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Fix-frequency robust power model predictive control method for three-phase PWM rectifiers under unbalanced grid conditions
Journal of Power Electronics ( IF 1.3 ) Pub Date : 2020-07-17 , DOI: 10.1007/s43236-020-00118-3
Xin Guo , Min Xiao , Yu-er Gao , Qingyu Wang , Yihao Wan

Under unbalanced grid conditions, the controller design of a three-phase pulse width modulation (PWM) rectifier is based on an instantaneous power model. By calculating the current references of the converter according to the instantaneous power model, traditional voltage-oriented control (VOC) methods realize the positive-sequence and negative-sequence active and reactive current control of the converter separately using the proportional-integral (PI) controller. However, due to the inner current loop control structure of the traditional VOC method, it is impossible to realize the regulation of all six power components in a common instantaneous power model under an unbalanced grid. Meanwhile, the control performance of the traditional VOC method with a PI controller is degraded under the circuit parameters uncertainty condition. In this paper, a fixed switching frequency robust power model predictive control method (FRP-MPC) is proposed for three-phase PWM rectifiers under the unbalanced grid condition. The proposed control strategy has a number of advantages. An improved instantaneous power model is used for the fixed switching frequency model predictive controller design under the unbalanced grid condition, which has less power variables than the common instantaneous power model. The robustness of the MPC controller is improved by adding a robust item into the predictive model under circuit parameters uncertainty. Simulation and experiment results verify the effectiveness of the proposed control method.

中文翻译:

不平衡电网条件下三相PWM整流器定频鲁棒功率模型预测控制方法

在不平衡电网条件下,三相脉宽调制 (PWM) 整流器的控制器设计基于瞬时功率模型。传统的电压导向控制(VOC)方法根据瞬时功率模型计算换流器的电流给定,利用比例积分(PI)分别实现换流器的正序和负序有功和无功电流控制控制器。但是,由于传统VOC方法的内部电流环控制结构,在不平衡电网下,不可能在一个普通的瞬时功率模型中实现对所有6个功率分量的调节。同时,在电路参数不确定的情况下,采用PI控制器的传统VOC方法的控制性能有所下降。在本文中,针对不平衡电网条件下的三相PWM整流器,提出了一种固定开关频率鲁棒功率模型预测控制方法(FRP-MPC)。所提出的控制策略具有许多优点。改进的瞬时功率模型用于不平衡电网条件下的固定开关频率模型预测控制器设计,其功率变量比普通瞬时功率模型少。在电路参数不确定的情况下,通过在预测模型中添加一个鲁棒项来提高 MPC 控制器的鲁棒性。仿真和实验结果验证了所提出的控制方法的有效性。所提出的控制策略具有许多优点。改进的瞬时功率模型用于不平衡电网条件下的固定开关频率模型预测控制器设计,其功率变量比普通瞬时功率模型少。在电路参数不确定的情况下,通过在预测模型中添加一个鲁棒项来提高 MPC 控制器的鲁棒性。仿真和实验结果验证了所提出的控制方法的有效性。所提出的控制策略具有许多优点。改进的瞬时功率模型用于不平衡电网条件下的固定开关频率模型预测控制器设计,其功率变量比普通瞬时功率模型少。在电路参数不确定的情况下,通过在预测模型中添加一个鲁棒项来提高 MPC 控制器的鲁棒性。仿真和实验结果验证了所提出的控制方法的有效性。MPC 控制器的鲁棒性通过在电路参数不确定的情况下向预测模型中添加鲁棒项来提高。仿真和实验结果验证了所提出的控制方法的有效性。MPC 控制器的鲁棒性通过在电路参数不确定的情况下向预测模型中添加鲁棒项来提高。仿真和实验结果验证了所提出的控制方法的有效性。
更新日期:2020-07-17
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