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Dr. Saeed Peyghami
Department of Energy Technology, Aalborg University, 9220 Aalborg, Denmark

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Research Keywords & Expertise

0 Power Electronics
0 Power Systems
0 Renewable energies
0 Electrical Power Engineering
0 Reliability, control and stability

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Power Electronics
Renewable energies

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Original research paper
Published: 16 July 2021 in IET Energy Systems Integration
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The transition to renewable energy-based power systems is fast progressing. One of the main challenges in keeping a power system with high operational reliability is to maintain the system frequency. As synchronous generator units are being replaced with power-electronic converters, the rotating mass and the system inertia are decreasing. Virtual synchronous machine (VSM) control is a modern control technique that aims to compensate for the reduction in inertia. The usage of power electronic-based converter units equipped with VSM control has to be managed and scheduled by system operators. An assessment of the operational frequency reliability is used to evaluate different service usages. A method is proposed that allows the comparison of different frequency management strategies. The proposed method uses fuzzy logic to evaluate the system risk for abnormal frequency and the system effort in the form of frequency control usage. This allows to quickly compare different frequency management strategies whilst keeping in mind many different reliability indices. The proposed method is validated with a modified IEEE Reliability Test System with integrated wind power capacity.

ACS Style

Joachim Steinkohl; Saeed Peyghami; Xiongfei Wang; Pooya Davari; Frede Blaabjerg. Fuzzy‐based frequency security evaluation of wind‐integrated power systems. IET Energy Systems Integration 2021, 1 .

AMA Style

Joachim Steinkohl, Saeed Peyghami, Xiongfei Wang, Pooya Davari, Frede Blaabjerg. Fuzzy‐based frequency security evaluation of wind‐integrated power systems. IET Energy Systems Integration. 2021; ():1.

Chicago/Turabian Style

Joachim Steinkohl; Saeed Peyghami; Xiongfei Wang; Pooya Davari; Frede Blaabjerg. 2021. "Fuzzy‐based frequency security evaluation of wind‐integrated power systems." IET Energy Systems Integration , no. : 1.

Journal article
Published: 06 July 2021 in Applied Sciences
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This paper proposes a nonlinear decoupled current control scheme for a grid-connected inverter with LCL filter. Decoupling the active and reactive current control channels is one of the main demands in the control of inverters. For inverters with an L filter, the decoupling can be achieved by a proper feed-forward of grid voltages. However, the coupling of channels is a complex issue for converters with LCL filters. The resonance mode of the LCL filter may cause instability, which adds more complexity to the analysis. In this paper, state equations of the system are provided, which highlight the coupling between active and reactive currents injected into the grid. Accordingly, a non-linear control scheme is proposed which effectively decouples the channels and dampens the resonant modes of the LCL filter. The stability of the proposed control method is verified by the Lyapunov criterion. Independency of the system stability to the grid-impedance is another feature of the proposed approach. Moreover, only grid-side currents are needed for implementation of the proposed scheme, avoiding the need for additional current sensors for the output capacitor and grid-side inductor. For accurate modelling of the inverter, the computation and PWM sampling delays are included in the controller design. Finally, various case studies are provided that verify the performance of the proposed approach and the stability of the system.

ACS Style

Mohamad Ghasemi; Seyed Zarei; Saeed Peyghami; Frede Blaabjerg. A Theoretical Concept of Decoupled Current Control Scheme for Grid-Connected Inverter with L-C-L Filter. Applied Sciences 2021, 11, 6256 .

AMA Style

Mohamad Ghasemi, Seyed Zarei, Saeed Peyghami, Frede Blaabjerg. A Theoretical Concept of Decoupled Current Control Scheme for Grid-Connected Inverter with L-C-L Filter. Applied Sciences. 2021; 11 (14):6256.

Chicago/Turabian Style

Mohamad Ghasemi; Seyed Zarei; Saeed Peyghami; Frede Blaabjerg. 2021. "A Theoretical Concept of Decoupled Current Control Scheme for Grid-Connected Inverter with L-C-L Filter." Applied Sciences 11, no. 14: 6256.

