CN109546632A - A kind of dc switch and its control method - Google Patents
A kind of dc switch and its control method Download PDFInfo
- Publication number
- CN109546632A CN109546632A CN201910060040.8A CN201910060040A CN109546632A CN 109546632 A CN109546632 A CN 109546632A CN 201910060040 A CN201910060040 A CN 201910060040A CN 109546632 A CN109546632 A CN 109546632A
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- China
- Prior art keywords
- energy storage
- switch
- energy
- diode
- branch
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The present invention provides a kind of dc switch and its control method, the dc switch is series in DC loop, it is characterized in that, including at least a main branch and the energy storage branch in parallel with the main branch, the main branch includes concatenated mechanical switch and electronic power switch；The energy storage branch includes concatenated switchgear and energy storage device；The energy storage device is used to store the energy in the DC loop, energy consuming circuitry built in the energy storage device, and the energy consuming circuitry has the advantages that at low cost, breaking capacity is good and stablizes practical for the energy in energy storage device described in attenuation, the present invention.
Description
Technical field
The invention belongs to power electronics fields, and in particular to a kind of dc switch and its control method.
Background technique
Flexible DC transmission based on voltage source converter have active power, reactive power can independent flexible control,
It can power to passive system, waveform quality is good, polarity of voltage the features such as having no need to change when trend is overturn, and is extensive renewable
Energy access provides effective solution.In addition, flexible DC transmission is easier to building multiterminal element and DC grid, will make
New-energy grid-connected is more flexible, efficient, reliable.But since flexible HVDC transmission system uses voltage source converter, when failure
Current-rising-rate is high, and most of voltage source converter can not remove DC Line Fault by being latched, if by alternating-current switch
Remove DC Line Fault, breaking speed is slow, and fault incidence is big, cannot selectivity excision DC Line Fault.Dc switch conduct
Failure in flexible direct current power grid quickly isolates device, is the key equipment for constructing DC grid, lacking dc switch will be very big
Ground influences the operational flexibility and power supply reliability of flexible direct current power grid, seriously restricts the development of flexible DC transmission technology and answers
With.
Dc switch is broadly divided into mechanical dc switch, solid-state direct-current switch and mixed style direct current switch at present.Machine
Tool formula dc switch creates zero crossing using inductance, capacitive tank and realizes shutdown, and on-state loss is low, compressive resistance is high, but turns off
Time needs several ms, is unable to satisfy the requirement that DC grid quickly isolates and restarts；All solid state high voltage dc switch is based on half
Conductor switching device, turn-off speed are exceedingly fast, but on-state loss is excessive, at high cost；The above two comprehensive advantages of mixed style direct current switch,
On-state loss is low and cut-offs that speed is fast, is the hot spot studied at present.But current mixed style direct current switch is all at least by main branch
Road, transfer branch and energy consumption branch are constituted, and transfer branch contains a large amount of power electronic devices, and energy consumption branch contains non-thread
Property the energy dissipation devices such as resistance, wherein power electronic devices is an important factor for influencing dc switch cost, and nonlinear resistance is shadow
An important factor for ringing dc switch reliability, and cost and the reliability two big bottlenecks that exactly dc switch promotes and applies.
In order to reduce dc switch cost and improve reliability, need to propose a kind of new dc switch and its controlling party
Method.
Summary of the invention
The object of the present invention is to provide a kind of dc switch and its control methods, are connected by switching on a small quantity with energy storage device
To replace the transfer branch of conventional hybrid formula dc switch, combined by energy storage device with linear resistance to replace conventional hybrid
The nonlinear resistance of formula dc switch may be implemented simultaneously to reduce dc switch cost and improve dc switch reliability
The breaking function of DC current.
The present invention provides the following technical solutions:
A kind of dc switch, the dc switch are series in DC loop, include at least a main branch and with it is described
The energy storage branch of main branch parallel connection, the main branch include concatenated mechanical switch and electronic power switch；The energy storage branch
Including concatenated switchgear and energy storage device；The energy storage device is used to store the energy in the DC loop, the storage
Energy consuming circuitry built in energy equipment, the energy consuming circuitry is for the energy in energy storage device described in attenuation.
Preferably, the electronic power switch includes at least two concatenated IGCT devices.
