RU2490767C2 - Method for matching of three-wire power line with electrical load - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: matching of three-wire power line with electrical load is reached in result of fulfilment of certain conditions involving comparison of actual and reference load resistance, voltage in the line end and currents supplied to the load. Initial data on voltage and current in the line can be obtained through interfaces or sensors made in a form of voltage or current transformers or in a form of voltage dividers and alternating-current shunts. In result of initial data processing the processor shapes control signals for correcting elements and devices for voltage regulating under load in line transformers or automated process systems can be used as such correcting elements.

EFFECT: reducing losses of electric energy, reducing distortions of voltage and current curves.

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Description

The invention relates to electrical engineering and can be used in the design, installation, commissioning and operation of power lines (power lines) when transmitting electrical energy to the consumer.

The transmission of electric energy through extended power lines, as well as electric energy of increased frequency compared to non-extended power lines is ensured by: single-and two-wire power lines with one pair of electromagnetic field waves (incident and reflected); in three-wire - in three pairs; four-wire - four, etc. [one]. As a result of matching the power lines with the electric load, the throughput of the power lines increases due to the exclusion of the reflected wave. In addition, the degree of distortion of the voltage and current curves decreases, the reliability of the operation of electrical equipment increases, the operation of relay protection, automation and communication is normalized, and the environmental situation in the area of operation of power lines is improved.

The condition of the coordinated mode of operation of a single-wire power transmission line [2] is known, on the basis of which the device [patent RU 2390924] operates, where a coordinated mode of operation of a single-wire extended power line is implemented. However, a three-wire power transmission line cannot be matched only by the condition of a coordinated mode [2] due to the specificity of the propagation of voltages and currents along three-wire power lines [3].

Known methods for matching communication lines with the load [4]. However, the technical elements used here, such as a differential amplifier, are not designed to operate at high voltage, for example, 1 kV, which means that the specifics of the implementation of the methods [4] are quite peculiar and not applicable in long high voltage power lines.

The objective of the invention is the formation of a method for matching a three-wire power transmission line with an electrical load.

The technical result consists in providing the conditions for matching a three-wire high-voltage power line with an electric load, the implementation of which will entail a reduction in electric energy losses, an increase in the transmission capacity of the line, and a decrease in the degree of distortion of voltage and current curves.

The technical result is achieved by the fact that the method of matching a three-wire power line with an electrical load, which consists in the fact that the initial information about the voltages and currents in the line through the interface devices is supplied to the processor, according to the invention, the conditions for matching a three-wire power line with an electric load for each are checked in the processor line wires as a result of comparing the actual and reference values of load resistances, voltages at the end of the line or currents, guides to the load and generates control signals for the correcting bodies, as which may be used OLTC power transformers or automated processing systems.

The essence of the invention is illustrated by the diagrams: on (Fig. 1), an algorithm for ensuring and maintaining coordination of a three-wire uninsulated power transmission line with an electrical load is shown, on (Fig. 2) is a diagram of the algorithm of the processor, on (Fig. 3) in block A, logical operations are performed.

The figures show:

1 - corrective body, such as on-load tap-changer transformer (KO1);

2 - a transformer supplying power lines with voltage of 110 kV or higher (T1);

;3 - interface devices, such as voltage and current sensors, spectrum analyzers installed at the beginning of power lines with voltage of 110 kV or higher $$\left({\displaystyle \sum _{i=\mathrm{one}}^{n}D\mathrm{one}}\right)$$

;

4 - analog-to-digital Converter (ADC);

5 - processor (P);

6 - digital-to-analog converter (DAC);

7 - showing or recording device (RO);

8 - power lines with voltage of 110 kV or higher (power lines of 110 kV OR ABOVE);

9 - step-down transformer, voltage 220 kV / 10 kV (T2);

;10 - interface devices, such as voltage and current sensors, spectrum analyzers installed at the end of power lines with voltage of 110 kV or higher $$\left({\displaystyle \sum _{i=\mathrm{one}}^{n}D2}\right)$$

;

11 - step-down transformer, voltage 10 kV / 0.85 kV (T3);

12 - corrective body, such as on-load tap-changer of a step-down transformer with voltage of 220 kV / 10 kV (KO2);

