RU2651610C1 - Method for revealing the places of origin and magnitude of non-technical losses of energy in electrical networks by data of synchronous measurements - Google Patents

Method for revealing the places of origin and magnitude of non-technical losses of energy in electrical networks by data of synchronous measurements Download PDF

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RU2651610C1
RU2651610C1 RU2016151348A RU2016151348A RU2651610C1 RU 2651610 C1 RU2651610 C1 RU 2651610C1 RU 2016151348 A RU2016151348 A RU 2016151348A RU 2016151348 A RU2016151348 A RU 2016151348A RU 2651610 C1 RU2651610 C1 RU 2651610C1
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non
technical
losses
network
power
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RU2016151348A
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Russian (ru)
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Юрий Григорьевич Кононов
Евгений Геннадьевич Зеленский
Максим Владимирович Жуков
Роман Николаевич Липский
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Акционерное Общество "Электротехнические заводы "Энергомера"
федеральное государственное автономное образовательное учреждение высшего образования "Северо-Кавказский федеральный университет"
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R11/00Electromechanical arrangements for measuring time integral of electric power, i.e. electric energy or current, e.g. of consumption
    • G01R11/02Constructional details
    • G01R11/17Compensating for errors; Adjusting or regulating means therefor
    • G01R11/19Compensating for errors caused by disturbing torque, e.g. rotating-field errors of polyphase meters

Abstract

FIELD: electrical engineering.
SUBSTANCE: invention relates to electrical engineering, namely, to automated information-measuring systems for commercial electric power metering. Method makes it possible to identify the places of origin and magnitude of non-technical energy losses in open-loop power distribution networks with voltage of 35 kV and below with an accuracy of up to a separate network site according to synchronous measurement data. Method includes evaluating the state of an electrical network based on synchronous measurements of network parameters and revealing the origin and magnitude of non-technical energy losses in electrical networks from the data of synchronous measurements of current and voltage vectors. Invention makes it possible to increase the reliability and efficiency of identifying areas of an electrical network that have an increased level of non-technical power losses. Technical result, which can be obtained by using the claimed method, is to reduce costs when operating power distribution networks of 0.4–10 kV electric power system due to the operational identification of the sources of non-technical power losses, to increase the reliability of determining the amount of non-technical losses in the network sections in an automated system of commercial metering of electric power for taking technical and organizational measures for their subsequent liquidation.
EFFECT: costs reduction in the operation of power distribution networks.
1 cl, 1 dwg

Description

The invention relates to the field of electrical engineering. The method includes assessing the state of the electric network based on synchronous measurements of the network parameters and identifying places of occurrence and values of non-technical energy losses in electric networks according to the data of synchronous measurements of current and voltage vectors. The invention improves the reliability and efficiency of identifying sections of the electric network having an increased level of non-technical energy losses.

The invention relates to the field of electrical engineering and can be used to reliably and quickly identify places of the electric network with an increased level of non-technical energy losses, which allows you to quickly take technical and organizational measures to eliminate the sources and causes of losses. The invention can be used to build automated information-measuring systems for the commercial accounting of electricity as their main or additional function.

One of the main problems of the domestic and foreign electric power complex is the high level of actual losses of electric energy in distribution electric networks, including their non-technical (commercial) component, mainly due to the neglected use and theft of electricity. As domestic and foreign experience shows, the value of the non-technical component of electricity losses is mainly present in the structure of losses in distribution networks with a voltage of 0.38-10 kV.

The issue of determining non-technical losses is one of the main issues in distribution electric networks. The function of identifying places of occurrence and values of non-technical losses is in demand in domestic and foreign power supply organizations, while it is implemented only in a small number of automated systems for commercial accounting of electricity and, as a rule, it is limited to the function of calculating unbalances of electric energy, as well as the estimated probability of theft with a low reliability based on statistical methods based on the analysis of consumption by each subscriber in the previous s intervals, which does not allow to identify foci of increased levels of non-technical losses and electricity theft place up to a particular user. At the same time, the installation of these systems as one of the main goals is to reduce non-technical energy losses.

