Analysis and application of inertia power compensating of grid-connected distributed generation
DOI：10.19783/j.cnki.pspc.181176
Key Words:distributed generation (DG)  inertia  power decoupling  static inertia compensator (SIC)  frequency stability
Author NameAffiliationE-mail
SHEN Danyu College of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China  
ZHAO Jinbin* College of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China zhaojinbin@shiep.edu.cn 
LI Jixiang College of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China  
QU Keqing College of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China  
LI Fen College of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China  
USHIKI Shuichi Origin Electric Co., Ltd., Sai Yu City 330-6013, Japan  
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Abstract:The Virtual Synchronous Generator (VSG) improves the frequency stability by introducing the inertia, but it is complex and costly compared to the traditional grid connected mode of Distributed Generation (DG). Its inertia setting is also dispersed. So this paper studies how to increase the virtual inertia in the distributed generation grid connected system more easily and economically. Firstly, this paper analyzes the transient response process of VSG and decomposes the rotor inertia power through the power decoupling. Secondly, based on the characteristics of the rotor inertia power response and the running characteristics of the super capacitor, referring to Static Var Compensator (SVC), the concept of Static Inertia Compensator (SIC) is proposed. Lastly, the simulation model of the static inertia compensator is built in Matlab/Simulink to verify the effectiveness of the proposed idea. The results show that SIC can provide inertia power to the node by detecting the frequency variation. It can improve the inertia of the system and enhance the frequency stability of the system and achieve the effect of frequency stabilization of VSG. This work is supported by National Natural Science Foundation of China (No. 51777120).
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