Research on Subsynchronous Oscillation of Photovoltaic and Battery Storage Systems Integrated to Weak Grid

2020 4th International Conference on HVDC (HVDC) Pub Date : 2020-11-06 DOI:10.1109/HVDC50696.2020.9292686

Ming Yi, Yunhui Huang, Dang Zhu

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Abstract

This paper investigates the subsynchronous oscillation of photovoltaic(PV) and battery storage systems integrated to weak grid. In order to analyze the subsynchronous oscillation of the systems, a small signal model of the PV and battery storage systems is established. Based on the model, the effects of control parameters of PV and battery storage systems on the sub-synchronous oscillation of the systems are investigated. Analysis results show that the subsynchronous oscillation are closely related with PV's DC voltage control(DVC) and battery storage system's PLL. It is found that with increase of PV DVC bandwidth, the subsynchronous oscillation frequency of the systems will increase first and then almost unchanged, which improves the stability of system. However, with increase of battery storage PLL bandwidth, the subsynchronous oscillation frequency first decreases and then increases, decreasing the stability of system. Finally, the time-domain model of PV and battery energy storage systems connected to the weak grid is built to verify the correctness of the analysis.

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弱电网光伏与蓄电池系统的次同步振荡研究

本文研究了与弱电网并网的光伏系统和蓄电池系统的次同步振荡问题。为了分析系统的次同步振荡，建立了光伏与蓄电池储能系统的小信号模型。在此基础上，研究了光伏和蓄电池系统控制参数对系统次同步振荡的影响。分析结果表明，次同步振荡与光伏直流电压控制(DVC)和蓄电池系统锁相环密切相关。研究发现，随着PV - DVC带宽的增大，系统的次同步振荡频率先增大后基本不变，提高了系统的稳定性。然而，随着电池存储锁相环带宽的增加，次同步振荡频率先减小后增大，降低了系统的稳定性。最后，建立了接入弱电网的光伏和电池储能系统的时域模型，验证了分析的正确性。

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 4th International Conference on HVDC (HVDC)

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