Harmonic Oscillations in a Grid-Connected PV Generation Farm Caused by an Increased Number of Parallel-Connected PV Generating Units and Damping Controllers

Wenjuan Du; Zhicheng Ma; Yang Wang; H. F. Wang

doi:10.17775/CSEEJPES.2020.02790

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Harmonic Oscillations in a Grid-Connected PV Generation Farm Caused by an Increased Number of Parallel-Connected PV Generating Units and Damping Controllers

Regular Papers | 更新时间：2026-10-15

- Harmonic Oscillations in a Grid-Connected PV Generation Farm Caused by an Increased Number of Parallel-Connected PV Generating Units and Damping Controllers
- CSEE Journal of Power and Energy Systems Vol. 10, Issue 6, Pages: 2350-2359(2024)
- 作者机构：
  
  1. School of Electrical Engineering, Sichuan University,Chengdu,China
  2. Electric Power Research Institute, State Grid Gansu Electric Power Co., Ltd.,Lanzhou,China
- 作者简介：
- 基金信息：
- DOI：10.17775/CSEEJPES.2020.02790
  CLC：
- Published：01 November 2024
- 稿件说明：
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Wenjuan Du, Zhicheng Ma, Yang Wang, et al. Harmonic Oscillations in a Grid-Connected PV Generation Farm Caused by an Increased Number of Parallel-Connected PV Generating Units and Damping Controllers[J]. CSEE Journal of Power and Energy Systems, 2024, 10(6): 2350-2359.
DOI：

Wenjuan Du, Zhicheng Ma, Yang Wang, et al. Harmonic Oscillations in a Grid-Connected PV Generation Farm Caused by an Increased Number of Parallel-Connected PV Generating Units and Damping Controllers[J]. CSEE Journal of Power and Energy Systems, 2024, 10(6): 2350-2359. DOI： 10.17775/CSEEJPES.2020.02790.

摘要

Abstract

This paper examines the harmonic oscillations in a grid-connected PV generation farm (PVGF) caused by the parallel connection of an increased number of PV generation units (PVGUs). An equivalent model of the grid-connected PVGF is derived

which clearly explains why there are internal and external oscillation modes in the grid-connected PVGF. An indicator of impedance multiplication (IIM) is proposed to quantitatively estimate the impact of the increased number of PVGUs in parallel connection. The analysis in this paper reveals the mechanism about why the damping of external oscillation modes may decrease when more PVGUs are in parallel connection under the condition that the IIM is positive. An example grid-connected PVGF is presented in this paper to demonstrate and evaluate the derived analysis and conclusions. A method for designing the damping controllers to ensure a negative IIM is proposed. With the damping controllers being installed

the risk of growing harmonic oscillations caused by the increased number of the PVGUs in parallel connection can be effectively eliminated.

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references

17. W. K. Dong, W. J. Du, and H F Wang, Research on dynamic equivalent model of a grid-connected wind farm for oscillation stability analysis, [Online ] . in Proceedings of the CSEE , p. 1–14 ( 2020-06-30 ) [ 2020 - 08 - 06 ] . [Online ] . Available: https://doi.org/10.13334/j.0258-8013.pcsee.191942.

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