CN109449917A - A kind of current limiter suitable for the configuration of bi-directional current direct current system decentralized capacitance - Google Patents
A kind of current limiter suitable for the configuration of bi-directional current direct current system decentralized capacitance Download PDFInfo
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- CN109449917A CN109449917A CN201811209756.1A CN201811209756A CN109449917A CN 109449917 A CN109449917 A CN 109449917A CN 201811209756 A CN201811209756 A CN 201811209756A CN 109449917 A CN109449917 A CN 109449917A
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- bridge arm
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The present invention relates to a kind of current limiter suitable for the configuration of bi-directional current direct current system decentralized capacitance, the H-bridge circuit constituted including two diode bridge arms, two switch bridge arms and a middle branch；Diode bridge arm and middle branch are connected in series by Power Diode Pumped；Switch bridge arm is connected in series by the switch element that one-way conduction can turn off, and collector, anode or drain electrode one end of bridge arm are known as bridge arm anode, and emitter, cathode or source electrode one end of bridge arm are known as bridge arm cathode；Two diode bridge arm common cathodes；Switch bridge arm cathode is connected with one of diode bridge arm anode respectively, and switch bridge arm is positive altogether and is connected with capacitor anode；Middle branch cathode is connect with the common point of diode bridge arm, and middle branch anode is connect with the common point of switch bridge arm.Two common points of diode bridge arm and switch bridge arm, one of connection DC bus, another connection DC line.
Description
Technical field
The present invention relates to direct current systems to control protection field.More particularly to being suitable for, the dispersion of bi-directional current direct current system is electric
Hold the current limiter of configuration.
Background technique
DC grid fault traversing is the important topic of DC system protection control.Due to direct fault current rise it is fast,
Peak point current is big, and DC Line Fault is caused to cut-off difficulty, endangers direct current system and equipment big.Therefore, research and utilization DC grid
Failure current limit technology reduces fault current levels, delays fault progression, passes through to DC system fault, stable operation has important meaning
Justice.Currently, the research of DC system fault current limliting principle and equipment has reactor to increase fault loop damping as starting point
The schemes such as current limliting, solid-state current limliting, superconducting current-limiting using fault current limiting level and are minimized to normal system influence on system operation as mesh
Mark.Direct current system decentralized capacitance configuration method in each route head end distribution configuration shunt capacitance being connected with bus, and adds two
Pole pipe guarantees the one-way flow general character；This method provides the capacitor total capacity of short circuit current by reducing, and is not increasing loop damping
In the case of reduce fault current levels.This method requires DC line trend to have one-way, for traditional radial distribution
It is applicable for net, but is unfavorable in DC distribution net access the microgrid containing distributed generation resource --- its interconnection usually requires that
Trend has the bidirectional flow general character.In view of the above problems, direct current system decentralized capacitance configuration method need to be improved, research the relevant technologies and
Equipment is allowed to meet different application scene, in favor of the popularization and application of this method.
Summary of the invention
Difficult problem, and direct current system decentralized capacitance configuration method itself are cut-off for DC grid direct fault current
It is only applicable to unidirectional trend network, the present invention proposes that a kind of current limliting suitable for the configuration of bi-directional current direct current system decentralized capacitance is set
It is standby, and the strategy to restore electricity after corresponding trend commutation control, fault traversing control and fault clearance is given, reducing event
While hindering levels of current, the bidirectionally conductive ability of DC current when guaranteeing to operate normally.Technical solution is as follows:
A kind of current limiter suitable for the configuration of bi-directional current direct current system decentralized capacitance, including two diode bridge arms,
The H-bridge circuit that two switch bridge arms and a middle branch are constituted；Diode bridge arm and middle branch are connected by Power Diode Pumped
It forms；Switch bridge arm is connected in series by the switch element that one-way conduction can turn off, and collector, anode or drain electrode one end of bridge arm claim
For bridge arm anode, emitter, cathode or source electrode one end of bridge arm are known as bridge arm cathode；Two diode bridge arm common cathodes；Switch
Bridge arm cathode is connected with one of diode bridge arm anode respectively, and switch bridge arm is positive altogether and is connected with capacitor anode；In
Between branch cathode connect with the common point of diode bridge arm, middle branch anode with switch bridge arm common point connect.Diode
Two common points of bridge arm and switch bridge arm, one of connection DC bus, another connection DC line；If switching bridge arm
Do not have fault current connecting-disconnecting function, then increases dc circuit breaker between H-bridge circuit and bus.
