摘要
首先,从现有三相PWM整流器的d,q模型出发,得到一种通用的矢量解耦控制策略;然后,根据频域分析法,得出整流器的一阶惯性模型,由此推导出系统的频域控制模型。此外,为了提高系统的动态性能,提出一种新型负载电流前馈控制方案。该方案将负载电流看作系统的一个外部干扰信号,并根据控制系统的频域控制模型得出对该干扰信号的最佳补偿,通过对其进行拉氏逆变换后,整定为一单位脉冲函数,再将它加在d轴指令电流输出环节,大大提高了系统对指令电流的跟踪能力。最后,通过仿真和试验,验证了该前馈控制方案可将系统电流的响应速度提高25%。
Based on the present d,q model of three phase PWM rectifier,we got a general vector decoupling control strategy.Then according to frequency domain control method we educed the rectifier＇s one-order inertia model and deduced the system＇s frequency domain control model.To improve the dynamic performance of the system,a new load current feedforward control scheme was put forward.The scheme viewed the load current as an external interferential signal to the system and drew out the fittest compensation of the interference using the frequency domain model of the control system.The result was adjusted into a unit pulse function by an inverse L-transformation and was added to the d-axis command current output node ,which greatly boosted the system＇s tracking ability to the command current.At last, simulation and test verifies that the strategy can improve the current responding speed by 25percent.
出处
《电力电子技术》
CSCD
北大核心
2005年第4期53-55,62,共4页
Power Electronics
关键词
整流器
矢量控制
惯性
前馈控制
rectifier
vector control
inertia
feedforward control
