A Simplified Wide-Bandwidth Generalized Impedance Model for Single-Phase Grid-Connected Inverter in Polar Coordinate System

2019 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) Pub Date : 2019-12-01 DOI:10.1109/APPEEC45492.2019.8994647

Yuancan Xu, Yandong Chen, Wenhua Wu, Zhiwei Xie, Lu Xie, Jingming Liu, Shang Peng

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Abstract

With the continuous expansion of new energy grid-connected power generation, the utilization of a large number of power electronic inverters results in the aggravating interaction between new energy power generation and the grid, which led to critical wide-bandwidth oscillation. Therefore, this paper proposes a simplified wide-bandwidth generalized impedance model by modeling the single-phase grid-connected inverter in the polar coordinate system. Firstly, the small-signal dynamic model of the inverter in the polar coordinate system based with second-order generalized integrator (SOGI) is obtained. Then a frequency division basis of 10 Hz to 1 kHz is proposed because the dynamic response of each link varies with frequency. Finally, generalized impedance models of the inverter in the different frequency band are established respectively. The good agreement of the simulation result and the theoretical model verifies the feasibility and correctness of the model. The proposed model lays a good foundation for wide-bandwidth modeling of the three-phase system.

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极坐标下单相并网逆变器宽带广义阻抗简化模型

随着新能源并网发电规模的不断扩大，大量电力电子逆变器的使用，导致新能源发电与电网的相互作用加剧，导致临界宽带振荡。因此，本文通过在极坐标系下对单相并网逆变器进行建模，提出了一种简化的宽带广义阻抗模型。首先，建立了基于二阶广义积分器(SOGI)的极坐标系下逆变器的小信号动态模型;然后，由于各链路的动态响应随频率变化，提出了10hz ~ 1khz的分频基础。最后，分别建立了逆变器在不同频段的广义阻抗模型。仿真结果与理论模型吻合较好，验证了模型的可行性和正确性。该模型为三相系统的宽带建模奠定了良好的基础。

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2019 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

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