引用本文: | 刘英培,田仕杰,梁海平,等.考虑SOC的电池储能系统一次调频策略研究[J].电力系统保护与控制,2022,50(13):107-118.[点击复制] |
LIU Yingpei,TIAN Shijie,LIANG Haiping,et al.Control strategy of a battery energy storage system considering SOC in primaryfrequency regulation of power grid[J].Power System Protection and Control,2022,50(13):107-118[点击复制] |
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摘要: |
电池储能系统(Battery Energy Storage System, BESS)以其控制精度高、响应速度快等优势被广泛应用于电网中。为充分发挥BESS参与电网一次调频的优势,提出一种基于荷电状态(State Of Charge, SOC)与频率偏差的综合控制方法。首先,为了改善电池循环寿命,设计基于荷电状态SOC的下垂系数与虚拟惯性系数。引入基于频率偏差的加权系数将下垂出力与虚拟惯性出力相结合,在频率偏差较小时增加虚拟惯性出力权重以稳定频率,在频率偏差较大时增加下垂出力权重以快速调节频率偏差,并在频率偏差超过一定限度后进行故障穿越时的频率支撑,而当电网状态变好且SOC较低或较高时进行SOC恢复。其次,提出BESS参与电网一次调频的评价指标以定量评估所提策略的调频效果及SOC维持效果。最后,基于PSCAD/EMTDC搭建BESS仿真模型,并在阶跃负荷扰动、随机负荷扰动、瞬时性短路故障及光伏间歇性出力扰动工况下仿真验证所提策略的调频效果及SOC维持效果。仿真结果表明,所提策略能实现较好的调频效果并将SOC维持在合理区间内。研究成果为BESS成套设备生产厂家合理设计控制保护参数提供参考,对提升BESS涉网性能具有实际意义。 |
关键词: 电池储能系统 一次调频 荷电状态 频率偏差 控制策略 |
DOI:DOI: 10.19783/j.cnki.pspc.211530 |
投稿时间:2021-11-15修订日期:2022-01-06 |
基金项目:国家自然科学基金项目资助(51607069);中国电力科学研究院有限公司科技项目资助(XT83-20-005) |
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Control strategy of a battery energy storage system considering SOC in primaryfrequency regulation of power grid |
LIU Yingpei,TIAN Shijie,LIANG Haiping,XIE Yan,HUO Qidi,TANG Xiaojun |
(1. School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, China;
2. State Key Laboratory of Grid Security and Energy Conservation, China Electric Power Research Institute, Beijing 100192, China) |
Abstract: |
The battery energy storage system (BESS) has been widely used in power grids with the advantages of high control accuracy and fast response speed. In order to use the advantages of BESS in primary frequency regulation (PFR) of a power grid, this paper proposes an integrated control strategy based on state of charge (SOC) and frequency deviation. First, the droop coefficient and the virtual inertia coefficient based on SOC are designed to improve battery cycle life. Then the weighting coefficients based on frequency deviation are introduced to combine the droop output with the virtual inertial output. When the frequency deviation is small, the weighting coefficient of the virtual inertia output is increased to stabilize the frequency. When the frequency deviation is large, the weighting coefficient of the droop control is increased to quickly adjust the frequency deviation. When the frequency deviation exceeds a certain limit, BESS performs frequency support during fault ride-through. In addition, when the system is in good condition and the SOC is low or high, the SOC recovery is performed. Secondly, an evaluation index of BESS participating in the PFR of the power grid is proposed to quantitatively evaluate the frequency regulation performance and the SOC maintenance performance of this strategy. Finally, a simulation model of BESS is built in PSCAD/EMTDC, and the frequency regulation and the SOC maintenance performance of this strategy are verified by simulation under step load and random load disturbance, transient short-circuit fault and intermittent output of PV conditions. The simulation results indicate that this strategy can improve the frequency regulation performance and maintain the SOC within a reasonable range. The results can provide a reference for equipment manufacturers of BESS to design control and protection parameters reasonably, and have practical significance for improving BESS's grid-connected performance.
This work is supported by the National Natural Science Foundation of China (No. 51607069). |
Key words: battery energy storage system primary frequency regulation state of charge frequency deviation control strategy |