Research And Practice Of Demand-side Hybrid Reactive Power Compensation Based On Power Electronic Devices

With the continuous development of the power industry,the consumption of reactive power in the power grid is increasing day by day,which seriously threatens the safe and stable operation of the power grid.Dynamic continuous reactive power compensation for power system is an effective method to reduce the adverse impact of reactive power on the power grid.It is of great significance to improve the power supply capacity of the system,and has become a hot topic in the field of power research in recent years.Therefore,TCSC and TCR SVC hybrid reactive power compensation device is proposed in this paper to expand the compensation capacity and adjust the reactive power balance of the system at the same time.Firstly,this paper analyzes and studies the research background and the development and application status of reactive power compensation technology,and summarizes the advantages and disadvantages of series and parallel compensation and the development status of hybrid compensation devices.Secondly,the basic structure and working principle of hybrid reactive power compensation are described.The operation characteristics of hybrid reactive power compensation are illustrated with TCSC and TCR SVC as representatives.The functional relationship between power factor and thyristor trigger Angle is analyzed,and the relationship curve is obtained by Matlab programming.Then,the detection method based on hybrid reactive power compensation characteristics is studied,and p-q detection method,ip-iq detection method and d-q detection method based on instantaneous reactive power theory are introduced.The d-q detection method without calculating instantaneous active and reactive power and effectively separating components is selected.A power factor control strategy based on multi-level agent coordination control is proposed for hybrid compensation system.Then,the circuit design of hybrid reactive power compensation device is completed,including the calculation of compensation capacity and the selection of main circuit parameters,hardware circuit design and software design.Finally,on the basis of theoretical analysis and software and hardware design,the model of reactive power compensation device was built with Matlab simulation software,and the simulation results and waveforms of TCSC,TCR SVC and their hybrid reactive power compensation were analyzed,and verified by building an experimental platform.The experimental results show that the hybrid reactive power compensation device can complete the continuous compensation of reactive power,improve the static and dynamic stability of the system,and achieve the expected compensation effect.