To date, several methods are known for detecting non-technical energy losses. These include:

A method for detecting uncontrolled electricity consumption in 0.4 kV networks (RF patent for the invention No. 2251703). The essence of the method consists in sequentially disconnecting and connecting the load of consumers and installing additional devices. After disconnecting the load of all commercial consumers from the power supply line, the power consumption of the power supply line is measured, the measured value is compared with the calculated value of the power consumption of the line. With a significant discrepancy between the calculated and measured power, it is concluded that there are non-technical losses of electricity. The disadvantage of this method is the need to disconnect the load of consumers, which can lead to interruptions in power supply and increases the cost of operating the system. In addition, this method only allows to identify the fact of the presence of non-technical losses, but does not accurately localize the source of these losses.

A method for determining technological losses of electricity in an alternating current traction network (RF patent for the invention No. 2267410 of 06.22.2004). The essence of the method is the synchronous measurement of current and voltage on each feeder of the contact network of each traction substation and on electric locomotives with a frequency of 0.1 to 1 minute. According to these data, electricity costs are calculated at traction substations and at electric locomotives. Then, technological losses of electric energy in the traction network are determined as the difference between the values of electric energy consumption at traction substations and at electric locomotives. Knowing the technological losses of electricity, non-technical losses can be defined as the difference between the actual losses and the technological ones. Despite the fact that the proposed method, in contrast to the previous one, does not require periodic blackouts of consumers, it, like the previous one, only reveals the presence of non-technical losses, but does not accurately localize the source of these losses.

For the closest analogue, a method has been adopted for detecting uncontrolled electricity consumption in an electric network of 0.4 kV (RF patent for the invention No. 2265858). The method according to the specified patent consists in synchronous passive measurements of the parameters of the network mode and comparing the measured voltages and calculated values. The load of commercial consumers is connected to the power supply line through executive subscriber devices that are controlled remotely via a radio channel, can measure instantaneous voltage and current values, calculate the actual voltage values and the consumed load current for a period from the measured values, write them to memory via a radio channel transmitted from the center team, characterized in that at the same time measure the instantaneous values of voltages and load currents at all points of connection of consumers power lines, calculate from the measured values the effective values of the voltage and the consumed load current for the period, the measured values are stored in the device memory, the measured values of the voltages and currents of the loads are read, the total resistance of the loads of the consumers is calculated from the measured values, the phase voltages are calculated in all places of the load connection using the equivalent circuit of the power line, calculate the difference between the calculated and measured voltage values at each network node, identify places of uncontrolled electricity consumption by the maximum values of the difference between the calculated and measured values of phase voltages and the values of uncontrolled power consumption. In those nodes where uncontrolled load takes place, the difference between the measured and calculated voltages will be the largest.

The disadvantage of this method is that it involves the use of operating parameters (current values of currents and voltages, active power) from traditional measuring devices for distribution networks. However, at present, the level of development of electronic, information, and communication technologies has reached such a level that it has become possible to switch without a significant increase in cost to new-generation measuring systems that make it possible to perform qualitatively new measurements of operating parameters, which makes it possible to significantly modernize existing methods for identifying places of occurrence and values of non-technical losses energy in electric networks, significantly increase the accuracy of localization of places of unauthorized consumption.

The aim of the invention is to reduce the error in identifying places of occurrence and the values of non-technical energy losses in electric networks through the use of modern means of measuring current and voltage vectors.

Distinctive features of the claimed invention from the prototype are the following:

1. The use of high-precision (less than 1 ms) synchronous measurements of the operational parameters of the network is assumed.

2. Used additional operational parameters of the network, namely the phase angles of the currents and voltages of the network loads.

The technical result that can be obtained using the proposed method is to reduce costs during the operation of distribution electric networks of 0.4-10 kV of the electric power system by quickly identifying foci of non-technical energy losses, increasing the reliability of determining the magnitude of non-technical losses in network sections in an automated system commercial electricity metering for technical and organizational measures for their subsequent elimination.

The essence of the proposed method, we consider the example of a simple three-phase feeder that feeds two consumers. We assume that the feeder mode is sinusoidal and symmetrical, which allows us to consider a single-phase equivalent circuit (Fig. 1).

Suppose that a measuring device has been installed in the power center and at the consumers, which makes it possible to measure current and voltage vectors, as well as active and reactive power. Assume that there are non-technical power losses in the network, that is:

Figure 00000001

Where

Figure 00000002
- full power of the power center;

Figure 00000003
- full load power;

dS 12 - technical power loss in line 12;

dS 23 - technical power loss in line 23.

It is necessary to localize nodes with non-technical power losses and determine the actual power values.

