CN114156903A - Intelligent reactive compensation module control circuit and control method thereof - Google Patents

Intelligent reactive compensation module control circuit and control method thereof Download PDF

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Publication number
CN114156903A
CN114156903A CN202111456580.1A CN202111456580A CN114156903A CN 114156903 A CN114156903 A CN 114156903A CN 202111456580 A CN202111456580 A CN 202111456580A CN 114156903 A CN114156903 A CN 114156903A
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China
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circuit
control
switch
voltage
current
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CN202111456580.1A
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Inventor
沈卫峰
冯国伟
张锐
孟领刚
沈周斌
王宗臣
夏文
夏武
邱素素
李天鹰
薛玲丽
陈佳佳
柳振铁
杨建�
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Jiangsu Modern Electric Technology Co ltd
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Jiangsu Modern Electric Technology Co ltd
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Priority to CN202111456580.1A priority Critical patent/CN114156903A/en
Publication of CN114156903A publication Critical patent/CN114156903A/en
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    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
    • H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
    • 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
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • 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
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Human Computer Interaction (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The invention discloses an intelligent reactive compensation module control circuit which comprises a low-voltage power capacitor body C, a main switch Z, a microprocessor circuit M, a switch circuit A1, a switch circuit A2, a voltage detection circuit V1, a voltage detection circuit V2, a current detection circuit I, a temperature acquisition circuit W, a communication circuit T, a power circuit P and a man-machine contact module R, wherein the switch circuit A1, the switch circuit A2, the voltage detection circuit V1, the voltage detection circuit V2, the current detection circuit I, the temperature acquisition circuit W, the communication circuit T, the power circuit P and the man-machine contact module R are respectively connected with the microprocessor circuit M. The invention solves the problems that the zero crossing point detection is inaccurate and the switching inrush current is large under the condition that harmonic waves exist in the conventional reactive compensation capacitor or interference exists in the capacitor switching process, so that the capacitor bank is easy to damage and the like, and improves the reliability of reactive compensation.

Description

Intelligent reactive compensation module control circuit and control method thereof
Technical Field
The invention relates to a control circuit and a control method thereof, in particular to an intelligent reactive compensation module control circuit and a control method thereof, belonging to the field of power capacitance equipment.
Background
The intelligent reactive compensation capacitor is an intelligent reactive compensation device integrating advanced technologies such as modern measurement and control, power electronics, network communication, automatic control, power capacitors and the like. The intelligent reactive compensation capacitor changes the backward control technology of the traditional reactive compensation device and the backward switching technology of a mechanical contactor or a mechatronic switch as a switching capacitor, and changes the structural mode of large volume and heaviness of the traditional reactive compensation device, so that the new generation of low-voltage reactive compensation equipment has the characteristics of better compensation effect, smaller volume, lower power consumption, lower price, more cost saving, more flexible use, more convenient maintenance, longer service life and higher reliability, and is suitable for the higher requirement of the modern power grid on reactive compensation.
The reactive power compensation capacitor in the prior art needs zero-crossing switching, namely, the zero-crossing point of the system voltage needs to be detected, and then the control switch is switched at the zero point. However, under the condition that harmonic waves exist or interference exists in the switching process of the capacitor, the control module can misjudge the zero point, so that the problems that switching inrush current is large due to false zero point switching, the capacitor bank is damaged and the like are caused.
Disclosure of Invention
The invention aims to provide an intelligent reactive compensation module control circuit and a control method thereof, and improve the switching reliability of a reactive compensation capacitor.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides an intelligence reactive compensation module control circuit which characterized in that: comprises a low-voltage power capacitor body C, a main switch Z, a microprocessor circuit M, a switch circuit A1, a switch circuit A2, a voltage detection circuit V1, a voltage detection circuit V2, a current detection circuit I, a temperature acquisition circuit W, a communication circuit T, a power supply circuit P and a man-machine contact module R, wherein the switch circuit A1, the switch circuit A2, the voltage detection circuit V1, the voltage detection circuit V2, the current detection circuit I, the temperature acquisition circuit W, the communication circuit T, the power supply circuit P and the man-machine contact module R are respectively connected with the microprocessor circuit M, the main switch Z is connected with the low-voltage power capacitor body C in a three-phase manner, the switch circuit A1 and the switch circuit A2 are respectively arranged on two phase lines a and C between the main switch Z and the low-voltage power capacitor body C, the voltage detection circuit V1 detects the voltage at two ends of the switch circuit A1, the voltage detection circuit V2 detects the voltage at two ends of the switch circuit A2, the current detection circuit I detects a line current of a phase and a phase between the main switch Z and the low-voltage power capacitor body C respectively, the temperature acquisition circuit W is arranged in the low-voltage power capacitor body C, and the power circuit P provides working power for all circuits.
