TY  - THES
T1  - Voltage and reactive power control optimization in a distribution substation using dynamic programming
A1  - Savet, Froilan J.
LA  - English
YR  - 2003
UL  - https://tuklas.up.edu.ph/Record/UP-99796217607612369
AB  - This paper presents a new method for coordinating voltage/reactive power (Volt-VAr) control in a distribution system by using a dynamic programming (DP) approach. The objective of the proposed method is to coordinate the action of substation on-load tap changer (OLTC) and the switching of substation and feeder capacitor banks (CB) that will result in reduced distribution system loss, improved voltage profile downstream, and less tap changer and capacitor switching operations. Voltage limits of 0.95 to 1.05 per unit are imposed on feeder lines while reactive power flow through the main transformer is quantified based on the ulitity's current power factor (pf) discount/penalty formula.% Given the hourly forecasted real reactive power loads, and the substation-transformer primary voltage, the proper dispatch of the OLTC taps and CB status for the next 24 hours is determined. Loadflow simulations are performed for every tap position-capacitor status combination. Every combination is regarded as a possible state in the sequential, multi-stage decision process. Dynamic programming is implemented to arrive at the final dispatch. To demonstrate the effectiveness of the proposed approach, the dispatch strategy is implemented on a typical Manila Electric Company (MERALCO) distribution substation. Cubao substation's power transformer (PXF) banks 1 and 2 and their associated feeders, are used as test systems and the results are compared with those obtained using the conventional method used by the Meralco System Control Center. The results of the simulations show that an optimized dispatching schedule of Volt/VAr control equipment is indeed feasible using the method proposed in this study. Even with daily load variations, it is determined that the proposed dispatch schedule can effectively coordinate the individual settings of the different equipment. These findings indicate that a dispatch strategy using dynamic programming is an effective tool for System Control; one that does not entail any burden of addtional investment in equipment by the distribution company. The proposed method only requires operator intervention in the control set-up of the OLTC and capacitor banks.
CN  - LG 995 2003 E64 S38
KW  - Electric power systems : Control. : Philippines.
KW  - Mathematical optimization.
KW  - Dynamic programming.
KW  - Electric substations : Philippines.
KW  - Reactive power (Electrical engineering).
ER  -