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WO2018066739A1 - Réacteur shunt, système de ligne comprenant ledit réacteur, et procédé de commande dudit réacteur shunt - Google Patents

Réacteur shunt, système de ligne comprenant ledit réacteur, et procédé de commande dudit réacteur shunt Download PDF

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Publication number
WO2018066739A1
WO2018066739A1 PCT/KR2016/011268 KR2016011268W WO2018066739A1 WO 2018066739 A1 WO2018066739 A1 WO 2018066739A1 KR 2016011268 W KR2016011268 W KR 2016011268W WO 2018066739 A1 WO2018066739 A1 WO 2018066739A1
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WO
WIPO (PCT)
Prior art keywords
resistance
unit
shunt reactor
variable
breaker
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2016/011268
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English (en)
Korean (ko)
Inventor
한기선
구선근
곽주식
주형준
정문규
오승열
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Korea Electric Power Corp
Original Assignee
Korea Electric Power Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Korea Electric Power Corp filed Critical Korea Electric Power Corp
Priority to PCT/KR2016/011268 priority Critical patent/WO2018066739A1/fr
Publication of WO2018066739A1 publication Critical patent/WO2018066739A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Definitions

  • the present invention relates to a shunt reactor, a track system including the same, and a shunt reactor control method.
  • Shunt reactor is a device to compensate the reactive power of the line.
  • the shunt reactor may be provided to compensate for reactive power caused by the charging current of the long-distance transmission line, and may include a separate circuit breaker for opening and closing the shunt reactor.
  • the breaker may generate an overvoltage harmful to the system during the opening and closing operation due to the characteristics of the shunt reactor load power factor of about 90 degrees above the ground. This can cause breakers themselves to fail, as well as damage to the relays, including insulation damage to power equipment, including shunt reactors connected to the grid.
  • the present invention provides a shunt reactor for reducing the occurrence of overvoltage, a line system including the same, and a shunt reactor control method.
  • a shunt reactor includes: a variable inductance unit connected to a breaker through a line and having a variable inductance; A variable resistance unit having a variable resistance connected to the breaker through a line; And a control unit configured to receive the state change signal of the circuit breaker and control the variable inductance unit and the variable resistance unit together such that one of the inductance of the variable inductance unit and the resistance of the variable resistance unit is increased and the other is reduced based on the state change signal. It may include.
  • variable inductance unit may include a plurality of inductors connected in series with each other, and the variable resistance unit may include a plurality of resistors connected in series with each other.
  • the maximum impedance of the variable inductance unit and the maximum impedance of the variable resistance unit may be the same, and the number of the plurality of inductors may be the same as the number of the plurality of resistors.
  • variable inductance unit may further include a plurality of inductor tabs provided at each node of the plurality of inductors
  • variable resistance unit may further include a plurality of resistance taps provided at each node of the plurality of resistors.
  • the control unit may include a connection line connecting one of the plurality of inductor tabs and one of the plurality of resistance tabs to each other.
  • the in turn is sequentially set from the inductor tap close to the breaker for the plurality of inductor taps, and the turn is sequentially set from the resistive tap close to the breaker for the plurality of resistor taps
  • the order of the connected inductor tap and the order of the resistor tap connected to the connection line may be the same.
  • the controller may control the connection of the connection line such that the order of the inductor tap connected to the connection line and the order of the resistance tap connected to the connection line increase or decrease sequentially based on the state change signal. Can be.
  • the controller controls the order of the inductor tap connected to the connection line and the order of the resistance tap connected to the connection line to be sequentially increased, and then connected to the connection line.
  • the order of the inductor taps and the order of the resistance taps connected to the connection line may be controlled to decrease in sequence.
  • the circuit breaker is provided in the track is closed or closed based on the state change signal;
  • An impedance unit connected to the breaker and having an impedance whose magnitude is maintained while the ratio of resistance and reactance is variable according to the state change signal;
  • a controller configured to change the state of the circuit breaker and the impedance of the impedance unit by generating the state change signal. It may include.
