Optimization Design Of Power Battery Maintenance Equipment

With the rapid consumption of oil resources, pure electric vehicle draws wide attention. Power storage batteries which performance will slide down significantly in use process are the power source of the electric car. So it is necessary to periodically test and maintain batteries performance.Comparing the imported equipment and existing10kW battery maintenance equipment, there is certain disparity in control precision and volume. In view of most imported equipment is used channel parallel structure, realizing lOkW battery maintenance equipment parallel operation is a feasible scheme to increase capacity.The control system of existing10kW battery maintenance equipment is optimized in this paper. The existing10kW battery maintenance equipment consist of PWM rectifier and Bi DC/DC converter which have independent control system, so it is necessary to optimize control system of two module respectively. The PWM control system is optimized by add a repetitive controller to improve AC current and reduce current THD. The parallel function is added in DC/DC control system, which apply the maximum current automatic current sharing method. The structure of DC/DC control system is current, voltage and current sharing three loop control structure. The Bi DC/DC parallel control system hardware is designed which based on UCC39002current sharing chip. And the parallel system Matlab/Simulink simulation model and parallel experiment platform is built. Experimental results show that using new PWM rectifier control strategy system AC current THD reduce3.4%in full load and parallel of equipment is realized with current sharing error is no more than3.?%which satisfy the design requirements.