CN206023236U - A kind of low voltage electric network utility power quality control system - Google Patents

Abstract

The utility model is related to low voltage power transmission technical field, 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 microcomputer in AC three-phase load automatic-balancing system is monitored to 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, also reduce the transformer burnout failure because mutually causing partially simultaneously, simultaneously, what the inverter circuit of alternating voltage automatic voltage regulation system was stable provides 380V alternating supply voltages for electrical equipment, realize the stabilization to voltage, line loss is reduced simultaneously, improve power supply quality.

Description

A kind of low voltage electric network utility power quality control system

Technical field

The utility model belongs to low voltage power transmission technical field, more particularly to a kind of low voltage electric network utility power quality control system.

Background technology

An important evaluation index of the voltage as the quality of power supply, is the primary condition for ensureing electric service, is related to confession Power quality and the ability of service socio-economic development.In recent years, the economic sustainable and stable development of Chinese society, urban and rural residents are consumed Level is improved constantly, and particularly 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 subregion low, can not be fine Meet industrial and agricultural production and urban residents' household electricity demand.

Power distribution network causes agriculture the characteristics of especially there is rural power grids many, line length of point, wide, load, electricity consumption to concentrate Village's voltage chronicity is unstable.The randomness of rural electricity consumption load, seasonality, periodic feature are obvious.Voltage during electricity consumption ebb Height, peak of power consumption period low-voltage outstanding problem, causing part household electrical appliance normally cannot use.

Spread of voltage, the problem of three-phase imbalance can also reduce electric equipment except the normal electricity consumption of impact user Service efficiency and economic benefit, affect normal operation and the product quality of production equipment, increase grid power loss and electric energy is damaged Consumption, jeopardizes power system and the safe operation of electricity supply and use equipment.

Utility model content

The purpose of this utility model is to provide a kind of low voltage electric network utility power quality control system, it is intended to solve prior art , except the normal electricity consumption of impact user, can also reduce electric equipment uses effect for middle spread of voltage, the problem of three-phase imbalance Rate and economic benefit, affect normal operation and the product quality of production equipment, increase grid power loss and electric energy loss, jeopardize Power system and the problem of the safe operation of electricity supply and use equipment.

The utility model is achieved in that a kind of low voltage electric network utility power quality control system, the low voltage electric network electric energy 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 lines A phase sampler circuits, The C phase sampler circuits of C phase lines are accessed by the B phase samplers circuit of the second access point access B phase lines and by the 3rd access point；

The output end of the A phase samplers circuit, B phase samplers circuit and C phase sampler circuits is all connected with signal conversion and rectification Circuit, the signal conversion and rectification circuit connection carry out voltage monitoring respectively and are used for controlling to A phase lines, B phase lines and C phase lines The single-chip microcomputer of switching phase line, the single-chip microcomputer connect relay assembly circuit, and the relay assembly circuit includes the first relay Device switch, the second relay switch and the 3rd relay switch；

The AC three-phase load automatic-balancing system also includes first contactor, second contactor and the 3rd contactor, The first contactor includes 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 3rd contactor include the 3rd contact-making switch and the 3rd hot-wire coil；

First contact-making switch is mounted in the A phase lines in the first access point downstream, and described second connects Tactile switch is mounted in the B phase lines in the second access point downstream, and the 3rd contact-making switch is mounted on institute State in the C phase lines in the 3rd access point downstream；

First hot-wire coil is connected with first relay switch, second hot-wire coil with described second after Electric switch connects, and the 3rd hot-wire coil is connected with the 3rd relay switch；

Alternating voltage automatic voltage regulation system includes step-up transformer, rectification circuit and inverter circuit；

The input of the step-up transformer is provided with exchange A phase input ports, alternating-current B phase input port, exchange C phases and is input into Port, exchange A phase mesolow output ports, alternating-current B phase mesolow output port and exchange C phase mesolow output ports；

The rectification circuit includes the first rectification branch circuit, the second rectification branch circuit and the 3rd rectification branch circuit, The first rectification branch circuit is connected with the exchange A phase mesolow output ports, the second rectification branch circuit and institute The connection of alternating-current B phase mesolow output port is stated, the 3rd rectification branch circuit exchanges C phase mesolows output port company with described Connect；

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 the 3rd inversion branch circuit, the first inversion branch circuit exchange A phase output terminals with 380V Mouthful connection, the second inversion branch circuit is connected with 380V alternating-current B phase output terminal mouths, the 3rd inversion branch circuit and 380V exchange C phase output terminals mouth connections.