  • the impedance unit when the impedance unit receives a state change signal from the controller, the impedance unit may have an impedance that increases the reactance before the circuit breaker is turned on or off, and decreases the reactance after the circuit breaker is closed or closed.
  • the present invention it is possible to prevent generation of overvoltage and to prevent inrush current, re-calling phenomenon, and current cutting phenomenon while compensating reactive power of a line.
  • FIG. 1 is a view showing a shunt reactor according to an embodiment of the present invention.
  • FIG. 2 is a view showing a track system according to an embodiment of the present invention.
  • FIG. 3 is a diagram illustrating a location of a shunt reactor in the track system of FIG. 2.
  • FIG 4 is a graph showing the voltage at the normal shutdown of the shunt reactor according to an embodiment of the present invention.
  • FIG. 5 is a graph showing the voltage at the current cut back of the shunt reactor according to an embodiment of the present invention.
  • FIG. 6 is a flowchart illustrating a shunt reactor control method according to an embodiment of the present invention.
  • FIG. 1 is a view showing a shunt reactor according to an embodiment of the present invention.
  • the shunt reactor 100 may include a variable inductance unit 110, a variable resistance unit 120, and a controller 130.
  • the variable inductance unit 110 may be connected to the breaker through a line and may have a variable inductance. As the inductance is variable, the reactance of the shunt reactor 100 may be variable.
  • variable inductance unit 110 includes a plurality of inductors L1, L2, L3, and L4 connected in series with each other, and a plurality of inductor taps tap 1L, tap 2L, and tap provided at each node of the plurality of inductors. 3L, tap 4L, tap 5L).
  • One end of the plurality of inductors L1, L2, L3, and L4 may be connected to a line, and the other end thereof may be in an open state.
  • the resistor may be connected to one of the plurality of inductor taps tap 1L, tap 2L, tap 3L, tap 4L, and tap 5L.
  • An inductor positioned between one end of the plurality of inductors L1, L2, L3, L4 and an inductor tap connected to a resistor among the plurality of inductor taps tap 1L, tap 2L, tap 3L, tap 4L, and tap 5L
  • the total inductance of is the inductance of the shunt reactor (100).
  • the number of inductor taps may be determined in consideration of ease of design, fabrication, operation.
  • the variable resistance unit 120 may be connected to the breaker through a line and may have a variable resistance. As the resistance is variable, the resistance of the shunt reactor 100 may be variable.
  • variable resistance unit 120 includes a plurality of resistors R1, R2, R3, and R4 connected in series with each other and a plurality of resistor taps 1 Tap, tap 2R, and taps provided at each node of the plurality of resistors. 3R, tap 4R, tap 5R).
  • One end of the plurality of resistors R1, R2, R3, and R4 may be connected to a second line that is AC grounded with respect to the line, and the other end may be in an open state.
  • the inductor tap may be connected to one of the plurality of resistance taps tap 1R, tap 2R, tap 3R, tap 4R, and tap 5R.
  • the resistance tap Located between one end of the plurality of resistors (R1, R2, R3, R4) and the resistance tap connected to the inductor tap of the plurality of resistance taps (tap 1R, tap 2R, tap 3R, tap 4R, tap 5R).
  • the total resistance of the resistance is the resistance of the shunt reactor 100.
  • the number of resistors R1, R2, R3, and R4 may be equal to the number of inductors L1, L2, L3, and L4. Accordingly, while maintaining the total number of resistors and inductors connected in series from one end of the variable resistance unit 120 to one end of the variable inductance unit 110, the ratio of the resistors and the inductor may be varied. Therefore, the ratio of reactance and resistance can be easily varied while maintaining the impedance of the shunt reactor 100.
  • the square of the impedance of the shunt reactor 100 may be the sum of the square of the resistance of the variable resistance unit 120 and the square of the reactance of the variable inductance unit 110. If the resistance of the variable resistance unit 120 is close to zero, the impedance of the shunt reactor 100 may be close to the reactance of the variable inductance unit 110. If the inductance of the variable inductance unit 110 is close to zero, the impedance of the shunt reactor 100 may be close to the resistance of the variable resistance unit 120. Therefore, when the maximum resistance size of the variable resistance unit 120 and the maximum reactance size of the variable inductance unit 110 are the same, the impedance ratio of the shunt reactor 100 is easily maintained while the ratio of reactance and resistance is easily variable. Can be.
  • At least one inductor of the plurality of inductors L1, L2, L3, and L4 has an inductance according to Equation 1 below, and at least one of the plurality of resistors R1, R2, R3, and R4 is low.
  • the On Load Tap Changer term may have a resistance according to Equation 2 below. Where N tap represents the number of inductors, V n represents reactive power, and S represents apparent power.
  • one inductance value may be 400mH, and one resistance value may be 150 ohms.