Further, the main switch Z employs a circuit breaker or a fuse.
Furthermore, the communication circuit T is provided with an RS-485 communication interface, and the intelligent reactive compensation modules and the reactive compensation controller are in online communication through the RS-485 communication interfaces.
Furthermore, the man-machine contact module R adopts a liquid crystal display or a nixie tube, the microprocessor circuit M displays the measured and calculated line voltage, current, power factor, active power and reactive power as well as the running parameters and states of the capacitor through the man-machine contact module R, and meanwhile, the man-machine contact module R stores the parameter information set manually in the microprocessor circuit M.
Further, the switch circuit a1 and the switch circuit a2 respectively include a one-way thyristor S1, a one-way thyristor S2, a first control circuit K1, a second control circuit K2, a relay J1 and a third control circuit K3, the one-way thyristor S1, the one-way thyristor S2 and the relay J1 are arranged between two ends of the switch circuit a1 or the switch circuit a2 in parallel, the one-way thyristor S1 and the one-way thyristor S2 are connected in parallel in an opposite direction, the first control circuit K1 is respectively connected with a control end of the one-way thyristor S1 and the microprocessor circuit M, the second control circuit K2 is respectively connected with a control end of the one-way thyristor S2 and the microprocessor circuit M, and the third control circuit K3 is respectively connected with a control end of the relay J1 and the microprocessor circuit M.
Furthermore, the current measuring circuit I is connected with the line current sampling interface Y and used for detecting a line current signal transmitted by the external sampling current sensor, and the current detecting circuit I is connected with the current sensor CT1 and the current sensor CT2 and used for detecting a capacitor current signal transmitted by the current sensor on the internal switching circuit.
A control method of an intelligent reactive compensation module control circuit is characterized by comprising the following steps:
the microprocessor circuit M controls the closing process of the switch circuit as follows:
1) a voltage signal between the switch circuits U1 and U2 is detected by a voltage detection circuit V, the voltage signal is a sine wave in the breaking state of the switch circuits, a control signal is sent out in the t1 time period of the negative half cycle of the sine wave, and the control signal is added to a control electrode G and a cathode K of the unidirectional silicon controlled rectifier S1 through a first control circuit K1;
2) a control signal is added to a control electrode G and a cathode K of the unidirectional silicon controlled rectifier S2 through a second control circuit K2 in the time period of the positive half cycle t2 of the sine wave;
3) in the time period t3 or later than the negative half cycle of the sine wave, the relay J1 is controlled to be closed by the third control circuit K3, and the switch circuit A is closed;
when the microprocessor circuit M controls the switching-off of the switching circuit:
1) the relay J1 is switched off through the third control circuit K3, and the relay J1 is delayed to be switched off;
2) the control signals on the control electrode G and the cathode K of the unidirectional silicon controlled rectifier S1 are cancelled through the first control circuit K1, the control signals on the control electrode G and the cathode K of the unidirectional silicon controlled rectifier S2 are cancelled through the second control circuit K2, and the switching circuit A completes breaking.
Compared with the prior art, the invention has the following advantages and effects: according to the intelligent reactive compensation module control circuit and the control method thereof, zero-voltage switching-on and current zero-crossing switching-off at two ends of a switching circuit A are realized only by completing control in a corresponding time period without detecting a zero crossing point and controlling switching action at the zero crossing point in the switching-on and switching-off process of a control switching circuit; the problems that the zero crossing point of a conventional reactive compensation capacitor is inaccurate in detection and large in switching inrush current under the condition that harmonic waves exist or interference exists in the switching process of the capacitor, so that a capacitor bank is easy to damage and the like are solved, and the reliability of reactive compensation is improved.
Drawings
Fig. 1 is a schematic diagram of an intelligent reactive compensation module control circuit of the present invention.
Fig. 2 is a schematic diagram of the switching circuit of the present invention.
Fig. 3 is a time period diagram of an intelligent reactive compensation module control method of the present invention.
Detailed Description
To elaborate on technical solutions adopted by the present invention to achieve predetermined technical objects, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, it is obvious that the described embodiments are only partial embodiments of the present invention, not all embodiments, and technical means or technical features in the embodiments of the present invention may be replaced without creative efforts, and the present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.
