基于分数阶PI的三相并网整流器调压优化策略

DC voltage regulation optimization strategy of three-phase grid-connected rectifier based on fractional-order PI regulator

直流侧电压具有优良的动态响应与抗扰动特性是衡量三相并网整流器性能的关键。本文论述了一种基于分数阶PI调节器(FOPI)的整流器直流电压双闭环控制策略,FOPI相较于PI多了一个控制自由度,故可利用FOPI提升三相并网整流器直流电压的动态性能与抗扰动能力。首先,建立三相并网整流器在dq坐标系下的数学模型,给出了基于传统PI/FOPI的直流电压双闭环控制策略;其次,在分析水循环算法(WCA)原理的基础上,阐述了基于WCA的PI与FOPI的参数设计方法;最后,利用MATLAB仿真软件建立三相并网整流器的仿真模型,进行了相应的案例仿真与实验测试对比验证。仿真与实验对比结果表明,所述FOPI比传统PI在改善三相并网整流器直流电压的动态响应特性和抗扰动性能两个方面均更具优越性。

The key to measure the performance of three-phase grid-connected rectifier(TGR)is that the DC voltage has both excellent dynamic response and anti-disturbance characteristics.A TGR DC voltage dual closed-loop control strategy based on fractional-order PI regulator(FOPI)is expounded in this paper.FOPI has one more control degree of freedom than PI,so FOPI can be used to improve both the dynamic performance and anti-disturbance capability of TGR DC voltage.Firstly,the mathematical model of TGR in dq coordinate system is established,and the DC voltage dual closed-loop control strategy based on PI/FOPI is given.Then,the parameter design methods analyzed by WCA for both PI and FOPI are expounded.Finally,the grid-connected simulation model of TGR is established by MATLAB,and corresponding case simulation as well as experimental comparison verification are carried out.Both simulation and experimental comparison results show that FOPI is better than traditional PI to improve the dynamic response characteristics and anti-disturbance performance of TGR DC voltage.