13 - Converter, made in the form of a rectifier installation for electrolysis baths of an aluminum plant, phase A, (VD1);

14 - corrective body, such as on-load tap-changer of a step-down transformer with a voltage of 10 kV / 0.85 kV (KO3);

;15 - generalized electrical load $$({\underset{\_}{Z}}_{N\mathrm{BUT}GR.})$$

;

16 - a corrective organ, such as a TROLL (KO4) aluminum electrolysis system;

;17 - generalized load resistance $$\left({\underset{\_}{Z}}_{N.\mathrm{BUT}}=\frac{{\dot{U}}_{N.\mathrm{BUT}}}{\dot{I}{2}_{.A}}\right)$$

;

;18 - generalized load resistance, taking into account the implementation of matching power lines with voltage of 110 kV or higher 8 (power lines of 110 kV OR ABOVE), $$\left({\underset{\_}{Z}}_{\mathrm{AT}\mathrm{ABOUT}LN.\mathrm{BUT}}=\frac{{\dot{U}}_{\mathrm{AT}\mathrm{ABOUT}LN.\mathrm{BUT}}}{\dot{I}{2}_{N.A}}\right)$$

;

;19 - amplitude values of the load voltage $$({\dot{U}}_{N.\mathrm{BUT}})$$

;

;20 - amplitude values of the load current $$(\dot{I}{2}_{.\mathrm{BUT}})$$

;

21 is a specialized program for predicting the magnitude of the main characteristics of electric energy in a three-wire power transmission line (LEP3 v.1.00);

;22 - the magnitude of the currents, which should be characterized by electric energy transmitted through power lines, consistent with the electrical load $$(\dot{I}{2}_{N.\mathrm{BUT}})$$

;

.23 - voltage values, which should be characterized by electric energy transmitted through power lines, consistent with the electrical load $$({\dot{U}}_{\mathrm{AT}\mathrm{ABOUT}LN.\mathrm{BUT}})$$

.

24 - logical block (A).

The essence of the proposed development is to implement, using technical means, the conditions for matching a three-wire high-voltage power line with an electric load [5-7], in the formation of an algorithm to ensure and maintain a consistent operating mode for an extended three-wire power line. In case of violation of the symmetry of the electric power system, which includes the considered power line, the conditions for its coordination with the electric load should be determined for each wire of the power transmission line.

Let it be necessary to match phase A with the electrical load. For phases B and C, the matching algorithm with the electrical load will be similar.

. Блоки 9 (Т2), 11 (Т3), 13 (VD1) и 15 $$({\underset{\_}{Z}}_{НАГР.})$$

образуют общий блок, полное сопротивление которого при достижении согласованного режима работы ЛЭП 8 (ЛЭП 110 кВ ИЛИ ВЫШЕ) определяется величиной 18 $$\left({\underset{\_}{Z}}_{ВОЛН.А}=\frac{{\dot{U}}_{ВОЛН.А}}{\dot{I}{2}_{Н.A}}\right)$$

, а в иных случаях - 17 $$\left({\underset{\_}{Z}}_{Н.А}=\frac{{\dot{U}}_{Н.А}}{\dot{I}{2}_{.A}}\right)$$

. В данном случае полное сопротивление 18 $$\left({\underset{\_}{Z}}_{ВОЛН.А}=\frac{{\dot{U}}_{ВОЛН.А}}{\dot{I}{2}_{Н.A}}\right)$$

является эталонной величиной, к которой должно стремиться значение 17 $$\left({\underset{\_}{Z}}_{Н.А}=\frac{{\dot{U}}_{Н.А}}{\dot{I}{2}_{.A}}\right)$$

в процессе исполнения предлагаемого алгоритма.Fig. 1 shows an algorithm for ensuring and maintaining coordination of a three-wire uninsulated power transmission line with an electrical load. Here, as the object of approval, a power line with a voltage of 110 kV or more than 8 (power line of 110 kV OR ABOVE) was used. In addition, the use of the following electrical equipment was implemented: transformer 2 (T1) - a transformer supplying power lines with a voltage of 110 kV or higher 8 (power lines 110 kV OR ABOVE); transformers 9 (T2) and 11 (T3) - two different groups of step-down transformers having different nominal characteristics; Converter 13 (VD1) - a converter made in the form of a rectifier for electrolysis baths of an aluminum smelter, phase A, which in this case represents a generalized electrical load 15 $$({\underset{\_}{Z}}_{N\mathrm{BUT}GR.})$$

