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Dr. Muhammed Worku
King Fahd University of Petroleum and Minerals

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0 microgrid
0 Power System Control
0 Power electronics and drives
0 Power System Analysis and Simulation
0 Renewable and Sustainable Energy

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Journal article
Published: 21 April 2021 in Mathematics
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Nowadays, behaving as constant power loads (CPLs), rectifiers and voltage regulators are extensively used in microgrids (MGs). The MG dynamic behavior challenges both stability and control effectiveness in the presence of CPLs. CPLs characteristics such as negative incremental resistance, synchronization, and control loop dynamic with similar frequency range of the inverter disturb severely the MG stability. Additionally, the MG stability problem will be more sophisticated with a high penetration level of CPLs in MGs. The stability analysis becomes more essential especially with high-penetrated CPLs. In this paper, the dynamic stability performance of an MG involving a high penetration level of CPLs is analyzed and investigated. An autonomous MG engaging a number of CPLs and inverter distributed generations (DGs) is modeled and designed using MATLAB. Voltage, current, and power controllers are optimally designed, controlling the inverter DGs output. A power droop controller is implemented to share the output DGs powers. Meanwhile, the current and voltage controllers are employed to control the output voltage and current of all DGs. A phase-locked loop (PLL) is essentially utilized to synchronize the CPLs with the MG. The controller gains of the inverters, CPLs, power sharing control, and PLL are optimally devised using particle swarm optimization (PSO). As a weighted objective function, the error in the DC voltage of the CPL and active power of the DG is minimized in the optimal problem based on the time-domain simulation. Under the presence of high penetrated CPLs, all controllers are coordinately tuned to ensure an enhanced dynamic stability of the MG. The impact of the highly penetrated CPLs on the MG dynamic stability is investigated. To confirm the effectiveness of the proposed technique, different disturbances are applied. The analysis shows that the MG system experiences the instability challenges due to the high penetrated CPLs. The simulation results confirm the effectiveness of the proposed method to improve the MG dynamic stability performance.

ACS Style

Mohamed Hassan; Muhammed Worku; Abdelfattah Eladl; Mohammed Abido. Dynamic Stability Performance of Autonomous Microgrid Involving High Penetration Level of Constant Power Loads. Mathematics 2021, 9, 922 .

AMA Style

Mohamed Hassan, Muhammed Worku, Abdelfattah Eladl, Mohammed Abido. Dynamic Stability Performance of Autonomous Microgrid Involving High Penetration Level of Constant Power Loads. Mathematics. 2021; 9 (9):922.

Chicago/Turabian Style

Mohamed Hassan; Muhammed Worku; Abdelfattah Eladl; Mohammed Abido. 2021. "Dynamic Stability Performance of Autonomous Microgrid Involving High Penetration Level of Constant Power Loads." Mathematics 9, no. 9: 922.

Research article electrical engineering
Published: 03 January 2021 in Arabian Journal for Science and Engineering
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This paper presents an efficient power management, voltage balancing and grid synchronization control strategy to increase the stability and reliability of distributed energy resources (DERs)-based microgrid. The microgrid is composed of Photovoltaic, Double Fed Induction Generator-based wind and diesel generator with critical and non-critical loads. The system model and the control strategy have been developed in Real Time Digital Simulator. The coordination and power management of the DERs in both grid connected and island operation modes is implemented. One distinct challenge of microgrid operation in island mode is the stable control of frequency. A controller is proposed and implemented in the island mode for the diesel generator equipped with the required inertia to maintain the microgrid rated frequency by operating in the isochronous mode. To restore the microgrid back to the utility, the voltage, frequency and phase angle of the islanded microgrid should match with that of the grid network within specified limits to avoid transient instability. Switched capacitor banks are connected at the point of common coupling to balance the voltage for microgrid synchronization. The CIGRE medium voltage test bench system is used to implement the DERs and their controller. The proposed control approach has potential applications for the complete operation of microgrids by properly controlling the power, voltage and frequency in both grid and island modes. The real time digital simulator results verify the effectiveness and superiority of the proposed control scheme in grid connected, island and grid resynchronization scenarios.

ACS Style

Muhammed Y. Worku; Mohamed A. Hassan; Mohamed A. Abido. Power Management, Voltage Control and Grid Synchronization of Microgrids in Real Time. Arabian Journal for Science and Engineering 2021, 46, 1411 -1429.

AMA Style

Muhammed Y. Worku, Mohamed A. Hassan, Mohamed A. Abido. Power Management, Voltage Control and Grid Synchronization of Microgrids in Real Time. Arabian Journal for Science and Engineering. 2021; 46 (2):1411-1429.

