Fuzzy Adaptive Control Strategy Of Direct Drive Permanent Magnet Synchronous Wind Power System

Wind power generation is an important part of renewable energy power generation, the rapid development of wind power system is beneficial to the adjustment of energy structure and sustainable development strategy. In this paper, the direct drive permanent magnet synchronous generation(PMSG) system is the research object, and the nonlinear control strategy and reactive power compensation control strategy of PMSG are studied.The mathematical model of wind speed and PMSG are established, the working characteristics of wind speed and wind turbine are studied by the simulation model, and the operating characteristics of wind turbine at different operating stages are analyzed. According to the control target of the grid-side and the machine-side converter, the both control strategies are studied, the parameters of the outer loop and inner loop are designed by the typical I and II system. Independent operation of grid-side converter(GSC) and machine-side converter(MSC) are researched under voltage reference value and load step change and different wind speeds conditions.In order to overcome the shortage of the linear PI controller, the fuzzy adaptive PI control strategy is proposed, the basic principle and structure of fuzzy control are analyzed. The selection principle of the domain, membership function and fuzzy rule table is given. The effectiveness of fuzzy adaptive PI control strategy is verified by comparing with the simulation results of the traditional PI and fuzzy adaptive PI control strategy. When the grid side reactive power demand exceeds the scope of the PMSG system, the reactive power compensation device is needed to improve the grid power factor and PCC voltage stability. In order to deal with the problem, the SVG reactive power compensation device is appied, the basic principle and control strategy of SVG are given, the simulation model is built by simulation software, and the effectiveness of control strategy is verified by comparing with the simulation results.A 500 W hardware experimental platform is built, the control algorithm is realized by DSP TMS320F2812, the experimental procedure of traditional PI and fuzzy adaptive PI control strategy is writed by C language in CCS compiling environment. The experimental studies are carried out for hardware platform of 1.5MW and 500 W PMSG, and the experimental data were analyzed by MATLAB software. The experimental results show that the fuzzy adaptive PI control has better dynamic performance.