The Research Harmonic Suppression And Reactive Power Compensation In The Traction Power Supply System

With the continuous development of national economy and industrial technology,our country focuses on energy problem with putting forward the development strategy of the global energy interconnection,including electricity and it affects the national people's livelihood problem directly,the issue of power quality has been payed enough attention to our country.Lots of power electronic devices are invested in the power system,especially using a large amount of non-linear load and variable flow equipment in the high-speed railway.Harmonic pollution is increasingly serious,caused the voltage deviation and waveform distortion,leading to some certain influence in power system.It is positive to study how to suppress the harmonic and reactive power compensation for the stable and economic operation of the high-speed railway.Compensation equipment have been manufactured and invented,such as,Static Var Compensator(SVC),Active Power Filter(APF),Passive Filter(PF)and Railway Power Conditioner(RPC).There are a variety of forms to the Active Filter,while,they both have the same function to restrain harmonic and compensate reactive.Traction power supply system are given in this paper,through the overall structure of compensation device of traction online and CRH2 type electric locomotive load internal research,finally the coordinated control strategy and the performance of the compensation device simulation.In this paper,Conducting further research on the principle of APF,designing the compensation device for CRH2.The parallel APF harmonic and Var current detection method and control method have been studied either.Detection methods are based on the instantaneous reactive power theory.An improved single-phase circuit theory of instantaneous reactive power and harmonic reactive power detection method is carried out.In addition,this paper introduces the detection method based on Fourier analysis.To active filter control strategy,this paper studied the hysteresis control and the H-infinite control principle and method respectively.Both hysteresis control and H-infinite control are used to control the active filter by the strategy of coordinated control.In the end of this paper,CRH2 simulation is carried out and analyzed.In the fourth chapter of this article,as part of AC-DC-AC circuit exists in the CRH2,which rectifier and inverter circuit are analyzed,and established the model respectively.Voltage,current,power factor,active power and reactive power are obtained by simulating and analyzing of the transformer secondary side.Fourier analysis is used to analyze the CRH2 main harmonic frequency.Secondly,in the secondary side of V/x wiring traction transformer,which simulates the catenary end and it's equipped with a parallel active filter.Using thepassive filter to suppress the 3?5?7 harmonics and improve the reactive power cooperatively.Finally,contrast the results and verify the effectiveness of the active filter,and the validity of the coordinated control strategy.