy Conversion. 2018; 33 (3):1311-1320.

Chicago/Turabian Style

Nuwantha Fernando; Puvan Arumugam; Chris Gerada; Weeramundage Udaya Nuwantha Fernando. 2018. "Design of a Stator for a High-Speed Turbo-Generator With Fixed Permanent Magnet Rotor Radius and Volt–Ampere Constraints." IEEE Transactions on Energy Conversion 33, no. 3: 1311-1320.

Conference paper
Published: 01 February 2018 in 2018 IEEE International Conference on Industrial Technology (ICIT)
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This paper presents a coordinated control which combines pitch angle of a wind turbine, flux control of permanent magnet synchronous generator (PMSG) and reactive power control of grid to enhance the low voltage ride through (LVRT) capability of PMSG based variable speed wind energy conversion system (WECS). The design process of controller parameters and the stability of proposed control strategy have been analysed. In this strategy, pitch angle controller is modified to adjust the pitch for power smoothing as well as LVRT during variable wind speed and grid fault respectively. Flux weakening controller is used to reduce the flux linkages of PMSG by supplying negative field regulating current to reduce the DC link overvoltage during grid voltage dips. Additionally, static compensator (STATCOM) is used to provide reactive power support during grid fault. Extensive simulations of proposed method have been carried out under different cases. The performance of the proposed controller is validated by time series simulation. The results are compared with Braking chopper (BC) based conventional control for verification.

ACS Style

Papan Dey; Manoj Datta; Nuwantha Fernando; Tomonobu Senjyu. Fault-ride-through performance improvement of a PMSG based wind energy systems via coordinated control of STATCOM. 2018 IEEE International Conference on Industrial Technology (ICIT) 2018, 1236 -1241.

AMA Style

Papan Dey, Manoj Datta, Nuwantha Fernando, Tomonobu Senjyu. Fault-ride-through performance improvement of a PMSG based wind energy systems via coordinated control of STATCOM. 2018 IEEE International Conference on Industrial Technology (ICIT). 2018; ():1236-1241.

Chicago/Turabian Style

Papan Dey; Manoj Datta; Nuwantha Fernando; Tomonobu Senjyu. 2018. "Fault-ride-through performance improvement of a PMSG based wind energy systems via coordinated control of STATCOM." 2018 IEEE International Conference on Industrial Technology (ICIT) , no. : 1236-1241.

Conference paper
Published: 01 February 2018 in 2018 IEEE International Conference on Industrial Technology (ICIT)
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This paper presents a coordinated control of pitch angle of a wind turbine, flux control of permanent magnet synchronous generator (PMSG) and voltage regulation of grid for low voltage ride through (LVRT) enhancement of PMSG based variable speed wind energy conversion system (WECS). Within this strategy, pitch angle controller is modified to adjust the pitch for power smoothing during variable wind speed as well as LVRT during repetitive grid fault. Flux controller is used to weakening the induced flux through providing negative field regulating current to keep the DC link voltage within the permissible limit in grid voltage dips. And reactive power control is used to provide voltage support during a grid fault. Extensive simulations of proposed method have been carried out under different repetitive fault. The proposed controller performance is validated by time series simulation. The results are compared with different conventional control for verification.

ACS Style

Papan Dey; Manoj Datta; Nuwantha Fernando; Tomonobu Senjyu. Coordinated control technique of PMSG based wind energy conversion system during repetitive grid fault. 2018 IEEE International Conference on Industrial Technology (ICIT) 2018, 915 -920.

AMA Style

Papan Dey, Manoj Datta, Nuwantha Fernando, Tomonobu Senjyu. Coordinated control technique of PMSG based wind energy conversion system during repetitive grid fault. 2018 IEEE International Conference on Industrial Technology (ICIT). 2018; ():915-920.

Chicago/Turabian Style

Papan Dey; Manoj Datta; Nuwantha Fernando; Tomonobu Senjyu. 2018. "Coordinated control technique of PMSG based wind energy conversion system during repetitive grid fault." 2018 IEEE International Conference on Industrial Technology (ICIT) , no. : 915-920.