As shown in fig. 1, the intelligent reactive compensation module control circuit of the present invention comprises a low voltage power capacitor body C, a main switch Z, a microprocessor circuit M, a switch circuit a1, a switch circuit a2, a voltage detection circuit V1, a voltage detection circuit V2, a current detection circuit I, a temperature acquisition circuit W, a communication circuit T, a power circuit P, and a man-machine communication module R, wherein the switch circuit a1, the switch circuit a2, the voltage detection circuit V1, the voltage detection circuit V2, the current detection circuit I, the temperature acquisition circuit W, the communication circuit T, the power circuit P, and the man-machine communication module R are respectively connected to the microprocessor circuit M, the main switch Z is connected to the low voltage power capacitor body C in three phases, the switch circuit a1 and the switch circuit a2 are respectively disposed on two phase lines a and C between the main switch Z and the low voltage power capacitor body C, the voltage detection circuit V1 detects the voltage at two ends of the switch circuit a1, the voltage detection circuit V2 detects the voltage at two ends of the switch circuit A2, the current detection circuit I detects the a and C two-phase line current between the main switch Z and the low-voltage power capacitor body C respectively, the temperature acquisition circuit W is arranged in the low-voltage power capacitor body C, and the power circuit P provides working power for each circuit.
The temperature acquisition circuit W is arranged in the low-voltage power capacitor body C, is connected with the microprocessor circuit M and is used for detecting the temperature of the capacitor and realizing the over-temperature protection of the capacitor. The main switch Z may be a circuit breaker or a fuse, and the outlet terminal of the main switch Z is respectively connected to the switch circuit a1, the switch circuit a2 and one of the capacitor bodies, and the other two phases of the capacitor bodies are respectively connected to the switch circuit a1 and the switch circuit a2, so that when the intelligent reactive compensation module is short-circuited or over-current occurs, the main switch Z is disconnected to cut off the main loop power supply.
The microprocessor circuit M is connected with the voltage detection circuit V, the current detection circuit I, the temperature sensor W, the communication circuit T and the man-machine communication module R, calculates parameters of voltage, current, power factor, active power, reactive power and the like of a line according to detected voltage signals and current signals, and then automatically controls or receives control commands according to the calculated parameters and the state of the capacitor, and puts in or cuts off the low-voltage power capacitor body C through the control switch circuit A1 and the switch circuit A2.
The communication circuit T is connected with the microprocessor circuit M, an RS-485 communication interface is arranged outside the communication circuit T, and online communication is carried out between the intelligent reactive compensation modules and the reactive compensation controller through the communication interfaces. The man-machine contact module R adopts a liquid crystal display or a nixie tube, the microprocessor circuit M displays the measured and calculated line voltage, current, power factor, active power and reactive power as well as the running parameters and states of the capacitor through the man-machine contact module R, and meanwhile, the man-machine contact module R stores the parameter information set manually in the microprocessor circuit M.
As shown in fig. 2, the switch circuit a1 and the switch circuit a2 respectively control two-phase loops of the low-voltage power capacitor body C, the switch circuit a1 and the switch circuit a2 respectively include a one-way thyristor S1, a one-way thyristor S2, a first control circuit K1, a second control circuit K2, a relay J1 and a third control circuit K3, the one-way thyristor S1, the one-way thyristor S2 and the relay J1 are arranged between two ends of the switch circuit a1 or the switch circuit a2 in parallel, the one-way thyristor S1 and the one-way thyristor S2 are connected in parallel in an opposite direction, the first control circuit K1 is respectively connected with a control end of the one-way thyristor S1 and the microprocessor circuit M, the second control circuit K2 is respectively connected with a control end of the one-way thyristor S2 and the microprocessor circuit M, and the third control circuit K3 is respectively connected with a control end of the relay J1 and the microprocessor circuit M.
The voltage detection circuit V1 and the voltage detection circuit V2 respectively detect voltage signals at two ends of the switch circuit a1 and the switch circuit a2, transmit the voltage signals to the microprocessor circuit M, and provide input power for the power circuit P. The current measuring circuit I is connected with the line current sampling interface Y and used for detecting a line current signal transmitted by the external sampling current sensor, and the current detecting circuit I is connected with the current sensor CT1 and the current sensor CT2 and used for detecting a capacitor current signal transmitted by the current sensor on the internal switch circuit.
As shown in fig. 3, a control method of an intelligent reactive compensation module control circuit includes the following steps:
the microprocessor circuit M controls the closing process of the switch circuit as follows:
1) a voltage signal between the switch circuits U1 and U2 is detected by a voltage detection circuit V, the voltage signal is a sine wave in the breaking state of the switch circuits, a control signal is sent out in the t1 time period of the negative half cycle of the sine wave, and the control signal is added to a control electrode G and a cathode K of the unidirectional silicon controlled rectifier S1 through a first control circuit K1; at the moment, the voltage signal of the switching circuit is opposite to the conduction direction of the one-way thyristor S1, the one-way thyristor S1 has no current, and the problem of inrush current cannot be caused by controlling the conduction of the one-way thyristor S1.
