CN104600758B - A kind of the self-energizing device and its implementation of high voltage DC breaker - Google Patents

A kind of the self-energizing device and its implementation of high voltage DC breaker Download PDF

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Publication number
CN104600758B
CN104600758B CN201410849622.1A CN201410849622A CN104600758B CN 104600758 B CN104600758 B CN 104600758B CN 201410849622 A CN201410849622 A CN 201410849622A CN 104600758 B CN104600758 B CN 104600758B
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self
breaker
energizing device
main branch
voltage
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CN104600758A (en
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杨兵建
高冲
高阳
魏晓光
张升
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State Grid Corp of China SGCC
Global Energy Interconnection Research Institute
North China Grid Co Ltd
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State Grid Corp of China SGCC
Global Energy Interconnection Research Institute
North China Grid Co Ltd
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Abstract

The invention discloses the self-energizing devices and its implementation of a kind of high voltage DC breaker, the self-energizing device is made of sequentially connected route taking energy unit, high-frequency inverter circuit, high frequency transformer, magnetic ring transformer and regulator rectifier circuit, the implementation method of the self-energizing device obtains energy from the electric current of the main branch the following steps are included: the route taking energy unit is serially connected in the main branch of the high voltage DC breaker;When flowing through electric current in main branch, the turn-on and turn-off of the switching tube are controlled;The charging time of the capacitor is adjusted to control the voltage range of the capacitor.Technical solution provided by the invention utilizes the energy in route, other individual power supply is not needed, dc circuit breaker suitable for mechanical switch and power electronic devices mixed type, when for by multiple dc circuit breakers current-limiting apparatus in series, relative to the scheme powered from low potential by high frequency transformer, the insulating requirements of high frequency transformer are reduced.

