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静止坐标系下电流型PWM整流器电流环控制策略研究及其参数设计

DOI: 10.13334/j.0258-8013.pcsee.2014.15.004, PP. 2353-2361

Keywords: 电流型PWM整流器,比例谐振,滞后补偿,有源阻尼,稳定性

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Abstract:

通过分析三相脉宽调制电流型整流器(currentsourcerectifier,CSR)在两相静止坐标系中的数学模型,利用瞬时功率理论建立电压定向的CSR功率控制策略。为了有效抑制整流器输入侧LC滤波器产生的并联谐振,文中引入电容电压反馈有源阻尼控制环路。采用频域法对电流内环开环传递函数进行研究,针对静置坐标系下电流内环在动态响应和稳定性方面的限制,提出电流内环级联滞后补偿控制方法。详细研究电流内环比例谐振控制器及各参数对其性能的影响,并根据性能指标要求确定系统参数。利用根轨迹分析滤波电感变化对电流内环稳定性影响,并明确有源阻尼反馈增益与系统鲁棒性的关联性,最后对控制器进行离散化处理以实现数字控制。仿真和在60?kVA三相CSR样机实验结果表明,所提出的控制方法能够实现良好的动、静态性能,单位功率因数以及有效抑制网侧电流畸变。

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