CN110912172B - Online input method and system for converter station of multi-terminal direct-current transmission system - Google Patents
Online input method and system for converter station of multi-terminal direct-current transmission system Download PDFInfo
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- CN110912172B CN110912172B CN201911102777.8A CN201911102777A CN110912172B CN 110912172 B CN110912172 B CN 110912172B CN 201911102777 A CN201911102777 A CN 201911102777A CN 110912172 B CN110912172 B CN 110912172B
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- converter station
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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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- 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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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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]
-
- 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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The invention relates to a method and a system for online putting in a converter station of a multi-terminal direct-current transmission system, which comprises the following steps: confirming that a line to be put into the converter station is in a cold standby state; performing phase shift control on the rectifying side of the operating system, and simultaneously switching a converter station to be put into a current control mode; waiting for the pressure difference between two ends of a switch to be put into the converter station to be smaller than a threshold value; the converter station to be put into the system is closed; controlling the converter station to be put into operation to execute line connection sequential control operation; after receiving the returned state information, restarting the system to complete the online putting of the convertor station into the running system; the state information is information that the line to be put into the converter station reaches a connection state. The invention can ensure that the converter station is stably put into the multi-terminal direct-current transmission system, has smaller impact in the putting-in process and meets the flexible operation of the direct-current transmission system.
Description
Technical Field
The invention relates to an online putting-in method and system for a converter station of a multi-terminal direct-current transmission system, and belongs to the technical field of direct-current transmission.
Background
The multi-terminal direct-current transmission system is a direct-current transmission system formed by three or more converter stations in a certain connection mode, multipoint power supply and multipoint power receiving can be achieved, when one converter station is put into operation on line, the multi-terminal direct-current transmission system cannot be started up after being stopped like a direct-current transmission system at two ends. The system can not be stopped for a long time in the process of being put into the converter station, and the system has the advantages of direct current transmission at two ends and unique advantages of multiple ends.
Based on the characteristics of a multi-terminal direct-current transmission system, the primary equipment is limited, and the primary equipment is prevented from being impacted greatly in the input process. The control strategy of the converter station investment of the multi-terminal direct current transmission system is different from the control strategy of the shutdown investment of the conventional direct current transmission system, and special treatment is needed.
Disclosure of Invention
The invention provides a method and a system for online putting in of a converter station of a multi-terminal direct-current transmission system, which realize the function of online putting in of the converter station, can ensure that the converter station is stably put in the multi-terminal direct-current transmission system, has small impact in the putting-in process, and meets the flexible operation of the direct-current transmission system.
In order to achieve the above purpose, the scheme of the invention comprises:
the invention discloses an online input method of a converter station of a multi-terminal direct-current transmission system, which comprises the following steps of:
1) Confirming that a line to be put into the converter station is in a cold standby state;
2) Performing phase shift control on a rectifying side of an operating system, and switching a converter station to be put into a current control mode;
3) Waiting for the pressure difference between two ends of a switch to be put into the converter station to be smaller than a threshold value; the converter station to be put into the system is closed;
4) Controlling the converter station to be put into operation to execute line connection sequence control operation; after the returned state information is received, restarting the system to complete the online putting of the convertor station into the running system; the state information is information that the line to be put into the converter station reaches a connection state.
The invention also provides an online putting system of the converter station of the multi-terminal direct current transmission system, which comprises a controller and a memory, wherein the controller executes the instruction stored in the memory so as to realize the steps of the online putting method of the converter station of the multi-terminal direct current transmission system.
The method and the system can judge the state and the control mode of the line put into the convertor station, further execute the phase shift of the operating system and the line connection sequential control of the line put into the convertor station, and finally realize the online putting into of the convertor station after the system is restarted successfully. The invention can ensure that the converter station is stably put into the multi-terminal direct-current transmission system, has smaller impact in the putting-in process and meets the flexible operation of the direct-current transmission system.
Further, as a further improvement of the method and the system, in the step 1), if the line to be put into the converter station is not in a cold standby state, the information of the fault of the converter station to be put into the converter station is fed back.
Before the converter station is put into operation, the line of the converter station is manually or automatically placed in a cold standby state, after a converter station input instruction is received, the state of the line to be put into the converter station is detected, if the line is not in the cold standby state, the converter station is abnormal, the converter station is stopped to be put into operation, and the safety and stability of a direct current transmission system are guaranteed.
Further, as a further improvement of the method and the system, in the step 3), the adjustment time is monitored, and if the adjustment time is greater than a set value, the converter station to be put into is stopped, and meanwhile, information of the fault of the converter station to be put into is fed back; the adjustment time is as follows: from the start of the phase shift control to the time when the pressure difference across the switch to be put into the converter station decreases to said threshold value.
The direct-current voltage is reduced by phase-shifting control on the rectifying side of the direct-current transmission system, if the voltage difference between two ends of a switch of the converter station cannot be reduced to a threshold value for a long time, the direct-current voltage cannot be effectively reduced, and then the converter station is put into or the direct-current transmission system is abnormal, the converter station is stopped from being put into, the safety and the stability of the direct-current transmission system are guaranteed, and accidents are prevented.
