求解安全约束机组组合的定制化混合分支方法

doi:10.19595/j.cnki.1000-6753.tces.250683

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Abstract

The Security Constrained Unit Commitment (SCUC) problem plays a critical role in ensuring the fairness and economic efficiency of electricity spot market transactions. In electricity market clearing, SCUC is typically formulated as a Mixed Integer Linear Programming (MILP) model, whose solution efficiency heavily depends on the performance of commercial MILP solvers. With the expanding trading scope of the electricity spot market, it becomes increasingly difficult for generalized mixed integer programming solvers to solve large-scale security constrained unit commitment models. With the original intention of solving the neck problem of commercial solver, this study develops a hybrid branching method by exploiting distinctive features of the SCUC physical mode—including binary variable types, generator capacities, temporal sequencing patterns, and cost structures—to customize the branching strategy of the open?source HiGHS solver. he proposed method consists of variable selection rules and a rule switching strategy.
The variable selection rule integrates two complementary components: the capacity hybrid rule and the average cost rule. The capacity hybrid rule integrates unit capacity into the evaluation value of candidate branching variables as weighting factors while resolving decision conflicts among equally evaluation values variables through temporal precedence. When multiple candidate branching variables have identical evaluation scores, those from earlier time intervals are assigned higher branching priority. This dual mechanism accounts for both the magnitudes of evaluation and the different impacts of the temporal interdependencies across multi-interval decision horizons. The capacity hybrid rule serves as the primary variable selection rule within the hybrid branching method and largely dictates its overall efficiency. Unit costs and temporal characteristics are incorporated into the average cost rule, where variables with maximal evaluation values are selected among minimum-cost candidates. This rule has a high probability of generating nodes that can be pruned, diversifies the search paths of the Branch-and-Cut (B&C) algorithm and provides useful information for it, and as a supplementary component within the hybrid branching method.
The rule switching strategy determines the switching conditions between the capacity hybrid rule and the average cost rule for the bottleneck problem of the gap reduction in the branch process. This enables dynamic adjustment of the branching variable selection logic during the solving process through the strategic alternation of variable selection rules. When stagnation in the optimality gap reduction is detected, the hybrid branching method automatically switches the active variable selection rule to steer the B&C algorithm away from local optima. Furthermore, the hybrid branching method refines the candidate branching variable set by filtering variables according to the physical characteristics implied by binary variable types and customizes the application of strong branching to address reliability issues in the branching evaluation scores of candidate branching variables. Simulation results from the IEEE118 bus, RTE1888 bus, and Polish2383 bus systems demonstrate that using the capacity hybrid rule alone without any rule switching for variable selection improves the speed of the HiGHS solver for SCUC problems by 27% to 49%. When the hybrid branching method dynamically switches variable selection rules, the solving efficiency of HiGHS is further enhanced, achieving an overall speedup of 46% to 62% compared to its original performance. The proposed customized method provides a new idea for the development of an independent and controllable security constrained unit commitment solver in China.

Key words： security constrained unit commitment mixed integer linear programming solver branching method open source

Received: 24 April 2025

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	Li Peijie
	Ge Jiawei
	YUAN Muchen
	Xu Shengnan

Cite this article:

Li Peijie,Ge Jiawei,YUAN Muchen等. A Customized Hybrid Branching for Solving Security Constrained Unit Commitment Problems[J]. Transactions of China Electrotechnical Society, 0, (): 1-.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.250683 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/1

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