CN201383684Y - Automatic reactive power compensation device of low voltage networks - Google Patents
Automatic reactive power compensation device of low voltage networks Download PDFInfo
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- CN201383684Y CN201383684Y CN200920099845U CN200920099845U CN201383684Y CN 201383684 Y CN201383684 Y CN 201383684Y CN 200920099845 U CN200920099845 U CN 200920099845U CN 200920099845 U CN200920099845 U CN 200920099845U CN 201383684 Y CN201383684 Y CN 201383684Y
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Abstract
An automatic reactive power compensation device of low voltage networks relates to a reactive power compensation device of low voltage networks and aims at resolving the problem that the existing reactive power compensation of low voltage networks has steps and can not be regulated steplessly. The automatic reactive power compensation device comprises a potential transformer, a current transformer, a controller, a plurality of triggers and a plurality of groups of capacitance compensation circuits and inductance reactive power compensation circuits, wherein the plurality of groups of capacitance compensation circuits and inductance reactive power compensation circuits are respectively equipped with compensation ends and simultaneously utilize delta connection or star connection, the trigger ends of two inverse-parallel thyristors of each group of the capacitance compensation circuits and inductance reactive power compensation circuits are respectively connected with one trigger signal output end of one of the triggers, the trigger signal output ends of the plurality of triggers are respectively connected with a plurality of output ends of the controller, and two output ends of the controller are respectively connected with the output ends of the potential transformer and the current transformer. The automatic reactive power compensation device is applied to reactive power compensation of low voltage networks.
Description
Technical field
The utility model relates to the full-automatic reactive power compensation device of a kind of low voltage electric network.
Background technology
The power of electrical network output comprises two parts: the one, and active power, the 2nd, reactive power.Electric power system is to the voltage of user power supply, is to change and change along with active power and reactive power that circuit is carried.When circuit was carried the active power of some, the reactive power of conveying was many more, and the loss of voltage of circuit is big more, and the voltage of delivering to user side is just low more.The shunt capacitor reactive-load compensation equipment is installed in electrical network, can be compensated the reactive power that inductive load consumes.
In low voltage electric network, transmission line generally adopts three-phase four-wire system, adopt the capacitor grouping switching to carry out to the compensation of reactive power, this switching mode can produce in the moment of capacitor input and shove, the electric current that produces can be than capacitor rated current big tens times or hundreds of times, the many withstand voltage weak spot of the pole plate of capacitor can be punctured, cause the capacitor can't storage power, influence the useful life of capacitor; The moment of capacitor excision can produce overvoltage again because the terminal voltage of line voltage and capacitor produces superposition.Because the reactive power compensation that this mode realizes is not level and smooth, has step, can occur the group capacitors that drop into more and overcompensation occur, excise a group capacitor and occur under-compensated phenomenon again.
The utility model content
The purpose of this utility model is for there is step in the reactive power compensation that solves present low voltage electric network, and the phenomenon of adjusting that can not be level and smooth provides a kind of low voltage electric network full-automatic reactive power compensation device.
The utility model comprises voltage transformer, current transformer, controller, a plurality of trigger, organizes capacitor compensating circuit and inductive reactive power compensation circuit more, many group capacitor compensating circuits and inductive reactive power compensation circuit are provided with the compensation end, every group of capacitor compensating circuit is made up of three capacitance compensation branch roads, and the thyristor and first electric capacity that capacitance compensation props up route first fast acting fuse, inhibition impulse current reactor, first group of two reverse parallel connection are composed in series successively; The inductive reactive power compensation circuit is made up of three inductive reactive power compensation branch roads, thyristor and inductance that inductive reactive power compensation props up route second fast acting fuse, second group of two reverse parallel connection are composed in series successively, many group capacitor compensating circuits and inductive reactive power compensation circuit adopt delta connection or star-star connection simultaneously, and the capacity of the electric capacity of every group of capacitor compensating circuit equates with the capacity of the reactance of inductive reactive power compensation circuit; The trigger end of the thyristor of second group of two reverse parallel connection in the trigger end of the thyristor of first group of two reverse parallel connection in every capacitance compensation branch road and every the inductive reactive power compensation branch road all is connected the triggering signal output of a trigger respectively, the triggering signal input of a plurality of triggers connects a plurality of outputs of controller respectively, and two inputs of controller connect the output of voltage transformer summation current transformer respectively.
