CN111431147B - Fault switching system and method for valve control system protection device of flexible direct current converter valve - Google Patents
Fault switching system and method for valve control system protection device of flexible direct current converter valve Download PDFInfo
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- CN111431147B CN111431147B CN202010294869.7A CN202010294869A CN111431147B CN 111431147 B CN111431147 B CN 111431147B CN 202010294869 A CN202010294869 A CN 202010294869A CN 111431147 B CN111431147 B CN 111431147B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- 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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Abstract
The invention discloses a fault switching system and method for a flexible direct current converter valve control system protection device, and relates to the field of flexible direct current power transmission. The invention reasonably switches by using the fault switching system according to the fault conditions of different protection devices, and increases the function of manual intervention on the basis of automatic judgment by the valve control system preferentially, thereby ensuring the safe and reliable operation of the valve control system.
Description
Technical Field
The invention relates to the field of flexible direct current power transmission, in particular to a fault switching system and method for a valve control system protection device of a flexible direct current converter valve.
Background
The modular multilevel converter high-voltage direct current transmission (modular multilevel converter based HVDC, MMC-HVDC) has the advantages of easy active and reactive power regulation, low harmonic level and the like because the modular multilevel converter high-voltage direct current transmission (MMC-HVDC) does not need reactive power compensation and has no problem of commutation failure, so that the technology is widely applied to the field of electric power. At present, a plurality of flexible direct currents engineering are put into operation or built in China, such as the put-into-operation flexible direct current at five ends of Zhoushan, the flexible direct current at mansion doors, the back-to-back direct current in Shanxi, the flexible direct current at multiple ends of Yu Hubei, the flexible direct current at multiple ends of the built Baihe beach, the mixed direct current at multiple ends of Udongde and the like. With repeated and continuous verification in the flexible direct current operation and construction, the design of the flexible direct current is more mature and complete.
The valve control system is the central nerve of the flexible direct current transmission system, and the function of the flexible direct current converter valve is completely realized by means of complex and flexible control protection. Because the capacity of the flexible direct current engineering in early operation is small, and the requirement on the valve control protection system is not high, each valve control system is only provided with one set of protection, when abnormal faults or false actions such as measurement, communication, board card and the like occur, the protection trips an outlet, and the impact on the direct current system is small. With the development of flexible direct current to high capacity and high voltage, the safety and reliability of the valve control protection system can not meet the requirements. In order to improve the safety and reliability of the valve control protection system, the existing valve control system adopts a main redundant system design with completely consistent configuration, each valve control system comprises a set of two-out-of-three protection system with complete functions, and the two sets of protection systems work completely and independently without mutual influence.
By counting the stability and the failure rate of the board cards of the three-out-of-two protection device in the existing flexible and straight engineering, the probability that a single board card fails in the operation process of the equipment is found to be highest, and the situations that both sets of system board cards fail or a plurality of board cards of a single set of system fail are few, so that if the existing failure diagnosis strategy is continued, the valve control system can be in an unhealthy operation state for a long time only by the manual intervention of operation and maintenance personnel or the autonomous control of the valve control system.