  • the controller 130 receives the state change signal of the circuit breaker and changes the variable inductance such that one of the inductance of the variable inductance unit 110 and the resistance of the variable resistance unit 120 is increased and the other is reduced based on the state change signal.
  • the unit 110 and the variable resistance unit 120 may be controlled together. Accordingly, the ratio of reactance and resistance of the shunt reactor 100 may be changed.
  • the controller 130 controls a connection position of the connection line 131 connecting one of the plurality of inductor taps and one of the plurality of resistor taps to each other through an on load tap changer (OLTC). can do.
  • OLTC on load tap changer
  • the order of the resistance tabs connected to the connection line 131 may be the same. Accordingly, the ratio of reactance and resistance can be easily changed while maintaining the impedance of the shunt reactor 100.
  • control unit 130 is connected to the connection line 131 so that the order of the inductor tap connected to the connection line 131 and the order of the resistance tap connected to the connection line 131 increases or decreases sequentially based on the state change signal. ) Can be controlled.
  • the controller 130 controls the order of the inductor tap connected to the connection line 131 and the order of the resistance tap connected to the connection line 131 to be sequentially increased, and then the connection line 131 ) May be controlled so that the order of the inductor tap connected to the ()) and the order of the resistance tap connected to the connection line 131 may be sequentially decreased.
  • inrush current, re-calling phenomenon and current cutting phenomenon may occur in the process of blocking or closing the circuit breaker.
  • the inrush current may occur mainly when the transformer is put in a no-load state or when a capacitor load, which is an ancestor facility, is input. In the shunt reactor, the inrush current may also occur depending on the current-magnetic flux characteristics. When the breaker is input in the presence of residual magnetic flux, inrush current may occur when the magnetic flux is offset to the saturation region of the current-magnetic flux curve. The inrush current can cause mechanical damage to the inductor windings, thereby shortening the product life. In addition, an inrush current of several tens of normal load currents may cause a protection relay malfunction, and may cause a decrease in power quality.
  • the re-calling phenomenon is a phenomenon frequently occurring when the breaker cuts off a small current relatively smaller than the fault current, and has a high transient recovery voltage in a state where the insulation strength between the breaker contacts is not sufficient due to a short arc time. When exposed to, it means that the current is re-energized. If the arc current that is re-energized at the re-call occurrence does not occur at the breaker arc contact and is generated at another part such as a nozzle where the electric field is concentrated, the re-call phenomenon may act as a serious failure factor along with the breaker performance. In addition, if not only a single re-call, but also leads to multiple re-calls, stepped voltage increases may cause serious voltage stress in the circuit breaker as well as the system, which may cause interlayer insulation breakdown of the inductor's winding.
  • the current cutting phenomenon refers to a phenomenon in which a gas circuit breaker having a fault current blocking capability of several tens of kA forcibly cuts off a current before a natural zero along the power frequency in the process of blocking a small current.
  • overvoltage may occur due to rapid current change.
  • the inrush current, the recalling phenomenon and the current cutting phenomenon can be prevented by changing the inductance of the variable inductance unit 110 and the resistance of the variable resistance unit 120.
  • the controller 130 when the breaker is cut off or closed, the controller 130 reduces the inductance of the variable inductance unit 110 and increases the resistance of the variable resistance unit 120, thereby inducing inrush current, re-call phenomenon, and current cutting phenomenon. Occurrence can be prevented.
  • the controller 130 may compensate for reactive power of the line by increasing the inductance of the variable inductance unit 110 and reducing the resistance of the variable resistance unit 120. . That is, the shunt reactor 100 according to an embodiment of the present invention can prevent inrush current, re-calling phenomenon and current cutting phenomenon while compensating for reactive power of a line.
  • the controller 130 maintains the overall impedance size of the variable inductance unit 110 and the variable resistance unit 120 to improve the power quality of the line, increase the product life, and reduce the product maintenance cost. can do.
  • the controller 130 sequentially changes the inductance of the variable inductance unit 110 and the resistance of the variable resistance unit 120, thereby improving the power quality of the line and increasing the product life and cost of product maintenance. Can reduce the cost.
  • FIG. 2 is a view showing a track system according to an embodiment of the present invention.
  • the line system 200 may include a breaker 210, an impedance unit 220, and a controller 230.
  • the breaker 210 may be provided in a line and may be input or blocked based on a state change signal.
