光伏电源友好并网系统及其仿真研究

为提高主电网电能质量,对光伏电源并网逆变器及其控制方法进行研究和仿真。该逆变器采用DC/DC+DC/AC的双级结构,以三相瞬时无功理论为基础,将光伏并网逆变器与有源滤波器相结合,使得光伏电源不仅可以输出有功功率,还能进行无功和谐波补偿,实现友好并网。其DC/DC部分采用Boost升压电路,通过电导增量法进行最大功率跟踪(MPPT); DC/AC部分采用电压型三相桥式逆变电路和滞环控制方法。最后给出了较详细的仿真结果,验证了所采用方法的可行性。

Photovoltaic Generator Grid-Friendly Connection System and Simulation Study

A new type of inverter for grid-friendly connection of photovoltaic generator is studied and simulated to improve power quality of the main grid. The inverter system makes use of a two-level DC/DC and DC/AC structure and utilizes three-phase instantaneous reactive power theory to detect reactive power and harmonic currents. The inverter is combined with Active Power Filter(APF) to not only produce active power but also compensate reactive power and harmonics, enabling grid-friendly interconnection. The DC/DC circuit of the inverter system uses boost circuit and performs maximum power tracking based on the conductance increment method. The DC/AC circuit of the system uses three-phase bridge voltage inverter circuit and hysteresis control method. Finally, the simulation model and simulation results are provided to verify the feasibility of the proposed grid-friendly connection inverter for photovoltaic.