大功率变流器同步信号的状态变量滤波器设计

Design of state variable filter for synchronizing signal of polarity field converter

EAST极向场电源是由晶闸管相控整流电路组成的大功率变流器,其同步信号的取用至关重要。为提高控制精度,采用EAST极向场电源系统中整流变压器的次级电压信号作为同步信号。由于该同步信号中包含大量的谐波及噪声,所以需要对其进行滤波。通过分析同步信号的特点,提出了滤波器设计要求,比较不同滤波器特点后,选用状态变量滤波器进行滤波,并对状态变量滤波器的设计进行了详细的理论分析和参数计算。最后通过RT-LAB实时仿真测试和实验证明,该滤波器具有理想的滤波效果,可以实现同步信号的精确提取。

Firing synchronization is the key for thyristor rectifier control in the EAST polarity field converter power supply system. The converter-transformed second ary voltage signal was adopted as the synchronizing signal to improve the control precision. The state variable filter was used to filter the harmonics and the noise of the synchronizing signal. According to the requirements of the synchronizing signal, the filter design criteria were proposed. The analysis and the parameter calculation of the state variable filter were also made. The real-time simulation and the experiments on the EAST polarity field converter power supply system prove that the designed filter can extract precise synchronization signals.