CAJ | 학술논문

目前，模块化多电平变流器(modular multilevel converter，MMC)多应用于50或60 Hz运行的恒频领域，在交流调速领域还没有得到应用。这是由于，变流器模块电容没有钳位电路支撑，工作时模块电容电压将产生波动，且变流器输出频率越低，该波动越剧烈。一方面，模块电容电压波动将会对变流器开关器件和模块电容的安全工作范围造成影响；另一方面，变流器模块电压波动也会造成变流器输出电压畸变。提出在桥臂共模电流和输出共模电压中同时注入高频分量的方法来抑制电容电压波动，并提出实际值调制方法来消除模块电压波动造成的输出电压畸变，从而使得变流器能够工作在低频状态。最后通过实验证明所提出的控制方法的有效性。
목전，모괴화다전평변류기(modular multilevel converter，MMC)다응용우50혹60 Hz운행적항빈영역，재교류조속영역환몰유득도응용。저시유우，변류기모괴전용몰유겸위전로지탱，공작시모괴전용전압장산생파동，차변류기수출빈솔월저，해파동월극렬。일방면，모괴전용전압파동장회대변류기개관기건화모괴전용적안전공작범위조성영향；령일방면，변류기모괴전압파동야회조성변류기수출전압기변。제출재교비공모전류화수출공모전압중동시주입고빈분량적방법래억제전용전압파동，병제출실제치조제방법래소제모괴전압파동조성적수출전압기변，종이사득변류기능구공작재저빈상태。최후통과실험증명소제출적공제방법적유효성。
By now the modular multilevel converter (MMC) has been mainly applied to constant frequency applications (50 or 60 Hz) and not been used in the AC drive field. It is because that the sub-module capacitor of MMC does not have clamp circuit and a fluctuation of sub-module capacitor voltage would emerge. Moreover the lower the output frequency is, the more serious the fluctuation is. On one hand, the fluctuation of the sub-module capacitor voltage of MMC would threaten the security operation of the switching devices and sub-module capacitors;On the other hand the fluctuation also would cause distortion on the output voltage of MMC. In order to suppress the fluctuation of capacitor voltage, this paper presented a control method that high frequency component is added simultaneously to common-mode of arm current and output voltage. And also this paper proposed an actual value modulation algorithm to eliminate the distortion of output voltage caused by the fluctuation of capacitor voltage. At last experiment results demonstrated the effectiveness of the proposed control scheme.