CAJ | 학술논문

三相 AC/DC 变流器广泛应用于中高功率场合，空间矢量脉宽调制(space vector pulse width modulation， SVPWM)以其直流电压利用率高、谐波含量低等优势，成为三相AC/DC变流器的一种常用控制方式。其需要检测电网电压进行锁相，得出电网电压的瞬时相位角，并参与坐标变换，最终得到空间电压矢量的基准。然而，由于电网电压存在畸变，且对电网电压的检测和锁相角计算过程中会产生一定的误差，从而影响控制精度。针对可实现能量双向流动的三相AC/DC变流器，讨论进行无锁相控制的可行性，提出一种无锁相环 SVPWM 控制方法，分析电网实际频率与参与坐标变换的相位角给定频率出现偏差时对变流器的影响，并采用无功功率闭环调节控制策略，对频率给定进行实时校正，最后通过仿真和实验验证了理论分析的正确性。
삼상 AC/DC 변류기엄범응용우중고공솔장합，공간시량맥관조제(space vector pulse width modulation， SVPWM)이기직류전압이용솔고、해파함량저등우세，성위삼상AC/DC변류기적일충상용공제방식。기수요검측전망전압진행쇄상，득출전망전압적순시상위각，병삼여좌표변환，최종득도공간전압시량적기준。연이，유우전망전압존재기변，차대전망전압적검측화쇄상각계산과정중회산생일정적오차，종이영향공제정도。침대가실현능량쌍향류동적삼상AC/DC변류기，토론진행무쇄상공제적가행성，제출일충무쇄상배 SVPWM 공제방법，분석전망실제빈솔여삼여좌표변환적상위각급정빈솔출현편차시대변류기적영향，병채용무공공솔폐배조절공제책략，대빈솔급정진행실시교정，최후통과방진화실험험증료이론분석적정학성。
Three-phase AC/DC converters are widely used in medium and high power applications. SVPWM is the most common control method for the advantage of high DC voltage utilization and low harmonic content. The method needs to detect the grid voltage with the phase locked loop. The instantaneous phase angle of the grid voltage can be calculated for the coordinate transformation. Thus the reference space voltage vector can be obtained. However, the grid voltage distortion may exist. Moreover, the detection of grid voltages and the calculation of phase angles may have errors, which would influence the control precision. This paper discussed the feasibility of the SVPWM control method without the phase-locked loop (PLL) for bidirectional three-phase AC/DC converters, proposed a control method without PLL, analyzed the effect of frequency deviation, and showed the method of frequency correction using reactive power closed-loop regulation. Finally, simulation and experimental results verify the theoretical analysis.