CN113241775A - Low-cost reactive compensation control system - Google Patents
Low-cost reactive compensation control system Download PDFInfo
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- CN113241775A CN113241775A CN202110702915.7A CN202110702915A CN113241775A CN 113241775 A CN113241775 A CN 113241775A CN 202110702915 A CN202110702915 A CN 202110702915A CN 113241775 A CN113241775 A CN 113241775A
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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
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1864—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
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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
- 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
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- 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
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- 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
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- 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
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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- 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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/22—Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
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- 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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Abstract
The invention relates to a low-cost reactive compensation control system which comprises a plurality of intelligent reactive compensation devices and a sharing device, wherein the sharing device comprises a switching power supply circuit, a voltage sampling circuit, a current sampling circuit, a metering chip, a first MCU, a first internal networking communication circuit and a first external communication circuit, the intelligent reactive compensation devices comprise a voltage stabilizing circuit, a second MCU, a relay driving circuit, a relay state detection and capacitor voltage zero-crossing detection feedback circuit, a capacitance current sampling circuit, a second internal networking communication circuit and a second external communication circuit, and the intelligent reactive compensation devices are communicated with the sharing device through the connection of the first internal networking communication circuit and the second internal networking communication circuit. The reactive compensation control system simplifies circuit connection by arranging the sharing device, reduces power consumption, improves the processing efficiency of the second MCU, ensures that the time for switching the capacitor is more accurate, and reduces production cost.
Description
Technical Field
The invention relates to the technical field of power distribution, in particular to a low-cost reactive compensation control system.
Background
Reactive compensation is called reactive power compensation for short, and its principle is that a device with capacitive load and inductive load are parallelly connected in the same circuit, when the capacitive load releases energy, the inductive load absorbs energy, and when the inductive load releases energy, the capacitive load absorbs energy, and the energy is exchanged between two loads, so that the reactive power absorbed by inductive load can be compensated from the reactive power output by capacitive load. Reactive compensation is in an indispensable and very important place in power supply systems. The compensation device is reasonably selected to compensate, three-phase unbalanced current can be adjusted in a small system, adverse effects caused by harmonic waves are reduced, loss of a power grid is reduced, and the quality of the power grid is improved.
A plurality of reactive power compensation devices can be installed in an existing power distribution cabinet and used for controlling switching work of corresponding capacitors, power circuits and voltage and current sampling circuits are arranged on the reactive power compensation devices, a transformer with a large size is arranged on each power supply, a mutual inductor with a large size is arranged on each voltage and current sampling circuit, so that more components and parts are installed on the reactive power compensation devices, and the cost is high. When a large number of reactive power compensation devices are installed in the power distribution cabinet, the overall cost of the power distribution cabinet is undoubtedly increased, the operation processing speed of the reactive power compensation devices is influenced, and the operation power consumption of the reactive power compensation devices is increased.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a low-cost reactive compensation control system, which is not only convenient for installation in a power distribution cabinet, but also reduces the operation power consumption of a reactive compensation device, accelerates the operation processing speed thereof, and makes the capacitor switching more timely and reliable.
In order to achieve the above object, the present invention adopts a low-cost reactive compensation control system, comprising a plurality of intelligent reactive compensation devices and a common device,
the shared device comprises a switch power supply circuit, a voltage sampling circuit, a current sampling circuit, a metering chip, a first MCU, a first internal networking communication circuit and a first external communication circuit, wherein the input end of the switch power supply circuit is connected with an external alternating current power supply, the output end of the switch power supply circuit outputs direct current working voltage to supply power for each circuit of the intelligent reactive power compensation device through an RJ45 interface and a network cable, the input ends of the voltage sampling circuit and the current sampling circuit are respectively connected with an external three-phase alternating current power supply, the output ends of the voltage sampling circuit and the current sampling circuit are respectively connected with the input end of the metering chip, the metering chip is connected with the first MCU, the first internal networking communication circuit and the first external communication circuit are respectively connected with the first MCU,
the intelligent reactive power compensation device comprises a voltage stabilizing circuit, a second MCU, a relay driving circuit, a relay state detection and capacitor voltage zero crossing detection feedback circuit, a capacitance current sampling circuit, a second internal networking communication circuit and a second external communication circuit, wherein the input end of the voltage stabilizing circuit is connected with the output end of a switching power supply circuit, the output end of the voltage stabilizing circuit outputs direct current working voltage to supply power for each circuit of the intelligent reactive power compensation device, the input end of the capacitance current sampling circuit samples a capacitor current signal through a current transformer, the output end of the capacitance current sampling circuit is connected with the input end of the second MCU, the output end of the second MCU is connected with the input end of the relay driving circuit to control the action of the relay, the signal end of the relay state detection and capacitor voltage zero crossing detection feedback circuit is connected with the input end of the second MCU, and the second internal networking communication circuit and the second external communication circuit are respectively connected,
the intelligent reactive power compensation device realizes the communication of current, voltage and power factor sampling signals on the sharing device through the connection of the first internal networking communication circuit and the second internal networking communication circuit.
