配电变压器集成化补偿系统的多目标分析及控制

Multi-Object Analysis and Control of Static Synchronous Compensators Integrated with Distribution Transformer

配电网中广泛使用的配电变压器是电能供给和需求的交汇点,也是无功、谐波、不平衡等不利因素对供电产生影响的集散点。针对配电变压器集成化静止补偿系统(DT-STATCOM)结构,对配电网无功、谐波和不平衡等电能质量问题进行分析,提出了与配电网整体控制相协调的基于动态权重优化的多目标综合控制策略。在研究补偿机理的基础上,分别设计了非线性无源控制电流内环跟踪、基于双旋转坐标系的比例准谐振控制、基于零序电压注入的负载电流不平衡校正方法。实验结果表明所提出的多目标综合控制策略能够有效提高STATCOM的动态响应速度,改善综合补偿效果。

The widely used distribution transformer is a joint of power supply and requirement in distribution network. Meanwhile, it is a key point for reactive power, harmonics and other negative factors to affect power quality. In this paper, DT-STATCOM （Distribution Transformer STATCOM） is served to solve the power quality problems such as reactive power, harmonics, and unbalance in distribution grid. Then, a multi-objective integrated control strategy based on dynamic weight optimization coordinated with the overall control of the distribution network is proposed. On the basis of the study of the compensation mechanism, nonlinear passivity-based control （PBC）, double-rotating-coordinate-based quasi-proportional resonant （PR） control and zero sequence voltage injection method are designed respectively. Simulation and experimental results validate the feasibility and effectiveness of proposed multi-objective integrated control strategy of DT-STATCOM.