基于在线扰动补偿的三电平PWM整流器级联式无差拍控制策略

Cascaded Deadbeat Control Strategy with Online Disturbance Compensation for Three-Level PWM Rectifier

该文以三电平脉宽调制(PWM)整流器为研究对象,提出一种基于在线扰动补偿的级联式无差拍控制(CDBC)策略。该策略内外环均采用了无差拍控制方式,并建立龙伯格观测器分别对功率模型扰动和负载扰动进行估计和补偿,实现有功功率和无功功率的解耦控制以及系统快速响应。在参数设计方面,采用极点配置方法整定观测器增益,并引入期望周期数对电压环系数进行调节,从而实现内外环较高匹配性。在稳态和动态条件下,对所提控制策略进行仿真和实验,结果表明,相比于传统的无差拍功率控制(DBPC),所提控制策略可以实现更加准确的单位功率因数和更强的抗负载扰动能力。

A cascaded deadbeat control(CDBC)strategy with online disturbance compensation is proposed for three-level pulse width modulation(PWM)rectifiers in this paper.Specifically,to realize the decoupling between active power control and reactive power control and to ensure the fast response of system,deadbeat control is adopted for both inner and outer loops,and Luenberger observers are established to estimate and compensate the disturbances brought by inaccurate power model and load variation.In terms of parameter design,the pole placement method is adopted to determine the gain of the observer,and the expected cycle value is introduced into the voltage loop for parameter adjustment,which achieves good matching between inner and outer loops.A series of simulations and experiments are carried out to test the proposed strategy under steady and dynamic conditions.It is shown that the CDBC strategy presents more accurate unity power factor and stronger robustness against load disturbance than the conventional deadbeat power control(DBPC).