The reactive compensation control system is provided with a sharing device which comprises a switch power circuit, a voltage sampling circuit, a current sampling circuit and a metering chip, the output of the direct current voltage, the voltage sampling signal after metering and the current sampling signal after metering can be respectively realized, the obtained direct current voltage is used for the power supply of the intelligent reactive power compensation device through a voltage stabilizing circuit on the intelligent reactive power compensation device, and through the signal transmission of the first communication circuit and the second communication circuit, the sharing of voltage sampling signals and current sampling signals is realized, each intelligent reactive power compensation device obtains power grid signals, the second MCU controls the relay driving circuit according to the actual active power of a power grid, the switching of the capacitor is realized for reactive power compensation, and the first external communication circuit and the second external communication circuit enable the sharing device and the intelligent reactive power compensation device to be respectively in networking communication with the outside. The reactive compensation control system greatly simplifies circuits on a plurality of intelligent reactive compensation devices by arranging the sharing device, not only reduces the power consumption of the device, reduces the data information amount processed by the second MCU, increases the processing speed of the second MCU by phase change, and enables the speed of switching the capacitor of the intelligent reactive compensation device to be faster and more timely, but also extracts the sharing circuit on the intelligent reactive compensation device by the sharing device, so that the circuits on the intelligent reactive compensation device are simplified, and the quantity of components and the production cost of the intelligent reactive compensation device are reduced.
The invention is further arranged that the voltage sampling circuit comprises an A phase voltage sampling unit, a B phase voltage sampling unit and a C phase voltage sampling unit which are connected with each other by circuits, the A-phase voltage sampling unit comprises a voltage transformer PT1, a resistor R21, a resistor R22, a resistor R33, a resistor R36, a capacitor C32 and a capacitor C35, two ends of the primary side of the voltage transformer PT1 are connected with an external A-phase power supply, a resistor R21 and a resistor R22 are connected in series on the primary side of the voltage transformer PT1, one end of the resistor R33 and one end of the capacitor C32 are respectively connected with one end of the secondary side of the voltage transformer PT1, one end of the resistor R36 and one end of the capacitor C35 are respectively connected with the other end of the secondary side of the voltage transformer PT1, the other end of the resistor R33, the other end of the capacitor C32, the other end of the resistor R36 and the other end of the capacitor C35 are connected in common, and the two ends of the secondary side of the voltage transformer PT1 output A-phase voltage sampling signals to the input end of the metering chip.
The invention is further arranged that the current sampling circuit comprises a phase A current sampling unit, a phase B current sampling unit and a phase C current sampling unit which are connected with each other by circuits, the A-phase current sampling unit comprises a current transformer CT1, a resistor R27, a resistor R30, a resistor R39, a resistor R42, a capacitor C29 and a capacitor C38, two ends of the primary side of the current transformer CT1 are connected with an external A-phase power supply, one end of the secondary side of the current transformer CT1 is respectively connected with one end of a resistor R27 and one end of a resistor R30, the other end of the secondary side of the current transformer CT1 is respectively connected with one end of a resistor R39 and one end of a resistor R42, one end of the capacitor C29 is connected with the other end of the resistor R27, one end of the capacitor C38 is connected with the other end of the resistor R42, the other end of the resistor R30, the other end of the resistor R39, the other end of the capacitor C29 and the other end of the capacitor C38 are all grounded, the other end of the resistor R27 and the other end of the resistor R42 output A-phase current sampling signals to the input end of the metering chip.
The voltage transformer PT1 on the voltage sampling circuit and the current transformer CT1 on the current sampling circuit are both arranged on a shared device, so that the intelligent reactive compensation control device is not required to be provided with large-size components, the intelligent reactive compensation control device is convenient to install in a power distribution compensation cabinet, the voltage sampling circuit and the current sampling circuit are simple in integral connection and few in required components, and the production cost of the intelligent reactive compensation device can be further reduced.