As a kind of improved plan, first relay switch, the second relay switch and the 3rd relay switch It is 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 the 3rd connect Line segment；

Described first wiring section one end is connected with first hot-wire coil, and the other end is provided with the first contact；

Described second wiring section one end is connected with second hot-wire coil, and the other end is provided with the second contact；

Described 3rd wiring section one end is connected with the 3rd hot-wire coil, and the other end is provided with the 3rd contact；

The 4th wiring section, the 4th wiring is provided between first relay switch and second relay switch One end of section is connected with the stationary contact of first relay switch, and the other end is provided with the 4th contact；

The 5th wiring section is provided between second relay switch and the 3rd relay switch, the 5th wiring One end of section is connected with the stationary contact of second relay, and the other end is provided with the 5th contact, second relay switch Movable contact is fastened on the 4th contact or the second contact；

The stationary contact of the 3rd relay switch is connected with the power access end, the 3rd relay switch dynamic Contact is fastened on the 5th contact or the 3rd contact.

Used as a kind of improved plan, first contact is the normally-closed contact of first relay switch, described Two contacts are the normally opened contact of second relay, and the 4th contact is the normally-closed contact of second relay, described 3rd contact is the normally opened contact of the 3rd relay switch, and the 5th contact is the normally closed of the 3rd relay switch Contact.

Used as a kind of improved plan, the AC three-phase load automatic-balancing system also includes 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 No. threeth interlock circuit；

The first contactor, second contactor and the 3rd contactor also include the first auxiliary contactor switch and second auxiliary Help contact-making switch；

The first relay switch that the first via interlock circuit includes 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 the 3rd contactor and the first hot-wire coil；

The second relay switch that No. second interlock circuit includes 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 the 3rd contactor and the second hot-wire coil；

No. threeth interlock circuit includes that the 3rd relay being sequentially connected in series between the phase line and the neutral conductor is opened Pass, the second auxiliary contactor switch of first contactor, the second auxiliary contactor switch of second contactor and the 3rd hot-wire coil.

As a kind of improved plan, the first rectification branch circuit, the second rectification branch circuit and the 3rd rectification point Prop up circuit to be constituted by two first crystal diodes.

As a kind of improved plan, the first inversion branch circuit, the second inversion branch circuit and the 3rd inversion Branch circuit includes the first Intelligent power module circuit being cascaded and the second Intelligent power module circuit；

Between first Intelligent power module circuit and the second Intelligent power module circuit of the first inversion branch circuit The connection that line is drawn exchanges A phase output terminal mouths to the 380V；

Between 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 Bs phase output terminal mouth；

Between first Intelligent power module circuit and the second Intelligent power module circuit of the 3rd inversion branch circuit The connection that line is drawn exchanges C phase output terminal mouths to the 380V.

Used as a kind of improved plan, first Intelligent power module circuit and the second Intelligent power module circuit are wrapped Igbt and the second crystal diode is included, wherein：

After the igbt of first Intelligent power module circuit is in parallel with second crystal diode It is serially connected in the two ends of the rectification circuit；

The colelctor electrode of the igbt of first Intelligent power module circuit and second intelligent power The connection that line between the emitter stage of the igbt of modular circuit is drawn is defeated to 380V exchanges A phases Exit port, or 380V alternating-current B phase output terminal mouths, or 380V exchange C phase output terminal mouths.

Used as a kind of improved plan, the alternating voltage automatic voltage regulation system is also included positioned at the inverter circuit front end The first filter circuit, first filter circuit the two ends in the rectification circuit；

First filter circuit is composed in parallel by 2 condenser networks, and the condenser network includes several electricity that connects Hold；

The alternating voltage automatic voltage regulation system also includes the second filter circuit positioned at the first filter circuit front end, Second filter circuit at the rectification circuit two ends, second filter circuit includes the first inductor.

As a kind of improved plan, the 380V exchanges A phase output terminal mouths, 380V alternating-current B phase output terminal mouths and The front end of 380V exchange C phase output terminal mouths is respectively equipped with second inductor.