Further, as a further improvement of the method and the system, in the step 4), status information returned by the line to be put into the converter station is monitored, and if the return time of the status information is greater than a set value, the putting into the converter station is stopped, and a fault of the converter station to be put into is fed back; the state information is information that the line to be put into the converter station reaches a connection state.
And the time for the converter station to be put into the connection state after the line connection sequence control is over indicates that the converter station is put into the abnormal state, and the putting is stopped in time at the moment, so that the safety and the stability of the direct-current transmission system are ensured, and accidents are prevented.
Drawings
Fig. 1 is a schematic diagram of a multi-terminal dc transmission system;
fig. 2 is a flow chart of an online commissioning method of a converter station of a multi-terminal direct current transmission system according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The method comprises the following steps:
the basic structure of the multi-terminal direct-current transmission system is shown in fig. 1, the multi-terminal direct-current transmission system at least comprises three-terminal flexible direct-current poles, each terminal pole adopts a bipolar structure, each pole has control modes of direct-current voltage, direct current and the like, each pole also has control modes of bipolar power, unipolar power and unipolar current, and each converter station is connected with other converter stations through direct-current lines.
In this embodiment, the present invention will be described by taking the basic structure of the multi-terminal dc power transmission system shown in fig. 1 as an example. In the figure, a station a, a station B and a station C are included, wherein the station a is a sending end converter station, the station B and the station C are receiving end converter stations, and when the station C is not operated, the station B is in a voltage control mode; and when the station C is put into operation, the station C is in a voltage control mode, and the initial working condition is that the station A and the station B operate in a steady state.
As shown in fig. 2, a flow chart of an online putting-in method of a converter station of a multi-terminal dc transmission system according to the present invention is shown, in this embodiment, the method of the present invention is specifically described by taking the putting-in of the station C pole 1 as an example. The line to which the station C pole 1 is connected is first manually or automatically operated to a cold standby state and then the station C pole 1 is set in command. And after receiving the input command, confirming whether the C pole 1 line of the station is in a cold standby state, and if so, continuing to perform the next step. As another embodiment, if the station C pole 1 line is not in the cold standby state, a fault of the station C to be put into the station is fed back, and the putting into the station is stopped at the same time.
And (3) phase shifting control is carried out on the rectifying side of the operating system, so that the direct-current voltage and the direct current of the system are reduced, and the direct-current voltage and the direct current are waited to be reduced to a certain level. Since the station C is in the voltage control mode, the control mode of the voltage station in the operating system is switched, that is, the control mode of the station B is switched to the current control mode in this embodiment.
And detecting the pressure difference at two ends of a closed switch of the station C to be put into the station, stopping phase shifting after the pressure difference meets a set value, simultaneously issuing a C pole 1 line connection command of the station, executing line connection sequential control, and continuously monitoring the state of the line.
As another embodiment, the time for which the differential pressure across the closed switch of the station C to be put into the station falls to the set value is monitored, and if the time is longer than the set time, it is considered that the station C is abnormally operated, and a failure is fed back and the putting of the station C is stopped.
If the line connection state returns within the set time, executing three-station restarting control, and further completing online input of the converter station; and if the line connection state is not returned within the set time, the feedback station C is put into a fault, the putting is stopped, and the restarting control of the station A and the station B is executed at the same time, so that the system operation is recovered.
Each set time should be determined according to the normal working conditions of the direct current transmission system and the corresponding station.
The embodiment of the system is as follows:
the online putting system of the converter station of the multi-terminal direct-current transmission system comprises a controller and a memory, wherein the controller executes instructions stored in the memory to realize the online putting method of the converter station of the multi-terminal direct-current transmission system.
Claims (8)
1. An online putting method of a converter station of a multi-terminal direct current transmission system is characterized by comprising the following steps:
1) Confirming that a line to be put into the converter station is in a cold standby state;
2) Performing phase shift control on the rectifying side of the operating system, and simultaneously switching a converter station to be put into a current control mode;
3) Waiting for the pressure difference between two ends of a switch to be put into the converter station to be smaller than a threshold value; the switch to be put into the converter station is a switch which enables the converter station to be put into the system when the switch to be put into the converter station is closed;
4) Controlling the converter station to be put into operation to execute line connection sequential control operation; after receiving the returned state information, restarting the system to complete the online putting of the convertor station into the running system; the state information is information that the line to be put into the converter station reaches a connection state.
2. The online putting method for the converter station of the multi-terminal direct current transmission system according to claim 1, wherein in the step 1), if the line to be put into the converter station is not in a cold standby state, information of a fault of the converter station to be put into the converter station is fed back.
