中国科学院合肥物质科学研究院机构知识库

针对先进实验超导托卡马克(EAST)极向场电源等特殊负载产生的低次谐波(75-125 Hz)难以治理的问题,提出了一种有源无源相结合的新方法。详细阐述了低频抑制型混联有源电力滤波器(APF)实验平台的结构原理;并利用谐振频率点处增益趋于无穷大的特点,将准比例谐振(PR)控制用于谐波提取;同时,介绍了一种降低直流侧中点电压波动的三电平空间电压矢量调制算法,并给出了基本矢量作用时间的求取方法。通过实验平台对低次谐波的抑制效果,验证了低频抑制混联方案的正确性及可行性。

Aiming at the problem that the low harmonics(75N125 Hz)generated by special loads such as the polar field power supply in the experimental advanced superconducting Tokamak(EAST),a new method of combining active and passive sources is proposed.The structure principle of the experimental platform of low frequency modulation hybrid active power filtcr(APF)is described in detail;The quasi-proportional resonance(PR)control is used for harmonic extraction by using the characteristic that the gain tends to infinity at the resonance frequency point.In the meantime,a three-level space voltage vector modulation algorithm which reduces the voltage fluctuation of the middle point voltage of direct current is introduced,and the method of calculating the time of the basic vector is given.Through the experi- mental platform for the suppression of low-order harmonics,the correctness and feasibility of the low frequency suppression hybrid scheme are verified.