Used as a kind of improved plan, the step-up transformer is used for exchanging A phase mesolow output ports, exchange with described B phase mesolows output port is respectively equipped with the voltage tap of some gears with C phase mesolow output port connecting sides are exchanged, described Voltage tap includes 400V gears, 480V gears, 690V gears, 900V gears and 1140V gears.

In the utility model embodiment, low voltage electric network utility power quality control system includes AC three-phase load autobalance System and alternating voltage automatic voltage regulation system, wherein：

AC three-phase load automatic-balancing system includes A phase sampler circuits, B phase sampler circuits, C phase sampler circuits, rectification Circuit, single-chip microcomputer, relay assembly circuit and first contactor, second contactor and the 3rd contactor；Rectification circuit connects Single-chip microcomputer, single-chip microcomputer connect relay assembly circuit, and first contactor includes the first contact-making switch and the first hot-wire coil, and second Contactor includes that the second contact-making switch and the second hot-wire coil, the 3rd contactor include the 3rd contact-making switch and the 3rd live wire Circle；First hot-wire coil is connected with the first relay switch, and the second hot-wire coil is connected with the second relay switch, and the 3rd is powered Coil is connected with the 3rd relay switch, and single-chip microcomputer is used for being monitored each road phases line voltage, and customer charge is switched to In the most light phase line of load, the autobalance to three-phase load, quick cut is realized, while also reducing the transformation because mutually causing partially Device burnout failure；

Alternating voltage automatic voltage regulation system includes step-up transformer, rectification circuit and inverter circuit；Step-up transformer defeated Enter end and be provided with exchange A phase input ports, alternating-current B phase input port, exchange C phase input ports, exchange A phase mesolow output ends Mouthful, alternating-current B phase mesolow output port with exchange C phase mesolow output ports；Rectification circuit include the first rectification branch circuit, Second rectification branch circuit and the 3rd rectification branch circuit, the first rectification branch circuit connect with A phase mesolows output port is exchanged Connect, the second rectification branch circuit is connected with alternating-current B phase mesolow output port, the 3rd rectification branch circuit with exchange low in C phases Pressure 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 the 3rd inversion branch circuit, the first inversion branch circuit exchange A phase output terminals mouth company with 380V Connect, the second inversion branch circuit is connected with 380V alternating-current B phase output terminal mouths, and it is defeated that the 3rd inversion branch circuit exchanges C phases with 380V Exit port connects, the stable stabilization for providing 380V alternating supply voltages for electrical equipment, realizing to voltage of inverter circuit, Reduce line loss simultaneously, improve power supply quality.

Due to the setting of relay interlocking control circuit and contactor interlocking control circuit, whole AC three-phase load is made certainly The quick cut of dynamic balance system safety and steady, it is to avoid the security incident that phase short-circuit between conductors is caused.

Description of the drawings

Fig. 1 is the structural representation of the AC three-phase load automatic-balancing system that the utility model is provided；

Fig. 2 is the structural representation of the relay interlocking control circuit that the utility model is provided；

Fig. 3 is the structural representation of the contactor interlocking control circuit that the utility model is provided；

Fig. 4 is the structural representation of the alternating voltage automatic voltage regulation system that the utility model is provided；

Wherein, the first access points of 1-, the second access points of 2-, the 3rd access points of 3-, 4-A phase sampler circuits, 5-B phase samplers electricity Road, 6-C phase sampler circuits, the conversion of 7- signals and rectification circuit, 8- single-chip microcomputers, 9- relay assembly circuits, the first relays of 10- Switch, the second relay switches of 11-, the 3rd relay switches of 12-, the first contact-making switches of 13-, the first hot-wire coils of 14-, 15- Second contact-making switch, the second hot-wire coils of 16-, the 3rd contact-making switches of 17-, the 3rd hot-wire coils of 18-, 19- power access ends, 20- the first wiring sections, 21- the second wiring sections, the 3rd wiring sections of 22-, the first contacts of 23-, the second contacts of 24-, 25- the 3rd are touched Point, the 4th wiring sections of 26-, the 4th contacts of 27-, the 5th wiring sections of 28-, the 5th contacts of 29-, 30- first via interlock circuits, 31- No. second interlock circuit, 32- No. threeth interlock circuits, the first auxiliary contactor switch of 33- first contactors, 34- first are contacted Second auxiliary contactor switch of device, the first auxiliary contactor switch of 35- second contactors, the second auxiliary of 36- second contactors Contact-making switch, the first auxiliary contactor switch of the 3rd contactors of 37-, the second auxiliary contactor switch of the 3rd contactors of 38-, 39- Step-up transformer, 40- rectification circuits, 41- exchange A phase input ports, and 42- alternating-current B phase input ports, 43- exchange C phase inputs Mouthful, 44- exchanges A phase mesolow output ports, and 45- alternating-current B phase mesolow output ports, 46- exchange C phase mesolow output ends Mouthful, 47- the first rectification branch circuits, 48- the second rectification branch circuits, the 3rd rectification branch circuits of 49-, the first inverse variations of 50- Circuit, 51- the second inversion branch circuits, the first Intelligent power module circuits of 52-, the second Intelligent power module circuits of 53-, 54- igbts, the second crystal diodes of 55-, the first filter circuits of 56-, the second filter circuits of 57-, 58- electricity Hold, the first inductors of 59-, the second inductors of 60-, 61-380V exchange A phase output terminal mouths, 62-380V alternating-current B phase output terminal mouths, 63-380V exchanges C phase output terminal mouths, the 3rd inversion branch circuits of 64-.