2) A control signal is added to a control electrode G and a cathode K of the unidirectional silicon controlled rectifier S2 through a second control circuit K2 in the time period of the positive half cycle t2 of the sine wave; at the moment, the voltage signal of the switching circuit is opposite to the conduction direction of the one-way thyristor S2, the one-way thyristor S2 has no current, the problem of inrush current cannot be caused by controlling the conduction of the one-way thyristor S2, and the actual current forms a loop from the one-way thyristor S1.
3) In the time period t3 or later than the negative half cycle of the sine wave, the relay J1 is controlled to be closed by the third control circuit K3, and the switch circuit A is closed; when the one-way thyristors S1 and S2 are in a loop, a new loop is formed when the relay J1 is closed, and a large inrush current problem cannot be caused.
Zero-voltage switching-on at two ends of the switching circuit A can be realized only by completing control in a corresponding time period without detecting a zero crossing point and controlling switching action at the zero crossing point in the whole switching-on process.
When the microprocessor circuit M controls the switching-off of the switching circuit:
1) the relay J1 is switched off through the third control circuit K3, and the relay J1 is delayed to be switched off;
2) the control signals on the control electrode G and the cathode K of the unidirectional silicon controlled rectifier S1 are cancelled through the first control circuit K1, the control signals on the control electrode G and the cathode K of the unidirectional silicon controlled rectifier S2 are cancelled through the second control circuit K2, and the switching circuit A completes breaking. Because the self characteristic of the unidirectional silicon controlled rectifier S2 is as long as current exists, even if the control signal is cut off, the unidirectional silicon controlled rectifier S2 can not be cut off immediately, but the cut-off is finished when the current signal is 0, therefore, when the current flows through a 0 point, the unidirectional silicon controlled rectifier S2 can be cut off, the automatic zero point control is realized, based on the principle, the time interval does not need to be considered when the unidirectional silicon controlled rectifier is separated during the separation, no matter the sine wave is positioned in a positive cycle or a negative cycle, when the current direction is opposite to that of the unidirectional silicon controlled rectifier, the unidirectional silicon controlled rectifier has no current and can be directly cut off, the other unidirectional silicon controlled rectifier is in the same direction as the current at the moment, and after the control signal is cut off, the unidirectional silicon controlled rectifier is automatically cut off at the 0 point of the current.
The zero-crossing point is not required to be detected in the whole brake-separating process, the switching action is not required to be controlled at the zero-crossing point, and the zero-crossing brake-separating of the current of the switching circuit A can be realized only by completing the control at the corresponding time period.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (7)

1. The utility model provides an intelligence reactive compensation module control circuit which characterized in that: comprises a low-voltage power capacitor body C, a main switch Z, a microprocessor circuit M, a switch circuit A1, a switch circuit A2, a voltage detection circuit V1, a voltage detection circuit V2, a current detection circuit I, a temperature acquisition circuit W, a communication circuit T, a power supply circuit P and a man-machine contact module R, wherein the switch circuit A1, the switch circuit A2, the voltage detection circuit V1, the voltage detection circuit V2, the current detection circuit I, the temperature acquisition circuit W, the communication circuit T, the power supply circuit P and the man-machine contact module R are respectively connected with the microprocessor circuit M, the main switch Z is connected with the low-voltage power capacitor body C in a three-phase manner, the switch circuit A1 and the switch circuit A2 are respectively arranged on two phase lines a and C between the main switch Z and the low-voltage power capacitor body C, the voltage detection circuit V1 detects the voltage at two ends of the switch circuit A1, the voltage detection circuit V2 detects the voltage at two ends of the switch circuit A2, the current detection circuit I detects a line current of a phase and a phase between the main switch Z and the low-voltage power capacitor body C respectively, the temperature acquisition circuit W is arranged in the low-voltage power capacitor body C, and the power circuit P provides working power for all circuits.
2. The intelligent reactive compensation module control circuit of claim 1, wherein: the main switch Z adopts a circuit breaker or a fuse.
3. The intelligent reactive compensation module control circuit of claim 1, wherein: and the communication circuit T is provided with an RS-485 communication interface, and the intelligent reactive compensation modules and the reactive compensation controller are in online communication through the RS-485 communication interfaces.
