Interval analysis of the small-signal stability of grid-connected voltage-source converter system considering multiparameter uncertainty

IF 1.6 Q4 ENERGY & FUELS IET Energy Systems Integration Pub Date : 2024-03-08 DOI:10.1049/esi2.12141
Fuxin Ouyang, Zhenguo Shao, Changxu Jiang, Yan Zhang, Feixiong Chen
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Abstract

Grid-connected voltage source converters (VSCs) have been broadly applied in modern power system. However, instability issues may be triggered by the integration of grid-connected VSCs, jeopardising the operation of the power grid. Conventional stability analysis methods can be utilised to derive system stability margins under nominal conditions. Whereas grid-connected VSCs inevitably operate under multiparameter uncertainty, which may result in overly optimistic or even incorrect estimations of stability margins, thereby posing potential risks to system operation. To address this issue, an interval small-signal stability analysis approach is proposed to investigate the system stability under multiparameter uncertainty. First, the interval state-space model of the grid-connected VSC system is constructed based on interval symbolic linearisation. Furthermore, the interval eigenvalue decomposition is introduced to calculate the interval eigenvalue distribution of the interval state-space model. Eventually, the upper bounds of the real part of the dominant interval eigenvalues are utilised for deriving interval stable parameter regions. Results of Monte Carlo analysis and time-domain simulations of the grid-connected VSC system are utilised to verify the effectiveness of the proposed interval stability analysis method.

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考虑多参数不确定性的并网电压源变流器系统小信号稳定性区间分析
并网电压源转换器(VSC)已广泛应用于现代电力系统。然而,并网电压源转换器可能会引发不稳定问题,从而危及电网的运行。传统的稳定性分析方法可用于推导额定条件下的系统稳定裕度。而并网可变电压调节器不可避免地会在多参数不确定的情况下运行,这可能会导致对稳定裕度的估计过于乐观甚至错误,从而给系统运行带来潜在风险。针对这一问题,本文提出了一种区间小信号稳定性分析方法来研究多参数不确定性下的系统稳定性。首先,基于区间符号线性化构建了并网 VSC 系统的区间状态空间模型。此外,引入区间特征值分解来计算区间状态空间模型的区间特征值分布。最后,利用主要区间特征值实部的上界推导出区间稳定参数区域。利用蒙特卡罗分析和并网 VSC 系统的时域仿真结果,验证了所提出的区间稳定性分析方法的有效性。
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来源期刊
IET Energy Systems Integration
IET Energy Systems Integration Engineering-Engineering (miscellaneous)
CiteScore
5.90
自引率
8.30%
发文量
29
审稿时长
11 weeks
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