The full-automatic reactive power compensation device of described low voltage electric network, it also comprises the isolated switch of A, the isolated switch of B, the isolated switch of C, the a phase conductor, b phase conductor and c phase conductor, one end of the isolated switch of A connects a phase conductor, one end of the isolated switch of B connects the b phase conductor, one end of the isolated switch of C connects the c phase conductor, capacitor compensating circuit and inductive reactive power compensation circuit adopt delta connection simultaneously, three inductive reactive power compensation branch roads of three capacitance compensation branch roads of every group of capacitor compensating circuit and inductive reactive power compensation circuit are end to end in turn formation delta connections respectively, and three compensation ends of delta connection connect a phase conductor respectively, b phase conductor and c phase conductor.
The full-automatic reactive power compensation device of described low voltage electric network, it also comprises the isolated switch of A, the isolated switch of B, the isolated switch of C, the a phase conductor, b phase conductor and c phase conductor, one end of the isolated switch of A connects a phase conductor, one end of the isolated switch of B connects the b phase conductor, one end of the isolated switch of C connects the c phase conductor, capacitor compensating circuit and inductive reactive power compensation circuit adopt star-star connection simultaneously, the compensation end of one end of first fast acting fuse of every capacitance compensation branch road connects a phase conductor respectively, b phase conductor and c phase conductor, one end of first electric capacity of every capacitance compensation branch road links together and is mid point, forms star-star connection; The compensation end of one end of second fast acting fuse of every inductive reactive power compensation branch road connects a phase conductor, b phase conductor and c phase conductor respectively, and an end of the inductance of every perception compensation branch road links together and is mid point, forms star-star connection.
The full-automatic reactive power compensation device of described low voltage electric network, it also comprises A phase current mutual inductor, B phase current mutual inductor and C phase current mutual inductor, the A phase current mutual inductor is arranged on a phase conductor, the B phase current mutual inductor is arranged on the b phase conductor, the C phase current mutual inductor is arranged on the c phase conductor, and total output of A phase current mutual inductor, B phase current mutual inductor and C phase current mutual inductor is connected a current feedback input of controller.
The full-automatic reactive power compensation device of described low voltage electric network, described controller is by voltage changer, current-to-voltage converter, voltage zero-crossing comparator, the current over-zero comparator, variable connector, the voltage synchronous integrated circuit, central processing unit, keyboard and display are formed, the output of voltage transformer connects the input of voltage changer, first output of voltage changer connects the input of voltage synchronous integrated circuit, second output of voltage changer connects the input of voltage zero-crossing comparator, and the 3rd output of voltage changer connects the first input end of variable connector; The output of current transformer connects the input of current-to-voltage converter, first output of current-to-voltage converter connects the input of current over-zero comparator, second output of current-to-voltage converter connects second input of variable connector, the voltage synchronous integrated circuit, voltage zero-crossing comparator, the current over-zero comparator, the output of variable connector and keyboard is connected five inputs of central processing unit respectively, one of central processing unit shows that output connects the input of display, and a plurality of triggering signal outputs of central processing unit connect the triggering signal input of each trigger respectively.
The utility model has the advantages that:
The utility model is connected in the low voltage electric network by many groups capacitor compensating circuit and one group of inductive reactive power compensation circuit, the compensation way that adopts electric capacity and reactor to combine again in the capacitor compensating circuit, the reactive power of output capacitive that can be level and smooth is come the lagging reactive power of compensation network, realize the level and smooth step-less adjustment of reactive power compensation, improved compensation effect, the power electronics noncontacting switch that the fling-cut switch of capacitor compensating circuit and inductive reactive power compensation circuit adopts thyristor to constitute, can realize the input or the excision capacitor of quick no-flashy-flow, carry out reactive power compensation.The inductive reactive power compensation circuit is controlled the equivalent reactance of inductance by the AC voltage regulator that is made of thyristor, cooperates the reactive power of regulating compensation smoothly with capacitor compensating circuit.
In capacitor compensating circuit, the effect of thyristor is equivalent to switch, controller can according to the real-time power factor of low voltage electric network control that corresponding thyristor is operated in complete conducting or the state that ends under.Under the state that is operated in complete conducting, capacitor directly inserts electrical network, absorbs capacitive reactive power; When being operated under the state that ends, capacitor breaks from electrical network.
In the inductive reactive power compensation circuit, controller can come control break thyristor trigger angle to change the voltage that is added on the inductance according to the real-time power factor of low voltage electric network, when the triggering and conducting angle was 90 °, inductance was equivalent to directly receive on the electrical network, the lagging reactive power maximum of inductance absorption at this moment.When the triggering and conducting angle of thyristor was between 90 °～180 °, thyristor was the partial section conducting, the corresponding change of lagging reactive power that inductance absorbs, when the angle of flow during at 180 °, thyristor turn-offs, and inductance is equivalent to disconnect from electrical network, and the lagging reactive power of inductance absorption at this moment is zero.This shows the electric current that just can change inductance by the angle of flow that increases or reduce thyristor, the equivalent inductive reactance that is equivalent to change inductance promptly changes the lagging reactive power of its absorption.
