CN106130047B - A kind of low voltage electric network utility power quality control system - Google Patents
A kind of low voltage electric network utility power quality control system Download PDFInfo
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- CN106130047B CN106130047B CN201610719260.3A CN201610719260A CN106130047B CN 106130047 B CN106130047 B CN 106130047B CN 201610719260 A CN201610719260 A CN 201610719260A CN 106130047 B CN106130047 B CN 106130047B
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Abstract
The present invention relates to low voltage power transmission technical fields, a kind of low voltage electric network utility power quality control system is provided, including AC three-phase load automatic-balancing system and alternating voltage automatic voltage regulation system, single-chip microcontroller in AC three-phase load automatic-balancing system is monitored each road phases line voltage, and customer charge is switched in the most light phase line of load, realize the autobalance to three-phase load, quick cut phase, transformer burnout failure caused by also reducing because of inclined phase simultaneously, simultaneously, the inverter circuit of alternating voltage automatic voltage regulation system is stable to provide 380V alternating supply voltage for electrical equipment, realize the stabilization to voltage, line loss is reduced simultaneously, improve power supply quality.
Description
Technical field
The invention belongs to low voltage power transmission technical field more particularly to a kind of low voltage electric network utility power quality control systems.
Background technique
An important evaluation index of the voltage as power quality is the primary condition for ensureing electric service, is related to confession
The ability of power quality and service socio-economic development.In recent years, the economic sustainable and stable development of Chinese society, urban and rural residents' consumption
Level is continuously improved, and especially by the excitation of the serial Huimin policy such as national " household electrical appliances are gone to the countryside ", rural electricity consumption demand is always maintained at
Very fast growth trend.Rural Power Distribution Network construction retrofit relatively lags behind, and causes the supply voltage of partial region relatively low, cannot be fine
Meet industrial and agricultural production and rural resident's household electricity demand.
Power distribution network especially rural power grids have the characteristics that a little more, wire length, wide, load, electricity consumption concentration, cause agriculture
Village's voltage chronicity is unstable.The randomness of rural electricity consumption load, seasonality, periodic feature are obvious.Voltage when electricity consumption ebb
Height, peak of power consumption period low-voltage outstanding problem, causing part household electrical appliance can not normal use.
The problem of spread of voltage, three-phase imbalance, in addition to the normal electricity consumption of influence user, can also reduce electrical equipment
Service efficiency and economic benefit influence the normal operation and product quality of production equipment, increase grid power loss and electric energy damage
Consumption, jeopardizes electric system and the safe operation of electricity supply and use equipment.
Summary of the invention
The purpose of the present invention is to provide a kind of low voltage electric network utility power quality control systems, it is intended to solve electric in the prior art
Normal electricity consumption of the problem of the pressing unstable, three-phase imbalance in addition to influencing user, can also reduce electrical equipment service efficiency and
Economic benefit influences the normal operation and product quality of production equipment, increases grid power loss and electric energy loss, jeopardizes electric power
The problem of safe operation of system and electricity supply and use equipment.
The invention is realized in this way a kind of low voltage electric network utility power quality control system, the low voltage electric network power quality
Control system includes AC three-phase load automatic-balancing system and alternating voltage automatic voltage regulation system；
The AC three-phase load automatic-balancing system include by the first access point access A phase line A phase sample circuit,
The B phase sample circuit of B phase line is accessed by the second access point and the C phase sample circuit of C phase line is accessed by third access point；
The output end of the A phase sample circuit, B phase sample circuit and C phase sample circuit is all connected with signal conversion and rectification
Circuit, the signal conversion is connected with rectification circuit carries out voltage monitoring to A phase line, B phase line and C phase line and for controlling respectively
Switch the single-chip microcontroller of phase line, the single-chip microcontroller connects relay assembly circuit, and the relay assembly circuit includes the first relay
Device switch, the second relay switch and third relay switch；
The AC three-phase load automatic-balancing system further includes first contactor, second contactor and third contactor,
The first contactor include the first contact-making switch and the first hot-wire coil, the second contactor include the second contact-making switch and
Second hot-wire coil, the third contactor include third contact-making switch and third hot-wire coil；
First contact-making switch is mounted in the A phase line in first access point downstream, and described second connects
Touching switch is mounted in the B phase line in second access point downstream, and the third contact-making switch is mounted on institute
It states in the C phase line in third access point downstream；
First hot-wire coil is connect with first relay switch, second hot-wire coil with described second after
Electric switch connection, the third hot-wire coil are connect with the third relay switch；
Alternating voltage automatic voltage regulation system includes step-up transformer, rectification circuit and inverter circuit；
The input terminal of the step-up transformer is equipped with exchange A phase input port, alternating-current B phase input port, exchange C phase and inputs