Chicago/Turabian Style

Muhammed Y. Worku; Mohamed A. Hassan; Mohamed A. Abido. 2021. "Power Management, Voltage Control and Grid Synchronization of Microgrids in Real Time." Arabian Journal for Science and Engineering 46, no. 2: 1411-1429.

Journal article
Published: 10 September 2020 in Electronics
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In this paper, an efficient under frequency control and the energy management of a distributed energy resources (DERs)-based microgrid is presented. The microgrid is composed of a photovoltaic (PV), double-fed induction generator (DFIG)-based wind and diesel generator with critical and non-critical loads. The system model and the control strategy are developed in a real time digital simulator (RTDS). The coordination and power management of the DERs in both grid-connected and islanded operation modes are implemented. During power imbalances and frequency fluctuations caused by fault or islanding, an advanced automatic load shedding control is implemented to regulate and maintain the microgrid frequency at its rated value. One distinct feature implemented for the load shedding operation is that highly unbalanced critical loads are connected to the microgrid. The diesel generator provides the required inertia in the islanded mode to maintain the microgrid rated frequency by operating in the isochronous mode. The International Council on Large Electric Systems (CIGRE) medium voltage (MV) test bench system is used to implement the DERs and their controller. The proposed control approach has potential applications for the complete operation of microgrids by properly controlling the power, voltage and frequency in both grid-connected and island modes. The real time digital simulator results verify the effectiveness and superiority of the proposed control scheme in grid connected, island and fault conditions.

ACS Style

Muhammed Y. Worku; Mohamed Hassan; Mohamed A. Abido. Real Time-Based under Frequency Control and Energy Management of Microgrids. Electronics 2020, 9, 1487 .

AMA Style

Muhammed Y. Worku, Mohamed Hassan, Mohamed A. Abido. Real Time-Based under Frequency Control and Energy Management of Microgrids. Electronics. 2020; 9 (9):1487.

Chicago/Turabian Style

Muhammed Y. Worku; Mohamed Hassan; Mohamed A. Abido. 2020. "Real Time-Based under Frequency Control and Energy Management of Microgrids." Electronics 9, no. 9: 1487.

Journal article
Published: 21 October 2019 in Sustainability
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Distributed generation (DG) units are utilized to feed their closed loads in the autonomous microgrid. While in the grid-connected microgrid, they are integrated to support the utility by their required real and reactive powers. To achieve this goal, these integrated DGs must be controlled well. In this paper, an optimal PQ control scheme is proposed to control and share a predefined injected real and reactive powers of the inverter based DGs. The control problem is optimally designed and investigated to search for the optimal controller parameters by minimizing the error between the reference and calculated powers using particle swarm optimization (PSO). Microgrid containing inverter-based DG, PLL, coupling inductance, LC filter, power and current controllers is implemented on MATLAB. Two microgrid cases with different structure are studied and discussed. In both cases, the microgrid performance is investigated under different disturbances such as three-phase fault and step changes. The simulation results show that the proposed optimal control improves the microgrid dynamic stability. Additionally, the considered microgrids are implemented on real time digital simulator (RTDS). The experimental results verify the effectiveness and tracking capability of the proposed controllers and show close agreement with the simulation results. Finally, the comparison with the literature confirms the effectiveness of the proposed control scheme.

ACS Style

Mohamed Hassan; Muhammed Y. Worku; Mohamed A. Abido. Optimal Power Control of Inverter-Based Distributed Generations in Grid-Connected Microgrid. Sustainability 2019, 11, 5828 .

AMA Style

Mohamed Hassan, Muhammed Y. Worku, Mohamed A. Abido. Optimal Power Control of Inverter-Based Distributed Generations in Grid-Connected Microgrid. Sustainability. 2019; 11 (20):5828.

Chicago/Turabian Style

Mohamed Hassan; Muhammed Y. Worku; Mohamed A. Abido. 2019. "Optimal Power Control of Inverter-Based Distributed Generations in Grid-Connected Microgrid." Sustainability 11, no. 20: 5828.

