含风储主动配电网与输电网协同的机组组合

Coordinated Unit Commitment of Coupled Transmission and Distribution Systemswith Integrated Wind Powerand Energy System

随着配电网逐渐接入越来越多的分布式可再生能源,以及为接纳这一新能源而配置储能等主动应对措施,传统的输电网与配电网割裂的机组组合模式容易因二者发电计划协调性不足而影响可再生能源发电的充分消纳.对此,本文以风储接入配电网为例,计及电力系统一次调频特性和二次频率调整策略,提出了含风储主动配电网与输电网协同的机组组合优化决策模型及对应的分布式求解方法.该方法以主动配电网与输电网间联络线为分解协调点,解耦构造相对输电网的虚拟负荷和相对主动配电网的虚拟电源.在此基础上,依据增广拉格朗日松弛技术,将协同优化模型分解为输电网机组组合优化决策模型和多个含风储主动配电网运行优化决策模型,然后借助拉格朗日乘子修正策略,驱使含风储主动配电网与输电网机组组合决策以交替迭代的方式趋向可行到最优,完成协同决策.最后,通过简单6节点算例系统验证了本文所提模型和方法的有效性.

With the integration of more and more distributed renewable energy power generation and the configuration of the energy storages in the distribution network,the traditional transmission and distribution split unit commitment is prone to be unable to fully utilize renewable energy power generation due to insufficient coordination of transmission and distribution.To meet this challenge,This paper proposes a distributed method to solve the coordinated unit commitment of coupled transmission and distribution systems taking into account the primary and secondary frequency regulation characteristics.The proposed method first decomposes the power of the tie line into the virtual load relative to the transmission and the virtual generator relative to the distribution network.Then,the models of transmission constrained unit commitment and the economic dispatch of active distribution network with the wind and storage systems are established based on the augmented Lagrange relaxation technique.Finally,with the help of Lagrange multiplier modification strategy,the coordination of the transmission network and active distribution networks with wind storage systems are driven to be feasible and optimal in several iterations,and the optimization decision is completed.Case study with the six-bus system is used to exhibit the effectiveness of the proposed model and method.