CN106356870B - A kind of reactive compensation adjuster, apparatus and system for distribution system - Google Patents
A kind of reactive compensation adjuster, apparatus and system for distribution system Download PDFInfo
- Publication number
- CN106356870B CN106356870B CN201610806626.0A CN201610806626A CN106356870B CN 106356870 B CN106356870 B CN 106356870B CN 201610806626 A CN201610806626 A CN 201610806626A CN 106356870 B CN106356870 B CN 106356870B
- Authority
- CN
- China
- Prior art keywords
- connect
- resistance
- pnp
- current
- capacitor
- 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.)
- Expired - Fee Related
Links
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
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
-
- 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
- H02J3/01—Arrangements for reducing harmonics or ripples
-
- 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
- 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
- Y02E40/40—Arrangements for reducing harmonics
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention discloses a kind of reactive compensation adjusters for distribution system, apparatus and system, including zero cross detection circuit, the zero cross detection circuit includes that the first common end is connect with power grid, 2 reverse parallel connections that second common end is connect with capacitor group it is single-phase silicon-controlled, rectifier bridge, first diode, second diode, first electric capacity of voltage regulation, second electric capacity of voltage regulation, clamp capacitor, first divider resistance, second divider resistance, first PNP, 2nd PNP, 3rd PNP, first current-limiting resistance, second current-limiting resistance, third current-limiting resistance, 4th current-limiting resistance, voltage-stabiliser tube, first discharge resistance, second discharge resistance and the first optocoupler, the output end of first optocoupler is connect as the output end of zero cross detection circuit with single-chip microcontroller.The generation for the case where malfunction that the application effectively prevents the first optocoupler causes capacitor group not to be put into power grid in zero crossing, improves security performance.
Description
Technical field
The present invention relates to reactive power compensation technology fields, adjust more particularly to a kind of reactive compensation for distribution system
Device, apparatus and system.
Background technique
At present in low-voltage network, because of TSC (Thyristor switched capacitor, thyristor series capacitor
Device) it is cheap, easy to maintenance, be easy to dilatation, the advantages that occupied area is small, is largely used as low-pressure reactive compensation dress
It sets.Low-voltage reactive compensator includes master controller, reactive compensation adjuster and capacitor group, wherein reactive compensation is adjusted
Device includes a single-chip microcontroller and the one-to-one 3 groups of zero cross detection circuits of three-phase circuit and thyristor driving circuit, list
Piece machine works as zero cross detection circuit and detects network voltage zero passage in the capacitor investment order for receiving master controller transmission
When, the investment of capacitor group is realized in the conducting that single-chip microcontroller controls thyristor driving circuit.
Specifically, Fig. 1 is please referred to, Fig. 1 is one group of zero passage detection in a kind of reactive compensation adjuster in the prior art
The structural schematic diagram of circuit and thyristor driving circuit, the circuit mainly include 2 current-limiting resistances R1 and R2, and 2 series connection make
Bidirectional thyristor driver MOC3083,2 equalizing resistances R3 and R4, RC absorbing circuit and 2 the single-phase of reverse parallel connection can
Control silicon.Bidirectional thyristor driver MOC3083 input with output by Phototube Coupling, inside be integrated with zero passage detection electricity
Road, therefore it is able to achieve zero passage investment capacitor under normal circumstances.Although but bidirectional thyristor driver MOC3083 is normal in power grid
Theoretical condition under accurately can put into capacitor group in zero crossing triggering thyristor, but in practical power distribution network, due to electricity
Net harmonic wave complexity is indefinite, and especially when network voltage is distorted, optocoupler is easy malfunction.So that capacitor group may not
It is put into power grid in zero crossing, causes inrush current excessive, is easily damaged thyristor, or even can find some capacitors at the scene
Phenomena such as device group is directly exploded.
Therefore, how to provide a kind of scheme of solution above-mentioned technical problem is that those skilled in the art need to solve at present
Problem.
Summary of the invention
The object of the present invention is to provide a kind of reactive compensation adjusters for distribution system, effectively prevent the first optocoupler
Malfunction the case where causing capacitor group not to be put into power grid in zero crossing generation, improve security performance；Of the invention
Another object is to provide a kind of reactive power compensator and system including the above-mentioned reactive compensation adjuster for distribution system.
