CN204103445U - A kind of HVDC protection device and converter - Google Patents
A kind of HVDC protection device and converter Download PDFInfo
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- CN204103445U CN204103445U CN201420086273.8U CN201420086273U CN204103445U CN 204103445 U CN204103445 U CN 204103445U CN 201420086273 U CN201420086273 U CN 201420086273U CN 204103445 U CN204103445 U CN 204103445U
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- 230000001681 protective effect Effects 0.000 claims abstract description 67
- 208000035126 Facies Diseases 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims description 4
- 238000013016 damping Methods 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 26
- 238000005516 engineering process Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The utility model discloses a kind of HVDC protection device, and comprise resistance unit and the current switch cell that two-way circulates, this protective device is formed in parallel by described resistance unit and the described current switch cell that two-way circulates; Wherein said resistance unit is formed by least one resistance cascade, described in the current switch cell that two-way circulates formed by least one current switch cascade of two-way circulating.A kind of converter containing this protective device is also provided in addition, in each facies unit, protective device described at least one of connecting.The utility model can fast, effectively suppress direct-current short circuit electric current, damping current to vibrate; both can better proterctive equipment safety; can greatly shorten fault current die-away time again thus shorten direct current idle time; further, at utmost the stop transport economic loss brought and system unstability risk is reduced.And this apparatus structure is simple, cost is lower, has good realizability and economy.
Description
Technical field
The invention belongs to direct current transportation field, particularly a kind of protective device of flexible DC power transmission direct-current short circuit fault and the converter that uses this protective device to form.
Background technology
HVDC Transmission Technology (HVDC, High-Voltage Direct Current) be a kind of by means of high-power half control power electronic device (as thyristor) or entirely control power electronic device (as insulated gate bipolar transistor (IGBT, Insulated Gate Bipolar Transistor), integrated gate commutated thyristor (IGCT, Intergrated Gate Commutated Thyristors) etc.) realize ac/dc and AC/DC conversion, thus the transmission technology of the energy that transmits electric power with DC form.Wherein, the direct current transportation of use half control type power electronic device thyristor is called the DC transmission system (CSC-HVDC) based on current source type converter, transmits electricity also referred to as customary DC; The direct current transportation of use full-control type electric and electronic device IGBT is called the DC transmission system (VSC-HVDC) based on voltage source converter, also referred to as flexible DC power transmission.
DC transmission system belongs to high pressure, high-current electrical equipment, once break down, just likely makes equipment because of overvoltage or over-current shock and loss.Therefore, suitable safeguard measure is the indispensable important component part of DC transmission system safety, reliability service.
In various possible fault, be especially that the DC side fault of representative is general with DC line fault.Because direct current transmission circuit may reach thousands of miles, and be exposed in complicated natural environment, the maximum probability broken down.When faults such as DC line are short-circuited, DC transmission system, by there is serious overcurrent, needs to suppress short circuit current in time, and assists direct current system from fault, to recover normal operation as early as possible.
The three-phase bridge converter that customary DC uses thyristor device to form, when there is dc-side short-circuit fault, can by suppressing direct-current short circuit electric current to the quick control at IGBT group angle, specific practice is: when there is direct-current short circuit fault, the phase shift of quick control Trigger Angle makes direct voltage reverse rapidly, thus suppresses direct-current short circuit electric current rapidly, after the current interruption of short dot nature, recover Trigger Angle normally to control, and recover DC transmission system and normally run.If disposable transient fault, maintenance normally runs by DC transmission system; If permanent short trouble, again will occur short circuit current after System recover, direct-current power transmission control protection system disconnects according to the relay protective scheme pre-established and exchanges service entrance switch, thus whole DC transmission system is stopped transport.Fortunately, this permanent fault only accounts for very little ratio in DC line fault, and therefore customary DC transmission system is seldom stopped transport completely because of DC line short circuit.
But this fine protected mode is used in flexible DC power transmission completely infeasible.Because flexible direct current power transmission system adopts IGBT to form voltage source converter, direct voltage cannot be made reverse by converter control, also therefore cannot suppress short circuit current in like fashion.So the measure of flexible direct current power transmission system reply DC line short trouble is: directly disconnect and exchange service entrance switch, thus whole DC transmission system stopped transport.After pending fault current attenuation, more again charge, run.