Disclosure of Invention
Aiming at the problem that the valve control system is in an unhealthy running state for a long time due to the fact that the valve control system is only under the manual intervention of operation and maintenance personnel or the autonomous control of the valve control system when the valve control protection system is in fault in the prior art, the invention provides a fault switching system and a fault switching method for a valve control system of a flexible direct current converter valve.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a fault switching system of a flexible direct-current converter valve control system protection device comprises two sets of redundant flexible direct-current converter valve control systems, wherein each set of flexible direct-current converter valve control system comprises an independent flexible direct-current converter valve three-to-two protection device, each set of flexible direct-current converter valve three-to-two protection device is provided with three protection board cards and an outlet board card, the outlet board card is used for outputting a protection action signal, the fault switching system also comprises a fault switching device, the fault switching device comprises a first bridge arm current monitor, a second bridge arm current monitor, a first AND gate logic device, a second AND gate logic device and a first OR gate logic device,
the first bridge arm current monitor is used for detecting bridge arm current faults of a 'two out of three' protection device of the first flexible-straight converter valve and selecting a first output port, a second output port, a third output port and a fourth output port to output trigger signals according to the number of the bridge arm current faults;
the second bridge arm current monitor is used for detecting bridge arm current faults of a 'two out of three' protection device of the second flexible-straight converter valve and selecting a fifth output port, a sixth output port, a seventh output port and an eighth output port to output trigger signals according to the number of the bridge arm current faults;
the fifth output port and the second output port are connected to the input end of a first AND gate logic device, the sixth output port and the seventh output port are respectively connected to the input end of the first OR gate logic device, the output end and the fourth output port of the first OR gate logic device are connected to the input end of a second AND gate logic device, the output end of the first AND gate logic device and the output end of the second AND gate logic device are connected to the input end of the second OR gate logic device, and the output end of the second OR gate logic device is connected to the first action outlet;
the first output port and the sixth output port are connected to the input end of a third AND gate logic device, the second output port and the third output port are respectively connected to the input end of a third OR gate logic device, the output end and an eighth output port of the third OR gate logic device are connected to the input end of a fourth AND gate logic device, the output end of the third AND gate logic device and the output end of the fourth AND gate logic device are connected to the input end of the fourth OR gate logic device, and the output end of the fourth OR gate logic device is connected to a second action outlet;
the fourth output port and the eighth output port are connected to the input end of the fifth AND logic device, and the output end of the fifth AND logic device is connected to the third action outlet;
the first one-out-of-two monitor is used for detecting whether the two-out-of-three protection of the first flexible direct current converter valve protection device is returned to the two-out-of-one protection device or not, if yes, a trigger signal is output through an output port of the first flexible direct current converter valve protection device and connected to the input end of the sixth AND gate logic device together with the trigger signal of the second output port, and the output end of the sixth AND gate logic device is connected to the fourth action outlet;
the second two-out-of-one monitor is used for detecting whether the two-out-of-three protection of the second flexible-straight converter valve 'two-out-of-three' protection device is returned to the two-out-of-one state, if yes, a trigger signal is output through an output port of the second flexible-straight converter valve 'two-out-of-three' protection device and connected to the input end of the seventh AND gate logic device together with a trigger signal of a sixth output port, and the output end of the seventh AND gate logic device is connected to the fifth action outlet;
the third output port and the seventh output port are connected to the input end of an eighth AND logic device, and the output end of the eighth AND logic device is connected to a sixth action outlet;
the third output port and the fifth output port are connected to the input end of an eighth AND logic device, the first output port and the seventh output port are connected to the input end of a ninth AND logic device, the output end of the eighth AND logic device and the output end of the ninth AND logic device are connected to the input end of a fifth OR logic device, and the output end of the fifth OR logic device is connected to a seventh action outlet;
the third output port and the second output port are connected to the input end of a tenth AND gate logic device, the second output port and the seventh output port are connected to the input end of an eleventh AND gate logic device, the output end of the tenth AND gate logic device and the output end of the eleventh AND gate logic device are connected to the input end of a sixth OR gate logic device, and the output end of the sixth OR gate logic device is connected to a sixth action outlet.