Conference paper
Published: 01 December 2017 in 2017 IEEE Innovative Smart Grid Technologies - Asia (ISGT-Asia)
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Increase in load demand require upgrade of distribution transformers and significant investments. An alternative to a complete overhaul of the distribution transformer is to operate a solid state transformer in parallel with the line frequency transformer. This allows functionality to either share the load or accommodate overload conditions. In addition, other options for superior distribution system voltage control may be present. This paper focuses on the parallel operation and control strategy for a 33 kV/415 V, 200 kVA distribution transformer with a 200 kVA parallel solid state transformer. Two control strategies, namely parallel load sharing operation and overload accommodation are investigated. Simulation results are presented for the parallel operation of a SST with a LFT and the effectiveness of the two strategies are discussed.

ACS Style

Nuwantha Fernando; Lasantha Meegahapola; Chathura Thilakarathne. Solid state transformer parallel operation with a tap changing line frequency transformer. 2017 IEEE Innovative Smart Grid Technologies - Asia (ISGT-Asia) 2017, 1 -6.

AMA Style

Nuwantha Fernando, Lasantha Meegahapola, Chathura Thilakarathne. Solid state transformer parallel operation with a tap changing line frequency transformer. 2017 IEEE Innovative Smart Grid Technologies - Asia (ISGT-Asia). 2017; ():1-6.

Chicago/Turabian Style

Nuwantha Fernando; Lasantha Meegahapola; Chathura Thilakarathne. 2017. "Solid state transformer parallel operation with a tap changing line frequency transformer." 2017 IEEE Innovative Smart Grid Technologies - Asia (ISGT-Asia) , no. : 1-6.

Conference paper
Published: 01 August 2017 in 2017 20th International Conference on Electrical Machines and Systems (ICEMS)
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Modern developments in advanced material technology have produced new magnetic materials capable of dealing with high frequencies. However, such metals typically have low mechanical strength and they are found to be brittle. In order to manufacture electromechanical devices with such new materials, it has to be reinforced with a mechanically strong structure. One option is to incorporate stronger core materials, such as Si-steel sandwiched together with the high performance material resulting in a multi-magnetic material laminated core (MMLC). The MMLCs also allow the opportunity shape the effective magnetic properties to certain extent. In this paper, the homogenization of MMLC BH characteristics and a strategy to calculate the core loss properties of an MMLC constructed with two materials is developed using the individual properties of the materials.

ACS Style

Subrato Saha; Nuwantha Fernando; Lasantha Meegahapola. Multi magnetic material laminated cores: Concept and modelling. 2017 20th International Conference on Electrical Machines and Systems (ICEMS) 2017, 1 -5.

AMA Style

Subrato Saha, Nuwantha Fernando, Lasantha Meegahapola. Multi magnetic material laminated cores: Concept and modelling. 2017 20th International Conference on Electrical Machines and Systems (ICEMS). 2017; ():1-5.

Chicago/Turabian Style

Subrato Saha; Nuwantha Fernando; Lasantha Meegahapola. 2017. "Multi magnetic material laminated cores: Concept and modelling." 2017 20th International Conference on Electrical Machines and Systems (ICEMS) , no. : 1-5.

Journal article
Published: 19 July 2017 in IEEE Transactions on Energy Conversion
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Magnetic geared machines are based on the flux-modulation principle and typically constructed with a flux-modulated double rotor (FMDR). The modulator experiences high torsional stresses when designed for high torque transmission. This result in modulator deformation and pose a significant risk of failure of the FMDR. In this paper, the FMDR design options are investigated with mechanical and electromagnetic FE modeling. The addition of filler material in between the poles reduce the shear stresses by 61.7% to 87.2% at the cost of 2.6% to 3.2% lower pull-out torque. Increase in pole number is shown to increase localized stress levels in bridged modulators. Electromagnetic simulations show that the highest pull-out torque is at an optimal pole number. The trade-off between FMDR weight, losses and shear stress are discussed. A scaled-size prototype FMDR with a bridged modulator is constructed. The FMDR is tested and achieves comparable results with the FE simulations. At field intensity levels above 600 kA/m in the periphery of the FMDR, the end effects are prominent and experiences a reduced pull-out torque 28.7% lower in comparison with 3D simulations. The losses at different load levels of the FMDR are also compared and experimental result confirm the FE results.

ACS Style

Nuwantha Fernando; Subrato Saha. Torsional Shear Stress Minimization Techniques and Implications on Electromagnetic Performance of Flux-Modulated Double Rotors. IEEE Transactions on Energy Conversion 2017, 33, 49 -58.

