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基于负阻抗补偿法的调速系统阻抗特性分析

, PP. 50-56

Keywords: 调速系统,负阻抗补偿法,输入导纳,稳定性,电流瞬变

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Abstract:

采用高压直流电源供电的多电飞机,恒功率负载大量增加,可能会引起电网电流或电压的谐振,对供电系统的电能质量、稳定性有严重的危害。在用电设备的设计中,首先应保证供电网络的稳定性,在此基础上,还应使电压瞬变和电流瞬变控制在一定的范围内。该文推导采用负阻抗补偿法的直流电网导纳模型,分析其频率特性及负载特性。与传统增大滤波电容法相比,负阻抗补偿法可明显减小谐振幅值,缩短谐振时间,又不依赖于电源内阻。同时分析负阻抗补偿引起的电机启动时的电流瞬变特性,改进电机控制系统的电流限幅方法。通过闭环调速系统的仿真和实验,验证补偿器的设计性能在保证稳定性的同时,可以满足电网瞬变要求。

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