| 引用本文: | 姜惠兰,蔡继朝,肖瑞,王绍辉,谢岩,唐晓骏.一种提高系统频率响应特性的风储协调控制策略[J].电力自动化设备,2021,41(7): |
| JIANG Huilan,CAI Jizhao,XIAO Rui,WANG Shaohui,XIE Yan,TANG Xiaojun.A wind-storage coordinated control strategy for improving system frequency response characteristics[J].Electric Power Automation Equipment,2021,41(7): |
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| 摘要: |
| 风电并网规模的不断扩大削弱了电力系统的惯量水平，给频率稳定带来巨大挑战。通过分析不同风速下双馈风机(DFIG)参与惯性响应的能力，给出了一种风速分段方法，从而确定DFIG参与调频的风速范围。在此基础上，提出了一种DFIG与储能技术联合的调频控制策略，根据系统惯性响应和频率恢复2个阶段的频率变化特点，制定风储协调出力模式：在惯性响应阶段，通过虚拟惯性控制使DFIG释放转子动能以阻止频率跌落，并采用超速控制将DFIG转速变化分配至最大功率点跟踪控制运行点两侧以改善调频效果，同时逐渐增加储能系统的输出功率对DFIG后期的调频功率下降进行补充；在频率恢复阶段，将DFIG退出调频模式以避免虚拟惯性控制从系统索取能量，主要依靠储能系统出力辅助同步发电机加快完成一次调频。算例仿真结果表明所提方法能够有效改善系统的频率响应特性，避免二次频率事故的发生，提高了系统的频率稳定性。 |
| 关键词: 双馈风机 频率稳定 风速分段 储能系统 协调控制策略 |
| DOI：10.16081/j.epae.202105019 |
| 分类号:TM614;TM712 |
| 基金项目:国家自然科学基金资助项目(51477115) |
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| A wind-storage coordinated control strategy for improving system frequency response characteristics |
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JIANG Huilan1, CAI Jizhao1, XIAO Rui1, WANG Shaohui1, XIE Yan2, TANG Xiaojun2
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1.Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China;2.State Key Laboratory of Grid Security and Energy Conservation, China Electric Power Research Institute, Beijing 100192, China
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| Abstract: |
| The continuous expansion of wind power integration scale weakens the inertia level of power system and brings great challenges to frequency stability. By analyzing the ability of DFIG(Doubly-Fed Induction Generator) to participate in the inertial response at different wind speeds, a wind speed segmentation method is presented to determine the wind speed range for DFIG participating in frequency modulation. On this basis, a frequency modulation control strategy combined with DFIG and energy storage technology is proposed. According to the frequency change characteristics in the two stages of system inertia response and frequency recovery, the wind-storage joint output mode is formulated. In the inertia response stage, virtual inertia control is used to release the rotor kinetic energy of DFIG to prevent frequency drop, and overspeed control is used to distribute the change of DFIG speed to both sides of the maximum power point tracking control operation point to improve the frequency modulation effect. At the same time, the output power of energy storage system is gradually increased to make up for the decrease of frequency modulation power in the later period of DFIG. In the frequency recovery stage, DFIG is exited from the frequency modulation mode to avoid the virtual inertia control requesting energy from the system, and mainly relying on the output of energy storage system to assist the synchronous generator to speed up the primary frequency modulation. Simulative results show that the proposed method can effectively improve the frequency response characteristics of the system, avoid the occurrence of secondary frequency accidents, and improve the frequency stability of the system. |
| Key words: doubly-fed induction generator frequency stability wind speed segmentation energy storage system coordinated control strategy |
