The Study Of Coordination Control On Electrified Railway Power Quality

Process of electric railway in our country has been for50years, it become thedevelopment direction of railway in China because it has many advantages of low energyconsumption, low operation cost, less environmental pollution. In recent years, thedevelopment of high speed railway make a spurt of progress because of the traction powersupply network has become an important part of power grid. But because the electriclocomotive load is nonlinear and volatility makes it has a great impact on the electric energyquality, harmonic pollution, reactive power insufficiency is becoming more and more serious.Therefore, comprehensive governance of electrified railway power quality is imminent.According to the main circuit structure and working principle of SS6B type electriclocomotive and CRH2EMU, this paper establish the simulation model of electric locomotiveunder mixed running mode (i.e. CRH2EMU and stable operation of SS6B electriclocomotive running on different level), obtained harmonics and reactive power characteristicsof traction substation low voltage side, and provided a fundamental basis for the followingcomprehensive treatment on the power quality.In the light of the characteristics of power quality of the traction power supply system,one power quality comprehensive treatment device is proposed which consists of a passivepower filter, active power filter, static var generator, and the mathematic model of the deviceis established, theoretical analysis is made, provides theoretical support for its feasibility. Theworking principle and the access mode of passive power filter, active power filter wereanalyzed, the mathematical model of static var generator was established and its principle wasanalyzed, each part of the main circuit was designed.This paper proposes a collaborative control strategy according to above studies, and thisstrategy was combined with the power quality comprehensive treatment device. The powerquality characteristics under mixed running mode was given according to establish simulationmodel, after comparative analysis of electric energy quality characteristics, power qualitycomprehensive treatment device based on coordinated control strategy is proved hascharacteristic with feasible and effective.The work of the focus and highlight of this paper consists of3parts. Firstly, this paperbuild the mixed running model based on the main circuit structure and working principle ofSS6B type electric locomotive and CRH2EMU, power quality characteristics are analyzedthrough the simulation of mixed run mode. Secondly, a kind of power quality comprehensivetreatment device was put forward and the feasibility of the device was proved through thetheoretical analysis. Thirdly, this paper proposes a coordination control strategy. The feasibility of the control strategy was proved through the coordination control strategy inpower quality comprehensive treatment device simulation application.