提高构网型储能系统功角稳定性的附加阻尼方法
CSTR:
作者:
作者单位:

(1.国家电网有限公司西北分部,陕西 西安 710048;2.浙江大学电气工程学院,浙江 杭州 310027)

通讯作者:

年 珩(1978—),男,博士,教授,主要从事新能源并网运行与控制技术研究;E?mail:nianheng@zju.edu.cn

中图分类号:

TM46

基金项目:

国家电网有限公司西北分部科技项目(SGNW0000DKJS2200112)


Additional damping method for improving the power angle stability of grid‑forming energy storage system
Author:
Affiliation:

(1.Northwest Branch of State Grid Corporation of China, Xi'an 710048, China; 2.College of Electrical Engineering,Zhejiang University, Hangzhou 310027, China)

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    摘要:

    虚拟同步发电机(VSG)技术是一种被广泛应用的构网型储能控制策略。然而,由于模拟同步发电机外特性导致的非线性功角关系,VSG与同步发电机类似,在严重扰动下容易与电网失去同步。为此,分析并网VSG的大信号功角稳定性,提出一种提高功角稳定性的附加阻尼方法,该方法是一种将线性化模型与非线性化模型相结合的理论分析方法。采用线性化模型对阻尼比和频率变化率(RoCoF)进行定性分析,说明附加阻尼方法可以在不降低频率稳定性的前提下提高功角稳定性;在此基础上,采用非线性化模型进行定量分析以准确评估电网故障后VSG的功角稳定性。理论分析和仿真验证表明,在有功功率控制回路中,引入附加阻尼可以提高VSG的功角稳定性。

    Abstract:

    Virtual synchronous generator (VSG) is a widely used grid?forming control strategy. However, due to the nonlinear power angle relationship caused by the analog of external characteristics of synchronous generators, VSG is similar to synchronous generators and is prone to lose synchronization with the power grid under severe disturbances. This paper analyzes the large signal power angle stability of grid?connected VSG, and an additional damping method to improve the power angle stability is proposed, the method is a theoretical analysis method combining the linearized model with the nonlinearized model. Firstly, the linearized model is used to qualitatively analyze the damping ratio and the rate of change of frequency (RoCoF), which shows that the additional damping method can improve the power angle stability without reducing the frequency stability. On this basis, the nonlinear model is used for quantitative analysis to accurately evaluate the power angle stability of VSG after a power grid fault. Theoretical analysis and simulation show that adding additional damping into the active power control loop can improve the power angle stability of VSG.

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王吉利,占 领,张 钢,等.提高构网型储能系统功角稳定性的附加阻尼方法[J].电力科学与技术学报,2023,38(4):75-81,103.
WANG Jili, ZHAN Ling, ZHANG Gang, et al. Additional damping method for improving the power angle stability of grid‑forming energy storage system[J]. Journal of Electric Power Science and Technology,2023,38(4):75-81,103.

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  • 在线发布日期: 2023-11-06
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