考虑联络线利用率与储能寿命特性的海岛微电网优化运行策略

Optimal Operation Strategy of Island Microgrid Considering Tie-Line Utilization and Energy Storage Life Characteristics

并网型海岛微电网与主网通过联络线互联,如何合理利用储能系统和联络线是海岛微电网与主网优化互动的关键。本文提出一种综合考虑联络线资产利用率和储能寿命特性的海岛微电网优化运行策略,采用随机机会约束描述自然资源和负荷的不确定性,使用蓄电池吞吐量寿命模型描述充放电和荷电状态对蓄电池寿命的影响,在避免储能频繁充放电的情况下,提高联络线的输送电能,降低传输功率波动性,从而提高其资产利用率。为综合考虑储能寿命和联络线资产利用率指标,本文采用目标隶属度函数,利用最大化满意度指标法将多目标问题转化成单目标进行优化求解。最后基于南麂岛微电网进行算例分析,验证了所提方法的正确性与有效性。

The grid-connected island microgrid is interconnected with the main grid through a tie line.How to reasonably use the energy storage system and tie line is the key to the optimal interaction between the island microgrid and the main grid.This paper proposes an optimal operation strategy of an island microgrid that comprehensively considers tie-line asset utilization and energy storage life characteristics.Random chance constraints are used to describe the uncertainty of natural resources and loads,and battery throughput life models are used to describe charging and discharging and the impact of the state of charge on the life of the battery.In the case of avoiding frequent charging and discharging of energy storage,improving the transmission power of the tie line,and reducing the volatility of the transmission power,the tie line asset utilization is expected to be improved.In order to comprehensively consider the energy storage life and tie-line asset utilization index,this paper adopts the target membership function and uses the maximization satisfaction index method to transform the multi-objective problem into a single objective for optimal solution.Finally,a numerical example is analyzed based on the Nanji Island micro-grid to verify the correctness and validity of the proposed scheme.