A fault switching method for a protective device of a valve control system of a flexible direct current converter valve comprises the following steps:
step 1: detecting the number of faults of protection board cards of two sets of three-to-two protection devices of the flexible-straight converter valves in the current state;
step 2: switching is carried out according to the number of the faults of the protection board cards of the two sets of the flexible-straight converter valve two-out-of-three protection devices, wherein,
when one set of soft straight converter valve two-out-of-three protection device has only one protection board card fault, and the other set of soft straight converter valve two-out-of-three protection device has no protection board card fault, switching to the other set of soft straight converter valve two-out-of-three protection device;
when only one protection board card of one set of the three-to-two protection device of the flexible-straight converter valve fails and the other set of the three-to-two protection device of the flexible-straight converter valve returns to the state of one-from-two, the three-to-two protection device of the flexible-straight converter valve is kept to continue to operate;
when three protection board cards of one set of flexible direct converter valve two-out-of-three protection device all fail and at least one protection board card of the other set of flexible direct converter valve two-out-of-three protection device does not fail, switching to the other set of flexible direct converter valve two-out-of-three protection device;
when three protection board cards of one set of the 'two out of three' protection device of the flexible direct converter valve fail, and three protection board cards of the other set of the 'two out of three' protection device of the flexible direct converter valve fail, the flexible direct converter valve control system to which the operating protection device of the 'two out of three' protection device of the flexible direct converter valve belongs trips;
when two protection board cards of one set of flexible straight converter valve two-out-of-three protection device are failed and the other set of flexible straight converter valve two-out-of-three protection device has no protection board card failure, switching to the other set of flexible straight converter valve two-out-of-three protection device;
when two sets of three-out-of-two protection devices of the flexible-straight converter valves have a fault of one protection board card and one protection board card of one of the two sets of three-out-of-two protection devices of the flexible-straight converter valves has a fault of another protection board card, or when one set of three-out-of-two protection devices of the flexible-straight converter valves has a fault of only one protection board card and the other set of three-out-of-two protection devices of the flexible-straight converter valves has a fault of two protection board cards, the flexible-straight converter valve control system with a small number of faults of the protection board cards needs to be manually switched to operate;
when two sets of three-to-two protection devices of the flexible-straight converter valve are both two protection board card faults, manual switching is needed.
Compared with the prior art, the invention has the beneficial effects that: when two sets of valve control systems are normal, if one system protects one board card from faults, the valve control systems can be switched autonomously, the valve control systems are prevented from running in a fault state for a long time, the invention prevents the valve control systems from frequent switching due to the board card faults, designs reasonable switching logic aiming at different fault states, and ensures that the valve control systems run more safely and reliably; the invention organically combines the manual intervention and the valve control autonomous switching, and avoids the valve control system misoperation caused by the manual intervention of operation and maintenance personnel or the autonomous switching of the valve control system.
Drawings
FIG. 1 is a block diagram of a "two out of three" protection configuration for a flexible direct converter valve according to the present invention;
FIG. 2 is a logic diagram of the failover method 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):
a fault switching system for a protection device of a flexible direct-current converter valve control system comprises two sets of redundant flexible direct-current converter valve control systems, each set of flexible direct-current converter valve control system comprises an independent flexible direct-current converter valve three-to-two protection device, each set of flexible direct-current converter valve three-to-two protection device is provided with three protection board cards and one outlet board card, the outlet board cards are used for outputting protection action signals, the three-to-two protection system is configured as shown in figure 1, in order to guarantee reliable detection of bridge arm currents of a flexible direct-current converter valve (6 bridge arms) by the valve control protection system, 3 paths of bridge arm currents of each bridge arm are simultaneously connected into the three protection board cards of the three-to-two protection system, and when at least 2 paths of currents of each bridge arm reach a protection action fixed value, a protection party can be output. If the current quality bit or communication abnormality of 1 path of optical fiber in 3 paths of input of each bridge arm or the corresponding protection board card has a fault, the protection is considered invalid, and the logic of taking two out of three is changed into the logic of taking one out of two. If the fault is more serious, which causes the current quality bit of 1 path of optical fiber in 2 paths of optical fibers, abnormal communication or corresponding board fault, etc., the protection is considered invalid, and the logic of 'two to one' is changed into 'one to one' logic.
