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Abstract
Due to the constant power loads (CPLs), the system damping of the DC microgrid is reduced, which will lead to the collapse of bus voltage. In addition, the errors of current sharing amplify due to different line impedances. To address these issues, a hybrid coordination control strategy is proposed for parallel-connected boost converters, which realizes stable control and maintains the accuracy of the current distribution. Firstly, a passivity-based control (PBC) with a proportional-integral (PI) regulator is developed. The virtual damping-based PBC enhances the system damping and the PI regulator eliminates errors. On this basis, a secondary voltage control (SVC) featuring simplicity and weak dependence on communication is introduced to remove the errors of current distribution. Finally, the hybrid coordination control strategy is verified by RT-LAB-based hardware in the loop (HIL) experiment.
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Details
1 State Grid Zhejiang Electric Power Co., Ltd. Deqing Power Supply Company , Zhejiang, 313200 China
2 Deqing Xindian Electric Power Construction Company , Zhejiang, 313200 China
3 NARI Nanjing Control System Co., Lid. , Jiangsu, 211100 China