Preferably, the energy consuming circuitry includes linear resistance.
Preferably, the energy storage device includes the combination in series or in parallel of M × N number of energy-storage module, the M and the N
For positive integer.
Preferably, the energy-storage module includes capacitor and resistance in parallel.
Preferably, the energy-storage module includes concatenated diode D1, part in parallel and diode D4, the parallel connection part packet
Capacitor and resistance in parallel are included, the diode D1 is identical with the conducting direction of the diode D4；The diode D1 and institute
It states and is parallel with diode D2 on capacitor, the diode D2 is opposite with the conducting direction of the diode D1；The diode D4
There is diode D3 with the resistor in parallel, the diode D3 is opposite with the conducting direction of the diode D4.
Preferably, the capacitor keeps the port Impedance of the energy storage device variable, small in energy storage initial stage port Impedance,
It is big in energy storage ending phase port Impedance.
A kind of control method of dc switch, comprising the following steps:
S1, closing operation, comprising the following steps:
S11, the electronic power switch for being closed main branch；
S12, the mechanical switch for being closed main branch；
S2, sub-switching operation, comprising the following steps:
S21, the switchgear for being closed energy storage branch, the conducting of energy storage branch；
S22, the electronic power switch for separating main branch, electric current is begun to decline in main branch；
S23, when main branch power on flow down drop to mechanical switch rated value when, separate the mechanical switch of main branch, electric current is complete
Portion is transferred to accumulator；
S24, after energy storage branch current absolute value is reduced to pre-set value, separate energy storage branch switchgear.
The beneficial effects of the present invention are:
1, dc switch provided by the invention replaces conventional hybrid formula direct current by switching to connect with energy storage device on a small quantity
The transfer branch of switch, advantageously reduces dc switch cost；
2, dc switch provided by the invention is made up of energy storage device and linear resistance to replace conventional hybrid formula direct current
Switch non-linearity resistance reduces dc switch cost and provides dc switch reliability；
3, dc switch provided by the invention, control process are simple, reliable.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is dc switch structural schematic diagram of the present invention；
Fig. 2 is energy storage device schematic diagram one；
Fig. 3 is energy storage device schematic diagram two；
Fig. 4 is the series-parallel schematic diagram of energy-storage module；
Fig. 5 is control method flow chart of the present invention；
In the figure, it is marked as MS. main branch mechanical switch, PES. main branch electronic power switch, S. energy storage branch switch are set
It is standby, PCD. energy storage branch energy storage device.
Specific embodiment
As shown in Figs 1-4, a kind of dc switch, dc switch are series in DC loop, include at least a main branch
The energy storage branch in parallel with main branch, main branch include concatenated mechanical switch and electronic power switch；Energy storage branch includes
Concatenated switchgear and energy storage device；Energy storage device is used to store the energy in DC loop, the built-in energy consumption electricity of energy storage device
Road, energy consuming circuitry is for the energy in attenuation energy storage device.
Specifically, electronic power switch includes at least two concatenated IGCT devices, energy consuming circuitry includes linear resistance, storage
Energy equipment includes the combination in series or in parallel of M × N number of energy-storage module, and M and N are positive integer.
Specifically, energy-storage module includes capacitor and resistance in parallel.
Specifically, energy-storage module includes concatenated diode D1, part in parallel and diode D4, part in parallel includes in parallel
Capacitor and resistance, diode D1 are identical with the conducting direction of diode D4；It is parallel with diode D2 on diode D1 and capacitor, two
Pole pipe D2 is opposite with the conducting direction of diode D1；Diode D4 and resistor in parallel have diode D3, diode D3 and two poles
The conducting direction of pipe D4 is opposite；Capacitor keeps the port Impedance of energy storage device variable, small in energy storage initial stage port Impedance, is storing up
Energy ending phase port Impedance is big.