The invention is further configured such that the relay state detection and capacitor voltage zero crossing detection feedback circuit comprises a plurality of sets of relay feedback units in circuit connection, the relay feedback unit comprises a resistor R3, a resistor R5, a photoelectric coupler O2 and a photoelectric coupler O3, one end of the resistor R5 and the anode of the photoelectric coupler O3 are connected with a relay, the other end of the resistor R5 is respectively connected with the anode of the photoelectric coupler O2 and the cathode of the photoelectric coupler O3, the cathode of the photoelectric coupler O2 is connected with the anode of the photoelectric coupler O3, the emitter of the photoelectric coupler O2 and the emitter of the photoelectric coupler O3 are both grounded, the collector of the photoelectric coupler O2 and the collector of the photoelectric coupler O3 are respectively connected with one end of a resistor R3, the other end of the resistor R3 is connected with a high level, and one end of a resistor R3 outputs a relay feedback signal to the input end of the second MCU.
The relay state detection and capacitor voltage zero-crossing detection feedback circuit monitors the working state of the relay and whether the relay is in a fault state, and ensures that each relay can work stably, so that the switching reliability of the capacitor is improved.
The invention further provides a capacitance current sampling circuit which comprises a plurality of groups of capacitance current sampling units which are connected in a consistent circuit, wherein each capacitance current sampling unit comprises a capacitor interface P10, a Schottky diode D7, a capacitor C16, a capacitor C17, a resistor R27, a resistor R28, a resistor R32, a resistor R34 and an operational amplifier U5A, the capacitor interface P10 is connected with an external capacitor, two ends of the Schottky diode D7 are respectively connected with two ends of a capacitor interface P10, the capacitor C16 and the resistor R32 are respectively connected with two ends of the Schottky diode D7 in parallel, one end of the resistor R32 is connected with one end of a resistor R27, the other end of the resistor R27 is respectively connected with an inverting input end of an operational amplifier U5A and one end of a resistor R34, a non-inverting input end of an operational amplifier U5A is connected with one end of a capacitor interface P10, an output end of an operational amplifier U5A is respectively connected with one end of a resistor R28 and the other end of a resistor R34, the other end of the resistor R28 is connected with one end of the capacitor C17, the other end of the capacitor C17 is grounded, and the other end of the resistor R28 outputs a capacitor sampling signal to the input end of the second MCU.
The capacitance current sampling circuit samples current signals on the capacitor, and realizes detection of the working state of the capacitor, so that the operation of the reactive compensation control system is more reliable.
Drawings
Fig. 1 is a schematic block diagram of an embodiment of the present invention.
FIG. 2 is a schematic diagram of a voltage sampling circuit according to an embodiment of the invention.
Fig. 3 is a schematic diagram of a current sampling circuit according to an embodiment of the present invention.
FIG. 4 is a schematic diagram of a metering chip circuit according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a first MCU and its peripheral circuits according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of a first communication circuit according to an embodiment of the invention.
Fig. 7 is a schematic diagram of a relay feedback circuit in accordance with an embodiment of the present invention.
Fig. 8 is a schematic diagram of a capacitive current sampling circuit according to an embodiment of the invention.
FIG. 9 is a schematic diagram of a second communication circuit according to an embodiment of the invention.
FIG. 10 is a schematic diagram of a voltage regulator circuit according to an embodiment of the invention.