. Blocks 9 (T2), 11 (T3), 13 (VD1) and 15 $$({\underset{\_}{Z}}_{N\mathrm{BUT}GR.})$$

form a common block, the total resistance of which when reaching the agreed mode of operation of power lines 8 (power lines 110 kV OR ABOVE) is determined by the value 18 $$\left({\underset{\_}{Z}}_{\mathrm{AT}\mathrm{ABOUT}LN.\mathrm{BUT}}=\frac{{\dot{U}}_{\mathrm{AT}\mathrm{ABOUT}LN.\mathrm{BUT}}}{\dot{I}{2}_{N.A}}\right)$$

, and in other cases - 17 $$\left({\underset{\_}{Z}}_{N.\mathrm{BUT}}=\frac{{\dot{U}}_{N.\mathrm{BUT}}}{\dot{I}{2}_{.A}}\right)$$

. In this case, the impedance is 18 $$\left({\underset{\_}{Z}}_{\mathrm{AT}\mathrm{ABOUT}LN.\mathrm{BUT}}=\frac{{\dot{U}}_{\mathrm{AT}\mathrm{ABOUT}LN.\mathrm{BUT}}}{\dot{I}{2}_{N.A}}\right)$$

is the reference value that value 17 should aim for $$\left({\underset{\_}{Z}}_{N.\mathrm{BUT}}=\frac{{\dot{U}}_{N.\mathrm{BUT}}}{\dot{I}{2}_{.A}}\right)$$

in the process of executing the proposed algorithm.

или 18 $$\left({\underset{\_}{Z}}_{ВОЛН.А}=\frac{{\dot{U}}_{ВОЛН.А}}{\dot{I}{2}_{Н.A}}\right)$$

. Эти сведения в процессор поступают от устройств сопряжения, каковыми являются датчики тока и напряжения 3 $$\left({\displaystyle \sum _{i=1}^nД1}\right)$$

и 10 $$\left({\displaystyle \sum _{i=1}^nД2}\right)$$

, где анализируемые характеристики электрической энергии доводятся до величин, воспринимаемых компьютерной техникой. Датчики 3 $$\left({\displaystyle \sum _{i=1}^nД1}\right)$$

устанавливаются и используются для сбора сведений о напряжениях и токах в начале исследуемой протяженной трехпроводной ЛЭП 8 (ЛЭП 110 кВ ИЛИ ВЫШЕ), а датчики 10 $$\left({\displaystyle \sum _{i=1}^nД2}\right)$$

- в конце этой линии электропередачи 8 (ЛЭП 110 кВ ИЛИ ВЫШЕ). В качестве датчиков 3 $$\left({\displaystyle \sum _{i=1}^nД1}\right)$$

и 10 $$\left({\displaystyle \sum _{i=1}^nД2}\right)$$

могут быть использованы трансформаторы напряжения и тока, спектроанализаторы, а также делители напряжения и шунты переменного тока.The main unit of the algorithm of the method for matching a three-wire power line 8 (power line 110 kV OR higher) with an electrical load is processor 5 (P) (Fig. 1), where the analysis of information about the state of the generalized load resistance 17 $$\left({\underset{\_}{Z}}_{N.\mathrm{BUT}}=\frac{{\dot{U}}_{N.\mathrm{BUT}}}{\dot{I}{2}_{.A}}\right)$$

or 18 $$\left({\underset{\_}{Z}}_{\mathrm{AT}\mathrm{ABOUT}LN.\mathrm{BUT}}=\frac{{\dot{U}}_{\mathrm{AT}\mathrm{ABOUT}LN.\mathrm{BUT}}}{\dot{I}{2}_{N.A}}\right)$$