The equipment, if direction of tide is that bus flows to route, disconnects the switch bridge arm close to bus when operating normally,
It is closed the switch bridge arm close to route；If direction of tide is that route flows to bus, it is closed the switch bridge arm close to bus, disconnection is leaned on
The switch bridge arm near line road.In trend commutation, before DC current zero passage, touching is provided to the switch bridge arm originally disconnected in advance
Continuity signal is sent out, in current over-zero or later, provides cut-off signals to the switch bridge arm be connected before commutation.The equipment connects
When short trouble occurs for the DC line or DC bus entered, dc circuit breaker is first disconnected, then disconnect opening in closed state
Close bridge arm.After line fault is removed, it is closed corresponding switch bridge arm, recloses dc circuit breaker.If being overlapped trend after route
Direction is that bus flows to route, need to increase in the loop start-up resistor before close circuit breaker, and power flow stability is moved back except starting electricity
Resistance.
The current limiter for being suitable for bi-directional current DC grid capacitor and being distributed of the invention, and the corresponding control proposed
System strategy solves the problems, such as that DC grid decentralized capacitance configuration method is not suitable under bi-directional current, reduces fault current
Level thereby reduces the requirement that speed and capacity are cut-off to breaker, enhances DC system fault ride-through capability；It reduces
Non-fault line Voltage Drop degree is advantageous to its fault traversing；Since breaker only plays disconnecting switch in a part of situation
Effect, without cut-offfing fault current, Fault Isolation is realized by the one-way conduction of diode, enhances its reliability.
Detailed description of the invention
Fig. 1 is the direct current system route head end schematic diagram of decentralized capacitance configuration, (1a) breaker in the line side of capacitor,
Bus bar side of (1b) breaker in capacitor.
Fig. 2 is the current limiter topological diagram configured suitable for bi-directional current direct current system decentralized capacitance, and (2a) switchs bridge arm
Has topology when fault current connecting-disconnecting function, (2b) switch bridge arm does not have topology when fault current connecting-disconnecting function.
Fig. 3 is the trend commutation control schematic diagram of the equipment, before (3a) commutation, (3b) current over-zero, after (3c) commutation.
Fig. 4 is the line fault control schematic diagram of (2a) topology of corresponding diagram 2, and (4a) (4b) direction of tide is bus flow direction
Route, (4c) (4d) are that route flows to bus.
Fig. 5 is to be overlapped control schematic diagram after the line fault of (2a) topology of corresponding diagram 2 is removed, (5a) (5b) direction of tide
Route is flowed to for bus, (5c) (5d) is that route flows to bus.
Fig. 6 is the bus-bar fault control schematic diagram of (2a) topology of corresponding diagram 2, and (6a) (6b) direction of tide is bus flow direction
Route, (6c) (6d) are that route flows to bus.
Fig. 7 is the line fault control schematic diagram of (2b) topology of corresponding diagram 2, and (7a)-(7d) direction of tide is bus stream
To route, (7e) (7f) is that route flows to bus.
Fig. 8 is to be overlapped control schematic diagram after the line fault of (2b) topology of corresponding diagram 2 is removed, the trend side (8a)-(8d)
Route is flowed to for bus, (8e)-(8g) is that route flows to bus.
Fig. 9 is the bus-bar fault control schematic diagram of (2b) topology of corresponding diagram 2, and (9a) (9b) direction of tide is bus flow direction
Route, (9c)-(9e) are that route flows to bus.
Specific embodiment
The present invention will be described with reference to the accompanying drawings and examples.
1., if Line Flow is one-way flow, being used in DC line head end for the direct current system of decentralized capacitance configuration
Such as the structure of Fig. 1 (1a) or Fig. 1 (1b), to fault current limiting, box indicates dc circuit breaker in figure.
2. a kind of current limiter topology suitable for the configuration of bi-directional current direct current system decentralized capacitance proposed by the present invention is such as
Fig. 2.1 and 2 be diode bridge arm in figure, and 3 and 4 be switch bridge arm, and 5 be middle branch, and 6 be dc circuit breaker in figure (2b).Its
Middle figure (2a) corresponding diagram (1a)；Scheme (2b) corresponding diagram (1b), is dc circuit breaker between H bridge and bus.