Original research paper
Published: 02 May 2021 in IET Renewable Power Generation
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Power grids with high integration of power electronic converters face new issues that have not existed before. The frequency in the power system is highly related to the inertia and the rotational speed of the operational synchronous machines. This is now changing, as the converter‐based generation units are contributing increasingly to the balancing of active power in the modern power grid. Several frequency control designs for the power electronic‐based generation units have been presented in the past. However, optimal control structures and settings are dependent on the current power grid parameters and operation. The converter‐based units allow the transmission system operators to change their behaviour according to their grid requirements much more dynamical than ever before. The paper proposes a new analysis framework that can be utilized to find the best‐suited control settings in converter‐based units to enhance the system frequency reliability. The proposed framework is demonstrated in a study case by varying the settings of one frequency control scheme currently used in wind power plants in the Danish grid codes and validated on the IEEE 24‐Bus reliability test system with additional wind power integration.

ACS Style

Joachim Steinkohl; Saeed Peyghami; Xiongfei Wang; Pooya Davari; Frede Blaabjerg. Frequency security constrained control of power electronic‐based generation systems. IET Renewable Power Generation 2021, 1 .

AMA Style

Joachim Steinkohl, Saeed Peyghami, Xiongfei Wang, Pooya Davari, Frede Blaabjerg. Frequency security constrained control of power electronic‐based generation systems. IET Renewable Power Generation. 2021; ():1.

Chicago/Turabian Style

Joachim Steinkohl; Saeed Peyghami; Xiongfei Wang; Pooya Davari; Frede Blaabjerg. 2021. "Frequency security constrained control of power electronic‐based generation systems." IET Renewable Power Generation , no. : 1.

Journal article
Published: 06 April 2021 in Scientific Reports
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This paper proposes a long-term performance indicator for power electronic converters based on their reliability. The converter reliability is represented by the proposed constant lifetime curves, which have been developed using Artificial Neural Network (ANN) under different operating conditions. Unlike the state-of-the-art theoretical reliability modeling approaches, which employ detailed electro-thermal characteristics and lifetime models of converter components, the proposed method provides a nonparametric surrogate model of the converter based on limited non-linear data from theoretical reliability analysis. The proposed approach can quickly predict the converter lifetime under given operating conditions without a further need for extended, time-consuming electro-thermal analysis. Moreover, the proposed lifetime curves can present the long-term performance of converters facilitating optimal system-level design for reliability, reliable operation and maintenance planning in power electronic systems. Numerical case studies evaluate the effectiveness of the proposed reliability modeling approach.

ACS Style

Saeed Peyghami; Tomislav Dragicevic; Frede Blaabjerg. Intelligent long-term performance analysis in power electronics systems. Scientific Reports 2021, 11, 1 -18.

AMA Style

Saeed Peyghami, Tomislav Dragicevic, Frede Blaabjerg. Intelligent long-term performance analysis in power electronics systems. Scientific Reports. 2021; 11 (1):1-18.

Chicago/Turabian Style

Saeed Peyghami; Tomislav Dragicevic; Frede Blaabjerg. 2021. "Intelligent long-term performance analysis in power electronics systems." Scientific Reports 11, no. 1: 1-18.

Journal article
Published: 28 January 2021 in IEEE Access
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In recent years, utilizing the electrical propulsion system in the marine industry has become widely popular. Control of the propeller has been a high-priority design challenge in this industry. One of the essential issues in propeller control is the speed control of the ships. A suitable control strategy for the propeller should be economically-efficient while ensuring stability, reliability, and power quality of the ship’s power system. This article proposes an improved propeller control strategy for increasing/decreasing the ship’s speed. This scheme consists of two strategies: a maximum acceleration strategy and an efficient operation strategy. The maximum acceleration strategy aims to quickly reach the final speed setpoint. On the other hand, the efficient operation strategy is deemed to increase the reliability and power quality of the ship power system, as well as having a slightly more acceleration than the conventional method. Moreover, a mechanical index is employed for comparing the performance of the various speed change strategies. By utilizing this index, which is known as loss of life (LoL), the effects of a speed change maneuver on the propeller shaft fatigue are analyzed and the advantage of the proposed method in enhancing the propeller lifespan is discussed. Simulations show that utilizing the proposed speed change scheme decreases the propeller mechanical wear and tear to about 1.8 percent of the conventional methods and consequently will increase its lifespan.