Description of drawings
Fig. 1 is the structural representation that four groups of capacitor compensating circuits of the utility model and inductive reactive power compensation circuit adopt delta connection, Fig. 2 is the structural representation that four groups of capacitor compensating circuits of the utility model and inductive reactive power compensation circuit adopt star-star connection, and Fig. 3 is the connection diagram of controller of the present utility model.
Embodiment
Embodiment one: below in conjunction with Fig. 1, Fig. 2 illustrates present embodiment, present embodiment comprises voltage transformer 1, current transformer 2, controller 3, a plurality of triggers 4, many group capacitor compensating circuits 8 and inductive reactive power compensation circuit 9, many group capacitor compensating circuits 8 and inductive reactive power compensation circuit 9 are provided with the compensation end, described compensation end is connected on the low-voltage bus bar, every group of capacitor compensating circuit 8 is made up of three capacitance compensation branch road 8-1, and capacitance compensation branch road 8-1 is by the first fast acting fuse 8-1-1, suppress impulse current reactor 8-1-2, the thyristor 8-1-3 of first group of two reverse parallel connection and the first electric capacity 8-1-4 are composed in series successively; Inductive reactive power compensation circuit 9 is made up of three inductive reactive power compensation branch road 9-1, inductive reactive power compensation branch road 9-1 is composed in series successively by the thyristor 9-1-2 and the inductance 9-1-3 of the second fast acting fuse 9-1-1, second group of two reverse parallel connection, many group capacitor compensating circuits 8 and inductive reactive power compensation circuit 9 adopt delta connection or star-star connection simultaneously, and the capacity of the electric capacity of every group of capacitor compensating circuit 8 equates with the capacity of the reactance of inductive reactive power compensation circuit 9; The trigger end of the thyristor 9-1-2 of second group of two reverse parallel connection among the trigger end of the thyristor 8-1-3 of first group of two reverse parallel connection among every capacitance compensation branch road 8-1 and every the inductive reactive power compensation branch road 9-1 all is connected the triggering signal output of a trigger 4 respectively, the triggering signal input of a plurality of triggers 4 connects a plurality of outputs of controller 3 respectively, and two inputs of controller 3 connect the output of voltage transformer 1 summation current transformer 2 respectively.
The capacity of the electric capacity of every group of capacitor compensating circuit 8 is to be the capability value of the electric capacity of unit with kvar, and the capacity of the reactance of inductive reactive power compensation circuit 9 is to be the capability value of the reactance of unit with kvar.
Operation principle of the present utility model is:
A, when dropping into one group of capacitor compensating circuit 8, the angle of flow of the thyristor 9-1-2 of second group of two reverse parallel connection is in the time of 180 ° in the inductive reactive power compensation circuit 9, the lagging reactive power of inductance 9-1-3 absorption at this moment is zero, and total reactive power is the reactive power of capacitor group.
B, when dropping into one group of capacitor compensating circuit 8, the angle of flow of the thyristor 9-1-2 of second group of two reverse parallel connection is in the time of 90 ° in the inductive reactive power compensation circuit 9, inductance 9-1-3 is equivalent to directly receive on the electrical network, the lagging reactive power maximum that inductance absorbs, because the capacity of inductance 9-1-3 equates with the capacity of single group capacitor compensating circuit 8, capacitive reactance and induction reactance offset, and total reactive power is zero.
C, when dropping into one group of capacitor compensating circuit 8, the angle of flow of the thyristor 9-1-2 of second group of two reverse parallel connection is in the time of 90 °～180 ° in the inductive reactive power compensation circuit 9, the lagging reactive power of inductance 9-1-3 absorption at this moment is from being up to minimum, total reactive power is the reactive power after the reactive power of the reactive power of capacitor compensating circuit 8 and inductive reactive power compensation circuit 9 offsets, and variation tendency is: total reactive power be the reactive power of electric capacity by zero to maximum (single reactive power of organizing capacitor compensating circuit).
By above analysis, as can be seen, when dropping into one or more groups capacitor compensating circuit 8, by the reactance amount in control inductance 9-1-3 loop, can be from zero reactive power to the level and smooth output capacitive of maximum, thus reach lagging reactive power in the level and smooth stepless compensation network.