Description

A kind of the self-energizing device and its implementation of high voltage DC breaker
Technical field
The present invention relates to a kind of power electronic equipments, and in particular to a kind of self-energizing device of high voltage DC breaker and its Implementation method.
Background technique
High voltage DC breaker is mainly used in direct current transmission and distribution route, disjunction DC line electric current.To reduce on-state damage Consumption, while shortening the breaker actuation time, using mechanical switch and the dc circuit breaker of power electronic devices hybrid mode by More and more concerns, and derive a variety of topologys.When the dc circuit breaker of the type operates normally, electric current, which flows through machinery, to be opened It closes, when over current fault occurring in route, electric current is transferred in the power electronic devices branch being connected in parallel, then by power electronics Device breaking current.
Belong to this kind of breaker if the breaker introduced in the patent application No. is 20130051175.9, such direct current The mechanical switch branch that electric current is flowed through when operating normally in breaker is known as main branch, the power electronic devices for breaking current Branch is known as shifting branch.Since the voltage of DC line is up to tens to several hundred kilovolts, and the pressure-resistant phase of power electronic devices To smaller, therefore power electronic devices is connected when being applied in DC line, including direct devices in series is (specially Sharp 200980162538.X) or by block coupled in series (patent 20130051175.9), concatenated number be up to tens even on Hundred.A large amount of IGBT units or the needs of module power and meet insulating requirements.The DC series applied in direct current transportation IGBT energy (EP0868014B1), modular multilevel (Modular can be obtained from IGBT side pressure in an off state Multilevel Converter, MMC) submodule in converter valve can also obtain energy from selfcapacity, because of its submodule Block capacitor keeps certain voltage under normal operating conditions.
However direct concatenated IGBT unit or cascade submodule in dc circuit breaker, it is operated normally in breaker In, it is chronically on state, also without voltage in the capacitor of submodule, therefore directly cannot obtain energy from submodule itself Amount.For this application of dc circuit breaker, WO2011/095212 A2 patent document discloses a kind of sharp light delivery Solve the technical solution of high-voltage isulation.However swash light delivery higher cost, especially in IGBT unit or cascade submodule Function it is more when, the energy for needing to energize is bigger, and undoubtedly this considerably increases the costs of equipment.
It is that energy is sent using the pulse transformer of high-voltage isulation that another, which takes energy method, since each pulse transformer will The high-voltage isulation for being greater than DC bus-bar voltage is born, so cost is also high.
Accordingly, it is desirable to provide a kind of energy taking device and its method, energy can be obtained from dc circuit breaker main branch And then a large amount of sub-series module for power supply into transfer branch.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of self-energizing device of high voltage DC breaker, described to ask for Energy device is by sequentially connected route taking energy unit, high-frequency inverter circuit, high frequency transformer, magnetic ring transformer and rectifying and voltage-stabilizing electricity Road is constituted.
Preferably, the route taking energy unit is constituted by two bridge arms are in parallel with a capacitor, and the bridge arm is by one two Pole pipe and a switching tube with anti-paralleled diode are in series, the tie point access of the diode and the switching tube In the main branch of high voltage DC breaker, the capacitor both ends are connected to the high-frequency inverter circuit.
Preferably, the high-frequency inverter circuit is input, output high-frequency current to institute with the capacitance terminal of route taking energy unit State high frequency transformer.
Preferably, the primary and secondary side of the high frequency transformer is respectively a winding and more than one winding.
Preferably, the primary side of the high frequency transformer connects high-frequency inverter circuit, and secondary side output is connected to magnetic by high-tension cable Ring transformer.
Preferably, the self-energizing device includes the full-bridge submodule connecting with the regulator rectifier circuit.
A kind of implementation method of the self-energizing device of high voltage DC breaker, the self-energizing device are above-mentioned high straightening Flow the self-energizing device of breaker, the implementation method of the self-energizing device the following steps are included:
The route taking energy unit is serially connected in the main branch of the high voltage DC breaker by S1, from the main branch Electric current in obtain energy;
S2 controls the turn-on and turn-off of the switching tube when flowing through electric current in main branch;
S3 adjusts the charging time of the capacitor to control the voltage range of the capacitor.
Preferably, the voltage of the capacitor is less than the conduction voltage drop of the switching tube.
Compared with the nearest prior art, the invention has the benefit that
1, energy taking device proposed by the present invention can obtain energy from main branch line current, to shift branch submodule Or the driving power supply of IGBT unit, do not need other individual power supply.
2, route taking energy unit and high-frequency inverter use low tension switch device in energy taking device proposed by the present invention, are used for The capacitor of energy storage also selects low-voltage capacitance, therefore cost is relatively low.
3, energy taking device proposed by the present invention is when for by multiple dc circuit breakers current-limiting apparatus in series, high frequency Transformer insulated voltage is designed according to the resistance to pressure request of single dc circuit breaker where it, is become relative to from ground potential by high frequency The scheme of transformer power-supply reduces the insulating requirements of high frequency transformer.
Detailed description of the invention
Invention is further described in detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the composition schematic diagram of the self-energizing device of high voltage DC breaker of the present invention;
Fig. 2 is the main circuit diagram of route taking energy unit in Fig. 1;
Fig. 3 is the main circuit diagram when self-energizing device of high voltage DC breaker of the present invention is applied in dc circuit breaker;
Fig. 4 is the main circuit diagram of full-bridge submodule in Fig. 1;
Fig. 5 is the wiring diagram that the present invention is applied to the direct current current-limiting device being made of full-bridge submodule;
Appended drawing reference: 5- route taking energy unit;6- high frequency transformer;7- full-bridge submodule;8- magnetic ring transformer;14- high Frequency inverter circuit;15- regulator rectifier circuit.
Specific embodiment
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
In order to thoroughly understand the embodiment of the present invention, detailed structure will be proposed in following description.Obviously, the present invention is real The execution for applying example is not limited to the specific details that those skilled in the art is familiar with.Presently preferred embodiments of the present invention is retouched in detail State it is as follows, however in addition to these detailed description other than, the present invention can also have other embodiments.
