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Generalised average modelling of grid-connected three-phase VSC with closed-loop vector control and regular-sampled modulation
IET Power Electronics ( IF 2 ) Pub Date : 2020-09-14 , DOI: 10.1049/iet-pel.2019.1473
Mingzhang Li 1 , Lihui Yang 1 , Xikui Ma 1 , Mengqi Li 1
Affiliation  

Based on the generalised averaging method, a comprehensive mathematical model for a three-phase grid-connected voltage source converter (VSC) with closed-loop vector control and symmetrical regular-sampled modulation is proposed here. The double Fourier series of switching functions is presented to construct the state average vectors in this model. To involve the conventional vector current control strategy, the coordinate transformation method of the state average vector is derived. The multiplication properties are also illustrated to calculate the product average vector for state variables. The proposed model is validated in both MATLAB simulations and hardware experiments. The results show that both the fundamental and the switching behaviours of the converter as well as the closed-loop dynamics of the controller can be accurately demonstrated by the derived model with fast simulation speed. The steady-state harmonic distribution can also be directly achieved by computing the equilibrium point of the system. The proposed model is appropriate for system-level studies of power electronic-based power systems and can provide a beneficial reference for the practical design and the performance assessment of the closed-loop VSC system, which indicates the broad prospect of the application of generalised average models in power system and power electronics fields.

中文翻译:

具有闭环矢量控制和常规采样调制的并网三相VSC的广义平均建模

基于广义平均法,提出了一种具有闭环矢量控制和对称正采样调制的三相并网电压源变换器(VSC)的综合数学模型。在该模型中,提出了双重傅立叶级数的切换函数来构造状态平均向量。针对传统的矢量电流控制策略,推导了状态平均矢量的坐标变换方法。还说明了乘法属性,以计算状态变量的乘积平均向量。该模型在MATLAB仿真和硬件实验中均得到了验证。结果表明,所推导的模型可以快速仿真出转换器的基本特性和开关特性,以及控制器的闭环动态特性。稳态谐波分布也可以通过计算系统的平衡点直接获得。该模型适用于基于电力电子的电力系统的系统级研究,可以为闭环VSC系统的实际设计和性能评估提供有益的参考,为广义均值的应用提供了广阔的前景。电力系统和电力电子领域的模型。稳态谐波分布也可以通过计算系统的平衡点直接获得。该模型适用于基于电力电子的电力系统的系统级研究,可以为闭环VSC系统的实际设计和性能评估提供有益的参考,为广义均值的应用提供了广阔的前景。电力系统和电力电子领域的模型。稳态谐波分布也可以通过计算系统的平衡点直接获得。该模型适用于基于电力电子的电力系统的系统级研究,可以为闭环VSC系统的实际设计和性能评估提供有益的参考,为广义均值的应用提供了广阔的前景。电力系统和电力电子领域的模型。
更新日期:2020-09-15
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