CN202957659U - Line Loss Measurement and Positioning System Based on High Voltage Electric Energy Meter - Google Patents

Abstract

The utility model relates to a line loss actual measurement and positioning system based on a high voltage electric energy meter, and belongs to the intelligent electrical network power distribution automation field. The line loss actual measurement and positioning system includes a main station and multiple sensor-type high voltage electric energy meter. The main state is provided with a communication module, a data acquisition unit, and a computer. The output terminal of the communication module is connected with the input terminal of the data acquisition unit. The output terminal of the data acquisition unit is connected with the computer. A high voltage power transmission line of a power distribution network with a topological structure is provided with the sensor-type high voltage electric energy meter and each branch line is also provided with the sensor-type high voltage electric energy meter. A communication unit of the sensor-type high voltage electric energy meter is wirelessly connected with the communication module of the main station. Through the integral optimized design and processing, the 6kV-35kV line loss actual measurement is realized, the electric energy can be read, calculated and output directly, the substitution resistance has not to be calculated, the line loss condition and change of the power distribution line can be known accurately in real time, and the error is small. The application scope is wide, the fault points can be eliminated, the line loss management level is greatly improved, the managed line loss is reduced, the electric power leakage and stealing are prevented, and the metering error is reduced. The investment in construction is small, the energy consumption is small, and the economic benefit is improved.

Description

Line Loss Measurement and Positioning System Based on High Voltage Electric Energy Meter

technical field

The utility model belongs to the technical field of distribution automation of smart grids, in particular to a line loss measurement and positioning system based on a high-voltage electric energy meter.

Background technique

The line loss rate is a comprehensive technical and economic indicator of the power system and an important economic indicator of the power sector. The level of line loss rate not only reflects the structural status of a power network and the quality of operation and management, but also reflects the level of technical management of a power sector. Accurate analysis of line loss data, line loss classification, accurate location of line loss points, different types of loss, and distinguishing between normal loss, abnormal loss, and power theft are very important for energy-saving work in power systems. The State Grid Corporation of China attaches great importance to the management of line loss, and has issued the "State Grid Corporation of Power Network Power Loss Management Regulations", which clearly points out that the management of power network power loss should be carried out from two aspects: strengthening management measures and technical measures. Among them, an important aspect of management measures is the management of line loss indicators. It can be seen that to improve the level of line loss management, it is the key to formulate a scientific and reasonable line loss index. For the high-voltage transmission network, due to the complete measurement equipment, the grid equipment parameters and operating data are relatively easy to obtain, the accuracy of the data is high, and the calculation of theoretical line loss and actual line loss statistics are easy to implement. It is relatively comprehensive and true to grasp, and it is relatively easy to formulate a scientific and reasonable line loss index. However, for the distribution network, due to the limitation of various factors such as incomplete measuring equipment, it is difficult or impossible to collect the operation data of the load point accurately, which makes the calculation result of the theoretical line loss of the distribution network different from the real value. On the other hand, it is impossible to accurately count the actual line loss. Therefore, it is still difficult to formulate a scientific and reasonable distribution network line loss index. In addition, the distribution network is directly oriented to users, and the phenomenon of electricity leakage is relatively prominent, which is the main source of management line loss. In recent years, due to various factors such as construction and management, the line loss level of urban and rural distribution networks is still high, and the potential for power saving and loss reduction is huge.

