Refined collaborative optimized operation of integrated energy systems considering nonlinear energy efficiency of equipment under variable operating conditions

doi:10.3969/j.issn.2097-0706.2023.10.001

Abstract

Abstract:

Multiple energies including electricity， heat， cold and gas are coupled in the integrated energy system（IES）. Energy conversion equipment and energy transportation equipment installed in the system feature nonlinear operation under variable conditions， leading to the magnificent gap between supply and demand. And the output allocation among multiple units of the same type is uneven under variable operating conditions. Therefore， a refined collaborative optimization method for the IES considering the non-linearity of equipment under variable operating conditions is proposed. Firstly， the cooperative optimized operation architectures for different types of units under nonlinear operation and variable working conditions are constructed. Then， nonlinear operation curves of the units under variable conditions are segmented and linearized. Taking the energy consumption of pumps and pipeline flow balance constraint into consideration can improve the supply-demand balance and the reliability of the IES. The optimization scheduling model takes the minimum daily operating cost as the optimization goal. The model is simulated on a IES under multiple scenarios. The simulation results show that considering the non-linear operation characteristic of different units of the same type under variable working conditions can effectively reduce the operating cost and supply-demand gap of power systems.

Key words: IES, muti-energy coupling, non-line variable working condition, supply-demand balance, optimized scheduling, output allocation

CLC Number:

TK019：TM721

ZHAO Huirong, LI Tianchen, ZHOU Quan, PENG Daogang. Refined collaborative optimized operation of integrated energy systems considering nonlinear energy efficiency of equipment under variable operating conditions[J]. Integrated Intelligent Energy, 2023, 45(10): 1-9.

Figures/Tables 10

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设备	参数	数值
电锅炉	最大制热量/kW 数量/台效率/%	2 200.0 2 93
燃气锅炉	最大制热量/kW 数量/台	3 200.0 2
燃气内燃机	最大发电量/kW 数量/台	1 000.0 2
溴化锂机组	最大制热量/kW 最大制冷量/kW 数量/台	1 200.0 1 250.0 2
双工况冷水机组	最大制冷量/kW 最大制冰量/kW 数量/台	4 220.0 2 778.0 2
电制冷机	最大制冷量/kW 台数	7 500.0 2
蓄冰盘管	最大蓄冰量/kW 充、放效率/% 最大充放量/(kW·h)	43 929.6 97 5 600
蓄热罐	最大蓄热量/kW 充、放效率/% 最大充放量/(kW·h)	25 000.0 97 3 200

场景	日运行成本/元			供需匹配偏差/(kW·h^-1)				泵耗电量/（kW·h）
场景	购气成本	购电成本	总成本	电能	热能	冷能	冰能	泵耗电量/（kW·h）
1	75 891.13	82 396.04	158 287.17	7.37	54.54	4.55	0	1 196.5
2	77 456.17	83 425.32	160 878.49	0	514.68	4 632.51	0	1 314.6
3	77 057.46	80 576.41	157 633.87	0.20	28.63	0	0	1 206.4
4	76 998.42	80 887.48	157 885.90	3.51	28.64	0	0	1 250.6