4. The intelligent reactive compensation module control circuit of claim 1, wherein: the man-machine contact module R adopts a liquid crystal display or a nixie tube, the microprocessor circuit M displays the measured and calculated line voltage, current, power factor, active power and reactive power as well as the running parameters and states of the capacitor through the man-machine contact module R, and meanwhile, the man-machine contact module R stores the parameter information set manually in the microprocessor circuit M.
5. The intelligent reactive compensation module control circuit of claim 1, wherein: the switch circuit A1 and the switch circuit A2 respectively comprise a one-way thyristor S1, a one-way thyristor S2, a first control circuit K1, a second control circuit K2, a relay J1 and a third control circuit K3, the one-way thyristor S1, the one-way thyristor S2 and the relay J1 are arranged between two ends of the switch circuit A1 or the switch circuit A2 in parallel, the one-way thyristor S1 and the one-way thyristor S2 are connected in parallel in an opposite mode, the first control circuit K1 is respectively connected with a control end of the one-way thyristor S1 and a microprocessor circuit M, the second control circuit K2 is respectively connected with a control end of the one-way thyristor S2 and the microprocessor circuit M, and the third control circuit K3 is respectively connected with a control end of the relay J1 and the microprocessor circuit M.
6. The intelligent reactive compensation module control circuit of claim 1, wherein: the current measuring circuit I is connected with the line current sampling interface Y and used for detecting a line current signal transmitted by an external sampling current sensor, and the current detecting circuit I is connected with the current sensor CT1 and the current sensor CT2 and used for detecting a capacitor current signal transmitted by a current sensor on the internal switch circuit.
7. A control method of the intelligent reactive compensation module control circuit according to any one of claims 1-6, characterized by comprising the following steps:
the microprocessor circuit M controls the closing process of the switch circuit as follows:
1) a voltage signal between the switch circuits U1 and U2 is detected by a voltage detection circuit V, the voltage signal is a sine wave in the breaking state of the switch circuits, a control signal is sent out in the t1 time period of the negative half cycle of the sine wave, and the control signal is added to a control electrode G and a cathode K of the unidirectional silicon controlled rectifier S1 through a first control circuit K1;
2) a control signal is added to a control electrode G and a cathode K of the unidirectional silicon controlled rectifier S2 through a second control circuit K2 in the time period of the positive half cycle t2 of the sine wave;
3) in the time period t3 or later than the negative half cycle of the sine wave, the relay J1 is controlled to be closed by the third control circuit K3, and the switch circuit A is closed;
when the microprocessor circuit M controls the switching-off of the switching circuit:
1) the relay J1 is switched off through the third control circuit K3, and the relay J1 is delayed to be switched off;
2) the control signals on the control electrode G and the cathode K of the unidirectional silicon controlled rectifier S1 are cancelled through the first control circuit K1, the control signals on the control electrode G and the cathode K of the unidirectional silicon controlled rectifier S2 are cancelled through the second control circuit K2, and the switching circuit A completes breaking.
CN202111456580.1A 2021-12-02 2021-12-02 Intelligent reactive compensation module control circuit and control method thereof Pending CN114156903A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1307389A (en) * 2000-01-28 2001-08-08 北京中电夸克电力技术研究所 Fully automatic contactless throw-in and throw-off reactive compensator
CN201611781U (en) * 2010-01-08 2010-10-20 杭州德力西集团有限公司 Multipath cascade intelligent capacitor with intelligent compensation
CN204304446U (en) * 2014-12-09 2015-04-29 江苏南自通华电力自动化有限公司 The quick harmonics restraint reactive power compensator of a kind of intelligent integrated formula
CN104716657A (en) * 2015-03-26 2015-06-17 江苏现代电力科技股份有限公司 Intelligent integrated power capacitance compensation device and load distribution method thereof
CN107039989A (en) * 2017-05-22 2017-08-11 龙岩学院 The new fling-cut switch of secondary capacitor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1307389A (en) * 2000-01-28 2001-08-08 北京中电夸克电力技术研究所 Fully automatic contactless throw-in and throw-off reactive compensator
CN201611781U (en) * 2010-01-08 2010-10-20 杭州德力西集团有限公司 Multipath cascade intelligent capacitor with intelligent compensation
CN204304446U (en) * 2014-12-09 2015-04-29 江苏南自通华电力自动化有限公司 The quick harmonics restraint reactive power compensator of a kind of intelligent integrated formula
CN104716657A (en) * 2015-03-26 2015-06-17 江苏现代电力科技股份有限公司 Intelligent integrated power capacitance compensation device and load distribution method thereof
CN107039989A (en) * 2017-05-22 2017-08-11 龙岩学院 The new fling-cut switch of secondary capacitor

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