压缩空气储能发电频率特性分析

Frequency Characteristic Analysis of Compressed Air Energy Storage Power Generation

当前阶段,我国主要的电力来源是煤、石油和天然气这三种广泛使用的传统能源。未来,我国火电发电的量将在很长一段时间内保持下降的趋势,将会难以满足调峰以及调频的需求,因此,储能是解决电力供需平衡的有效手段。压缩空气储能是一种容量较大的储能技术,在压缩空气储能技术的背景下,研究了一种将液体作为驱动介质,利用高压压缩空气进行发电的方法。在系统中建立了压缩空气的热力学模型、液压马达的数学模型以及同步发电机的数学模型,并将这些模型在Simulink中进行仿真搭建,分析了储气罐压力和马达排量对于系统中马达转速的影响,并对这些参数进行设计选取,针对马达转速波动过大无法并网发电的问题,采取传统PID的方法来减小马达的转速波动,稳定系统的输出,保证发电机的平稳运行。

At present,China's main power sources are coal,oil and natural gas,three widely used traditional energy sources.In the future,the amount of thermal power generation in China will keep declining for a long time,and it will be difficult to meet the demand of peak and frequency modulation.Therefore,energy storage is an effective means to solve the balance between power supply and demand.Compressed air energy storage is a kind of energy storage technology with large capacity.Under the background of compressed air energy storage technology,this paper studies a method of using liquid as driving medium and high pressure compressed air to generate electricity.The thermodynamic model of compressed air,the mathematical model of hydraulic motor and the mathematical model of synchronous generator are established in the system,and these models are simulated in Simulink.The influence of gas storage tank pressure and motor displacement on the motor speed in the system is analyzed,and the design of these parameters is selected.Aiming at the problem that the motor speed fluctuation is too large to be connected to the grid,the traditional PID method is adopted to reduce the motor speed fluctuation,stabilize the output of the system,and ensure the stable operation of the generator.