CN2030392U - Reactive power supply unit using GTO - Google Patents
Reactive power supply unit using GTO Download PDFInfo
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- CN2030392U CN2030392U CN 88211404 CN88211404U CN2030392U CN 2030392 U CN2030392 U CN 2030392U CN 88211404 CN88211404 CN 88211404 CN 88211404 U CN88211404 U CN 88211404U CN 2030392 U CN2030392 U CN 2030392U
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- gto
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Abstract
The utility model discloses a reactive power supply unit using GTO belonging to a reactive power supply unit electric power system, which is used to regulate the reactive current and electric voltage of an electric power system. The utility model utilizes a gate turn-off thyristor (GTO) to replace the ordinary silicon controlled (SCR) and the forced reversing circuit of the main circuit reactive generation bridge of the existing reactive power supply device, which solves the problems of multiple elements, large internal loss and low response of the device. The utility model can meet fully the requirements of the dynamic reactive power compensation caused by special loads such as rolling machines, electric arc furnaces, electric locomotives, large semiconductor inversion devices, etc. and improve the running reliability of the device; besides, the utility model increases the response speed of regulating electric power system reactive power to achieve strong excitation and strong reduction, so the maintenance is convenient.
Description
The utility model relates to a kind ofly to be realized by the semiconductor converting technology.The power system reactive power supply unit is used to take place capacitive character and inductive reactive power, regulates the reactive power flow and the voltage of electric power system.
Owing to exist specific loads such as rolling mill, arc furnace, electric locomotive, large-scale semiconductor converting equipment in the electric power system.The reactive power of the band impact that absorbs during their operations and the harmonic wave of generation and asymmetric electric current inject power network, seriously influence the network voltage quality, can cause the deterioration of the reduction of power supply quality and power system operation reliability, economy.The dynamic passive compensation requirement that can not fully satisfy this specific loads and caused as compensator, capacitor, reactor, therefore, a kind of controllable silicon reactive power source device that adopts the forced reversing circuit has appearred again in the prior art, see the Huabei Electric Power College journal of China, 18～24 pages of 1987 the 3rd phases.Controllable silicon reactive power source device working link mainly is to make DC start capacitor C d charge to required voltage, controlling unit (6) is started working, by rule conducting or shutoff pulse are added on the corresponding controllable silicon (SCR), make the device output AC voltage, regulate the output pulse of controlling unit (6), make device identical with electrical system bus (1) voltage swing and phase place through the alternating voltage size and the phase place of output transformer (3) output, this moment, whole device put into operation, after the operation, the alternating voltage of the electrical system bus (1) that records through measuring circuit (5), the variation of alternating current and the reactive power that reflects, changed controlling unit (6) to burst length that idle generation electric bridge carried, change the phase angle between the alternating voltage of the same electrical system bus of idle generation bridge output voltage (1), thereby changed the character and the size of carrying reactive power to electric power system.But because the idle generation electric bridge of main circuit of controllable silicon reactive power source device has adopted controllable silicon (SCR) element, element itself can only be realized gate pole control conducting and can not turn-off this characteristic limitations, make to have the forced reversing circuit, caused device to want more than the element that body contains and work complicated.
The purpose of this utility model is to adopt a kind of new element to constitute the reactive power source device, replaces common controllable silicon of the prior art (SCR) and forced reversing circuit, reduces contained element spare of device and internal loss.
The way of finishing this purpose is: adopt gate level turn-off thyristor (Gate Turn Off Thyristor, be called for short: the idle generation electric bridge of main circuit (4) that (GTO) constitutes the reactive power source device, idle generation electric bridge (4) and electrical system bus (1) are linked through switch (2) by output transformer (3), measuring circuit (5) records the voltage of electrical system bus (1), current signal is sent into controlling unit (6), the controlling unit (6) that is realized by microprocessor is to the in addition computing of the signal of measuring circuit (5) input, according to the control law output control pulse of operational mode, the GTO conducting of controlling in the idle generation electric bridge (4) is regulated character and the size of exporting reactive power with disconnection.
