考虑微电网接入的主动配电网双层能量管理

Bi-Level Energy Management of Active Distribution Network Considering Microgrid Access

目前微电网的大量接入已经对配电网的安全运行产生了重要影响,基于此背景,本文提出了一种考虑微电网接入的主动配电网双层能量管理模型。该模型包括配电网层与微电网层,其中配电网层以网损最低、电压偏移最小以及功率波动最小为优化目标;微电网层以运行周期内的总成本最低作为优化目标。优化过程采用二阶锥松弛以及线性化方法,将上下层模型分别转换为二阶锥规划和混合整数线性规划问题。最后,通过改进的IEEE-33算例进行仿真分析,结果表明该模型能够兼顾配电网与微电网双方利益,在提高配电网运行安全性的同时减少微电网群的运行成本。

At present,the massive access of microgrid has already had an important impact on the safe operation of distribution network.Based on this background,this paper proposes a bi-level energy management model for active distribution network considering microgrid access.The model includes distribution network level and microgrid level.The distribution network level is optimized from three perspectives:the lowest network loss,the highest voltage quality and the lowest power fluctuation.At the microgrid level,the lowest total cost in the operation cycle is taken as the optimization objective.By using second-order cone relaxation and linearization methods,the upper and lower models are transformed into second-order cone programming and mixed integer linear programming respectively.Finally,the simulation results of an improved IEEE-33 example show that the model can balance the interests of both distribution network and microgrid.The operation safety of distribution network is improved while the operation cost of microgrid group is reduced.