. This information is supplied to the processor from the interface devices, which are current and voltage sensors 3 $$\left({\displaystyle \sum _{i=\mathrm{one}}^{n}D\mathrm{one}}\right)$$

and 10 $$\left({\displaystyle \sum _{i=\mathrm{one}}^{n}D2}\right)$$

where the analyzed characteristics of electrical energy are brought to the values perceived by computer technology. Sensors 3 $$\left({\displaystyle \sum _{i=\mathrm{one}}^{n}D\mathrm{one}}\right)$$

are installed and used to collect information about voltages and currents at the beginning of the studied extended three-wire power lines 8 (110 kV power lines OR ABOVE), and the sensors 10 $$\left({\displaystyle \sum _{i=\mathrm{one}}^{n}D2}\right)$$

- at the end of this power line 8 (110 kV power transmission line OR ABOVE). As sensors 3 $$\left({\displaystyle \sum _{i=\mathrm{one}}^{n}D\mathrm{one}}\right)$$

and 10 $$\left({\displaystyle \sum _{i=\mathrm{one}}^{n}D2}\right)$$

voltage and current transformers, spectrum analyzers, as well as voltage dividers and AC shunts can be used.

и 10 $$\left({\displaystyle \sum _{i=1}^nД2}\right)$$

аналоговые сигналы преобразовать в дискретные. Цифроаналоговый преобразователь 6 (ЦАП) позволяет сформированные в виде дискретных сигналов в процессоре 5 (П) команды корректирующим органам 1 (КО1), 12 (КО2), 14 (КО3) и 16 (КО4) преобразовать в аналоговые. В данном случае в качестве корректирующих органов 1 (КО1), 12 (КО2) и 14 (КО3) использованы устройства РПН силовых трансформаторов, а в качестве корректирующего органа 16 (КО4) - система электролиза алюминия ТРОЛЛЬ [8, 9], позволяющая изменять величину полного сопротивления обобщенной нагрузки 17 $$\left({\underset{\_}{Z}}_{Н.А}=\frac{{\dot{U}}_{Н.А}}{\dot{I}{2}_{.A}}\right)$$

путем воздействия на технологический процесс. На (рис.1) это сопротивление обозначено символом 15 $$\left({\underset{\_}{Z}}_{нагр.}\right)$$

. Результаты действия описываемого алгоритма выводятся на показывающий или самопишущий прибор 7 (РО).Analog-to-digital converter 4 (ADC) (Fig. 1) allows formed in sensors 3 $$\left({\displaystyle \sum _{i=\mathrm{one}}^{n}D\mathrm{one}}\right)$$

and 10 $$\left({\displaystyle \sum _{i=\mathrm{one}}^{n}D2}\right)$$

convert analog signals to discrete. The digital-to-analog converter 6 (DAC) allows the corrective bodies 1 (KO1), 12 (KO2), 14 (KO3) and 16 (KO4) generated in the form of discrete signals in the processor 5 (P) to convert to analog. In this case, the on-load tap-changer devices of power transformers were used as corrective organs 1 (KO1), 12 (KO2) and 14 (KO3), and the TROLL aluminum electrolysis system as corrective organ 16 (KO4) [8, 9], which allows changing the value impedance of the generalized load 17 $$\left({\underset{\_}{Z}}_{N.\mathrm{BUT}}=\frac{{\dot{U}}_{N.\mathrm{BUT}}}{\dot{I}{2}_{.A}}\right)$$

by influencing the process. In (Fig. 1) this resistance is indicated by the symbol 15 $$\left({\underset{\_}{Z}}_{n\mathrm{but}gR.}\right)$$

. The results of the described algorithm are displayed on a indicating or recording device 7 (PO).

и напряжения 19 $$({\dot{U}}_{Н.А})$$

нагрузки, затем определяется величина 17 $$\left({\underset{\_}{Z}}_{Н.А}=\frac{{\dot{U}}_{Н.А}}{\dot{I}{2}_{.A}}\right)$$

. Определенные таким образом величины 20 $$(\dot{I}{2}_{А}),$$

19 $$({\dot{U}}_{Н.А})$$

, 17 $$\left({\underset{\_}{Z}}_{Н.А}=\frac{{\dot{U}}_{Н.А}}{\dot{I}{2}_{.A}}\right)$$