Specific embodiment

In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing and enforcement Example, is further elaborated to the utility model.It should be appreciated that specific embodiment described herein is only in order to explaining The utility model, is not used to limit the utility model.

Fig. 1 shows the structural representation of the AC three-phase load automatic-balancing system that the utility model is provided, in order to just The part related to the utility model is only gived in explanation, figure.

AC three-phase load automatic-balancing system includes being accessed the A phase samplers circuit 4 of A phase lines, being led to by the first access point 1 Cross the second access point 2 to access the B phase samplers circuit 5 of B phase lines and access the C phase samplers circuit 6 of C phase lines by the 3rd access point 3；

The output end of A phase samplers circuit 4, B phase samplers circuit 5 and C phase samplers circuit 6 is all connected with signal conversion and rectified current Road 7, signal conversion and rectification circuit 7 connect carries out voltage monitoring respectively and for control switching to A phase lines, B phase lines and C phase lines The single-chip microcomputer 8 of phase line, the connection of single-chip microcomputer 8 relay assembly circuit 9, relay assembly circuit 9 include the first relay switch 10, Second relay switch 11 and the 3rd relay switch 12；

AC three-phase load automatic-balancing system also includes first contactor, second contactor and the 3rd contactor, first Contactor includes that the first contact-making switch 13 and the first hot-wire coil 14, second contactor include that the second contact-making switch 15 and second is logical Electric coil 16, the 3rd contactor include the 3rd contact-making switch 17 and the 3rd hot-wire coil 18；

First contact-making switch 13 is mounted in the A phase lines in 1 downstream of the first access point, and the second contact-making switch 15 is arranged on It is located in the B phase lines in the second access point downstream, the 3rd contact-making switch 17 is mounted in the C phase lines in the 3rd access point downstream；

First hot-wire coil 14 is connected with the first relay switch 10, the second hot-wire coil 16 and the second relay switch 11 Connection, the 3rd hot-wire coil 18 are connected with the 3rd relay switch 12.

Wherein, above-mentioned A phase samplers circuit 4, B phase samplers circuit 5 and C phase samplers circuit 6 are constituted by transformer, and which is main For being acquired to the voltage in corresponding phase line, electric current, and send the voltage for collecting to signal conversion and rectification circuit 7, then transfer to single-chip microcomputer 8 to be timed monitoring again, continue to monitor a period of time, and to this each phase line of a period of time of past Magnitude of voltage is calculated, and controls the use phase line of electrical equipment is switched in the most light phase line of load, for transformer Attachment structure, will not be described here.

It is for a period of time 24 hours that this continues to monitor, the state that can typically embody power load in phase line in 24 hours.

In this embodiment, the first relay switch 10, the second relay switch 11 and the 3rd relay switch 12 are Single-pole double-throw switch (SPDT), makes whole circuit structure simple, handling strong.

In the utility model embodiment, in above-mentioned relay assembly circuit 9, also include relay interlocking control circuit, The relay interlocking control circuit is used for the security to ensureing cut, i.e., before power load to be switched to next phase line, Circuitry cuts state is guaranteed in two other phase line.