Knowing the voltage and phase angles, as well as the resistance of the lines Z 12 and Z 23 , it is possible to calculate the complexes of currents in the lines:

Figure 00000004

and complexes of load currents:

Figure 00000005

as well as load capacity complexes:

Figure 00000006

Comparing the measured S 2meas , S 3meas and the calculated S 2calc , S 3calculation of load power, we can conclude that there are non-technical power losses in the corresponding node. If

Figure 00000007
, where ε is the permissible calculation error, then the power measurements in the node are reliable, there are no non-technical power losses. The calculation error ε depends on the accuracy of setting the passive parameters of the network elements; it can be calculated empirically or by mathematical modeling for a specific network. The claimed invention has several modifications:

1. Formulas (1) - (4) can be used for synchronous measurements of current vectors and network load voltages at given times.

2. Formulas (1) - (4) can be used for averaged measurements of current vectors and network load voltages for a certain time interval.

3. Formulas (1) - (4) can be used in phase coordinates or decomposed into symmetrical components.

4. Formulas (1) - (4) can be used only for the fundamental harmonic, or for the entire spectrum of harmonics present in the electrical network.

5. To improve accuracy, mutual induction between the phase wires of the network lines can be taken into account.

The listed modifications are accurate and depend on the technical features of the used measuring devices.

Claims (1)

  1. A method for identifying places of occurrence and values of non-technical energy losses in electric networks according to the data of synchronous measurements, which consists in the ability to determine the value of non-technical energy losses in each node of electric networks and with a high degree of efficiency and reliability to determine the places of unaccounted for electricity consumption up to an individual consumer, characterized in that an approach based on the estimation of synchronously measured current and voltage vectors, the calculation of the measured eyelids to the voltage tori in the load nodes and the current supply center in all network elements and the subsequent comparison of the calculated and measured load powers, based on which it is concluded that there are no or non-technical losses of electricity in each network node, allowing for the asymmetry of loads, repeated grounding, and mutual induction between wires phases and non-sinusoidality of both the current consumption and the voltage of the power source, is designed to reduce the cost of operating distribution electric networks.
RU2016151348A 2016-12-27 2016-12-27 Method for revealing the places of origin and magnitude of non-technical losses of energy in electrical networks by data of synchronous measurements RU2651610C1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2700289C1 (en) * 2019-01-23 2019-09-16 федеральное государственное автономное образовательное учреждение высшего образования "Северо-Кавказский федеральный университет" METHOD OF DETERMINING PLACES OF UNCONTROLLED ELECTRIC POWER CONSUMPTION IN ELECTRIC NETWORK 0,4 kV

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0627083B1 (en) * 1992-02-21 1998-04-29 ABB Power T&D Company Inc. Method and apparatus for electronic meter testing
EP0980002A1 (en) * 1998-07-13 2000-02-16 Powercom Control Systems Ltd. A device for detecting and reporting theft of electric power
RU150986U1 (en) * 2014-06-25 2015-03-10 Андрей Иванович Колбасенко Device for input and accounting of electric energy in distribution networks of low voltage with theft protection

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0627083B1 (en) * 1992-02-21 1998-04-29 ABB Power T&D Company Inc. Method and apparatus for electronic meter testing
EP0980002A1 (en) * 1998-07-13 2000-02-16 Powercom Control Systems Ltd. A device for detecting and reporting theft of electric power
RU150986U1 (en) * 2014-06-25 2015-03-10 Андрей Иванович Колбасенко Device for input and accounting of electric energy in distribution networks of low voltage with theft protection

Non-Patent Citations (1)

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Title
Статья: "АНАЛИЗ МЕТОДОВ ОБНАРУЖЕНИЯ НЕТЕХНИЧЕСКИХ ПОТЕРЬ ЭЛЕКТРОЭНЕРГИИ", Ж.: СИСТЕМНЫЙ АНАЛИЗ В НАУКЕ И ОБРАЗОВАНИИ, Номер: 4 (30), 2015. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2700289C1 (en) * 2019-01-23 2019-09-16 федеральное государственное автономное образовательное учреждение высшего образования "Северо-Кавказский федеральный университет" METHOD OF DETERMINING PLACES OF UNCONTROLLED ELECTRIC POWER CONSUMPTION IN ELECTRIC NETWORK 0,4 kV

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