подаются в следующий блок 24 (А).The algorithm diagram of the processor 5 (P) is presented in (Fig. 2). It is quite simple: from 4 (ADC) to the processor 5 (P), the amplitude values of the current 20 $$(\dot{I}{2}_{\mathrm{BUT}})$$

and voltage 19 $$({\dot{U}}_{N.\mathrm{BUT}})$$

load, then a value of 17 is determined $$\left({\underset{\_}{Z}}_{N.\mathrm{BUT}}=\frac{{\dot{U}}_{N.\mathrm{BUT}}}{\dot{I}{2}_{.A}}\right)$$

. The quantities thus determined are 20 $$(\dot{I}{2}_{\mathrm{BUT}}),$$

19 $$({\dot{U}}_{N.\mathrm{BUT}})$$

, 17 $$\left({\underset{\_}{Z}}_{N.\mathrm{BUT}}=\frac{{\dot{U}}_{N.\mathrm{BUT}}}{\dot{I}{2}_{.A}}\right)$$

served in the next block 24 (A).

и 23 $$({\dot{U}}_{ВОЛН.А})$$

формируются величины токов и напряжений в конце линии, какими должна характеризоваться электрическая энергия, передаваемая по ЛЭП 8 (ЛЭП 110 кВ ИЛИ ВЫШЕ), согласованной с электрической нагрузкой. Эти токи и напряжения определяются следующим образом [5-7]:Block 21 (LEP3 v.1.00) in (Fig. 2) illustrates the use in the proposed method of matching a three-wire power transmission line with an electric load of a specialized program for predicting the magnitude of the main characteristics of electric energy in a three-wire power transmission line [10]. Using the program, the effective values of the complex values of currents and voltages, the propagation constants of the waves of the electromagnetic field along the wires of the power transmission line, and the values of the intrinsic and mutual wave resistances are determined. In blocks 22 $$(\dot{I}{2}_{N.\mathrm{BUT}})$$

and 23 $$({\dot{U}}_{\mathrm{AT}\mathrm{ABOUT}LN.\mathrm{BUT}})$$

the values of currents and voltages are formed at the end of the line, which should characterize the electric energy transmitted through power lines 8 (power lines 110 kV OR ABOVE), consistent with the electrical load. These currents and voltages are determined as follows [5-7]:

$$\dot{I}{2}_{H.A}={\dot{I}}_{\mathrm{one}An}\cdot e^{-{\gamma }_{\mathrm{one}n}l};$$

$$\dot{I}{2}_{H.B}={\dot{I}}_{\mathrm{one}Bn}\cdot e^{-{\gamma }_{\mathrm{one}n}l};$$

$$\dot{I}{2}_{H.C}={\dot{I}}_{\mathrm{one}Cn}\cdot e^{-{\gamma }_{\mathrm{one}n}l};$$

$${\dot{U}}_{\mathrm{AT}\mathrm{ABOUT}LN.\mathrm{BUT}}={\dot{U}}_{\mathrm{one}An}\cdot e^{-{\gamma }_{\mathrm{one}n}l};$$

$${\dot{U}}_{\mathrm{AT}\mathrm{ABOUT}LN.B}={\dot{U}}_{\mathrm{one}Bn}\cdot e^{-{\gamma }_{\mathrm{one}n}l};$$

$${\dot{U}}_{\mathrm{AT}\mathrm{ABOUT}LN.C}={\dot{U}}_{\mathrm{one}Cn}\cdot e^{-{\gamma }_{\mathrm{one}n}l},$$

, $${\dot{U}}_{1B\text{}n}$$

, $${\dot{U}}_{1Cn}$$

- комплексные значения действующих величин фазных напряжений в начале ЛЭП, В; γ_1n - постоянная распространения одной из пар волн электромагнитного поля по проводам ЛЭП; l - протяженность рассматриваемой трехпроводной ЛЭП, км; $${\dot{I}}_{1An}$$

, $${\dot{I}}_{1Bn}$$

, $${\dot{I}}_{1Cn}$$

- комплексные значения действующих величин линейных токов в начале ЛЭП, А.Where $${\dot{U}}_{\mathrm{one}An}$$

, $${\dot{U}}_{\mathrm{one}B\text{A.}n}$$

, $${\dot{U}}_{\mathrm{one}Cn}$$

- complex values ​​of the current values ​​of phase voltages at the beginning of power lines, V; γ _1n is the propagation constant of one of the pairs of waves of the electromagnetic field along the wires of the power lines; l is the length of the considered three-wire power transmission line, km; $${\dot{I}}_{\mathrm{one}An}$$

, $${\dot{I}}_{\mathrm{one}Bn}$$

, $${\dot{I}}_{\mathrm{one}Cn}$$

- complex values ​​of the effective values ​​of linear currents at the beginning of power lines, A.

