2006 International Conference on Power System Technology
Study and Application of Distribution
Automatic System in the Yangiaping Power Supply Bureau
Zhihong Liu, Guozhi Mao, Huaxing Yu, Wenjun Zhou
Abstract-- The power distribution automatic system in the Yangjiaping Power Supply Bureau is a set of genuine power distribution information integration control system, consisting of several organic parts including power distribution network realtime monitoring, feeder automation (FA), power distribution geographic information system (GIS), power distribution flow management system, power distribution information WEB release system and so on.
From the angle of the analysis of the structure of the power distribution automatic system, this article introduces the
functions and features of the power distribution automatic
system. The power distribution network real-time monitoring
system has realized the remote real-time monitoring, operation
and management of power distribution equipment within main
urban zone range and especially played an important role in
preventing management from maloperation. Feeder automation (FA) has realized complex power distribution and the functions such as fault detection, fault identification, fault automatic location and isolation, and fast recovery of power supply in nonfault area under multi-point different current statuses and complex network structure; has realized the remote modification fixed value function of power distribution terminal (FTU); power distribution geographic information system (GIS) has realized geographic map based "electronic power distribution network" as well as the communication with SCADA system; power distribution flow management system has realized the vitrification and process-enabling of the production and management of power distribution flow as well as the electronic transfer of power distribution drawings; power distribution information WEB system has realized the function of user's access of "digital network" via Intranet/Internet in any place at any time.
The implementation of the power distribution automatic system has made the Power Supply Bureau realize the more accurate and effective management of 10KV power distribution and finally radically improved the technological level of power distribution management and advanced the reliability of power supply and the quality of customer service.
Index Terms-- Distribution automatic system; SCADA; power distribution geographic information system; power distribution management;secondary safety isolation; fault location, fault isolation, system recovery operation
The power distribution network in the Yangjiapin
Power Supply Bureau is provided with 17 power stations, 13 110kv power stations, 90 10kv switching stations and 347 10kv feeders at present. Within the jurisdiction area, there are 252,160 electricity users, including 1,710 large users and 250,450 small users. With the area of only 194.3 square kilometers, the jurisdiction area belongs to typical urban power supply network..
The power distribution automation project to be
implemented this time includes 54 1OKV feeders, 42
switching stations, 39 ring net cabinets and branch boxes and 7 IIOKV power stations, which satisfies the requirements of power distribution automation and management automation within the range of lOkV supply area in the Yangjiaping Power Supply Bureau. The project began to be constructed in 2003 and all the construction tasks were completed in December 2005.
The power network in Yangjiaping Power Supply Bureau
belongs to typical urban power supply network, with the
current implementation mode of feeder automation.
The power distribution automatic system in the
Yangjiaping Power Supply Bureau uses hierarchical structure
and master station - substation layer - power distribution
terminal structure including terminal layer, substation layer,
communication layer and master station layer and gradually
realizes the functions such as power station looped network,
looped network in residential area and the SCADA, FA, GIS
and power distribution management of user engineering, etc.
Terminal layer
Terminal layer finishes the data acquisition of switch and
enforces the control command of corresponding equipment.
This system provides rich data for the data statistics and
analysis of master station by using NARI DAT-1 series FTU
as acquisition module.
Substation layer
Substation layer is in charge of collecting data from
terminal layer and transmits data to master station layer, and at
the same time, transmits the command sent by master station
layer to terminal layer.
Communication layer
Communication layer is in charge of finishing the
connection of acquisition terminal with substation and
distribution master station system. All the acquisition modules are connected to optical fiber backbone network via optical Modem by RS485 mode, finally converged into substation, and then delivered to master station by network mode.
When some system components fall into failure and the
operation constraints are violated, the HALLSS model
consisting of local generation rescheduling, local Var
compensators adjustment and local load curtailment is carried
out. In these control actions, the following heuristic rules are
used.
Fig. 1 The structure of communication system for distribution automation
Because power distribution automation has close
relationship with the structure and primary equipment of
power distribution network, the interface between power
distribution primary equipment and power distribution
automation equipment shall be taken into account, provided
that reasonable network frame structure is fully taken into
account.
Monitoring of switching station, ring net cabinet and branchbox
Features of switching station, ring net cabinet and
branch box:
1OkV outdoor box type ring net cabinet is also called
looped network power supply unit (called ring net cabinet for short). Each looped network power supply unit consists of 3 to 5 switches. The flexible connection modes can satisfy the requirements of different power distribution network nodes.
