Electric power load management system development using analysis
1 power load management system network mode and the advantages and disadvantages of
Network 1.1 system
System integration of the communication technology, computer technology, automatic control technology for monitoring, the power load management. With the development of power demand side management and communication technology, the system network can be divided into the network, 230M network general packet radio service (GPRS) network, telephone network, cable and optical fiber Ethernet in several ways. Jiangsu electric load management system structure 1
Advantages and disadvantages of each network mode 1.2 system
At present, many systems use wireless communication mode, this mode is greatly affected by geography, environment, climate and other external factors, although can be increased through relay stations to achieve data transmission of large area, but the system of large investment, maintenance quantity is large, and the increase of relay station after the system has large area paralysis trouble. Among the station after the failure, will cause all terminal of the relay station the following can not communicate with center, resulting in a large number of customers lost original data. With the fixed telephone network and mobile network continues to expand, the vast majority of users are the network coverage, so it can be wireless and wired and mobile communication technology organically, mutual cooperation, resolve radio can not cover certain areas of the problem. For example, based on the global system for mobile communication (GSM) data transmission communication short message, the data acquisition and transmission mode is the use of digital mobile communication technology, the installation of a GSM module in each terminal equipment, so that in the client terminal areas far acceptable measurement called master station through the GSM module, the realization of active upload data. Application of cable and mobile communication system enriches the data transmission network system in electric power load management system, makes up the shortage of wireless networking mode. At present, Tongzhou power supply company is part of the research area of wireless signal can not cover caused a lot of terminal communication problems of southwest and northwest two large area solution.
2 the system function and the status quo
2.1 load control
Electric power load control function can be issued an emergency remote trip command to the controlled user, inside short time pressure load, reduce the occurrence of line whole pull electricity. Located in Tongzhou City, a large casting production enterprises, in the peak period of electricity preparations beforehand according to the negative control instruction, the peak of 9280kW reduced to 1850kW, avoid the equipment damage due to a sudden power outage, effectively reduce the economic loss, reduce the load can satisfy 4000 households living electricity, the effectively ease the supply line load rate, reduce the number of emergency power, to assist the peak power, reasonable control of electricity demand, to achieve "maximum power does not pull road", balancing the electricity load has played an important role, both to ensure the normal operation of the grid and orderly use of electricity, and achieved economic and social benefits.
2.2 remote meter reading
(1) for public distribution transformer (DT) of the residential automatic meter reading. Can be achieved on the public distribution on the 10kV line transformer monitoring monitoring system of public distribution transformer data by the user, the existing load management terminal equipment acquisition and monitoring of power supply in the area, and use of existing wireless channels to master unified analysis, treatment. And the distribution transformer monitoring terminal can be used directly as a centralized transponder region near the meter-reading system, saving the investment for single user data collecting system.
(2) centralized meter reading to the user's special transformer.
(3) the system of electricity metering. System of reliable data transmission and information processing technology to ensure data transmission accurate and meter reading data temporal consistency and timeliness, provided modern means for electricity meter reading and clearing. And the use of automatic remote meter reading system of the system of meter reading, can shorten the time of power supply enterprises in electricity charges, accelerate the tariff recovery and the power supply enterprise capital turnover, reduce the manpower and the financial resource expenditure, also can timely discover electricity payment difficulties users, as soon as possible in order to take measures to avoid the tremendous amount of arrears of electricity. Tongzhou city power supply company has the use of load management system for 416 households in the 536 meter remote meter reading, data can be timely and accurately transmitted to the marketing system, save a lot of manpower and material resources.
2.3 tariff reminders
On the function of information users and power consumption under the quantitative parameters and remote control function implementation of tariff reminders of the arrears household electricity use this system, in order to supervise the arrears households early paid owed electricity. After paying system in open electricity, the power enterprises to strengthen the tariff recovery, reduce losses, resulting in a direct economic benefits.
2.4 the measurement supervision and check, anti theft
In practical work, the user meter current transformer (TA), voltage transformer (TV) phase failure occurred from time to time, monitor off or power, power measurement circuit of TV through the system terminal, can determine the condition of user metering device. The system by comparing 48 current, voltage data of all kinds of data measurement table and reference data, using the criterion of various forms of real-time, accurately judge the electricity abnormal situation, on the gauge anomaly information timely feedback to the Department in charge of electricity metering and defects, such can make up for the metering device can not be real-time monitoring of watt-hour meter and TA and TV abnormal situations, for the enterprise to restore economic losses. At the same time through the system of electric energy metering circuit 24h real-time monitoring, but also timely, accurately, effectively find the electric energy meter of various electricity theft behaviors measurement circuit, power companies to reduce power loss, enhance the comprehensive economic benefits play a role. Such as Tongzhou city power supply company in 2004 using the load control device found a winery measurement loop problem, recover the electricity million yuan; found a chemical fiber company, a brick factory and a number of meter TA or TV phase, its active power 241358kWh, reactive power without 116817kvarh, and timely make up the electricity.