In Practical Project, be also not enough to well protect the equipment of flexible direct current power transmission system not by security threat even if the cost paying system shutdown deals with dc-side short-circuit fault:
(1) diode component is parallel with in flexible direct-current transmission converter, when there is direct-current short circuit fault, for direct-current short circuit electric current provides loop, even if exchange service entrance switch to open, cutout electric current in DC loop also can be decayed due to the existence of diode difficulty, on the one hand equipment by the longer time be exposed to heavy current impact under, also substantially prolongs the time that whole system is recovered on the other hand, thus aggravation economic loss and system unstability risk.
(2) when short circuit occurs, the equipment such as the inductance of flexible direct current power transmission system and electric capacity will make short circuit current vibrate, and exacerbate its destructive power to equipment and external system further.
The most direct solution of one is in DC loop, increase DC circuit breaker, when short trouble occurs, disconnects rapidly direct-current short circuit electric current by DC circuit breaker.But the technology maturity due to this equipment is also not enough to realize engineer applied, therefore also cannot adopt within very long a period of time.In future, even if after application technology maturation, its equipment is complicated, cost is high, and operation maintenance workload is large, less economical.
Summary of the invention
The object of the present invention is to provide a kind of HVDC protection device and converter, effective solve flexible direct current power transmission system short circuit current decay difficulty, exist vibration inherent shortcoming, and realize simple, good economy performance.
In order to achieve the above object, the invention provides a kind of HVDC protection device, its feature exists, and comprise resistance unit and the current switch cell that two-way circulates, this protective device is formed in parallel by described resistance unit and the described current switch cell that two-way circulates; Wherein said resistance unit is made up of a resistance, or is formed by multiple resistance cascade, described in the current switch cell that two-way circulates be made up of the current switch that two-way circulates, or to be formed by many one current switch cascade of two-way circulating.
Further, described current switch being formed in parallel by diode and switching tube unit of two-way circulating, wherein, one end of the positive pole of described switching tube unit, the negative pole of described diode and described resistance unit links together, and is defined as the anode of described protective device;
The other end of the negative pole of described switching tube unit, the positive pole of described diode and described resistance unit links together, and is defined as the negative terminal of described protective device;
Described diode is made up of a diode, or is formed by multiple diode cascade, and described switching tube unit is made up of a switching tube, or is formed by multiple switching tube cascade.
Further, described switching tube is that have can the power semiconductor of turn-off function.
Further, the current switch that two-way circulates described in adopts IGBT, the positive pole using the collector electrode of described IGBT as the described current switch that two-way circulates, the negative pole using the emitter of described IGBT as the described current switch that two-way circulates;
Or, the described current switch that two-way circulates adopts at least one IGCT or at least one GTO to form, positive pole using the anode of described IGCT or described GTO as the described current switch that two-way circulates, the negative pole using the negative electrode of described IGCT or GTO as the described current switch that two-way circulates;
Or, described in the current switch that two-way circulates adopt at least one MOSFET to form, using the drain electrode of described MOSFET as described in two-way circulate the positive pole of current switch, the negative pole using the source electrode of described MOSFET as the described current switch that two-way circulates.
Further, described protective device also configures corresponding cooling device.
Further, shunt voltage protection component between the both positive and negative polarity being also included in described protective device.
Further, by-pass switch element in parallel between the both positive and negative polarity being also included in described protective device.
Further, described resistance R span is at 0.1 ~ 100 ohm.
The present invention also provides a kind of converter containing this protective device, and described converter comprises three-phase, and each comprises upper and lower two brachium pontis mutually, and described each brachium pontis is in series by a reactor unit and at least one submodule; Two brachium pontis up and down of each phase are combined and become a facies unit, and the tie point of upper and lower bridge arm is mid point, and the exit of three upper brachium pontis links together, and is described converter anode; The exit of three lower brachium pontis links together, and is the negative terminal of described converter, it is characterized in that, in each facies unit, and protective device described at least one of connecting.
Further; protective device described at least one of connecting specifically refers to: protective device described at least one is connected between described reactor and described submodule; or be connected between described reactor and described mid point; or be connected between two described submodules; or be connected between described submodule and described converter anode, or be connected between described submodule and described converter negative terminal.
Further, the quantity of the protective device of connecting in each facies unit is equal.
