CN109038518A - A kind of fixed value adjusting and movement fitting method of multiterminal element route protection - Google Patents
A kind of fixed value adjusting and movement fitting method of multiterminal element route protection Download PDFInfo
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- CN109038518A CN109038518A CN201810952698.5A CN201810952698A CN109038518A CN 109038518 A CN109038518 A CN 109038518A CN 201810952698 A CN201810952698 A CN 201810952698A CN 109038518 A CN109038518 A CN 109038518A
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- fixed value
- converting plant
- value adjusting
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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
-
- 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
- H02H7/261—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 involving signal transmission between at least two stations
-
- 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
- H02H3/006—Calibration or setting of parameters
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- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses a kind of fixed value adjusting of multiterminal element route protection and movement fitting methods; fixed value adjusting method includes both ends operation fixed value adjusting method and multiterminal operation fixed value adjusting method; movement fitting method includes building multi-terminal direct current transmission system, carries out definite value to the system constructed based on above-mentioned multiterminal element route protection definite value method and after the converting plant in system is connected to route protection movement, the movement of bus rod differential protection and pole protection signal, carries out corresponding converter valve as the case may be and force phase shift, pole stoppage in transit or reboot operation；The valued methods are able to solve problem of the multiterminal element route protection in terms of fixed value adjusting and protection act selectivity; based on the fixed value adjusting and movement fitting method; it can guarantee equipment and personal safety, improve the operational reliability of multi-terminal direct current transmission system, there is stronger operability.
Description
Technical field
The present invention relates to the fixed value adjustings of technical field of power systems more particularly to a kind of multiterminal element route protection and dynamic
Make fitting method.
Background technique
Show that DC system fault is mainly DC line fault according to statistics, therefore, reliable DC line protection for
Ensure the significant of HVDC transmission system safety.Different from both ends direct current system, MTDC transmission system includes a plurality of straight
How Flow Line ensures that DC line protection action message is the critical issue of MTDC transmission system protection.
In multi-terminal direct current transmission system, different DC lines is usually connected by bus rod in DC converter station
It connects.DC line fault is due to being mostly transient fault, after DC line protection judgement is out of order and is exported, generallys use straight
Stream failure restarts strategy, i.e., DC line electric current is reduced to zero, and DC voltage is down to zero or even negative pressure, to realize free removing
The purpose of transient fault.But bus rod is located in station, is mostly permanent fault in case of ground fault, once occurring should
Class failure, MTDC transmission system should stop transport, to ensure equipment and interior operations staff's personal safety of standing.Bus rod usually configures remittance
Bus differential protecting is flowed, i.e., it is poor to make using the electric current of a plurality of DC line, to judge whether failure is located at bus rod region.It changes
Usually configuring direct current pole protection in the station of stream station, protects converter station internal fault.
In two end systems, usually it is failure to actuate according to station smoothing reactor valve side error protection, as fixed value adjusting
Principle.But in multi-terminal system, due to system operation mode complexity, fault characteristic is distributed more widely, each converter station route protection
The cooperation of definite value is difficult.If definite value adjusts lower failure in bus rod even adjacent converter station, may make
Cost station track road false protection；If definite value adjusts higher, online great distance end fault condition down going wave protection of route protection etc.
The route protection of quick action may tripping.
If mismate on multi-ended circuit protection definite value and protection act may cause in bus rod or converter station
Under fault condition, failure is executed according to route protection movement and restarts strategy, threatens change of current station equipment and personal safety；Or
Under route fault condition, route protection can not quick acting.In order to solve the above-mentioned problem of multiterminal element route protection, it would be highly desirable to
Study coordinated scheme of the multiterminal element route protection in terms of protection definite value and protection act.
Summary of the invention
The fixed value adjusting and movement fitting method of a kind of multiterminal element route protection provided by the invention, the valued methods energy
Enough solve the problems, such as multiterminal element route protection in terms of definite value, the operating method based on the valued methods, it is ensured that equipment and
Personal safety improves the operational reliability of multi-terminal direct current transmission system, has stronger operability.
To achieve the above object, the present invention provides a kind of fixed value adjusting of multiterminal element route protection and movement cooperation sides
Method, specific as follows:
A kind of fixed value adjusting method of multiterminal element route protection, including both ends operation fixed value adjusting method and multiterminal operation
Fixed value adjusting method, wherein both ends run valued methods be DC line protection area include our station DC line electric current measuring point extremely
To the DC line and all devices between the smoothing reactor of station, fixed value adjusting principle is adjacent converter station smoothing reactor valve side
Error protection is failure to actuate；Multiterminal operation valued methods are the DC line protection retained under the method for operation of adjacent converter station both ends,
Exit the DC line protection under the method for operation of non-adjacent converter station both ends；Increase by one section of traveling-wave protection in converting plant, protects model
Next route can be further extended by enclosing, and fixed value adjusting principle is that the protection of adjacent converter station AC fault is failure to actuate.