Embodiment two: present embodiment is described below in conjunction with Fig. 1, the difference of present embodiment and execution mode one is that it also comprises the isolated switch 5 of A, the isolated switch 6 of B, the isolated switch 7 of C, a phase conductor 10, b phase conductor 11 and c phase conductor 12, one end of the isolated switch 5 of A connects a phase conductor 10, one end of the isolated switch 6 of B connects b phase conductor 11, one end of the isolated switch 7 of C connects c phase conductor 12, the isolated switch 5 of A, the other end of isolated switch 6 of B and the isolated switch 7 of C is connected to the corresponding of low-voltage bus bar and goes up mutually, capacitor compensating circuit 8 and inductive reactive power compensation circuit 9 adopt delta connection simultaneously, three inductive reactive power compensation branch road 9-1 of three capacitance compensation branch road 8-1 of every group of capacitor compensating circuit 8 and inductive reactive power compensation circuit 9 are end to end in turn formation delta connections respectively, and three compensation ends of delta connection connect a phase conductor 10 respectively, b phase conductor 11 and c phase conductor 12.Other composition and annexation are identical with execution mode one.
As figure
Shown in:
The end of the isolated switch 5QS of A, the isolated switch 6QS of B and the isolated switch 7QS of C inserts the low-voltage bus bar of 400V respectively, and the other end inserts capacitor compensating circuit 8 and inductive reactive power compensation circuit 9 by a phase conductor 10, b phase conductor 11 and c phase conductor 12.
The connection of capacitor compensating circuit:
A phase B phase connection: a phase conductor 10 connects the end of the first fast acting fuse 8-1-1, another termination of the first fast acting fuse 8-1-1 suppresses the end of impulse current reactor 8-1-2, the end of the thyristor 8-1-3 of first group of two reverse parallel connection of another termination of inhibition impulse current reactor 8-1-2, the end of another termination first electric capacity 8-1-4 of the thyristor 8-1-3 of first group of two reverse parallel connection, another termination b phase conductor 11 of the first electric capacity 8-1-4;
B phase C phase connection: b phase conductor 11 connects the end of the first fast acting fuse 8-1-1, another termination of the first fast acting fuse 8-1-1 suppresses the end of impulse current reactor 8-1-2, the end of the thyristor 8-1-3 of first group of two reverse parallel connection of another termination of inhibition impulse current reactor 8-1-2, the end of another termination first electric capacity 8-1-4 of the thyristor 8-1-3 of first group of two reverse parallel connection, another termination c phase conductor 12 of the first electric capacity 8-1-4;
C phase A phase connection: c phase conductor 12 connects the end of the first fast acting fuse 8-1-1, another termination of the first fast acting fuse 8-1-1 suppresses the end of impulse current reactor 8-1-2, the end of the thyristor 8-1-3 of first group of two reverse parallel connection of another termination of inhibition impulse current reactor 8-1-2, the end of another termination first electric capacity 8-1-4 of the thyristor 8-1-3 of first group of two reverse parallel connection, another termination a phase conductor 10 of the first electric capacity 8-1-4.
FU1 among the figure: the first fast acting fuse 8-1-1, main effect is the protection thyristor.
Lx: suppress impulse current reactor 8-1-2, main effect is to be used for the impulse current that may occur when suppression capacitor the drops into electrical network influence to thyristor.
V1: the thyristor 8-1-3 of first group of two reverse parallel connection, main effect is at current zero-crossing point input or excision capacitor.
C: the first electric capacity 8-1-4, main effect is the lagging reactive power of compensation network.
Inductive reactive power compensation circuit 9:
A phase B phase connection: a phase conductor 10 connects the end of the second fast acting fuse 9-1-1, the end of the thyristor 9-1-2 of second group of two reverse parallel connection of another termination of the second fast acting fuse 9-1-1, the end of another termination inductance 9-1-3 of the thyristor 9-1-2 of second group of two reverse parallel connection, another termination b phase conductor 11 of inductance 9-1-3;
B phase C phase connection: b phase conductor 11 connects the end of the second fast acting fuse 9-1-1, the end of the thyristor 9-1-2 of second group of two reverse parallel connection of another termination of the second fast acting fuse 9-1-1, the end of another termination inductance 9-1-3 of the thyristor 9-1-2 of second group of two reverse parallel connection, another termination c phase conductor 12 of inductance 9-1-3;
C phase A phase connection: c phase conductor 12 connects the end of the second fast acting fuse 9-1-1, the end of the thyristor 9-1-2 of second group of two reverse parallel connection of another termination of the second fast acting fuse 9-1-1, the end of another termination inductance 9-1-3 of the thyristor 9-1-2 of second group of two reverse parallel connection, another termination a phase conductor 10 of inductance 9-1-3.
FU2 among the figure: the second fast acting fuse 9-1-1, main effect is the protection thyristor.
V2: the thyristor 9-1-2 of second group of two reverse parallel connection changes equivalent reactance thereby main effect is a voltage of regulating inductance 9-1-3 two ends.
