A Modified DQ Impedance Model of Three-Phase Grid-Connected Inverter-Grid System Considering Coupling between Inverter and Grid

2020 IEEE Applied Power Electronics Conference and Exposition (APEC) Pub Date : 2020-03-01 DOI:10.1109/APEC39645.2020.9124173

Weihua Zhou, Yanbo Wang, R. Torres-Olguin, Dong Liu, Zhe Chen

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引用次数: 1

Abstract

This paper presents a modified dq impedance model of the three-phase voltage source grid-connected inverter (GCI)-grid system considering coupling effect between GCI part and grid part for small-signal stability analysis. Steady-state terminal voltage and current information of the GCI part which are necessary in conventional dq impedance modelling methods are calculated based on grid parameters, i.e., grid voltage and grid impedance, and current references of current-controlled GCI or power references of power-controlled GCI. In addition, effects of dynamics of grid voltage and phase-locked loop (PLL) on dq impedance characteristics of grid part are also investigated, which enables the modified dq impedance model of grid part to relate with that of GCI part. The modified dq impedance model of the GCI part which takes the effects of grid voltage and grid impedance into account need not know steady-state terminal voltage and current information. In addition, the modified dq impedance model of grid part may provide accurate stability analysis during grid voltage changes. The insight of instability mechanism of the GCI-grid coupling system may be facilitated using the modified dq impedance models. Simulation results are given to validate correctness of the proposed dq impedance model of the GCI-grid system, and effectiveness of the dq impedance model for stability analysis.

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考虑逆变器与电网耦合的三相并网逆变器-电网系统改进DQ阻抗模型

本文针对三相电压源并网逆变器(GCI)-电网系统的小信号稳定性分析，提出了一种考虑GCI部分与电网部分耦合效应的改进dq阻抗模型。传统dq阻抗建模方法中需要的GCI部分的稳态端子电压和电流信息，是基于栅格参数，即栅格电压和栅格阻抗，以及电流控制GCI的电流参考或功率控制GCI的功率参考来计算的。此外，还研究了电网电压和锁相环(PLL)的动态变化对电网部分dq阻抗特性的影响，使改进后的电网部分dq阻抗模型与GCI部分的dq阻抗模型相吻合。考虑栅极电压和栅极阻抗影响的改进GCI部分dq阻抗模型不需要知道稳态端电压和电流信息。此外，改进后的电网部分dq阻抗模型可以提供准确的电网电压变化时的稳定性分析。修正后的dq阻抗模型有助于深入了解gci -电网耦合系统的失稳机理。仿真结果验证了所建gci电网系统dq阻抗模型的正确性，以及dq阻抗模型用于稳定性分析的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2020 IEEE Applied Power Electronics Conference and Exposition (APEC)

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