全网统筹电力电量平衡协调优化方法

大规模互联电网为大范围的能源资源优化配置提供了可能。文中提出了全网统筹电力电量平衡国省两级协调优化的模式、模型与方法。以省级电网的历史贡献率为优先级进行平衡决策,从而促进省级电网参与电力交易的积极性。提出了两种国级与省级电力电量平衡决策目标:一是在电力富余时最小化发电成本;二是在电力紧缺时合理分配电力缺口,实现在时间和空间上均衡缺电。以等效发电成本曲线为关键优化信息,建立了协调优化数学模型,分层决策省间送受电方案和各省发电机组出力计划,实现能源资源的进一步优化调配。提出了以电量受限成本增量修正省级电网发电成本的求解方法,精细考虑火电机组因电量受限所带来的额外成本。基于三区域IEEE RTS96系统和华北—华东—华中(简称"三华")电网的计算充分表明了该方法的有效性。

A Coordinated Optimization Method for System-wide Power Supply-demand Balancing

Large-scale interconnection of power systems has provided the possibility of a wide-range better allocation of energy resources. This paper proposes a novel state-province coordinated pattern, model and method for power supply-demand balancing over the whole system. Balancing decision-making is performed based on historical contribution of provincial grids to stimulate power exchanges. Two power supply-demand balancing schemes are proposed, to minimize generation costs if power demand can be met, or otherwise, to achieve temporal and spatial equilibrium when facing power shortage. By taking the equivalent generation cost curves of provincial grids as the key optimizing information, coordinated optimization models are developed to optimize power exchange schedule between provincial grids and generation schedule of units, resulting in better allocation of energy resources. An algorithm is proposed to precisely take into account the extra cost due to limited energy output from thermal units. Computational results of 3-area IEEE RTS96 system and a large-scale real power system are presented to verify the effectiveness of the method. This work is supported by National Key Technologies R&D Program (No. 2013BAA01B02), National Natural Science Foundation of China (No. 51407100) and Post-doctoral Science Foundation of China (No. 2014M560969).