CN110854826B - Fault diagnosis and processing method for two-out-of-three protection system of flexible direct converter valve - Google Patents
Fault diagnosis and processing method for two-out-of-three protection system of flexible direct converter valve Download PDFInfo
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- CN110854826B CN110854826B CN201910994969.8A CN201910994969A CN110854826B CN 110854826 B CN110854826 B CN 110854826B CN 201910994969 A CN201910994969 A CN 201910994969A CN 110854826 B CN110854826 B CN 110854826B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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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- 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]
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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
- 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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses a three-out-of-two protection fault diagnosis and processing method for a flexible-straight converter valve, which relates to the technical field of flexible-straight converter valve protection and comprises the following steps: when the 'two out of three' protection device of the flexible direct converter valve fails, judging whether the protection device belongs to a serious fault, and if the protection device belongs to the serious fault, stopping the operation of the corresponding valve control system; for non-serious faults, the number of current channels of a fault bridge arm is compared transversely and longitudinally, and a healthier system is selected to operate. The invention provides a self-diagnosis method for comparatively diagnosing the fault type and the fault degree of the two sets of flexible direct-current converter valve two-out-of-three protection devices, so that frequent switching of a valve control system is avoided, and the running stability of a direct-current system is improved.
Description
Technical Field
The invention relates to the technical field of flexible-straight converter valve protection, in particular to a fault diagnosis and processing method for a flexible-straight converter valve three-out-of-two protection system.
Background
Modular multilevel converter high voltage direct current transmission (modular multilevel converter based HVDC, MMC-HVDC) is a novel transmission technology, and has been widely applied to the aspects of large-scale wind power plant grid connection, power grid interconnection, direct current transmission and the like by virtue of the advantages of modularization, low harmonic content, low loss and the like. At present, a plurality of flexible direct current projects are put into operation at home and abroad, such as domestic Luxi back-to-back direct current, south Australia three-terminal flexible direct current demonstration project, American Trans Bay Cable project and the like, and with the operation of more and more flexible direct current projects, the design of a flexible direct current control protection system becomes mature day by day.
At present, a flexible direct current control protection system adopts a layered design mode and can be divided into the following steps: the system/converter station level control protection, the converter valve level control protection and the power module level control protection. The converter valve level control protection is mainly responsible for receiving instructions issued by a converter level control system, triggering, monitoring and protecting the sub-modules according to the state of the converter valve, is the core of the converter station, and directly determines the safety and reliability of the converter valve and the whole system according to the performance of the converter valve.
In the prior flexible direct current engineering, the protection of the valve control system mostly adopts a configuration mode of adding a software algorithm responsible for the valve control protection into hardware of each set of control system, each set of valve control system is only provided with one set of protection, and if a main set of system meets the protection criterion, the protection trips an outlet. However, each set of valve control is only provided with one set of protection, and if the bridge arm current and the like of the main set valve control system are measured abnormally, no other anti-error measures can cause the protection error outlet to trip, so that the reliability of the direct current system is reduced.
