提高暂态响应的微网孤岛模式下新型功率均分控制策略

A new power sharing control strategy for improving the transient response in islanded microgrids

孤岛模式下,微网中并联的逆变器通常采用功率均分的下垂控制策略,但该策略暂态响应较慢。文章针对此问题,设计了一种新型控制策略。首先,对传统的功率均分下垂算法进行分析,设计了虚拟电阻回路,并用锁相环代替了下垂控制回路,克服了传统下垂控制暂态响应慢、设计复杂和稳定裕度有限等缺点。该策略在线路阻抗对称和不对称时,都具有很好的负载均分能力。最后,搭建了小功率微网试验平台,试验结果验证了新型控制策略的有效性。

The droop control strategy is usually used in the power sharing control of in islanded microgrids, but the transient response is slow. Aiming at it, this paper proposes a new power sharing control strategy for improving the transient response in islanded microgrids. First, the traditional power sharing droop algorithm had been analyzed, and then designed a virtual resistor loop and the phase-locked loop to replace the new droop control scheme, which overcomes the other shortcomings of the traditional droop control, such as slow transient response, complex design and stability margin small. Also the new method won the good load sharing ability in the condition of symmetry and asymmetry. Finally, the test platform of the small power microgrid is built and the related experiments are carried out. The results show the effectiveness of the new control strategy.