The switchgear type of switching station mainly uses
vacuum breaker cabinet and load switchgear. Switching
station generally uses 2-in 10-out. The inlet switch of
switching station can be provided with load switch. The outlet switch of switching station can be provided with load switch or breaker, which can be determined according to the property of outlet.
Control features
The outlet fault in switching station is removed by the
protection action of starting aside outlet breaker. The power
distribution terminal DTU of switching station sends fault
information to power distribution master station. After
identifying fault point, power distribution master station
realizes the isolation and recovery of fault by controlling DTU. If load switch is installed on the inlet of switching station (ring net cabinet, branch box), the fault in switching station (ring net cabinet, branch box) is removed by the power station protection action of starting aside outlet breaker and then isolated and recovered by DTU. Fig. 1
Fig. 2 The structure of monitoring of switching station
Monitoring of pole mounted switch
Features of primary equipment: Fig. 2
The oil less switching equipment with high reliability,
excusable overhaul, less maintenance, motorized operation
and less shutdown shall be used. The pole mounted switch of Yangjiaping area is mainly the pole mounted switch of ABB.
Control Mode
The switching equipment basically consists of three parts
including pole mounted switch, pole mounted PT or CT set
and power distribution terminal. Power distribution terminal
consists of FTU controller, communication unit and battery.
The whole equipment shall finish the SCADA function
(Analog Input, Digital Input, Digital Output, active energy
metering) under normal circumstance and the DA function
under fault circumstance.
Fig. 3 Structure chart of distribution terminal
The database and real-time server hardware of distribution master station system use HP DS25 server, with high reliability and retractility, and use MSA1000 disk array. In MSA1000 disk array, RAID5 is provided and specially used for data storage, which ensures the reliability of system data. The operation system uses HP-COMPAQ True64 and the cluster technology with high availability, in order to ensure load balance and seamless fault switch and make the system real-time, usable and stable. GIS server uses HP DS25 server, in order to ensure the reliability of GIS server
Fig. 4 Structure chart of main station
The functions of the DMS system mainly includes power
distribution monitoring (SCADA) function, feeder automation (DA)function, power distribution geographic information (AM/FM/GIS) function, power distribution flow management (WMS)function and interface function.
Fig. 5 Software structure chart of master station
Monitoring (SCADA) function of power distribution
Network: Fig. 5
The power distribution network shall perform data dead
band identification, limit value identification, statistics
processing, data calculation processing, data retrospection
processing and data storage processing; respond to the data
request command of man-machine interface and transmit the
remote control command sent by man-machine interface to
communication server; dynamically track the change of
power distribution network topology, correctly and rapidly
analyze the electrification state of the primary parts in power
distribution network model and provide basis for dynamic
pigmentation and fault isolation and recovery; respond to the
board hanging command request on earthing, overhaul, circuit, danger, etc. sent by man-machine interface to according to the electrification status of all parts, provide information for dispatchers and maintain the safe and high efficiency operation of the whole power distribution network; generate various events such as analog input over limit, protection action, return, etc and provide rich and reliable information for dispatcher's power distribution network monitoring and control.
Maloperation prevention function of power distribution network:
The power distribution automatic system has powerful
maloperation prevention function. Yangjiaping power
distribution network is very complex, which brings big risk to the management and operation of power distribution network. The power distribution automatic system can directly show the real-time status of power distribution network, provide real-time monitoring information, and transmit the real-time analog input and digital input information that manages automation power distribution network.
The dispatcher and the operation personnel of power distribution operation team can comprehensively and directly master the real-time operating state of power distribution system equipment.
By utilizing the electrification pigmentation and board hanging (overhaul, earthing, danger board) functions on the
power distribution network chart of power distribution
automation master station, management personnel shall set
switch opening and closing position and place boards in
power distribution network chart according to daily power cut overhaul order. Management personnel can inquire about the hanging of "earthing board" or "circuit work board" of the whole power distribution network by "operation management" function. In the face of complex power distribution network on screen, management personnel can accurately know the power supply range of a power distribution circuit through power supply path" and "power supply range" functions. To facilitate management personnel's accident management ability, fault point can be set by accident preview function and fault optimization scheme can be given. By this function, management personnel can perform accident assumption, which improves accident management ability.
