CN109560532A - A kind of flexible direct current multilevel converter bridge arm over-current protection method - Google Patents
A kind of flexible direct current multilevel converter bridge arm over-current protection method Download PDFInfo
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- CN109560532A CN109560532A CN201710887299.0A CN201710887299A CN109560532A CN 109560532 A CN109560532 A CN 109560532A CN 201710887299 A CN201710887299 A CN 201710887299A CN 109560532 A CN109560532 A CN 109560532A
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- bridge arm
- locking
- current
- flexible direct
- multilevel converter
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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
- H02H7/10—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 for converters; for rectifiers
- H02H7/12—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 for converters; for rectifiers for static converters or rectifiers
- H02H7/122—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 for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
- Inverter Devices (AREA)
Abstract
The present invention relates to a kind of flexible direct current multilevel converter bridge arm over-current protection methods, it is included in configuration bridge arm over-current detection in upper layer Protection control system or valve base electronic device, or configure bridge arm over-current detection simultaneously in upper layer Protection control system and valve base electronic device, by detection connection bridge arm, whether overcurrent is individually latched this bridge arm, definite value can be latched by the way that different overcurrents is arranged in the valve base electronic device that different bridge arms control, realize that this bridge arm is individually latched, or the independent locking of the VBC device of each bridge arm is realized by six different locking channels in the Protection control system of upper layer.
Description
Technical field
The invention belongs to direct current transportation field, in particular to a kind of flexible direct current multilevel converter bridge arm overcurrent protection side
Method.
Background technique
Flexible DC transmission uses voltage source converter, can exchange system with separately adjustable active and idle transmission, raising
The ability to transmit electricity of system, is readily configured multi-terminal direct current transmission system, the electricity generation grid-connecting of renewable energy, isolated island urban electricity supply and
The application fields such as AC system interconnection, have apparent competitiveness.
Flexible direct current ac bus or valve area failure, cause failure bridge arm current and bridge arm current change rate to compare
Greatly, bridge arm submodule unit overcurrent damage may be caused, valve control electronic equipment detection bridge arm current is needed to be protected, it is existing
Mode be protect system to carry out global closedown mode by top level control, once any one bridge arm overcurrent of detection, is integrally closed
All bridge arms are locked, but this mode may will affect whole system power transmission and cause DC side overvoltage, under serious conditions
May result in Permanent lockout, thus solved by the way of simple, economical voltage-source type multilevel converter ac bus or
Protection is provided when person's bridge arm breaks down and guarantees flexible direct current system continuous service target again simultaneously, is had great importance.
Summary of the invention
The purpose of the present invention is to provide a kind of flexible direct current multilevel converter bridge arm over-current protection method, can keep away
Exempt from multiple bridge arms while being latched, is individually latched bridge arm current spike when failure is eliminated in each bridge arm protection.
In order to achieve the above objectives, solution of the invention is:
A kind of flexible direct current multilevel converter bridge arm over-current protection method is distinguished in the valve control electronic equipment of each bridge arm
Detect each bridge arm current perhaps top level control protection system detect respectively each bridge arm current or valve control electronic equipment with it is upper
Layer Control protection system detects each bridge arm current simultaneously, and all configures bridge arm overcurrent protection, and the result of the action of protection is exactly every
A bridge arm is latched this bridge arm, the valve control electronics that the independent locking channel of each bridge arm is connected by the bridge arm by individually detecting overcurrent
Equipment provides, or provides the locking channel of individual six bridge arms by Control protection system.
Further, the valve control electronic equipment of the bridge arm connection provides whether individually locking channel specifically refers to the bridge arm
Locking detects whether overcurrent individually by the valve control electronic equipment of this bridge arm to determine, the locking of a bridge arm does not influence other bridge arms
Operation.
Further, the locking channel that the Control protection system provides individual six bridge arms specifically refers to, a bridge arm
Locking protect system to provide individually locking channel by top level control, it is logical to provide six lockings by top level control protection system
Road is latched six bridge arms to valve control equipment or six, a channel point respectively.