In order to solve the above technical problems, the present invention provides a kind of reactive compensation adjuster for distribution system, application
In reactive power compensator, the reactive power compensator further includes master controller and capacitor group, the reactive compensation adjuster packet
Include single-chip microcontroller and the one-to-one 3 groups of zero cross detection circuits of three-phase circuit and thyristor driving circuit, wherein every group
In the zero cross detection circuit include:
2 reverse parallel connections that first common end is connect with power grid, the second common end is connect with capacitor group it is single-phase controllable
Silicon；
First input end is connect by the first current-limiting resistance with first common end, the second input terminal passes through the second current limliting
The rectifier bridge that resistance is connect with second common end, the output plus terminal of the rectifier bridge respectively with the anode of first diode and
The anode of second diode connects, and the output negative terminal of the rectifier bridge is divided with the first end of the first electric capacity of voltage regulation, first respectively
The first end of resistance, the collector of the first PNP, the first end of third current-limiting resistance, the first end of the second electric capacity of voltage regulation and steady
The anode of pressure pipe connects；
The cathode of the first diode respectively with the second end of first electric capacity of voltage regulation, the second divider resistance first
The base stage at end, the emitter of the first PNP, the first end of the first discharge resistance and the 2nd PNP connects, second partial pressure
The second end of resistance is connect with the second end of first divider resistance, and the first end of common end and the 4th current-limiting resistance connects
It connects, the second end of the 4th current-limiting resistance is connect with the first end of the base stage of the first PNP and clamp capacitor respectively, institute
The collector for stating the 2nd PNP is connect with the first luminous end of the first end of the second discharge resistance and the first optocoupler respectively, described
The emitter of 2nd PNP is connect with the base stage of the 3rd PNP, the emitter of the 3rd PNP respectively with second diode
Cathode, the second end of the clamp capacitor, the second end of first discharge resistance, the second end of second electric capacity of voltage regulation with
And the cathode connection of the voltage-stabiliser tube, the second luminous end of first optocoupler second end with second discharge resistance respectively
And the second end connection of third current-limiting resistance, output end of the output end of first optocoupler as the zero cross detection circuit
It is connect with the single-chip microcontroller, provides zero passage detection signal for the single-chip microcontroller, so that the single-chip microcontroller is according to the master controller
The capacitor of transmission puts into order and the zero passage detection signal to control the conducting of corresponding thyristor driving circuit, realizes
The investment of corresponding capacitor group.
Preferably, the thyristor driving circuit in every group includes:
First end connect with the output end of the single-chip microcontroller, second end with respectively with the first end of second resistance and first
The emitter ground connection of the first resistor of the base stage connection of NPN, the second end of the second resistance and the first NPN are described
The collector of first NPN is connect with the cathode of the first end of 3rd resistor and third diode respectively, the third diode
Anode connect respectively with the first end of the 4th resistance, the anode of the 4th diode and the base stage of the 2nd NPN, third electricity
The second end of resistance is connect with the base stage of the cathode of the 4th diode and the 4th PNP respectively, the collector of the 4th PNP
Ground connection, the emitter of the 4th PNP are connect with the emitter of the 2nd NPN, and common end passes through the 4th capacitor and driving
The first input end of the primary coil of transformer connects, the second input terminal of primary coil current collection with the 2nd NPN respectively
The connection of the second end of pole and the 4th resistance, public termination power；First secondary coil of the driving transformer
First output end is connect by the first rectifier diode with the first end of the 5th current-limiting resistance, and the second of the 5th current-limiting resistance
Hold with 2 reverse parallel connections it is single-phase silicon-controlled in a silicon-controlled control terminal connect, first secondary coil
Second output terminal is connect with first common end；First output end of the second subprime coil passes through the second rectifier diode
It is connect with the first end of the 6th current-limiting resistance, the second end of the 6th current-limiting resistance and 2 the single-phase of reverse parallel connection can
Control another silicon-controlled control terminal connection in silicon, the second output terminal of the second subprime coil and second common end
Connection, wherein the second input terminal of the primary coil, the first output end of first secondary coil and described second
Second output of grade coil is broken as the Same Name of Ends of the driving transformer.
Preferably, the power supply is 12V.
Preferably, the rectifier bridge is full-wave rectification bridge.
In order to solve the above technical problems, the present invention also provides a kind of reactive power compensator, including master controller and N number of electricity
Container group, further include with the one-to-one N number of reactive compensation adjuster as described above of N number of capacitor group, N is positive whole
Number, in which:
It is current that the master controller is used to obtaining power grid according to the collected network voltage of acquisition device and power network current
Active power, reactive power and power factor (PF), and power grid is judged according to the active power, reactive power and power factor (PF)
Whether need to carry out reactive compensation at this time, if it is, generating capacitor investment order, and the capacitor is put into order hair
It send to the single-chip microcontroller of the corresponding reactive compensation adjuster.
Preferably, the capacitor group includes mending capacitor group altogether and dividing benefit capacitor.
Preferably, which further includes be set between the master controller and N number of reactive compensation adjuster
Two optocouplers.
In order to solve the above technical problems, the present invention also provides a kind of reactive compensation system, including nothing as described above
Reactive power compensation installations, further includes:
Voltage transformer, for acquiring the network voltage；
Current transformer, for acquiring the power network current；
The N group air switch that first end is connect with the reactive compensation adjuster correspondingly respectively, the N group air
The second end of switch is connect with common bus；
The common bus is connect by main breaker with the power grid.
Preferably, fuse is additionally provided between the common bus and the main breaker.