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 the 3rd wiring section 22；

First wiring section, 20 one end is connected with the first hot-wire coil 14, and the other end is provided with the first contact 23；

Second wiring section, 21 one end is connected with the second hot-wire coil 16, and the other end is provided with the second contact 24；

3rd wiring section, 22 one end is connected with the 3rd hot-wire coil 18, and the other end is provided with the 3rd contact 25；

The 4th wiring section 26 is provided between first relay switch 10 and the second relay switch 11, the 4th wiring section 26 One end is connected with the stationary contact of the first relay switch 10, and the other end is provided with the 4th contact 27；

The 5th wiring section 28 is provided between second relay switch 11 and the 3rd relay switch 12, the 5th wiring section 28 One end is connected with the stationary contact of the second relay, and the other end is provided with the 5th contact 29, the movable contact button of the second relay switch 11 Close on the 4th contact 27 or the second contact 24；

The stationary contact of the 3rd relay switch 12 is connected with power access end 19, the movable contact button of the 3rd relay switch 12 Close on the 5th contact 29 or the 3rd 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, second touches Normally opened contact of the point 24 for the second relay, normally-closed contact of the 4th contact 27 for the second relay, the 3rd contact 25 is the 3rd The normally opened contact of relay switch 12, normally-closed contact of the 5th contact 29 for the 3rd relay switch 12.

In the utility model embodiment, AC three-phase load automatic-balancing system also includes contactor interlocking control electricity Road, the contactor interlocking control circuit be used for ensure cut security, i.e., by power load be switched to next phase line it Before, circuitry cuts state is guaranteed in two other phase line, i.e., regardless of the state of relay switch, cut all in circuit Disconnected 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 No. threeth interlock circuit 32 all the way；

Wherein, first contactor, second contactor and the 3rd contactor also 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 the 3rd 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 the 3rd contactor and the second hot-wire coil 16；

No. threeth interlock circuit 32 includes the 3rd relay switch 12, first being sequentially connected in series between phase line and the neutral conductor Second auxiliary contactor switch 36 and the 3rd hot-wire coil 18 of the second auxiliary contactor switch 34, second contactor of contactor.

For convenience of description, the operation principle of contactor interlocking control circuit is illustrated in conjunction with Fig. 3：

Current power load is assumed on first via interlock circuit 30, through the monitoring that single-chip microcomputer 8 continues 24 hours, judge phase Line B is the most light phase line of load in three-phase, accordingly, it would be desirable to control power load is switched in phase line B, now, single-chip microcomputer 8 is given First relay switch sends open command, sends close command to the second relay switch；

First relay switch disconnects, and the second relay switch is closed, while the first auxiliary for controlling second contactor connects Touch switch, the second auxiliary contactor switch and be in off-state, and the first auxiliary contactor switch the 33, the 3rd of first contactor connects Second auxiliary contactor switch of tentaculum is in closure state, and now, No. second interlock circuit is in "on" position；

Electricity on second hot-wire coil 16 of second contactor, the second contact-making switch of adhesive 15 close, power load are switched To in 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 of the step-up transformer 39 is provided with exchange A phases input port 41, alternating-current B phase input port 42, exchange C Phase input port 43, exchange A phase mesolows output port 44, alternating-current B phase mesolow output port 45 are with to exchange C phase mesolows defeated Exit port 46；

The rectification circuit 40 includes the first rectification branch circuit 47, the second rectification branch circuit 48 and the 3rd rectification branch Circuit 49, the first rectification branch circuit 47 are connected with the exchange A phase mesolows output port 44, second rectification point Prop up circuit 48 to be connected with the alternating-current B phase mesolow output port 45, the 3rd rectification branch circuit 49 exchanges C phases 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 the 3rd inversion branch circuit 64, the first inversion branch circuit 50 are handed over 380V Stream A phase output terminals mouth 61 connects, and the second inversion branch circuit 51 is connected with 380V alternating-current B phase output terminals mouth 62, and described the Three inversion branch circuits 64 are connected with 380V exchange C phase output terminals mouth 63.

Wherein, the voltage that above-mentioned step-up transformer 39 is mainly used in conveying transformer lifts 400-1140V from 380V Scope, then by rectification circuit 40 by AC rectification be direct current, then the direct current that rectification is obtained is delivered to inverse Becoming device carries out inversion again into meeting the 380V alternating currents of electrical equipment demand, and stably exports.