Further, different locking definite values is set in the valve control electronic equipment of each bridge arm.
Further, identical locking definite value is set in the valve control electronic equipment of each bridge arm.
Further, the block signal of bridge arm is pulse or level signal.
Further, wherein one or several turn-off devices in all modules of one bridge arm of selection locking, it is remaining
Other turn-off devices are then in unlock investment or excision state.
Further, all modules of one bridge arm of selection locking.
Further, when upper layer, Protection control system detects that the number of locking bridge arm is more than or equal to setting number k or appoints
The blocking time of a bridge arm of anticipating is more than setting time t, can be latched simultaneously by top level control system to six bridge arms.
Further, between the setting number k value 2~6；The setting time t >=100us.
After adopting the above scheme, the invention has the benefit that
(1) the more level converter valve bridge arm overcurrent protection processing methods of flexible HVDC transmission system provided by the invention utilize
Valve control electronic equipment is individually latched bridge arm current spike when failure is eliminated in each bridge arm protection；
(2) different locking definite values is arranged in each bridge arm, can be latched simultaneously to avoid multiple bridge arms, can close to avoid whole
The problem of over-voltage caused by locking or power transmission are interrupted.
Detailed description of the invention
The protection of Fig. 1 top level control and valve control, module connection type A；
The protection of Fig. 2 top level control and valve control, module connection type B；
The protection of Fig. 3 top level control and valve control, module connection diagram C.
Specific embodiment
A kind of flexible direct current multilevel converter bridge arm over-current protection method is distinguished in the valve control electronic equipment of each bridge arm
Detect each bridge arm current perhaps top level control protection system detect respectively each bridge arm current or valve control electronic equipment with it is upper
Layer Control protection system detects each bridge arm current simultaneously, and all configures bridge arm overcurrent protection, and the result of the action of protection is exactly every
A bridge arm is latched this bridge arm by individually detecting overcurrent, and whether other bridge arms, which are latched not, influences the operation of this bridge arm, each bridge arm
The valve control electronic equipment that individually locking channel can be bridge arm connection provides or Control protection system provides individual six
The locking channel of a bridge arm.Illustrated separately below with attached drawing 1,2,3, attached drawing 1,2,3 is top level control protection and valve control respectively
Three kinds of system, module connection types.
301 system is protected for top level control in 101, Fig. 2 and Fig. 3 in Fig. 1, valve control device is 102 and Fig. 2 in Fig. 1,3
In 302, Fig. 1 in 303 be power module in 103, Fig. 2 and Fig. 3.
A kind of above-mentioned flexible direct current multilevel converter bridge arm over-current protection method, bridge arm (103 in Fig. 1, and
303 in Fig. 2 and 3) locking does not influence the operation of other bridge arms, and whether which is latched the valve control electronic equipment by this bridge arm
Individually overcurrent is detected whether to determine.
A kind of above-mentioned flexible direct current multilevel converter bridge arm over-current protection method, the locking of a bridge arm can also lead to
It crosses top level control protection system and individually locking channel is provided, top level control protects system to provide six locking channels to valve control
Equipment (701 in Fig. 3) or six, a channel point can be latched six bridge arms (in Fig. 1 in 202, Fig. 2 and Fig. 3 respectively
601)。
A kind of above-mentioned flexible direct current multilevel converter bridge arm over-current protection method, the valve control electronic equipment of this bridge arm
Different locking definite values can be set in (302 in 102 and Fig. 2 in Fig. 1, Fig. 3).
A kind of above-mentioned flexible direct current multilevel converter bridge arm over-current protection method, the block signal of bridge arm can be arteries and veins
Punching or level signal.
A kind of above-mentioned flexible direct current multilevel converter bridge arm over-current protection method can choose the institute of one bridge arm of locking
Have in module wherein one perhaps the remaining other turn-off devices of several turn-off devices be then in unlock investment or excision
State.
