Study On Control Strategy And Design Of High Power Charger

As the environmental pollution and energy shortage is more serious, the development of green energy saving electric vehicle is imperative. High power charger is a kind of nonlinear load. At the same time, the high power output is selected by the multi power supply module, and it is difficult to ensure the current balance of each module. Therefore, it is very important to study the harmonic suppression strategy and parallel current sharing strategy for high power charger.In this thesis, a three-phase controlled rectifier is used as the main circuit of the rectifier, by changing the topology of the main circuit and the application of PWM rectifier technology, the design of a Charger for three-phase bridge voltage type PWM rectifier. In the aspect of control strategy, it aimed at harmonic pollution produced by the proposed charger, a feedforward decoupling control strategy combined with space vector pulse width modulation (PWM) is proposed as a harmonic suppression strategy; On the basis of the average load current sharing among the modules, and considering the characteristics of the redundancy, this Thesis presents a software flow sharing strategy based on the redundant bus. In the aspect of hardware circuit design, the main circuit system, the microprocessor and peripheral circuit, voltage and current sampling circuit and the battery temperature sampling circuit; in the aspect of system software design, design to based on the C language, gives the main program and parallel flow charging flow chart.In this thesis, the system model is established by using MATLAB/Simulink simulation platform, and the rationality of network parameters design is verified. To build an experimental platform of the lOkW module, the power module of the dynamic performance and parallel flow were analyzed, the results show that the precision of voltage less than 0.92%, the steady precision of less than 1.5%,efficiency higher than 90.9% and not less than 4.6% degree of balance, have reached a high power charger design goal.