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大功率全数字化开关充电机的研究与实现-电力电子与电力传动专业论文
some factors like cost, EMC and efficiency into account, some relevant schematics and PCBs are drawn.
Software design of switching mode charge constitutes software design objectives and arrangements of the program structure and the design of major functional modules. The major functional blocks includes the incremental PID control subroutine, the Modbus communication protocol subroutine, data acquisition and processing subroutine, charging process control subroutine, HMI subroutine, fault handling subroutine. By using mixed C and Assembly Language programming method, the whole program’s edit, compilation and debugging are completed.
System debugging of switching mode charger is described. In the different stages of hardware circuit design, the corresponding control procedures are developed and debugged step by step. Eventually the whole program’s compilation and debugging are completed. A number of problems, such as jitterring elimination of the keyboard, PID control parameters matching, and so on, are encountered and solved during debugging the system. The prototype of a novel 30 kW high-power full-digital switch-mode charger, with on-line monitoring function, is produced and experimented in some coal mines. The measured results show that the charger has good effects satisfying the purpose of the design.
Improvement of the input power factor of switching mode charger is designed. Since charger’s power is high enough, the various methods relevant to the existing three-phase converter power factor correction and the criteria IEC61000-3-12 with phase current larger than 16A, are analysed. On the basis of the analysis, a new magnetic energy recovery switch (MERS) series compensation technology is chosen in order to correct the power factor of three-phase uncontrollable rectifier. The working principle of MERS is described, involved some problems such as non-chopping, PWM chopping and dead zone handling. Moreover related simulation analyses and experimental researches
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