A kind of movement fitting method of multiterminal element route protection, including construct multi-terminal direct current transmission system, based on above-mentioned
Multiterminal element route protection definite value method definite value is carried out to the system that has constructed and when the converting plant in system is connected to protection
Corresponding operating is carried out after action signal, the specific operation method is as follows:
When converting plant is connected to the line fault reset command of our station or other streamline line protection devices transmission of standing erectly, then basis
The converter valve of line fault reset command control converting plant forces phase shift；
During converting plant phase shift, if receiving bus rod differential protection action signal, pole emergency outage is issued
Order, all converter stations execute pole and stop transport；
During converting plant phase shift, if receiving other converter station pole protection signals, when failure converter station is system
Uniquely in fortune converting plant or uniquely in fortune Inverter Station, then pole locking order is executed；If failure converter station is not uniquely whole in fortune
Stream station is not uniquely then to execute isolated fault converter station reset command again in fortune Inverter Station；
During converting plant phase shift, if not receiving the signal of other converter station poles protection and bus rod protection act,
Waiting was gone after the free time, is restarted strategy execution valve by line fault and is restarted order and subsequent operation.
Preferentially, the multi-terminal direct current transmission system includes: M converting plant and N number of Inverter Station, wherein M and N is big
In or equal to 1 integer, M+N is integer more than or equal to 3, and different DC lines are connected to bus rod, the confluence mother
Line is located in some Converter Station.
Preferentially, the converter station includes pole control device, line protective devices and electrode protector, the pole of different converter stations
Control device establishes communication connection between any two, and the line protective devices of different converter stations establish communication connection between any two；It is same
Communication connection is mutually established between electrode protector, line protective devices and pole control device in Converter Station.
The fixed value adjusting and movement fitting method of a kind of multiterminal element route protection provided by the invention, valued methods description
Both ends and route protection range and setting principle under multiterminal operating condition, the valued methods are able to solve multiterminal element route
Protect the problem in terms of definite value；The movement fitting method constructs multi-terminal direct current transmission system, based on above-mentioned multiterminal element
Route protection definite value method carries out definite value to the system constructed and converting plant receives line protective devices and issues line fault
After reset command, the specific method cooperated jointly with corresponding converter station bus rod differential protection, pole protection, route protection,
Problem of the multiterminal element route protection in terms of adjusting is able to solve using the above method, guarantees equipment and personal safety, is improved
The operational reliability of multi-terminal direct current transmission system has stronger operability.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of multi-terminal direct current transmission system provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of multi-terminal direct current transmission system converter station provided in an embodiment of the present invention；
Fig. 3 A-3C is a kind of the first route protection definite value of multi-terminal direct current transmission system provided in an embodiment of the present invention
Schematic diagram；
Fig. 4 A-4B is a kind of second of route protection definite value of multi-terminal direct current transmission system provided in an embodiment of the present invention
Schematic diagram；
Fig. 5 is a kind of movement fitting method flow chart of multiterminal element protection provided in an embodiment of the present invention.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description.
The embodiment of the present invention provides a kind of movement fitting method of multiterminal element route protection, including building multiterminal element is defeated
Electric system carries out definite value to the system constructed based on determining multiterminal element route protection definite value method and when in system
Converting plant carries out corresponding operating after being connected to protection signal.
A kind of multi-terminal direct current transmission system, the system include M converting plant and N number of Inverter Station, wherein M and N is to be greater than
Or the integer equal to 1, M+N are the integer more than or equal to 3, different DC lines are connected to bus rod, the bus rod
In some Converter Station.The structural schematic diagram of specific system is equal to 2 as shown in Figure 1, M is equal to 1, N, and system includes rectification
Stand A, Inverter Station B and Inverter Station C, which includes DC line 1, the Inverter Station B of converting plant A connection Inverter Station B
The DC line 2, DC line 1 and DC line 2 for connecting Inverter Station C are all connected to bus rod.Every route passes through flat wave
Reactor is connected with converter valve.Bus rod is located in the station Inverter Station B.Fault point F1 is located at route 1, and fault point F2 is located at route
2, fault point 3 is located at bus rod, and fault point 4 is located in the station Inverter Station B at high direct voltage bus.