Bridge arm 1, bridge arm 2 and middle branch 5 are made of N number of Diode series, to meet pressure-resistant demand.Bridge arm 1 and bridge arm 2
Common cathode, 5 cathode of middle branch connect capacitor anode.
When switch bridge arm has forward current connecting-disconnecting function, using the structure as shown in figure (2a), bridge arm is switched at this time
It is made of M solid-state switch unit, to meet pressure resistance and cut-off demand, Breaking capacity connects capacitor according to H-bridge circuit may
The maximum fault current of offer designs.Solid-state switch unit can turn off solid-state switch by one-way conduction and constitute, figure (2a) in
IGBT series diode is example.
When switch bridge arm does not have current breaking capacity, using the structure as shown in figure (2b), set between H bridge and bus
Dc circuit breaker 6 is set, Breaking capacity is designed according to the maximum fault current that converter station may provide.Switch bridge arm is by having isolation
The switch element of ability is constituted, such as direct-current isolating switch, DC load switch.
3. present device trend commutation control such as Fig. 3.Such as figure (3a), system load flow flows to bus by bus i before commutating
J, bridge arm 3 and bridge arm 3 ' are in an open state, and bridge arm 4 and bridge arm 4 ' are closed state.Such as figure (3b), line current is i.e. by zero passage
When, it is closed bridge arm 3 and bridge arm 3 ', is prepared for commutation.Such as figure (3c), at route current zero-crossing point or moment later, bridge is opened
Arm 4 and bridge arm 4 ' complete the change of current；Note that trend is steady when opening bridge arm 4 if system control and switching speed do not reach requirement
It is fixed, then bridge arm is switched without using disconnecting switch.
4. when using such as topology of figure (2a):
Line fault passes through control such as Fig. 4 and such as schemes (4a) (4b) if trend is that bus flows to route before failure, open bridge
Arm 4 cut-offs fault current；If trend is that route flows to bus before failure, such as schemes (4c) (4d), open 3 isolated fault of bridge arm.
Line fault is overlapped control such as Fig. 5 and such as schemes (5a) (5b) if trend is that bus flows to route after being overlapped after removing,
Capacitor has reached voltage rating before being overlapped, and is closed bridge arm 4；If trend is that route flows to bus after being overlapped, such as (5c) (5d) is schemed,
Capacitor has charged before this, is closed bridge arm 3.
Bus-bar fault isolation control such as Fig. 6 such as schemes (6a) (6b), opens bridge if trend is that bus flows to route before failure
4 isolated fault of arm；If trend is that route flows to bus before failure, such as schemes (6c) (6d), open bridge arm 3.
5. when using such as topology of figure (2b):
Line fault passes through control such as Fig. 7 and such as schemes (7a)-figure (7d), first if trend is that bus flows to route before failure
Breaker 6 is opened, capacitor is discharged to energy storage and exhausts, and hereafter opens 4 isolated fault of bridge arm；If trend is that route flow direction is female before failure
Line such as schemes (7e) (7f), opens breaker 6 and 3 isolated fault of bridge arm.
Line fault is overlapped control such as Fig. 8 and such as schemes (8a)-figure if trend is that bus flows to route after being overlapped after removing
(8d) is closed bridge arm 4 first and start-up resistor is added in the loop, then close circuit breaker 6 due to needing first to capacitor charging,
Start-up resistor is gradually removed after power flow stability；If trend is that route flows to bus after being overlapped, (8e)-figure (8g) is such as schemed, before this
Capacitor has reached voltage rating, is closed bridge arm 3, recloses breaker 6.
Bus-bar fault isolation control such as Fig. 9 such as schemes (9a) (9b) if trend is that bus flows to route before failure, opens disconnected
4 isolated fault of road device 6 and bridge arm；If trend is that route flows to bus before failure, such as schemes (9c)-figure (9e), be first turned on open circuit
Device 6 opens bridge arm 3 after cut-offfing completely.
