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三相PWM整流器模型预测虚拟电压矢量控制

DOI: 10.13334/j.0258-8013.pcsee.2014.18.008, PP. 2926-2935

Keywords: 三相PWM整流器,模型预测控制,虚拟电压矢量,控制集拓展,功率脉动抑制

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Abstract:

传统的模型预测控制(modelpredictivecontrol,MPC)在一个控制周期内仅可输出单一的离散电压矢量,考虑到变流器拓扑可提离散电压矢量的局限性,三相脉宽调制(pulsewidthmodulation,PWM)整流器存在较大的稳态功率脉动。在分析三相PWM整流器离散预测模型的基础上,提出一种模型预测虚拟电压矢量(modelpredictivevirtualvoltagevectors,MPV3)控制方法,通过构建6个虚拟的电压矢量代替传统MPC中的8个离散电压矢量,旨在拓展系统的控制集覆盖范围。首先,根据最近三矢量原则确定构建虚拟电压矢量所需的离散电压矢量,接着以功率无差拍跟踪控制为指标在线求取各离散电压矢量作用时间。为了保证虚拟电压矢量的可实现性,构建相应的目标函数进行矢量作用时间的可行性判断和动态修正。最后,为验证所提MPV3方法的可行性和有效性,分别与传统MPC和占空比优化进行仿真和实验的对比分析,并进一步归类总结出各方法的优缺点及适用范围。

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