At present, the power supply company’s 35kV and 10kV side distribution network line loss indicators are often compiled based on line loss statistical analysis data, load change trends, load measurement, positioning and theoretical calculation results. In order to improve the line loss management level of the distribution network, the power supply The company usually adopts the following two methods: ① Improve the accuracy of the theoretical line loss calculation of the distribution network by organizing a large-scale load measurement and positioning; for example, the maximum and minimum electric energy The loss measurement method firstly calculates the resistance of distribution network lines and transformers; forms the distribution network node conductance matrix, and obtains the distribution network node resistance matrix. The power consumed by the distribution network is obtained from the block square matrix. Based on the maximum and minimum equivalent resistance of the given distribution network head-end current, the linear interpolation function of the maximum and minimum equivalent resistance between the given distribution network head-end currents is obtained, and each phase is located according to the actual measurement of the distribution network. The magnitude of the current, calculate the maximum and minimum equivalent resistance, and finally calculate the maximum and minimum power loss of the distribution network within a given period of time. Utilizing the method of the utility model, it is possible to determine whether there is electricity leakage or measurement error in the distribution network, and the obtained theoretical power loss upper limit and line loss rate upper limit are used as assessment indicators for reducing line loss in the distribution network. However, the human and material resources involved in this method are huge, and it is difficult to form a normal mechanism. Affected by the current application equipment, at the same time, it is unimaginable for the existing detection methods to carry out load measurement and positioning work for all distribution lines under all working conditions, and it is difficult to implement. Moreover, after the equipment is installed and used, its performance parameters will affect As far as the circuit design capability is concerned, the voltage drop and short-circuit current generated during the measurement will seriously affect the accuracy of the actual measurement results.

② Real-time statistics of the loss of the distribution network by installing a remote meter reading system on the medium-voltage distribution line. Chinese patent application CN201010250593.9 discloses a system and method for calculating the line loss rate of power distribution lines, which is mainly designed to realize the convenience, rapidity and accuracy of the line loss rate calculation of the distribution network. It includes: a power supply collector, which is set on the public line of the substation, and collects the power supply of the distribution line; a sales electricity collection device, including an on-site management terminal, is set on the high-voltage side or low-voltage side of the special distribution transformer side; the terminal collector is set at the low-voltage user end of the public distribution transformer; the low-voltage electricity sales collector is arranged at the low-voltage side of the public distribution transformer; the high-voltage electricity sales collector is arranged at the substation on the distribution line and connected to the on-site management system through an optical cable. The utility model does not need to collect the parameters of each equipment in the power distribution line in advance, but obtains the data of each load end in real time through the electricity sales collection device, and can calculate the line loss rate online.

Method 2 involves a large amount of equipment investment and construction, and the accuracy of its statistics is also easily affected by problems such as load transfers and errors in the multiplication of the metering system when increasing or decreasing capacity. The error of the acquisition device and its own energy consumption are huge, and the communication system is used simultaneously. This method cannot deduct the loss of the special transformer for "high supply and low calculation", cannot detect theft and leakage in time, and cannot provide effective guidance for loss reduction work.

Utility model content

According to the deficiencies in the prior art above, the purpose of this utility model is to provide a line loss measurement and positioning based on a high-voltage electric energy meter that can adapt to various working conditions, requires less investment and construction, has small errors, low energy consumption, and is flexible to use. system.

The technical scheme adopted by the utility model to solve its technical problems is: a line loss measurement and positioning system based on high-voltage electric energy meters, which is characterized in that: it includes a master station, an operating terminal and a sensor-type high-voltage electric energy meter through the public network/ad hoc The network constitutes a power data cloud system; the master station is equipped with a communication module, a data acquisition unit, and a management platform composed of servers, software systems, and front-end machines. The output end of the communication module is connected to the input end of the data acquisition unit, and the output end of the data acquisition unit Connect the server; the sensor-type high-voltage electric energy meter set on the total circuit point, each branch point, each associated load point and each single-phase end point of the topology distribution network, the sensor-type high-voltage electric energy meter includes at least Electrically connected high-voltage voltage sampling loop, high-voltage current sampling loop, source loop, voltage stabilization unit, data processing measurement unit, display unit, communication unit and clock, the communication unit is wirelessly connected with the communication module of the master station.

The sensor-type high-voltage electric energy meter installed on the total circuit point, each branch point, each associated load point and each single-phase end point of the distribution network adopts time synchronization technology to collect power consumption, and utilizes the public network /Ad hoc network constitutes a power data cloud system, and the collected data is calculated through the master station with centralized collection and analysis functions, and controlled and displayed through the operation terminal.