Port exchanges A phase mesolow output port, alternating-current B phase mesolow output port and exchanges C phase mesolow output port；
The rectification circuit includes that the first rectification branch circuit, the second rectification branch circuit and third rectify branch circuit,
The first rectification branch circuit is connect with the exchange A phase mesolow output port, the second rectification branch circuit and institute
The connection of alternating-current B phase mesolow output port is stated, the third rectification branch circuit connects with the C phase mesolow output port that exchanges
It connects；
The inverter circuit is connected to the output end of the rectification circuit, and the inverter circuit includes the first inversion branch electricity
Road, the second inversion branch circuit and third inversion branch circuit, the first inversion branch circuit exchange A phase output terminal with 380V
Mouthful connection, the second inversion branch circuit connect with 380V alternating-current B phase output terminal mouth, the third inversion branch circuit and
380V exchanges the connection of C phase output terminal mouth；
First relay switch, the second relay switch and third relay switch are single-pole double-throw switch (SPDT)；
The relay assembly circuit includes relay interlocking control circuit；
The relay interlocking control circuit includes that power access end, the first wiring section, the second wiring section and third connect
Line segment；
Described first wiring section one end is connect with first hot-wire coil, and the other end is equipped with the first contact；
Described second wiring section one end is connect with second hot-wire coil, and the other end is equipped with the second contact；
Described third wiring section one end is connect with the third hot-wire coil, and the other end is equipped with third contact；
The 4th wiring section, the 4th wiring are equipped between first relay switch and second relay switch
One end of section is connect with the stationary contact of first relay switch, and the other end is equipped with the 4th contact；
The 5th wiring section, the 5th wiring are equipped between second relay switch and the third relay switch
One end of section is connect with the stationary contact of second relay, and the other end is equipped with the 5th contact, second relay switch
Movable contact is fastened on the 4th contact or the second contact；
The stationary contact of the third relay switch is connect with the power access end, and the third relay switch moves
Contact is fastened on the 5th contact or third contact.
As an improvement scheme, first contact is the normally-closed contact of first relay switch, described the
Two contacts are the normally opened contact of second relay, and the 4th contact is the normally-closed contact of second relay, described
Third contact is the normally opened contact of the third relay switch, and the 5th contact is the normally closed of the third relay switch
Contact.
As an improvement scheme, the AC three-phase load automatic-balancing system further include contactor interlocking control electricity
Road；
The contactor interlocking control circuit includes being connected between phase line and the neutral conductor and the first via parallel with one another is mutual
Lock circuit, No. second interlock circuit and third road interlock circuit；
The first contactor, second contactor and third contactor further include that the first auxiliary contactor switch and second are auxiliary
Help contact-making switch；
The first via interlock circuit include the first relay switch being sequentially connected in series between the phase line and the neutral conductor,
First auxiliary contactor switch of second contactor, the first auxiliary contactor switch of third contactor and the first hot-wire coil；
No. second interlock circuit include the second relay switch being sequentially connected in series between the phase line and the neutral conductor,
First auxiliary contactor switch of first contactor, the second auxiliary contactor switch of third contactor and the second hot-wire coil；
Third road interlock circuit include the third relay switch being sequentially connected in series between the phase line and the neutral conductor,
Second auxiliary contactor switch of first contactor, the second auxiliary contactor switch of second contactor and third hot-wire coil.
As an improvement scheme, it is described first rectification branch circuit, second rectification branch circuit and third rectification point
Branch circuit is made of two first crystal diodes.
As an improvement scheme, the first inversion branch circuit, the second inversion branch circuit and third inversion
Branch circuit includes the first Intelligent power module circuit and the second Intelligent power module circuit being cascaded；
Between the first Intelligent power module circuit and the second Intelligent power module circuit of the first inversion branch circuit
Line draw connection to the 380V exchange A phase output terminal mouth；
Between the first Intelligent power module circuit and the second Intelligent power module circuit of the second inversion branch circuit
The connection that line is drawn is to the 380V alternating-current B phase output terminal mouth；
Between the first Intelligent power module circuit and the second Intelligent power module circuit of the third inversion branch circuit
Line draw connection to the 380V exchange C phase output terminal mouth.
As an improvement scheme, first Intelligent power module circuit and the second Intelligent power module circuit wrap
Insulated gate bipolar transistor and the second crystal diode are included, wherein：
It is connected in parallel on after first Intelligent power module circuit and second Intelligent power module circuit concatenation described whole
The both ends of current circuit；
The collector of the insulated gate bipolar transistor of first Intelligent power module circuit and second intelligent power
The connection that line between the emitter of the insulated gate bipolar transistor of modular circuit is drawn is defeated to 380V exchange A phase
Exit port or 380V alternating-current B phase output terminal mouth or 380V exchange C phase output terminal mouth.