L: inductance 9-1-3, main effect is to match with capacitor compensating circuit 8 to regulate total compensating power.
Embodiment three: present embodiment is described below in conjunction with Fig. 2, the difference of present embodiment and execution mode one is that it also comprises the isolated switch 5 of A, the isolated switch 6 of B, the isolated switch 7 of C, a phase conductor 10, b phase conductor 11 and c phase conductor 12, one end of the isolated switch 5 of A connects a phase conductor 10, one end of the isolated switch 6 of B connects b phase conductor 11, one end of the isolated switch 7 of C connects c phase conductor 12, the isolated switch 5 of A, the other end of isolated switch 6 of B and the isolated switch 7 of C is connected to the corresponding of low-voltage bus bar and goes up mutually, capacitor compensating circuit 8 and inductive reactive power compensation circuit 9 adopt star-star connection simultaneously, the compensation end of the end of the first fast acting fuse 8-1-1 of every capacitance compensation branch road 8-1 of capacitor compensating circuit 8 connects a phase conductor 10 respectively, b phase conductor 11 and c phase conductor 12, the end of the first electric capacity 8-1-4 of every capacitance compensation branch road 8-1 of capacitor compensating circuit 8 links together and is mid point, forms star-star connection; The compensation end of the end of the second fast acting fuse 9-1-1 of every inductive reactive power compensation branch road 9-1 of inductive reactive power compensation circuit 9 connects a phase conductor 10, b phase conductor 11 and c phase conductor 12 respectively, the end of the inductance 9-1-3 of every perception compensation branch road 9-1 of inductive reactive power compensation circuit 9 links together and is mid point, forms star-star connection.Other composition and annexation are identical with execution mode one.
Connection is as shown in Figure 2:
The end of the isolated switch 5QS of A, the isolated switch 6QS of B and the isolated switch 7QS of C inserts the low-voltage bus bar of 400V respectively, and the other end inserts capacitor compensating circuit 8 and inductive reactive power compensation circuit 9 by a phase conductor 10, b phase conductor 11 and c phase conductor 12.
Capacitor compensating circuit:
A phase connection: a phase conductor 10 connects the end of the first fast acting fuse 8-1-1, another termination of the first fast acting fuse 8-1-1 suppresses the end of impulse current reactor 8-1-2, the end of the thyristor 8-1-3 of first group of two reverse parallel connection of another termination of inhibition impulse current reactor 8-1-2, the end of another termination first electric capacity 8-1-4 of the thyristor 8-1-3 of first group of two reverse parallel connection, the other end of electric capacity 8-1-4 is connected with the N of low-voltage bus bar, forms the mid point of star-star connection;
B phase connection: b phase conductor 11 connects the end of the first fast acting fuse 8-1-1, another termination of the first fast acting fuse 8-1-1 suppresses the end of impulse current reactor 8-1-2, the end of the thyristor 8-1-3 of first group of two reverse parallel connection of another termination of inhibition impulse current reactor 8-1-2, the end of another termination first electric capacity 8-1-4 of the thyristor 8-1-3 of first group of two reverse parallel connection, the other end of electric capacity 8-1-4 is connected with the N of low-voltage bus bar, forms the mid point of star-star connection;
C phase connection: c phase conductor 12 connects the end of the first fast acting fuse 8-1-1, another termination of the first fast acting fuse 8-1-1 suppresses the end of impulse current reactor 8-1-2, the end of the thyristor 8-1-3 of first group of two reverse parallel connection of another termination of inhibition impulse current reactor 8-1-2, the end of another termination first electric capacity 8-1-4 of the thyristor 8-1-3 of first group of two reverse parallel connection, the other end of electric capacity 8-1-4 is connected with the N of low-voltage bus bar, forms the mid point of star-star connection.
The inductive reactive power compensation circuit:
A phase connection: a phase conductor 10 connects the end of the second fast acting fuse 9-1-1, the end of the thyristor 9-1-2 of second group of two reverse parallel connection of another termination of the second fast acting fuse 9-1-1, the end of another termination inductance 9-1-3 of the thyristor 9-1-2 of second group of two reverse parallel connection, the other end of inductance 9-1-3 is connected with the N of low-voltage bus bar, forms the mid point of star-star connection;
B phase connection: b phase conductor 11 connects the end of the second fast acting fuse 9-1-1, the end of the thyristor 9-1-2 of second group of two reverse parallel connection of another termination of the second fast acting fuse 9-1-1, the end of another termination inductance 9-1-3 of the thyristor 9-1-2 of second group of two reverse parallel connection, the other end of inductance 9-1-3 is connected with the N of low-voltage bus bar, forms the mid point of star-star connection;
C phase connection: c phase conductor 12 connects the end of the second fast acting fuse 9-1-1, the end of the thyristor 9-1-2 of second group of two reverse parallel connection of another termination of the second fast acting fuse 9-1-1, the end of another termination inductance 9-1-3 of the thyristor 9-1-2 of second group of two reverse parallel connection, the other end of inductance 9-1-3 is connected with the N of low-voltage bus bar, forms the mid point of star-star connection.
