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三相VSG系统的高性能非线性控制策略

DOI: 10.13334/j.0258-8013.pcsee.2014.06.006, PP. 863-871

Keywords: 电压跌落发生器,脉宽调制整流器,完全反馈线性化,非线性控制,反馈调节

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Abstract:

为了提高电压跌落发生器在逆变侧模拟电网跌落故障时整流侧的响应速度,提出一种基于非线性控制的高性能控制策略。通过将引入的相对阶为2的能量函数与无功电流分量作为输出,在没有简化模型的基础上实现对三相脉宽调制(pulsewidthmodulation,PWM)整流器这一欠驱动系统的完全精确反馈线性化,避免了系统的零动态响应。在能量函数的基础上增加一个反馈调节控制,提高控制系统抵抗模型参数不确定性时的鲁棒性。此外,针对电压跌落发生器(voltagesaggenerator,VSG)的逆变侧,根据三相电压矢量关系图,设计一种简单实现平衡跌落与部分不平衡跌落故障的开环控制器。仿真对比及实验结果表明,所提控制策略能够提高VSG系统在电压跌落时的动态响应速度,保证直流母线电压的快速稳定调节,同时使网侧单位功率因数运行,具有显著的优越性。

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