The invention also comprises a fault switching device which comprises a first bridge arm current monitor, a second bridge arm current monitor, a first AND gate logic device, a second AND gate logic device and a first OR gate logic device,
the first bridge arm current monitor is used for detecting bridge arm current faults of the first flexible-straight converter valve two-out-of-three protection device, and selecting a first output port, a second output port, a third output port and a fourth output port according to the number of the bridge arm current faults to output trigger signals; the first output port, the second output port, the third output port and the fourth output port respectively represent the situation that the number of bridge arm current faults of the protection device for changing three to two of the first flexible-straight converter valve is 0, 1, 2 and 3, and at the moment, a true value of a trigger signal is output 1.
The second bridge arm current monitor is used for detecting bridge arm current faults of the second flexible-straight converter valve two-out-of-three protection device, and selecting a fifth output port, a sixth output port, a seventh output port and an eighth output port according to the number of the bridge arm current faults to output trigger signals; the fifth output port, the sixth output port, the seventh output port and the eighth output port respectively represent the situation that the number of bridge arm current faults of the second flexible-direct converter valve two-out-of-three protection device is 0, 1, 2 and 3, and at the moment, a true value of a trigger signal is output 1.
A fifth output port and a second output port are connected to the input end of the first AND gate logic device, a sixth output port and a seventh output port are respectively connected to the input end of the first OR gate logic device, the output end of the first OR gate logic device and the fourth output port are connected to the input end of the second AND gate logic device, the output end of the first AND gate logic device and the output end of the second AND gate logic device are connected to the input end of the second OR gate logic device, and the output end of the second OR gate logic device is connected to the first action outlet; a first action exit trigger action: and the first flexible straight converter valve control system to which the first flexible straight converter valve two-out-of-three protection device belongs is switched to the second flexible straight converter valve control system to which the second flexible straight converter valve two-out-of-three protection device belongs to operate.
The first output port and the sixth output port are connected to the input end of a third AND gate logic device, the second output port and the third output port are respectively connected to the input end of the third OR gate logic device, the output end and the eighth output port of the third OR gate logic device are connected to the input end of a fourth AND gate logic device, the output end of the third AND gate logic device and the output end of the fourth AND gate logic device are connected to the input end of the fourth OR gate logic device, and the output end of the fourth OR gate logic device is connected to a second action outlet; a second action exit trigger action: and the second flexible straight converter valve control system to which the second flexible straight converter valve two-out-of-three protection device belongs is switched to the first flexible straight converter valve control system to which the first flexible straight converter valve two-out-of-three protection device belongs to operate.
The fourth output port and the eighth output port are connected to the input end of the fifth AND logic device, and the output end of the fifth AND logic device is connected to the third action outlet; a third action exit trigger action: and tripping the valve control system of the flexible straight converter valve to which the running set of the three-out-of-two protection device belongs.
The first two-out-of-one monitor is used for detecting whether the two-out-of-three protection of the first flexible direct converter valve two-out-of-three protection device is returned to the one-out-of-two protection device, if yes, a trigger signal is output through an output port of the first flexible direct converter valve two-out-of-three monitor and connected with a trigger signal of a second output port to the input end of a sixth AND gate logic device, and the output end of the sixth AND gate logic device is connected to a fourth action outlet; a fourth action exit trigger action: and keeping the first flexible straight converter valve 'two out of three' protection device to continue to operate.
The second two-out-of-one monitor is used for detecting whether the two-out-of-three protection of the second flexible-straight converter valve two-out-of-three protection device is returned to the one-out-of-two protection device, if yes, the output port of the second flexible-straight converter valve two-out-of-two monitor outputs a trigger signal and the trigger signal of the sixth output port are connected to the input end of a seventh AND gate logic device, and the output end of the seventh AND gate logic device is connected to the fifth action outlet; a fifth action exit trigger action: and keeping the second flexible straight converter valve 'two out of three' protection device to continue to operate.
The third output port and the seventh output port are connected to the input end of the eighth AND logic device, and the output end of the eighth AND logic device is connected to the sixth action outlet; a sixth action exit trigger action: and the two sets of redundant flexible straight converter valve control systems are manually switched.