As an improvement scheme, the alternating voltage automatic voltage regulation system further include be located at the inverter circuit front end
The first filter circuit, first filter circuit and at the both ends of the rectification circuit；
First filter circuit is composed in parallel by 2 condenser networks, and the condenser network includes several concatenated electricity
Hold；
The alternating voltage automatic voltage regulation system further includes the second filter circuit positioned at first filter circuit front end,
Second filter circuit is serially connected between the rectification circuit and first filter circuit, and second filter circuit includes
First inductor.
As an improvement scheme, 380V exchange A phase output terminal mouth, 380V alternating-current B phase output terminal mouth and
The front end of 380V exchange C phase output terminal mouth is respectively equipped with second inductor.
As an improvement scheme, the step-up transformer be used to it is described exchange A phase mesolow output port, exchange
B phase mesolow output port and the voltage tap for exchanging C phase mesolow output port connecting side and being respectively equipped with several gears, it is described
Voltage tap includes 400V gear, 480V gear, 690V gear, 900V gear and 1140V gear.
In embodiments of the present invention, low voltage electric network utility power quality control system includes AC three-phase load automatic-balancing system
With alternating voltage automatic voltage regulation system, wherein：
AC three-phase load automatic-balancing system includes A phase sample circuit, B phase sample circuit, C phase sample circuit, rectification
Circuit, single-chip microcontroller, relay assembly circuit and first contactor, second contactor and third contactor；Rectification circuit connection
Single-chip microcontroller, single-chip microcontroller connect relay assembly circuit, first contactor include the first contact-making switch and the first hot-wire coil, second
Contactor includes the second contact-making switch and the second hot-wire coil, and third contactor includes third contact-making switch and third live wire
Circle；First hot-wire coil is connect with the first relay switch, and the second hot-wire coil is connect with the second relay switch, and third is powered
Coil is connect with third relay switch, and customer charge is switched to by single-chip microcontroller for being monitored to each road phases line voltage
It in the most light phase line of load, realizes to the autobalance of three-phase load, quick cut phase, while transformation caused by also reducing because of inclined phase
Device burnout failure；
Alternating voltage automatic voltage regulation system includes step-up transformer, rectification circuit and inverter circuit；Step-up transformer it is defeated
Enter end and is equipped with exchange A phase input port, alternating-current B phase input port, exchange C phase input port, exchange A phase mesolow output end
Mouthful, alternating-current B phase mesolow output port and exchange C phase mesolow output port；Rectification circuit include first rectification branch circuit,
Second rectification branch circuit and third rectify branch circuit, and the first rectification branch circuit connects with A phase mesolow output port is exchanged
Connect, second rectification branch circuit is connect with alternating-current B phase mesolow output port, third rectification branch circuit with exchange it is low in C phase
Press output port connection；Inverter circuit is connected to the output end of the rectification circuit, and inverter circuit includes the first inversion branch electricity
Road, the second inversion branch circuit and third inversion branch circuit, the first inversion branch circuit exchange A phase output terminal mouth company with 380V
It connects, the second inversion branch circuit is connect with 380V alternating-current B phase output terminal mouth, and it is defeated that third inversion branch circuit exchanges C phase with 380V
Exit port connection, the stable stabilization for providing 380V alternating supply voltage for electrical equipment, realizing to voltage of inverter circuit,
Line loss is reduced simultaneously, improves power supply quality.
Due to the setting of relay interlocking control circuit and contactor interlocking control circuit, make entire AC three-phase load certainly
The quick cut phase of dynamic balance system safety and steady, avoids safety accident caused by phase short-circuit between conductors.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of AC three-phase load automatic-balancing system provided by the invention；
Fig. 2 is the structural schematic diagram of relay interlocking control circuit provided by the invention；
Fig. 3 is the structural schematic diagram of contactor interlocking control circuit provided by the invention；
Fig. 4 is the structural schematic diagram of alternating voltage automatic voltage regulation system provided by the invention；
Wherein, the first access point of 1-, the second access point of 2-, 3- third access point, 4-A phase sample circuit, 5-B phase sample electricity
Road, 6-C phase sample circuit, the conversion of 7- signal and rectification circuit, 8- single-chip microcontroller, 9- relay assembly circuit, the first relay of 10-
Switch, the second relay switch of 11-, 12- third relay switch, the first contact-making switch of 13-, the first hot-wire coil of 14-, 15-
Second contact-making switch, the second hot-wire coil of 16-, 17- third contact-making switch, 18- third hot-wire coil, 19- power access end,
20- the first wiring section, 21- the second wiring section, 22- third wiring section, the first contact 23-, the second contact 24-, the touching of 25- third
Point, the 4th wiring section of 26-, the 4th contact 27-, the 5th wiring section of 28-, the 5th contact 29-, 30- first via interlock circuit, 31-
No. second interlock circuit, 32- third road interlock circuit, the first auxiliary contactor switch of 33- first contactor, 34- first are contacted
