CAJ | 학술논문

针对光伏电池工作时受光照强度、环境温度影响而导致输出电压具有较大波动性这一问题，构建了一种基于准Z源逆变器的光伏并网系统，并采用两级自然坐标控制，通过调节准Z源逆变器的直通占空比来控制直流侧电压稳定；同时，在abc自然坐标下实现对准Z源逆变器的有功和无功的独立控制，避免了参数不准确导致的电流解耦不彻底。对运行中出现的光伏电源输出波动进行的仿真和dSPACE实时控制实验表明，采用该控制策略的基于准Z源逆变器的光伏并网系统能有效抑制光伏电池输出电压波动对并网的影响，向电网输入更高质量的电能。
침대광복전지공작시수광조강도、배경온도영향이도치수출전압구유교대파동성저일문제，구건료일충기우준Z원역변기적광복병망계통，병채용량급자연좌표공제，통과조절준Z원역변기적직통점공비래공제직류측전압은정；동시，재abc자연좌표하실현대준Z원역변기적유공화무공적독립공제，피면료삼수불준학도치적전류해우불철저。대운행중출현적광복전원수출파동진행적방진화dSPACE실시공제실험표명，채용해공제책략적기우준Z원역변기적광복병망계통능유효억제광복전지수출전압파동대병망적영향，향전망수입경고질량적전능。
Due to the changes of illumination and temperature, the output voltage of the photovoltaic cells fluctuates largely. To solve this problem, an grid-connected system based on quasi-Z-source in-verter is constructed and natural coordinate control is applied to this system. The voltage of DC side maintain stable by adjusting the shoot-through duty cycle of quasi-Z-source inverter. Meanwhile, the independent control for active and reactive power is implemented in the abc natural coordinate, by which the uncompleted current decoupling caused by inaccurate arguments is avoided effetely. Simu-lation and dSPACE experiments on the situation of the photovoltaic power supply output fluctuations are carried out. The result shows that the grid-connected system based on quasi-Z-source inverter a-dopting the control strategy can effectively inhibit the influences to grid-connection caused by the output voltage fluctuations of the photovoltaic cells and supply high-quality power to grid.