Embodiment four: present embodiment is described below in conjunction with Fig. 1, Fig. 2, present embodiment and execution mode two or threes' difference is that it also comprises A phase current mutual inductor 13TA, B phase current mutual inductor 14TA and C phase current mutual inductor 15TA, A phase current mutual inductor 13 is arranged on a phase conductor 10, B phase current mutual inductor 14 is arranged on the b phase conductor 11, C phase current mutual inductor 15 is arranged on the c phase conductor 12, and total output of A phase current mutual inductor 13, B phase current mutual inductor 14 and C phase current mutual inductor 15 is connected a current feedback input of controller 3.Other composition and annexation are identical with execution mode two or three.
In the present embodiment total output of A phase current mutual inductor 13, B phase current mutual inductor 14 and C phase current mutual inductor 15 feed back to the current value of controller 3 can be as the reference value that low voltage electric network is carried out reactive power compensation, it can reflect that capacitor compensating circuit 8 and 9 pairs of low voltage electric networks of inductive reactive power compensation circuit carry out the current value that comprehensively reaches after the reactive power compensation.
Embodiment five: present embodiment is described below in conjunction with Fig. 3, present embodiment and execution mode one, two or three difference is that described controller 3 is by voltage changer 3-1, current-to-voltage converter 3-2, voltage zero-crossing comparator 3-3, current over-zero comparator 3-4, variable connector 3-5, voltage synchronous integrated circuit 3-6, central processing unit 3-7, keyboard 3-8 and display 3-9 form, the output of voltage transformer 1 connects the input of voltage changer 3-1, first output of voltage changer 3-1 connects the input of voltage synchronous integrated circuit 3-6, second output of voltage changer 3-1 connects the input of voltage zero-crossing comparator 3-3, and the 3rd output of voltage changer 3-1 connects the first input end of variable connector 3-5; The output of current transformer 2 connects the input of current-to-voltage converter 3-2, first output of current-to-voltage converter 3-2 connects the input of current over-zero comparator 3-4, second output of current-to-voltage converter 3-2 connects second input of variable connector 3-5, voltage synchronous integrated circuit 3-6, voltage zero-crossing comparator 3-3, current over-zero comparator 3-4, the output of variable connector 3-5 and keyboard 3-8 is connected five inputs of central processing unit 3-7 respectively, one of central processing unit 3-7 shows that output connects the input of display 3-9, and a plurality of triggering signal outputs of central processing unit 3-7 connect the triggering signal input of each trigger 4 respectively.Other composition and annexation are identical with execution mode one, two or three.
Voltage changer 3-1 becomes the voltage transformation of voltage transformer 1 output the voltage signal of 2V, current-to-voltage converter 3-2 changes the electrorheological of current transformer 2 outputs into the voltage signal of 2V, voltage signal one routing voltage synchronous integrated circuit 3-6 is transformed into square-wave signal and delivers to the synchronizing signal of central processing unit 3-7 as circuits for triggering, the model of CPU is 80C196, the secondary route model of voltage signal is that the voltage zero-crossing comparator 3-3 of LM224 converts square-wave signal to and delivers to CPU, the Third Road of voltage signal is input among the variable connector 3-5 that model is CD4051, the first via of current signal is that the current over-zero comparator 3-4 of LM224 converts square-wave signal to and delivers to CPU by model, the second road of current signal is input among the variable connector 3-5 that model is CD4051 simultaneously, the first via of the second road and current signal of voltage signal is compared by the phase angle to voltage signal and current signal by CPU, calculates the power factor of low voltage electric network; Voltage and current signal among the variable connector of the CPU control simultaneously 3-5 is input to CPU respectively, and the A/D change-over circuit by CPU inside carries out analog-to-digital conversion to voltage and current, calculates the size of voltage and current, delivers to display and shows.CPU is according to the power factor that calculates, one side is controlled the conducting of relative trigger device control thyristor groups and is ended and drop into and excise capacitor compensating circuit 8, control the relative trigger device on the other hand and control the terminal voltage of inductance 9-1-3 and change its capacity, cooperate with capacitor compensating circuit to change total reactive power by the angle of flow that changes thyristor groups in the inductive reactive power compensation circuit 9.