The present invention provides a kind of reactive compensation adjuster, apparatus and systems for distribution system, including zero passage detection
Circuit, the zero cross detection circuit include 2 that the first common end is connect with power grid, the second common end is connect with capacitor group reversed
Single-phase silicon-controlled, rectifier bridge, first diode, the second diode, the first electric capacity of voltage regulation, the second electric capacity of voltage regulation, clamper in parallel
Capacitor, the first divider resistance, the second divider resistance, the first PNP, the 2nd PNP, the 3rd PNP, the first current-limiting resistance, the second current limliting
Resistance, third current-limiting resistance, the 4th current-limiting resistance, voltage-stabiliser tube, the first discharge resistance, the second discharge resistance and the first optocoupler,
The output end of first optocoupler is connect as the output end of zero cross detection circuit with single-chip microcontroller, provides zero passage detection letter for single-chip microcontroller
Number, the capacitor investment order that sends so as to single-chip microcontroller according to master controller and zero passage detection signal control corresponding brilliant lock
The investment of corresponding capacitor group is realized in the conducting of tube drive circuit.Zero cross detection circuit provided by the present application is by circuit
The devices such as electric capacity of voltage regulation, clamp capacitor, discharge resistance, current-limiting resistance and voltage-stabiliser tube are set reduce harmonic wave in power grid and
The influence that power grid distorts to zero cross detection circuit, so that the malfunction for effectively preventing the first optocoupler causes capacitor group not in zero passage
The generation for the case where being put into power grid when point, improves security performance.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is one group of zero cross detection circuit and thyristor driver in a kind of reactive compensation adjuster in the prior art
The structural schematic diagram of circuit；
Fig. 2 is a kind of structural schematic diagram of the reactive compensation adjuster for distribution system provided by the invention；
Fig. 3 is the A phase zero passage detection in a kind of reactive compensation adjuster for distribution system provided in Fig. 2 of the present invention
The circuit diagram of circuit；
Fig. 4 is a kind of circuit diagram of A phase thyristor driving circuit provided by the invention；
Fig. 5 is a kind of equivalent circuit of the A phase thyristor driving circuit provided by the invention when the PWM of input is high level
Figure；
Fig. 6 is a kind of equivalent circuit of the A phase thyristor driving circuit provided by the invention when the PWM of input is low level
Figure；
Fig. 7 is a kind of circuit diagram of reactive compensation system provided by the invention.
Specific embodiment
Core of the invention is to provide a kind of reactive compensation adjuster for distribution system, effectively prevents the first optocoupler
Malfunction the case where causing capacitor group not to be put into power grid in zero crossing generation, improve security performance；Of the invention
Another core is to provide a kind of reactive power compensator and system including the above-mentioned reactive compensation adjuster for distribution system.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Referring to figure 2. and Fig. 3, wherein Fig. 2 is a kind of reactive compensation adjuster for distribution system provided by the invention
Structural schematic diagram, Fig. 3 is the A phase mistake in Fig. 2 of the present invention in a kind of reactive compensation adjuster for distribution system for providing
The circuit diagram of zero detection circuit；
For the reactive compensation regulator applications in reactive power compensator, reactive power compensator further includes master controller and capacitor
Group, reactive compensation adjuster include single-chip microcontroller and the one-to-one 3 groups of zero cross detection circuits of three-phase circuit and thyristor
Driving circuit, wherein the zero cross detection circuit in every group includes:
2 reverse parallel connections that first common end is connect with power grid, the second common end is connect with capacitor group it is single-phase controllable
Silicon；
First input end is connect by the first current-limiting resistance R1 with the first common end, the second input terminal passes through the second current limliting electricity
The resistance rectifier bridge B1 that is connect with the second common end of R2, the output plus terminal of rectifier bridge B1 respectively with the anode of first diode D1 and the
The anode of two diode D2 connects, and the output negative terminal of rectifier bridge B1 is divided with the first end of the first electric capacity of voltage regulation C1, first respectively
The first end of resistance R3, the collector of the first PNP Q1, the first end of third current-limiting resistance R7, the second electric capacity of voltage regulation C3 first
The connection of the anode of end and voltage-stabiliser tube D3；
The cathode of first diode D1 respectively with the second end of the first electric capacity of voltage regulation C1, the second divider resistance R4 first
The base stage at end, the emitter of the first PNP Q1, the first end of the first discharge resistance R6 and the 2nd PNP Q2 connects, the second partial pressure
The second end of resistance R4 is connect with the second end of the first divider resistance R3, and the first end of common end and the 4th current-limiting resistance R5 connect
It connecing, the second end of the 4th current-limiting resistance R5 is connect with the first end of the base stage of the first PNP Q1 and clamp capacitor C2 respectively, the
The collector of two PNP Q2 is connect with the first luminous end of the first end of the second discharge resistance R8 and the first optocoupler respectively, and second
The emitter of PNP Q2 is connect with the base stage of the 3rd PNP Q3, the emitter of the 3rd PNP Q3 yin with the second diode D2 respectively
Pole, the second end of clamp capacitor C2, the second end of the first discharge resistance R6, the second end and voltage-stabiliser tube of the second electric capacity of voltage regulation C3
The cathode of D3 connects, the second luminous end of the first optocoupler respectively with the second end and third current-limiting resistance of the second discharge resistance R8
The second end of R7 connects, and the output end of the first optocoupler is connect as the output end of zero cross detection circuit with single-chip microcontroller, is single-chip microcontroller
Zero passage detection signal is provided, the order of capacitor investment and zero passage detection signal so as to single-chip microcontroller according to master controller transmission come
The investment of corresponding capacitor group is realized in the conducting for controlling corresponding thyristor driving circuit.