When upper layer, Protection control system detects that the number of locking bridge arm is more than or equal to k (between k value 2~6) or appoints
The blocking time of a bridge arm of anticipating is more than t (t >=100us), can be latched simultaneously by top level control system to six bridge arms.
The solution of the present invention configures bridge arm over-current detection simultaneously in upper layer Protection control system and valve base electronic device,
By detecting connection bridge arm in valve base electronic device or upper layer Protection control system, whether overcurrent is individually latched this bridge arm, can
To be latched definite value by the way that different overcurrents is arranged in the valve base electronic device that different bridge arms control, realize that this bridge arm individually closes
Lock, or realized by six different locking channels in top level control protection system each bridge arm valve control device it is independent
Locking.Bridge arm current spike when scheme proposed by the present invention can eliminate failure can be latched simultaneously to avoid multiple bridge arms, can be with
Avoid the problem that over-voltage caused by whole be latched or power transmission are interrupted.
Claims (10)
1. a kind of flexible direct current multilevel converter bridge arm over-current protection method, which is characterized in that in the valve control electricity of each bridge arm
Each bridge arm current is detected in sub- equipment respectively and perhaps detects each bridge arm current respectively or in valve control in top level control protection system
Electronic equipment and top level control protection system detect each bridge arm current simultaneously, and all configure bridge arm overcurrent protection, and protection is moved
Being exactly each bridge arm as result is latched this bridge arm by individually detecting overcurrent, and the independent locking channel of each bridge arm is connected by the bridge arm
The valve control electronic equipment connect provides, or provides the locking channel of individual six bridge arms by Control protection system.
2. a kind of flexible direct current multilevel converter bridge arm over-current protection method as described in claim 1, which is characterized in that institute
The valve control electronic equipment for stating bridge arm connection provides individually locking channel and specifically refers to whether the bridge arm is latched valve by this bridge arm
Control electronic equipment detects whether overcurrent individually to determine, the locking of a bridge arm does not influence the operation of other bridge arms.
3. a kind of flexible direct current multilevel converter bridge arm over-current protection method as described in claim 1, which is characterized in that institute
It states Control protection system the locking channels of individual six bridge arms is provided and specifically refer to, the locking of a bridge arm passes through top level control
Protection system provides individually locking channel, provides six locking channels to valve control equipment by top level control protection system, or
One six, channel point is latched six bridge arms respectively.
4. a kind of flexible direct current multilevel converter bridge arm over-current protection method as described in claim 1, which is characterized in that every
Different locking definite values is set in the valve control electronic equipment of a bridge arm.
5. a kind of flexible direct current multilevel converter bridge arm over-current protection method as described in claim 1, which is characterized in that every
Identical locking definite value is set in the valve control electronic equipment of a bridge arm.
6. a kind of flexible direct current multilevel converter bridge arm over-current protection method as claimed in claim 3, which is characterized in that bridge
The block signal of arm is pulse or level signal.
7. a kind of flexible direct current multilevel converter bridge arm over-current protection method as described in claim 1, which is characterized in that choosing
Wherein one or several turn-off devices in all modules of one bridge arm of locking are selected, remaining other turn-off devices are then located
In unlock investment or excision state.
8. a kind of flexible direct current multilevel converter bridge arm over-current protection method as described in claim 1, which is characterized in that close
Lock all modules an of bridge arm.
9. a kind of flexible direct current multilevel converter bridge arm over-current protection method as shown in claim 1, which is characterized in that when
When upper layer Protection control system detects that the number of locking bridge arm is more than or equal to the locking for setting number k or any one bridge arm
Between be more than setting time t, then six bridge arms are latched simultaneously by top level control system.
