超超临界二次再热机组耦合发电系统建模与性能分析

Modeling and Performance Analysis of Coupled Power Generation System of Ultra-supercritical Double Reheat Unit

针对当前超超临界二次再热技术瓶颈,区别于一般对热机层面的改进,从机电耦合的角度提出了一种新型耦合发电系统,以二次再热机组带小发电机运行,实现耦合发电,以提高发电效率。分析了该系统的结构配置,分别建立了各部分的数学模型并给出可行的控制方案。利用MATLAB/Simulink软件对该系统进行仿真,验证了各子系统的可靠性及整个系统的可行性,探讨了该系统在故障工况下的响应及其对原有厂用电系统稳定性的影响,对采用双机回热耦合发电系统的工程具有一定示范意义。

Aiming at the bottleneck of the current ultra-supercritical double reheat technology,which is different from the general improvement on the heat engine level,a novel type of coupled power generation system is proposed from the perspective of electromechanical coupling.The double reheat unit runs with a small generator,which can achieve coupling power generation and improve power generation efficiency.The structural configuration of the system is analyzed,the mathematical models are established and feasible control schemes are given.The MATLAB/Simulink software is used to simulate the proposed system,the reliability verification of each subsystem and the feasibility analysis of the operation of the entire system are carried out,and the response of the coupled power generation system under fault conditions and its impact on the original plant are analyzed.This article has a certain demonstration significance for engineering projects using dual-machine regenerative coupled power generation systems.