研究配电变压器高压侧中间抽头接入静止同步补偿器(STATCOM)的设计方案,对Dyn11联结组变压器中间抽头注入电流对绕组电流分布的影响进行机理分析,验证了从抽头注入电流进行无功补偿的有效性.在此基础上,建立配电变压器-静止同步补偿器(DT-STATCOM)的欧拉-拉格朗日模型(E-L),补偿由变压器传变引起的幅值和相位偏差,得到了网侧有功、无功解耦的无源控制律,并采用阻尼注入方法来改善系统动态性能,实现对配电系统无功的快速补偿.最后,通过仿真与动模实验验证了变压器绕组电流分布理论分析的正确性,以及采用无源控制方法的DT-STATCOM系统具有良好的无功补偿效果和快速的动态跟踪性能.%This paper studied static synchronous compensator (STATCOM) connected to the system via intermediate taps on the primary windings of the distribution transformer. For Dyn11 connection transformer, the effects of injection currents on current distribution in the transformer wingdings were analyzed. The theory analyses indicate that it is valid to inject currents via winding taps for reactive power compensation. The Euler-Lagrangian (E-L) model of the distribution transformer-static synchronous compensator (DT-STATCOM) was established. The amplitude and phase angle differences introduced by transformer winding connection were compensated. The passivity-based control (PBC) can decouple active and reactive power control. Damping injection was applied to improve the dynamic performance of the control system and achieve fast reactive power compensation response. Finally, both simulation and experimental results verified the current distribution in the windings as well as the effectiveness of the reactive power compensation system integrated with distribution transformer based on PBC method.
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