| 引用本文: | 罗 瑞,高厚磊,齐晓丽,等.基于VSG角频率误差负反馈的电压相位变化率孤岛检测方法[J].电力系统保护与控制,2024,52(23):45-53.[点击复制] |
| LUO Rui,GAO Houlei,QI Xiaoli,et al.An islanding detection method based on voltage phase rate of change with VSG angular frequency error negative feedback[J].Power System Protection and Control,2024,52(23):45-53[点击复制] |
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| 摘要: |
| 为了保障电网运行安全，分布式电源接入电网需要具备孤岛检测功能。传统过/欠频、过/欠压孤岛检测方法，应用于含虚拟同步发电控制逆变器和跟网逆变器的孤岛时，具有检测盲区较大的问题。为解决该问题，首先，推导了构网逆变器和跟网逆变器共同形成孤岛时电压幅值和频率的解析式，在此基础上验证了过/欠频、过/欠压方法无法准确检测出孤岛。然后，提出在dq坐标系中计算电压相位变化率的孤岛检测方法。并在VSG有功环加入角频率误差负反馈，以提高检测的准确性、灵敏性。最后，利用PSCAD搭建了构网逆变器和跟网逆变器构成孤岛的模型，仿真验证了所提方法的有效性。 |
| 关键词: 孤岛检测 VSG 角频率误差负反馈 并联逆变器 跟网逆变器 |
| DOI：10.19783/j.cnki.pspc.240337 |
| 投稿时间：2024-03-26修订日期：2024-08-20 |
| 基金项目:国家电网公司总部科技项目资助(5400- 202322206A-1-1-ZN) |
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| An islanding detection method based on voltage phase rate of change with VSG angular frequency error negative feedback |
| LUO Rui1,GAO Houlei1,QI Xiaoli1,CHEN Hechong2,YANG Fan2,YANG Zhichun2 |
| (1. School of Electrical Engineering, Shandong University, Jinan 250061, China; 2. Electric Power Research
Institute of State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China) |
| Abstract: |
| To ensure safe operation of the power grid, distributed power sources connected to the grid need to have islanding detection capabilities. Traditional over/under frequency (OUF) and over/under voltage (OUV) methods for islanding detection have a significant non-detection zone (NDZ) when applied to islands formed by virtual synchronous generator (VSG)-controlled inverters and grid-following inverters. To address this issue, the expressions for voltage amplitude and frequency are first derived for the scenario where grid-forming and grid-following inverters jointly form an island. Based on this, it is verified that the OUF and OUV methods cannot accurately detect the islanding condition. Then, a method for islanding detection is proposed by calculating the rate of change of voltage phase in the dq frame. Additionally, angular frequency error negative feedback is introduced into the active power loop of the VSG to improve detection accuracy and sensitivity. Finally, an islanding model of grid-forming and grid-following inverters using PSCAD is built, and the simulation validates the effectiveness of the proposed method. |
| Key words: islanding detection virtual synchronous generators (VSG) angular frequency error negative feedback parallel inverter grid-following inverter |
