Interior structure of quality control center on the low‐voltage side for customized power quality service in FRIENDS

Self Cite

SUMMARYThe authors have proposed a new concept of a distribution system "Flexible, Reliable and Intelligent ENergy Delivery System (FRIENDS)" with intent to solve imminent operating problems faced by utilities in providing their customers with reliable supply of power at several levels of quality. The main idea of FRIENDS is to introduce new facilities, so-called Quality Control Centers (QCCs), which are installed very close to the customers for the purpose of implementing multiple functions, such as Customized Power Quality Service. In addition, these QCCs form a network for energy and information transmission at a level below distribution substations. QCCs make it possible to frequently change configuration of the network depending on the system and load conditions. These frequent reconfigurations of the network require fast and reliable Transfer Switching in the QCCs to ease an effect on customers. The reconfiguration for the purpose of fault area isolation also requires a fast Fault Detection feature. This paper presents a new method for controlling Transfer Switching and a method of Fault Detection in order to realize a fast and reliable reconfiguration of QCC network in a normal state, as well as under fault conditions. This paper also analyzes the methods in terms of instantaneous values calculated by PSCAD/EMTDC.

Section: Transfer Switching Equipmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A study of transfer switching for the purpose of fault detection in FRIENDS

Suzuki

Hara

Kita

et al. 2004

Self Cite

“…1, many QCCs [5,6] of appropriate capacity are installed in each different power supply area, and QCCs are connected by a mesh of high-voltage distribution lines so as to receive power from multiple power substations. Customers receive power directly from the QCCs.…”

Section: Outline Of Network Configuration Problem In Friendsmentioning

confidence: 99%

“…Regarding FRIENDS, there have been wide-range fundamental studies, including such topics as the detailed configuration of QCC [5,6], the configuration of high-volt-age distribution networks [7,8], the economic analysis of unbundled power quality services [9], and so on. The authors have investigated methods for optimal configuration of the FRIENDS network which is a large-scale combinatorial optimization problem and is difficult to solve by conventional methods.…”

Section: Introductionmentioning

confidence: 99%

Optimal network configuration of FRIENDS taking power supply reliability into account

Nara

Satoh

Mishima

2006

SUMMARY FRIENDS (Flexible, Reliable and Intelligent ENergyDelivery System) is a new concept for a future power delivery system in which so-called QCC (Quality Control Center) plays an important role to realize the customized power quality services and to connect a large number of distributed generators to distribution systems. In FRIENDS, QCCs are connected as a network through distribution cables to realize a reliable power supply. In this paper, a method to find the optimal network configuration of FRIENDS is proposed. The method can minimize the sum of facility installation cost and operational cost (distribution loss) under the constraint that the expected power interruption cost is less than a predetermined endurable value. The solution algorithm is based on tabu search, and employs a sensitivity analysis to select efficient facilities to be installed or to eliminate constraint violations. In the algorithm, single and double faults of power distribution system are taken into account to calculate the power supply reliability or expected power interruption cost. Several numerical real-world examples are shown to demonstrate the validity of the algorithm.

“…1 and called a Quality Control Center (QCC) that is set up in several locations between the distribution transformer and consumers. The authors have already analyzed the interior structure, which is based on a circuit configuration using UPS (uninterruptible power supplies) and control methods [3,4]. In the current paper, the authors propose a new QCC interior structure [called a UPQC (Unified Power Quality Controller) QCC] based on the circuit configuration for a Unified Power Flow Controller (UPFC).…”

Section: Introductionmentioning

confidence: 98%

Interior structure of UPQC‐type QCC at the low‐voltage side in the FRIENDS

Noda

Wang

Kita

et al. 2003

Self Cite

SUMMARYRecently, the worldwide deregulation of the electric power industry is progressing. Further, it is expected that a many distributed generation facilities and energy storage systems will be installed at the end point of the power systems. Therefore, the future power system must be able to cope with these various qualities of power in the deregulated situation. The authors have proposed the FRIENDS (Flexible, Reliable, and Intelligent ENergy Delivery System) concept as a new distribution system that copes with a new framework of the electric power business in the near future. The most typical aspect of FRIENDS is the introduction of new equipment; Quality Control Centers (QCC) between distribution substations and customers. In this paper, the authors propose a concrete interior structure and investigate some control methods for realizing unbundling power quality supply and power conditioning using the proposed UPQC-type QCC. The effectiveness of the proposed method is confirmed through the instantaneous value analysis using PSCAD/EMTDC.