Second auxiliary contactor switch of device, the first auxiliary contactor switch of 35- second contactor, the second auxiliary of 36- second contactor
Contact-making switch, the first auxiliary contactor switch of 37- third contactor, the second auxiliary contactor switch of 38- third contactor, 39-
Step-up transformer, 40- rectification circuit, 41- exchange A phase input port, 42- alternating-current B phase input port, and 43- exchanges C phase input terminal
Mouthful, 44- exchanges A phase mesolow output port, 45- alternating-current B phase mesolow output port, and 46- exchanges C phase mesolow output end
Mouthful, 47- first rectifies branch circuit, and 48- second rectifies branch circuit, and 49- third rectifies branch circuit, the first inverse variation of 50-
Branch circuit, 51- the second inversion branch circuit, the first Intelligent power module circuit of 52-, the second Intelligent power module circuit of 53-,
54- insulated gate bipolar transistor, the second crystal diode of 55-, the first filter circuit of 56-, the second filter circuit of 57-, 58- electricity
Hold, the first inductor of 59-, the second inductor of 60-, 61-380V exchange A phase output terminal mouth, 62-380V alternating-current B phase output terminal mouth,
63-380V exchanges C phase output terminal mouth, 64- third inversion branch circuit.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 1 shows the structural schematic diagram of AC three-phase load automatic-balancing system provided by the invention, for the ease of saying
It is bright, part related to the present invention is only gived in figure.
AC three-phase load automatic-balancing system includes the A phase sample circuit 4 for accessing A phase line by the first access point 1, leads to
It crosses the B phase sample circuit 5 of the second access point 2 access B phase line and accesses the C phase sample circuit 6 of C phase line by third access point 3；
The output end of A phase sample circuit 4, B phase sample circuit 5 and C phase sample circuit 6 is all connected with signal conversion and rectified current
Road 7, signal conversion and the connection of rectification circuit 7 carry out voltage monitoring to A phase line, B phase line and C phase line and respectively for controlling switching
The single-chip microcontroller 8 of phase line, single-chip microcontroller 8 connect relay assembly circuit 9, relay assembly circuit 9 include the first relay switch 10,
Second relay switch 11 and third relay switch 12；
AC three-phase load automatic-balancing system further includes first contactor, second contactor and third contactor, and first
Contactor includes the first contact-making switch 13 and the first hot-wire coil 14, and second contactor includes that the second contact-making switch 15 and second is logical
Electric coil 16, third contactor include third contact-making switch 17 and third hot-wire coil 18；
First contact-making switch 13 is mounted in the A phase line in 1 downstream of the first access point, and the second contact-making switch 15 is mounted on
In the B phase line in the second access point downstream, third contact-making switch 17 is mounted in the C phase line in third access point downstream；
First hot-wire coil 14 is connect with the first relay switch 10, the second hot-wire coil 16 and the second relay switch 11
Connection, third hot-wire coil 18 are connect with third relay switch 12.
Wherein, above-mentioned A phase sample circuit 4, B phase sample circuit 5 and C phase sample circuit 6 are made of mutual inductor, main
For being acquired to voltage, the electric current in corresponding phase line, and send collected voltage to signal conversion and rectification circuit
7, then single-chip microcontroller 8 is transferred to be timed monitoring again, continues to monitor a period of time, and to this period of time each phase line of past
Voltage value is calculated, and controls being switched in the most light phase line of load using phase line by electrical equipment, for mutual inductor
Connection structure, details are not described herein.
It is 24 hours that this is continued to monitor for a period of time, can generally embody within 24 hours the state of power load in phase line.
In this embodiment, the first relay switch 10, the second relay switch 11 and third relay switch 12 are
Single-pole double-throw switch (SPDT) keeps entire circuit structure simple, handling strong.
It in embodiments of the present invention, further include relay interlocking control circuit in above-mentioned relay assembly circuit 9, it should be after
Electric appliance interlocking control circuit is used for the safety to cut phase is ensured, i.e., before power load is switched to next phase line, in addition
Circuitry cuts state is guaranteed in two phase lines.
Wherein, as shown in Fig. 2, above-mentioned relay interlocking controller circuit include power access end 19, the first wiring section 20,
Second wiring section 21 and third wiring section 22；
First wiring section, 20 one end is connect with the first hot-wire coil 14, and the other end is equipped with the first contact 23；
Second wiring section, 21 one end is connect with the second hot-wire coil 16, and the other end is equipped with the second contact 24；
22 one end of third wiring section is connect with third hot-wire coil 18, and the other end is equipped with third contact 25；
The 4th wiring section 26 is equipped between first relay switch 10 and the second relay switch 11, the 4th wiring section 26
One end is connect with the stationary contact of the first relay switch 10, and the other end is equipped with the 4th contact 27；
The 5th wiring section 28 is equipped between second relay switch 11 and third relay switch 12, the 5th wiring section 28
One end is connect with the stationary contact of the second relay, and the other end is equipped with the 5th contact 29, the movable contact button of the second relay switch 11
It closes on the 4th contact 27 or the second contact 24；
The stationary contact of third relay switch 12 is connect with power access end 19, the movable contact button of third relay switch 12
It closes on the 5th contact 29 or third contact 25.