The preferred options are:

The communication unit of the sensor-type high-voltage electric energy meter includes a wireless transmitting and receiving module and an RS485 communication chip, and the connection of the RS485 communication chip includes one or more of optical fiber, GPRS, wireless transparent transmission and carrier combination. On the basis of the original sensor-type high-voltage electric energy meter, a variety of transmission functions are further added to improve network adaptability.

The source-taking circuit is a high-voltage source-taking circuit.

The source circuit includes a solar panel and a storage battery, the solar panel is connected to the storage battery, and the output end of the storage battery is connected to the voltage stabilizing unit. From the use of solar panels to generate electricity, reduce the cost of power supply for the device.

The signal acquisition mainly adopts the sensor-type high-voltage electric energy meter, that is, the sensor-type high-voltage electric energy meter. The measurement method includes sampling the voltage by the current method, collecting the voltage signal u proportional to the voltage U on the high-voltage side, and inputting the electric energy measurement unit after processing ; The I/i penetrating current sampling method collects the current signal i which is proportional to the current I of the high voltage side, and after processing, it is input to the electric energy measurement unit; the voltage signal is obtained by the I/P power supply circuit, and after processing, it is provided to the electric energy measurement unit. Power supply Vcc is required; the power metering unit performs power metering on the input voltage signal u and current signal i. The I/i penetrating current sampling method is to make one or two or more penetrating miniature current sensors into a single-cassette or through-core winding that can bear the measured current, and the output of the secondary winding is adapted to the microcomputer type. , Measurement or metering required mA level or μA level standard micro-current signal. Due to the use of the current method to measure high-voltage voltage, many problems such as electromagnetic resonance, high-order harmonics, and operating overvoltage in the electromagnetic transformer are solved, which completely meet the requirements of metering, measurement, monitoring and protection; Iron-free Strong magnetic resonance and impact resistance; avoiding the influence of the distributed capacitance on the ground by the ordinary voltage sensor using the partial pressure measurement method, the measurement error deviation is different in power systems with different topological structures, and cannot be well adapted to The problem of the power system in the form of various wiring schemes; it can adapt to the needs of power grid automation, and can provide voltage signals that meet the various needs of metering, measurement, monitoring or protection systems at the same time, making its measurement simple; the power supply method is simple, reliable and energy-saving. The sampling method not only saves energy, saves installation space, saves production materials, but also greatly reduces the cost of measurement, is environmentally friendly, and is convenient for the installation, use and maintenance of measurement, measurement or protection devices, which plays a key role in improving the quality of power supply; the safe operation coefficient is high : A single-turn overcurrent saturation will not burn, and there will be no overcurrent phenomenon during overvoltage. The voltage transformer has no magnetic saturation phenomenon; the input unit of the electric energy meter has no manganin shunt resistor, which completely solves the problem of burning the end of the meter. Therefore, the signal acquisition of the utility model can be adapted to various working conditions, has less investment and construction, less error and less energy consumption.

The beneficial effect of the utility model based on the line loss measurement and positioning system of the high-voltage electric energy meter is: the reasonable layout uses the sensor-type high-voltage electric energy meter to form the beneficial effect brought by itself, through the overall optimization design and processing, the use of the The system can realize:

1. By measuring and locating the line loss in the 6kV-35kV line, directly read the electric energy and calculate the output without calculating the replacement resistance value, avoiding wrong data caused by the transformation ratio of the transformer, and accurately grasping the line loss of the distribution line in real time The situation and its changes, the sensor-type high-voltage electric energy meter can uniquely determine the error and its precision is high, and can truly realize the scientific determination of the line loss index;

2. It has strong adaptability, can meet the working conditions of all distribution networks, has a wide range of applications, can eliminate abnormal fault points, can greatly improve the level of line loss management, reduce management line loss, reduce power leakage and measurement errors, and provide Loss reduction measures provide direction;

3. Less investment in construction and less energy consumption, which improves the economic benefits of power supply enterprises.

