Research On Harmonic Suppression And Dynamic Reactive Power Compensation For Wind Power Integration

In modern society,electrical energy plays an important role in industrial and agricultural production and people's daily life.Our country is in the period of rapid development of national economy.The sustainable development of electric energy determines the sustainable development of social economy.Therefore,the stability,safety and power quality of the power grid determine the development of the national economy and people's living standards.Although these devices have improved productivity after they are connected to the power grid,they also bring about power quality problems.On the one hand,the resulting power quality problems will endanger electrical equipment,on the other hand,it will pose a serious threat to the safe and stable operation of the power grid.Therefore,it is of great theoretical significance and engineering value to study the improvement of power quality and the stable operation of the system.Based on the background of wind turbine power generation in Shanghai Zhiyuan Green Energy Co.,Ltd.,this paper studies harmonic generation and suppression in wind power Grid-connected system,and uses appropriate reactive power compensation device to compensate reactive power.Firstly,the construction principle of doubly fed wind turbines is analyzed and modeled,and the main sources and types of harmonics are analyzed.On the basis of the original harmonic detection method,harmonic detection and suppression are carried out by the active filter with dynamic harmonic suppression,and the traditional low-pass filter is replaced by the improved filter algorithm and the average algorithm.Therefore,the accuracy and dynamic response speed of the improved harmonic detection algorithm are greatly improved.And can effectively filter out the ripplegenerated by the system.Based on the improved hysteresis control strategy,the new low-pass filter can achieve the effect of fast compensation for grid-connected harmonic current.The corresponding simulation model is established under the simulation environment of MATLAB/SIMULINK.The improved harmonic detection algorithm and the improved harmonic suppression strategy with PIR resonator control are simulated and analyzed respectively.The simulation results show that the improved harmonic detection algorithm and the improved harmonic suppression strategy can greatly reduce the harmonic distortion rate,meet the requirements of power quality of power grid and thus operate safely and steadily,which verifies the effectiveness of the proposed strategy.Finally,the static var compensator(STATCOM)device is used to compensate the reactive power deficient nodes of the system.The simulation results show that the compensation of the device is remarkable,and the advantages of the device are illustrated.