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首页> 外文期刊>Circuits and Systems I: Regular Papers, IEEE Transactions on >Derivation of a Small-Signal Harmonic Model for Closed-Loop Power Converters Based on the State-Variable Sensitivity Method
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Derivation of a Small-Signal Harmonic Model for Closed-Loop Power Converters Based on the State-Variable Sensitivity Method

机译：基于状态变量灵敏度法的闭环功率变换器小信号谐波模型的推导

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摘要

An admittance or impedance matrix of a power converter is highly desirable for harmonic analysis of a power system. However, power converters are inherently nonlinear and time-varying systems. Therefore, a small-signal harmonic model needs to be derived. While there have been many methods to obtain the small-signal models of DC-DC converters, most of these methods cannot be directly applied to AC-DC converters. Moreover, while accurate methods exist for obtaining accurate models of open-loop AC-DC converters, there are few existing methods for obtaining accurate models for closed-loop AC-DC converters. This paper proposes an analytical method for obtaining an accurate small-signal harmonic model for a power converter. The proposed method is based on state-variable sensitivity methods, which have been previously used to derive a transfer function of a DC-DC converter. This paper will show what modifications are required to extend it to derive the small-signal harmonic model of a closed-loop AC-DC converter. A small-signal harmonic model of a closed-loop pulse-width modulated (PWM) voltage source converter (VSC) with synchronous frame current controllers and a dc voltage controller is derived based on the proposed method. The results are in good agreement with large-signal simulations by means of PSCAD/EMTDC.
机译：电力转换器的导纳或阻抗矩阵非常需要用于电力系统的谐波分析。但是，功率转换器本质上是非线性且时变的系统。因此，需要推导一个小信号谐波模型。尽管有很多方法可以获取DC-DC转换器的小信号模型，但是这些方法中的大多数不能直接应用于AC-DC转换器。此外，尽管存在用于获得开环AC-DC转换器的精确模型的精确方法，但是很少有用于获得用于闭环AC-DC转换器的精确模型的现有方法。本文提出了一种用于获得功率变换器的精确小信号谐波模型的分析方法。所提出的方法基于状态可变灵敏度方法，该方法先前已被用于导出DC-DC转换器的传递函数。本文将说明需要进行哪些修改才能将其扩展以得出闭环AC-DC转换器的小信号谐波模型。在此基础上，推导了具有同步框架电流控制器和直流电压控制器的脉宽调制（PWM）电压源转换器（VSC）的小信号谐波模型。结果与通过PSCAD / EMTDC进行的大信号仿真非常吻合。

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