Research And Practice On Load-Side Hybrid Reactive Power Compensation With Short Bus

As an important part of China's industry,after the development of recent years,the metallurgical industry has become a trend of rapid growth.The main energy used in metallurgy is electric energy.Therefore,the quality of power will directly affect the normal production and operation of the metallurgical industry.The requirement of electric energy in metallurgical industry is high,and the main characteristics are flexible,safe and reliable.According to the characteristics of metallurgical industry,it is difficult to adjust the reactive power of connecting its power supply bus.With the rapid development of electronic technology,reactive power compensation is also attached great importance to by both suppliers and recipients.The reactive compensation is mainly composed of the series compensation and the parallel compensation.The metallurgical enterprises generally use short-range generatrix.According to the characteristics of the power demand of the metallurgical enterprises,this dissertation makes a comprehensive compensation based on the characteristics of the power demand of the metallurgical enterprises and the characteristics of the compensation,so as to be suitable for the short-distance bus power supply mode of the metallurgical industry.Thyristor Controlled Series Capacitor(TCSC)and Static Var Compensator(SVC)have their own advantages and disadvantages.The advantages of the two are fully combined,and a great effect can be exerted.Through the experiment,the problem of three-phase imbalance can be improved by using the method of joint compensation,and the defect of low amplitude can also be solved well,and a more reliable voltage can be obtained.In this dissertation,a joint hybrid compensation device is proposed to control the trigger angle of the device in order to realize the continuous adjustment of the capacitive reactance.The main work and achievements of the dissertation are as follows:Firstly,based on the analysis of the working principle and basic impedance characteristics of the controllable series compensation device(TCSC)and the static reactive power compensation device(SVC),the joint compensation device of TCSC and SVC is designed,the related model is established,the impedance characteristics are analyzed,and the control method is designed.Finally,the reactive current detection method is given.Secondly,on the basis of designing the overall structure of hybrid reactive power compensation device,the main circuit,power supply and control circuit hardware circuit are designed,and TMS320F2812 DSP is used as CPU,the program block diagram is given,and relevant software is designed and developed.Finally,the simulation system of SVC(TCR)single-phase,controllable series compensation(TCSC)compensation and parallel compensation(SVC),hybrid reactive power compensation device is constructed in Matlab7.1 simulation software,and the dynamic compensation characteristics of hybrid reactive power compensation device are studied.The simulation results show that the hybrid reactive power compensation device can optimize the reactive power compensation to the greatest extent,so as to realize dynamic compensation and finally improve the power factor.