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Dc voltage sensorless control method for three-phase grid-connected inverters

机译:三相并网逆变器的直流电压无传感器控制方法

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A novel dc-link voltage sensorless technique for a three-phase grid-connected inverter is presented. Based on predictive and real-time sampling schemes, the required pulse width modulation (PWM) output voltage vector is accurately predicted by measuring the grid voltage and the inverter output current. A q-axis current proportional-integral (PI) controller is also used. The controller forces the output current to accurately follow its reference, and is also used to derive the dc-link voltage. By using this method, the dc-link voltage is not obtained from a voltage sensor, but instead is obtained from inverter output current information. Test results show that the output current of the resultant inverter is of high quality at steady state and can follow its reference quickly in dynamic states as well.
机译:提出了一种新型的三相并网逆变器直流环节电压无传感器技术。基于预测和实时采样方案,通过测量电网电压和逆变器输出电流,可以准确预测所需的脉宽调制(PWM)输出电压矢量。还使用q轴电流比例积分(PI)控制器。控制器强制输出电流准确遵循其参考值,并且还用于导出直流母线电压。通过使用这种方法,直流母线电压不是从电压传感器获得的,而是从逆变器输出电流信息获得的。测试结果表明,所得逆变器的输出电流在稳态下是高质量的,并且在动态状态下也可以快速遵循其参考值。

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  • 来源
    《Power Electronics, IET》 |2010年第4期|P.552-558|共7页
  • 作者

    Wang Z.; Chang L.; Mao M.;

  • 作者单位

    Department of Electrical and Computer Engineering, University of New Brunswick Fredericton, NB,Canada;

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