DC start capacitor C d is charged by outside auxiliary DC power supply, is used for the voltage of idle generation electric bridge (4) when beginning to start and sets up.And postrun filtering.
Idle generation electric bridge (4) is formed three in-phase branch (A, B, C) by the brachium pontis (7) of six same structures and is constituted.
Each brachium pontis (7) all adopts GTO, fly-wheel diode and antihunt circuit symmetric arrangement to be formed by connecting.
GTO is in order to the output reactive power, and its gate pole is connected with controlling unit (6), and controlling unit (6) generation conducting and turn-off pulse can make GTO commutate to regulate the size of output capacitive or inductive reactive power.
Sustained diode is in order to keep the voltage on the DC start capacitor C d by afterflow, on each brachium pontis (7), the negative electrode of fly-wheel diode is connected with the anode of GTO, its anode is connected with the negative electrode of GTO, is the crystal diode with quick recovery characteristics.
Antihunt circuit (8) is the basic circuit that this area engineers and technicians know, be also referred to as buffer circuit, sort circuit is varied in the prior art, can be implanted in the idle generation electric bridge (4), its citation form has two kinds, by the condenser damping circuit that resistance diode, electric capacity constitute, be used for the voltage variability of restriction when switch-off power semiconductor device (as GTO element and high power transistor) turn-offs; The inductance damping resistance that constitutes by resistance, diode, inductance, be used to limit the electric current variability when opening, electric capacity, inductance are energy storage unit, restriction through diode polarity, discharge by resistance, this resistance can replace with a transformer, and it is littler to make the inductance antihunt circuit that is connected in the branch road simultaneously and And be associated in the energy loss of storing in the condenser damping circuit on the GTO element, constitutes efficient antihunt circuit.
The utility model is the output transformer (3) that has been solved by prior art, measuring circuit (5), the controlling unit (6) and other the electric link that are realized by microprocessor have constituted the reactive power source device with the idle generation bridge (4) that adopts GTO to realize, because the conducting of GTO applies positive negative pulse stuffing with shutoff by gate pole and realizes, so GTO has replaced controllable silicon of the prior art (SCR) and forced reversing circuit, contained number of elements of device and internal loss thereof have been reduced, improved the device reliability of operation, simultaneously because the cancellation of forced reversing circuit has also improved the response speed of regulating power system reactive power power, realized encouraging by force and subtracted the Maintenance and Repair work that has made things convenient for the technical staff by force.Adopt the idle generation electric bridge (4) that the GTO element just applied the latter stage seventies constitutes, being applied in the power system reactive power supply unit, is a The New Beginning to reliability and the economy operation that improves electric power system.
Fig. 1, power system reactive power supply unit theory diagram;
Fig. 2, idle generation electrical bridge principle schematic diagram;
Fig. 3, idle generation electric bridge brachium pontis basic circuit diagram;
Fig. 4, idle generation bridge circuit figure.
In conjunction with the accompanying drawings the utility model is described further with embodiment below:
See power system reactive power supply unit shown in Figure 1, general all is to adopt many idle generation electric bridges of group (4) to improve the voltage waveform that superposes by the output transformer phase shift, adopt six groups of idle generation electric bridges (4), the output transformer (3) that just needs seven windings, in order to narrate conveniently, embodiments of the invention are that example is described further with the idle generation electric bridge of single group.Output transformer (3) is that (capacity is 3000 volt-amperes to a cored three-phase two winding transformer, voltage change ratio is 1, with idle generation electric bridge (4) example is primary side, rated primary voltage is 380 volts, winding connection is: triangle---star), switch (2), measuring circuit is (by electric current, voltage transformer and control survey connect electrical system bus (1) and controlling unit (6) with instrument), controlling unit (6) (is realized by microprocessor, have electric links such as pulse amplifying circuit), all be to solve in the prior art, the technology that this area engineers and technicians know.
