计及静态安全约束的电-气耦合综合能源系统供电能力评估方法
Load Supply Capability Assessment Method for Integrated Electricity-gas System Considering Static Security Constraints
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摘要: 供电能力反映了电力系统所能承载的最大负荷,即在给定的发电机运行方式下,模拟系统中负荷的增长模式,不断检验系统的安全约束条件,从而确定系统所能供给的最大供电负荷。然而,随着以天然气为一次能源的燃气发电机发电比重的显著提升,传统供电能力评估方法并没有考虑燃气发电机的一次能源供应以及天然气系统的运行约束,显然并不恰当。为此,提出了基于连续多能流的电–气耦合综合能源系统供电能力评估方法。首先,建立了电–气耦合综合能源系统的多能流模型;接着引入负荷增长参数,提出连续多能流方法,通过预测–校正追踪多能流解曲线;最后,将所提方法应用于修改的14节点电力系统和14节点天然气系统,仿真结果验证了所提方法的正确性和有效性。Abstract: The load supply capacity represents the maximum load that can be carried by a power system, and is determined by testing the system’s security constraints in a given growth mode. However, the conventional load supply capacity assessment method is insufficient to consider the recent significant increases in gas-generated electricity, with limited assessments of the energy supplied by gas generators and the security constraints of natural gas systems. Therefore, this paper proposes a load supply capability assessment method that considers static security constraints in integrated electricity-gas systems. First, a multi-energy flow model of the integrated electricity-gas system is established, and then a load growth parameter is introduced to complete the model. The proposed method is applied to a modified 14-node power system and 14-node natural gas system, and the simulation results verify the accuracy of the proposed model, which can be effectively deployed to investigate and improve these integrated energy systems.
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