In the utility model embodiment, the first rectification branch circuit 47, the second rectification branch circuit 48 and the 3rd rectification Branch circuit 49 is constituted by two first crystal diodes.

As shown in figure 4, the first inversion branch circuit 50, the second inversion branch circuit 51 and the 3rd inversion branch circuit 64 Include the first Intelligent power module circuit 52 and the second Intelligent power module circuit 53 being cascaded；

First Intelligent power module circuit 52 and the second Intelligent power module circuit of the first inversion branch circuit 50 The connection that line is drawn between 53 is to 380V exchange A phase output terminals mouth 61；

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 Bs phase output terminal mouth 62；

First Intelligent power module circuit 52 and the second Intelligent power module circuit of the 3rd inversion branch circuit 64 The connection that line is drawn between 53 is to 380V exchange C phase output terminals 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：

The igbt 54 of first Intelligent power module circuit 52 and second crystal diode 55 The two ends of the rectification circuit 40 are serially connected in after parallel connection；

The colelctor electrode of the igbt 54 of first Intelligent power module circuit 52 and the described second intelligence The connection that line between the emitter stage of the igbt 54 of power module circuit 53 is drawn is to the 380V Exchange A phase output terminals mouth 61, or 380V alternating-current B phase output terminals mouth 62, or 380V exchange C phase output terminals mouth 63.

In the utility model embodiment, filter circuit is set in 40 rear end side of rectification circuit, wherein, the filter circuit can To include the first filter circuit 56 and the second filter circuit 57, specially：

Alternating voltage automatic voltage regulation system also includes the first filter circuit 56 positioned at the inverter circuit front end, described One filter circuit 56 two ends in the rectification circuit 40；

First filter circuit 56 is composed in parallel by 2 condenser networks, and the condenser network includes several electric capacity that connects 58.

Meanwhile, alternating voltage automatic voltage regulation system also includes the second filtered electrical positioned at 56 front end of the first filter circuit Road 57, second filter circuit 57 at 40 two ends of the rectification circuit, second filter circuit 57 includes the first inductance Device 59.

In the utility model embodiment, 380V exchange A phase output terminals mouth 61,380V alternating-current B phase output terminals mouth 62 and The front end of 380V exchange C phase output terminals mouth 63 is respectively equipped with second inductor 60, and the setting of second inductor 60 is to inverse The signal for becoming circuit output is adjusted so as to more meets sine waveform, will not be described here.

As shown in figure 4, step-up transformer 4 is used for exchanging A phase mesolows output port 44, alternating-current B phase mesolow with described Output port 45 is respectively equipped with the voltage tap of some gears, the voltage with 46 connecting side of C phase mesolows output port is exchanged Tap includes 400V gears, 480V gears, 690V gears, 900V gears and 1140V gears, when the voltage of inverter circuit output When having floating, then it is adjusted by adjusting the gear of different voltage taps, the voltage for making output is 380V, here is no longer gone to live in the household of one's in-laws on getting married State.

In the utility model embodiment, AC three-phase load automatic-balancing system includes A phase samplers circuit 4, B phase samplers Circuit 5, the conversion of C phase samplers circuit 6, signal and rectification circuit 7, single-chip microcomputer 8, relay assembly circuit 9 and first contactor, Second contactor and the 3rd contactor；Signal conversion and rectification circuit 7 connect single-chip microcomputer 8, the connection relay assembly electricity of single-chip microcomputer 8 Road 9, first contactor include that the first contact-making switch 13 and the first hot-wire coil 14, second contactor include the second contact-making switch 15 With the second hot-wire coil 16, the 3rd contactor includes the 3rd contact-making switch 17 and the 3rd hot-wire coil 18；First hot-wire coil 14 Be connected with the first relay switch 10, the second hot-wire coil 16 is connected with the second relay switch 11, the 3rd hot-wire coil 18 with 3rd relay switch 12 connects, and single-chip microcomputer 8 is used for being monitored each road phases line voltage, and customer charge is switched to load In most light phase line, the autobalance to three-phase load, quick cut is realized, while also reducing burning because of the transformer for mutually causing partially Ruin accident；

