Operation optimization of dual-source distributed energy supply systems based on two-level strategy

doi:10.3969/j.issn.2097-0706.2022.01.008

Abstract

Abstract:

The existing economic optimization strategy for distributed energy supply systems does not well balance the economic benefits and equipment operation stability.Accordingly,the operation optimization for dual-source distributed energy supply systems taking two-level strategy is proposed.Based on user-side operational data,average load of each period is predicted and the first level total load optimization is carried out.Then,to ensure the profitability of the optimization scheme,the second level incremental optimization is made by taking the average load as the benchmark of load variation,keeping the scheduling process of equipment adjusting with the load that varies between different periods relatively stable.During daily operation times,the system prefers the first level total load optimization scheme.And on this basis,the incremental optimization scheme will be carried out according to the difference between the reference value and hourly value of load.The total revenue of a typical day is obtained by revenue accumulation.The operation feasibility and system economy of the total load optimization,the incremental optimization and the two-level strategy are compared based on the simulation results carried out by Ebsilon engineering software.The results show that the two-level strategy is of reference value on optimizing system economy and operation stability.

Key words: distributed energy supply system, simulation, equipment scheduling, operation optimization, economy, coupling of multiple energy, CCHP

CLC Number:

TK01

YAO Zhehao, ZHENG Puyan, YUAN Yanzhou. Operation optimization of dual-source distributed energy supply systems based on two-level strategy[J]. Integrated Intelligent Energy, 2022, 44(1): 56-62.

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项目	联产设备		分产设备
项目	溴化锂机组	内燃机	电制冷机	燃气热水锅炉
台套数	5	5	6	2
额定发电功率/kW	—	4 401	—	—
额定制冷量/kW	3 490	—	6 330	—
额定制热量/kW	4 004	—	—	8 400
循环效率	1.00/0.98	0.46	5.35	0.95

种类	单位	价格
天然气价	元/m³	3.05
上网电价	元/(kW·h)	0.77
冷价	元/GJ	133.67
热价	元/GJ	157.93

时段	实际运行方案	总量优化方案	微增优化方案	两级优化方案
09:00—11:00	1A（1）+6B（33%）	4B（60%）	1A（1）+6B（33%）（起始点）	3B（73%）+B（42%）
11:00—13:00	1A（1）+6B（36%）	4B（65%）	1A（1）+1A（40%）+6B（33%）	3B（73%）+B（64%）
13:00—15:00	2A（1）+6B（37%）	5B（63%）	2A（1）+1A（40%）+6B（36%）	4B（73%）+B（47%）
15:00—17:00	2A（1）+6B（38%）	5B（66%）	2A（1）+1A（40%）+6B（37%）	4B（73%）+B（60%）
17:00—19:00	1A（1）+4B（42%）	3B（67%）	5B（38%）	3B（73%）
19:00—21:00	1A（1）+4B（37%）	3B（64%）	4B（32%）	2B（75%）+B（66%）
21:00—23:00	1A（1）+4B（38%）	3B（65%）	1A（1）+4B（37%）	2B（75%）+B（67.5%）
23:00—01:00	1A（1）+4B（42%）	3B（67%）	1A（1）+4B（37%）+B（15%）	3B（75%）+B（15%）
01:00—03:00	1A（1）+4B（42%）	3B（67%）	1A（1）+4B（42%）	3B（75%）+B（15%）
03:00—05:00	1A（1）+4B（41%）	3B（66%）	1A（1）+4B（42%）	2B（75%）+B（74%）
05:00—07:00	1A（1）+4B（41%）	3B（66%）	1A（1）+4B（42%）	2B（75%）+B（73%）
07:00—09:00	1A（1）+4B（43%）	3B（68%）	1A（1）+4B（41%）+B（20%）	3B（75%）+B（15%）