光伏发电系统三相逆变并网及其仿真研究

Three-phase Grid Connection of Photovoltaic Power Generation System and Its Simulation Research

目的太阳能由于其清洁、可再生等诸多优点被全世界广泛关注。光伏发电能够节能减排、降低能耗,是目前电力专家认为的最重要的新能源模式之一。光伏发电最重要的是电网并网输电,光伏发电器件把太阳能转换成的电能通过逆变器进行逆变并网发电。构建光伏发电逆变并网仿真技术,通过仿真复现实际的发电系统,在仿真系统中得到实际系统的某些参数和解决故障方案。方法对三相并网系统进行分析和仿真。采用三相结构,并建立该结构的仿真模型,利用变换和锁相环技术对并网时的电压幅值、频率以及相位进行跟踪。结果结果表明,研究的三相逆变并网仿真模型能够实现逆变器侧的线电压对电网侧的线电压的信息跟踪,对逆变器输出的三相波形的矫正效果良好。结论构建的光伏发电逆变并网仿真技术能够保证顺利并网,并尽可能避免各种故障的发生。

Objective Solar energy has attracted worldwide attention due to its clean,non-polluting,renewable and many other advantages.Photovoltaic power generation can save energy,reduce emissions and reduce energy consumption,which is one of the most important new energy modes considered by power experts at present.The most important thing of photovoltaic power generation is grid-connected power transmission.Photovoltaic devices convert solar energy into energy through inverters for grid-connected power generation.To ensure the smooth grid connection and avoid all kinds of faults as far as possible,the grid-connected simulation technology of photovoltaic inverters was constructed here.By the simulation of the actual power generation system,some parameters of the actual system and solutions to the faults were obtained in the simulation system. Methods Three-phase grid-connected system was analyzed and simulated.The three-phase structure was adopted and the simulation model of the structure was established in it.Voltage amplitude,frequency and phase of grid-connected system were tracked by the use of transformation and phase-locked loop technology. Results The simulation results showed that the three-phase inverters grid-connected simulation model can realize the information tracking of the line voltage of the inverter side to the line voltage of the grid side,and the correction effect of the three-phase waveform of the inverter output is good. Conclusion The grid-connected simulation technology of photovoltaic inverters can ensure the smooth grid connection and avoid all kinds of faults as far as possible.