Meanwhile, alternating voltage automatic voltage regulation system includes step-up transformer 39, rectification circuit 40 and inverter circuit；Rise buckling The input of depressor 39 is provided with exchange A phases input port 41, alternating-current B phase input port 42, exchange C phases input port 43, exchange A Phase mesolow output port 44, alternating-current B phase mesolow output port 45 with exchange C phase mesolows output port 46；Rectification circuit 40 include the first rectification branch circuit 47, the second rectification branch circuit 48 and the 3rd rectification branch circuit 49, the first rectification branch Circuit 47 is connected with exchange A phase mesolows output port 44, the second rectification branch circuit 48 and alternating-current B phase mesolow output port 45 connections, the 3rd rectification branch circuit 49 are connected with exchange C phase mesolows output port 46；Inverter circuit is connected to described whole The output end of current circuit 40, inverter circuit include the first inversion branch circuit 50, the second inversion branch circuit 51 and the 3rd inversion Branch circuit 64, the first inversion branch circuit 50 and 380V exchange A phase output terminal mouths be connecteds, the second inversion branch circuit 51 and 380V alternating-current B phase output terminals mouth connects, and the 3rd inversion branch circuit 64 is connected with 380V exchange C phase output terminal mouths, inverter circuit The stable stabilization for providing 380V alternating supply voltages for electrical equipment, realizing to voltage, while line loss is reduced, Improve power supply quality.

Preferred embodiment of the present utility model is the foregoing is only, not in order to limit the utility model, all at this Any modification, equivalent and improvement that is made within the spirit and principle of utility model etc., should be included in the utility model Protection domain within.

Claims (10)

1. a kind of low voltage electric network utility power quality control system, it is characterised in that the low voltage electric network utility power quality control system bag Include AC three-phase load automatic-balancing system and alternating voltage automatic voltage regulation system；

The AC three-phase load automatic-balancing system includes being accessed the A phase sampler circuits of A phase lines, being passed through by the first access point Second access point is accessed the B phase samplers circuit of B phase lines and is accessed the C phase sampler circuits of C phase lines by the 3rd access point；

The output end of the A phase samplers circuit, B phase samplers circuit and C phase sampler circuits is all connected with signal conversion and rectification circuit, The signal conversion and rectification circuit connection carry out voltage monitoring respectively and for control switching to A phase lines, B phase lines and C phase lines The single-chip microcomputer of phase line, the single-chip microcomputer connect relay assembly circuit, and the relay assembly circuit includes that the first relay is opened Pass, the second relay switch and the 3rd relay switch；

The AC three-phase load automatic-balancing system also includes first contactor, second contactor and the 3rd contactor, described First contactor includes that 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 3rd contactor include the 3rd contact-making switch and the 3rd hot-wire coil；

First contact-making switch is mounted in the A phase lines in the first access point downstream, and second contact is opened Close and be mounted in the B phase lines in the second access point downstream, the 3rd contact-making switch is mounted on described the In the C phase lines in three access point downstreams；

First hot-wire coil is connected with first relay switch, second hot-wire coil and second relay Switch connection, the 3rd hot-wire coil are connected with the 3rd relay switch；

Alternating voltage automatic voltage regulation system includes step-up transformer, rectification circuit and inverter circuit；

The input of the step-up transformer is provided with exchange A phase input ports, alternating-current B phase input port, exchange C phase inputs Mouthful, exchange A phase mesolow output ports, alternating-current B phase mesolow output port and exchange C phase mesolow output ports；

The rectification circuit includes the first rectification branch circuit, the second rectification branch circuit and the 3rd rectification branch circuit, described First rectification branch circuit is connected with the exchange A phase mesolow output ports, the second rectification branch circuit and the friendship The output port connection of stream B phase mesolows, the 3rd rectification branch circuit are connected with the exchange C phase mesolow output ports；

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 the 3rd inversion branch circuit, the first inversion branch circuit exchange A phase output terminal mouths with 380V Connection, the second inversion branch circuit is connected with 380V alternating-current B phase output terminal mouths, the 3rd inversion branch circuit and 380V The mouth connection of exchange C phase output terminals.