  • the breaker 210 may be a gas circuit breaker SF 6 , and may further include a capacitor Cp and an inductor Lp connected in parallel.
  • the breaker 210 may vary depending on system operating conditions, but frequent opening and closing may be performed about once or twice a day.
  • the circuit breaker 210 may open and close the size of the load current of about 300A, but may cause harmful overvoltage to the system during the opening and closing operation due to the characteristic of the impedance unit 220 having a power factor of about 90 degrees above the ground.
  • the impedance unit 220 may be connected to the circuit breaker 210 and may have an impedance whose magnitude is maintained while the ratio of resistance and reactance is variable according to a state change signal. Accordingly, the phase may be changed while the magnitude of the current flowing through the impedance unit 220 is maintained.
  • the impedance unit 220 may include a resistor, an inductor, and a capacitor CL. That is, the reactance of the impedance unit 220 may be affected by the capacitor CL.
  • the reactance unit 220 when the impedance unit 220 receives the state change signal, the reactance increases before the breaker 210 is input or cut off, and has the impedance that the reactance decreases after the closing or closing of the breaker 210 is completed. Can be.
  • the impedance unit 220 may prevent generation of inrush current, re-calling phenomenon, and current cutting phenomenon while compensating for reactive power of the line.
  • the controller 230 may generate a state change signal to change the state of the circuit breaker 210 and the impedance of the impedance unit 220.
  • the controller 230 applies an input signal to the circuit breaker 210 and the impedance unit 220 when the charging current flows into the line, and cuts off a predetermined time after the charging current flows into the line.
  • the signal may be applied to the breaker 210 and the impedance unit 220. Accordingly, the impedance unit 220 may lower the voltage of the line by absorbing (offset) an increase in reactive power of the line.
  • the breaker 210 may pass the power transmitted from the power source (S).
  • a capacitor Cs and an inductor Ls may be connected between the power source S and the breaker 210.
  • an inductor Lb may be connected between the breaker 210 and the impedance unit 220.
  • FIG. 3 is a diagram illustrating a location of a shunt reactor in the track system of FIG. 2.
  • the shunt reactor (Sh.R) may be installed on the main bus (T / L) and the drawing bus (M / Tr) of the 345kV substation or on the tertiary side (23kV) if necessary.
  • a separate breaker (Sec. CB) may be installed to open and close the shunt reactor.
  • a shunt reactor may be installed at a point where a long distance high voltage transmission line (# 1BUS) or an underground line (# 2BUS) is concentrated.
  • FIG 4 is a graph showing the voltage at the normal shutdown of the shunt reactor according to an embodiment of the present invention.
  • Figure 4 (a) is a graph showing the voltage during normal shutdown in the shunt reactor with a variable impedance as time passes, and Figure 4 (b) shows the voltage during normal shutdown in a shunt reactor with a variable impedance. The graph shows the flow.
  • inrush current may be generated by offsetting the magnetic flux into the saturation region of the current-magnetic flux characteristic curve, but in FIG. 4B, the inrush current may not be generated.
  • FIG. 5 is a graph showing the voltage at the current cut back of the shunt reactor according to an embodiment of the present invention.
  • Figure 5 (a) is a graph showing the voltage at the current reset in the shunt reactor with a variable impedance as time passes, and Figure 5 (b) shows the voltage at the current reset in a shunt reactor with a variable impedance The graph shows the flow.
  • control method of a shunt reactor may be performed by the shunt reactor and / or the line system described above with reference to FIGS. 1 to 5, the same or equivalent contents as those described above will not be described. .
  • FIG. 6 is a flowchart illustrating a shunt reactor control method according to an embodiment of the present invention.
  • the controller starts operation of the shunt reactor Sh.R (S10), checks the position of the tap (S20), and if the position of the tap is not at the bottom, sequentially lowers the position of the tap ( S21), and when the position of the tap is the lowest, the breaker may be input by applying an open / close signal to the breaker (S22).
  • the lowering of the position of the tap means a decrease in the order of the tap.
  • the controller After closing or closing of the breaker, the controller operates or stops the shunt reactor (Sh.R), checks the position of the tap (S40), and if the tap position is not at the top, sets the position of the tap. If it is raised (S41), and the position of the tap is the highest position, the operation of the shunt reactor can be terminated.
  • the increase in the position of the tap means an increase in the order of the taps.
  • the shunt reactor (Sh.R) can prevent the occurrence of inrush current, re-call phenomenon and current cutting phenomenon while compensating the reactive power of the line.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

