混合储能虚拟同步机频率优化调节研究  

Research on Frequency Optimal Regulation of Hybrid Energy Storage Virtual Synchronous Generator

作　　者：邓鹏[1] 杨沛豪 DENG Peng;YANG Peihao(College of New Energy,Jingchu University of Technology,Jingchu University of Technology,Jingmen 448000,China;Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China)

机构地区：[1]荆楚理工学院新能源学院,荆门448000 [2]西安热工研究院有限公司,西安710054

出　　处：《电源学报》2025年第2期142-151,共10页Journal of Power Supply

基　　金：国家自然科学基金资助项目(51671149);湖北省自然科学基金资助项目(2020CFB559)。

摘　　要：对蓄电池与超级电容组成的混合分布式储能虚拟同步机控制系统进行改进。提出混合储能功率分配原则,根据不同频率段设计分频滑动滤波方法,针对不同频率的功率波动,对虚拟转动惯量进行分段改进,实现蓄电池与超级电容协调配合。针对传统虚拟同步机无法抑制频率振荡的问题,对虚拟阻尼系数进行改进,采用自适应虚拟阻尼,提高控制系统在发生频率振荡时的调节能力。通过MATLAB对所提控制策略进行仿真验证,结果表明:对混合储能虚拟同步机进行分频控制,当负荷发生无规律波动时,超级电容及时响应高频功率波动,蓄电池平抑低频功率,可以实现蓄电池与超级电容协调配合。当面对突减、突增10 kW负荷时,采用自适应虚拟阻尼可以应对混合储能因为负载功率波动引起的有功出力频率振荡,频率超调量控制在0.06 Hz以内。所提控制策略面对功率突增、突减工况均可实现频率小偏差调节。The control system for hybrid distributed energy storage virtual synchronous generator(VSG)composed of a battery and a supercapacitor is improved.A principle for the power allocation of hybrid energy storage is proposed,and a frequency division sliding filter method is designed according to different frequency bands.In view of the power fluctuations of different frequencies,the virtual moment of inertia is piecewise improved to achieve the coordination between the battery and the supercapacitor.Aimed that the problem that the traditional VSG cannot suppress the frequency oscillations,the virtual damping coefficient is modified,and adaptive virtual damping is used to improve the regulation capability of the control system when the frequency oscillations occur.MATLAB is used to verify the proposed control strategy through simulations.Results show that the hybrid energy storage VSG can be controlled in terms of frequency,i.e.,when the load fluctuates irregularly,the supercapacitor responds to the high-frequency power fluctuation in time while the battery suppresses the low-frequency power,thus realizing the coordination between the battery and the supercapacitor.When faced with a sudden decrease or increase of 10 kW load,adaptive virtual damping can be used to deal with the frequency oscillations of active output caused by load power fluctuations of hybrid energy storage,and the frequency overshoot is controlled within 0.06 Hz.As a result,the proposed control strategy can adjust the small deviation of frequency regardless of the sudden increase or decrease of power.

关 键 词：混合分布式储能 虚拟同步机 分段虚拟惯量 自适应虚拟阻尼 

分 类 号：TM273[一般工业技术—材料科学与工程]