Distributed Dispatch Method for Multi-region Electricity-Gas Integrated Energy Systems Considering Cross-region Energy Flow Interaction Plan

doi:10.12204/j.issn.1000-7229.2020.12.007

Abstract

Abstract:

According to the problem of collaborative optimization with multi-region electricity-gas interconnection system, a distributed optimization method considering interaction plan of energy flow with tie lines and tie pipes is proposed in this paper. Firstly, the second-order cone relaxation is adopted to linearize the gas flow equation of the gas network; between regions, by optimizing the energy flow interaction plan of the connection line and pipeline, the output of the generation unit is optimized to promote the wind power consumption in the interconnected region, a centralized optimization model that satisfies the constraints of the tie line and the tie pipe is established with a single region as the decision-making subject. Then, the paper analyzes the energy flow decoupling mechanism of multi-region electricity-gas interconnection system, and on the basis of a standard alternating direction multiplier method, a decentralized optimization algorithm, synchronous-ADMM method (S-ADMM), is obtained, in which the authors performs a reconstruction solution and establishes a completely decentralized scheduling model. Finally,the analysis of calculation examples is carried out in multi-regional electrical interconnection systems of different scales, and it is obtained that the proposed algorithm has better convergence; the system operation is optimized by the interconnected way of tie lines and pipes; the multi-region interconnection system can be changed by the peak-to-valley ratio of tie line optimizes the allocation of power generation resources in each region, reduces the amount of regional wind abandonment, and reduces operating costs, which can provide a reference for optimization of multi-regional energy systems.

Key words: multi-region electricity-gas interconnection system, distributed collaborative optimization, second-order cone relaxation, energy flow interaction

CLC Number:

TM73

WEI Zhenbo, WEI Pingan, GUO Yi, HUANG Yuhan, LU Bingwen. Distributed Dispatch Method for Multi-region Electricity-Gas Integrated Energy Systems Considering Cross-region Energy Flow Interaction Plan[J]. ELECTRIC POWER CONSTRUCTION, 2020, 41(12): 68-81.

Figures/Tables 28

Fig.1 Distributed dispatch structure of multi-region electricity-gas integrated system

Fig.2 Decomposition mechanism of multi-region electricity-gas integrated system

Fig.3 Calculating process of S-ADMM algorithm

Fig.4 Two-region electricity-gas integrated system with 12 nodes

Table 1 Optimization result of a two-region electricity-gas integrated system with 12 nodes

Fig.5 Convergence process of the algorithm

Table 2 Comparison of different operation strategies with two-region electricity-gas integrated system with 12 nodes

Fig.6 Energy flow interaction plan of the tie-line and the tie-pipe

Table 3 Optimization result of a three-region electricity-gas integrated system

Table 4 Comparison of interconnecting method with three-region electricity-gas integrated system

Fig.7 The relationship between wind curtailment power,operation cost and peak-valley difference of the tie-line

Fig.8 Plots of wind curtailment power and tie-line power in region 1

Table B1 Parameters of thermal units in calculation example one

Table B2 Parameters of tie-lines in calculation example one

Table B3 Parameters of gas source in calculation example one

Table B4 Parameters of intra-regional energy convertors in calculation example one

Table B5 Parameters of pipelines in calculation example one

Table B6 algorithm Initial values and parameters in calculation example one and two

Fig.B1 Prediction of electric load and wind power in each region

Fig.B2 Prediction of gas load in each region

Fig.B3 Profile of units output under various modes

Fig.C1 Prediction of electric load and wind power of each region

Fig.C2 Prediction of natural gas load and of each region

Fig.C3 Convergence process of algorithm

Table C1 Parameters of gas source in calculation example two

Table C2 Parameters of tie-lines in calculation example two

Table C3 Coupling element related parameters in calculation example two

Table C4 Parameters of pipelines in calculation example two

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