Selon un mode de réalisation de la présente invention, un réacteur shunt comprend : une partie à inductance variable connectée à un disjoncteur par l'intermédiaire d'une ligne et disposant d'une inductance variable ; une partie à résistance variable connectée au disjoncteur par l'intermédiaire d'une ligne et disposant d'une résistance variable ; et une partie de commande qui reçoit un signal de changement d'état du disjoncteur, et commande, sur la base du signal de changement d'état, la partie inductance variable et la partie à résistance variable en même temps, de telle sorte que l'inductance de la partie à inductance variable ou la résistance de la partie à résistance variable est augmentée et l'autre est diminuée, ce qui permet d'empêcher une surtension tout en compensant la puissance réactive de la ligne.
PCT/KR2016/011268 2016-10-07 2016-10-07 Réacteur shunt, système de ligne comprenant ledit réacteur, et procédé de commande dudit réacteur shunt Ceased WO2018066739A1 (fr)

Priority Applications (1)

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PCT/KR2016/011268 WO2018066739A1 (fr) 2016-10-07 2016-10-07 Réacteur shunt, système de ligne comprenant ledit réacteur, et procédé de commande dudit réacteur shunt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2016/011268 WO2018066739A1 (fr) 2016-10-07 2016-10-07 Réacteur shunt, système de ligne comprenant ledit réacteur, et procédé de commande dudit réacteur shunt

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004295420A (ja) * 2003-03-26 2004-10-21 Nippon Eco System Kk 自動電圧制御装置
KR20100128066A (ko) * 2009-05-27 2010-12-07 양영철 비투자율 변화 특성을 이용한 역률보상설비용 직렬리액터
KR101036794B1 (ko) * 2005-02-10 2011-05-25 비쉐이-실리코닉스 보상 회로
KR101076327B1 (ko) * 2009-02-04 2011-10-26 김양수 용량 조절이 가능한 분로리액터 및 이를 이용한 교류전압 조절장치
KR101143020B1 (ko) * 2010-12-07 2012-05-09 김영진 분로리액터의 용량 산출 방법
KR20170037791A (ko) * 2015-09-25 2017-04-05 한국전력공사 분로리액터, 그를 포함하는 선로 시스템 및 분로리액터 제어 방법

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004295420A (ja) * 2003-03-26 2004-10-21 Nippon Eco System Kk 自動電圧制御装置
KR101036794B1 (ko) * 2005-02-10 2011-05-25 비쉐이-실리코닉스 보상 회로
KR101076327B1 (ko) * 2009-02-04 2011-10-26 김양수 용량 조절이 가능한 분로리액터 및 이를 이용한 교류전압 조절장치
KR20100128066A (ko) * 2009-05-27 2010-12-07 양영철 비투자율 변화 특성을 이용한 역률보상설비용 직렬리액터
KR101143020B1 (ko) * 2010-12-07 2012-05-09 김영진 분로리액터의 용량 산출 방법
KR20170037791A (ko) * 2015-09-25 2017-04-05 한국전력공사 분로리액터, 그를 포함하는 선로 시스템 및 분로리액터 제어 방법

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