Specifically, zero cross detection circuit connects at the single-phase silicon-controlled both ends of 2 reverse parallel connections, and is provided with the first current limliting electricity
Hinder R1 and the second current-limiting resistance R2, main working process is: rectifier bridge B1 is by the electricity at the single-phase silicon-controlled both ends of 2 reverse parallel connections
Pressure rectified, then by first diode D1 and the second diode D2 respectively to circuit power, the first electric capacity of voltage regulation C1 and
Second electric capacity of voltage regulation C3 pressure stabilizing under the action of voltage-stabiliser tube D3.Selecting a point is reference point, it is assumed that first diode D1 and the two or two pole
The tube voltage drop of pipe D2 is 0.7V, then knows that the current potential of c and d is identical, and the current potential hypothesis of c and d gradually decreases to unidirectionally controllably
The both ends of silicon are close to zero crossing, while b point is divided by the first divider resistance R3 and the second divider resistance R4, so that bc two
When current potential differs 0.7V between point, meet the turn-on condition of the first PNP Q1, the first PNP Q1 saturation conduction, so that the 2nd PNP Q2
Base earth, will quickly promote multiple tube the 2nd PNP Q2 and the 3rd PNP Q3 saturation to lead after the base earth of the 2nd PNP Q2
Logical, the luminous end of the first optocoupler will flow through electric current, and the conducting of the first optocoupler drags down output voltage, and single-chip microcontroller obtains low level letter
Number indicate one-way SCR both end voltage zero crossing at this time.
In addition, it is necessary to explanation, the effect of clamp capacitor C2 is clamper, and the first PNP Q1 is avoided to mislead, the 4th limit
Leakage resistance R5 plays the role of the current limliting of the base current to the first PNP Q1, and the first discharge resistance R6's acts on multiple tube
When two PNP Q2 and the 3rd PNP Q3 are turned off, since there are interpolar electricity for the base stage and the emitter of the 3rd PNP Q3 of the 2nd PNP Q2
Hold effect, repid discharge is carried out to residual voltage.Current-limiting resistance when third current-limiting resistance R7 is the conducting of the first optocoupler, second puts
The effect of resistance R8 be the luminous survey of the first optocoupler after shut-off, there are capacity effect, repid discharge is carried out to residual voltage.
When detecting the both ends zero crossing of the first common end and the second common end, the conducting of the first optocoupler drags down output end level, by
In the little reason of the energy storage by capacitor, this energy meeting quick release, so as to accomplish the low level pulsewidth of output end
It is very small.R9 is pull-up resistor, and general 2k is enough, because if resistance will lead to greatly very much the rising edge steepness of low-level pulse width
Greatly, the slower time is needed to retract high level.
In addition, Fig. 3 give be A phase zero cross detection circuit schematic diagram, the principle of the zero cross detection circuit of B phase and C phase
Scheme identical as Fig. 3.
Preferably, rectifier bridge B1 is full-wave rectification bridge B1.
Certainly, rectifier bridge B1 here can also be other kinds of rectifier bridge B1, and the present invention does not do special limit herein
It is fixed, it is able to achieve the purpose of the present invention.
Preferably, the thyristor driving circuit in every group includes:
The output end of first end and single-chip microcontroller connection, second end with respectively with the first end of second resistance R11 and first
The emitter ground connection of the first resistor R10 of the base stage connection of NPN Q4, the second end of second resistance R11 and the first NPN Q4,
The collector of first NPN Q4 is connect with the cathode of the first end of 3rd resistor R12 and third diode D4 respectively, and the three or two
The anode of pole pipe D4 respectively with the first end of the 4th resistance R13, the anode of the 4th diode D5 and the base stage of the 2nd NPN Q5
Connection, the second end of 3rd resistor R12 are connect with the base stage of the cathode of the 4th diode D5 and the 4th PNP Q6 respectively, and the 4th
The emitter of the grounded collector of PNP Q6, the 4th PNP Q6 is connect with the emitter of the 2nd NPN Q5, and common end passes through the
The first input end of the primary coil of four capacitor C4 and driving transformer connects, and the second input terminal of primary coil is respectively with second
The connection of the second end of the collector of NPN Q5 and the 4th resistance R13, public termination power；First grade of driving transformer
First output end of coil is connect by the first rectifier diode D6 with the first end of the 5th current-limiting resistance R14, the 5th current limliting electricity
It hinders the second end of R14 to connect with a silicon-controlled control terminal in the single-phase silicon-controlled of 2 reverse parallel connections, the first secondary coil
Second output terminal connect with the first common end；First output end of second subprime coil passes through the second rectifier diode D7 and the
The first end of six current-limiting resistance R15 connects, the second end of the 6th current-limiting resistance R15 and 2 reverse parallel connections it is single-phase silicon-controlled in
The connection of another silicon-controlled control terminal, the second output terminal of second subprime coil connect with the second common end, wherein primary
Second output of the second input terminal of coil, the first output end of the first secondary coil and second subprime coil is broken to be become for driving
The Same Name of Ends of depressor.