10. a kind of flexible direct current multilevel converter bridge arm over-current protection method as shown in claim 9, which is characterized in that
Between the setting number k value 2~6；The setting time t >=100us.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710887299.0A CN109560532A (en) | 2017-09-27 | 2017-09-27 | A kind of flexible direct current multilevel converter bridge arm over-current protection method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710887299.0A CN109560532A (en) | 2017-09-27 | 2017-09-27 | A kind of flexible direct current multilevel converter bridge arm over-current protection method |
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| CN109560532A true CN109560532A (en) | 2019-04-02 |
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| CN201710887299.0A Pending CN109560532A (en) | 2017-09-27 | 2017-09-27 | A kind of flexible direct current multilevel converter bridge arm over-current protection method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111262223A (en) * | 2020-03-19 | 2020-06-09 | 中国南方电网有限责任公司超高压输电公司柳州局 | Temporary locking protection configuration method and system for flexible direct-current series double valve groups |
| CN111628482A (en) * | 2020-04-27 | 2020-09-04 | 清华大学 | Current converter overcurrent protection device and method |
| CN111697542A (en) * | 2020-05-14 | 2020-09-22 | 南方电网科学研究院有限责任公司 | Control system and method for synchronous temporary locking of flexible direct-current valve group |
| CN112165242A (en) * | 2020-09-24 | 2021-01-01 | 国网冀北电力有限公司检修分公司 | Control protection system of high-voltage flexible converter valve and protection method and device thereof |
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| CN102130441A (en) * | 2011-03-16 | 2011-07-20 | 中国电力科学研究院 | Protection configuration method of flexible direct-current (DC) transmission system of modular multiple-level converter |
| CN104600672A (en) * | 2015-01-21 | 2015-05-06 | 南京南瑞继保电气有限公司 | Over-current protection configuration method and system for modular multilevel converter |
| CN104659749A (en) * | 2015-02-26 | 2015-05-27 | 南京南瑞继保电气有限公司 | Overcurrent protection method, valve-control electronic device, control protection device and detection system |
| CN105680421A (en) * | 2014-11-17 | 2016-06-15 | 南京南瑞继保电气有限公司 | Protection method for modular multilevel converter |
| US20170207630A1 (en) * | 2013-02-26 | 2017-07-20 | Nr Electric Co., Ltd | Method for incorporating non-operating station into operating system in multi-terminal flexible dc transmission system |
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Patent Citations (5)
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| CN102130441A (en) * | 2011-03-16 | 2011-07-20 | 中国电力科学研究院 | Protection configuration method of flexible direct-current (DC) transmission system of modular multiple-level converter |
| US20170207630A1 (en) * | 2013-02-26 | 2017-07-20 | Nr Electric Co., Ltd | Method for incorporating non-operating station into operating system in multi-terminal flexible dc transmission system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111262223A (en) * | 2020-03-19 | 2020-06-09 | 中国南方电网有限责任公司超高压输电公司柳州局 | Temporary locking protection configuration method and system for flexible direct-current series double valve groups |
| CN111262223B (en) * | 2020-03-19 | 2021-04-20 | 中国南方电网有限责任公司超高压输电公司柳州局 | Temporary locking protection configuration method and system for flexible direct-current series double valve groups |
| CN111628482A (en) * | 2020-04-27 | 2020-09-04 | 清华大学 | Current converter overcurrent protection device and method |
| CN111628482B (en) * | 2020-04-27 | 2022-04-19 | 清华大学 | Current converter overcurrent protection device and method |
| CN111697542A (en) * | 2020-05-14 | 2020-09-22 | 南方电网科学研究院有限责任公司 | Control system and method for synchronous temporary locking of flexible direct-current valve group |
| CN111697542B (en) * | 2020-05-14 | 2022-09-16 | 南方电网科学研究院有限责任公司 | Control system and method for synchronous temporary locking of flexible direct-current valve group |
| CN112165242A (en) * | 2020-09-24 | 2021-01-01 | 国网冀北电力有限公司检修分公司 | Control protection system of high-voltage flexible converter valve and protection method and device thereof |
| CN112165242B (en) * | 2020-09-24 | 2021-07-23 | 国网冀北电力有限公司检修分公司 | Control protection system of high-voltage flexible converter valve and protection method and device thereof |
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Application publication date: 20190402 |