2. low voltage electric network utility power quality control system according to claim 1, it is characterised in that first relay is opened Close, the second relay switch and the 3rd 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 the 3rd wiring section；

Described first wiring section one end is connected with first hot-wire coil, and the other end is provided with the first contact；

Described second wiring section one end is connected with second hot-wire coil, and the other end is provided with the second contact；

Described 3rd wiring section one end is connected with the 3rd hot-wire coil, and the other end is provided with the 3rd contact；

The 4th wiring section is provided between first relay switch and second relay switch, the 4th wiring section One end is connected with the stationary contact of first relay switch, and the other end is provided with the 4th contact；

The 5th wiring section is provided between second relay switch and the 3rd relay switch, the 5th wiring section One end is connected with the stationary contact of second relay, and the other end is provided with the 5th contact, and the dynamic of second relay switch touches Point is fastened on the 4th contact or the second contact；

The stationary contact of the 3rd relay switch is connected with the power access end, the movable contact of the 3rd relay switch It is fastened on the 5th contact or the 3rd contact.

3. low voltage electric network utility power quality control system according to claim 2, it is characterised 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, and the described 4th touches Normally-closed contact of the point for second relay, the 3rd contact is the normally opened contact of the 3rd relay switch, described 5th contact is the normally-closed contact of the 3rd relay switch.

4. low voltage electric network utility power quality control system according to claim 1, it is characterised in that the AC three-phase load Automatic-balancing system also includes contactor interlocking control circuit；

The contactor interlocking control circuit includes being connected between phase line and the neutral conductor and the first via parallel with one another interlocking electricity Road, No. second interlock circuit and No. threeth interlock circuit；

The first contactor, second contactor and the 3rd contactor also include that the first auxiliary contactor switch and the second auxiliary connect Touch switch；

The first relay switch that the first via interlock circuit includes 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 the 3rd contactor and the first hot-wire coil；

The second relay switch that No. second interlock circuit includes 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 the 3rd contactor and the second hot-wire coil；

The 3rd relay switch that No. threeth interlock circuit includes 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 the 3rd hot-wire coil.

5. low voltage electric network utility power quality control system according to claim 1, it is characterised in that the first rectification branch Circuit, the second rectification branch circuit and the 3rd rectification branch circuit are constituted by two first crystal diodes.

6. low voltage electric network utility power quality control system according to claim 1, it is characterised in that the first inversion branch Circuit, the second inversion branch circuit and the 3rd inversion branch circuit include the first SPM electricity being cascaded Road and the second Intelligent power module circuit；

Line between first Intelligent power module circuit and the second Intelligent power module circuit of the first inversion branch circuit The connection of extraction exchanges A phase output terminal mouths to the 380V；

Line between 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 Bs phase output terminal mouth；

Line between first Intelligent power module circuit and the second Intelligent power module circuit of the 3rd inversion branch circuit The connection of extraction exchanges C phase output terminal mouths to the 380V.

7. low voltage electric network utility power quality control system according to claim 6, it is characterised in that first intelligent power Modular circuit and the second Intelligent power module circuit include igbt and the second crystal diode, wherein：

The igbt of first Intelligent power module circuit is concatenated with after second crystal diode parallel connection Two ends in the rectification circuit；

The colelctor electrode of the igbt of first Intelligent power module circuit and second SPM The connection that line between the emitter stage of the igbt of circuit is drawn exchanges A phase output terminals to the 380V Mouthful, or 380V alternating-current B phase output terminal mouths, or 380V exchange C phase output terminal mouths.

8. low voltage electric network utility power quality control system according to claim 1, it is characterised in that the alternating voltage is automatic Voltage-stabilizing system also includes the first filter circuit positioned at the inverter circuit front end, first filter circuit in the rectification The two ends of circuit；

First filter circuit is composed in parallel by 2 condenser networks, and the condenser network includes several electric capacity that connects；

The alternating voltage automatic voltage regulation system also includes the second filter circuit positioned at the first filter circuit front end, described Second filter circuit at the rectification circuit two ends, second filter circuit includes the first inductor.

9. low voltage electric network utility power quality control system according to claim 1, it is characterised in that the 380V exchanges A phases The front end of output port, 380V alternating-current B phase output terminal mouths and 380V exchange C phase output terminal mouths is respectively equipped with second inductance Device.

10. low voltage electric network utility power quality control system according to claim 1, it is characterised in that the step-up transformer It is used for exchanging A phase mesolow output ports, alternating-current B phase mesolow output port and exchange C phase mesolow output ports with described Connecting side is respectively equipped with the voltage tap of some gears, the voltage tap include 400V gears, 480V gears, 690V gears, 900V gears and 1140V gears.