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[IEEE 2019 22nd International Conference on Electrical Machines and Systems (ICEMS) - Harbin, China (2019.8.11-2019.8.14)] 2019 22nd International Conference on Electrical Machines and Systems (ICEMS) - Seamless Transfer Scheme Based on Unified Control Structure for Single-Stage Photovoltaic Inverter
摘要： The seamless transfer between islanded and grid-connected modes can be achieved by the voltage-type control inverter based on traditional droop control scheme. However, the grid current cannot be controlled directly when the inverter is connected to the grid, which shows that the grid current is easily distorted by the grid voltage harmonics. Moreover, the dynamics of the grid current may be slow under the traditional droop control. To resolve these issues, a novel seamless transfer scheme between two operation modes with unified control structure is proposed in this paper. Simulation results and experimental results are both presented, showing the feasibility of the proposed scheme.
关键词： Droop control,Seamless transfer,Photovoltaic inverter
更新于2025-09-23 15:21:01
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Islanding operation scheme for DC microgrid utilizing pseudo Droop control of photovoltaic system
摘要： The penetration levels of renewable energy sources, energy storage systems, and electric vehicles are increasing with the increase in the demand to solve energy and environmental issues. These distributed generators and energy storages can be efficiently managed in a DC smart grid by coordinated control. This paper proposes novel management schemes for DC systems to improve the reliability of power supply and improve the introduction ratio of renewable energy sources (RES). The proposed DC smart grid includes multiple DC microgrids. These configurations and control systems must be designed on the assumption of islanding operation of DC systems. In the islanding power system with the high penetration of RES, not only the utilization of energy storage but also load shedding and RES control is important. Hence, an efficient control strategy by using a storage battery, fuel cell and electrolyzer units, heat pump units, and a photovoltaic (PV) system is presented for stable islanding operation of DC microgrid. As the most important concept, a pseudo Droop control is proposed that utilizes the characteristics of the PV module. The pseudo Droop control enables the PV system to suppress the output power properly by using a simple control system without the maximum power estimation. Fault ride through protection for DC system is also adapted to the DC distribution lines. The performance of the proposed DC smart grid is demonstrated through MATLAB?/Simscape ElectricalTM simulations. The simulation results show that the DC microgrid can maintain stable islanding operation under the proposed management schemes when faults occur in the DC distribution lines.
关键词： DC smart grid,Fault ride through,Islanding operation,Droop control,Renewable energy,DC microgrid
更新于2025-09-23 15:19:57
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Frequency support from photovoltaic power plants using offline maximum power point tracking and variable droop control
摘要： With higher penetration of converter-connected renewable energy sources (RES) into power systems, the successful operation of the system is challenged by significant reductions in system inertia. Presently, given the dominant share of the conventional synchronous power plant, RES power plants are not demanded to provide ancillary services. However, as RES connections increase, RES power plants will play a major role in power system operation, contributing to frequency control. This study demonstrates that photovoltaic power plants (PVPPs) can provide effectively different types of frequency support based on a power reserve and an offline maximum power point tracking (MPPT) technique. An innovative method to de-load the PVPP without significantly increasing the MPPT complexity is proposed. Results from different PVPP frequency support methods, under varying levels of photovoltaic penetration, are presented which demonstrate their capability to provide inertia support comparable to that of synchronous generators. A new variable droop control method, which releases maximum power during the inertial response and returns to fixed droop gain value after a specified time is also presented. The results from using the variable droop show that the frequency nadir and the rate-of-change-of-frequency can be significantly reduced and some power reserve still maintained after a frequency event.
关键词： variable droop control,offline maximum power point tracking,photovoltaic power plants,system inertia,frequency support,renewable energy sources
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe) - Bucharest, Romania (2019.9.29-2019.10.2)] 2019 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe) - Multi-layer Reactive Power Control of Solar Photovoltaic Systems in MV Distribution Network
摘要： The growing penetration of photovoltaic (PV) systems in distribution networks causes various power quality issues e.g. voltage rise, network losses. To deal with the overvoltage, inverter-based reactive power contribution is one of the most commonly proposed approaches. However, using standard strategies with fixed droop parameters limits the control effectiveness. Moreover, much reactive power absorbed by PVs around noon might increase the network loss, overload the substation consequently, especially in the network with long distribution feeders. In this paper, a combined centralized and local control method is proposed with the suggestion of multi-layer structure. Droop parameters of local control are updated every 15 min by centralized control to minimize reactive power flow through substation while keeping voltages in permitted levels. By avoiding overloading substation, more PV generation can be added to the feeder.
