源荷波动时含固态变压器的有源配电网动态无功优化方法

Dynamic reactive power optimization method of active distribution network with solid state transformer under source load fluctuation

针对分布式电源并网引起的双向潮流导致网损增大以及分布式电源、负荷的波动导致节点电压波动等问题,文章基于固态变压器(Solid State Transformer,SST)两侧电力电子变换器的脉冲宽度调制技术,提出了一种控制潮流的方法。该方法首先建立了含SST的有源配电网动态无功优化模型;然后以多时刻的有功网损和电压波动为优化目标,采用改进多目标粒子群算法对SST的一、二次侧的电力电子变换器的调制角和调制系数等多个控制变量进行求解;最后建立仿真模型并与基于有载调压变压器的有源配电网动态无功优化方法进行比较。结果证明了所提方法在降低配电网网损和维持节点电压稳定方面的优越性。

In order to solve the problems of increasing network loss caused by bidirectional power flow and node voltage fluctuation caused by fluctuation of distributed power and load,This paper proposes a method to control power flow based on pulse-width modulation technology of power electronic converters on both sides of Solid State Transformer.In this paper,the dynamic reactive power optimization model of active distribution network with SST is firstly established.Then,the improved multi-objective group algorithm is used to solve the control variables such as modulation Angle and modulation coefficient of the power electronic converter based on the primary and secondary sides of SST,aiming at the multi-time active network loss and voltage fluctuation.Finally,the simulation model is established and compared with the active distribution network dynamic reactive power optimization method based on on-load voltage regulating transformer.The results prove the superiority of the proposed method in reducing network loss and maintaining node voltage stability.