- Fig. 4 referring to Fig.1, Fig. 1 are the composition schematic diagram of the self-energizing device of high voltage DC breaker of the present invention;Fig. 2 is figure The main circuit diagram of route taking energy unit in 1;Fig. 3 is the self-energizing device of high voltage DC breaker of the present invention in dc circuit breaker Using when main circuit diagram;Fig. 4 is the main circuit diagram of full-bridge submodule in Fig. 1.Self-energizing device described in Fig. 1 is by being sequentially connected Route taking energy unit 5, high-frequency inverter circuit 14, high frequency transformer 6, magnetic ring transformer 8, regulator rectifier circuit 15 and full-bridge Module 7. is constituted.
As shown in Fig. 2, the electric current of positive and negative both direction shown in 12,13 can be flowed through, route taking energy unit 5 is by two in figure Bridge arm is in parallel with a capacitor C1 to be constituted, and a bridge arm is in series by T1, D1 and D3, another is by T2, D2 and D4 series connection structure At.D1, D2 are respectively the anti-paralleled diode of T1, T2, the tie point access high voltage direct current open circuit of D1, D2, D3, D4 and T1, T2 In the main branch of device, the both ends capacitor C1 are connected to high-frequency inverter circuit 14;The high-frequency inverter circuit 14 is with route taking energy unit 5 The end capacitor C1 be input, output high-frequency current is to the high frequency transformer 6;High frequency transformer 6 has high-voltage isulation effect, high The primary side of frequency power transformer 6 is a winding, and secondary side is multiple windings, and primary side connects high-frequency inverter circuit 14, and secondary side output passes through height Voltage cable passes through multiple magnetic ring transformers 8, the secondary side of each magnetic ring transformer 8 and the submodule or IGBT of transfer branch Regulator rectifier circuit in unit is connected, and powers for the submodule or IGBT unit.
A kind of implementation method of the self-energizing device of high voltage DC breaker, the self-energizing device are above-mentioned high voltage direct current The self-energizing device of breaker, as shown in figure 3, wherein 7 be full-bridge submodule, 5 be self-energizing device proposed by the present invention line Road taking energy unit.Route taking energy unit 5 connects in the main branch;The implementation method of the self-energizing device the following steps are included:
The route taking energy unit 5 is serially connected in the main branch of the high voltage DC breaker by S1, from the main branch Electric current in obtain energy;
S2 controls T1, the turn-on and turn-off of T2 when flowing through electric current in main branch;
S3 adjusts the charging time of capacitor C1, to control the voltage of C1 in a certain range.
If main branch flows through the electric current in direction shown in 12 in Fig. 2, working as T1, when T2 is latched, main branch electric current flows through D1, C1, D4, capacitor C1 charging;Work as T1, when T2 is connected, main branch electric current flows through D1, T2, and capacitor C1 is bypassed.If main branch stream The electric current for crossing direction shown in 13 in Fig. 2 works as T1, and when T2 is latched, main branch electric current flows through D2, C1, D3, capacitor C1 charging;Work as T1, When T2 is connected, main branch electric current flows through D1, T2, and capacitor C1 is bypassed.C1 conveys energy to high-frequency inverter circuit.Sampling capacitance C1 Both end voltage, feeds back to hysteresis comparator, and output can control C1 voltage certain for controlling T1, the conducting and locking of T2 In range.The range is set according to the normal working voltage range of high-frequency inverter circuit.Due to when route taking energy unit locking when, C1 is sealed in main branch, if C1 overtension, main branch can be caused to the transfer branch change of current.To prevent route taking energy unit pair The working condition of dc circuit breaker has an impact, and the voltage of C1 should be less than the conducting pressure of transfer branch submodule or IGBT unit Drop.Therefore, the normal working voltage range of high-frequency inverter circuit is at tens volts or so.
Since route taking energy unit obtains energy from main branch electric current, it is therefore desirable to which electric current is big in breaker main branch In a threshold value, when main branch electric current is greater than the current limit, this takes energy equipment that can normally supply for transfer branch submodule Electricity;When main branch electric current is less than the current limit, this takes can equipment cisco unity malfunction.Main branch Neutron module or IGBT Unit need to be energized using other way, such as light delivery, or send energy from ground potential by high frequency transformer.Due to main branch submodule Or IGBT unit number is less, therefore will not be to very big to cost impact.
Since route taking energy unit and high-frequency inverter circuit operating voltage are at tens volts or so, such high-frequency inverter circuit and The device of lower voltage can be used in switching tube in route taking energy unit, it might even be possible to lower using On-resistance under low current MOSFET as power switch tube.Capacitor can volume also can be smaller.Since the voltage of capacitor C1 is lower, the energy of storage It is less, cause the switching tube switching frequency of route taking energy unit higher, but for low-voltage device, meets switching frequency It is required that not difficult.
When C1 selects biggish capacitance, since the energy of storage is larger, the switching tube of route taking energy unit can be reduced Switching frequency.The super capacitor group that capacitance is several farads such as can be used, can effectively reduce switching frequency.
When the energy taking device is applied to the direct current current-limiting device being made of full-bridge submodule, as shown in figure 5, Fig. 5 is this Invention is applied to the wiring diagram for the direct current current-limiting device being made of full-bridge submodule.Main branch in each breaker is respectively provided with line Road taking energy unit is powered for the transfer branch submodule of the breaker, at this point, high frequency transformer only needs to meet open circuit where it The resistance to pressure request of the insulation of device is higher than the highest residual voltage of arrester.The energy taking device be equally applicable to by half-bridge module or In IGBT unit dc circuit breaker in series.
Self-energizing device proposed by the invention is connected in dc circuit breaker main branch, and the electric current in main branch is stored Into storage capacitor, another mistake becomes high-frequency current, and the son of dc circuit breaker is transported to by high frequency transformer and pulse transformer Module or IGBT unit, for its driving and the power supply of additional control circuit.The self-energizing device is using the energy in route, no Other individual power supply is needed, suitable for the dc circuit breaker of mechanical switch and power electronic devices mixed type, for by more When a dc circuit breaker current-limiting apparatus in series, high frequency transformer insulation voltage is according to the single dc circuit breaker where it Resistance to pressure request design drops the insulating requirements of high frequency transformer relative to the scheme powered from ground potential by high frequency transformer It is low.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent Invention is explained in detail referring to above-described embodiment for pipe, and those of ordinary skill in the art still can be to this hair Bright specific embodiment is modified or replaced equivalently, these without departing from spirit and scope of the invention any modification or Equivalent replacement is being applied within pending claims.

