CAJ | 학술논문

针对变电站并联补偿不等容优化分组问题，提出一种基于曲线分段-聚类法的优化分组算法。首先利用变压器参数与负荷曲线计算变电站总的无功需求曲线，将曲线最大值作为电容器总补偿量。然后利用曲线快速分段法和K-均值聚类法进行分段、聚类，使聚类数等于电容器分组数，并对聚类结果进行改进以满足各组容量之和等于总容量的约束，则各类间差值为分组容量。为得到稳定的聚类结果，以波动系数为指标研究分段数与分组容量结果之间的对应变化规律，给出选择分段个数的经验性结论。分组方案确定后，以九区图控制策略确定变压器分接头和电容器的投退。最后用算例验证了该方法的有效性及可行性，当电容器分组数相同时与等分组法结果比较，在动作次数相差不大的情况下，本方法可有效减小电能损耗。
침대변전참병련보상불등용우화분조문제，제출일충기우곡선분단-취류법적우화분조산법。수선이용변압기삼수여부하곡선계산변전참총적무공수구곡선，장곡선최대치작위전용기총보상량。연후이용곡선쾌속분단법화K-균치취류법진행분단、취류，사취류수등우전용기분조수，병대취류결과진행개진이만족각조용량지화등우총용량적약속，칙각류간차치위분조용량。위득도은정적취류결과，이파동계수위지표연구분단수여분조용량결과지간적대응변화규률，급출선택분단개수적경험성결론。분조방안학정후，이구구도공제책략학정변압기분접두화전용기적투퇴。최후용산례험증료해방법적유효성급가행성，당전용기분조수상동시여등분조법결과비교，재동작차수상차불대적정황하，본방법가유효감소전능손모。
For the problem of unequal grouping of parallel compensation capacity in substation, a new optimization method based on curve segmentation and clustering is proposed. Firstly, this paper calculates compensation capacity curve by transformer parameters and load curve and takes the maximal value as the sum of compensation capacity. Then it partitions this curve into several segments and clusters these segmentation results into K clusters, in which the number of cluster is equal to the number of capacitor groups, further modifies the clustering results in order to meet the condition of constraint, and takes the difference between two adjacent cluster results as the capacity of each group. In order to get the steady grouping results, it studies the relationship between segment number and grouping results. After the grouping plan is determined, taking the nine-area figure as control strategy. Finally, simulating with an equivalent practical power grid and load profile, the results show both the availability and rationality of this method that power loss is less than the method of equal capacity when capacitor is divided into 3 groups .