In this embodiment, as shown in Fig. 2, the first contact 23 is the normally-closed contact of the first relay switch 10, the second touching
Point 24 is the normally opened contact of the second relay, and the 4th contact 27 is the normally-closed contact of the second relay, and third contact 25 is third
The normally opened contact of relay switch 12, the 5th contact 29 are the normally-closed contact of third relay switch 12.
In embodiments of the present invention, AC three-phase load automatic-balancing system further includes contactor interlocking control circuit, should
Contactor interlocking control circuit is used for the safety to cut phase is ensured, i.e., before power load is switched to next phase line, separately
It is guaranteed at circuitry cuts state in outer two phase lines, i.e., regardless of the state of relay switch, all in circuitry cuts shape
State.
As shown in figure 3, contactor interlocking control circuit includes being connected between phase line and the neutral conductor and parallel with one another
Interlock circuit 30, No. second interlock circuit 31 and third road interlock circuit 32 all the way；
Wherein, first contactor, second contactor and third contactor further include the first auxiliary contactor switch and second
Auxiliary contactor switch；
First via interlock circuit 30 includes the first relay switch 10, second being sequentially connected in series between phase line and the neutral conductor
First auxiliary contactor switch 35 of contactor, the first auxiliary contactor switch 37 of third contactor and the first hot-wire coil 14；
No. second interlock circuit 31 includes the second relay switch 11, first being sequentially connected in series between phase line and the neutral conductor
First auxiliary contactor switch 33 of contactor, the second auxiliary contactor switch 38 of third contactor and the second hot-wire coil 16；
Third road interlock circuit 32 includes the third relay switch 12, first being sequentially connected in series between phase line and the neutral conductor
Second auxiliary contactor switch 34 of contactor, the second auxiliary contactor switch 36 of second contactor and third hot-wire coil 18.
For ease of description, it is illustrated in conjunction with working principle of the Fig. 3 to contactor interlocking control circuit：
Assuming that power load continues monitoring in 24 hours through single-chip microcontroller 8 on first via interlock circuit 30 at present, phase is determined
Line B is the phase line that load is most light in three-phase, therefore, it is necessary to control for power load to be switched on phase line B, at this point, single-chip microcontroller 8 is given
First relay switch sends open command, sends close command to the second relay switch；
First relay switch disconnects, the second relay switch closure, while the first auxiliary for controlling second contactor connects
Touching switch, the second auxiliary contactor switch are in off-state, and the first auxiliary contactor switch 33 of first contactor, third connect
Second auxiliary contactor switch of tentaculum is in closed state, at this point, No. second interlock circuit is in energized state；
Second hot-wire coil 16 of second contactor powers on, and is attracted the second contact-making switch 15 closure, power load is switched
Onto phase line B.
As shown in figure 4, alternating voltage automatic voltage regulation system includes step-up transformer 39, rectification circuit 40 and inverter circuit；
The input terminal of the step-up transformer 39 is equipped with exchange A phase input port 41, alternating-current B phase input port 42, exchange C
Phase input port 43, exchange A phase mesolow output port 44, alternating-current B phase mesolow output port 45 and to exchange C phase mesolow defeated
Exit port 46；
The rectification circuit 40 includes that the first rectification branch circuit 47, second rectifies branch circuit 48 and third rectification branch
Circuit 49, the first rectification branch circuit 47 are connect with the exchange A phase mesolow output port 44, second rectification point
Branch circuit 48 is connect with the alternating-current B phase mesolow output port 45, and the third rectification branch circuit 49 exchanges C phase with described
Mesolow output port 46 connects；
The inverter circuit is connected to the output end of the rectification circuit 40, and the inverter circuit includes the first inversion branch
Circuit 50, the second inversion branch circuit 51 and third inversion branch circuit 64, the first inversion branch circuit 50 and 380V are handed over
A phase output terminal mouth 61 is flowed to connect, the second inversion branch circuit 51 connect with 380V alternating-current B phase output terminal mouth 62, and described the
Three inversion branch circuits 64 are connect with 380V exchange C phase output terminal mouth 63.
Wherein, above-mentioned step-up transformer 39 is mainly used for the voltage for conveying transformer from 380V promotion to 400-1140V
Range, be then direct current by AC rectification by rectification circuit 40, then will the obtained direct current of rectification be delivered to it is inverse
Change device carries out inversion again as the 380V alternating current for meeting electrical equipment demand, and stablizes output.
