考虑频率动态安全的孤岛微网群分布鲁棒调度方法

Distributionally Robust Optimal Scheduling for Island Microgrid Cluster Considering Frequency Dynamic Security

针对孤岛微网群互联运行下的频率安全问题,提出了一种考虑微网频率时空差异的分布式日前调度方法。首先,提出一种微网群联络线功率振荡及摇摆方程等值模型,基于此推导计及频率差异的频率动态安全约束集;其次,建立孤岛微网群两阶段分布鲁棒日前优化调度模型,利用Copula函数及混合范数建模源荷出力不确定性;然后,通过对偶分解法生成孤岛微网的分布式调度模型,利用嵌套的次梯度与列与约束生成法求解。最后,基于改进的IEEE-15节点算例进行仿真,验证模型日前调度策略在提高孤岛微网群频率安全性上的优势。

Aiming to address the issue of frequency security in the interconnected operation of island microgrids,we propose a distributed day-ahead scheduling method that takes into account the spatial and temporal differences in frequency between the microgrids.Firstly,we introduce an equivalent modeling power oscillation and swing equation for the tie-lines of interconnected microgrids.Based on this,we derive a frequency dynamic security constraint set that considers the frequency differences.Secondly,we establish a two-stage distributionally robust optimization model for the day-ahead scheduling of the island microgrid cluster by using the uncertainty of the source-load output using the Copula function and mixed norm.Subsequently,we formulate the distributed optimization model of the microgrid using the dual decomposition and solve it through a combination of the sub-gradient and column and the constraint generation methods.Finally,we conduct simulations using the modified IEEE-15 node system to verify the superiority of our day-ahead scheduling strategy in enhancing the frequency security of the interconnected island microgrids.