ACS Style

Saman Nasiri; Saeed Peyghami; Mostafa Parniani; Frede Blaabjerg. An Open-Water Efficiency Based Speed Change Strategy With Propeller Lifespan Enhancement in All-Electric Ships. IEEE Access 2021, 9, 22595 -22604.

AMA Style

Saman Nasiri, Saeed Peyghami, Mostafa Parniani, Frede Blaabjerg. An Open-Water Efficiency Based Speed Change Strategy With Propeller Lifespan Enhancement in All-Electric Ships. IEEE Access. 2021; 9 ():22595-22604.

Chicago/Turabian Style

Saman Nasiri; Saeed Peyghami; Mostafa Parniani; Frede Blaabjerg. 2021. "An Open-Water Efficiency Based Speed Change Strategy With Propeller Lifespan Enhancement in All-Electric Ships." IEEE Access 9, no. : 22595-22604.

Journal article
Published: 27 November 2020 in IEEE Transactions on Power Electronics
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Microgrid (MG) technologies facilitate reliable, efficient and economic operation of distributed resources such as photovoltaic (PV) and battery storage systems. The well-known droop method controls different sources in a MG to properly share power supply. However, utilizing the droop method poses two major challenges. Firstly, while the droop method can prevent converter over-loading, it cannot protect them from over-stressing, thus deteriorating system reliability. Secondly, operating a 100% renewable-based MG requires a supervisory unit to monitor and control energy flow for load-generation balance. However, the supervisory unit relies on communication systems which impacts overall system reliability by being exposed to single-point failures and cyber-attacks. This paper proposes a decentralized power sharing approach that restricts thermal damage of converter components to avoid over-stressing converters. The main goal is to improve overall system performance and reliability by appropriately sharing active and reactive power among different sources without using communication systems. The simulations and numerical analysis show that the proposed decentralized strategy will properly control the power and energy flow among different sources. Moreover, it prevents over-stressing converters, consequently enhancing the overall reliability of the MG. An experiment is also presented to demonstrate the effectiveness of the proposed decentralized control approach.

ACS Style

Jiahui Jiang; Saeed Peyghami; Colin Coates; Frede Blaabjerg. A Decentralized Reliability-Enhanced Power Sharing Strategy for PV-Based Microgrids. IEEE Transactions on Power Electronics 2020, 36, 7281 -7293.

AMA Style

Jiahui Jiang, Saeed Peyghami, Colin Coates, Frede Blaabjerg. A Decentralized Reliability-Enhanced Power Sharing Strategy for PV-Based Microgrids. IEEE Transactions on Power Electronics. 2020; 36 (6):7281-7293.

Chicago/Turabian Style

Jiahui Jiang; Saeed Peyghami; Colin Coates; Frede Blaabjerg. 2020. "A Decentralized Reliability-Enhanced Power Sharing Strategy for PV-Based Microgrids." IEEE Transactions on Power Electronics 36, no. 6: 7281-7293.

Conference paper
Published: 09 November 2020 in 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL)
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Conventional half-bridge based three-phase inverter (HB-TPI) and neutral-point-clamped inverters (NPC) are popular in industry. Nevertheless, they suffer from the buck characteristics. To tackle the issue, this paper proposes a new full-bridge-based inverter topology which is able to develop a stepped ac voltage with low voltage stress across the components. Since the inverter side of the proposed inverter is based on switched capacitor, it is integrated with a front-end dc- dc converter to further increase the voltage gain and avoid inrush current. Simulation results are provided to validate the feasibility and effectiveness of the proposed inverter.

