CAJ | 학술논문

针对光伏并网发电逆变器由于昼夜、天气阴晴变化导致其利用率低的问题,提出了一种基于负载类型辨识和考虑负载轻重的三相光伏并网发电和有源电力滤波统一控制策略,并给出了指令电流合成方法。该策略在保证最大光伏电能并网的同时,实现了对负载谐波与无功电流的最佳补偿,尤其轻载时无需谐波电流检测,极大地提高了系统的响应速度。该系统基于DC/DC/AC高频链电路结构,克服了传统光伏并网发电系统中工频变压器耗材严重的不足。用Matlab/Simulink对提出的控制策略进行建模仿真,实验结果证明了该策略的有效性。
침대광복병망발전역변기유우주야、천기음청변화도치기이용솔저적문제,제출료일충기우부재류형변식화고필부재경중적삼상광복병망발전화유원전력려파통일공제책략,병급출료지령전류합성방법。해책략재보증최대광복전능병망적동시,실현료대부재해파여무공전류적최가보상,우기경재시무수해파전류검측,겁대지제고료계통적향응속도。해계통기우DC/DC/AC고빈련전로결구,극복료전통광복병망발전계통중공빈변압기모재엄중적불족。용Matlab/Simulink대제출적공제책략진행건모방진,실험결과증명료해책략적유효성。
The gird-connected photovoltaic （PV） inverters usually operate in low utilization for diurnal variations and weather changes. A new strategy for three-phase grid-connected PV generation systems is proposed,which has the shunt active power filter function. The strategy is based on load-level judgment and load-type identification,whose synthetic methods of instruction current is given. The new strategy not only makes full use of PV power,but also compensates harmonics and reactive currents of the loads very well,especially when the loads are in low level. The system response speed would be improved quickly without harmonics current detection. The new configuration adopts the DC/DC/AC high frequency link main circuits,which overcomes the shortcoming of the power frequency transformer＇s serious supplies in the traditional PV gird-connected systems. With the modeling and simulation of the proposed control strategy by Matlab/Simulink,the experimental results show that the control strategy is validated.