In embodiments of the present invention, the first rectification branch circuit 47, second rectifies branch circuit 48 and third rectifies branch
Circuit 49 is made of two first crystal diodes.
As shown in figure 4, the first inversion branch circuit 50, the second inversion branch circuit 51 and third inversion branch circuit 64
It include the first Intelligent power module circuit 52 and the second Intelligent power module circuit 53 being cascaded；
The first Intelligent power module circuit 52 and the second Intelligent power module circuit of the first inversion branch circuit 50
Between 53 line draw connection to the 380V exchange A phase output terminal mouth 61；
The first Intelligent power module circuit 52 and the second Intelligent power module circuit of the second inversion branch circuit 51
The connection that line is drawn between 53 is to the 380V alternating-current B phase output terminal mouth 62；
The first Intelligent power module circuit 52 and the second Intelligent power module circuit of the third inversion branch circuit 64
Between 53 line draw connection to the 380V exchange C phase output terminal mouth 63.
Wherein, the first Intelligent power module circuit 52 and the second Intelligent power module circuit 53 include that insulated gate bipolar is brilliant
Body pipe 54 and the second crystal diode 55, wherein：
Institute is connected in parallel on after first Intelligent power module circuit 52 and 53 circuit of the second intelligent power module concatenation
State the both ends of rectification circuit 40；
The collector of the insulated gate bipolar transistor 54 of first Intelligent power module circuit 52 and second intelligence
The connection that line between the emitter of the insulated gate bipolar transistor 54 of power module circuit 53 is drawn is to the 380V
It exchanges A phase output terminal mouth 61 or 380V alternating-current B phase output terminal mouth 62 or 380V exchanges C phase output terminal mouth 63.
In embodiments of the present invention, filter circuit is set in 40 rear end side of rectification circuit, wherein the filter circuit can wrap
The first filter circuit 56 and the second filter circuit 57 are included, specially：
Alternating voltage automatic voltage regulation system further includes the first filter circuit 56 positioned at the inverter circuit front end, and described the
One filter circuit 56 and at the both ends of the rectification circuit 40；
First filter circuit 56 is composed in parallel by 2 condenser networks, and the condenser network includes several concatenated capacitors
58。
Meanwhile alternating voltage automatic voltage regulation system further includes the second filtered electrical positioned at 56 front end of the first filter circuit
Road 57, second filter circuit 57 are serially connected between rectification circuit 40 and the first filter circuit 56, second filter circuit
57 include the first inductor 59.
In embodiments of the present invention, 380V exchanges A phase output terminal mouth 61,380V alternating-current B phase output terminal mouth 62 and 380V
The front end of exchange C phase output terminal mouth 63 is respectively equipped with second inductor 60, and the setting of second inductor 60 is to inversion electricity
The signal of road output is adjusted, and so that it is more met sine waveform, details are not described herein.
As shown in figure 4, step-up transformer 4 is used to exchange A phase mesolow output port 44, alternating-current B phase mesolow with described
Output port 45 and the voltage tap for exchanging 46 connecting side of C phase mesolow output port and being respectively equipped with several gears, the voltage
Tap includes 400V gear, 480V gear, 690V gear, 900V gear and 1140V gear, when the voltage of inverter circuit output
When having floating, then the gear by adjusting different voltage taps is adjusted, and makes the voltage 380V of output, no longer superfluous herein
It states.
