压缩空气储能膨胀发电系统最高效率跟踪控制

Maximum efficiency tracking control of compressed air energy storage expansion power generation system

由于传统的压缩空气储能膨胀发电系统会出现膨胀机无法在变工况下始终工作在相应最大效率点的情况,设计了一种膨胀发电系统最高效率跟踪控制策略。该策略主要以相似理论为依据,使膨胀机在任何时刻都能以最优状态运行,达到节约能源的目的。当网侧需求功率变化时,根据相似理论可计算出膨胀机进口流量及膨胀比的值,进而得到最佳参考转速值,同时发电机在机侧变流器的控制下跟踪该转速,实现系统的高效运行。对系统搭建仿真模型,结果表明,采用本文的控制策略能够使膨胀机在不同功率需求下均可工作在效率最高点。

Since the expander is unable to always work at the corresponding maximum efficiency point under varying working conditions in the traditional compressed air energy storage expansion power generation system,a maximum efficiency tracking control strategy for the expansion power generation system is designed.The strategy is mainly based on similarity theory so that the expander can operate in the optimal performance at any time to achieve the purpose of saving energy.When the demand power on the grid sides changes,the expansion machine inlet flow and expansion ratio can be calculated based on the similarity theory,and then the optimal reference speed can be obtained.Meanwhile,the generator tracks the speed under the control of the machineside converter to realize the efficient operation of the system.A simulation model is built for the system,and the results show that the expander can work at the highest efficiency point under different power requirements by using the proposed control strategy.