Fig. 11 is a schematic diagram of a second MCU and its peripheral circuits according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, 5, 6, 9 and 11, the present invention is a low-cost reactive compensation control system, which comprises a plurality of intelligent reactive compensation devices and a shared device,
the sharing device comprises a switch power supply circuit, a voltage sampling circuit, a current sampling circuit, a metering chip, a first MCU, a first internal networking communication circuit and a first external communication circuit, wherein the model of the metering chip is RN8302, the model of the first MCU is HC32L130_ QFN32, the input end of the switch power supply circuit is connected with an external alternating current power supply, the output end of the switch power supply circuit outputs direct current working voltage to supply power for each circuit of the intelligent reactive power compensation device through an RJ45 interface and a network line, the input ends of the voltage sampling circuit and the current sampling circuit are respectively connected with an external three-phase alternating current power supply, the output ends of the voltage sampling circuit and the current sampling circuit are respectively connected with the input end of the metering chip, the metering chip is connected with the first MCU, the first internal networking communication circuit and the first external communication circuit are respectively connected with the first MCU,
the intelligent reactive power compensation device comprises a voltage stabilizing circuit, a second MCU, a relay driving circuit, a relay state detection and capacitor voltage zero-crossing detection feedback circuit, a capacitance current sampling circuit, a second internal networking communication circuit and a second external communication circuit, wherein the model of the second MCU is NUC029, the input end of the voltage stabilizing circuit is connected with the output end of a switching power supply circuit, the output end of the voltage stabilizing circuit outputs direct-current working voltage to supply power for each circuit of the intelligent reactive power compensation device, the input end of the capacitance current sampling circuit samples a capacitor current signal through a current transformer, the output end of the capacitance current sampling circuit is connected with the input end of the second MCU, the output end of the second MCU is connected with the input end of the relay driving circuit to control the action of the relay, and the signal end of the relay state detection and capacitor voltage zero-crossing detection feedback circuit is connected with the input end of the second MCU, the second internal networking communication circuit and the second external communication circuit are respectively connected with the second MCU,
the intelligent reactive power compensation device realizes communication of current, voltage and power factor sampling signals on the sharing device through connection of the first internal networking communication circuit and the second internal networking communication circuit, and the first internal networking communication circuit, the first external communication circuit, the second internal networking communication circuit and the second external communication circuit all adopt RS485 communication.
As shown in fig. 2-6, the voltage sampling circuit includes an a-phase voltage sampling unit, a B-phase voltage sampling unit, and a C-phase voltage sampling unit, which are connected in circuit, the a-phase voltage sampling unit includes a voltage transformer PT1, a resistor R21, a resistor R22, a resistor R33, a resistor R36, a capacitor C32, and a capacitor C35, two ends of a primary side of the voltage transformer PT1 are connected to an external a-phase power supply, the resistor R21 and the resistor R22 are connected in series on the primary side of the voltage transformer PT1, one end of the resistor R33 and one end of the capacitor C32 are respectively connected to one end of a secondary side of the voltage transformer PT1, one end of the resistor R36 and one end of the capacitor C35 are respectively connected to the other end of the secondary side of the voltage transformer PT1, the other end of the resistor R33, the other end of the capacitor C32, the other end of the resistor R36, and the other end of the capacitor C35 are connected in common, two ends of the secondary side of the voltage transformer PT1 output a-phase voltage sampling signal to an input terminal of the metering chip,
the current sampling circuit comprises a phase A current sampling unit, a phase B current sampling unit and a phase C current sampling unit which are connected with each other by circuits, the A-phase current sampling unit comprises a current transformer CT1, a resistor R27, a resistor R30, a resistor R39, a resistor R42, a capacitor C29 and a capacitor C38, two ends of the primary side of the current transformer CT1 are connected with an external A-phase power supply, one end of the secondary side of the current transformer CT1 is respectively connected with one end of a resistor R27 and one end of a resistor R30, the other end of the secondary side of the current transformer CT1 is respectively connected with one end of a resistor R39 and one end of a resistor R42, one end of the capacitor C29 is connected with the other end of the resistor R27, one end of the capacitor C38 is connected with the other end of the resistor R42, the other end of the resistor R30, the other end of the resistor R39, the other end of the capacitor C29 and the other end of the capacitor C38 are all grounded, the other end of the resistor R27 and the other end of the resistor R42 output A-phase current sampling signals to the input end of the metering chip.
