基于改进MLC的含DG配电网损耗分摊研究

Loss allocation of distribution network with distributed generationsbased on improved marginal loss coefficients method

分布式电源(DG)接入后,配电网的损耗分摊问题变得更加复杂,基于比例系数的边际损耗系数(MLC)法在含DG配电网中应用时存在市场成员分摊差距过大的情况,分摊缺乏合理性。文中采用基于比例系数的MLC法计算含DG配电网的网络损耗分摊量,将正、负网损分摊量取绝对值求和,在此基础上重新计算各负荷的网损分摊量;然后,考虑网损分摊量总和与实际总损耗平衡的等式约束,利用奖惩系数,增加正网损分摊量,减少负网损分摊量,联立方程求解奖惩系数值,并对网损分摊量进行修正,改进后的方法可以避免正、负分摊量相互抵消,减小成员的分摊差距,合理分摊配电网中产生的损耗;最后,基于IEEE 33节点系统算例进行损耗分摊结果分析,结果表明,所提方法能够作为DG接入配电网的损耗分摊依据。

The access of distributed generations(DGs)leads to the loss allocation problems of distribution network(DN)becoming more complicated.When the marginal loss coefficients(MLC)method based on the proportional coefficients is applied in DN with DGs,the allocation gap between market members is too large,leading to lack of rationality.Firstly,the absolute value of the positive and negative network loss allocation calculated by the proportional method are summed.And then,based on this sum,the network loss allocation of each load bus are recalculated.Secondly,considering the equality constraints between the total loss allocation and the actual total loss,the reward and punishment coefficients are used to increase the positive network loss allocations and reduce the negative network loss allocations.The reward and punishment coefficients are obtained by solving the constructed equations and applied to correct the initial network loss allocations.The improved method can avoid the offset of positive and negative allocation,reduce the allocation gap of members,and reasonably allocate the loss in DN.The results which are obtained by IEEE 33-bus system show that the proposed method can be used as a reference for loss allocation of DN with DGs.