Preferably, power supply 12V.
Specifically, referring to figure 4., Fig. 4 is a kind of circuit diagram of A phase thyristor driving circuit provided by the invention.
It is understood that single-chip microcontroller is ordered in the capacitor investment for receiving master controller transmission, and work as zero passage detection
When circuit detects network voltage zero passage, single-chip microcontroller can be according to the order of capacitor investment and zero passage detection that master controller is sent
Signal generates pwm signal to control the conducting of corresponding thyristor driving circuit.
When the PWM of input is high level, i.e. the first NPN Q4 is connected, equivalent circuit such as Fig. 5, Fig. 5 provide for the present invention
A kind of A phase thyristor driving circuit input PWM be high level when equivalent circuit diagram, in powered on moment, the 4th capacitor
The both end voltage of C4 cannot be mutated, no current in primary resistance very little, that is, primary coil of driving transformer.4th PNP at this time
The emitter of Q6 is 12V over the ground.Third diode D4 and the 4th equal forward conduction of diode D5, conduction voltage drop 0.7V, therefore the
The base potential of four PNP Q6 is 0, and the base potential of the 4th PNP Q6 is less than emitter potential, and the emitter of the 4th PNP Q6
Above earth potential is negative voltage, meets the turn-on condition of the 4th PNP Q6, the 4th PNP Q6 saturation conduction, the current collection of the 2nd NPN Q5
Pole and transmitting interpolar are unable to satisfy the turn-on condition of the 2nd NPN Q5 triode, to the 4th capacitor C4 because of powered on moment no-voltage
After charging is full, there is voltage difference between the collector and emitter of the 2nd NPN Q5, meet one of condition of conducting, even if the
Four capacitor C4 are charged full, and the 2nd NPN Q5 still can not be connected, this is because the tube voltage drop of the 4th diode D5 is 0.7V,
The Ube of 2nd NPN Q5 is equal to the tube voltage drop 0.7V of the 4th PNP Q6 plus the Ucb of the 4th PNP Q6, due to the 4th PNP Q6's
Ucb is greater than 0, i.e. the Ube of the 2nd NPN Q5 is less than 0.7V, so that the 2nd NPN Q5 is blocked and can not be connected, current direction is such as
Q2Ic, power supply are charged by driving transformer to the 4th capacitor C4.It is available, when the first NPN Q4 conducting, the 4th capacitor C4
In charged state.
When the first NPN Q4 cut-off, equivalent circuit such as Fig. 6, Fig. 6 are a kind of A phase thyristor driver electricity provided by the invention
Equivalent circuit diagram of the road when the PWM of input is low level.The base potential of the 4th PNP Q6 suspends at this time, and the 4th PNP Q6 is cut
Only, so that the Ucb=0 of the 4th PNP Q6, and then the base potential of the 2nd NPN Q5 is the 4th diode D5 to emitter potential
Tube voltage drop 0.7V, a current potential left side of the 4th capacitor C4 is negative right just at this time, i.e., the electricity between the collector and emitter of the 2nd NPN Q5
Pressure is positive voltage, meets the turn-on condition of the 2nd NPN Q5, the 2nd NPN Q5 saturation conduction, and the 4th capacitor C4 passes through the 2nd NPN
Q5 discharges to the primary coil of driving transformer, current direction such as Q1Ic, can be obtained, when PWM is low level, the 4th capacitor C4
In discharge condition.
Charge and discharge process so, so that it may in secondary side induced voltage, silicon-controlled gate drive current is supplied after rectification.
The present invention provides a kind of reactive compensation adjuster for distribution system, including zero cross detection circuit, the zero passages
Detection circuit includes the single-phase of 2 reverse parallel connections that the first common end is connect with power grid, the second common end is connect with capacitor group
Silicon-controlled, rectifier bridge, first diode, the second diode, the first electric capacity of voltage regulation, the second electric capacity of voltage regulation, clamp capacitor, first point
Piezoresistance, the second divider resistance, the first PNP, the 2nd PNP, the 3rd PNP, the first current-limiting resistance, the second current-limiting resistance, third limit
Leakage resistance, the 4th current-limiting resistance, voltage-stabiliser tube, the first discharge resistance, the second discharge resistance and the first optocoupler, the first optocoupler it is defeated
Outlet is connect as the output end of zero cross detection circuit with single-chip microcontroller, zero passage detection signal is provided for single-chip microcontroller, so as to single-chip microcontroller
Capacitor according to master controller transmission puts into order and zero passage detection signal to control corresponding thyristor driving circuit
Conducting, realizes the investment of corresponding capacitor group.Zero cross detection circuit provided by the present application by circuit be arranged electric capacity of voltage regulation,
The devices such as clamp capacitor, discharge resistance, current-limiting resistance and voltage-stabiliser tube distort to reduce harmonic wave in power grid and power grid to mistake
The influence of zero detection circuit, so that the malfunction for effectively preventing the first optocoupler causes capacitor group not to be put into electricity in zero crossing
The generation of the case where net, improves security performance.