In embodiments of the present invention, AC three-phase load automatic-balancing system includes A phase sample circuit 4, B phase sample circuit
5, C phase sample circuit 6, signal conversion and rectification circuit 7, single-chip microcontroller 8, relay assembly circuit 9 and first contactor, second
Contactor and third contactor；Signal conversion and rectification circuit 7 connect single-chip microcontroller 8, and single-chip microcontroller 8 connects relay assembly circuit 9,
First contactor includes the first contact-making switch 13 and the first hot-wire coil 14, and second contactor includes the second contact-making switch 15 and the
Two hot-wire coils 16, third contactor include third contact-making switch 17 and third hot-wire coil 18；First hot-wire coil 14 and
The connection of one relay switch 10, the second hot-wire coil 16 are connect with the second relay switch 11, third hot-wire coil 18 and third
Relay switch 12 connects, and single-chip microcontroller 8 is for being monitored each road phases line voltage, and it is most light that customer charge is switched to load
Phase line on, realize to the autobalance of three-phase load, quick cut phase, while transformer burns thing caused by also reducing because of inclined phase
Therefore；
Meanwhile alternating voltage automatic voltage regulation system includes step-up transformer 39, rectification circuit 40 and inverter circuit；Boosting becomes
The input terminal of depressor 39 is equipped with exchange A phase input port 41, alternating-current B phase input port 42, exchange C phase input port 43, exchange A
Phase mesolow output port 44, alternating-current B phase mesolow output port 45 and exchange C phase mesolow output port 46；Rectification circuit
40 include that the first rectification branch circuit 47, second rectifies branch circuit 48 and third rectification branch circuit 49, the first rectification branch
Circuit 47 is connect with exchange A phase mesolow output port 44, the second rectification branch circuit 48 and alternating-current B phase mesolow output port
45 connections, third rectify branch circuit 49 and connect with exchange C phase mesolow output port 46；Inverter circuit is connected to the rectification
The output end of circuit 40, inverter circuit include the first inversion branch circuit 50, the second inversion branch circuit 51 and third inverse variation
Branch circuit 64, the first inversion branch circuit 50 are connect with 380V exchange A phase output terminal mouth, the second inversion branch circuit 51 and 380V
The connection of alternating-current B phase output terminal mouth, third inversion branch circuit 64 are connect with 380V exchange C phase output terminal mouth, and inverter circuit is stablized
It is that electrical equipment provides 380V alternating supply voltage, realizes the stabilization to voltage, while reducing line loss, improve
Power supply quality.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (9)
1. a kind of low voltage electric network utility power quality control system, which is characterized in that the low voltage electric network utility power quality control system packet
Include AC three-phase load automatic-balancing system and alternating voltage automatic voltage regulation system；
The AC three-phase load automatic-balancing system includes accessing the A phase sample circuit of A phase line by the first access point, passing through
Second access point accesses the B phase sample circuit of B phase line and accesses the C phase sample circuit of C phase line by third access point；
The output end of the A phase sample circuit, B phase sample circuit and C phase sample circuit is all connected with signal conversion and rectification circuit,
The signal conversion is connected with rectification circuit carries out voltage monitoring to A phase line, B phase line and C phase line and for controlling switching respectively
The single-chip microcontroller of phase line, the single-chip microcontroller connect relay assembly circuit, and the relay assembly circuit includes that the first relay is opened
Pass, the second relay switch and third relay switch；
The AC three-phase load automatic-balancing system further includes first contactor, second contactor and third contactor, described
First contactor includes the first contact-making switch and the first hot-wire coil, and the second contactor includes the second contact-making switch and second
Hot-wire coil, the third contactor include third contact-making switch and third hot-wire coil；
First contact-making switch is mounted in the A phase line in first access point downstream, and second contact is opened
Pass is mounted in the B phase line in second access point downstream, and the third contact-making switch is mounted on described the
In the C phase line in three access point downstreams；
First hot-wire coil is connect with first relay switch, second hot-wire coil and second relay
Switch connection, the third hot-wire coil are connect with the third relay switch；
Alternating voltage automatic voltage regulation system includes step-up transformer, rectification circuit and inverter circuit；
The input terminal of the step-up transformer is equipped with exchange A phase input port, alternating-current B phase input port, exchange C phase input terminal
Mouth exchanges A phase mesolow output port, alternating-current B phase mesolow output port and exchanges C phase mesolow output port；
The rectification circuit includes that the first rectification branch circuit, the second rectification branch circuit and third rectify branch circuit, described
First rectification branch circuit is connect with the exchange A phase mesolow output port, the second rectification branch circuit and the friendship
The connection of B phase mesolow output port is flowed, the third rectification branch circuit is connect with the exchange C phase mesolow output port；
The inverter circuit is connected to the output end of the rectification circuit, the inverter circuit include the first inversion branch circuit,
Second inversion branch circuit and third inversion branch circuit, the first inversion branch circuit exchange A phase output terminal mouth with 380V
Connection, the second inversion branch circuit are connect with 380V alternating-current B phase output terminal mouth, the third inversion branch circuit and 380V
Exchange the connection of C phase output terminal mouth；
First relay switch, the second relay switch and third relay switch are single-pole double-throw switch (SPDT)；
The relay assembly circuit includes relay interlocking control circuit；
The relay interlocking control circuit includes power access end, the first wiring section, the second wiring section and third wiring section；
Described first wiring section one end is connect with first hot-wire coil, and the other end is equipped with the first contact；
Described second wiring section one end is connect with second hot-wire coil, and the other end is equipped with the second contact；
Described third wiring section one end is connect with the third hot-wire coil, and the other end is equipped with third contact；
The 4th wiring section is equipped between first relay switch and second relay switch, the 4th wiring section
One end is connect with the stationary contact of first relay switch, and the other end is equipped with the 4th contact；
The 5th wiring section is equipped between second relay switch and the third relay switch, the 5th wiring section
One end is connect with the stationary contact of second relay, and the other end is equipped with the 5th contact, the dynamic touching of second relay switch
Point is fastened on the 4th contact or the second contact；
The stationary contact of the third relay switch is connect with the power access end, the movable contact of the third relay switch
It is fastened on the 5th contact or third contact.
