作　　者： ; ; ; ; ;

机构地区： 清华大学电机工程与应用电子技术系

出　　处： 《电工技术学报》 2006年第1期28-32,共5页

摘　　要： 随着光伏发电技术的推广应用,具有无功补偿功能的光伏并网系统对于减轻电网负担、改善供电质量具有重要意义。本文提出了一种具有无功补偿功能的单级式三相光伏并网系统。该系统实时检测太阳能电池输出电压和电流、电网电压和负载电流,在实现太阳能电池最大功率点跟踪(MaximumPowerPointTracking,MPPT)的同时,还能够实时补偿本地负载的无功电流。由于采用了改进的干扰观测法,MPPT算法的稳定性得到了改善;在逆变控制中应用了单周期控制(One-CycleControl,OCC)PWM算法,从而提高了控制精度,减小了输出电流的纹波含量。文中给出了仿真和实验结果,验证了设计的合理性。 Electricity from decentralized grid-connected photovoltaic （PV） systems is becoming important constitution of the electric power system. Grid-connected PV system with reactive power compensation can reduce electric network load and improve power system stability. This paper proposes a single-stage three-phase grid-connected PV system with reactive power compensation, which can track maximum power point of- PV panels and compensate reactive power of local load simultaneously by detecting PV output voltage and current, grid voltage and load current. A modified maximum power point tracking （MPPT） strategy is also presented in this paper, which can improve the stability of the single-stage grid-connected PV system during rapidly changing process of light intensity One-cycle control （OCC） method is employed to reduce harmonics in the output current of the inverter. Simulation and experimental results were carried out to verify the proposed method.

关 键 词： 太阳能 光伏 并网 无功补偿

领　　域： [电气工程]