Embodiments of the present invention are not limited to above adduction relationship.
Claims (6)
1, the full-automatic reactive power compensation device of a kind of low voltage electric network, it is characterized in that it comprises voltage transformer (1), current transformer (2), controller (3), a plurality of triggers (4), many group capacitor compensating circuits (8) and inductive reactive power compensation circuit (9), many group capacitor compensating circuits (8) and inductive reactive power compensation circuit (9) are provided with the compensation end, every group of capacitor compensating circuit (8) is made up of three capacitance compensation branch roads (8-1), and capacitance compensation branch road (8-1) is by first fast acting fuse (8-1-1), suppress impulse current reactor (8-1-2), the thyristor (8-1-3) and first electric capacity (8-1-4) of first group of two reverse parallel connection are composed in series successively; Inductive reactive power compensation circuit (9) is made up of three inductive reactive power compensation branch roads (9-1), inductive reactive power compensation branch road (9-1) is composed in series successively by the thyristor (9-1-2) and the inductance (9-1-3) of second fast acting fuse (9-1-1), second group of two reverse parallel connection, many group capacitor compensating circuits (8) and inductive reactive power compensation circuit (9) adopt delta connection or star-star connection simultaneously, and the capacity of the electric capacity of every group of capacitor compensating circuit (8) equates with the capacity of the reactance of inductive reactive power compensation circuit (9); The trigger end of the thyristor (9-1-2) of second group of two reverse parallel connection in the trigger end of the thyristor (8-1-3) of first group of two reverse parallel connection in every capacitance compensation branch road (8-1) and every the inductive reactive power compensation branch road (9-1) all is connected the triggering signal output of (4) of a trigger respectively, the triggering signal input of a plurality of triggers (4) connects a plurality of outputs of controller (3) respectively, and two inputs of controller (3) connect the output of voltage transformer (1) summation current transformer (2) respectively.
2, the full-automatic reactive power compensation device of low voltage electric network according to claim 1, it is characterized in that it also comprises the isolated switch of A (5), the isolated switch of B (6), the isolated switch of C (7), a phase conductor (10), b phase conductor (11) and c phase conductor (12), one end of the isolated switch of A (5) connects a phase conductor (10), one end of the isolated switch of B (6) connects b phase conductor (11), one end of the isolated switch of C (7) connects c phase conductor (12), capacitor compensating circuit (8) and inductive reactive power compensation circuit (9) adopt delta connection simultaneously, three capacitance compensation branch roads (8-1) of every group of capacitor compensating circuit (8) and three inductive reactive power compensation branch roads (9-1) of inductive reactive power compensation circuit (9) are end to end in turn formation delta connection respectively, and three compensation ends of delta connection connect a phase conductor (10) respectively, b phase conductor (11) and c phase conductor (12).
3, the full-automatic reactive power compensation device of low voltage electric network according to claim 1, it is characterized in that it also comprises the isolated switch of A (5), the isolated switch of B (6), the isolated switch of C (7), a phase conductor (10), b phase conductor (11) and c phase conductor (12), one end of the isolated switch of A (5) connects a phase conductor (10), one end of the isolated switch of B (6) connects b phase conductor (11), one end of the isolated switch of C (7) connects c phase conductor (12), capacitor compensating circuit (8) and inductive reactive power compensation circuit (9) adopt star-star connection simultaneously, the compensation end of one end of first fast acting fuse (8-1-1) of every capacitance compensation branch road (8-1) of capacitor compensating circuit (8) connects a phase conductor (10) respectively, b phase conductor (11) and c phase conductor (12), one end of first electric capacity (8-1-4) of every capacitance compensation branch road (8-1) of capacitor compensating circuit (8) links together and is mid point, forms star-star connection; The compensation end of one end of second fast acting fuse (9-1-1) of every inductive reactive power compensation branch road (9-1) of inductive reactive power compensation circuit (9) connects a phase conductor (10), b phase conductor (11) and c phase conductor (12) respectively, one end of the inductance (9-1-3) of every perception compensation branch road (9-1) of inductive reactive power compensation circuit (9) links together and is mid point, forms star-star connection.
4, according to claim 2 or the full-automatic reactive power compensation device of 3 described low voltage electric networks, it is characterized in that it also comprises A phase current mutual inductor (13), B phase current mutual inductor (14) and C phase current mutual inductor (15), A phase current mutual inductor (13) is arranged on a phase conductor (10), B phase current mutual inductor (14) is arranged on the b phase conductor (11), C phase current mutual inductor (15) is arranged on the c phase conductor (12), A phase current mutual inductor (13), total output of B phase current mutual inductor (14) and C phase current mutual inductor (15) is connected a current feedback input of controller (3).