To make management personnel master the typical
operation mode and real-time state of power distribution
network, automation personnel not only expresses typical
break points with different colors in network chart, but also
explore the implementation of "typical mode" together with
technology personnel from the system provider. Dispatcher
can understand the typical mode and real-time state of the
network at any time.
Maloperation prevention function of power distribution network:
The feeder automation function includes 1OKV feeder fault automatic detection, fault automatic location, fault automatic isolation and rapid recovery possibility of power supply for non-fault section. remote load transfer and network reconfiguration function.
Geographic information management function of
power distribution network:
The power distribution GIS system in Yangjiaping Power
Supply Bureau is an integral part of the power distribution
automatic system.
The AT-Power of ADAM software is designed and developed for power distribution network, with good stability and practicability.
■ Equipment management function of AM/FM/GIS:
During the production and management of the power
distribution system in the Yangjiaping Power Supply Bureau, a accurate "digital network" model is constructed to describe the actual operation status of power network, which is the foundation of all the applications of the system. At present, the complete entry and dynamic modification of power distribution equipment has been realized and the "digital" management of power distribution network has been basically realized.
Space equipment inquiry and statistics function:
Power distribution GIS system provides user with space
equipment inquiry and statistics function, and finishes
''graphics-data" and "data-graphics" inquiry by any inlet,
depth and direction through the relationship among
geographic map, subject image and attribute database
information and realize the integrated operation of graphics
management and data management.
* Solving the problem of mass data processing:
In 6,681 poles, 2,409 transformers, 751 power distribution
rooms, 95 switching stations and 17 power stations, database
capacity has reached 400M. With mass data, the processing
speed of the system is still high.
* Power distribution flow management function:
Service processing support platform uses "work flow"
technology, so that the system can perform convenient and
flexible adjustment for service processing flow in the process of operation. Via special service flow management tool, authorized user can manage the business links of service flow and the responsible roles of business links and the circulation relationship among business links, in order to realize production flow management. At present, the system has realized: overhaul plan, overhaul application order, application for new equipment operation, on-line filling in, approval and circulation of equipment change report and the flow management of overhaul plan and overhaul application order. By utilizing the three functions including operation
instruction order management, duty record and shift relief
management and brownouts management in management
operation module, manager standardizes daily work record
system, which lightens manager's workload. During operation instruction order management, the
functions including operation order classification, typical
operation order management and import overhaul application order has been provided, which provides convenient approach for manager's filling in operation order form. During brownouts management, the module management of brownouts order form has been realized, the functions including the automatic generation, convenient filling out and automatic calculation of order form and the statistics function have been provided, which provides ccurate basis and guidance for manager's brownouts management and convenient statistics and inquiry.
To sump up, the power distribution automatic system in the
Yangjiaping Power Supply Bureau builds a "digital network" by utilizing advanced computer technology. It can be used for real-time and direct mastery of the information of power network system and assisting personnel in service
management and decision, for the purpose of performing
effective and scientific management for power network,
improving management quality and operating efficiency,
reducing operation cost and ensuring the reliability of power
5 supply.
| [1] | Y. Yuanbo., "Study of the Network Reconfiguration of Post-fault Power", 2002. |
|---|---|
| [2] | F. S. G. Yibin, "Study of the Network Reconfiguratio", 2002. |
| [3] | W. J. Zhou Shao, "Current Status and Development of the Network", 2003. |
Zhihong Liu was born in chogqing , China, 1972. He received his BS, MS. degree from Chongqing University of China in 1995, 1999 respectively. He now works in YangJiaPing Power Suply Buereau in Chongqing. His research interests include distribution automation and dispartch automation, relay protection, artificial intelligence application to power system.
Guozhi Mao was born in chogqing, China, 1952. He received his MS degree from Chongqing University of China in 1995 respectively. He now works in in YangJiaPing Power Suply Buereau in Chongqing. His research interests include management at Power Suply Buereau, relay protection.
Huaxing Yu was born in chongqing , China, 1973. He received his MS degree from Huabei Electrical power niversity of China in 1997 respectively. He now works in in YangJiaPing Power Suply Buereau in Chongqing. His research interests include management at Power Suply Buereau.
Wenjun Zhou was born in Shandong, China, 1974. He received his BS, MS. degree from Chongqing University of China in 1997,2000 respectively. He now works in Shandong Jicheng Electronics Co. , Ltd.in Jinan. His research interests include distribution automation and dispartch automation, relay protection.