Distributed coordinated control scheme of parallel DC-DC converters in isolated DC microgrids
DOI：10.19783/j.cnki.pspc.190771
Key Words:isolated DC microgrids  voltage stability  coordinating control scheme  Lyapunov second theorem
Author NameAffiliation
WU Jidong Key Laboratory of Control of Power Transmission and Transformation Shanghai Jiao Tong University, Ministry of Education, Shanghai 200240, China 
WANG Keyou Key Laboratory of Control of Power Transmission and Transformation Shanghai Jiao Tong University, Ministry of Education, Shanghai 200240, China 
HUANG Xin Key Laboratory of Control of Power Transmission and Transformation Shanghai Jiao Tong University, Ministry of Education, Shanghai 200240, China 
QI Chen Key Laboratory of Control of Power Transmission and Transformation Shanghai Jiao Tong University, Ministry of Education, Shanghai 200240, China 
LI Guojie Key Laboratory of Control of Power Transmission and Transformation Shanghai Jiao Tong University, Ministry of Education, Shanghai 200240, China 
ZHANG Yin Electric Power Research Institute of State Grid Shanghai Municipal Electric Power Company, Shanghai 200437, China 
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Abstract:In isolated microgrids, to ensure the stability of power grid operation and the coordination of equipment operation, parallel DC converters are required to both ensure the DC bus voltage stability and maintain the power sharing ratio of each converter at the set proportion. Research indicates that a novel coordinating control scheme based on the Lyapunov second theorem can ensure the stability of the DC bus voltage. By analyzing the power of each converter connecting to the DC bus, the power sharing ratio can be set proportionally according to the user’s command. Analysis shows that under the control scheme, the convergent speed is exponential, which means that the convergence is relatively fast. The research is verified by a Simulink offline simulation and StarSim HIL Pro real-time simulation. The simulation results correspond to the theoretical analysis. This work is supported by National Natural Science Foundation of China (No. 51877133) and Science and Technology Project of State Grid Corporation of China (No. 52094017000Z) “Research on Theory, Design, and Control Technology of Microgrid Novel Operation Mode based on Electric Power Spring”.
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