AMA Style

Nuwantha Fernando, Subrato Saha. Torsional Shear Stress Minimization Techniques and Implications on Electromagnetic Performance of Flux-Modulated Double Rotors. IEEE Transactions on Energy Conversion. 2017; 33 (1):49-58.

Chicago/Turabian Style

Nuwantha Fernando; Subrato Saha. 2017. "Torsional Shear Stress Minimization Techniques and Implications on Electromagnetic Performance of Flux-Modulated Double Rotors." IEEE Transactions on Energy Conversion 33, no. 1: 49-58.

Journal article
Published: 29 June 2017 in IEEE Transactions on Instrumentation and Measurement
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Synchrophasors are an emerging power system wide-area dynamic performance monitoring and control technology. The IEEE standard C37.118.1 outlines specifications for the construction of synchrophasor units, in which two reference synchrophasor models are proposed for protection (P-type) and measurement (M-type) purposes. This paper develops improved synchrophasor models for power system dynamic stability/performance evaluation based on the reference architecture proposed in the IEEE standard C37.118.1, considering frequency error (FE) and the total vector error (TVE) as the main performance indices. The quadrature demodulation filters are designed explicitly considering the impact of harmonic distortion and out-of-band interference, and thus optimized quadrature demodulation filters improve estimation performance during adverse conditions. Furthermore, a special emphasis is placed on the input low-pass filter to attenuate high-frequency components above the Nyquist rate. The improved synchrophasor models are rigorously tested to ensure compliance with performance requirements stipulated in the IEEE standard. Results show that improved synchrophasor models significantly enhance the FE while ensuring compliance requirements for the TVE.

ACS Style

Chathura Thilakarathne; Lasantha Meegahapola; Nuwantha Fernando. Improved Synchrophasor Models for Power System Dynamic Stability Evaluation Based on IEEE C37.118.1 Reference Architecture. IEEE Transactions on Instrumentation and Measurement 2017, 66, 2937 -2947.

AMA Style

Chathura Thilakarathne, Lasantha Meegahapola, Nuwantha Fernando. Improved Synchrophasor Models for Power System Dynamic Stability Evaluation Based on IEEE C37.118.1 Reference Architecture. IEEE Transactions on Instrumentation and Measurement. 2017; 66 (11):2937-2947.

Chicago/Turabian Style

Chathura Thilakarathne; Lasantha Meegahapola; Nuwantha Fernando. 2017. "Improved Synchrophasor Models for Power System Dynamic Stability Evaluation Based on IEEE C37.118.1 Reference Architecture." IEEE Transactions on Instrumentation and Measurement 66, no. 11: 2937-2947.

Review
Published: 15 February 2017 in Inventions
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Ship microgrids have recently received increased attention, mainly due to the extensive use of power electronically interfaced loads and sources. Characteristics of these microgrids are similar to islanded terrestrial microgrids, except the presence of highly dynamic large loads, such as propulsion loads. The presence of such loads and sources with power-electronic converter interfaces lead to severe power quality issues in ship microgrids. Generally, these issues can be classified as voltage variations, frequency variations and waveform distortions which are commonly referred to as harmonic distortions. Amongst the solutions identified, energy storage is considered to be the most promising technology for mitigating voltage and/or frequency deviations. Passive filtering is the commonly used technology for reducing harmonic distortions, which requires bulky capacitors and inductors. Active filtering is emerging as an alternative, which could be realised even within the same interfacing converter of the energy storage system. The aim of this paper is to investigate recent developments in these areas and provide readers with a critical review on power quality issues, energy storage technologies and strategies that could be used to improve the power quality in ship microgrids. Moreover, a brief introduction to ship power system architectures is also presented in the paper.

ACS Style

Shantha Gamini Jayasinghe; Lasantha Meegahapola; Nuwantha Fernando; Zheming Jin; Josep M. Guerrero. Review of Ship Microgrids: System Architectures, Storage Technologies and Power Quality Aspects. Inventions 2017, 2, 4 .

AMA Style

Shantha Gamini Jayasinghe, Lasantha Meegahapola, Nuwantha Fernando, Zheming Jin, Josep M. Guerrero. Review of Ship Microgrids: System Architectures, Storage Technologies and Power Quality Aspects. Inventions. 2017; 2 (1):4.