The structural schematic diagram of multi-terminal direct current transmission system converter station is as shown in Fig. 2, converting plant A, Inverter Station B and Inverter Station C
Each converter station includes three device, line protective devices and electrode protector devices of pole control, the pole control of different converter stations
Device establishes communication connection between any two, and the line protective devices of different converter stations establish communication connection between any two；It is same to change
Communication connection is mutually established between electrode protector, line protective devices and pole control device in standing in stream station.
A kind of valued methods of multiterminal element route protection, including both ends operation valued methods and multiterminal run definite value side
Method, in which: it includes our station DC line electric current measuring point to flat wave electricity of standing that both ends, which run valued methods as DC line protection area,
DC line and all devices between anti-device, fixed value adjusting principle be adjacent converter station smoothing reactor valve side error protection not
Movement；Multiterminal operation valued methods are the DC line protection retained under the method for operation of adjacent converter station both ends, are exited non-adjacent
DC line protection under the method for operation of converter station both ends；Increase by one section of traveling-wave protection in converting plant, protection scope can be into one
Step extends to next route, and fixed value adjusting principle is that the protection of adjacent converter station AC fault is failure to actuate.
The schematic diagram of the first route protection definite value of multi-terminal direct current transmission system is as shown in figure 3, Fig. 3 A is converting plant A's
Route protection range, Fig. 3 B are the route protection range of Inverter Station B, and Fig. 3 C is the route protection range of Inverter Station C.
As shown in Figure 3A, the protection scope of converting plant A route protection is from our station line current measuring point IdL_A to Inverter Station B
Smoothing reactor, fixed value adjusting is motionless as basic principle using Inverter Station B smoothing reactor valve side earth fault, adds traveling wave and protects
The protection scope of shield extends to route 2 from from our station line current measuring point IdL_A, and fixed value adjusting is with Inverter Station C smoothing reactor
The protection of valve side earth fault is failure to actuate and the protection of Inverter Station B AC fault is motionless as basic principle.
As shown in Figure 3B, Inverter Station B configures 2 sets of route protections and bus rod differential protection, the protection of first set route
Range is from our station line current measuring point IdL_B1 to converting plant A smoothing reactor, and fixed value adjusting is with converting plant A smoothing reactor valve
It is motionless as basic principle to flank earth fault；The protection scope of second set of protection circuit from our station line current measuring point IdL_B2 to
Inverter Station C smoothing reactor, fixed value adjusting are motionless as basic principle using Inverter Station C smoothing reactor valve side earth fault；It converges
Flow bus rod of the protection scope of bus differential protecting between DC line electric current measuring point IdL_B1, IdL_B2 and IdL_B
And associated wiring.
As shown in Figure 3 C, the protection scope of Inverter Station C route protection is from our station line current measuring point IdL_C to Inverter Station B
Smoothing reactor, fixed value adjusting are motionless as basic principle using Inverter Station B smoothing reactor valve side earth fault.
The schematic diagram of second of route protection definite value of multi-terminal direct current transmission system is as shown in figure 4, Inverter Station B exits fortune
Row, but bus rod does not exit；Fig. 4 A is the route protection range of converting plant A after Inverter Station B is out of service；Fig. 4 B is inversion
After the B that stands is out of service, the route protection range of Inverter Station C.
As shown in Figure 4 A, the protection scope of converting plant A route protection is switched to from our station line current measuring point IdL_A to inverse
Become station C smoothing reactor, fixed value adjusting is motionless as basic principle using Inverter Station C smoothing reactor valve side earth fault, adds
Traveling-wave protection is exited；As shown in Figure 4 B, the protection scope of Inverter Station C route protection is switched to from our station line current measuring point IdL_
For C to converting plant A smoothing reactor, fixed value adjusting is motionless as basic principle using converting plant A smoothing reactor valve side earth fault；
Since still access system, Inverter Station B line protective devices do not exit bus rod, pole protection, pole control device can be exited；It is inverse
Become station B bus rod differential protection protection scope and is switched to the mother of the confluence between DC line electric current measuring point IdL_B1, IdL_B2
Line and associated wiring；2 sets of route protections of Inverter Station B are also still put into, and the protection scope of first set protection circuit is from our station
Line current measuring point IdL_B1 is to converting plant A smoothing reactor, and fixed value adjusting is with converting plant A smoothing reactor valve side earth fault
Motionless to be used as basic principle, the protection scope of second set of protection circuit is put down from our station line current measuring point IdL_B2 to Inverter Station C
Wave reactor, fixed value adjusting are motionless as basic principle using Inverter Station C smoothing reactor valve side earth fault.
