压缩空气储能(Compressed air energy storage,CAES)因其寿命长、经济性好等优点在微电网中前景广泛.直驱型压缩空气储能(Direct-drive compressed air energy storage,DD-CAES)因其灵活性高、转速可变、效率较高等优势广泛应用于分布式压缩空气储能系统,但DD-CAES透平发电系统是具有非线性、强耦合的复杂系统,采用传统比例积分(Proportional-integral,PI)控制在功率跟踪和频率调节时易出现功率波动,进而导致频率扰动.因此,建立直驱型压缩空气储能透平发电系统的动态仿真模型,提出一种基于改进线性自抗扰控制(Linear active disturbance rejection control,LADRC)的DD-CAES调频控制策略,其控制系统主要包含用于预留容量的变工况功率跟踪模块和用于频率调节的变流器控制模块,对系统动态响应特性与调频特性分析可知,该控制系统可实现部分负载下的稳定频率支撑,且改进自抗扰控制可有效减小系统功率波动.最后通过仿真试验,验证不同工况场景下所提控制策略可在响应速度不变的前提下,同时减少系统最大频率偏差量(6.43%)和频率变化率最大值(11.65%),为建立电网友好型直驱型压缩空气储能电站提供了理论参考.
Frequency Regulation Control Strategy in Distributed Compressed Air Energy Storage Based on Improved Active Disturbance Rejection Control
Compressed air energy storage(CAES)has a wide prospect in microgrids due to its advantages of long life and good economy.Direct-drive compressed air energy storage(DD-CAES)is widely used in distributed CAES systems due to its high flexibility,variable speed,high efficiency,etc.However,DD-CAES turbine power generation system is a nonlinear,strongly coupled and complex system,which is prone to power fluctuation during power tracking and frequency regulation using traditional proportional-integral(PI)control,which leads to frequency perturbation.Therefore,a dynamic simulation model of DD-CAES turbine power generation system is established,and a frequency regulation control strategy in DD-CAES based on improved linear active disturbance rejection control(LADRC)is proposed.The control system mainly consists of a variable operating point tracking system for reserving capacity and a converter control system for frequency regulation,and the analysis of the system dynamic response characteristics and frequency regulation characteristics shows that the proposed strategy can reduce the maximum frequency deviation(6.43%)and maximum frequency rate of change(11.65%)of the system under different working condition scenarios,which provides a theoretical reference for the establishment of grid-friendly direct-driven compressed air energy storage power plants.
Direct-drive compressed air energy storage(DD-CAES)dynamic modelingfrequency regulationlinear active disturbance rejection controldisturbance compensation
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