2. low voltage electric network utility power quality control system according to claim 1, which is characterized in that first contact is institute
The normally-closed contact of the first relay switch is stated, second contact is the normally opened contact of second relay, the 4th touching
Point is the normally-closed contact of second relay, and the third contact is the normally opened contact of the third relay switch, described
5th contact is the normally-closed contact of the third relay switch.
3. low voltage electric network utility power quality control system according to claim 1, which is characterized in that the AC three-phase load
Automatic-balancing system further includes contactor interlocking control circuit；
The contactor interlocking control circuit include be connected between phase line and the neutral conductor and the first via parallel with one another interlocking electricity
Road, No. second interlock circuit and third road interlock circuit；
The first contactor, second contactor and third contactor further include that the first auxiliary contactor switch and the second auxiliary connect
Touching switch；
The first via interlock circuit includes the first relay switch being sequentially connected in series between the phase line and the neutral conductor, second
First auxiliary contactor switch of contactor, the first auxiliary contactor switch of third contactor and the first hot-wire coil；
No. second interlock circuit includes the second relay switch being sequentially connected in series between the phase line and the neutral conductor, first
First auxiliary contactor switch of contactor, the second auxiliary contactor switch of third contactor and the second hot-wire coil；
Third road interlock circuit includes the third relay switch being sequentially connected in series between the phase line and the neutral conductor, first
Second auxiliary contactor switch of contactor, the second auxiliary contactor switch of second contactor and third hot-wire coil.
4. low voltage electric network utility power quality control system according to claim 1, which is characterized in that first rectification branch
Circuit, the second rectification branch circuit and third rectification branch circuit are made of two first crystal diodes.
5. low voltage electric network utility power quality control system according to claim 1, which is characterized in that first inversion branch
Circuit, the second inversion branch circuit and third inversion branch circuit include the first intelligent power module electricity being cascaded
Road and the second Intelligent power module circuit；
Line between the first Intelligent power module circuit and the second Intelligent power module circuit of the first inversion branch circuit
The connection of extraction to the 380V exchange A phase output terminal mouth；
Line between the first Intelligent power module circuit and the second Intelligent power module circuit of the second inversion branch circuit
The connection of extraction is to the 380V alternating-current B phase output terminal mouth；
Line between the first Intelligent power module circuit and the second Intelligent power module circuit of the third inversion branch circuit
The connection of extraction to the 380V exchange C phase output terminal mouth.
6. low voltage electric network utility power quality control system according to claim 5, which is characterized in that first intelligent power
Modular circuit and the second Intelligent power module circuit include insulated gate bipolar transistor and the second crystal diode, wherein：
The rectified current is connected in parallel on after first Intelligent power module circuit and second Intelligent power module circuit concatenation
The both ends on road；
The collector of the insulated gate bipolar transistor of first Intelligent power module circuit and second intelligent power module
The connection that line between the emitter of the insulated gate bipolar transistor of circuit is drawn exchanges A phase output terminal to the 380V
Mouth or 380V alternating-current B phase output terminal mouth or 380V exchange C phase output terminal mouth.
7. low voltage electric network utility power quality control system according to claim 1, which is characterized in that the alternating voltage is automatic
Voltage-stabilizing system further includes the first filter circuit positioned at the inverter circuit front end, first filter circuit and in the rectification
The both ends of circuit；
First filter circuit is composed in parallel by 2 condenser networks, and the condenser network includes several concatenated capacitors；
The alternating voltage automatic voltage regulation system further includes the second filter circuit positioned at first filter circuit front end, described
Second filter circuit is serially connected between the rectification circuit and first filter circuit, and second filter circuit includes first
Inductor.
8. low voltage electric network utility power quality control system according to claim 1, which is characterized in that the 380V exchanges A phase
The front end of output port, 380V alternating-current B phase output terminal mouth and 380V exchange C phase output terminal mouth is respectively equipped with second inductance
Device.
9. low voltage electric network utility power quality control system according to claim 1, which is characterized in that the step-up transformer is used
To connect with A phase mesolow output port, alternating-current B phase mesolow output port and the exchange C phase mesolow output port of exchanging
Connect the voltage tap that side is respectively equipped with several gears, the voltage tap include 400V gear, 480V gear, 690V gear,
900V gear and 1140V gear.
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| CN201610719260.3A CN106130047B (en) | 2016-08-25 | 2016-08-25 | A kind of low voltage electric network utility power quality control system |
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| CN201610719260.3A CN106130047B (en) | 2016-08-25 | 2016-08-25 | A kind of low voltage electric network utility power quality control system |
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| CN106130047B true CN106130047B (en) | 2018-11-30 |
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