A kind of movement fitting method of multiterminal element route protection, the specific operation method is as follows:
When converting plant is connected to the line fault reset command of our station or other streamline line protection devices transmission of standing erectly, then basis
The converter valve of line fault reset command control converting plant forces phase shift；
During converting plant phase shift, if receiving bus rod differential protection action signal, pole emergency outage is issued
Order, all converter stations execute pole and stop transport；
During converting plant phase shift, if receiving other converter station pole protection signals, when failure converter station is system
Uniquely in fortune converting plant or uniquely in fortune Inverter Station, then pole locking order is executed；If failure converter station is not uniquely whole in fortune
Stream station is not uniquely then to execute isolated fault converter station reset command again in fortune Inverter Station；
During converting plant phase shift, if not receiving the signal of other converter station poles protection and bus rod protection act,
Waiting was gone after the free time, is restarted strategy execution valve by line fault and is restarted order and subsequent operation.
It is protected below with reference to the structural schematic diagram of the multi-terminal direct current transmission system of Fig. 1 and multiterminal element shown in fig. 5 dynamic
Make fitting method flow chart, illustrates concrete operations process.
After ground fault F1 occurs for route 1, converting plant A route protection movement, movement outlet is that line fault restarts life
It enables, is transferred to the pole converting plant A control device；Device is controlled in the pole converting plant A forces phase shift according to the converter valve that the order executes converting plant；
During converting plant A phase shift, the action signal of Inverter Station B first set route protection will be received, but have no bus rod differential protection
With pole protection signal, therefore wait and going after the free time, by line fault restart strategy execution restart order and after
Continuous operation.
After ground fault F2 occurs for route 2, converting plant A adds second set of route of traveling wave protection act or Inverter Station B
Road protection act reaches converting plant A route protection through interior communication, and route protection movement outlet is line fault reset command, passes
Device is controlled to the pole converting plant A；Device is controlled in the pole converting plant A forces phase shift according to the converter valve that the order executes converting plant；Converting plant A
During phase shift, bus rod differential protection and pole protection signal are had no, therefore waits and going after the free time, by route event
Barrier restarts strategy execution and restarts order and subsequent operation.
After ground fault F3 occurs for bus rod, converting plant A route protection movement, movement outlet is restarted for line fault
Order is transferred to the pole converting plant A control device；Device is controlled in the pole converting plant A to be forced to move according to the converter valve that the order executes converting plant
Phase；During converting plant A phase shift, the action signal of Inverter Station B bus rod differential protection will be received, issue the life of pole emergency outage
It enables, all converter stations execute pole and stop transport.
After Inverter Station B stands interior high direct voltage bus generation ground fault F4, converting plant A route protection or additional traveling wave are protected
Shield may act, and protection act outlet is line fault reset command, be transmitted to the pole converting plant A control device；Control device in the pole converting plant A
Phase shift is forced according to the converter valve that the order executes converting plant；During converting plant A phase shift, Inverter Station B pole protection act letter is received
Number, since Inverter Station B is not to execute reset command again executing isolated fault converter station uniquely in fortune Inverter Station.
The definite value and operating method of a kind of multiterminal element route protection provided by the invention, valued methods describe both ends and
Route protection range and setting principle under multiterminal operating condition, the valued methods are able to solve multiterminal element route protection fixed
It is worth the problem of aspect；The operating method constructs multi-terminal direct current transmission system, based on above-mentioned multiterminal element route protection definite value
After method receives line protective devices sending line fault reset command to the system progress definite value and converting plant that have constructed, with
The specific method that corresponding converter station bus rod differential protection, pole protection, route protection cooperate jointly, using above method energy
Enough solve the problems, such as that multiterminal element route protection in terms of adjusting, guarantees equipment and personal safety, improves multi-terminal HVDC transmission
The operational reliability of system has stronger operability.
Although the present invention is disclosed above in the preferred embodiment, it is not intended to limit the invention the range of implementation.Any
The those of ordinary skill in field is not departing from invention scope of the invention, improves when can make a little, i.e., all according to this hair
Bright done same improvement, should be the scope of the present invention and is covered.
Claims (4)
1. a kind of fixed value adjusting method of multiterminal element route protection, which is characterized in that run fixed value adjusting method including both ends
Fixed value adjusting method is run with multiterminal, in which:
Multiterminal operation fixed value adjusting method is the DC line protection retained under the method for operation of adjacent converter station both ends, exits non-phase
DC line protection under the method for operation of adjacent converter station both ends；Increase by one section of traveling-wave protection in converting plant, protection scope can be into
One step extends to next route, and fixed value adjusting principle is that the protection of adjacent converter station AC fault is failure to actuate.