As shown in fig. 7-11, the relay state detection and capacitor voltage zero-crossing detection feedback circuit includes a plurality of sets of relay feedback units in circuit connection, the relay feedback units include a resistor R3, a resistor R5, a photocoupler O2, and a photocoupler O3, one end of the resistor R5 and the positive electrode of the photocoupler O3 are connected to a relay, the other end of the resistor R5 is connected to the positive electrode of the photocoupler O2 and the negative electrode of the photocoupler O3, the negative electrode of the photocoupler O2 is connected to the positive electrode of the photocoupler O3, the emitter of the photocoupler O2 and the emitter of the photocoupler O3 are both grounded, the collector of the photocoupler O2 and the collector of the photocoupler O3 are connected to one end of a resistor R3, the other end of the resistor R3 is connected to a high level, one end of the resistor R3 outputs a relay feedback signal to the input end of the second MCU,
the capacitance current sampling circuit comprises a plurality of groups of capacitance current sampling units which are connected in a consistent circuit, the capacitance current sampling units comprise a capacitor interface P10, a Schottky diode D7, a capacitor C16, a capacitor C17, a resistor R27, a resistor R28, a resistor R32, a resistor R34 and an operational amplifier U5A, the capacitor interface P10 is connected with an external capacitor, two ends of the Schottky diode D7 are respectively connected with two ends of the capacitor interface P10, the capacitor C16 and the resistor R32 are respectively connected in parallel with two ends of the Schottky diode D7, one end of the resistor R32 is connected with one end of a resistor R27, the other end of the resistor R27 is respectively connected with an inverting input end of the operational amplifier U5A and one end of a resistor R34, a non-inverting input end of the operational amplifier U5A is connected with one end of the capacitor interface P10, an output end of the operational amplifier U5A is respectively connected with one end of a resistor R28 and the other end of the resistor R34, the other end of the resistor R28 is connected with one end of the capacitor C17, the other end of the capacitor C17 is grounded, and the other end of the resistor R28 outputs a capacitor sampling signal to the input end of the second MCU.
According to the embodiment, the reactive power compensation control system is provided with the sharing device, the sharing device comprises a switch power supply circuit, a voltage sampling circuit, a current sampling circuit and a metering chip, the output of direct current voltage, a voltage sampling signal after metering and a current sampling signal after metering can be respectively realized, the obtained direct current voltage obtains voltage for supplying power to the intelligent reactive power compensation device through a voltage stabilizing circuit on the intelligent reactive power compensation device, the sharing of the voltage sampling signal and the current sampling signal is realized through signal transmission of a first communication circuit and a second communication circuit, each intelligent reactive power compensation device obtains a power grid signal, a second MCU controls a relay driving circuit according to actual active power of a power grid, and the switching of a capacitor is realized for reactive power compensation.
The present invention may be embodied in many other forms without departing from the spirit or essential characteristics thereof, and it should be understood that various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A low-cost reactive compensation control system which characterized in that: comprises a plurality of intelligent reactive compensation devices and a shared device,
the shared device comprises a switch power supply circuit, a voltage sampling circuit, a current sampling circuit, a metering chip, a first MCU, a first internal networking communication circuit and a first external communication circuit, wherein the input end of the switch power supply circuit is connected with an external alternating current power supply, the output end of the switch power supply circuit outputs direct current working voltage to supply power for each circuit of the intelligent reactive power compensation device through an RJ45 interface and a network cable, the input ends of the voltage sampling circuit and the current sampling circuit are respectively connected with an external three-phase alternating current power supply, the output ends of the voltage sampling circuit and the current sampling circuit are respectively connected with the input end of the metering chip, the metering chip is connected with the first MCU, the first internal networking communication circuit and the first external communication circuit are respectively connected with the first MCU,
the intelligent reactive power compensation device comprises a voltage stabilizing circuit, a second MCU, a relay driving circuit, a relay state detection and capacitor voltage zero crossing detection feedback circuit, a capacitance current sampling circuit, a second internal networking communication circuit and a second external communication circuit, wherein the input end of the voltage stabilizing circuit is connected with the output end of a switching power supply circuit, the output end of the voltage stabilizing circuit outputs direct current working voltage to supply power for each circuit of the intelligent reactive power compensation device, the input end of the capacitance current sampling circuit samples a capacitor current signal through a current transformer, the output end of the capacitance current sampling circuit is connected with the input end of the second MCU, the output end of the second MCU is connected with the input end of the relay driving circuit to control the action of the relay, the signal end of the relay state detection and capacitor voltage zero crossing detection feedback circuit is connected with the input end of the second MCU, and the second internal networking communication circuit and the second external communication circuit are respectively connected with the second MCU,
the intelligent reactive power compensation device realizes the communication of current, voltage and power factor sampling signals on the sharing device through the connection of the first internal networking communication circuit and the second internal networking communication circuit.
