CAJ | 학술논문

在全桥SPWM控制的单相逆变器中，输出侧一般接有变压器，因此需要考虑直流偏磁对变压器及系统造成的影响。直流偏磁会导致变压器饱和，降低系统运行效率，有时甚至严重影响系统运行。分析了单相逆变器中变压器产生直流偏磁的原因；对常用的几种抗偏磁措施进行了比较，提出一种通过外积分罗氏线圈检测变压器励磁电流，利用闭环反馈计算出补偿量并加入控制环节抑制偏磁的方法。具有设计简单、节省成本的优点，实验表明可有效抑制直流偏磁。
재전교SPWM공제적단상역변기중，수출측일반접유변압기，인차수요고필직류편자대변압기급계통조성적영향。직류편자회도치변압기포화，강저계통운행효솔，유시심지엄중영향계통운행。분석료단상역변기중변압기산생직류편자적원인；대상용적궤충항편자조시진행료비교，제출일충통과외적분라씨선권검측변압기려자전류，이용폐배반궤계산출보상량병가입공제배절억제편자적방법。구유설계간단、절성성본적우점，실험표명가유효억제직류편자。
In the full-bridge SPWM controlled single-phase inverter,on the output side is normally a transformer.Therefore,the impact of DC magnet bias upon the transformer and the system should be taken into account.DC magnet bias would lead to transformer saturation,reduce the working efficiency of the system,and even seriously affect system operation in some cases.This paper analyzes the reason why DC magnet bias is caused in the transformer of the single-phase inverter,compares ordinary measures taken against magnet bias,and presents an approach whereby that transformer excitation current is detected through Rogowski coil of external integration,the compensation value is calculated through the closed loop feedback,and a controlling unit is adopted for suppression of magnet bias.This approach has such advantages as simple design and cost saving.Experimental results indicate that the object of effective suppression of DC magnet bias can be achieved.