面向主动配电网的统一电能质量控制器补偿策略研究

Compensation strategy of unified power quality controller for active distribution network

主动配电网在充分发挥多种清洁能源优势的同时,不得不面对电能质量问题日益突出的困境。统一电能质量控制器(UPQC)可综合治理主动配电网中的电压质量和电流质量问题,是解决该问题的重要突破口。首先对UPQC系统进行解耦控制,将dq坐标下的数学模型转换到αβ坐标系下实现全解耦,得到串联侧和并联侧变流器的传递函数,然后分别设计了串联侧和并联侧的控制器,最后建立了UPQC系统整体的仿真模型。通过仿真验证了在电压跌落/暂升、负载电流畸变和无功电流、及综合电能质量存在的情况下,文中所设计的控制器具有较好的补偿效果。

While the active distribution network has fully utilized the advantages of various clean energy sources, it has to face the dilemma of increasing power quality problems. The unified power quality controller can comprehensively deal with the voltage quality and current quality problems in the active distribution network. Firstly, the UPQC system is decoupled and controlled, and the mathematical model under dq coordinates is converted to the αβ coordinating system to achieve full decoupling. The transfer functions of the series side and parallel side converters are obtained. Then the controllers on the series side and the parallel side are designed respectively. Finally, the simulation model of the UPQC system is established.The simulation results show that the controller designed in this paper has better compensation effect under the condition of the voltage drop or suspension, load current distortion.