The present invention also provides a kind of reactive power compensator, including master controller and N number of capacitor group, further include with it is N number of
The one-to-one N number of such as above-mentioned reactive compensation adjuster of capacitor group, N is positive integer, in which:
Master controller is used to obtain current active of power grid according to the collected network voltage of acquisition device and power network current
Power, reactive power and power factor (PF), and according to active power, reactive power and power factor (PF) judge power grid at this time whether
It needs to carry out reactive compensation, if it is, generating capacitor investment order, and capacitor investment order is sent to corresponding nothing
The single-chip microcontroller of function compensated regulator.
Preferably, capacitor group includes mending capacitor group altogether and dividing benefit capacitor.
Preferably, which further includes the second light being set between master controller and N number of reactive compensation adjuster
Coupling.
Master controller from reactive compensation adjuster due to using different power supplys, two power supplys pass through the second optocoupler
Isolation.
Above-mentioned adjuster is please referred to for the introduction of the reactive compensation adjuster in reactive power compensator provided by the present application
Embodiment, details are not described herein by the present invention.
Fig. 7 is please referred to, Fig. 7 is a kind of circuit diagram of reactive compensation system provided by the invention；The reactive compensation system
System includes such as above-mentioned reactive power compensator, further includes:
Voltage transformer, for acquiring network voltage；
Current transformer, for acquiring power network current；
The first end N group air switch that is connect correspondingly with reactive compensation adjuster respectively, the of N group air switch
Two ends are connect with common bus；
Common bus is connect by main breaker with power grid.
Preferably, fuse is additionally provided between common bus and main breaker.
It is understood that reactive compensation system provided by the present application, which also additionally increases fuse, reinforces overcurrent protection, separately
Outside, it is separately protected to be provided with an air switch for each capacitor group.
For thunder and lightning hotspot, arrester should be increased, prevent thunder and lightning traveling wave or switching overvoltage from causing to capacitor group
It damages.
Above-mentioned adjuster is please referred to for the introduction of the reactive compensation adjuster in reactive power compensator provided by the present application
Embodiment, details are not described herein by the present invention.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.It should also be noted that, in this theory
In bright book, relational terms such as first and second and the like be used merely to by an entity or operation with another entity or
Operation distinguishes, without necessarily requiring or implying between these entities or operation there are any this actual relationship or
Sequentially.Moreover, the terms "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that
Process, method, article or equipment including a series of elements not only includes those elements, but also including being not explicitly listed
Other element, or further include for elements inherent to such a process, method, article, or device.Do not limiting more
In the case where system, the element that is limited by sentence "including a ...", it is not excluded that include the element process, method,
There is also other identical elements in article or equipment.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (8)
1. a kind of reactive compensation adjuster for distribution system is applied to reactive power compensator, the reactive power compensator is also
Including master controller and capacitor group, which is characterized in that the reactive compensation adjuster includes single-chip microcontroller and three-phase circuit
One-to-one 3 groups of zero cross detection circuits and thyristor driving circuit, wherein the zero cross detection circuit packet in every group
It includes:
2 reverse parallel connections that first common end is connect with power grid, the second common end is connect with capacitor group it is single-phase silicon-controlled；
First input end is connect by the first current-limiting resistance with first common end, the second input terminal passes through the second current-limiting resistance
The rectifier bridge being connect with second common end, the output plus terminal of the rectifier bridge respectively with the anode of first diode and second
The anode of diode connects, the output negative terminal of the rectifier bridge respectively with the first end of the first electric capacity of voltage regulation, the first divider resistance
First end, the collector of the first PNP, the first end of third current-limiting resistance, the first end and voltage-stabiliser tube of the second electric capacity of voltage regulation
Anode connection；
The cathode of the first diode respectively with the second end of first electric capacity of voltage regulation, the first end of the second divider resistance,
The base stage of the emitter of first PNP, the first end of the first discharge resistance and the 2nd PNP connects, the second partial pressure electricity
The second end of resistance is connect with the second end of first divider resistance, the second end of second divider resistance with described first point
The common end of the second end connection of piezoresistance is connect with the first end of the 4th current-limiting resistance, the second end of the 4th current-limiting resistance
