分析了基于電流滯環(huán)控制的矩陣變換器—永磁同步電機（MC-PMSM）系統(tǒng)的開關組合狀態(tài)和存在的缺點：系統(tǒng)側(cè)電流存在較大的5 次和7 次諧波分量。提出了一種改進的電流控制方法，該方法采用電機電流雙環(huán)控制，得出三相電機電流的6 個電流控制信號，并將輸入三相電壓分成12 個相區(qū)，根據(jù)電流控制信號和相區(qū)號的不同，選擇不同的輸入相與輸出相連接，確定出矩陣變換器開關組合狀態(tài)。在此方法下，每個輸入相在整個周期內(nèi)都參與調(diào)制，降低了系統(tǒng)輸入電流的諧波分量，提高了系統(tǒng)輸入電流的正弦度。
Abstract: This paper presented an improved current hysteresis-loop modulation approach for the vector control of matrix converter- permanent magnet synchronous motor (MC-PMSM) system. With the approach, the three-phase input voltages were divided into 12 sections and 3 pairs of current control signals were deduced by comparing the reference values and the measured values of the output currents based on double current loops. Then, the states of the switches in the MC-PMSM system were determined according to the section number of the input voltages and one of the 3 pairs of current control signals, so that the modulation of every input voltage phase held in the whole periods. Hence the 5th harmonic, the 7th harmonic, and the total harmonic distortion (THD) of the input currents, which were relative large when the based current hysteresis-loop modulation method was adopted in the system, are obviously reduced and the input currents of the system become more sinusoidal.
關鍵詞﹕矩陣變換器；永磁同步電機；諧波分量；電流雙環(huán)控制；矢量控制
Keywords: Matrix converter, permanent magnet synchronous motor, harmonic components, double current loop modulation, vector control