基于超导储能的动态电压恢复器的研究

为了给动态电压恢复器提供工作时所需能量,采用了直—直斩波电路将超导储能装置接于动态电压恢复器中。在分析了储能部分的电路构成后采用PI调节分别控制超导线圈的充、放电过程,其充电过程采用电流控制模式,放电过程采用电压控制模式从而有效地克服了外界干扰和参数变化等不利因素,充分发挥超导储能快速充放电和高能量密度转换的特性;基于dq变换检测控制动态电压恢复器的工作,并对系统在电压暂降情况下动态电压恢复器的工作状况进行了仿真分析。仿真结果表明这种基于超导储能的动态电压恢复器可迅速有效的补偿电压暂降,维持敏感负荷的电压恒定。

Research on Superconducting Magnetic Energy Storage Based on Dynamic Voltage Restorer

This article studies superconducting magnetic energy storage(SMES) based Dynamic Voltage Restorer(DVR).It connects the SMES to the DVR by a DC-DC converter,to supply the energy for the DVR at working.The circuit configuration is analyzed and researched.It takes PI regulator as the control method of charge and discharge of the energy storage system.When it works in charge mode,the current of the superconducting winding is maintained at a fixed value.And when it works in discharge mode,the voltage of the DC bus is maintained at a fixed value.This method can overcome the disadvantages such as interfluence of the environment and parameter change of the system,and can realize the high-speed energy flow between SMES and DVR.In the DVR part,dq change is adopted to check and control the work condition,to achieve the fast control.Then simulation is made to analyze the situation of this SMES based on DVR when the fault of the voltage sag happens.The simulation results indicate that the SMES has advantages of high energy density and high speed of energy flow.And this SMES based on DVR can compensate the voltage sag rapidly and effectively,to maintain the voltage of sensitive load.