Further, it is characterized in that, described converter is applicable to voltage-source type topology, can be modular multi-level flexible direct current system, two level flexible direct current system or three level flexible direct current system.
The invention has the beneficial effects as follows: for flexible DC power transmission provides a kind of protective device and converter; can direct-current short circuit electric current, damping current fast, be effectively suppressed to vibrate; both can better proterctive equipment safety; can greatly shorten fault current die-away time again thus shorten direct current idle time; further, at utmost the stop transport economic loss brought and system unstability risk is reduced.And this apparatus structure is simple, cost is lower, has good realizability and economy.
Accompanying drawing explanation
Fig. 1 is a kind of modular multi-level flexible direct-current transmission topology;
Fig. 2 is the cellular construction figure of a kind of protective device of the embodiment of the present invention;
Fig. 3 is a kind of converter structure schematic diagram containing protective device of the embodiment of the present invention.
Embodiment
Below with reference to accompanying drawing, technical scheme of the present invention is described in detail.
As shown in Figure 1, be the topological structure of a converter.This converter comprises three-phase, and each comprises upper and lower two brachium pontis mutually, is made up of altogether 6 brachium pontis.Each brachium pontis is in series by a reactor L and N number of submodule SM, and two brachium pontis up and down of each phase are combined and become a facies unit.The tie point of upper and lower bridge arm is called mid point.The exit of three upper brachium pontis links together, and is converter anode; The exit of three lower brachium pontis links together, and is the negative terminal of converter.
The invention provides a kind of protective device, comprise a resistance unit and the current switch cell that two-way circulates, this protective device is formed in parallel by described resistance unit and the described current switch cell that two-way circulates.Wherein said resistance unit can be a resistance, or multiple resistance is formed by mode cascades such as series connection or parallel connections, same, this current switch cell that two-way circulates also can be a bidirectional switch, or is formed by multiple current switch cascade of two-way circulating.
Further, this current switch that two-way circulates can being formed in parallel by diode and switching tube unit, wherein, one end of the positive pole of described switching tube unit, the negative pole of described diode and described resistance unit links together, and is defined as the anode of described protective device; The other end of the negative pole of switching tube unit, the positive pole of described diode and described resistance unit links together, and is defined as the negative terminal of described protective device; Described diode can be a diode, or is formed by multiple diode cascade, and described switching tube unit can be a switching tube, or is formed by multiple switching tube cascade.Switching tube is that have can the power semiconductor of turn-off function.
The current switch that two-way circulates can also adopt IGBT, the positive pole using the collector electrode of described IGBT as the described current switch that two-way circulates, the negative pole using the emitter of described IGBT as the described current switch that two-way circulates.
Or, the described current switch that two-way circulates adopts at least one IGCT or at least one gate leve cutoff thyristor (Gate-Turn-Off Thyristor, GTO) add that other servicing units are formed, positive pole using the anode of described IGCT or described GTO as the described current switch that two-way circulates, the negative pole using the negative electrode of described IGCT or GTO as the described current switch that two-way circulates.
Or, the current switch that two-way circulates described in the current switch that two-way circulates can also adopt adopts metal-oxide half field effect transistor ((Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET) add that other servicing units are formed, using the drain electrode of described MOSFET as described in two-way circulate the positive pole of current switch, the negative pole using the source electrode of described MOSFET as the described current switch that two-way circulates.
In addition, the switching tube of protective device will flow through bridge arm current, and therefore this protective device can also configure corresponding cooling device.Preferably, water-cooling can be adopted.
In addition, all right shunt voltage protection component between the both positive and negative polarity of described protective device, to suppress the overvoltage of switch ends.
In addition, all right by-pass switch element in parallel between the both positive and negative polarity of described protective device, to excise protective device easily.
In addition, the resistance R span in protective device is at 0.1 ~ 100 ohm.
Be a preferred embodiment of protective device as shown in Figure 2, comprise a resistance, a switching tube and a diode.One end of the positive pole of switch transistor T, the negative pole of diode and resistance links together, and is defined as the anode of this protective device, and the negative pole of the T of switching tube, the positive pole of diode and the resistance other end link together, and are defined as the negative terminal of this protective device.