Claims (6)

1. a kind of self-energizing device of high voltage DC breaker, which is characterized in that the self-energizing device is by sequentially connected line Road taking energy unit (5), high-frequency inverter circuit (14), high frequency transformer (6), magnetic ring transformer (8) and regulator rectifier circuit (15) It constitutes;
The route taking energy unit (5) obtains energy from the main branch of dc circuit breaker and supplies for transfer branch submodule driving Electricity;The route taking energy unit (5) is constituted by two bridge arms are in parallel with a capacitor, and the bridge arm is by a diode and one Switching tube with anti-paralleled diode is in series, and the tie point access high voltage direct current of the diode and the switching tube is disconnected In the main branch of road device, the capacitor both ends are connected to the high-frequency inverter circuit (14);
The high-frequency inverter circuit (14) is input, output high-frequency current to the height with the capacitance terminal of route taking energy unit (5) Frequency power transformer (6).
2. the self-energizing device of high voltage DC breaker according to claim 1, which is characterized in that the high frequency transformer (6) primary and secondary side is respectively a winding and more than one winding.
3. the self-energizing device of high voltage DC breaker according to claim 2, which is characterized in that the high frequency transformer (6) primary side connects high-frequency inverter circuit (14), and secondary side output is connected to magnetic ring transformer (8) by high-tension cable.
4. the self-energizing device of high voltage DC breaker according to claim 2, which is characterized in that the self-energizing device packet Include the full-bridge submodule (7) connecting with the regulator rectifier circuit (15).
5. a kind of implementation method of the self-energizing device of high voltage DC breaker, the self-energizing device is the claims 1- The self-energizing device of high voltage DC breaker described in 4 any one claims, which is characterized in that the self-energizing device Implementation method the following steps are included:
The route taking energy unit (5) is serially connected in the main branch of the high voltage DC breaker, from the main branch by S1 Energy is obtained in electric current;
S2 controls the turn-on and turn-off of the switching tube when flowing through electric current in main branch;
S3 adjusts the charging time of the capacitor to control the voltage range of the capacitor.
6. the implementation method of self-energizing device according to claim 5, which is characterized in that the voltage of the capacitor is less than institute State the conduction voltage drop of switching tube.
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CN106487043A (en) * 2015-08-26 2017-03-08 国网智能电网研究院 A kind of hybrid integrated high-level energy supplying system for high voltage DC breaker
CN106487044A (en) * 2015-08-26 2017-03-08 国网智能电网研究院 A kind of hybrid integrated high-level energy supply method for high voltage DC breaker
CN105281545B (en) * 2015-11-05 2019-08-06 许继电气股份有限公司 A kind of flexible direct current converter valve and its bridge arm damping module take can circuit
CN105576953A (en) * 2016-01-04 2016-05-11 许继电气股份有限公司 Modular multilevel converter (MMC) flexible DC converter valve and submodule power taking circuit thereof
CN106533145B (en) * 2016-11-22 2019-10-15 平高集团有限公司 A kind of high voltage DC breaker
CN109560527A (en) * 2018-12-10 2019-04-02 国网江苏省电力有限公司经济技术研究院 A kind of hybrid online electricity-fetching method of dc circuit breaker driving circuit
CN110726915B (en) * 2019-08-28 2020-08-18 重庆大学 Modular multilevel converter valve submodule IGBT fault detection system and method
CN111130152B (en) * 2020-01-06 2021-05-07 长沙理工大学 Stable energy taking device for high-voltage power transmission line and application method thereof

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