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| Multi-stage dynamic frequency regulation strategy for wind-storage integrated systems considering adaptive SOC modulation |
| DOI：10.19783/j.cnki.pspc.260291 |
| Key Words:wind-storage integrated system state of charge (SOC) multi-stage dynamic frequency regulation Sigmoid modulation function |
| Author Name | Affiliation | | DONG Hong | 1. Guangzhou Power Supply Bureau, Guangdong Power Grid Co., Ltd., Guangzhou 510620, China
2. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China | | CHENG Peijun | 1. Guangzhou Power Supply Bureau, Guangdong Power Grid Co., Ltd., Guangzhou 510620, China
2. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China | | HU Liujun | 1. Guangzhou Power Supply Bureau, Guangdong Power Grid Co., Ltd., Guangzhou 510620, China
2. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China | | ZENG Fanhong | 1. Guangzhou Power Supply Bureau, Guangdong Power Grid Co., Ltd., Guangzhou 510620, China
2. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China | | GAO Yuqun | 1. Guangzhou Power Supply Bureau, Guangdong Power Grid Co., Ltd., Guangzhou 510620, China
2. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China | | MA Weidong | 1. Guangzhou Power Supply Bureau, Guangdong Power Grid Co., Ltd., Guangzhou 510620, China
2. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China | | YAN Jingqiu | 1. Guangzhou Power Supply Bureau, Guangdong Power Grid Co., Ltd., Guangzhou 510620, China
2. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China | | ZHENG Yi | 1. Guangzhou Power Supply Bureau, Guangdong Power Grid Co., Ltd., Guangzhou 510620, China
2. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China | | CHEN Lei | 1. Guangzhou Power Supply Bureau, Guangdong Power Grid Co., Ltd., Guangzhou 510620, China
2. School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China |
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| Abstract:To address the problem that traditional energy storage frequency regulation strategies struggle to adapt to the differentiated requirements across multiple frequency regulation stages in high-penetration wind power systems, as well as the risk of secondary frequency drops due to state-of-charge (SOC) violations, a multi-stage dynamic frequency regulation strategy for wind-storage integrated systems considering SOC-adaptive modulation is proposed. First, the equivalent frequency response characteristics of the system are analyzed, and the differences in control requirements among different frequency regulation stages are clarified. Second, a bidirectional asymmetric Sigmoid-type adaptive modulation function is constructed to achieve smooth switching and adaptive matching of control parameters for the wind-storage coordinated frequency regulation across different stages. Finally, a time-domain simulation model is built for multi-condition comparative verification. The results show that, compared with conventional frequency regulation schemes, the proposed strategy reduces the maximum rate of change of frequency from 0.58 Hz/s to 0.51 Hz/s. Under a low-SOC condition with an initial SOC of 0.3, it improves the frequency nadir by 0.03 Hz while maintaining the SOC above the 15% safety threshold throughout the process. This effectively reduces the risk of secondary frequency drop and improves both the system frequency security margin and the long-term frequency regulation capability of the energy storage system. |
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