鉴于非线性冲击负载的影响,光伏电网母线出现电压跌落大、电压不平衡问题.提出一种基于三相VSC的超导储能技术前馈线性化控制方法.利用三相VSC变流器构建数学模型,如果简单地以交轴电流和直流电压来构建控制系统,物理上很难实现.所以文中以直轴和交轴电流来实现电流闭环控制,并在直轴电流环前置电压调节器实现了直流电压的前馈闭环控制.从而推导出三相VSC变流器的逆系统.并构造出伪线性系统.考虑建模误差、系统的快速反应和增强鲁棒性,采用内环PI控制器对伪线性系统进行综合.实现了交轴电流分量和直流电压的解耦,对该闭环控制系统计算机仿真的效果良好.%Photovoltaic power quality problems such as voltage drop and unbalanced voltage on the bus are often caused by the nonlinear load shock. This paper proposes a linearization feedback control method based on the superconducting energy storage technology for the three-phase VSC converter. Combining the three-phase converter VSC mathematical model with three state feedback variables-de output voltage, active and reactive current, the inverse system based on the three-phase VSC converter is deduced and the virtual linear system is constructed too. Considering the modeling errors, system of rapid reaction and improving robustness, the inner current ring controller is used to multiple the virtual linear system. The target of decoupling reactive power current with dc voltage is achieved. The computer simulation for the closed loop control system suggests that the proposed method is of good performance.
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