Journal article
Published: 16 January 2019 in Energies
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An efficient power management control for microgrids with energy storage is presented in this paper. The proposed control scheme increases the reliability and resiliency of the microgrid based on three distributed energy resources (DERs), namely Photovoltaic (PV), battery, and diesel generator with local active loads. Coordination among the DERs with energy storage is essential for microgrid management. The system model and the control strategy were developed in Real Time Digital Simulator (RTDS). Decoupled d-q current control strategy is proposed and implemented for voltage source converters (VSCs) used to interface the PV and battery sources to the AC grid. A dc-dc buck converter with a maximum power point tracking function is implemented to maximize the intermittent energy generation from the PV array. A controller is proposed and employed for both grid connected and island modes of operation. In grid connected mode, the system frequency and voltage are regulated by the grid. During a fault in island mode, the diesel generator controls the system frequency and voltage in isochronous mode. Results based on the real time digital simulator are provided to verify the superiority and effectiveness of the proposed control scheme.

ACS Style

Muhammed Y. Worku; Mohamed Hassan; Mohamed A. Abido. Real Time Energy Management and Control of Renewable Energy based Microgrid in Grid Connected and Island Modes. Energies 2019, 12, 276 .

AMA Style

Muhammed Y. Worku, Mohamed Hassan, Mohamed A. Abido. Real Time Energy Management and Control of Renewable Energy based Microgrid in Grid Connected and Island Modes. Energies. 2019; 12 (2):276.

Chicago/Turabian Style

Muhammed Y. Worku; Mohamed Hassan; Mohamed A. Abido. 2019. "Real Time Energy Management and Control of Renewable Energy based Microgrid in Grid Connected and Island Modes." Energies 12, no. 2: 276.

Dataset
Published: 01 January 2019 in [Set Bioenergy, vol. 1+2]
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This paper proposes an efficient power smoothing control strategy for variable speed grid connected permanent magnet synchronous generator (PMSG) based wind turbine generator (WTG) with supercapacitor energy storage system (SCESS). As WTG installations are increasing, these systems generate a fluctuated output power as a result of varying wind speed and need to have a power smoothing capability to have a smooth output power profile. The optimal size of the SCESS is determined and a controller is proposed and implemented to continuously charge and discharge the SCESS to achieve its objectives. The SCESS is exploited to minimize the short term fluctuation to have a smooth power profile during normal operation. A bi-directional buck boost converter is used to integrate the SCESS with the system. Two back to back connected three level Neutral Point Clamped (NPC) converters are used for the power conversion. The control strategy and the system model have been developed for the NPCs, the buck boost converter and the variable speed WTG system. The Real Time Digital Simulator (RTDS) based results conducted on 2 MW/4 kV PMSG verify the effectiveness and superiority of the proposed controller.

ACS Style

Muhammed Y. Worku. Power Smoothing Control of PMSG Based Wind Generation Using Supercapacitor Energy Storage System. [Set Bioenergy, vol. 1+2] 2019, 1 .

AMA Style

Muhammed Y. Worku. Power Smoothing Control of PMSG Based Wind Generation Using Supercapacitor Energy Storage System. [Set Bioenergy, vol. 1+2]. 2019; ():1.

Chicago/Turabian Style

Muhammed Y. Worku. 2019. "Power Smoothing Control of PMSG Based Wind Generation Using Supercapacitor Energy Storage System." [Set Bioenergy, vol. 1+2] , no. : 1.

Journal article
Published: 01 May 2018 in Energies
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Controller gains and power-sharing parameters are the main parameters affect the dynamic performance of the microgrid. Considering an active load to the autonomous microgrid, the stability problem will be more involved. In this paper, the active load effect on microgrid dynamic stability is explored. An autonomous microgrid including three inverter-based distributed generations (DGs) with an active load is modeled and the associated controllers are designed. Controller gains of the inverters and active load as well as Phase Locked Loop (PLL) parameters are optimally tuned to guarantee overall system stability. A weighted objective function is proposed to minimize the error in both measured active power and DC voltage based on time-domain simulations. Different AC and DC disturbances are applied to verify and assess the effectiveness of the proposed control strategy. The results demonstrate the potential of the proposed controller to enhance the microgrid stability and to provide efficient damping characteristics. Additionally, the proposed controller is compared with the literature to demonstrate its superiority. Finally, the microgrid considered has been established and implemented on real time digital simulator (RTDS). The experimental results validate the simulation results and approve the effectiveness of the proposed controllers to enrich the stability of the considered microgrid.

ACS Style

Mohamed Hassan; Muhammed Y. Worku; Mohamed A. Abido. Optimal Design and Real Time Implementation of Autonomous Microgrid Including Active Load. Energies 2018, 11, 1109 .

AMA Style

Mohamed Hassan, Muhammed Y. Worku, Mohamed A. Abido. Optimal Design and Real Time Implementation of Autonomous Microgrid Including Active Load. Energies. 2018; 11 (5):1109.

