A STUDY ON OPTIMAL LOAD TRANSFER OPERATION IN LARGE-SCALE URBAN DISTRIBUTION SYSTEMS

1.针对大型城市配电网在电压降和电流容量约束下的停运负荷恢复问题，基于(1)原始有效梯度法、(2)对偶有效梯度法、(3)(1)和(2)统一算法，提出了三种算法。结果已发表在IEEE关于PWRD的会刊和日本电气工程师学会会刊(IEEJ)上。在上述负荷恢复算法中引入了优先负荷恢复的概念。在新的算法中，为了尽可能地恢复优先负荷，还引入了对签约用户的非紧急负荷进行断电的节电措施。结果已提交给IEEJ会刊，并已在媒体上公布。提出了一种在初始构型和目标构形已知的情况下确定荷载传递顺序的算法。结果有…在IEEJ年会和IEEJ电力系统工程技术会议上发表了更多的论文，并提交给IEEJ学报。在负荷转移分段开关操作的基础上，提出了一种电压降和电流容量约束下的分段负荷测量算法。研究结果已发表在IEEJ学报上。提出了一种变压器负荷平衡算法，用于寻找开环径向配电系统中分段开关的合适正常开路位置。结果已发表在IEEE关于PWRD等的会刊上。针对大规模放射状城市配电网的单周期配电网规划问题，提出了一种基于Lp灵敏度因子进行支路交换的近似求解算法。研究结果已发表在IEEE关于压水堆的会刊上。此外，为了提高计算效率，提出了一种基于电路理论的灵敏度计算方法，取代了线性规划中的枢轴运算。结果已经提交给IEEJ会刊。提出了一种求解大型城市配电网多时段扩展规划问题的近似算法。该算法有效地利用了上述单周期扩展规划算法。该算法还在不断完善中。中期结果已提交给IEEE PES夏季会议。较少

1. In order to solve the outage state load restoration sequence for large-scale urban distribution systems under the voltage drop and current capacity constraints, three algorithms have been developed based on (1) primal effective gradient method, (2) dual effective gradient method, and (3) unified approach of (1) and (2). The results have been published on The IEEE Transactions on PWRD, and The Transactions of The institute of Electrical Engineers of Japan (IEEJ).2. The concept of priority load restoration is introduced to the above load restoration algorithms. In the new algorithm, in order to restore the priority load as much as possible, the electrical energy saving by de-energizing non-urgent load of the contracted customer is also introduced. The results have been submitted to The IEEJ Transactions, and it is in the press.3. An algorithm has been developed for determining the load transfer sequence, when the initial configuration and the objective one are known. The results have … More been presented at The Annual Meeting of IEEJ and The Technical Meeting on Power System Engineering of IEEJ, and submitted to The IEEJ Transactions.4. Based on the load transfer sectionalizing switch operations, a section load measurement algorithm has been developed under the voltage drop and current capacity constraints. The results have been published on The IEEJ Transactions.5. A transformer load balancing algorithm has been developed, which finds the suitable normal open positions of sectionalizing switches in an open loop radial distribution system. The results have been published on The IEEE Transactions on PWRD, etc.6. An approximate solution algorithm for a single-period distribution system planning problem of large-scale radial urban distribution systems has been developed, in which the branch exchange has been executed based on LP sensitivity factors. The results have been published on The IEEE Transactions on PWRS. Moreover, in order to improve the computational efficiency, a sensitivity calculation method based on the electric circuit theory, instead of the LP pivot operation, has been developed. The results have been submitted to The IEEJ Transactions.7. An approximate solution algorithm for a multi-period expansion planning problem of large-scale urban distribution systems has been developed. The algorithm efficiently utilizes the above single- period expansion planning algorithm. The algorithm is still in improving process. The intermediate result has been submitted to The IEEE PES Summer Meeting. Less