It should be noted that a resistance unit here can be a resistance, also can be multiple resistance be consisted of cascade systems such as series, parallel, and is not limited to an actual resistance.Same, switching tube, diode all can be formed by multiple cascade.Here Fig. 2 is an equivalent circuit diagram of protective device embodiment.
The present invention also provides a kind of converter of this protective device, and this converter comprises three-phase, and each comprises upper and lower two brachium pontis mutually, and described each brachium pontis is in series by a reactor unit and at least one submodule; Two brachium pontis up and down of each phase are combined and become a facies unit, and the tie point of upper and lower bridge arm is mid point, and the exit of three upper brachium pontis links together, and is described converter anode; The exit of three lower brachium pontis links together, and is the negative terminal of described converter, it is characterized in that, in each facies unit, and protective device described at least one of connecting.
Reactor unit mentioned here can be that a reactor or multiple reactor cascade form.
Preferably, the quantity of the protective device of connecting in each facies unit is equal.
Protective device can be connected on the optional position in facies unit; such as can be connected between described reactor and described submodule; or be connected between described reactor and described mid point; or be connected between two described submodules; or be connected between described submodule and described converter anode, or be connected between described submodule and described converter negative terminal.
Described protective device can be connected on the symmetric position in upper and lower bridge arm simultaneously, also can be asymmetric.
The protective device of connecting in each facies unit can be gone here and there at correspondence position, also can not be corresponding.
Here converter can be modular multi-level flexible direct current system, two level flexible direct current system or three level flexible direct current system.
One preferably embodiment as shown in Figure 3, is be connected on by protective device in the converter given by Fig. 1, the submodule of brachium pontis and a protective device of respectively connecting between reactor on three.
In this converter provided by the invention, the series system of protective device, belongs to the series connection of the AC at converter.Such tool beneficial effect is: (1) protective device can good with converter integrated design, engineering realizability, save space.Protective device can adopt modular design concept; direct and converter submodule adopts standardized designs and assembling; consistent with submodule profile, size, wiring; directly be installed in converter; do not occupy exceptional space, this advantage is most important in the flexible DC power transmission engineering emphasizing very much compact design.(2) without the need to independently getting energy.Switching tube in protective device and control loop thereof need suitable Power supply, install at AC, can share get energy loop with converter valve.(3) independent cooling device can be configured, share cooling device with other equipment.Device for high-power power electronic in protective device needs Water-cooling circulating to lower the temperature, and installs, can share water cooling equipment with converter valve at converter valve AC.(4) structure is simple, volume is little, cost is low.Compare DC side, ac-side current effective value is little, and the switching tube of protective device can select converter same model switching tube, and without the need to adopting Multi-Switch pipe parallel-connection structure to carry out motor current rated value.(5) current oscillation better effects if is suppressed.Theory analysis and result of the test show, it is good to the inhibition of current oscillation at the fault initial stage that protective device is connected on converter AC, effectively can suppress the fault current peak value of brachium pontis, reduce the submodule current stress of whole brachium pontis.
Cascade alleged in the present invention, comprises the connected modes such as series, parallel.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (12)
1. a HVDC protection device, is characterized in that, comprise resistance unit and the current switch cell that two-way circulates, this protective device is formed in parallel by described resistance unit and the described current switch cell that two-way circulates; Wherein said resistance unit is made up of a resistance, or is formed by multiple resistance cascade, described in the current switch cell that two-way circulates be made up of the current switch that two-way circulates, or to be formed by multiple current switch cascade of two-way circulating; Described current switch being formed in parallel by diode and switching tube unit of two-way circulating, wherein, one end of the positive pole of described switching tube unit, the negative pole of described diode and described resistance unit links together, and is defined as the anode of described protective device; The other end of the negative pole of described switching tube unit, the positive pole of described diode and described resistance unit links together, and is defined as the negative terminal of described protective device.
2. protective device as claimed in claim 1, it is characterized in that, described diode is made up of a diode, or is formed by multiple diode cascade, and described switching tube unit is made up of a switching tube, or is formed by multiple switching tube cascade.
3. protective device as claimed in claim 2, is characterized in that, described switching tube is that have can the power semiconductor of turn-off function.
