为了实现低成本、精确地大容量无功补偿,设计了一种基于“SVG+智能电容”混合式无功补偿系统。系统由一台高精度补偿的小容量静止无功发生器(Static Var Generator, SVG)和多台智能电容组成。首先对混合系统中SVG的电流跟踪控制进行分析,针对PI控制对周期性信号跟踪性差和重复控制在负载突变时导致补偿电流畸变的问题,提出采用加权式并联型重复控制的电流跟踪控制策略。然后对整体系统的运行特性进行分析,给出系统无功分配控制方法。最后以TMS320F28335作为混合式系统的核心控制器,设计了一套混合式无功补偿系统。通过仿真和试验结果表明,混合无功补偿系统可以对无功电流进行有效的补偿。
英文摘要:
In order to realize low cost and accurate reactive compensation with large capacity, a hybrid reactive power compensation system based on "SVG+ intelligent capacitance" is designed. The system consists of a high precision small capacity static var generator (Static Var Generator, SVG) and multiple intelligent capacitors.Firstly, the PI control method has poor tracking performance for periodic signal and the repetitive control method will lead to the distortion of the compensation current when the load is mutated. In order to solve the problem, a weighted parallel repetitive control method strategy is proposed as the current tracking control strategy.Secondly, the operation characteristics of the whole system are analyzed, and the control method of the system reactive power distribution is given.At last, a hybrid reactive power compensation system is designed, and TMS320F28335 is used as the core controller of the system. The simulation and test results show that the reactive power compensation system can be effectively compensated by the hybrid reactive power compensation system.