混合配电变压器无功和电压补偿控制策略研究

Research on Reactive Power and Voltage Compensation Control Strategy of Hybrid Distribution Transformer

针对传统配电变压器功能单一、可控性差的问题,结合工频变压器稳定可靠和背靠背变换器易于控制的优点,给出了一种集成无功和电压补偿功能的智能混合式配电变压器(HDT)拓扑结构。基于背靠背变换器的两级结构特点,分别设计了针对整流级和逆变级的控制策略,从而实现了电网无功补偿和负载电压动态稳定控制的功能。最后分别基于PSIM仿真软件和RT-BOX搭建了HDT的仿真和硬件在环实验模型,仿真和硬件在环实验结果验证了所提拓扑和控制策略的正确性和有效性。

Aiming at the problems of single function and poor controllability of traditional distribution transformer,combining the reliable power-frequency multi-winding transformer with highly controllable back-to-back converter,an intelligent hybrid distribution transformer(HDT) integrating reactive power and voltage compensation is given firstly.Furthermore,according to the characteristics of the two-stage structure of the back-to-back converter,the control strategies are designed for rectifier stage and inverter stage respectively to realize the functions of gird reactive power compensation and dynamic load voltage sag compensation.Finally,based on PSIM simulation software and RT-BOX platform,the simulation and hardware-in-the-loop experiment models of the given HDT are built,the simulation and hardwarein-the-loop experiment results verify the correctness and effectiveness of given hybrid transformer topology and the proposed control strategy.