A Low-Carbon Economic Dispatch Method for IES Considering the Safety Threshold of Echelon Utilization Energy Storage System

doi:10.12204/j.issn.1000-7229.2023.06.001

Abstract

Abstract:

To effectively reduce carbon emissions of the integrated energy system (IES) and solve safety problems in the echelon utilization of retired power batteries, this study proposes a low-carbon economic dispatch method for the application of retired power batteries in IES. First, a reliability evaluation method based on confidence interval estimation for retired power battery reconfiguration energy storage system (RESS) is proposed. A reasonable charge and discharge safety threshold improves the operation safety of retired power batteries. Second, the carbon consumption characteristics of retired power batteries are tracked. In addition, the carbon emission cost model for the retired power batteries in the whole process of echelon utilization to IES is established. Finally, the stepped carbon trading model is introduced, and the IES carbon emission cost and operating cost model is established. The battery safety threshold of the echelon utilization is periodically adjusted by considering the time-of-use electricity price, which realizes economical low-carbon dispatch of the IES. Through multi-scenario simulation analysis, the scheduling method for echelon utilization of retired power batteries in IES can effectively reduce the carbon emissions and costs of the verified system.

Key words: retired power battery, integrated energy system, confidence interval estimation, safety threshold, low-carbon economic dispatch

CLC Number:

TM734

NING Biwu, ZHANG Guanfeng, WANG Haixin, YAN Ning. A Low-Carbon Economic Dispatch Method for IES Considering the Safety Threshold of Echelon Utilization Energy Storage System[J]. ELECTRIC POWER CONSTRUCTION, 2023, 44(6): 1-11.

Figures/Tables 14

Fig.1 Schematic diagram of the IES added to RESS

Fig.2 Reliability assessment flow of RESS

Fig.3 Reward and punishment stepped carbon trading price curve

Fig.4 IES low carbon dispatch process considering RESS safety

Fig.5 Time-of-use price curve

Fig.6 New energy power output and electric / heat / gas load prediction curve

Table 1 IES parameter design

Fig.7 Probability distribution of battery module capacity deviation in different branches

Table 2 RESS SOC cycle interval setting %

Table 3 IES low-carbon scheduling scenario design

Table 4 IES optimization dispatch results in different scenarios

Fig.8 Curve of electricity-heat-gas load balance in scenario 4

Fig.9 IES operating cost under different carbon trading prices

Fig.10 IES carbon emissions under different carbon trading prices

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