Description of drawings

Fig. 1 is the electrical schematic diagram of the present invention;

Fig. 2 is the electrical principle block diagram of sensor type high-voltage electric energy meter of the present invention;

Fig. 3 is a block diagram of the operation flow of the present invention;

Detailed ways

Embodiments of the utility model are further described below in conjunction with the accompanying drawings:

Example 1:

As shown in Figures 1-3, the master station, the operating terminal and the sensor-type high-voltage electric energy meter form a power data cloud system through the public network/ad hoc network; the master station is equipped with a communication module, a data acquisition unit and a server, software system, and The management platform composed of machines, the output end of the communication module is connected to the input end of the data acquisition unit, and the output end of the data acquisition unit is connected to the server; at the total loop point, each branch point, and each associated The load point and the sensor-type high-voltage electric energy meter set on each single-phase end point, the sensor-type high-voltage electric energy meter at least includes an electrically connected high-voltage voltage sampling circuit, high-voltage current sampling circuit, source circuit, voltage stabilization unit, data processing and measurement unit, a display unit, a communication unit and a clock, and the communication unit is wirelessly connected with the communication module of the master station. Multiple operators at the operating end may be connected to the management platform via wireless/wired connections, and log in to the platform through a web browser to perform operations. Manage Platform Settings for general platform management.

The communication between the sensor-type high-voltage electric energy meter and the main station can be wireless, or connected by data line or optical cable.

The high-voltage voltage sampling loop is a V/I/v voltage sampling loop set on the high-voltage load wire, the output end of the V/I/v voltage sampling loop is connected to the input end of the data processing measurement unit, and the output end of the data processing measurement unit is connected to the display unit , the high-voltage current sampling loop is to set the I/i current sampling loop on the high-voltage load wire, the output end of the I/i current sampling loop is connected to the input end of the data processing measurement unit, and the high-voltage load wire is provided with a source loop, a rectifier circuit, a storage The power supply device composed of energy unit and voltage stabilizing unit, the source circuit is that the output end of the I/P source circuit is connected to the input end of the rectifier circuit, the output end of the rectifier circuit is connected to the input end of the energy storage element and the voltage stabilizing unit, and the voltage stabilizing The output terminal of the unit is connected to the power supply terminal of the electric energy measurement unit.

The first level is equipped with sensor-type high-voltage electric energy meters (M0), the second level is equipped with n sensor-type high-voltage electric energy meters (M1-Mn), and each second-level sensor-type high-voltage electric energy meter 1 is set with n third-pole sensor-type High-voltage electric energy meters (M11-M1n) until sensor-type high-voltage electric energy meters (Mnn) are installed, and so on. The end of n-level is three-phase single-phase low-voltage subscriber line. surface.

The communication unit of the sensor-type high-voltage electric energy meter includes a wireless transmitting and receiving module and an RS485 communication chip, and the RS485 communication chip setting connection includes one or more of optical fiber, GPRS, wireless transparent transmission and carrier combination.

The source circuit is a high-voltage source circuit and may also include a solar panel and a storage battery, the solar panel is connected to the storage battery, and the output end of the storage battery is connected to the voltage stabilizing unit.

The actual line loss measurement and positioning method is: a topological structure distribution network formed by connecting high-voltage transmission lines and branch lines. The distribution network is an n-level structure. , each associated load point and the sensor-type high-voltage electric energy meter set on each single-phase end point, use time synchronization technology to collect electricity consumption, use the public network/ad hoc network to form a power data cloud system, and collect the collected data Computing through the master station with centralized acquisition and analysis functions, and controlling and displaying through the operation terminal, including the following specific steps:

Step 1: Set sensor-type high-voltage electric energy meters at the total return point, each branch point, each associated load point, and each single-phase end point of the distribution network. The sensor-type high-voltage electric energy meter includes at least electrical connections The high-voltage voltage sampling loop, high-voltage current sampling loop, source loop, voltage stabilizing unit, data processing measurement unit, display unit, communication unit and clock directly collect the total loop point, each branch point, and each The associated load point and the voltage and current of each single-phase terminal point, calculate the electric energy data, and connect the main station through the communication unit;