2.5 buy electricity system
System functions by prepaid electricity load management terminal, can realize the customer at any time, at any time to pay electricity "". Electrical charge accounting center through network and bank, the customer is prepaid amount according to the actual price is converted into the corresponding power, transmission to the load management center; load management center will be the prepayment electric quantity value and excess capacity value to load management terminal, the terminal will be deducted according to the preset electric quantity gradually customer power usage, the residual quantity and timing information uploaded to the load management center; the center station based on current market conditions and other external factors, customer electricity reminder or selectively load control.
Implementation of pre-paid power hand will promote the healthy development of benign cycle of electric power enterprises, on the other hand, it will completely change the long-standing habit of electricity. This system can implement the pre-paid electric energy to some of the conditions of the user, to pay the electricity charge credit poor user can be adopted by the terminal according to purchase pre-paid power, power control, to avoid the tariff recovery difficult problem. Intelligent power purchase management using load management system, has a direct, fast and accurate, which can improve the work efficiency, strengthen the user tariff collection efforts, at present Jiangsu province electric power company began to promote this work.
Analysis of 2.6 power quality monitoring and line losses
(1) monitor local small thermal power, small hydropower plant monitoring place online according to the grid system requirements generation, in order to improve the economic benefit of power grid.
(2) monitoring of public distributed change through a terminal can simultaneously monitor the surrounding a number of public distribution transformer, centralized monitoring of export quantity on public distribution, can prevent the public distribution transformer overload and unbalanced three-phase.
(3) the voltage quality monitoring and line losses in line voltage monitoring point, through the terminal real-time monitoring of voltage. Voltage monitoring using load management system, user can reflect the full range of voltage and statistics of the qualified rate of the voltage, voltage using terminals or AC sampling device for monitoring power supply of qualified rate and calculation of multiple harmonics (up to a maximum of 19 harmonic). By means of monitoring points, transformer and voltage measurement points, can analysis to assess the quality of power supply, provide the basis for the line loss analysis and distribution network planning, so as to improve the quality of power supply, improvement of the electric power customer service.
2.7 load forecasting
Power load forecasting including the maximum power load, power load and load curve. The maximum power load forecasting is very important to determine the generation and transmission equipment of power system capacity. In order to supply a reasonable structure to select the appropriate type of unit, and determines the fuel planning, also must forecast load and electricity. Provide data to support coordinated operation of the forecasted load curve can be pumped storage power station's capacity for peak, the research of power system pumping and transmission equipment.
The accuracy of load forecasting of power system depends mainly on the basic data, prediction method, prediction methods, including basic information is accurate, rich is especially important. System through the whole point of monitoring function to grasp the main customer demand law of load, load management center according to the long-term accumulation of customer electricity history data and the load curve forecasting model as the data source, and provide the basis for power load region, in short, long term load forecasting. Electric power enterprises can take on different industry electricity real-time monitoring system using data of the same period, to the user in different years, the same year in different seasons of electricity to classify, master the use of electrical characteristics of users, provide the parameters for the development of medium and long-term load forecasting, short-term. Tongzhou city power supply company load forecasting personnel through systematic webpage can easily query the user each time electrical data, provide the basis for the prediction of.
The 2.8 information service
Chinese characters information through the terminal installation at customer side of the display function and data interface, can realize the electricity policy issued, outage information notice, the monthly electricity and arrearage information release, information and provide personalized service for users.
Load management terminal has a lot of useful data for user and provides the interface for users, statistical analysis of this company's electricity situation, make full use of the terminal data for their own business services. From the terminal can clearly understand the situation, Mine Tanihira electric enterprise use, load factor, power factor, reactive power compensation on the spot without can reduce the energy consumption of enterprises, and the unnecessary expenditure, improve the electricity energy efficiency; at the same time to peak load bearing plays a positive role, there is for the smooth operation of power grid.
The end of 3
The system is used in electricity, saving electricity and security by technical means of power distribution automation implementation plan, also, an important part of power management automation. It is to improve the power grid load curve, load balancing, secure and economic operation of power system played a big role, provides plenty of power grid and electrical parameters measurement and monitoring, business copy, line loss management work. With the development of power system, it will play a more and more important role in the realization of power management in the process of modernization.