What is it about?
Inertial support for hybrid AC/DC microgrid systems is provided by the virtual synchronous generator (VSG). However, the fast performance of the system is neglected while enhancing the stability of the system. To address this problem, an adaptive virtual inertia control strategy based on VSG technology is proposed. This control approach adaptively adjusts the system virtual inertia when the system operation deviates from the nominal value, by slowing down the rate of change of AC frequency and DC voltage and improving the deviation of AC frequency and DC voltage. Meanwhile, when the AC frequency and DC voltage restore back to the rated value, the rate of change of AC frequency is accelerated and the DC voltage fluctuation is reduced by dynamically adjusting the virtual inertia of the system. The proposed adaptive virtual inertia control method combines the advantages of large and small inertia to effectively improve the dynamic response of the system voltage and frequency in both rectifier and inverter modes. Finally, the simulation and experimental results verify the effectiveness of the proposed control algorithm.
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Why is it important?
The proposed adaptive virtual inertia control method combines the advantages of large and small inertia to effectively improve the dynamic response of the system voltage and frequency in both rectifier and inverter modes.
Perspectives
This paper proposes an adaptive VSG control strategy by combining the effects of rotational inertia J and virtual capacitance Cv on the AC frequency and DC voltage output characteristics to achieve the following improvements through the control of the islanded hybrid microgrid IC. The frequency deviation direction and frequency derivative are considered uniformly, and an equation is proposed to optimize the frequency waveform. When the frequency deviates from the rated value, the system inertia is increased accordingly according to the deviation degree to slow down the frequency deviation and improve the maximum frequency overshoot, and when the frequency restores back to the rated value, the system inertia is reduced accordingly according to the return degree to accelerate the frequency return. The advantages of large inertia and small inertia are combined to improve the regulation performance of the system. Based on the optimized frequency waveform, the voltage waveform is optimized, and the system inertia is increased accordingly to reduce the voltage overshoot when the voltage produces too much overshoot. And the frequency and voltage can be optimized in both rectifier and inverter operation modes. Finally, the feasibility of the proposed strategy is verified by simulation and experimental results, respectively.
xuesong Wang
Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology, Ministry of Education (Northeast Electric Power University), Jilin, Jilin 132012, China
Read the Original
This page is a summary of: An adaptative control strategy for interfacing converter of hybrid microgrid based on improved virtual synchronous generator, IET Renewable Power Generation, October 2021, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/rpg2.12293.
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