Accurate power control and unified control of converters for microgrid based on local measurement

作者：Mao, Meiqin^*; Shen, Yatao; Dong, Zheng; Shen, Kai; Chang, Liuchen

来源：Automation of Electric Power Systems, 2015, 39(21): 37-45.

DOI：10.7500/AEPS20141202008

• Active and reactive power controls
• Droop control
• Islanding operations
• Micro grid
• Output power controls
• Power compensation
• Voltage compensation
• Voltage source inverter

In a microgrid with multi-microsources, precise output power control and seamless transition of micro-source converters between grid-connected and islanding operation modes are of great significance for the stability of voltage and frequency and the power flow control in a microgrid. The control method of adaptive dual virtual impedances and power compensation conductance based on local voltage and current measurement is proposed, by which active and reactive power control for voltage source inverters (VSIs) can be decoupled and the VSIs can share loads proportionally to their capacity in the islanding mode. Meanwhile, a voltage compensation mechanism is embedded in the droop control, which can refine the power quality in the islanding mode, power control quality in the grid-connected mode, and realize unified control of the microgrid. Furthermore, the parameters of the proposed controller are optimized with small signal models in both grid-connected and islanding modes. Simulation and experiment results have verified the proposed control method.

• 出版日期2015
• 单位合肥工业大学