Step 2: Between the sensor-type high-voltage electric energy meter, the master station and the operation terminal, use the public network/ad hoc network to form a power data cloud system, and set up a communication protocol;

Step 3: The master station receives the electric energy data of the total circuit point, each branch point, each associated load point and each single-phase end point, locates the abnormal loss point, and eliminates it;

Step 4: The main station calculates the line loss from the total loop point of the high-voltage transmission line to the nth level branch line online, calculates the line loss rate, and performs output control at the request of the operator.

For example, calculate the second-level line loss = M0-(M1+M2...+Mn). So on and so forth.

The method of locating the abnormal loss point in step 3 can be a common existing technology, or use the electric energy data on each level of branch lines to calculate the line loss rate between adjacent two levels, and the line loss rate exceeds a reasonable normal value Range, that is, it is determined that there is an abnormal loss point, and the line loss rate of the branch line of this level and the branch line of the next level is calculated in turn, and the branch lines of each level are searched until the single-phase end point of the single-phase low-voltage subscriber line of the last level, Determine the branch line where the abnormal loss point is located, check and eliminate the abnormal loss point. Due to the characteristics of the sensor-type high-voltage electric energy meter itself, it can collect low-voltage single-phase electric energy. The abnormal loss point can be grounding, breakdown fault point, or electricity theft. The abnormal loss point is found by calculation and comparison method, which is convenient and quick, accurate in position, fast in speed and low in cost.

The sensor-type high-voltage electric energy meter actively uploads the electric energy data with time tags to the electric quantity data cloud system for operation. The sensor-type high-voltage electric energy meter can be set to collect signals, measure and obtain electric energy data with time tags, and then directly upload the electric energy data to the cloud system for cloud storage, cloud processing, cloud transmission, or display through the master station/operation terminal, etc.

The sensor-type high-voltage electric energy meter can also directly store electric energy data with a time tag. When performing line loss measurement or positioning operations, the operator sends a control command from the operation terminal, and then reads the data from the memory of the sensor-type high-voltage electric energy meter and uploads it. The power data cloud system is operated.

The server framework and software system functions of the master station mentioned in the utility model can be set by a program, and are mastered by professionals such as ordinary computers and electrical engineers.

Claims (4)

1. line loss actual measurement and the navigation system based on high-voltage electric energy meter, is characterized in that: comprise that main website, operating side and sensor type high tension electricity energy table form the electric quantity data cloud system by public network/ad-hoc network;

Main website arranges communication module, data acquisition unit and comprises the management platform of server, the input of the output connection data collecting unit of communication module, the output connection server of data acquisition unit;

The sensor type high tension electricity energy table arranged on the total loop point of topological structure power distribution network, each shunting point, load point that each is associated and each single-phase distal point, the sensor type high tension electricity energy table at least comprise electrical connection high tension voltage sampling loop, high-tension current sampling loop, get resource loop, voltage regulation unit, data and process metering units, display unit, communication unit and clock, the communication module wireless connections of communication unit and main website.

2. the line loss based on high-voltage electric energy meter according to claim 1 is surveyed and navigation system, it is characterized in that: the communication unit of described sensor type high tension electricity energy table comprises wireless transmission receiver module and RS485 communication chip, and the RS485 communication chip arranges to connect and comprises one or more in optical fiber, GPRS, wireless transparent transmission and carrier combination.

3. the line loss based on high-voltage electric energy meter according to claim 1 is surveyed and navigation system, and it is characterized in that: the described resource loop of getting is the high-pressure source removing circuit.

4. the line loss based on high-voltage electric energy meter according to claim 1 is surveyed and navigation system, and it is characterized in that: the described resource loop of getting comprises solar panel and storage battery, and solar panel connects storage battery, and the output of storage battery connects voltage regulation unit.

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