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直接耦合式串联补偿装置常用来解决配电网中电压暂降、暂升以及瞬时间断等多种电能质量问题。串联补偿装置投入补偿时,具有磁饱和特性的负载由于承受电压的变化会导致磁饱和或偏磁现象。为解决串联补偿装置运行初期磁饱和带来的电流冲击,通过分析磁饱和及偏磁现象产生的过程,基于磁通平衡的原理提出磁饱和抑制策略,恰当应用串联补偿装置的输出来控制负载承受电压,消除磁饱和问题,避免冲击电流带来的破坏性影响,并实现迅速及时、安全有效的补偿。仿真与实验结果表明,冲击电流得以控制,验证了所提控制策略的有效性与可行性。
Direct coupled series compensation device is often used to solve the power distribution network voltage dips, transient and instantaneous interruption and other power quality problems. When the series compensation device is put into compensation, the load with magnetic saturation will cause magnetic saturation or bias phenomenon due to the change of withstand voltage. In order to solve the current shock caused by the magnetic saturation during the initial operation of the series compensator, the magnetic saturation suppression strategy is proposed based on the flux balance principle by analyzing the process of magnetic saturation and bias. The output of the series compensator is properly used to control the load bearing Voltage, eliminate the problem of magnetic saturation, to avoid the destructive impact of the impact current, and to achieve prompt, safe and effective compensation. Simulation and experimental results show that the inrush current can be controlled, which verifies the effectiveness and feasibility of the proposed control strategy.