CAJ | 학술논문

直流母线电压平衡控制是H桥级联型整流器（CHBR）主要的研究问题。为此在建立CHBR的数学模型基础上,分析了一种基于比例-积分（PI）调节器的CHBR直流电压平衡控制算法,并针对其不能空载运行的问题展开研究,利用相量图法揭示了该方法在空载时失控的内在机理;同时根据分析的结果提出了改进算法。改进算法的主要特点是通过使各功率单元的交流侧电压基波相位保持相同来实现空载条件下的电压控制,它不仅适用于直流电压给定值相同或者不相同的CHBR控制,同时也易于扩展到多单元的CHBR。对所提的算法进行了仿真研究,并搭建两单元CHBR的实验样机,对文中提到的改进算法进行了实验验证。实验结果表明了改进算法的有效性,同时也验证了改进算法和原算法在空载运行特性上的差异。
직류모선전압평형공제시H교급련형정류기（CHBR）주요적연구문제。위차재건립CHBR적수학모형기출상,분석료일충기우비례-적분（PI）조절기적CHBR직류전압평형공제산법,병침대기불능공재운행적문제전개연구,이용상량도법게시료해방법재공재시실공적내재궤리;동시근거분석적결과제출료개진산법。개진산법적주요특점시통과사각공솔단원적교류측전압기파상위보지상동래실현공재조건하적전압공제,타불부괄용우직류전압급정치상동혹자불상동적CHBR공제,동시야역우확전도다단원적CHBR。대소제적산법진행료방진연구,병탑건량단원CHBR적실험양궤,대문중제도적개진산법진행료실험험증。실험결과표명료개진산법적유효성,동시야험증료개진산법화원산법재공재운행특성상적차이。
It is a challenge to balance the DC-link voltages of cascaded H-bridge rectifier（CHBR）.We put forward an improved PI-based control method.Firstly,we establish a mathematics model of CHBR and introduce a PI-based DC-voltages balancing method.Then,we adopt the phasorial diagram method to discover and analyze the intrinsic reason that CHBR can not work on no-load condition with this control scheme.Based on the analysis results,measures are taken in control scheme to make the phases of all the cells＇ AC side voltage equal,which guarantees stability of system when the CHBR works on the no-load condition.The improved method can regulate the cell＇s voltages well,either the reference voltages are the same or different.Furthermore,it can easily extend to the CHBR with more cells,and is testified by a 4-cell CHBR simulation results.A 2-cell CHBR prototype is built in the laboratory.Accordingly,comparison experiments by the referred control method are done.The experimental results indicate the feasibility of the presented method and good performance on the no-load condition with the improved control scheme.