低压微电网逆变器频率电压协调控制

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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.

Key words： Distributed generation micro-grid inverter control droop control voltage and frequency control

Received: 24 January 2011 Published: 20 March 2014

PACS:

TM761

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2012/V27/I8/77

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