分布式电源参与的配电网电能质量控制策略研究

考虑到并网逆变器与有源电力滤波器在拓扑结构、使用功能以及控制方法上的相似性，提出了一种将并网发电与电力有源滤波相结合的统一控制策略。在详细分析统一控制系统结构与工作原理的基础上，从谐波与无功电流检测、电压与电流控制等方面进行分析设计，实现了在dq旋转坐标系下对系统的统一控制。该控制策略使并网逆变器在并网发电的同时也能进行谐波抑制与无功补偿，不仅充分发挥了分布式发电的优越性，而且改善了电网的电能质量。最后通过仿真验证了该控制策略的有效性与可行性。

Research on power quality control strategy incorporatingdistributed generation

Considering the similarity in structures, using functions and control methods of the grid-connected inverter and active power filter, a unified control strategy is proposed. This strategy can realize both grid-connected power generation and active power filtering. Based on the analysis of the architecture and principle of the unified control system, harmonic and reactive current detection, voltage and current control method are designed for the system. Finally, the system can be controlled in the revolving coordinate reference frame. Using this unified control strategy, grid-connected generation, harmonics suppression and reactive power compensation are achieved at the same device, which exerts the advantage of distributed generation and improves grid power quality. At last, simulation results verify the validity and feasibility of the proposed strategy.