ACS Style

Hossein Khoun Jahan; Roghayyeh Pourebrahim; Sajjad Tohidi; Saeed Peyghami; Amin Mohammadpour Shotorbani; Frede Blaabjerg. Two-Stage Single-Source Full-Bridge Based Three- Phase Inverter for Medium Voltage Applications. 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL) 2020, 1 -6.

AMA Style

Hossein Khoun Jahan, Roghayyeh Pourebrahim, Sajjad Tohidi, Saeed Peyghami, Amin Mohammadpour Shotorbani, Frede Blaabjerg. Two-Stage Single-Source Full-Bridge Based Three- Phase Inverter for Medium Voltage Applications. 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL). 2020; ():1-6.

Chicago/Turabian Style

Hossein Khoun Jahan; Roghayyeh Pourebrahim; Sajjad Tohidi; Saeed Peyghami; Amin Mohammadpour Shotorbani; Frede Blaabjerg. 2020. "Two-Stage Single-Source Full-Bridge Based Three- Phase Inverter for Medium Voltage Applications." 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL) , no. : 1-6.

Conference paper
Published: 09 November 2020 in 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL)
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This study proposes an asymmetric multilevel inverter (MI) entitled as the Asymmetric Cascaded Half-bridge MI (ACHB-MI). The proposed ACHB-MI is structured by cascading multiple capacitor-based half-bridge cells with nonequal dc sources and one ancillary cell. A half-bridge cell can only develop a specific voltage level with either a negative or positive polarity, and thus the cascaded half bridge cells can generate certain odd or even voltage levels. Consequently, an ancillary cell is added to generate the entire needed negative, positive and zero voltage levels. The proposed ACHB-MI reduces the total number of switches, the conduction power loss, and the cost. The performance and feasibility of the proposed ACHB-MI are approved through simulation and experimental verification.

ACS Style

Reyhaneh Eskandari; Hossein Khoun Jahan; Amin Mohammadpour Shotorbani; Mehdi Abapour; Saeed Peyghami; Frede Blaabjerg. Asymmetric Cascaded Multilevel Inverter with Capacitor-based Half-bridge Cells and Reduced Number of Components. 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL) 2020, 1 -6.

AMA Style

Reyhaneh Eskandari, Hossein Khoun Jahan, Amin Mohammadpour Shotorbani, Mehdi Abapour, Saeed Peyghami, Frede Blaabjerg. Asymmetric Cascaded Multilevel Inverter with Capacitor-based Half-bridge Cells and Reduced Number of Components. 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL). 2020; ():1-6.

Chicago/Turabian Style

Reyhaneh Eskandari; Hossein Khoun Jahan; Amin Mohammadpour Shotorbani; Mehdi Abapour; Saeed Peyghami; Frede Blaabjerg. 2020. "Asymmetric Cascaded Multilevel Inverter with Capacitor-based Half-bridge Cells and Reduced Number of Components." 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL) , no. : 1-6.

Conference paper
Published: 09 November 2020 in 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL)
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Microgrids (MGs) are becoming active segments of future power systems. Frequency regulation in islanded MGs is of high importance to guarantee stable and reliable operation under different loading conditions. This paper proposes a decentralized frequency regulation of AC MGs, which relies on the local information. Comparing to the conventional approaches, the proposed scheme does not require a communication system for frequency regulation, resulting in higher reliability and lower costs. Simulation results verify the effectiveness of the proposed frequency control strategy.

ACS Style

Saeed Peyghami; Seyed Fariborz Zarei; Mohammad Amin Ghasemi; Peter Palensky; Frede Blaabjerg. A Decentralized Frequency Regulation Scheme in AC Microgrids. 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL) 2020, 1 -5.

AMA Style

Saeed Peyghami, Seyed Fariborz Zarei, Mohammad Amin Ghasemi, Peter Palensky, Frede Blaabjerg. A Decentralized Frequency Regulation Scheme in AC Microgrids. 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL). 2020; ():1-5.

Chicago/Turabian Style

Saeed Peyghami; Seyed Fariborz Zarei; Mohammad Amin Ghasemi; Peter Palensky; Frede Blaabjerg. 2020. "A Decentralized Frequency Regulation Scheme in AC Microgrids." 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL) , no. : 1-5.