3. The method according to claim 1 or 2, wherein in step 3), the adjustment time is monitored, and if the adjustment time is greater than a set value, the input of the converter station to be input is stopped, and the input fault information of the converter station to be input is fed back; the adjustment time is as follows: the time from the start of the phase shift control to the reduction of the pressure difference across the switch of the converter station to be put into the threshold value.
4. The online putting method of the converter station of the multi-terminal direct current transmission system according to claim 3, wherein in the step 4), status information returned by a line of the converter station to be put is monitored, and if the return time of the status information is longer than a set value, putting of the converter station to be put is stopped, and meanwhile, a fault of the converter station to be put is fed back; the state information is information that the line to be put into the converter station reaches a connection state.
5. An on-line commissioning system for a multi-terminal dc transmission system converter station comprising a controller and a memory, the controller executing instructions stored in the memory to perform the steps of:
1) Confirming that a line to be put into the converter station is in a cold standby state;
2) Performing phase shift control on a rectifying side of an operating system, and switching a converter station to be put into a current control mode;
3) Waiting for the pressure difference between two ends of a switch to be put into the converter station to be smaller than a threshold value; the switch to be put into the converter station is a switch which enables the converter station to be put into the system when the switch to be put into the converter station is closed;
4) Controlling the converter station to be put into operation to execute line connection sequential control operation; after the returned state information is received, restarting the system to complete the online putting of the convertor station into the running system; the state information is information that the line to be put into the converter station reaches a connection state.
6. The on-line putting system for the converter station of the multi-terminal direct current transmission system according to claim 5, wherein in the step 1), if the line to be put into the converter station is not in a cold standby state, the information of the fault to be put into the converter station is fed back.
7. The multi-terminal direct current transmission system converter station online putting system according to claim 5 or 6, wherein in the step 3), the adjustment time is monitored, and if the adjustment time is greater than a set value, putting of the converter station to be put is stopped, and meanwhile information of putting faults of the converter station to be put is fed back; the adjustment time is as follows: from the start of the phase shift control to the time when the pressure difference across the switch to be put into the converter station decreases to said threshold value.
8. The on-line putting system of the converter station of the multi-terminal direct current transmission system according to claim 7, wherein in the step 4), status information returned by the line to be put into the converter station is monitored, and if the return time of the status information is greater than a set value, putting into the converter station to be put is stopped, and meanwhile, a fault of the converter station to be put into is fed back; the state information is information that the line to be put into the converter station reaches a connection state.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911102777.8A CN110912172B (en) | 2019-11-12 | 2019-11-12 | Online input method and system for converter station of multi-terminal direct-current transmission system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911102777.8A CN110912172B (en) | 2019-11-12 | 2019-11-12 | Online input method and system for converter station of multi-terminal direct-current transmission system |
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| CN110912172A CN110912172A (en) | 2020-03-24 |
| CN110912172B true CN110912172B (en) | 2023-02-14 |
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| CN201911102777.8A Active CN110912172B (en) | 2019-11-12 | 2019-11-12 | Online input method and system for converter station of multi-terminal direct-current transmission system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114400696B (en) * | 2022-01-28 | 2023-06-20 | 广东电网有限责任公司广州供电局 | Sequential control method and system of back-to-back direct current transmission system |
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| JPS5941178A (en) * | 1982-09-01 | 1984-03-07 | Tokyo Electric Power Co Inc:The | Controller for dc multiterminal system |
| CN103296692A (en) * | 2013-06-21 | 2013-09-11 | 国家电网公司 | Control device and method for putting converter station into flexible direct current power transmission system |
| CN106058907A (en) * | 2016-06-30 | 2016-10-26 | 国网浙江省电力公司电力科学研究院 | Method of inputting line into DC network in multi-end flexible DC power transmission system |
| CN106549408A (en) * | 2016-10-11 | 2017-03-29 | 许继集团有限公司 | A kind of multiterminal HVDC transmission system inverter puts into method online |
| CN108400610A (en) * | 2018-03-23 | 2018-08-14 | 南方电网科学研究院有限责任公司 | The current conversion station of Multi-end flexible direct current transmission system puts into method and apparatus online |
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2019
- 2019-11-12 CN CN201911102777.8A patent/CN110912172B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5941178A (en) * | 1982-09-01 | 1984-03-07 | Tokyo Electric Power Co Inc:The | Controller for dc multiterminal system |
| CN103296692A (en) * | 2013-06-21 | 2013-09-11 | 国家电网公司 | Control device and method for putting converter station into flexible direct current power transmission system |
| CN106058907A (en) * | 2016-06-30 | 2016-10-26 | 国网浙江省电力公司电力科学研究院 | Method of inputting line into DC network in multi-end flexible DC power transmission system |
| CN106549408A (en) * | 2016-10-11 | 2017-03-29 | 许继集团有限公司 | A kind of multiterminal HVDC transmission system inverter puts into method online |
| CN108400610A (en) * | 2018-03-23 | 2018-08-14 | 南方电网科学研究院有限责任公司 | The current conversion station of Multi-end flexible direct current transmission system puts into method and apparatus online |
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