2. The low-cost reactive compensation control system of claim 1, wherein: the voltage sampling circuit comprises an A phase voltage sampling unit, a B phase voltage sampling unit and a C phase voltage sampling unit which are connected in a circuit in a consistent way, the A-phase voltage sampling unit comprises a voltage transformer PT1, a resistor R21, a resistor R22, a resistor R33, a resistor R36, a capacitor C32 and a capacitor C35, two ends of the primary side of the voltage transformer PT1 are connected with an external A-phase power supply, a resistor R21 and a resistor R22 are connected in series on the primary side of the voltage transformer PT1, one end of the resistor R33 and one end of the capacitor C32 are respectively connected with one end of the secondary side of the voltage transformer PT1, one end of the resistor R36 and one end of the capacitor C35 are respectively connected with the other end of the secondary side of the voltage transformer PT1, the other end of the resistor R33, the other end of the capacitor C32, the other end of the resistor R36 and the other end of the capacitor C35 are connected in common, and the two ends of the secondary side of the voltage transformer PT1 output A-phase voltage sampling signals to the input end of the metering chip.
3. The low-cost reactive compensation control system of claim 1, wherein: the current sampling circuit comprises a phase A current sampling unit, a phase B current sampling unit and a phase C current sampling unit which are connected with each other by circuits, the A-phase current sampling unit comprises a current transformer CT1, a resistor R27, a resistor R30, a resistor R39, a resistor R42, a capacitor C29 and a capacitor C38, two ends of the primary side of the current transformer CT1 are connected with an external A-phase power supply, one end of the secondary side of the current transformer CT1 is respectively connected with one end of a resistor R27 and one end of a resistor R30, the other end of the secondary side of the current transformer CT1 is respectively connected with one end of a resistor R39 and one end of a resistor R42, one end of the capacitor C29 is connected with the other end of the resistor R27, one end of the capacitor C38 is connected with the other end of the resistor R42, the other end of the resistor R30, the other end of the resistor R39, the other end of the capacitor C29 and the other end of the capacitor C38 are all grounded, the other end of the resistor R27 and the other end of the resistor R42 output A-phase current sampling signals to the input end of the metering chip.
4. A low cost reactive compensation control system according to claim 1 or 2 or 3, characterized in that: the relay state detection and capacitor voltage zero-crossing detection feedback circuit comprises a plurality of groups of relay feedback units which are connected by circuits in a consistent mode, each relay feedback unit comprises a resistor R3, a resistor R5, a photoelectric coupler O2 and a photoelectric coupler O3, one end of the resistor R5 and the anode of the photoelectric coupler O3 are connected with a relay, the other end of the resistor R5 is connected with the anode of the photoelectric coupler O2 and the cathode of the photoelectric coupler O3 respectively, the cathode of the photoelectric coupler O2 is connected with the anode of the photoelectric coupler O3, the emitter of the photoelectric coupler O2 and the emitter of the photoelectric coupler O3 are grounded, the collector of the photoelectric coupler O2 and the collector of the photoelectric coupler O3 are connected with one end of the resistor R3 respectively, the other end of the resistor R3 is connected with a high level, and one end of the resistor R3 outputs a relay feedback signal to the input end of a second MCU.
5. A low cost reactive compensation control system according to claim 1 or 2 or 3, characterized in that: the capacitance current sampling circuit comprises a plurality of groups of capacitance current sampling units which are connected in a consistent circuit mode, the capacitance current sampling units comprise a capacitor interface P10, a Schottky diode D7, a capacitor C16, a capacitor C17, a resistor R27, a resistor R28, a resistor R32, a resistor R34 and an operational amplifier U5A, the capacitor interface P10 is connected with an external capacitor, two ends of the Schottky diode D7 are respectively connected with two ends of a capacitor interface P10, the capacitor C16 and the resistor R32 are respectively connected in parallel with two ends of the Schottky diode D7, one end of the resistor R32 is connected with one end of a resistor R27, the other end of the resistor R27 is respectively connected with an inverting input end of the operational amplifier U5A and one end of a resistor R34, a non-inverting input end of the operational amplifier U5A is connected with one end of a capacitor interface P10, an output end of the operational amplifier U5A is respectively connected with one end of a resistor R28 and the other end of a resistor R34, the other end of the resistor R28 is connected with one end of the capacitor C17, the other end of the capacitor C17 is grounded, and the other end of the resistor R28 outputs a capacitor sampling signal to the input end of the second MCU.
6. A low cost reactive compensation control system according to claim 1 or 2 or 3, characterized in that: and the first internal networking communication circuit, the first external communication circuit, the second internal networking communication circuit and the second external communication circuit are communicated by RS 485.
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