摘要
三相电压型PWM整流器通常采用在d-q同步坐标系下的双闭环控制,其中内环控制输入电流,外环控制输出电压。在这种控制方式中,有功电流的指令值是电压调节器的输出,有功电流的调节特性直接影响输出电压。在通常的控制策略中,只保证了期望的稳态性能,不能保证在动态过程中电流的快速跟踪,而缓慢的动态响应可能导致在暂态过程中输出电压出现较大的超调甚至不可控。基于这种双闭环控制结构,通过对影响电流动态响应速度的因素进行深入分析,提出了通过最大d轴电压来提高有功电流动态响应速度的一种新的控制方法,提高了输出电压的动态响应性能。仿真和实验结果表明,与通常的控制方法比较,提出的控制方法具有快速的动态响应和优良的稳态性能。
The double closed-loop controller in the d-q synchronous coordinate reference frame is usually used to control the three-phase voltage-source PWM rectifier, where the inner loop is used to control the input current and the outer loop is used to control the output voltage. In this controller, the active current command is the output of the voltage regulator, and the active current regulation characteristics directly influence the output voltage. The usual control strategy only assures the expected steady performance, cannot ensure fast tracking current in the dynamic process, and the slow dynamic response may cause output voltage have larger overshoot even be uncontrollable in transient process. Based on this double closed-loop control structure, and analysis of factors affecting the current dynamic responding speed, a new control strategy is proposed to improve the dynamic response speed of active current by the maximum d-axis voltage. The simulation and experimental results show that the proposed control method has a fast dynamic response and excellent steady-state performance compared with the traditional control method.
出处
《控制工程》
CSCD
北大核心
2016年第2期269-272,共4页
Control Engineering of China
基金
国家自然科学基金(50807041)