Chicago/Turabian Style

Mohamed Hassan; Muhammed Y. Worku; Mohamed A. Abido. 2018. "Optimal Design and Real Time Implementation of Autonomous Microgrid Including Active Load." Energies 11, no. 5: 1109.

Research article electrical engineering
Published: 27 April 2018 in Arabian Journal for Science and Engineering
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This paper proposes an efficient power smoothing and fault ride-through control strategy for variable-speed grid-connected permanent magnet synchronous generator (PMSG)-based wind turbine generator (WTG) with supercapacitor energy storage system (SCESS). As WTG installations are increasing, these systems need to have a fault ride-through capability to stay alive during grid faults. As the wind speed is varying, power smoothing is needed as well. The controller proposed has twofold advantage for WTG equipped with SCESS. That is the SCESS is exploited to minimize the short-term fluctuation to have a smooth power profile during normal operation. In addition during grid side fault, the proposed controller stores the generated power from the WTG into the SCESS to ride-through the fault. Two back-to-back-connected three-level neutral-point-clamped (NPC) converters are used for the power conversion. The system model and the control strategy have been developed for the NPCs, the buck-boost converter and the variable-speed WTG system. The real time digital simulator (RTDS)-based results conducted on 2 MW/4 kV PMSG verify the effectiveness and superiority of the proposed controller.

ACS Style

Muhammed Y. Worku; M. A. Abido. Fault Ride-Through and Power Smoothing Control of PMSG-Based Wind Generation Using Supercapacitor Energy Storage System. Arabian Journal for Science and Engineering 2018, 44, 2067 -2078.

AMA Style

Muhammed Y. Worku, M. A. Abido. Fault Ride-Through and Power Smoothing Control of PMSG-Based Wind Generation Using Supercapacitor Energy Storage System. Arabian Journal for Science and Engineering. 2018; 44 (3):2067-2078.

Chicago/Turabian Style

Muhammed Y. Worku; M. A. Abido. 2018. "Fault Ride-Through and Power Smoothing Control of PMSG-Based Wind Generation Using Supercapacitor Energy Storage System." Arabian Journal for Science and Engineering 44, no. 3: 2067-2078.

Journal article
Published: 18 August 2017 in International Journal of Emerging Electric Power Systems
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This paper proposes an efficient power smoothing control strategy for variable speed grid connected permanent magnet synchronous generator (PMSG) based wind turbine generator (WTG) with supercapacitor energy storage system (SCESS). As WTG installations are increasing, these systems generate a fluctuated output power as a result of varying wind speed and need to have a power smoothing capability to have a smooth output power profile. The optimal size of the SCESS is determined and a controller is proposed and implemented to continuously charge and discharge the SCESS to achieve its objectives. The SCESS is exploited to minimize the short term fluctuation to have a smooth power profile during normal operation. A bi-directional buck boost converter is used to integrate the SCESS with the system. Two back to back connected three level Neutral Point Clamped (NPC) converters are used for the power conversion. The control strategy and the system model have been developed for the NPCs, the buck boost converter and the variable speed WTG system. The Real Time Digital Simulator (RTDS) based results conducted on 2 MW/4 kV PMSG verify the effectiveness and superiority of the proposed controller.

ACS Style

Muhammed Y. Worku. Power Smoothing Control of PMSG Based Wind Generation Using Supercapacitor Energy Storage System. International Journal of Emerging Electric Power Systems 2017, 18, 1 .

AMA Style

Muhammed Y. Worku. Power Smoothing Control of PMSG Based Wind Generation Using Supercapacitor Energy Storage System. International Journal of Emerging Electric Power Systems. 2017; 18 (4):1.

Chicago/Turabian Style

Muhammed Y. Worku. 2017. "Power Smoothing Control of PMSG Based Wind Generation Using Supercapacitor Energy Storage System." International Journal of Emerging Electric Power Systems 18, no. 4: 1.

Journal article
Published: 01 January 2017 in Journal of Renewable and Sustainable Energy
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ACS Style

Muhammed Y. Worku; M. A. Abido; R. Iravani. PMSG based wind system for real-time maximum power generation and low voltage ride through. Journal of Renewable and Sustainable Energy 2017, 9, 013304 .

AMA Style

Muhammed Y. Worku, M. A. Abido, R. Iravani. PMSG based wind system for real-time maximum power generation and low voltage ride through. Journal of Renewable and Sustainable Energy. 2017; 9 (1):013304.