4. protective device as claimed in claim 1, it is characterized in that, the described current switch that two-way circulates adopts IGBT, the positive pole using the collector electrode of described IGBT as the described current switch that two-way circulates, the negative pole using the emitter of described IGBT as the described current switch that two-way circulates;
Or, the described current switch that two-way circulates adopts at least one IGCT or at least one GTO to form, positive pole using the anode of described IGCT or described GTO as the described current switch that two-way circulates, the negative pole using the negative electrode of described IGCT or GTO as the described current switch that two-way circulates;
Or, described in the current switch that two-way circulates adopt at least one MOSFET to form, using the drain electrode of described MOSFET as described in two-way circulate the positive pole of current switch, the negative pole using the source electrode of described MOSFET as the described current switch that two-way circulates.
5. protective device as claimed in claim 1, it is characterized in that, described protective device also configures corresponding cooling device.
6. protective device as claimed in claim 1, is characterized in that, shunt voltage protection component between the both positive and negative polarity being also included in described protective device.
7. protective device as claimed in claim 1, is characterized in that, by-pass switch element in parallel between the both positive and negative polarity being also included in described protective device.
8. protective device as claimed in claim 1, it is characterized in that, described resistance value scope is at 0.1 ~ 100 ohm.
9. the converter containing protective device described in claim 1, it is characterized in that, described converter comprises three-phase, and each comprises upper and lower two brachium pontis mutually, and described each brachium pontis is in series by a reactor unit and at least one submodule; Two brachium pontis up and down of each phase are combined and become a facies unit, and the tie point of upper and lower bridge arm is mid point, and the exit of three upper brachium pontis links together, and is described converter anode; The exit of three lower brachium pontis links together, and is the negative terminal of described converter; In each facies unit, protective device described at least one of connecting; Wherein said reactor unit is made up of a reactor or is formed by multiple reactor cascade.
10. converter as claimed in claim 9; it is characterized in that; protective device described at least one of connecting specifically refers to: protective device described at least one is connected between described reactor and described submodule; or be connected between described reactor and described mid point; or be connected between two described submodules; or be connected between described submodule and described converter anode, or be connected between described submodule and described converter negative terminal.
11. converters as described in claim 9 or 10, it is characterized in that, the quantity of the protective device of connecting in each facies unit is equal.
12. converters as claimed in claim 9, it is characterized in that, described converter is applicable to voltage-source type topology, can be modular multi-level flexible direct current system, two level flexible direct current system or three level flexible direct current system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420086273.8U CN204103445U (en) | 2014-02-27 | 2014-02-27 | A kind of HVDC protection device and converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420086273.8U CN204103445U (en) | 2014-02-27 | 2014-02-27 | A kind of HVDC protection device and converter |
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| CN204103445U true CN204103445U (en) | 2015-01-14 |
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| CN201420086273.8U Expired - Lifetime CN204103445U (en) | 2014-02-27 | 2014-02-27 | A kind of HVDC protection device and converter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009446A (en) * | 2014-02-27 | 2014-08-27 | 南京南瑞继保电气有限公司 | Direct-current transmission protection device, current converter and protection method |
| CN108649539A (en) * | 2018-04-23 | 2018-10-12 | 天津大学 | AC/DC interconnected system failure sorted cutting method based on VSC |
| CN112825451A (en) * | 2019-11-18 | 2021-05-21 | 南京南瑞继保电气有限公司 | Energy balance adjustment converter chain, control method, multi-section converter chain and converter |
-
2014
- 2014-02-27 CN CN201420086273.8U patent/CN204103445U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009446A (en) * | 2014-02-27 | 2014-08-27 | 南京南瑞继保电气有限公司 | Direct-current transmission protection device, current converter and protection method |
| CN108649539A (en) * | 2018-04-23 | 2018-10-12 | 天津大学 | AC/DC interconnected system failure sorted cutting method based on VSC |
| CN108649539B (en) * | 2018-04-23 | 2019-07-30 | 天津大学 | AC/DC interconnected system failure sorted cutting method based on VSC |
| CN112825451A (en) * | 2019-11-18 | 2021-05-21 | 南京南瑞继保电气有限公司 | Energy balance adjustment converter chain, control method, multi-section converter chain and converter |
| CN112825451B (en) * | 2019-11-18 | 2022-04-19 | 南京南瑞继保电气有限公司 | Energy balance adjustment converter chain, control method, multi-section converter chain and converter |
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