Chicago/Turabian Style

Shantha Gamini Jayasinghe; Lasantha Meegahapola; Nuwantha Fernando; Zheming Jin; Josep M. Guerrero. 2017. "Review of Ship Microgrids: System Architectures, Storage Technologies and Power Quality Aspects." Inventions 2, no. 1: 4.

Conference paper
Published: 09 February 2017 in 2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC)
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Fault tolerance is an essential feature in marine and naval electric propulsion drives. Therefore, there is a growing research interest in developing fault tolerant technologies for marine applications. This paper investigates the control and operation of an inverter fed PM propulsion motor under a specific power electronic failure case. Compared to the technologies reported in literature, this paper formulates a special control strategy for the motor operation during the situation where only one high side switch and one low side switch in two different phases are operational in a standard three-phase six-switch inverter. The proposed control strategy assumes that the remaining switches are failed in open circuit while the corresponding anti-parallel diodes are functional. The mathematical background of the two quadrant control strategy is formulated. The operation is analyzed in the context of marine propulsion power/speed requirements. Simulations for a 50 kW three-phase fault tolerant motor is presented for the operation with the proposed dual switch control strategy. Controllability of motor torque for speeds up to 45% rated speed corresponding to approximately 9% rated propulsion power output is achieved without overrating the device current ratings.

ACS Style

Nuwantha Fernando; Shantha Gamini Jayasinghe; Alireza Tashakori Abkenar. Marine propulsion PM motor control under inverter partial fault. 2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC) 2017, 1 -6.

AMA Style

Nuwantha Fernando, Shantha Gamini Jayasinghe, Alireza Tashakori Abkenar. Marine propulsion PM motor control under inverter partial fault. 2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC). 2017; ():1-6.

Chicago/Turabian Style

Nuwantha Fernando; Shantha Gamini Jayasinghe; Alireza Tashakori Abkenar. 2017. "Marine propulsion PM motor control under inverter partial fault." 2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC) , no. : 1-6.

Conference paper
Published: 09 February 2017 in 2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC)
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The colloquial term ‘cold-ironing’ refers to the shore power connection when a ship is at berth. Even though, cold-ironing is not new to the shipping industry only recently it received more attention, mainly due to strict emission regulations. When a ship receives shore power, its emissions can be eliminated and thus cold-ironing is becoming a popular service sought by ships that berth at emission controlled ports. Generally, the shore power connection is available only at berth and thus emissions from the ships that are anchored in and around the port is still a significant issue. This paper proposes a floating power platform for ‘Mobile Cold-ironing’ of anchored ships. In the proposed system, a fuel cell — battery hybrid system is used as the source. Efficacy of the proposed system in supplying dynamic loads is verified with simulation results.

ACS Style

Shantha Gamini Jayasinghe; Monaaf Al-Falahi; Hossein Enshaei; Nuwantha Fernando; Alireza Tashakori. Floating power platforms for mobile cold-ironing. 2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC) 2017, 1 -5.

AMA Style

Shantha Gamini Jayasinghe, Monaaf Al-Falahi, Hossein Enshaei, Nuwantha Fernando, Alireza Tashakori. Floating power platforms for mobile cold-ironing. 2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC). 2017; ():1-5.

Chicago/Turabian Style

Shantha Gamini Jayasinghe; Monaaf Al-Falahi; Hossein Enshaei; Nuwantha Fernando; Alireza Tashakori. 2017. "Floating power platforms for mobile cold-ironing." 2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC) , no. : 1-5.

Conference paper
Published: 09 February 2017 in 2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC)
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This paper presents the control of an electromagnetic clutch. The considered clutch is particularly based on the modulated field principle and has two shafts with speed ratio of 1.14 at synchronous conditions. The clutch engagement and disengagement and torque transmission is controlled by manipulation of the stator currents and the slip speed between the two shafts. The dynamic model of the electromagnetic clutch is found to be nearly identical to that of a permanent magnet synchronous machine, however the electrical speed is replaced by the slip speed. The relationship between the torque transmission between the input and output shafts and the electrical power input is explained. A clutch control strategy based on the d-q current control is presented. The test bed setup with the experimental prototype electromagnetic clutch is presented and the simulation results for this prototype is presented. It is shown that the electrical power demanded by the clutch is high only during engagement and disengagement transient periods and the steady state power is only required to compensate the electrical losses in the clutch. Experimental results demonstrate the controllability of the clutch with the proposed strategy.

