摘要
关于三相电压型脉宽调制(pulse width modulation,PWM)整流器的控制方法一般采用两相旋转坐标系实施控制。一个主要原因是在同步旋转坐标系中电压、电流等变量在稳态时表现为直流信号,可以采用获得广泛应用的PI调节器达到稳态无静差控制。通过分析电压型PWM整流器的瞬时功率,在两相静止坐标系下提出一种新型的准直接功率控制策略。与传统的方法相比,省去了电网电压相位信息检测(如锁相环等)、电流环解耦控制以及旋转坐标变换,减少了检测环节误差带来的干扰以及参数不准确造成的解耦不彻底问题,提高了系统的稳定性,在两相静止坐标系下即可实现PWM整流器在电网侧单位功率因数运行。同时,对采用谐振控制器时,内外环控制器参数的设计进行理论分析并提出参数设计方法。计算机仿真与30kVA三相PWM整流器上的实验结果表明,本文提出方法性能优良、动态响应迅速。
For most of the existing control methods for PWM rectifier, rotating frame is widely adopted. The underlying reason is that the control variables exist in DC form in steady state and the most popular PI controllers can be adopted to eliminate the steady state error. Unlike most of the existing schemes, this paper presented a novel quasi direct power control method for PWM rectifier in stationary frame based on instantaneous power theory. In the proposed method, unity power factor is obtained without the need of grid voltage phase detecting （such as phase lock loop）, decoupling control or rotating transformation, which offers a simple control method for PWM rectifier. The parameters of the controllers were analyzed and the design algorithm was also presented. Computer simulations and experimental results on a 30kVA PWM rectifier prototype show excellent performance of the proposed method.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第9期47-54,共8页
Proceedings of the CSEE
