摘要
脉冲宽度调制(pulse width modulation,PWM)整流器的无差拍电流控制能够快速准确地跟踪给定电流信号,但由于电感参数与控制延时的影响,会导致交流电流畸变,电流谐波含量增大甚至系统不稳定。针对该问题,该文提出一种改进无差拍电流预测算法,推导了单相PWM整流器改进算法的离散传递函数,分析电感参数和采样时间对控制系统稳定性能和动态性能的影响。将改进的无差拍电流控制方法应用于双闭环系统中,能够有效减小电网电流的3次谐波及总谐波失真(total harmonic distortion,THD),消除了电流畸变。整个系统在直流母线电压外环的控制下,实现了直流母线电压的精确控制。仿真结果和实验结果都证明了改进电流控制方法理论分析的正确性和可行性。
Deadbeat current control of pulse width modulation（PWM） rectifiers can quickly and accurately track the given current signal. However, the influence of inductance parameters and control delay can result in AC current distortion, increasing current harmonics and even instability of the system. To solve the above problems, this paper proposed an improved deadbeat current algorithm, deduced the discrete transfer function of a single-phase PWM rectifier, and analyzed the influence of inductance parameter and sample time on control system＇s stability and dynamic performance. Put the improved deadbeat current control method in the double-loop system, which can effectively reduce triple-frequency harmonics and total harmonic distortion（THD） of grid current and eliminate the current distortion. The entire system achieves to control the DC bus voltage precisely in outer DC bus voltage control. The simulation and experimental results prove the validity of the theoretical analysis and feasibility of the mentioned current control method.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2015年第22期5842-5850,共9页
Proceedings of the CSEE
基金
国家自然科学基金项目(51277004)~~
关键词
单相PWM整流器
无差拍电流控制
电感参数
控制延时
电流谐波
single-phase pulse width modulation（PWM） rectifier
deadbeat current control
inductor parameter
control delay
current harmonic