ACS Style

Nuwantha Fernando. A field modulated electromagnetic clutch with slip control. 2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC) 2017, 1 -6.

AMA Style

Nuwantha Fernando. A field modulated electromagnetic clutch with slip control. 2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC). 2017; ():1-6.

Chicago/Turabian Style

Nuwantha Fernando. 2017. "A field modulated electromagnetic clutch with slip control." 2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC) , no. : 1-6.

Conference paper
Published: 01 November 2016 in 2016 IEEE Region 10 Conference (TENCON)
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Low Voltage Ride-Through (LVRT) is one of the most important grid connection requirements for the wind energy conversion systems (WECS). In this paper, flux weakening control of permanent magnet synchronous generator (PMSG) based WECS is proposed to reduce the DC-link capacitor overvoltage for the enhancement of LVRT during symmetrical and asymmetrical grid voltage dips. The controller is developed based on the proportional resonant (PR) current controller. The proposed method is compared with the braking chopper (BC) based conventional method. Time series simulation results illustrate the validity and effectiveness of the proposed control.

ACS Style

Papan Dey; Manoj Datta; Nuwantha Fernando; Tomonobu Senjyu. A method to reduce DC-link overvoltage of PMSG based WECS during LVRT. 2016 IEEE Region 10 Conference (TENCON) 2016, 1894 -1899.

AMA Style

Papan Dey, Manoj Datta, Nuwantha Fernando, Tomonobu Senjyu. A method to reduce DC-link overvoltage of PMSG based WECS during LVRT. 2016 IEEE Region 10 Conference (TENCON). 2016; ():1894-1899.

Chicago/Turabian Style

Papan Dey; Manoj Datta; Nuwantha Fernando; Tomonobu Senjyu. 2016. "A method to reduce DC-link overvoltage of PMSG based WECS during LVRT." 2016 IEEE Region 10 Conference (TENCON) , no. : 1894-1899.

Conference paper
Published: 01 November 2016 in 2016 IEEE Region 10 Conference (TENCON)
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A flux weakening control method of permanent magnet synchronous generator (PMSG) based wind energy conversion system (WECS) is adopted in this paper to minimize the DC-link overvoltage during grid faults. This method weakens the flux of PMSG by supplying negative field regulating current to use the maximum voltage limit of the converter. The proposed method is developed based on the synchronous reference frame (SRF) PI and the stationary frame (SF) PI current controllers. Comparison of these current controllers has been presented through time series simulation results. From the simulation results, it is evident that the stationary frame PI current controller based flux weakening provides better performances in low voltage ride through (LVRT) enhancement during symmetrical and asymmetrical grid faults.

ACS Style

Papan Dey; Manoj Datta; Nuwantha Fernando; Tomonobu Senjyu. Comparison of synchronous and stationary frame pi based flux weakening controls for DC-link overvoltage minimisation of WECS under grid fault. 2016 IEEE Region 10 Conference (TENCON) 2016, 655 -660.

AMA Style

Papan Dey, Manoj Datta, Nuwantha Fernando, Tomonobu Senjyu. Comparison of synchronous and stationary frame pi based flux weakening controls for DC-link overvoltage minimisation of WECS under grid fault. 2016 IEEE Region 10 Conference (TENCON). 2016; ():655-660.

Chicago/Turabian Style

Papan Dey; Manoj Datta; Nuwantha Fernando; Tomonobu Senjyu. 2016. "Comparison of synchronous and stationary frame pi based flux weakening controls for DC-link overvoltage minimisation of WECS under grid fault." 2016 IEEE Region 10 Conference (TENCON) , no. : 655-660.

Proceedings article
Published: 01 November 2016 in 2016 IEEE Innovative Smart Grid Technologies - Asia (ISGT-Asia)
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Fault Ride-Through (FRT) is one of the most essential grid connection requirements for the grid connected permanent magnet synchronous generator (PMSG) based wind energy conversion system (WECS). A flux weakening method of PMSG based WECS is proposed in this paper to reduce DC-link capacitor overvoltage for the enhancement of FRT during symmetrical and asymmetrical grid faults. The proposed method is developed based on the proportional integral (PI) and the proportional resonant (PR) current controllers. Comparisons of the two current controllers have been presented through time series simulation results. It has been found that PR current controller based flux weakening method shows better performance in limiting Dc-link capacitor overvoltage during grid faults.