关键词： Reactive power control,droop control,particle swarm optimization,voltage control,photovoltaic (PV) systems
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Chengdu, China (2019.5.21-2019.5.24)] 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Modeling and Simulation of Virtual Synchronous Generator for Photovoltaic Inverter
摘要： The rise of photovoltaic installed capacity brings severe challenges to the safe and stable operation of the power grid. If the grid-connected inverter of the photovoltaic system can simulate the moment of inertia and frequency modulation characteristics of the synchronous generator according to external characteristics, the stability of the photovoltaic system can be improved. Therefore, the virtual synchronous generator control strategy (VSG) is proposed. This paper builds a generic simulation model of current source type photovoltaic inverter based on VSG technology, which can simulate a series of VSG behaviours including virtual inertia control, damping control, primary frequency control, reactive power control and fault ride through. The developed simulation model is also validated comparing to the actual PV power plant testing data, which shows accurate and reliable simulation results. The model of photovoltaic inverter can provide theoretical and model basis for the study of grid-connected stability and grid-connected operational characteristics.
关键词： VSG,photovoltaic inverter,Damping control,Droop control,Microgrid
更新于2025-09-16 10:30:52
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An Experimental Study on Dual P-f Droop Control of Photovoltaic Power Generation for Supporting Grid Frequency Regulation
摘要： The objective of this study is to develop an active power control of photovoltaic power generation (PV) system for supporting grid frequency regulation in two different forms, i.e. slow frequency control contributing to load – frequency control (LFC) and fast frequency control contributing to inertial response of synchronous generators. Two different active power – frequency droop characteristics are implemented simultaneously by using different frequency measurement methods. The performance test result of proposed control using an experimental setup shows that PV system equipped with proposed control can supply appropriate active power according to two different droop characteristics for slow frequency control and fast frequency control.
关键词： inverter,inertial response,Droop control,photovoltaic power generation,frequency control
更新于2025-09-12 10:27:22
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[IEEE 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Chengdu, China (2019.5.21-2019.5.24)] 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Single-stage Grid-connected Photovoltaic Generation Takes Part in Grid Frequency Regulation for Electromechanical Transient Analysis
摘要： In order to solve the problem of insufficient frequency regulation capacity caused by the large-scale grid-connected photovoltaic (PV) generation, the active power-frequency droop control strategy and virtual inertia control strategy are proposed for electromechanical transient analysis. By modifying the control structure of the inverter, PV generation actively got involved in frequency regulation. The simulation results indicate that: the inverter can control the PV array to increase or decrease the active power generated according to the set droop control and virtual inertia control, so as to suppress the drop or rise of the grid frequency; in the dynamic process of frequency, the incremental power of PV generation induced by the dynamic action of the voltage vector of grid connection point is dependent on its virtual inertia control.
关键词： virtual inertia control strategy,frequency regulation,grid-side inverter,single-stage grid-connected photovoltaic generation,droop control strategy
更新于2025-09-12 10:27:22
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[IEEE 2019 IEEE 10th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) - Xi'an, China (2019.6.3-2019.6.6)] 2019 IEEE 10th International Symposium on Power Electronics for Distributed Generation Systems (PEDG) - Analysis of Inertia and Damping Characteristics of Grid-connected Photovoltaic Power Generation System Based on Droop Control
摘要： The grid-connected photovoltaic power generation system (GPPGS) with high proportion of renewable energy has the ability to load balance. A strategy is proposed for GPPGS based on droop control. The electric torque analysis method (ETAM) is used to establish mathematical model of the system with DC voltage timescale (DVT) and analyze the influence law of inertia, damping and synchronization characteristics from the physical mechanism perspective. The research finds that the equivalent inertia, damping and synchronization parameters of the system are determined by the control parameters, structural parameters and steady-state operating point parameters. Changing the control parameters is the simplest and most flexible way to influence the inertia damping and synchronization ability of the system. The inertia characteristics of the system are greatly influenced by the control parameter Kp and enhanced with the increase of Kp. The damping characteristics of the system are obviously affected by the control parameter Dp and weakened with the increase of Dp. The synchronization effect of the system is only controlled by the parameter Ki and enhanced with the increase of Ki. The effectiveness and correctness of the analysis conclusion are verified by simulation.
关键词： droop control,inertia and damping characteristics,DVT,ETAM,GPPGS
更新于2025-09-11 14:15:04