Connect respectively with the first end of the base stage of the first PNP and clamp capacitor, the collector of the 2nd PNP respectively with third
First luminous end of the collector of PNP, the first end of the second discharge resistance and the first optocoupler connects, the hair of the 2nd PNP
Emitter-base bandgap grading is connect with the base stage of the 3rd PNP, the emitter of the 3rd PNP respectively with the cathode of second diode, the pincers
Second end, the second end of first discharge resistance, the second end and the pressure stabilizing of second electric capacity of voltage regulation of position capacitor
The cathode of pipe connects, and the second luminous end of first optocoupler is limited with the second end of second discharge resistance and third respectively
The second end of leakage resistance connects, the emitter ground connection of Shouguang device of first optocoupler, the collection of the light-receiving device of first optocoupler
Electrode is connect as the output end of the zero cross detection circuit with the single-chip microcontroller, provides zero passage detection letter for the single-chip microcontroller
Number, the capacitor investment order that sends so as to the single-chip microcontroller according to the master controller and the zero passage detection signal are controlled
The investment of corresponding capacitor group is realized in the conducting for making corresponding thyristor driving circuit；
The thyristor driving circuit in every group includes:
First end connect with the output end of the single-chip microcontroller, second end with respectively with the first end of second resistance and the first NPN
Base stage connection first resistor, the emitter ground connection of the second end of the second resistance and the first NPN, described first
The collector of NPN is connect with the cathode of the first end of 3rd resistor and third diode respectively, the sun of the third diode
Pole is connect with the first end of the 4th resistance, the anode of the 4th diode and the base stage of the 2nd NPN respectively, the 3rd resistor
Second end is connect with the base stage of the cathode of the 4th diode and the 4th PNP respectively, and the collector of the 4th PNP connects
The emitter on ground, the 4th PNP is connect with the emitter of the 2nd NPN, the emitter and described second of the 4th PNP
The common end of the emitter connection of NPN is connected by the first input end of the 4th capacitor and the primary coil of driving transformer, institute
The second input terminal for stating primary coil is connect with the second end of the collector of the 2nd NPN and the 4th resistance respectively, described
The public termination electricity that second input terminal of primary coil is connect with the second end of the collector of the 2nd NPN and the 4th resistance
Source；First output end of the first secondary coil of the driving transformer passes through the first rectifier diode and the 5th current-limiting resistance
First end connection, the second end of the 5th current-limiting resistance and 2 reverse parallel connections it is single-phase silicon-controlled in one it is controllable
The control terminal of silicon connects, and the second output terminal of first secondary coil is connect with first common end；Second subprime coil
The first output end connect with the first end of the 6th current-limiting resistance by the second rectifier diode, the of the 6th current-limiting resistance
Two ends and 2 reverse parallel connections it is single-phase silicon-controlled in another silicon-controlled control terminal connect, the second subprime line
The second output terminal of circle is connect with second common end, wherein the second input terminal of the primary coil, first grade
Second output of the first output end of coil and the second subprime coil is broken as the Same Name of Ends of the driving transformer.
2. reactive compensation adjuster as described in claim 1, which is characterized in that the power supply is 12V.
3. reactive compensation adjuster as described in claim 1, which is characterized in that the rectifier bridge is full-wave rectification bridge.
4. a kind of reactive power compensator, which is characterized in that including master controller and N number of capacitor group, further include and N number of electricity
The one-to-one N number of reactive compensation adjuster as described in any one of claims 1-3 of container group, N is positive integer, in which:
The master controller is used to obtain current active of power grid according to the collected network voltage of acquisition device and power network current
Power, reactive power and power factor (PF), and judge power grid at this time according to the active power, reactive power and power factor (PF)
Whether need to carry out reactive compensation, if it is, generating capacitor investment order, and capacitor investment order is sent to
The single-chip microcontroller of the corresponding reactive compensation adjuster.
5. reactive power compensator as claimed in claim 4, which is characterized in that the capacitor group include altogether mend capacitor group and
Divide benefit capacitor.
6. reactive power compensator as claimed in claim 5, which is characterized in that the device further includes being set to the master controller
With the second optocoupler between N number of reactive compensation adjuster.
7. a kind of reactive compensation system, which is characterized in that including such as described in any item reactive power compensators of claim 4-6,
Further include:
Voltage transformer, for acquiring the network voltage；
Current transformer, for acquiring the power network current；
The N group air switch that first end is connect with the reactive compensation adjuster correspondingly respectively, the N group air switch
Second end connect with common bus；
The common bus is connect by main breaker with the power grid.
