Research And Application Of Hybrid Reactive Power Compensation Based On Switch State Functionalization

At present,the metallurgical industry of our country is developing rapidly in the market.In this situation,the safety and reliability of power supply design play a vital role in maintaining the normal operation of production.Metallurgical industry,however,the bus is short,low reliability and power quality is low.At the same time,electric arc furnaces,lifting and welding equipment,high power nonlinear power electronic devices are widely used in electric power system,which leads to a fall in the grid power factor,voltage fluctuation and so on.Therefore,the efficient utilization of electric energy becomes the focus of research.As one of the effective methods to improve the power quality,the research of reactive power compensation is very necessary.Through the analysis of the above problems,this dissertation puts forward a kind of hybrid reactive power compensation technology based on the functional analysis of the switch state.Among them,the hybrid reactive power compensation system is composed of controlled series compensation(TCSC)and static var generator(SVG),which makes full use of their advantages and makes the supply voltage more ideal.In addition,the switch state functional analysis method uses the close relationship between the switch state and the device working state to fuse the commonality of the circuit’s working principle and control algorithm to minimize the complexity of the research process and obtain the control signal.First of all,this dissertation researches and analyzes the working mechanism of TCSC and SVG hybrid reactive power compensation device respectively,establishes each device model,and determines the compensation size of TCSC and SVG according to the choice of capacity.At the same time,the switching state functional analysis method is introduced to analyze the operating characteristics of the compensation device,and the switching state function of the circuit is deduced,and the drive signal is used to perform on-off control of the switching device of the circuit.Secondly,the hardware circuit design required for the compensation device is completed,including the main circuit,control circuit,voltage/current detection circuit,etc.,whose schematic is also given.Based on the 2812(DSP)development board,the chip ADC input and output channels,sample holders,etc.are introduced,and the software design is designed to give the main program flow chart of the system.Finally,on the basis of theoretical analysis and hardware and software design,using Matlab simulation software to build reactive power compensation device model,the simulation study to observe the circuit voltage and current and phase conditions,verifies the effectiveness of the switch state function.In addition,an experimental platform is set up to carry out system software hardware debugging and experimental verification.It is found that the application of the hybrid reactive power compensation device reduces the voltage and current phase difference in the circuit,and the reactive power is effectively compensated,which is a good proof of the effectiveness of the switch state functional analysis method in the hybrid reactive power compensation circuit and the correctness of the model.