斩波串级调速系统逆变侧电子保护电路的研究与设计

根据常规斩波串级调速系统的拓扑结构,分析了调速设备故障时接触器保护在动作保护过程中主回路的暂态过程。由于接触器动作时间较长,在其动作期间调速设备易受到高电压、大电流的冲击,导致电力电子器件损坏。针对接触器保护的弊端,设计了带电子保护电路的主回路拓扑结构。并分析了高压失电工况下常规的和带电子保护电路的斩波串级调速系统的暂态过程,同时进行详细的理论推导,得出高压失电工况下理论分析的依据。最后在模拟带载试验平台上分别对常规斩波串级调速系统和增加电子保护电路的调速系统在高压失电的工况下进行测试。测试结果表明理论计算与实际测量值基本一致,同时验证了电子保护电路有效解决了有源逆变结构下的高压失电或者逆变颠覆的问题。

Research and design on inverter side electronic-protection circuit of chopper cascade speed system

According to the topology of conventional chopper cascade speed system, this paper analyzes the transient process of main loop of contactor protection when device failure. Because the contactor action requires a longer time, equipment is vulnerable to the impact of high voltage, high current during the contactor action, and cause damage to power electronic devices. For contactors and fast-cut protection drawbacks, the main circuit topology with electronic protection circuit is designed. Then transient process of conventional chopper cascade speed system and chopper cascade speed system with electronic protection circuit under high voltage power failure conditions are analyzed, and theoretics is detailedly deduced. The basis of theoretical analysis under high-voltage power failure condition is got. Finally, the conventional chopper cascade speed control system and with electronic protection circuits for high-voltage power failure conditions are tested on the simulated load test platforms. Experimental results show that the theoretical calculation is consistent with the actual measured values, and verify that electronic protection circuits effectively solve the problem of high-voltage power failure and inverter subversion under active inverter structure.