, какое оно должно быть при согласовании трехпроводной ЛЭП с этой нагрузкой. Полученные результаты отправляются в блок 24 (А).Next, the load impedance 18 is determined $$\left({\underset{\_}{Z}}_{\mathrm{AT}\mathrm{ABOUT}LN.\mathrm{BUT}}=\frac{{\dot{U}}_{\mathrm{AT}\mathrm{ABOUT}LN.\mathrm{BUT}}}{\dot{I}{2}_{N.A}}\right)$$

what it should be when matching a three-wire power line with this load. The results are sent to block 24 (A).

, 23 $$({\dot{U}}_{ВОЛН.А})$$

с сопротивлением нагрузки 17 $$\left({\underset{\_}{Z}}_{Н.А}=\frac{{\dot{U}}_{Н.А}}{\dot{I}{2}_{.A}}\right)$$

и напряжением в конце линии 19 $$({\dot{U}}_{Н.А})$$

. Здесь же из сопоставления этих величин определяются ошибки по сопротивлению ΔZ1, ΔZ2, ΔZ3 и по напряжению ΔU1, ΔU2, ΔU3. Затем определяются ошибки по току ΔI01-05, ΔI07, ΔI08. При нулевых значениях ошибок по напряжению, ошибки по току ΔI06 и ΔI09 отсутствуют, поэтому в их определении нет необходимости. Информация о величинах ΔZ1, ΔZ2, ΔZ3 и ΔU1, ΔU2, ΔU3 поступает в один из девяти блоков с приоритетом 2. Последующее действие описываемого алгоритма заключается в определении ошибок либо по сопротивлению ΔZ04p, ΔZ06p, ΔZ07p, ΔZ08p, ΔZ09p, либо по напряжению ΔU01p, ΔU02p, ΔU03Kp, ΔU05p. Полученные таким образом значения ошибок по напряжению поступают в блок суммы ошибок по напряжению $${\displaystyle \sum _{i=1}^5{U}_A}$$

, а величины ошибок по сопротивлению попадают в блок суммы ошибок по сопротивлению $${\displaystyle \sum _{i=1}^5{Z}_A}$$

. Сведения о результатах расчета ошибок поступают в один или несколько блоков корректирующих органов 1, 12, 14, 16 (КО1-4) (рис.1).In block 24 (A) (Fig. 3), logical operations are performed. Reference values are compared here. 18 $$\left({\underset{\_}{Z}}_{\mathrm{AT}\mathrm{ABOUT}LN.\mathrm{BUT}}=\frac{{\dot{U}}_{\mathrm{AT}\mathrm{ABOUT}LN.\mathrm{BUT}}}{\dot{I}{2}_{N.A}}\right)$$

, 23 $$({\dot{U}}_{\mathrm{AT}\mathrm{ABOUT}LN.\mathrm{BUT}})$$

with load resistance 17 $$\left({\underset{\_}{Z}}_{N.\mathrm{BUT}}=\frac{{\dot{U}}_{N.\mathrm{BUT}}}{\dot{I}{2}_{.A}}\right)$$

and voltage at the end of line 19 $$({\dot{U}}_{N.\mathrm{BUT}})$$

. Here, from a comparison of these values, errors are determined by the resistance ΔZ1, ΔZ2, ΔZ3 and by the voltage ΔU1, ΔU2, ΔU3. Then, the current errors ΔI01-05, ΔI07, ΔI08 are determined. At zero values of voltage errors, there are no current errors ΔI06 and ΔI09, therefore, their determination is not necessary. Information on the quantities ΔZ1, ΔZ2, ΔZ3 and ΔU1, ΔU2, ΔU3 is received in one of nine blocks with priority 2. The subsequent action of the described algorithm consists in determining errors either by resistance ΔZ04p, ΔZ06p, ΔZ07p, ΔZ08p, ΔZ09p, or voltage ΔZ09p ΔU02p, ΔU03Kp, ΔU05p. The voltage error values obtained in this way go to the voltage error sum block $${\displaystyle \sum _{i=\mathrm{one}}^5{U}_A}$$

