| 引用本文: | 杨 效,曾成碧,赖 辉,等.弱电网下基于谐波状态空间模型的光储-虚拟同步发电机稳定性分析与优化控制研究[J].电力系统保护与控制,2023,51(16):34-47.[点击复制] |
| YANG Xiao,ZENG Chengbi,LAI Hui,et al.A stability analysis method and optimal control of a photovoltaic energy storage-virtual synchronous generator based on a harmonic state space model in a weak grid[J].Power System Protection and Control,2023,51(16):34-47[点击复制] |
|
| 摘要: |
| 虚拟同步发电机(virtual synchronous generator, VSG)技术因提供阻尼和惯量而被广泛用于新能源并网逆变器。光储并入弱电网易发生频率耦合等问题，因而VSG并网稳定性分析变得更加复杂。针对光储并入弱电网系统，考虑频率耦合，在dq域中建立基于谐波状态空间(harmonic state space, HSS)理论的多时间尺度虚拟同步发电机模型。采用归一化参数灵敏度分析法，揭示功率环、电压环和低通滤波中虚拟惯量J、虚拟阻尼Dp、下垂系数Ku、比例系数kpu和截止频率ωc等关键控制参数根轨迹的特性和电网强度对系统稳定性的影响。并通过调整优化控制参数，提高系统稳定性。最后在Matlab/Simulink仿真平台验证谐波状态空间模型精确度和关键参数根轨迹特性。 |
| 关键词: 虚拟同步发电机 弱电网 谐波状态空间 稳定性分析 |
| DOI：10.19783/j.cnki.pspc.230103 |
| 投稿时间：2023-02-02修订日期：2023-06-08 |
| 基金项目:四川省重点研发项目资助(2023YFG0198)；国家电网有限公司科技项目资助(52272222001J) |
|
| A stability analysis method and optimal control of a photovoltaic energy storage-virtual synchronous generator based on a harmonic state space model in a weak grid |
| YANG Xiao1,ZENG Chengbi1,LAI Hui1,WU Xuefeng1,MIAO Hong1,LIU Wenfei2,YANG Yong2 |
| (1. College of Electrical Engineering, Sichuan University, Chengdu 610065, China; 2. Electric Power Research
Institute of State Grid Gansu Electric Power Company, Lanzhou 730050, China) |
| Abstract: |
| Virtual synchronous generator (VSG) technology is widely used in the control of new energy grid-connected inverters because it provides damping and inertia. It is easy to cause frequency coupling when photovoltaic energy storage systems are connected to a weak grid, so analyzing the grid-connected stability of a VSG becomes more complicated. For photovoltaic energy storage systems connected to a weak grid, a multi-time scale VSG model based on harmonic state space (HSS) theory is established in the dq domain considering frequency coupling. The normalized parameter sensitivity analysis method is used to reveal the characteristics of root locus of key control parameters such as virtual inertia J, virtual damping Dp, droop coefficient Ku, proportional coefficient kpu and cut-off frequency c in power loop, voltage loop and low-pass filter, and the influence of power grid strength on system stability. The control parameters are adjusted and optimized to enhance system stability. Finally, the accuracy of the harmonic state space model and the root trajectory characteristics of the key parameters are verified on the Matlab/Simulink simulation platform. |
| Key words: virtual synchronous generator weak power grid harmonic state space stability analysis |
