含储热光热电站的电网调度模型与并网效益分析

Grid Dispatch Model and Interconnection Benefit Analysis of Concentrating Solar Power Plants with Thermal Storage

含储热的光热发电系统是近年来太阳能利用的一种新的发展方向。其优势体现在:借助大容量的储热装置,该系统能够平移所吸收的光热能,具有良好的可调度性;同时其中的汽轮机组具有良好的可控性。从含储热的光热电站的运行机理入手,经过抽象和简化,得到了面向电网调度的光热电站模型。该模型刻画了光热电站中的能量流及其主要运行约束,适用于电网调度。在传统安全约束机组组合模型基础上,提出了含光热电站的电网调度模型。对算例系统进行了电网调度仿真,分析了在完全接纳光热发电的前提下,光热电站并网在发电成本、可再生能源接纳和提高汇集输电线路利用率等方面的可观效益。

Nowadays,the concentrating solar power （CSP） plant with thermal storage is a new way to utilize solar power.By making full use of large-capacity CSP devices,the CSP system is able to translate the solar power absorbed.Additionally,the CSP generates power via a steam turbo-generator and has fast regulating performance.The operation behavior of CSP is studied from the viewpoint of power grid,based on which its mathematical model for dispatch is developed.The model describes the power flow inside the CSP with its major operation constraints.Furthermore,the model for power system dispatch considering CSP plants is built based on the security-constrained unit commitment problem.It is shown by simulation that CSP,on the premise of its energy being fully accommodated,may bring about considerable benefits to the power system by reducing the generation cost,increasing renewable energy accommodation and enhancing utilization of transmission lines.