Claims (4)
1. a kind of current limiter suitable for the configuration of bi-directional current direct current system decentralized capacitance, including two diode bridge arms, two
The H-bridge circuit that a switch bridge arm and a middle branch are constituted；Diode bridge arm and middle branch connected by Power Diode Pumped and
At；Switch bridge arm is connected in series by the switch element that one-way conduction can turn off, and collector, anode or drain electrode one end of bridge arm are known as
Bridge arm anode, emitter, cathode or source electrode one end of bridge arm are known as bridge arm cathode；Two diode bridge arm common cathodes；Switch bridge
Arm cathode is connected with one of diode bridge arm anode respectively, and switch bridge arm is positive altogether and is connected with capacitor anode；It is intermediate
Branch cathode is connect with the common point of diode bridge arm, and middle branch anode is connect with the common point of switch bridge arm.Diode bridge
Two common points of arm and switch bridge arm, one of connection DC bus, another connection DC line；If switching bridge arm not
Have fault current connecting-disconnecting function, then increases dc circuit breaker between H-bridge circuit and bus.
2. current limiter according to claim 1, which is characterized in that the equipment is when operating normally, if direction of tide
Route is flowed to for bus, disconnects the switch bridge arm close to bus, is closed the switch bridge arm close to route；If direction of tide is route
Bus is flowed to, the switch bridge arm close to bus is closed, disconnects the switch bridge arm close to route.
3. current limiter according to claim 1, which is characterized in that in trend commutation, before DC current zero passage, mention
It is preceding to provide triggering and conducting signal to the switch bridge arm originally disconnected, in current over-zero or later, opened to what is be connected before commutation
It closes bridge arm and cut-off signals is provided.
4. current limiter according to claim 1, which is characterized in that the DC line or DC bus of the equipment access
When short trouble occurs, dc circuit breaker is first disconnected, then disconnect the switch bridge arm in closed state.After line fault is removed,
It is closed corresponding switch bridge arm, recloses dc circuit breaker.It, need to be if being overlapped direction of tide after route is that bus flows to route
Increase start-up resistor before close circuit breaker in the loop, power flow stability is moved back except start-up resistor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811209756.1A CN109449917A (en) | 2018-10-17 | 2018-10-17 | A kind of current limiter suitable for the configuration of bi-directional current direct current system decentralized capacitance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811209756.1A CN109449917A (en) | 2018-10-17 | 2018-10-17 | A kind of current limiter suitable for the configuration of bi-directional current direct current system decentralized capacitance |
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| CN109449917A true CN109449917A (en) | 2019-03-08 |
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| CN201811209756.1A Pending CN109449917A (en) | 2018-10-17 | 2018-10-17 | A kind of current limiter suitable for the configuration of bi-directional current direct current system decentralized capacitance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113852058A (en) * | 2021-09-23 | 2021-12-28 | 广东电网有限责任公司 | Bidirectional current-limiting direct current limiter |
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|---|---|---|---|---|
| CN103972855A (en) * | 2013-01-31 | 2014-08-06 | 南京南瑞继保电气有限公司 | Two-way line current breaking device and control method thereof |
| US20170047727A1 (en) * | 2014-02-27 | 2017-02-16 | Nr Electric Co., Ltd | Direct-current power transmission protection device, converter and protection method |
| CN108092243A (en) * | 2017-12-11 | 2018-05-29 | 中国科学院电工研究所 | A kind of hybrid dc circuit breaker of capacitive buffer type |
| CN108400701A (en) * | 2018-04-24 | 2018-08-14 | 国网冀北电力有限公司电力科学研究院 | A kind of flexible direct current power transmission system |
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2018
- 2018-10-17 CN CN201811209756.1A patent/CN109449917A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103972855A (en) * | 2013-01-31 | 2014-08-06 | 南京南瑞继保电气有限公司 | Two-way line current breaking device and control method thereof |
| US20170047727A1 (en) * | 2014-02-27 | 2017-02-16 | Nr Electric Co., Ltd | Direct-current power transmission protection device, converter and protection method |
| CN108092243A (en) * | 2017-12-11 | 2018-05-29 | 中国科学院电工研究所 | A kind of hybrid dc circuit breaker of capacitive buffer type |
| CN108400701A (en) * | 2018-04-24 | 2018-08-14 | 国网冀北电力有限公司电力科学研究院 | A kind of flexible direct current power transmission system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113852058A (en) * | 2021-09-23 | 2021-12-28 | 广东电网有限责任公司 | Bidirectional current-limiting direct current limiter |
| CN113852058B (en) * | 2021-09-23 | 2023-09-01 | 广东电网有限责任公司 | Bidirectional current-limiting direct current limiter |
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Application publication date: 20190308 |