5, according to claim 1 or the full-automatic reactive power compensation device of 2 or 3 described low voltage electric networks, it is characterized in that described controller (3) is by voltage changer (3-1), current-to-voltage converter (3-2), voltage zero-crossing comparator (3-3), current over-zero comparator (3-4), variable connector (3-5), voltage synchronous integrated circuit (3-6), central processing unit (3-7), keyboard (3-8) and display (3-9) are formed, the output of voltage transformer (1) connects the input of voltage changer (3-1), first output of voltage changer (3-1) connects the input of voltage synchronous integrated circuit (3-6), second output of voltage changer (3-1) connects the input of voltage zero-crossing comparator (3-3), and the 3rd output of voltage changer (3-1) connects the first input end of variable connector (3-5); The output of current transformer (2) connects the input of current-to-voltage converter (3-2), first output of current-to-voltage converter (3-2) connects the input of current over-zero comparator (3-4), second output of current-to-voltage converter (3-2) connects second input of variable connector (3-5), voltage synchronous integrated circuit (3-6), voltage zero-crossing comparator (3-3), current over-zero comparator (3-4), the output of variable connector (3-5) and keyboard (3-8) is connected five inputs of central processing unit (3-7) respectively, one of central processing unit (3-7) shows that output connects the input of display (3-9), and a plurality of triggering signal outputs of central processing unit (3-7) connect the triggering signal input of each trigger (4) respectively.
6, the full-automatic reactive power compensation device of low voltage electric network according to claim 4, it is characterized in that described controller (3) is by voltage changer (3-1), current-to-voltage converter (3-2), voltage zero-crossing comparator (3-3), current over-zero comparator (3-4), variable connector (3-5), voltage synchronous integrated circuit (3-6), central processing unit (3-7), keyboard (3-8) and display (3-9) are formed, the output of voltage transformer (1) connects the input of voltage changer (3-1), first output of voltage changer (3-1) connects the input of voltage synchronous integrated circuit (3-6), second output of voltage changer (3-1) connects the input of voltage zero-crossing comparator (3-3), and the 3rd output of voltage changer (3-1) connects the first input end of variable connector (3-5); The output of current transformer (2) connects the input of current-to-voltage converter (3-2), first output of current-to-voltage converter (3-2) connects the input of current over-zero comparator (3-4), second output of current-to-voltage converter (3-2) connects second input of variable connector (3-5), voltage synchronous integrated circuit (3-6), voltage zero-crossing comparator (3-3), current over-zero comparator (3-4), the output of variable connector (3-5) and keyboard (3-8) is connected five inputs of central processing unit (3-7) respectively, one of central processing unit (3-7) shows that output connects the input of display (3-9), and a plurality of triggering signal outputs of central processing unit (3-7) connect the triggering signal input of each trigger (4) respectively.
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| CN200920099845U CN201383684Y (en) | 2009-05-13 | 2009-05-13 | Automatic reactive power compensation device of low voltage networks |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101877485A (en) * | 2010-06-09 | 2010-11-03 | 哈尔滨东大方正电力有限公司 | Harmonic filter in power supply system |
| CN104578096A (en) * | 2014-12-24 | 2015-04-29 | 江苏卡欧新能源科技有限公司 | Reactive compensation system and control method thereof |
| CN105977976A (en) * | 2016-06-23 | 2016-09-28 | 国网河南新安县供电公司 | Power compensation distribution network equipment and method |
| CN108565873A (en) * | 2018-05-29 | 2018-09-21 | 深圳市禾望电气股份有限公司 | A kind of three phase capacitance switching control circuit and current transformer |
| CN110176775A (en) * | 2019-06-12 | 2019-08-27 | 聊城华瑞电气有限公司 | Idle compensating control and its control method |
-
2009
- 2009-05-13 CN CN200920099845U patent/CN201383684Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101877485A (en) * | 2010-06-09 | 2010-11-03 | 哈尔滨东大方正电力有限公司 | Harmonic filter in power supply system |
| CN104578096A (en) * | 2014-12-24 | 2015-04-29 | 江苏卡欧新能源科技有限公司 | Reactive compensation system and control method thereof |
| CN105977976A (en) * | 2016-06-23 | 2016-09-28 | 国网河南新安县供电公司 | Power compensation distribution network equipment and method |
| CN108565873A (en) * | 2018-05-29 | 2018-09-21 | 深圳市禾望电气股份有限公司 | A kind of three phase capacitance switching control circuit and current transformer |
| CN110176775A (en) * | 2019-06-12 | 2019-08-27 | 聊城华瑞电气有限公司 | Idle compensating control and its control method |
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