, and the values of errors in resistance fall into the block of the sum of errors in resistance $${\displaystyle \sum _{i=\mathrm{one}}^5{Z}_A}$$

. Information about the results of the calculation of errors is received in one or more blocks of corrective bodies 1, 12, 14, 16 (KO1-4) (Fig. 1).

следует собирать ошибки по току, а затем в результате сопоставления эталонного и действительного значений токов в конце линии сформировать сигнал для корректирующих органов 1, 12, 14, 16 (КО1-4) (рис.1).Here, as a criterion for the functioning of corrective organs, a mismatch of voltage at the end of the line or load resistance is selected. In principle, the current mismatch at the end of the line can also be chosen as such a criterion. For this, in the block $${\displaystyle \sum _{i=\mathrm{one}}^5{Z}_A}$$

current errors should be collected, and then, as a result of comparing the reference and actual current values at the end of the line, generate a signal for corrective organs 1, 12, 14, 16 (KO1-4) (Fig. 1).

и $$17\left({\underset{\_}{Z}}_{Н.А}=\frac{{\dot{U}}_{Н.А}}{\dot{I}{2}_{.А}}\right)>18\left({\underset{\_}{Z}}_{ВОЛН.А}=\frac{{\dot{U}}_{ВОЛН.А}}{\dot{I}{2}_{Н.А}}\right)$$

ошибка по току не определяется. В этом случае предусмотрено определение дополнительной ошибки по напряжению ΔU_O в виде произведения разницы между 23 $$({\dot{U}}_{ВОЛН.А})$$

и 19 $$({\dot{U}}_{Н.А})$$

и коэффициента состояния ΔIos1. Затем сведения об этой дополнительной ошибке отправляются в блок $${\displaystyle \sum _{i=1}^5{U}_A}$$

.In the process of implementing the proposed method of matching a three-wire power transmission line with an electrical load, it was found that with $$19({\dot{U}}_{N.\mathrm{BUT}})>23({\dot{U}}_{\mathrm{AT}\mathrm{ABOUT}LH.A})$$

and $$17\left({\underset{\_}{Z}}_{N.\mathrm{BUT}}=\frac{{\dot{U}}_{N.\mathrm{BUT}}}{\dot{I}{2}_{.\mathrm{BUT}}}\right)>\mathrm{eighteen}\left({\underset{\_}{Z}}_{\mathrm{AT}\mathrm{ABOUT}LN.\mathrm{BUT}}=\frac{{\dot{U}}_{\mathrm{AT}\mathrm{ABOUT}LN.\mathrm{BUT}}}{\dot{I}{2}_{N.\mathrm{BUT}}}\right)$$

current error is not detected. In this case, the definition of an additional voltage error ΔU _O is provided in the form of the product of the difference between 23 $$({\dot{U}}_{\mathrm{AT}\mathrm{ABOUT}LN.\mathrm{BUT}})$$

and 19 $$({\dot{U}}_{N.\mathrm{BUT}})$$

and the state coefficient ΔIos1. Then information about this additional error is sent to the block. $${\displaystyle \sum _{i=\mathrm{one}}^5{U}_A}$$

.

Block 24 (A) (Fig. 3) is implemented in the National Instruments LabVIEW 2009 environment.

Information sources

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Claims (1)

A method of matching a three-wire power line with an electric load, which consists in the fact that the initial information about the voltages and currents in the line through the interface devices is supplied to the processor, characterized in that the processor checks the conditions for matching a three-wire power line with an electric load for each wire of the line as a result comparing the actual and reference values of the load resistances, voltages at the end of the line or currents entering the load, and control signals for corrective organs, which can be used on-load tap-changers of power transformers or automated technological complexes.

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