2. a kind of movement fitting method of multiterminal element route protection characterized by comprising building multi-terminal HVDC transmission system
It unites, is carried out by definite value and is worked as the system constructed based on multiterminal element route protection definite value method described in claim 1 and be
Converting plant in system carries out corresponding operating after being connected to protection signal, and the specific operation method is as follows:
When converting plant is connected to the line fault reset command of our station or other streamline line protection device transmission of standing erectly, then according to
The converter valve that line fault reset command controls converting plant forces phase shift；
During converting plant phase shift, if receiving bus rod differential protection action signal, the order of pole emergency outage is issued,
All converter stations execute pole and stop transport；
During converting plant phase shift, if receiving other converter station pole protection signals, when failure converter station is that system is unique
In fortune converting plant or uniquely in fortune Inverter Station, then pole locking order is executed；If failure converter station is not uniquely in fortune converting plant
It or is not uniquely then to execute isolated fault converter station reset command again in fortune Inverter Station；
During converting plant phase shift, if not receiving the signal of other converter station poles protection and bus rod protection act, wait
It goes after the free time, restarts strategy execution valve by line fault and restart order and subsequent operation.
3. the movement fitting method of multiterminal element route protection as claimed in claim 2, which is characterized in that the multiterminal element
Transmission system includes: M converting plant and N number of Inverter Station, wherein M and N is the integer more than or equal to 1, M+N be greater than or
Integer equal to 3, different DC lines are connected to bus rod, and the bus rod is located in some Converter Station.
4. the movement fitting method of multiterminal element route protection as claimed in claim 2, which is characterized in that the converter station packet
Pole control device, line protective devices and electrode protector are included, the pole control device of different converter stations establishes communication connection between any two,
The line protective devices of different converter stations establish communication connection between any two；Electrode protector, route are protected in same Converter Station
Communication connection is mutually established between protection unit and pole control device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810952698.5A CN109038518B (en) | 2018-08-20 | 2018-08-20 | Fixed value setting and action matching method for multi-terminal direct-current line protection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810952698.5A CN109038518B (en) | 2018-08-20 | 2018-08-20 | Fixed value setting and action matching method for multi-terminal direct-current line protection |
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| Publication Number | Publication Date |
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| CN109038518A true CN109038518A (en) | 2018-12-18 |
| CN109038518B CN109038518B (en) | 2020-08-14 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110556802A (en) * | 2019-09-25 | 2019-12-10 | 南京南瑞继保电气有限公司 | Converter fault protection method for multi-converter direct-current transmission system |
| CN110783902A (en) * | 2019-10-22 | 2020-02-11 | 南方电网科学研究院有限责任公司 | Line fault detection method, device and medium for multi-terminal direct current transmission system |
| CN111200278A (en) * | 2020-02-24 | 2020-05-26 | 中国南方电网有限责任公司超高压输电公司昆明局 | High-speed grounding switch anti-tripping protection method in direct-current system metal loop operation mode |
| CN112448373A (en) * | 2020-10-30 | 2021-03-05 | 中国南方电网有限责任公司超高压输电公司 | Method for realizing metal transverse error protection of parallel multi-terminal direct-current transmission system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108376976A (en) * | 2018-03-23 | 2018-08-07 | 南方电网科学研究院有限责任公司 | The direct current protecting definite value of multi-terminal direct current transmission system switching method and device in short-term |
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2018
- 2018-08-20 CN CN201810952698.5A patent/CN109038518B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108376976A (en) * | 2018-03-23 | 2018-08-07 | 南方电网科学研究院有限责任公司 | The direct current protecting definite value of multi-terminal direct current transmission system switching method and device in short-term |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110556802A (en) * | 2019-09-25 | 2019-12-10 | 南京南瑞继保电气有限公司 | Converter fault protection method for multi-converter direct-current transmission system |
| CN110783902A (en) * | 2019-10-22 | 2020-02-11 | 南方电网科学研究院有限责任公司 | Line fault detection method, device and medium for multi-terminal direct current transmission system |
| CN110783902B (en) * | 2019-10-22 | 2021-07-30 | 南方电网科学研究院有限责任公司 | Line fault detection method, device and medium for multi-terminal direct current transmission system |
| CN111200278A (en) * | 2020-02-24 | 2020-05-26 | 中国南方电网有限责任公司超高压输电公司昆明局 | High-speed grounding switch anti-tripping protection method in direct-current system metal loop operation mode |
| CN112448373A (en) * | 2020-10-30 | 2021-03-05 | 中国南方电网有限责任公司超高压输电公司 | Method for realizing metal transverse error protection of parallel multi-terminal direct-current transmission system |
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| Publication number | Publication date |
|---|---|
| CN109038518B (en) | 2020-08-14 |
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