In order to improve the reliability of protection of the valve control system, a protection design adopting a 'two out of three' outlet is provided for bridge arm current electrical quantity protection, namely, two sets of valve control systems are respectively provided with a set of 'two out of three' protection device, the same bridge arm divides bridge arm currents into three paths and simultaneously accesses three protection boards of the 'two out of three' protection device, and when at least two paths of bridge arm currents meet protection criteria, the protection can be carried out to realize the outlet. If one bridge arm current has faults, the protection outlet is switched from three to two to one. However, because two sets of valve control systems (A, B sets of main/standby redundancy) are added with two-out-of-three protection related hardware board cards and communication optical fibers, the failure rate of the device is increased, and if the failure of the valve control systems is not classified according to grades, the valve control systems can be frequently switched or cannot operate in a healthier system, so that the reliability of the operation of the direct current system is influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a fault diagnosis and processing method for a two-out-of-three protection system of a flexible direct current converter valve, which can avoid frequent switching of a valve control system and improve the running stability of a direct current system.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a fault diagnosis and processing method for a three-out-of-two protection system of a flexible-straight converter valve is realized based on two sets of redundant flexible-straight converter valve control systems, each set of flexible-straight converter valve control system comprises a set of three-out-of-two protection devices of the flexible-straight converter valve, each set of the three-out-of-two protection devices of the flexible-straight converter valve is provided with three protection board cards and an outlet board card, each set of the protection board card is connected with bridge arm currents measured by all six bridge arms, and when the same bridge arm current of at least two protection board cards meets the protection criterion set by the protection board card, the outlet board card outputs a protection action signal, and the fault diagnosis and processing method comprises the following steps:
step 1: when the 'two out of three' protection device of the flexible direct current converter valve fails, judging whether the protection device belongs to a serious fault, and if the protection device belongs to the serious fault, executing the step 1-1; if not, executing the step 1-2;
step 1-1: for serious faults, if the 'two out of three' protection device of the flexible straight converter valve has serious faults, the corresponding valve control system quits operation;
step 1-2: for non-serious faults, the protection quantities of 'one out of two' and 'one out of one' of the flexible straight converter valve 'two out of three' protection devices of the two sets of valve control systems are transversely compared, and the valve control system corresponding to the 'two out of one' protection device of the flexible straight converter valve with the largest protection quantity of 'one out of two' and 'one out of one' is selected to operate; if the protection quantity of the two-out-of-one protection device and the protection quantity of the one-out-of-one protection device of the flexible direct current converter valves of the two sets of valve control systems are the same, longitudinally comparing the quantity of the current channels of the fault bridge arms of the flexible direct current converter valve two-out-of-three protection device of the two sets of valve control systems, and selecting the valve control system corresponding to the flexible direct current converter valve two-out-of-three protection device with the least quantity of the current channels of the fault bridge arms to operate; and if the results of the transverse comparison and the longitudinal comparison are the same, keeping the current valve control system to operate.
According to the fault diagnosis and processing method for the two-out-of-three protection system of the flexible-straight converter valve, further, the serious faults include faults of the outlet board card, simultaneous faults of the three bridge arm current measuring optical fibers of the same bridge arm, communication faults of the three sets of protection board cards and the corresponding outlet board card back plate, and the like.
Compared with the prior art, the invention has the beneficial effects that: classifying common faults of the 'two out of three' protection device of the flexible direct converter valve according to grades, quitting the operation of the 'two out of three' protection device of the flexible direct converter valve judged as the serious fault according to a certain method rule, and returning a valve control system corresponding to the 'two out of three' protection device of the flexible direct converter valve with the serious fault to an unavailable state; a self-diagnosis method for transverse comparison and longitudinal comparison of the soft direct converter valve three-out-of-two protection device without serious faults is provided, frequent switching of a valve control system is avoided, and running stability of a direct current system is improved.
Drawings
Fig. 1 is a schematic structural diagram of a valve control system of a flexible straight converter valve according to an embodiment of the invention;
FIG. 2 is a flow chart of a fault diagnosis and processing method of a two-out-of-three protection system of a flexible direct current converter valve according to the present invention;
fig. 3 is a flow chart of a fault diagnosis and processing method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and detailed description.
Example (b):
referring to fig. 1 to 3, in this embodiment, 18 bridge arm currents of 6 bridge arms are respectively connected to three sets of protection boards, and a schematic structural diagram of the flexible-direct converter valve protection system of the embodiment is shown in fig. 1, where each set of protection board is connected to bridge arm current measurement quantities of all six bridge arms, and when the three sets of protection boards are completely normal, a system signal is output in a "two out of three" manner, that is, only when at least two sets of three protection boards act, the protection signal can be output to act through the output board.
A fault diagnosis and processing method for a three-out-of-two protection device of a flexible-straight converter valve comprises the following steps:
step 1: when the 'two out of three' protection device of the flexible direct current converter valve fails, judging whether the protection device belongs to a serious fault, and if the protection device belongs to the serious fault, executing the step 1-1; if not, executing step 1-2. The method comprises the steps of classifying common faults of a 'two out of three' protection device of the flexible direct current converter valve according to grades, defining outlet board card faults, simultaneous faults of three bridge arm current measuring optical fibers of the same bridge arm, communication faults of three sets of protection board cards and corresponding outlet board card back plates and the like as serious faults, and defining faults of one or two bridge arm current measuring optical fibers as non-serious faults.