See Fig. 2, single group idle generation electric bridge (4) shown in Figure 3, be that the most basic form is formed three in-phase branch (A by the brachium pontis (7) of six same structures, B, C), each brachium pontis (7) all is to adopt GTO (model: GFT20B12, forward is withstand voltage 1200 volts, but cut-off current 65 peaces, rated current 7 peaces), fly-wheel diode (model: KP 10,1200 volts of reverse voltages) crystal diode for having quick recovery characteristics, antihunt circuit has only adopted and has not had booster diode, the simplest condenser damping circuit, capacitor C is 0.47 microfarad, and resistance R is 30 ohm.DC start capacitor C d is 40 microfarads, 630 volts of rated voltages.It is symmetric arrangement that each element in the whole idle generation electric bridge (4) connects.
See idle generation electric bridge (4) shown in Figure 4; be with Fig. 2; idle generation electric bridge shown in Figure 3 is a basic circuit; the various parameters of element are identical; just hybrid, symmetrical ground uses condenser damping circuit and inductance antihunt circuit; change of current inductance L e (5 microhenrys of on in-phase branch, connecting; to have tapped shunted resistively inductance Lk (200 microhenry) all be the simplest form of inductance antihunt circuit with being connected between two brachium pontis in in-phase branch; the air core inductor that change of current inductance L e and shunted resistively inductance Lk all adopt the copper cash coiling to form; purpose is in order to reduce device internal loss (core loss), and these two kinds of antihunt circuits can make the major component GTO of idle generation bridge (4) (produce voltage when turning on and off; during the electric current variability) protected.
Claims (8)
1, a kind ofly realizes the power system reactive power supply unit by the semiconductor converting technology.Include output transformer (3), measuring circuit (5), controlling unit (6), idle generation electric bridge (4), of the present utility modelly be characterised in that it is that major component constitutes that the idle generation electric bridge of main circuit (4) that is connected between output transformer (3) and the controlling unit (6) adopts GTO.
2, device according to claim 1 is characterized in that idle generation electric bridge (4) forms three in-phase branch (A, B, C) by six identical brachium pontis (7) and constitute.
3, device according to claim 2 is characterized in that each brachium pontis (7) all adopts GTO, sustained diode, antihunt circuit (8) formation that is connected in parallel.
4, device according to claim 3, it is characterized in that can be with the crystal diode with quick recovery characteristics with the sustained diode of GTO parallel connection.
5, device according to claim 3 is characterized in that the condenser damping circuit (8) that is connected in parallel with GTO, can adopt electric capacity (C) to connect with resistance (R) and booster diode connects and composes.
6, device according to claim 3, it is characterized in that being connected in the in-phase branch (A, B, C), and the inductance antihunt circuit that connects between two brachium pontis (7) in the in-phase branch (A, B, C), can adopt inductance and booster diode in parallel to connect and compose with resistance.
7, device according to claim 6 is characterized in that the air-core inductance that the inductance in the antihunt circuit can adopt the copper cash coiling to form.
8,, it is characterized in that the resistance in the antihunt circuit can replace with transformer according to claim 5,6,7 described devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88211404 CN2030392U (en) | 1988-01-31 | 1988-01-31 | Reactive power supply unit using GTO |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88211404 CN2030392U (en) | 1988-01-31 | 1988-01-31 | Reactive power supply unit using GTO |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2030392U true CN2030392U (en) | 1989-01-04 |
Family
ID=4844808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88211404 Withdrawn CN2030392U (en) | 1988-01-31 | 1988-01-31 | Reactive power supply unit using GTO |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2030392U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1042079C (en) * | 1995-05-29 | 1999-02-10 | 三菱电机株式会社 | Power system compensator apparatus and power converter apparatus |
-
1988
- 1988-01-31 CN CN 88211404 patent/CN2030392U/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1042079C (en) * | 1995-05-29 | 1999-02-10 | 三菱电机株式会社 | Power system compensator apparatus and power converter apparatus |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |