CAJ | 학술논문

基于Z源逆变器的光伏并网系统,其工作特点及控制结构不同于传统的电压型逆变器,可以利用逆变器桥臂直通状态实现升压功能,从而满足光伏电池电压大范围变化场合下的并网要求.对控制系统进行了详细的设计和分析,研究了一种加入直通零矢量的Z源变流器串联双环控制方案,实现了最大功率点跟踪(MPPT)和并网控制.最后,以3 kW的Z源变换器装置进行实验.实验结果验证了该控制方案的正确性.
기우Z원역변기적광복병망계통,기공작특점급공제결구불동우전통적전압형역변기,가이이용역변기교비직통상태실현승압공능,종이만족광복전지전압대범위변화장합하적병망요구.대공제계통진행료상세적설계화분석,연구료일충가입직통령시량적Z원변류기천련쌍배공제방안,실현료최대공솔점근종(MPPT)화병망공제.최후,이3 kW적Z원변환기장치진행실험.실험결과험증료해공제방안적정학성.
The operating character and the control configuration of a grid-connected photovohaie system based on Z-source inverter are different from those of a traditional inverter.The Z-source inverter employs an unique impedance network to couple the inverter main circuit to the diode front end and can be shoot through to boost the DC link voltage.The whole control systems are designed based on analyzing the circuit and systems.By controlling the inhere sine modulation index,the grid-connected current inner loop is adopted to ensure that the system work in unit power factor and the Z-source ca-pacitor voltage outer loop is adopted to ensure the voltage stabilization.By controlling the shoot-through duty cycle,the maximum power point can be traeked.Lastly,a 3 kW Z-source inverter circuit is built and the experimental results com-firm the correctness of the scheme.