8. reactive compensation system as claimed in claim 7, which is characterized in that between the common bus and the main breaker
It is additionally provided with fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610806626.0A CN106356870B (en) | 2016-09-06 | 2016-09-06 | A kind of reactive compensation adjuster, apparatus and system for distribution system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610806626.0A CN106356870B (en) | 2016-09-06 | 2016-09-06 | A kind of reactive compensation adjuster, apparatus and system for distribution system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106356870A CN106356870A (en) | 2017-01-25 |
| CN106356870B true CN106356870B (en) | 2019-01-01 |
Family
ID=57859735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610806626.0A Expired - Fee Related CN106356870B (en) | 2016-09-06 | 2016-09-06 | A kind of reactive compensation adjuster, apparatus and system for distribution system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106356870B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350807A (en) * | 2018-04-08 | 2019-10-18 | 佛山科学技术学院 | A kind of rectification module for UPS |
| CN110492877A (en) * | 2018-05-15 | 2019-11-22 | 维谛公司 | A kind of thyristor driving circuit |
| CN109728587A (en) * | 2018-11-20 | 2019-05-07 | 哈尔滨理工大学 | A kind of follow-on TSC reactive compensation adjuster |
| CN110535139B (en) * | 2019-10-15 | 2023-12-12 | 国网青海省电力公司果洛供电公司 | Broad width pressure regulating device |
| CN111766449A (en) * | 2020-06-18 | 2020-10-13 | 浙江嘉宏电力科技有限公司 | Short circuit impedance detection system and detection method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699694A (en) * | 2009-10-29 | 2010-04-28 | 山东山大华天科技股份有限公司 | Three-phase three-wire dynamic split-phase reactive power compensation device and control method thereof |
| CN203287421U (en) * | 2013-05-31 | 2013-11-13 | 浙江工业大学 | three-phase alternating voltage and current measuring circuit |
| CN205212438U (en) * | 2015-10-29 | 2016-05-04 | 江苏矽莱克电子科技有限公司 | High -efficient uncompensated on -off switch |
| CN106169765A (en) * | 2016-08-04 | 2016-11-30 | 广东工业大学 | A kind of NEW TYPE OF COMPOSITE for Reactive Power Compensation of Power Distribution System switchs |
-
2016
- 2016-09-06 CN CN201610806626.0A patent/CN106356870B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699694A (en) * | 2009-10-29 | 2010-04-28 | 山东山大华天科技股份有限公司 | Three-phase three-wire dynamic split-phase reactive power compensation device and control method thereof |
| CN203287421U (en) * | 2013-05-31 | 2013-11-13 | 浙江工业大学 | three-phase alternating voltage and current measuring circuit |
| CN205212438U (en) * | 2015-10-29 | 2016-05-04 | 江苏矽莱克电子科技有限公司 | High -efficient uncompensated on -off switch |
| CN106169765A (en) * | 2016-08-04 | 2016-11-30 | 广东工业大学 | A kind of NEW TYPE OF COMPOSITE for Reactive Power Compensation of Power Distribution System switchs |
Non-Patent Citations (2)
| Title |
|---|
| 改进式晶闸管电容无功补偿方法的研究;王建元等;《东北电力大学学报》;20150228;第35卷(第1期);第37页-第41页 |
| 谈晶闸管投切电容器TSC的触发电路;王忠清等;《电力电容器》;20070831;第28卷(第4期);第30页-第35页 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106356870A (en) | 2017-01-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106356870B (en) | A kind of reactive compensation adjuster, apparatus and system for distribution system | |
| CN203026918U (en) | Input over-voltage protection circuit of smart grid terminal power supply | |
| CN102170178B (en) | High-voltage transmission line current coupling electricity-getting device | |
| WO2011095016A1 (en) | Voltage limitation circuit for power switch devices connected in series | |
| CN106451700B (en) | A kind of circuit protection device and wireless charging system | |
| CN103474965A (en) | Low-cost alternating-current input overvoltage protection circuit and switching power supply | |
| CN104753328A (en) | Current limiting high voltage start-up circuit of ultra wide input voltage switching power supply | |
| CN107707229B (en) | A kind of DC solid-state relay | |
| CN212875483U (en) | CT power supply | |
| CN203632566U (en) | Secondary feedback effective integrated multi-protection constant-voltage control circuit for LED driving | |
| CN104953541B (en) | A kind of overvoltage protection | |
| CN112054583A (en) | Integrated CT induction power supply device and power supply method | |
| CN204361769U (en) | A kind of power circuit with solar energy and civil power duplicate supply interface | |
| CN204668923U (en) | Switch power over-voltage protection circuit | |
| CN203708099U (en) | Current-limiting high-voltage startup circuit for switching power supply with ultra-wide input voltage range | |
| CN105827105A (en) | Circuit for realizing AC input voltage limiting by means of switch mode | |
| CN201985770U (en) | Electronic servo transformer and servo/frequency conversion system | |
| CN112104022B (en) | CT power taking power supply | |
| CN213817234U (en) | Protection circuit for AC220V equipment connected to AC380V | |
| CN214204995U (en) | Battery power supply protection circuit and battery power supply system | |
| CN204681075U (en) | A kind of power-down protection circuit | |
| CN202696110U (en) | Overvoltage and under-voltage protection circuit | |
| CN209198534U (en) | A kind of zero cross detection circuit and device | |
| CN205565678U (en) | Overvoltage protector | |
| CN102780203A (en) | Overvoltage and under-voltage protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190101 Termination date: 20200906 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |