Modal Identification and Analysis of Photovoltaic Converter Based on Random Subspace

doi:10.12096/j.2096-4528.pgt.19141

Abstract

Abstract:

A large number of photovoltaic grid-connection brings many harmonic resonance problems to the power grid. A joint model including photovoltaic converter and grid equivalent impedance was established for the photovoltaic converter resonance problem. The s-domain model of photovoltaic converter impedance and grid impedance was derived. The photovoltaic output current contains not only the voltage frequency component but also the resonant component of the photovoltaic impedance by using the inverse Laplace transform. The stochastic subspace method was used to analyze the modal components of photovoltaic grid-connection points and currents. The impedance modes of photovoltaic converters were extracted according to the difference between the two modes. Finally, the effectiveness of the proposed method was verified by simulation and experimental data analysis.

Key words: photovoltaic, converter, equivalent impedance of power grid, resonance, stochastic subspace, mode

CLC Number:

TK01
TM712

Jianhua ZHU, Zhenqing LI, Lichang XU. Modal Identification and Analysis of Photovoltaic Converter Based on Random Subspace[J]. Power Generation Technology, 2021, 42(2): 201-206.

Figures/Tables 8

Fig.1 Equivalent diagram of the converter integrated into the grid

Fig.2 Node system diagram of a simple equivalent system

Fig.3 System impedance modal calculation process

Fig.4 d-axis current amplitude and frequency diagram

Fig.5 d-axis voltage amplitude and frequency diagram

Fig.6 q-axis voltage amplitude and frequency diagram

Fig.7 Wind farm outlet voltage amplitude

Fig.8 Wind farm outlet current amplitude

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