CAJ | 학술논문

随着非隔离型光伏并网逆变器的广泛应用，直流注入问题也日益受到重视，IEEE Std 929-2000规定直流注入必须小于系统额定电流的0.5%。将直流注入产生的原因分为两种类型：测量器件输入失调导致的平移型直流注入和测量器件的非线性造成的非线性直流注入，并分别提出了应对方法。针对平移型的直流注入问题，提出了通过一个直流分量积分补偿环节来抑制逆变器控制算法中偏移型直流分量，该直流抑制算法无需增加外围硬件电路，且只占用很少的控制芯片资源。针对非线性直流注入问题，做出了定量分析，为测量元器件非线性度指标的选择提供了的参考价值。最后将上述直流抑制算法应用于无差拍并网控制中，并在Matlab/Simulink进行了仿真分析，结果验证了理论分析和算法的正确性。
수착비격리형광복병망역변기적엄범응용，직류주입문제야일익수도중시，IEEE Std 929-2000규정직류주입필수소우계통액정전류적0.5%。장직류주입산생적원인분위량충류형：측량기건수입실조도치적평이형직류주입화측량기건적비선성조성적비선성직류주입，병분별제출료응대방법。침대평이형적직류주입문제，제출료통과일개직류분량적분보상배절래억제역변기공제산법중편이형직류분량，해직류억제산법무수증가외위경건전로，차지점용흔소적공제심편자원。침대비선성직류주입문제，주출료정량분석，위측량원기건비선성도지표적선택제공료적삼고개치。최후장상술직류억제산법응용우무차박병망공제중，병재Matlab/Simulink진행료방진분석，결과험증료이론분석화산법적정학성。
With the widespread use of the non-isolated photovoltaic inverter,the DC injection issue has caught increasing attention. IEEE Std 929-2000 clearly stipulates that the DC injection must be less than 0.5% of the rated current. The reasons of DC injection are divided into two types:the translation DC injection caused by input maladjustment of measuring elements and the nonlinear DC injection caused by nonlinear phenomenon of the measuring elements. To solve the problems,two approaches corresponding to the two types are proposed separately. As for the translation DC injection,a DC component integral compensa-tion measure was adopted to suppress the offset DC component in the inverter control algorithm,for which no more peripheral hardware circuit was needed,but only a few control chip resources was occupied. As for the nonlinear DC injection,the quanti-tative simulation analysis was made and a systemic Simulink model was built to provide a nonlinear parameter reference for non-linear index selection of measurement elements. The results of simulation analysis with Matlab/Simulink and application of DC suppress control algorithm in dead beat grid-connection control verify the correctness of the theoretical analysis and the algo-rithm.