Advanced unified decentralised control method with voltage restoration for DC microgrids

作者：Xia, Yanghong; Peng, Yonggang^*; Hu, Huiyong; Wang, Yu; Wei, Wei

来源：IET Renewable Power Generation, 2016, 10(6): 861-871.

DOI：10.1049/iet-rpg.2015.0433

• distributed power generation
• decentralised control
• power supply quality
• power distribution economics
• load dispatching
• stability
• delays
• power distribution control
• advanced unified decentralised control method
• voltage restoration
• dc microgrids
• grid-connected mode
• islanded mode
• droop control methods
• economic dispatch
• line resistance
• power quality
• communication network
• time-delay theory
• real-time hardware-in-loop tests

This study introduces an advanced decentralised control method for DC microgrids which can be adopted both in the grid-connected mode and the islanded mode with a small change. Compared with the conventional droop control methods, there are three improvements in this proposed control method. First, in the grid-connected mode, the proposed control method can output the specified current, which is useful for the economic dispatch of the microgrid. Second, in the islanded mode, the proposed control method can realise accurate current sharing among distributed generations (DGs). Third, in the islanded mode, the proposed control method can directly restore the average voltage of the bus without the extra secondary control, which can ensure the power quality and reduce the complexity of the control system. The high reliability of the proposed control method is illustrated by the analysis of the stability. Also, the time-delay effect caused by the finite bandwidth of the communication network is analysed and the limited bandwidth of the communication network can be calculated out. All the conclusions are verified by the corresponding simulation tests based on MATLAB/Simulink, also the real-time hardware-in-loop tests are conducted to evaluate the performance of the control method when applied practically.

• 出版日期2016-7
• 单位浙江大学