CN109142923A - Improved method for DC field debugging second-level overload test - Google Patents
Improved method for DC field debugging second-level overload test Download PDFInfo
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- CN109142923A CN109142923A CN201810957819.5A CN201810957819A CN109142923A CN 109142923 A CN109142923 A CN 109142923A CN 201810957819 A CN201810957819 A CN 201810957819A CN 109142923 A CN109142923 A CN 109142923A
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000005404 monopole Effects 0.000 claims description 10
- 230000000903 blocking effect Effects 0.000 claims description 5
- 238000011084 recovery Methods 0.000 abstract description 4
- 230000002349 favourable effect Effects 0.000 abstract 1
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- General Physics & Mathematics (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses an improved method for a direct current field debugging second-level overload test, which comprises the following steps: the rectification station and the inversion station are matched to unlock in a bipolar ground return line mode; raising the direct current bipolar power to 1.4 times of the rated level of a single pole; one pole control protection system on the rectifier station side locks the corresponding pole through direct-current low-voltage protection; observing whether the power of the other pole at the rectifier station side is increased to 1.4 times of the rated power of a single pole from the power before the first pole is locked or not through field wave recording, and if the power is maintained for about 3 seconds; and controlling protection of the first pole at the reduction rectification side, quickly unlocking the first pole, and observing bipolar balance operation of the direct current debugging system until the ground current is 0. The method can ensure that the test is carried out smoothly, and reduce the impact on a power grid system; the system is also favorable for quick recovery of system operation after the test, and avoids the influence of long-time ground current.
Description
Technical field
The present invention relates to electric system DC engineering debugging technique field more particularly to a kind of DC field debugging second grade mistakes
The improved method of load test.
Background technique
Overload trial in DC engineering field adjustable, including continuous overload and Short term overload, middle or short term mistake
Load includes second grade overload, and second grade overload refers to that within a certain period of time usual 3 seconds, DC current was higher than its rated current
Ability.
In existing second grade overload trial, usually carries out under DC bipolar operation, run when direct current in specified mode
In the case of, monopolar ground circuit operation mode is switched to by pole of quickly stopping transport, realizes power from stoppage in transit pole to operating normally pole
Transfer, to reach the ability for operating normally pole second grade overload.Such as the specified debugging system of 5000MW, pole of stopping transport, example
As the power of pole 1, pole 2 can reach the overload ability of supplying electric power of 1.4 times of i.e. 3500MW of the specified 2500MW of monopole in second grade.At present
Debud mode is big to network system power rush, and the monopolar ground circuit operation mode time is long.
Summary of the invention
For problem of the prior art, the object of the present invention is to provide a kind of DC field debugging second grade overload trials
Improved method, this method can both be gone on smoothly with guarantee test, reduced and impacted to network system；System is transported after being also beneficial to test
Capable fast quick-recovery avoids prolonged earth current from influencing.
To achieve the above object, a kind of improved method of DC field debugging second grade overload trial of the present invention, debugging system
System includes converting plant and Inverter Station, and converting plant and Inverter Station have pole 1 and the pole of pole 2 two and pole to be grounded, each pole connection pair
The pole Control protection system answered connects forming circuit between converting plant and the pole of Inverter Station, which is characterized in that improved method step
Suddenly include:
Converting plant and the cooperation of two station of Inverter Station unlock under bipolar Ground return mode；
DC bipolar power is risen to 1.4 times of monopole nominal；
The one of pole Control protection system in converting plant side corresponds to pole by DC low-voltage protection blocking；
By live recording, whether the power of another pole of converting plant side is observed by first extremely preceding power liter of locking
To 1.4 times of monopole rated power, if being to maintain about 3 seconds；
The first pole control protection of involution rectification side, unlocks rapidly first pole, observes the bipolar balance of direct current debugging system
Operation, until earth current is 0.
Preferably, the monopole is rated for 2500MW, and 1.4 times are 3500MW.
Preferably, the DC low-voltage protection is that 27DC DC low-voltage is protected.
Implement the present invention can be achieved it is following the utility model has the advantages that converting plant side be latched one of them extremely before by DC bipolar power very
To 1.4 times of monopole power, it is then latched first pole debugging test, had both reached debugging purpose in this way and has decreased to power grid
The impact of system；The fast quick-recovery of debugging system operation can be realized using low-voltage direct-current protection blocking mode.
Detailed description of the invention
Fig. 1 is a kind of structural representation of DC field debugging second grade overload trial system provided in an embodiment of the present invention
Figure；
Fig. 2 is a kind of process of DC field debugging second grade overload trial improved method provided in an embodiment of the present invention
Figure.
Specific embodiment
There is provided below with reference to the present invention is attached drawing, is further described to the method for the present invention.
DC field debugs the structural schematic diagram of second grade overload trial system as shown in Figure 1, debugging system includes rectification
It stands and Inverter Station, converting plant and Inverter Station has pole 1 and the pole of pole 2 two and pole to be grounded, each pole connects corresponding pole control
Forming circuit is connected between the pole of protection system, converting plant and Inverter Station.