Conference paper
Published: 09 November 2020 in 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL)
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This paper proposes a new adaptive droop curve to ensure the stability of the superimposed frequency method (SFM) for the control of DC Microgrids. SFM has a remarkable accuracy in load-sharing and voltage regulations among different control strategies of DC microgrids. However, this method suffers from some levels of instability in terms of the load variations. This is due to (i) location of the system dominant poles; which is really sensitive to the variations of the system loading, and (ii) limitations in the transferred reactive power; which is used to regulate source DC voltages. Therefore, a new strategy based on an adaptive droop curve is presented in this paper to keep the system dominant poles in an acceptable area and its performance is verified using different simulation studies in MATLAB/SIMULINK environment.

ACS Style

Mohammad Jafari Matehkolaei; Saeed Peyghami; Hosein Mokhtari; Frede Blaabjerg. An Adaptive droop Curve for the Superimposed Frequency Method in DC Microgrids. 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL) 2020, 1 -6.

AMA Style

Mohammad Jafari Matehkolaei, Saeed Peyghami, Hosein Mokhtari, Frede Blaabjerg. An Adaptive droop Curve for the Superimposed Frequency Method in DC Microgrids. 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL). 2020; ():1-6.

Chicago/Turabian Style

Mohammad Jafari Matehkolaei; Saeed Peyghami; Hosein Mokhtari; Frede Blaabjerg. 2020. "An Adaptive droop Curve for the Superimposed Frequency Method in DC Microgrids." 2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL) , no. : 1-6.

Conference paper
Published: 02 November 2020 in 2020 5th IEEE Workshop on the Electronic Grid (eGRID)
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Power Electronic (PE) converters are the heart of modern wind turbine systems, and their failures can significantly reduce turbine energy production. On the other hand, preventive maintenance, e.g., replacement of the components after a certain age, is an effective way to limit the converter unreliability. With that, this paper proposes an approach to find the optimal replacement time of components by quantifying and minimizing the total costs. The proposed framework is demonstrated on a 2-MW wind turbine system, where the outcomes are compared with Monte Carlo simulation results. Several factors are considered in this maintenance planning approach. By performing a sensitivity analysis, among them, repair rate, random-chance failure rate, scale parameter of the wear-out failure distribution, and the average price of electricity are identified as the key factors.

ACS Style

Amirali Davoodi; Saeed Peyghami; Yongheng Yang; Tomislav Dragicevic; Frede Blaabjerg. A Preventive Maintenance Planning Approach for Wind Converters. 2020 5th IEEE Workshop on the Electronic Grid (eGRID) 2020, 1 -8.

AMA Style

Amirali Davoodi, Saeed Peyghami, Yongheng Yang, Tomislav Dragicevic, Frede Blaabjerg. A Preventive Maintenance Planning Approach for Wind Converters. 2020 5th IEEE Workshop on the Electronic Grid (eGRID). 2020; ():1-8.

Chicago/Turabian Style

Amirali Davoodi; Saeed Peyghami; Yongheng Yang; Tomislav Dragicevic; Frede Blaabjerg. 2020. "A Preventive Maintenance Planning Approach for Wind Converters." 2020 5th IEEE Workshop on the Electronic Grid (eGRID) , no. : 1-8.

Conference paper
Published: 02 November 2020 in 2020 5th IEEE Workshop on the Electronic Grid (eGRID)
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Power electronics are becoming an underpinning technology for development of future electric energy systems. Proliferation of power converters will affect the dynamic and static performance of power systems. Thus, design, planning and operation of power systems should take into account the converter dynamics and also static models. Moreover, control, design and manufacturing of converters require considering their interactions with the entire power system performance. This paper highlights the importance of bridging power electronics and power system engineering concepts in future power systems. First, different concepts of power electronics and power system engineering is discussed. Afterwards, the necessity for bridging these two areas are explained. Finally, numerical case studies on a DC microgrid are provided for illustrating the needs for bridging these concepts.

