基于频率偏差的跨区电网交易偏差电量责任判定及定价方法

摘要

跨区电网电力交易中,偏差电量及其合理定价是交易结算中亟需解决的重要问题,直接关系到交易各方的经济利益和公平性.文中提出一种基于频率平均偏差的跨区交流电网偏差电量责任判定模型及定价方法,构建了用于联络线偏差电量责任判定的“米”区图.电网交易中心在各交易日通过电网调度和关口电量表调取相关数据,获取区域间分时间段统计的实际交换电量,并计算该时段中频率偏差平均量和偏差电量,根据该交易日各时段频率平均偏差及电量偏差的运行点在“米”区图中所处的8个不同区位判定该时段偏差电量责任方,并确定相应责任程度等级,然后根据偏差电量责任方和责任程度确定不同的惩罚电价,日清月结,进而实现对跨区电网交易合同电量与偏差电量的差异化定价和分开结算.通过实际算例分析验证了方法的有效性.%In the cross-regional grids electricity transaction,deviation electric quantity and its reasonable pricing is an important problem demanding prompt resolution,which is directly related to the economic interests and fairness of the parties to the transaction.A novel method is proposed to determine the responsibility and pricing for the deviation electric quantity of cross-regional AC grids based on frequency average deviation.The power exchange center can get the relevant data through power network dispatching and gateway electricity meter every trading day to obtain inter-regional exchanging electricity quantity in each time interval.The deviation electric quantity along with the frequency average deviation in that time interval are calculated.The "米" shaped diagram of tie line deviation electric quantity can be drawn via frequency and electric quantity deviation in each time interval of the trading day.The responsibility party and the corresponding responsible level of deviation electric quantity are determined according to the operating point of each time period in the different eight areas of the "米" diagram.Then the different penalty prices of deviation electric quantity are set on the basis of the deviation responsible party and its level,settling accounts monthly by clearing daily.Thus the pricing differences and separate settlement between the cross-regional grids trading contract electric quantity and deviation electric quantity are realized.Simulation results show the feasibility and effectiveness of the method.