Research On Wind Turbine Model And Power Quality Control Based On STATCOM Used In Wind Farm

With the continuous development of economy and society,human demand for energy is increasing,energy depletion and environmental pollution problems of petroleum,coal,natural gas and other traditional energy has become an important factor restricting economic development throughout the world.Wind energy as a new energy,with its clean,efficient and other characteristics of the power to become the best strategic choice for sustainable development.At present,wind power has more than oil,coal and natural gas to become the world's most rapid development of energy and electricity market,one of the most rapid development of renewable energy.Countries around the world adopt a variety of ways to actively encourage and support the development of wind power technology.Therefore,it has important theoretical significance and practical value to carry out wind energy utilization and related technology research.Establishing the mathematical model of wind turbine is the basis of research and analysis of the performance and design of the control system of wind turbine generator.Doubly fed induction generator based on current in the wind farm mainly used(DFIG)and direct drive permanent magnet wind generator(PMSG)as the research object,establishes the mathematical model of doubly fed induction generator and permanent magnet direct drive generator.On the basis of the above model,the PowerFactory DIgSILENT simulation software is used to simulate the double fed induction generator.The XD-9600 model is established and simulation function produced by Xiangtan Hunan electric wind energy company's permanent magnet direct drive wind turbine as an example,the paper gives including pitch control,maximum power tracking control,full power converter control decoupling control system modeling process in detail.In the simulation process with infinite voltage source as an example,verify the effectiveness of vector control and feedforward compensation method,the real machine side converter and grid side converter and reactive power decoupling control,and the model of three-phase short-circuit fault to verify system performance.The simulation results verify the feasibility and correctness of the model and control system.STATCOM in the wind farm can effectively control the voltage fluctuation,harmonics and other power quality problems.This paper established a STATCOM control system for a wind farm model to improve the transient voltage stability and power quality improvement,proposed using a STATCOM and induction filter tuning branch in parallel model of wind power grid system.In order to verify the feasibility of the control strategy of STATCOM and the new wind power grid system and the effectiveness of the wind farm by using STATCOM simulation analysis,the simulation results show that the wind power grid system can improve the transient voltage stability of the access point has a good inhibitory effect on harmonic.