ACS Style

Saeed Peyghami; Frede Blaabjerg. Demands for Bridging Power Electronics and Power System Engineering Concepts. 2020 5th IEEE Workshop on the Electronic Grid (eGRID) 2020, 1 -8.

AMA Style

Saeed Peyghami, Frede Blaabjerg. Demands for Bridging Power Electronics and Power System Engineering Concepts. 2020 5th IEEE Workshop on the Electronic Grid (eGRID). 2020; ():1-8.

Chicago/Turabian Style

Saeed Peyghami; Frede Blaabjerg. 2020. "Demands for Bridging Power Electronics and Power System Engineering Concepts." 2020 5th IEEE Workshop on the Electronic Grid (eGRID) , no. : 1-8.

Journal article
Published: 13 October 2020 in IEEE Transactions on Power Electronics
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A new single-carrier sensor-less pulse-width modulation (PWM) method using suggested pseudo reference functions is proposed for packed U-cell (PUC) converter to improve performance and reliability of the PUC converter. It is comprised of one PWM carrier signal, and two suggested pseudo reference functions. By employing the proposed modulation method, the PUC dc capacitor voltage ripple is substantially decreased, and faster sensor-less capacitor voltage balancing is obtained. Moreover, the power losses are evenly distributed among all power switches. Consequently, notable reduction of the PUC dc capacitor voltage ripple and even distribution of the power loss among switches enhance the PUC converter reliability and lifetime. In addition, odd multiples of the switching harmonic clusters are eliminated from the output voltage, thus, the values of output passive filter components are halved. Hence, applying the proposed single-carrier sensor-less PWM method remarkably improves the performance, power density, reliability, and lifetime of the PUC converter and notably simplifies implementation of the switching pattern. Provided experimental results and comparisons as well as reliability analysis verify the viability and effectiveness of the proposed PWM method.

ACS Style

Mostafa Abarzadeh; Saeed Peyghami; Kamal Al-Haddad; Nathan Weise; Liuchen Chang; Frede Blaabjerg. Reliability and Performance Improvement of PUC Converter Using a New Single-Carrier Sensor-Less PWM Method With Pseudo Reference Functions. IEEE Transactions on Power Electronics 2020, 36, 6092 -6105.

AMA Style

Mostafa Abarzadeh, Saeed Peyghami, Kamal Al-Haddad, Nathan Weise, Liuchen Chang, Frede Blaabjerg. Reliability and Performance Improvement of PUC Converter Using a New Single-Carrier Sensor-Less PWM Method With Pseudo Reference Functions. IEEE Transactions on Power Electronics. 2020; 36 (5):6092-6105.

Chicago/Turabian Style

Mostafa Abarzadeh; Saeed Peyghami; Kamal Al-Haddad; Nathan Weise; Liuchen Chang; Frede Blaabjerg. 2020. "Reliability and Performance Improvement of PUC Converter Using a New Single-Carrier Sensor-Less PWM Method With Pseudo Reference Functions." IEEE Transactions on Power Electronics 36, no. 5: 6092-6105.

Journal article
Published: 06 October 2020 in IEEE Open Access Journal of Power and Energy
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ACS Style

Saeed Peyghami; Peter Palensky; Mahmoud Fotuhi-Firuzabad; Frede Blaabjerg. System-Level Design for Reliability and Maintenance Scheduling in Modern Power Electronic-Based Power Systems. IEEE Open Access Journal of Power and Energy 2020, 7, 414 -429.

AMA Style

Saeed Peyghami, Peter Palensky, Mahmoud Fotuhi-Firuzabad, Frede Blaabjerg. System-Level Design for Reliability and Maintenance Scheduling in Modern Power Electronic-Based Power Systems. IEEE Open Access Journal of Power and Energy. 2020; 7 ():414-429.

Chicago/Turabian Style

Saeed Peyghami; Peter Palensky; Mahmoud Fotuhi-Firuzabad; Frede Blaabjerg. 2020. "System-Level Design for Reliability and Maintenance Scheduling in Modern Power Electronic-Based Power Systems." IEEE Open Access Journal of Power and Energy 7, no. : 414-429.