ACS Style

Papan Dey; Manoj Datta; Nuwantha Fernando. Comparisons of PI and PR current controllers based flux weakening to limit DC-link capacitor overvoltage in PMSG based wind energy system. 2016 IEEE Innovative Smart Grid Technologies - Asia (ISGT-Asia) 2016, 29 -34.

AMA Style

Papan Dey, Manoj Datta, Nuwantha Fernando. Comparisons of PI and PR current controllers based flux weakening to limit DC-link capacitor overvoltage in PMSG based wind energy system. 2016 IEEE Innovative Smart Grid Technologies - Asia (ISGT-Asia). 2016; ():29-34.

Chicago/Turabian Style

Papan Dey; Manoj Datta; Nuwantha Fernando. 2016. "Comparisons of PI and PR current controllers based flux weakening to limit DC-link capacitor overvoltage in PMSG based wind energy system." 2016 IEEE Innovative Smart Grid Technologies - Asia (ISGT-Asia) , no. : 29-34.

Journal article
Published: 07 July 2016 in IEEE Transactions on Industrial Electronics
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This paper investigates the effect of two soft magnetic materials on a high-speed machine design, namely, 6.5% silicon steel and cobalt-iron alloy. The effect of design parameters on the machine performance as an aircraft starter-generator is analyzed. The material properties which include B-H characteristics and the losses are obtained at different frequencies under an experiment and used to predict the machine performance accurately. In the investigation presented in this paper, it is shown that machines designed with 6.5% silicon steel at a high core flux density has lower weight and lower losses than the cobalt-iron alloy designs. This is mainly due to the extra weight contributed by the copper content especially in the end-windings. Due to the high operating frequencies, the core losses in the cobalt-iron machine designs are found to outweigh the copper losses incurred in the silicon steel machines. It is also shown that change in stack length/number of turns has a considerable effect on the copper losses at starting, however has no significant advantage on rated efficiency which happens to be in a field-weakening operating point. It is also shown that the performance of the machine designs depends significantly on material selection and the operating point of the core. The implications of the variation of design parameters on the machine performance is discussed and provide insight into the influence of parameters that effect overall power density.

ACS Style

Nuwantha Fernando; Gaurang Vakil; Puvaneswaran Arumugam; Emmanuel K. Amankwah; Chris Gerada; Serhiy Bozhko. Impact of Soft Magnetic Material on Design of High-Speed Permanent-Magnet Machines. IEEE Transactions on Industrial Electronics 2016, 64, 2415 -2423.

AMA Style

Nuwantha Fernando, Gaurang Vakil, Puvaneswaran Arumugam, Emmanuel K. Amankwah, Chris Gerada, Serhiy Bozhko. Impact of Soft Magnetic Material on Design of High-Speed Permanent-Magnet Machines. IEEE Transactions on Industrial Electronics. 2016; 64 (3):2415-2423.

Chicago/Turabian Style

Nuwantha Fernando; Gaurang Vakil; Puvaneswaran Arumugam; Emmanuel K. Amankwah; Chris Gerada; Serhiy Bozhko. 2016. "Impact of Soft Magnetic Material on Design of High-Speed Permanent-Magnet Machines." IEEE Transactions on Industrial Electronics 64, no. 3: 2415-2423.

Conference paper
Published: 01 January 2016 in 8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016)
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Inspec keywords: invertors; rectifiers; permanent magnet machines; inductance Subjects: a.c. machines; d.c. machines

ACS Style

W.U. Nuwantha Fernando; P. Arumugam; C. Gerada. Volt-Ampere Constrains and its Influence on Inductance Limits in High Speed PM Machine Design. 8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016) 2016, 6 . -6 ..

AMA Style

W.U. Nuwantha Fernando, P. Arumugam, C. Gerada. Volt-Ampere Constrains and its Influence on Inductance Limits in High Speed PM Machine Design. 8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016). 2016; ():6 .-6 ..

Chicago/Turabian Style

W.U. Nuwantha Fernando; P. Arumugam; C. Gerada. 2016. "Volt-Ampere Constrains and its Influence on Inductance Limits in High Speed PM Machine Design." 8th IET International Conference on Power Electronics, Machines and Drives (PEMD 2016) , no. : 6 .-6 ..