基于二阶段鲁棒博弈模型的微电网群及混合交直流配电系统协调能量管理策略研究
A Two-stage Robust Game Approach for Coordinated Energy Management in Hybrid AC/DC Distribution System With Microgrid Clusters
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摘要: 随着可再生能源技术的迅速发展,微电网及其群落出现在配电网中。高渗透率的可再生能源给配电系统带来较高的不确定性,此外,多市场主体下的复杂博弈关系,在系统层面进一步加深不确定性的影响。然而,具有高灵活性和可控性的混合交直流配电系统为解决上述问题提供了有效途径。基于此,该文提出一种基于二阶段鲁棒博弈模型的混合交直流配电系统协调能量管理方法,该方法旨在协调混合交直流配电网与微电网群间的功率交互,通过寻找模型的均衡点,可为每个市场主体提供最佳的能量管理决策,实现各方收益的均衡化,促进电力市场开放和发展。除了考虑经济因素外,为了抑制可再生能源出力不确定性对电力市场主体间功率交互的影响,在模型中还增加了鲁棒优化,通过对交直流变流站的优化控制与实时管理,抑制不确定性对系统稳定性的影响,实现配电系统安全经济运行。最后,通过对改进的IEEE-33节点混合交直流配电系统算例进行分析可知,所提方法实现了各方主体收益的均衡化,并能维持系统电压在规定范围内,有效实现了配电网与微电网的协调发展。Abstract: With the rapid development of renewable energy technology, microgrid and its clusters appear in the distribution network. The high permeability of renewable energy brings the uncertainty of distribution system, which cannot be ignored. In addition, under the open power market the complex game relations further deepen the influence of uncertainty at the system level. However, the hybrid AC/DC distribution system with high flexibility and controllability provides an effective way to solve the above problems. In this, this paper presented a coordinated energy management method for hybrid AC/DC distribution system based on two-stage robust game model. The method was designed to coordinate the energy interaction between hybrid AC/DC distribution network and microgrid clusters, by finding the equilibrium point of the model, the optimal energy management decision can be provided for each stakeholder, which realize the equalization maximization of benefits of all parties and promote the opening and development of the power market. Except economic factor, in order to restrain the influence of the uncertainty of renewable energy output on the power interaction between power market subjects, this paper also added the robust optimization in the model. By optimizing the control and real-time management of the AC/DC converter stations, the influence of the uncertainty on the system stability was suppressed to realize the safe and economic operation of the distribution system. Finally, through the modified IEEE-33 node hybrid AC/DC distribution system numerical example analysis, the results show that the proposed method has achieved the equalization maximization of all parties’ main income and maintain the system voltage within the specified range, effectively achieve the balanced development between the distribution network and the microgrid.