Conference paper
Published: 28 September 2020 in 2020 IEEE 11th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)
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In this paper, analytical equations are employed for electro-thermal modelling of a PhotoVoltaic (PV) inverter. This approach results in significantly faster reliability modelling, which is suitable for iterative design and analysis of large-scale systems. Next, considering the mission profiles, reliability metrics of the inverter are extracted for a case study system. Afterwards, the system reliability performance is characterized in terms of input power, switching frequency, and DC-link voltage of the inverter. Subsequently, by using this information, solutions are proposed to improve the inverter reliability and meet the intended requirements. In addition, the impact of the grid on inverter reliability is discussed.

ACS Style

Amirali Davoodi; Saeed Peyghami; Yongheng Yang; Tomislav Dragicevic; Frede Blaabjerg. Modelling and Analysis of the Reliability of a PhotoVoltaic (PV) Inverter. 2020 IEEE 11th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) 2020, 297 -303.

AMA Style

Amirali Davoodi, Saeed Peyghami, Yongheng Yang, Tomislav Dragicevic, Frede Blaabjerg. Modelling and Analysis of the Reliability of a PhotoVoltaic (PV) Inverter. 2020 IEEE 11th International Symposium on Power Electronics for Distributed Generation Systems (PEDG). 2020; ():297-303.

Chicago/Turabian Style

Amirali Davoodi; Saeed Peyghami; Yongheng Yang; Tomislav Dragicevic; Frede Blaabjerg. 2020. "Modelling and Analysis of the Reliability of a PhotoVoltaic (PV) Inverter." 2020 IEEE 11th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) , no. : 297-303.

Conference paper
Published: 01 September 2020 in 2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)
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ACS Style

Saeed Peyghami; Frede Blaabjerg; Jose Rueda Torres; Peter Palensky. Maintenance Scheduling in Power Electronic Converters Considering Wear-out Failures. 2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe) 2020, 1 .

AMA Style

Saeed Peyghami, Frede Blaabjerg, Jose Rueda Torres, Peter Palensky. Maintenance Scheduling in Power Electronic Converters Considering Wear-out Failures. 2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe). 2020; ():1.

Chicago/Turabian Style

Saeed Peyghami; Frede Blaabjerg; Jose Rueda Torres; Peter Palensky. 2020. "Maintenance Scheduling in Power Electronic Converters Considering Wear-out Failures." 2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe) , no. : 1.

Conference paper
Published: 01 September 2020 in 2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)
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ACS Style

Silpa Baburajan; Saeed Peyghami; Dinesh Kumar; Frede Blaabjerg; Pooya Davari. Effect of Unipolar and Bipolar SPWM on the Lifetime of DC-link Capacitors in Single-Phase Voltage Source Inverters. 2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe) 2020, 1 .

AMA Style

Silpa Baburajan, Saeed Peyghami, Dinesh Kumar, Frede Blaabjerg, Pooya Davari. Effect of Unipolar and Bipolar SPWM on the Lifetime of DC-link Capacitors in Single-Phase Voltage Source Inverters. 2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe). 2020; ():1.

Chicago/Turabian Style

Silpa Baburajan; Saeed Peyghami; Dinesh Kumar; Frede Blaabjerg; Pooya Davari. 2020. "Effect of Unipolar and Bipolar SPWM on the Lifetime of DC-link Capacitors in Single-Phase Voltage Source Inverters." 2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe) , no. : 1.

Journal article
Published: 21 August 2020 in IEEE Transactions on Energy Conversion
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Power electronic converters are increasingly used in power sys-tems. However, they are vulnerable components and prone to aging failures, thus affecting overall system reliability. Therefore, their availability modeling especially in large-scale power electron-ic-based power systems is of paramount importance. This letter introduces four different approaches for converter availability modeling considering aging failures under different maintenance strategies. The accuracy and calculation burden of these ap-proaches are illustrated by numerical analysis. It is shown that the method of device of stages and piece-wise approach are the most applicable methods in the case of corrective and preventive maintenance strategies respectively.