Bipolar power rated value is set in embodiment as 5000MW, monopole is rated for 2500MW, 1.4 times of second grade overload lists
Pole power is 3500MW.
DC field debugs the flow chart of second grade overload trial improved method as shown in Fig. 2, specific implementation step is as follows:
S1. converting plant and the cooperation of two station of Inverter Station unlock under bipolar Ground return mode.
S2., DC bipolar power is risen to 1.4 times of monopole nominal, i.e. 3500MW.
S3. the one of pole Control protection system in converting plant side corresponds to pole by DC low-voltage protection blocking；Rectification side is logical
DC minimum voltage protection (27DC) locking pole 1 is crossed, forces phase shift to be delayed it through Millisecond to 120 ° trigger pulse immediately after
Afterwards, Trigger Angle is set to 160 °, and then trigger pulse is latched, and stops sending trigger pulse to converter valve；Rectification side is simultaneously to inverse
Become side and issue locking request, the delay that inverter side communicates between being missed the stop is followed by locking order and executes locking sequence: DC current
500 milliseconds of delay after less than 3%, Trigger Angle is set to 160 °, and controller exits, and trigger pulse locking stops sending out to converter valve
Send pulse.
S4. by live recording, whether the power of another pole of converting plant side is observed by first extremely preceding function of locking
1.4 times of excess loads that rate 1750MW rises to monopole rated power say flat, i.e. 3500MW, if being to maintain about 3 seconds；
S5. first pole control protection of involution rectification side, unlocks rapidly first pole, and observation direct current debugging system is bipolar flat
Weighing apparatus operation, until earth current is 0.
Implement the present invention can be achieved it is following the utility model has the advantages that converting plant side be latched one of them extremely before by DC bipolar power very
To 1.4 times of monopole power, it is then latched first pole debugging test, had both reached debugging purpose in this way and has decreased to power grid
The impact of system；The fast quick-recovery of debugging system operation can be realized using low-voltage direct-current protection blocking mode.
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 (3)
1. a kind of improved method of DC field debugging second grade overload trial, debugging system includes converting plant and Inverter Station, whole
Stream station and Inverter Station have pole 1 and the pole of pole 2 two and pole to be grounded, and each pole connects corresponding pole Control protection system, rectify
It stands and connects forming circuit between the pole of Inverter Station, which is characterized in that the improved method step includes:
Converting plant and the cooperation of two station of Inverter Station unlock under bipolar Ground return mode；
DC bipolar power is risen to 1.4 times of monopole nominal；
The one of pole Control protection system in converting plant side corresponds to pole by DC low-voltage protection blocking；
By live recording, whether the power for observing another pole of converting plant side by the power before locking first extremely rises to list
1.4 times of pole rated power, if being to maintain about 3 seconds；
The first pole control protection of involution rectification side, unlocks rapidly first pole, observes the bipolar balance movement of direct current debugging system,
Until earth current is 0.
2. the improved method of DC field debugging second grade overload trial as described in claim 1, which is characterized in that the list
Pole is rated for 2500MW, and 1.4 times are 3500MW.
3. the improved method of DC field debugging second grade overload trial as claimed in claim 2, which is characterized in that described straight
Low-voltage variation is flowed for the protection of 27DC DC low-voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810957819.5A CN109142923B (en) | 2018-08-21 | 2018-08-21 | Improved method for DC field debugging second-level overload test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810957819.5A CN109142923B (en) | 2018-08-21 | 2018-08-21 | Improved method for DC field debugging second-level overload test |
Publications (2)
| Publication Number | Publication Date |
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| CN109142923A true CN109142923A (en) | 2019-01-04 |
| CN109142923B CN109142923B (en) | 2021-07-20 |
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| CN201810957819.5A Active CN109142923B (en) | 2018-08-21 | 2018-08-21 | Improved method for DC field debugging second-level overload test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146781A (en) * | 2019-05-07 | 2019-08-20 | 南方电网科学研究院有限责任公司 | Improved method for DC field debugging instant communication loss test |
| CN113300336A (en) * | 2021-04-18 | 2021-08-24 | 广西大学 | Novel high-voltage direct-current transmission line protection method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110146781A (en) * | 2019-05-07 | 2019-08-20 | 南方电网科学研究院有限责任公司 | Improved method for DC field debugging instant communication loss test |
| CN110146781B (en) * | 2019-05-07 | 2021-07-30 | 南方电网科学研究院有限责任公司 | Improved method for DC field debugging instant communication loss test |
| CN113300336A (en) * | 2021-04-18 | 2021-08-24 | 广西大学 | Novel high-voltage direct-current transmission line protection method |
| CN113300336B (en) * | 2021-04-18 | 2022-05-13 | 广西大学 | Novel high-voltage direct-current transmission line protection method |
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