An integrated planning framework for optimal power generation portfolio including frequency and reserve requirements

IF 1.6 Q4 ENERGY & FUELS
Olayinka Ayo, Paola Falugi, Goran Strbac
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Abstract

Electricity system decarbonisation poses several challenges to network stability and supply security, given renewables' intermittency and possible reduction of system inertia. This manuscript presents a novel integrated system framework to determine optimal generation investments for addressing decarbonisation challenges and achieving cost-effective electricity systems while ensuring frequency stability and reserve requirements are met at the operational level in a net-zero system. The novel planning framework is a mixed-integer bilinear programming problem accurately modelling clustered variables for the on/off status of generation units and seconds-timescale frequency requirements at an operational and planning level. The benefits of the decision framework and effects of dispatch decisions in a year are illustrated using the Great Britain case study. The results provide optimal trade-offs and cost-effective investment portfolios for including detailed modelling of unit-commitment and frequency stability constraints versus not including them in the planning model. Making investment decisions for a net-zero electricity system without these constraints can lead to very high system costs due to significant demand curtailment. Although the model's computation burden was increased by these constraints, complexity was managed by formulating them tightly and compactly. Non-convex quadratic nadir constraints were efficiently solvable to global optimality by applying McCormick relaxations and branching techniques in an advanced solver.

Abstract Image

包括频率和储备需求的最优发电组合的综合规划框架
考虑到可再生能源的间歇性和可能减少的系统惯性,电力系统脱碳对网络稳定性和供应安全构成了若干挑战。本文提出了一个新的集成系统框架,以确定解决脱碳挑战和实现具有成本效益的电力系统的最佳发电投资,同时确保在净零系统的运行层面满足频率稳定性和储备要求。新的规划框架是一个混合整数双线性规划问题,该问题精确地模拟了发电机组的开/关状态和秒时间尺度频率要求在操作和规划层面上的聚类变量。决策框架的好处和一年内派遣决策的影响是用英国的案例研究来说明的。结果提供了最佳的权衡和具有成本效益的投资组合,包括详细的机组承诺和频率稳定性约束建模,而不是将它们包括在规划模型中。在没有这些限制的情况下,为净零电力系统做出投资决策,可能会因需求大幅减少而导致系统成本非常高。尽管这些约束增加了模型的计算负担,但通过严密紧凑地表述这些约束来控制复杂性。利用McCormick松弛和分支技术,在一种先进的求解器中求解非凸二次最低点约束的全局最优性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
IET Energy Systems Integration
IET Energy Systems Integration Engineering-Engineering (miscellaneous)
CiteScore
5.90
自引率
8.30%
发文量
29
审稿时长
11 weeks
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