| Electric locomotive auxiliary inverter is one of the important parts ofelectric locomotive, mainly provide a stable three-phase AC380V/50Hz voltagefor air conditioning, traction fans, lighting and power equipments. Itsperformance will directly affect the environmental conditions and performanceof the electric locomotive.Electric locomotive auxiliary power system is a system of variable,non-linear and can not establish a precise mathematical model. And theconventional control schemes are difficult to achieve a waveform with gooddynamic and static characteristics because of the sinusoidal reference signal.Therefore, a multiple control strategy is proposed to improve static stateperformance and dynamic performance.Firstly, the topology of three-phase half-bridge inverter is selected as theinverter main circuit because of the three-phase load asymmetry. The model isestablished. The LC filter is designed and a co-simulation platform is built withthe help of PSIM and MATLAB/Simulink software and it’s the base of fartheranalysis and simulation.Secondly, in view of the problem of input DC voltage fluctuation and lowutilization rate，boost converter is designed. Its model is established and thecompensation network is designed for the boost converter. The simulationresults show that the feasibility of the compensation network.Thirdly, a new multiple control technique based on PI control and iterativelearning control is proposed. The iterative learning controller is used to improvesingle-phase inverter steady-state accuracy and the PI controller is adapted toincrease the dynamic characteristics of the single-phase inverter. The simulationresults show that the output waveform is of good characteristics, such as highsteady accuracy and fast response.Finally, an easy voltage balance control strategy is proposed to solve theproblem of the voltage unbalance of the dc-link capacitor based on the new multiple control technique. The simulation results show that the equalizingeffect is good. |
PDF Full Text Request