A linearized modeling method of low voltage hybrid AC and DC distribution system
DOI:10.7667/PSPC180083
Key Words:hybrid AC and DC  distribution power system  interface control  linearized modeling
Author NameAffiliation
CHENG Long School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China 
ZI Shicai Dunhua Pumped Storage Limited Company, State Grid Xinyuan Company Ltd, Dunhua 133700, China 
TANG Kai Synthetic Resin Factory of Jilin Petrifaction Company, China Petroleum, Jilin 132021, China 
WANG Zhenhao School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China 
LI Guoqing School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China 
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Abstract:The linearization model is the basis of stability analysis, interface coupling mechanism research and controller design for DC power system. A radial hybrid AC and DC power distribution system with multiple DC micro-grids is divided into 4 parts, including rectifier interface and the AC main network, inverter interface and the passive AC system, the grid-connected interface and DC micro-grids, and the DC network. The transient mathematical models of each part of the system under small perturbations are respectively deduced through establishing a flexible d-q synchronous reference frame. In order to improve the universality of the model in different application scenarios, a linearized modeling method of the interface controller with control identification bits and the phase locked loop control are introduced to establish a global linear system model. By comparing with the electromagnetic transient model, the correctness and validity of the global linear model of the hybrid AC and DC distribution power system are verified. This work is supported by National Natural Science Foundation of China (No. 51677023).
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