Step 1-1: and for serious faults, if the 'two out of three' protection device of the flexible straight converter valve has serious faults, the corresponding valve control system is quitted from operation.
Step 1-2: for non-serious faults, such as channel faults of bridge arm currents and the like, the protection quantities of 'one in two' and 'one in one' of the flexible straight converter valve 'two in three' protection devices of the two sets of valve control systems are transversely compared, and the valve control system corresponding to the flexible straight converter valve 'two in three' protection device with the maximum protection quantity of 'one in two' and 'one in one' is selected to operate; if the protection quantity of the two-out-of-one protection device and the protection quantity of the one-out-of-one protection device of the flexible direct current converter valves of the two sets of valve control systems are the same, longitudinally comparing the quantity of the current channels of the fault bridge arms of the flexible direct current converter valve two-out-of-three protection device of the two sets of valve control systems, and selecting the valve control system corresponding to the flexible direct current converter valve two-out-of-three protection device with the least quantity of the current channels of the fault bridge arms to operate; and if the results of the transverse comparison and the longitudinal comparison are the same, keeping the current valve control system to operate.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention accordingly, and not to limit the protection scope of the present invention accordingly. All equivalent changes or modifications made in accordance with the spirit of the present disclosure are intended to be covered by the scope of the present disclosure.
Claims (2)
1. A fault diagnosis and processing method for a three-in-two protection system of a flexible-straight converter valve is realized based on two sets of redundant flexible-straight converter valve control systems, each set of flexible-straight converter valve control system comprises a set of three-in-two protection device of the flexible-straight converter valve, each set of three-in-two protection device of the flexible-straight converter valve is provided with three protection board cards and an outlet board card, each set of protection board card is connected with bridge arm currents measured by all six bridge arms, and when the same bridge arm current of at least two protection board cards meets the protection criterion set by the protection board card, the outlet board card outputs a protection action signal, and the fault diagnosis and processing method is characterized by comprising the following steps:
step 1: when the 'two out of three' protection device of the flexible direct current converter valve fails, judging whether the protection device belongs to a serious fault, and if the protection device belongs to the serious fault, executing the step 1-1; if not, executing the step 1-2;
step 1-1: for serious faults, if the 'two out of three' protection device of the flexible straight converter valve has serious faults, the corresponding valve control system quits operation;
step 1-2: for non-serious faults, the protection quantities of 'one out of two' and 'one out of one' of the flexible straight converter valve 'two out of three' protection devices of the two sets of valve control systems are transversely compared, and the valve control system corresponding to the 'two out of one' protection device of the flexible straight converter valve with the largest protection quantity of 'one out of two' and 'one out of one' is selected to operate; if the protection quantity of the two-out-of-one protection device and the protection quantity of the one-out-of-one protection device of the flexible direct current converter valves of the two sets of valve control systems are the same, longitudinally comparing the quantity of the current channels of the fault bridge arms of the flexible direct current converter valve two-out-of-three protection device of the two sets of valve control systems, and selecting the valve control system corresponding to the flexible direct current converter valve two-out-of-three protection device with the least quantity of the current channels of the fault bridge arms to operate; and if the results of the transverse comparison and the longitudinal comparison are the same, keeping the current valve control system to operate.
2. The fault diagnosis and processing method for the two-out-of-three protection system of the flexible-straight converter valve according to claim 1, wherein the serious fault comprises an outlet board card fault, a simultaneous fault of three bridge arm current measurement optical fibers of the same bridge arm, or a communication fault between three sets of protection board cards and corresponding outlet board card back plates.
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| CN201910994969.8A CN110854826B (en) | 2019-10-18 | 2019-10-18 | Fault diagnosis and processing method for two-out-of-three protection system of flexible direct converter valve |
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