As shown in figure 5, a kind of control method of dc switch, comprising the following steps:
S1, closing operation, comprising the following steps: S11, the electronic power switch for being closed main branch；S12, closure main branch
Mechanical switch；
S2, sub-switching operation, comprising the following steps: S21, the switchgear for being closed energy storage branch, the conducting of energy storage branch；S22,
The electronic power switch of main branch is separated, electric current is begun to decline in main branch；S23, it drops to machinery when main branch powers on to flow down and opens
When closing rated value, the mechanical switch of main branch is separated, electric current is fully transferred to accumulator；S24, when energy storage branch current it is absolute
After value is reduced to pre-set value, the switchgear of energy storage branch is separated.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, although referring to aforementioned reality
Applying example, invention is explained in detail, for those skilled in the art, still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features.It is all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of dc switch, the dc switch is series in DC loop, which is characterized in that includes at least a main branch
The energy storage branch in parallel with the main branch, the main branch include concatenated mechanical switch and electronic power switch；It is described
Energy storage branch includes concatenated switchgear and energy storage device；The energy storage device is used to store the energy in the DC loop
Amount, energy consuming circuitry built in the energy storage device, the energy consuming circuitry is for the energy in energy storage device described in attenuation.
2. a kind of dc switch according to claim 1, which is characterized in that the electronic power switch includes at least two
Concatenated IGCT device.
3. a kind of dc switch according to claim 1, which is characterized in that the energy consuming circuitry includes linear resistance.
4. a kind of dc switch according to claim 1, which is characterized in that the energy storage device includes M × N number of energy storage mould
The combination in series or in parallel of block, the M and the N are positive integer.
5. a kind of dc switch according to claim 4, which is characterized in that the energy-storage module include in parallel capacitor and
Resistance.
6. a kind of dc switch according to claim 4, which is characterized in that the energy-storage module includes concatenated diode
D1, part in parallel and diode D4, the parallel connection part include the capacitor and resistance of parallel connection, the diode D1 and the diode
The conducting direction of D4 is identical；Diode D2, the diode D2 and described two are parallel on the diode D1 and the capacitor
The conducting direction of pole pipe D1 is opposite；The diode D4 and the resistor in parallel have diode D3, the diode D3 and institute
The conducting direction for stating diode D4 is opposite.
7. a kind of dc switch according to claim 5 or 6, which is characterized in that the capacitor makes the energy storage device
Port Impedance is variable, small in energy storage initial stage port Impedance, big in energy storage ending phase port Impedance.
8. a kind of control method of dc switch, which comprises the following steps:
S1, closing operation, comprising the following steps:
S11, the electronic power switch for being closed main branch；
S12, the mechanical switch for being closed main branch；
S2, sub-switching operation, comprising the following steps:
S21, the switchgear for being closed energy storage branch, the conducting of energy storage branch；
S22, the electronic power switch for separating main branch, electric current is begun to decline in main branch；
S23, when main branch power on flow down drop to mechanical switch rated value when, separate main branch mechanical switch, electric current all turn
Move to accumulator；
S24, after energy storage branch current absolute value is reduced to pre-set value, separate energy storage branch switchgear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910060040.8A CN109546632A (en) | 2019-01-22 | 2019-01-22 | A kind of dc switch and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910060040.8A CN109546632A (en) | 2019-01-22 | 2019-01-22 | A kind of dc switch and its control method |
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| Publication Number | Publication Date |
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| CN109546632A true CN109546632A (en) | 2019-03-29 |
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| CN201910060040.8A Pending CN109546632A (en) | 2019-01-22 | 2019-01-22 | A kind of dc switch and its control method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106099878A (en) * | 2016-08-04 | 2016-11-09 | 华中科技大学 | A kind of electric capacity charge type bidirectional, dc chopper and application thereof |
| CN109066611A (en) * | 2018-08-22 | 2018-12-21 | 华北电力大学 | A kind of dc circuit breaker circuit topology and control method |
| CN209389701U (en) * | 2019-01-22 | 2019-09-13 | 南京合智电力科技有限公司 | A kind of dc switch |
-
2019
- 2019-01-22 CN CN201910060040.8A patent/CN109546632A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106099878A (en) * | 2016-08-04 | 2016-11-09 | 华中科技大学 | A kind of electric capacity charge type bidirectional, dc chopper and application thereof |
| CN109066611A (en) * | 2018-08-22 | 2018-12-21 | 华北电力大学 | A kind of dc circuit breaker circuit topology and control method |
| CN209389701U (en) * | 2019-01-22 | 2019-09-13 | 南京合智电力科技有限公司 | A kind of dc switch |
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