Optimization Scheduling of Cold-Heat-Electricity Integrated Energy System Under Pumped Storage Gray Start

doi:10.12096/j.2096-4528.pgt.24179

Abstract

Abstract:

Objectives Pumped storage units have gray start potential. Integrating this capability with the multi-energy complementary advantages of an integrated energy system (IES) makes it suitable for system recovery under extreme events. To investigate the post-disaster recovery mechanism of IES, this paper proposes an optimization scheduling model for a cold-heat-electricity integrated energy system (CHEIES) under pumped storage gray start. Methods First, stochastic scenario optimization is employed to address the uncertainties in wind, solar, cold, and thermal power. Latin hypercube sampling is used to generate a large number of random wind-solar-cold-heat scenarios, and a probability distance-based rapid reduction method is applied to reduce the number of scenarios. Then, for CHEIES under gray start, pumped storage serves as the gray start power source to provide startup power for the combined heat and power unit. A single-objective optimization scheduling model is established with gray start benefit as the core consideration, incorporating cold-heat-electricity power balance constraints to ensure the stable operation of IES under various load conditions. Finally, simulations are conducted to solve the model, and optimization scheduling strategies and economic benefits under different operation schemes are analyzed. Results CHEIES with pumped storage ash start-up shows high flexibility and operation efficiency in response to extreme natural disasters. Compared with the scheme without pumped storage ash start-up, the system operation cost is reduced by 12.14%. Conclusions The proposed method fully explores the reliability, economic efficiency, and flexibility of CHEIES under emergency conditions, providing strategic support for the rapid recovery of IES after extreme events.

Key words: integrated energy system (IES), pumped storage, gray start, black start, cold-heat-electricity integrated energy system (CHEIES), optimization scheduling, extreme events

CLC Number:

TK 01

Hui HOU, Yan WANG, Chao LIU, Wei ZHANG, Yangjun ZHOU, Zhengmao LI, Zhengtian LI, Xiangning LIN. Optimization Scheduling of Cold-Heat-Electricity Integrated Energy System Under Pumped Storage Gray Start[J]. Power Generation Technology, 2025, 46(2): 209-218.

Figures/Tables 9

Fig. 1 Research framework for optimization scheduling of CHEIES

Fig. 2 Structure of CHEIES energy supply system

Tab. 1 Comparison of 5 operation schemes

方案	负荷类型			抽水蓄能灰启动
方案	冷负荷	热负荷	电负荷	抽水蓄能灰启动
1	×	×	√	√
2	×	√	√	√
3	√	×	√	√
4	√	√	√	√
5	√	√	√	×

Tab. 2 Probability of occurrence for eachcurtailment scenario

场景	风光场景概率	冷热负荷场景概率
1	0.09	0.18
2	0.12	0.14
3	0.13	0.12
4	0.09	0.09
5	0.05	0.10
6	0.13	0.05
7	0.06	0.05
8	0.10	0.05
9	0.20	0.11
10	0.05	0.11

Fig. 3 Output of each device in scheme 1

Fig. 4 Output of each device in scheme 2

Fig. 5 Output of each device in scheme 3

Fig. 6 Output of each device in scheme 4

Fig. 7 Output of each device in scheme 5

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