基于虚拟同步发电机的多机逆变系统稳定性分析
Stability Analysis of Multi-machine Inverter System Based on Virtual Synchronous Generator
卢盛阳 1王同 2王会斌 3杜彦星 3孟令林 3王海鑫 3杨俊友 3隋玉秋4
作者信息
- 1. 沈阳工业大学电气工程学院,辽宁 沈阳 110870;国网辽宁省电力有限公司电力科学研究院,辽宁 沈阳 110006
- 2. 国网辽宁省电力有限公司电力科学研究院,辽宁 沈阳 110006
- 3. 沈阳工业大学电气工程学院,辽宁 沈阳 110870
- 4. 国网辽宁省电力有限公司,辽宁 沈阳 110004
- 折叠
摘要
为解决新能源并网逆变系统给电网惯量和阻尼特性带来的问题,虚拟同步发电机技术(VSG)得到广泛应用,但 VSG的引入也可能对系统的稳定性带来影响.对此,首先在单机逆变系统小信号模型的基础上建立多机逆变系统小信号模型;然后,分析系统关键参数特征根轨迹,从参数异步变化角度研究目标参数对多机系统整体和各 VSG之间高、中、低频稳定性的影响,揭示了多机系统参数的多频段稳定性影响规律,确定了多机系统部分结构和控制参数的稳定裕度.最后,通过仿真试验验证了理论分析的结论.
Abstract
In order to solve the problems caused by the new energy grid-connected inverter system to the inertia and damping characteristics of the power grid,the virtual synchronous generator(VSG)technology has been widely used,but the introduction of VSG may also affect the stability of the system.Firstly,the small signal model of multi-machine in-verter system is built on the basis of the small signal model of single-machine inverter system.Then,the characteristic root locus of the key parameters of the system is analyzed.The impact of the target parameters on the stability of high,medium and low frequencies between the whole multi-machine system and each VSG is studied respectively from the per-spective of parameter asynchronous change.In this way,the multi-band stability influence law of multi-machine system parameters is revealed,and the stability margin of part of the multi-machine system structure and control parameters is determined.Finally,the above theoretical analysis conclusions are verified by simulation experiments.
关键词
虚拟同步发电机/多机逆变系统/小信号模型/稳定性分析Key words
virtual synchronous generator/multi-machine inverter system/small signal model/stability analysis引用本文复制引用
基金项目
国网辽宁省电力有限公司"揭榜挂帅"科技攻关项目(2021YF-82)
出版年
2024
NETL
NSTL
万方数据