作者：周里涛1, 吴岩1, 徐昌前1, 张弓帅2, 杨朝翔3
作者单位：1. 国网四川省电力公司信息通信公司，四川 成都 610041;
2. 云南电网有限责任公司玉溪供电局，云南 玉溪 653100;
3. 华北电力大学 高压与电磁兼容北京重点实验室，北京 102206
关键词：电力电子;配电网;储能;故障穿越;飞轮;频率电压支持
摘要：
随着可再生能源渗透率的不断攀升，其固有的强波动性使配电网频率电压的控制极为复杂。基于此，该文提出一种计及配电网阻抗比的分布式储能系统电压频率协调支撑控制方法。该方法采用基于下垂特性的频率支撑模块和虚拟惯量控制模块，利用根短路故障特征在线计算自适应增益，以保证配电网电压和频率支撑之间的均衡补偿。与传统输电网支撑方案中电压和频率解耦不同，该方法考虑低压配电网中电网阻抗特性引起的电压和频率的耦合问题。最后，通过仿真和半实物实验验证所提方法的有效性和优越性。仿真结果表明：所提方法可将频率最低点限制在48.84~48.97 Hz，正序电压幅值由0.431 p.u.提高到0.451 p.u.。
Voltage and frequency coordinated support control for energy storage system in distribution network
ZHOU Litao1, WU Yan1, XU Changqian1, ZHANG Gongshuai2, YANG Chaoxiang3
1. Information and Communication Company, State Grid Sichuan Electric Power Company, Chengdu 610041, China;
2. Yuxi Power Supply Bureau, Yunnan Power Grid Co., Ltd., Yuxi 653100, China;
3. Beijing Key Laboratory of High Voltage & Electromagnetic, North China Electric Power University, Beijing 102206, China
Abstract: With the increasing permeability of renewable energy, its inherent strong fluctuation makes the control of frequency voltage of distribution network extremely complicated. Based on this, this paper proposes a voltage frequency coordinated support control method for distributed energy storage system which takes into account the impedance ratio of distribution network. In this method, the frequency support module and the virtual inertia control module based on droop characteristics are used to calculate the adaptive gain online by using the root short-circuit fault characteristics to ensure the balanced compensation between the voltage and frequency support of the distribution network. Different from the voltage and frequency decoupling in the traditional transmission network support scheme, this method takes into account the coupling problem of voltage and frequency caused by the network impedance characteristics in the low-voltage distribution network. Finally, the effectiveness and superiority of the proposed method are verified by simulation and HWIL experiments. The simulation results show that the proposed method can limit the minimum frequency from 48.84 Hz to 48.97 Hz, and the amplitude of positive sequence voltage is 0.431 p.u., improved to 0.451 p.u.
Keywords: power electronics;distribution grids;energy storage;fault-ride-through;flywheel;frequency-voltage support
2023, 49(2):50-57 收稿日期: 2021-04-12;收到修改稿日期: 2021-06-07
基金项目: 国家自然科学基金资助项目（51877084）
作者简介: 周里涛(1971-),男,四川成都市人,高级工程师,硕士,研究方向为高渗透率可再生能源配电网频率电压控制技术
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