包含同步发电机及电压源逆变器接口的微网控制策略

Control Scheme of Microgrid Fed by Synchronous Generator and Voltage Source Inverter

分布式电源(distributed generator,DG)并网接口方式有同步发电机组(synchronous generators,SG)接口和电压源逆变器(voltage source inverter,VSI)接口2类,文中提出了包含2种接口方式的微网控制策略。具有SG接口的DG通过其输出的有功功率和无功功率分别对微网的频率和电压进行下垂控制,具有VSI接口的DG通过输出电流的d、q分量分别对微网的频率和电压进行下垂控制。该控制策略可实现微网由联网运行模式向孤岛运行模式的平滑转换,并能够实现功率共享。具有SG接口的DG配置潜遗传变论域模糊控制电力系统稳定器后,可提高微网稳定性。仿真算例验证了该控制策略的有效性。

There are two grid-connecting modes for distributed generation （DG）, namely synchronous generator （SG） grid-connecting mode and voltage source inverter （VSI） grid-connecting mode. A control scheme for micro-grid that contains both grid-connecting modes is proposed. The DG with SG grid-connecting mode respectively performs droop control to frequency and voltage of microgrid by its output active and reactive power; the DG with VSI grid-connecting mode respectively performs droop control to frequency and voltage of microgrid by the d-q components of output current. The proposed control scheme can smoothly transit the operation mode of rnicrogrid from grid-connected operation mode to islanded operation mode, and an inverter can share common load not only with other inverters but also with SGs in islanded mode. Configuring with power system stabilizer based on potential-heredity variable-universe fuzzy control, the stability of microgrid can he improved by DG with SG grid-connecting mode. The effectiveness of the proposed control scheme is verified by simulation results.