Chicago/Turabian Style

Muhammed Y. Worku; M. A. Abido; R. Iravani. 2017. "PMSG based wind system for real-time maximum power generation and low voltage ride through." Journal of Renewable and Sustainable Energy 9, no. 1: 013304.

Journal article
Published: 01 May 2016 in Renewable Energy and Power Quality Journal
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ACS Style

Muhammed Y. Worku; M.A. Abido. Grid Connected PV System Using ANFIS Based MPPT Controller in Real Time. Renewable Energy and Power Quality Journal 2016, 35 -40.

AMA Style

Muhammed Y. Worku, M.A. Abido. Grid Connected PV System Using ANFIS Based MPPT Controller in Real Time. Renewable Energy and Power Quality Journal. 2016; ():35-40.

Chicago/Turabian Style

Muhammed Y. Worku; M.A. Abido. 2016. "Grid Connected PV System Using ANFIS Based MPPT Controller in Real Time." Renewable Energy and Power Quality Journal , no. : 35-40.

Journal article
Published: 01 January 2016 in Journal of Renewable and Sustainable Energy
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In this paper, an efficient control is proposed and implemented to minimize the power fluctuation of grid connected photovoltaic(PV) with supercapacitor energy storage system (SCESS). The SCESS is used to minimize the power fluctuation caused by changes in temperature and irradiation. The optimal size of the SCESS and its control strategy are developed for continuously charging and discharging SCESS to achieve its objectives. Adaptive Neuro-fuzzy Inference System is developed in real time using dSPACE to generate the maximum power from the PVsystem. The SCESS is integrated with the system through a bi-directional buck boost converter. The system model and the control strategy have been developed in Real Time Digital Simulator (RTDS) that consists of PV array, buck converter, buck-boost converter, and voltage source converter (VSC). To transfer the available DC power to the grid, an independent P-Q control is proposed and implemented for the VSC. The proposed controller is examined through hardware in the loop setup using RTDS and dSPACE 1104 controller. Furthermore, the superiority of the proposed approach has been confirmed by comparing the results with those reported in the literature.

ACS Style

Muhammed Y. Worku; M. A. Abido; R. Iravani. Power fluctuation minimization in grid connected photovoltaic using supercapacitor energy storage system. Journal of Renewable and Sustainable Energy 2016, 8, 013501 .

AMA Style

Muhammed Y. Worku, M. A. Abido, R. Iravani. Power fluctuation minimization in grid connected photovoltaic using supercapacitor energy storage system. Journal of Renewable and Sustainable Energy. 2016; 8 (1):013501.

Chicago/Turabian Style

Muhammed Y. Worku; M. A. Abido; R. Iravani. 2016. "Power fluctuation minimization in grid connected photovoltaic using supercapacitor energy storage system." Journal of Renewable and Sustainable Energy 8, no. 1: 013501.

Journal article
Published: 25 June 2015 in Arabian Journal for Science and Engineering
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In this paper, an efficient adaptive neuro-fuzzy inference system (ANFIS)-based PI controller for maximum power point tracking (MPPT) of photovoltaic (PV) systems is proposed. The proposed ANFIS-based MPPT controller has the capacity to track the optimum point under the rapidly changing irradiation conditions with less fluctuations in steady state. The training data of the proposed controller are extracted from a precise PV model developed. The performance of the proposed controller is compared with the conventional incremental conductance method. Finally, the proposed ANFIS-based MPPT controller has been implemented experimentally using real-time digital simulator (RTDS) to simulate a PV system in real time, while the proposed ANFIS-based controller is implemented on dSPACE 1104 controller. Simulation and experimental results show that the proposed ANFIS-based MPPT controller has fast and accurate dynamic response with less fluctuations in steady state. In addition, its performance is superior as compared to the conventional methods.

ACS Style

M. A. Abido; M. Sheraz Khalid; Muhammed Y. Worku. An Efficient ANFIS-Based PI Controller for Maximum Power Point Tracking of PV Systems. Arabian Journal for Science and Engineering 2015, 40, 2641 -2651.

AMA Style

M. A. Abido, M. Sheraz Khalid, Muhammed Y. Worku. An Efficient ANFIS-Based PI Controller for Maximum Power Point Tracking of PV Systems. Arabian Journal for Science and Engineering. 2015; 40 (9):2641-2651.

Chicago/Turabian Style

M. A. Abido; M. Sheraz Khalid; Muhammed Y. Worku. 2015. "An Efficient ANFIS-Based PI Controller for Maximum Power Point Tracking of PV Systems." Arabian Journal for Science and Engineering 40, no. 9: 2641-2651.