ACS Style

Saeed Peyghami; Frede Blaabjerg. Availability Modeling in Power Converters Considering Components Aging. IEEE Transactions on Energy Conversion 2020, 35, 1981 -1984.

AMA Style

Saeed Peyghami, Frede Blaabjerg. Availability Modeling in Power Converters Considering Components Aging. IEEE Transactions on Energy Conversion. 2020; 35 (4):1981-1984.

Chicago/Turabian Style

Saeed Peyghami; Frede Blaabjerg. 2020. "Availability Modeling in Power Converters Considering Components Aging." IEEE Transactions on Energy Conversion 35, no. 4: 1981-1984.

Journal article
Published: 03 May 2020 in Applied Sciences
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By the increase of the penetration of power-electronic-based (PE-based) units, such as wind turbines and PV systems, many features of those power systems, such as stability, security, and protection, have been changed. In this paper, the security of electrical grids with high wind turbines penetration is discussed. To do so, first, an overview of the power systems’ security assessment is presented. Based on that, stability and security challenges introduced by increasing the penetration of wind turbines in power systems are studied, and a new guideline for the security assessment of the PE-based power systems is proposed. Simulation results for the IEEE 39-bus test system show that the proposed security guideline is necessary for PE-based power systems, as the conventional security assessments may not be able to indicate its security status properly.

ACS Style

Bahram Shakerighadi; Saeed Peyghami; Esmaeil Ebrahimzadeh; Frede Blaabjerg; Claus Leth Back. A New Guideline for Security Assessment of Power Systems with a High Penetration of Wind Turbines. Applied Sciences 2020, 10, 3190 .

AMA Style

Bahram Shakerighadi, Saeed Peyghami, Esmaeil Ebrahimzadeh, Frede Blaabjerg, Claus Leth Back. A New Guideline for Security Assessment of Power Systems with a High Penetration of Wind Turbines. Applied Sciences. 2020; 10 (9):3190.

Chicago/Turabian Style

Bahram Shakerighadi; Saeed Peyghami; Esmaeil Ebrahimzadeh; Frede Blaabjerg; Claus Leth Back. 2020. "A New Guideline for Security Assessment of Power Systems with a High Penetration of Wind Turbines." Applied Sciences 10, no. 9: 3190.

Journal article
Published: 19 March 2020 in IEEE Transactions on Power Electronics
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Reliability prediction in power electronic converters is of paramount importance for converter manufacturers and operators. Conventional approaches employ generic data provided in handbooks for random chance failure probability prediction within useful lifetime. However, the wear-out failures affect the long-term performance of the converters. Therefore, this paper proposes a comprehensive approach for estimating the converter reliability within useful lifetime and wear-out period. Moreover, this paper proposes a wear-out failure prediction approach based on a structural reliability concept. The proposed approach can quickly predict the converter wear-out behavior unlike conventional Monte Carlo based techniques. Hence, it facilitates reliability modeling and evaluation in large-scale power electronic based power systems with huge number of components. The proposed comprehensive failure function over the useful lifetime and wear-out phase can be used for optimal design and manufacturing by identifying the failure prone components and end-of-life prediction. Moreover, the proposed reliability model can be used for optimal decision-making in design, planning, operation and maintenance of modern power electronic based power systems. The proposed methodology is exemplified for a photovoltaic inverter by predicting its failure characteristics.

ACS Style

Saeed Peyghami; Zhongxu Wang; Frede Blaabjerg. A Guideline for Reliability Prediction in Power Electronic Converters. IEEE Transactions on Power Electronics 2020, 35, 10958 -10968.

AMA Style

Saeed Peyghami, Zhongxu Wang, Frede Blaabjerg. A Guideline for Reliability Prediction in Power Electronic Converters. IEEE Transactions on Power Electronics. 2020; 35 (10):10958-10968.

Chicago/Turabian Style

Saeed Peyghami; Zhongxu Wang; Frede Blaabjerg. 2020. "A Guideline for Reliability Prediction in Power Electronic Converters." IEEE Transactions on Power Electronics 35, no. 10: 10958-10968.