Abstract：With the increasing acceptance, micro-grid, combined with distributed generation (DG), may be operated in grid-connected mode or islanding mode. In grid-connected mode, energy management is the main control objectives. While in islanding mode, to maintain voltage and frequency stable is the key point. Taking line impedance into account, PV droop control should be adapted in low voltage system. The PV droop control can share active and reactive power in islanding mode, but it will bring a great offset in voltage and frequency. The article proposes an improved opposite droop control (NPV): By adding feed-forward control to given power, secondary regulation of the voltage and frequency can be achieved. The NPV managed to do the job of both energy management in grid-connected mode and the secondary regulation of voltage and frequency in islanding mode. The results have been validated through simulations by PSCAD software and experiments.
孙孝峰, 吕庆秋. 低压微电网逆变器频率电压协调控制[J]. 电工技术学报, 2012, 27(8): 77-84.
Sun Xiaofeng, Lü Qingqiu. Improved PV Control of Grid-Connected Inverter in Low Voltage Micro-Grid. Transactions of China Electrotechnical Society, 2012, 27(8): 77-84.
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