The third output port and the fifth output port are connected to the input end of the eighth AND logic device, the first output port and the seventh output port are connected to the input end of the ninth AND logic device, the output ends of the eighth AND logic device and the ninth AND logic device are connected to the input end of the fifth OR logic device, and the output end of the fifth OR logic device is connected to the seventh action outlet; a seventh action exit trigger action: and switching to the flexible direct converter valve control system without the fault of the protection board card to operate.
And the third output port and the second output port are connected to the input end of a tenth AND gate logic device, the second output port and the seventh output port are connected to the input end of an eleventh AND gate logic device, the output ends of the tenth AND gate logic device and the eleventh AND gate logic device are connected to the input end of a sixth OR gate logic device, and the output end of the sixth OR gate logic device is connected to a sixth action outlet. A sixth action exit trigger action: and the two sets of redundant flexible straight converter valve control systems are manually switched.
A fault switching method for a protective device of a valve control system of a flexible direct current converter valve comprises the following steps:
step 1: detecting the number of faults of protection board cards of two sets of three-to-two protection devices of the flexible-straight converter valves in the current state;
and 2, step: switching is carried out according to the number of the faults of the protection board cards of the two sets of the flexible-straight converter valve two-out-of-three protection devices, wherein,
a. when one set of soft straight converter valve three-to-two protection device has only one protection board card fault, and the other set of soft straight converter valve three-to-two protection device has no protection board card fault, the protection device is switched to the other set of soft straight converter valve three-to-two protection device.
b. When one set of the three-out-of-two protection device of the flexible-straight converter valve has only one protection board card fault and the other set of the three-out-of-two protection device of the flexible-straight converter valve is returned to the state of one-out-of-two, the three-out-of-two protection device of the flexible-straight converter valve is kept to continue to operate.
c. When three protection board cards of one set of three-to-two protection device of the flexible direct current valve fail and at least one protection board card of the other set of three-to-two protection device of the flexible direct current valve fails, the protection device is switched to the other set of three-to-two protection device of the flexible direct current valve.
d. When three protection board cards of one set of the three-out-of-two protection device of the flexible direct current converter valve fail, and three protection board cards of the other set of the three-out-of-two protection device of the flexible direct current converter valve fail, the flexible direct current converter valve control system to which the operating protection device of the set of the three-out-of-two protection device of the flexible direct current converter valve belongs trips.
e. When two protection board cards of one set of flexible straight converter valve two-out-of-three protection device are all in fault, and the other set of flexible straight converter valve two-out-of-three protection device has no protection board card fault, the protection device is switched to the other set of flexible straight converter valve two-out-of-three protection device.
f. When two sets of three-out-of-two protection devices of the flexible-straight converter valves have a fault of one protection board card and one protection board card of the two sets of three-out-of-two protection devices of the flexible-straight converter valves has a fault, or when one set of three-out-of-two protection devices of the flexible-straight converter valves has a fault of only one protection board card and the other set of three-out-of-two protection devices of the flexible-straight converter valves has a fault of two protection board cards, the flexible-straight converter valve control system with the smaller number of faults of the protection board cards needs to be manually switched to operate.
g. When two sets of three-to-two protection devices of the flexible-straight converter valve are both two protection board card faults, manual switching is needed.
The basic process of the method is as follows: referring to fig. 2, a valve control system a and a valve control system B are respectively a first flexible-straight converter valve control system and a second flexible-straight converter valve control system, the valve control systems a/B respectively perform self-detection on their own flexible-straight converter valve "two out of three" protection devices, detect the number of protection board card faults in the current state, and send the detected number of fault board cards into a digital comparator for selection or select in the fault switching system based on the invention. The basic logic and action process is as follows:
a. when the number of the protection fault board cards of the third valve control system set A is 1, the state of the system set B needs to be judged first, if the system set B is not abnormal, switching logic is executed, the system set B operates, and the system set A returns to standby; if the number of the failed board cards in the protection of the second protection in the system B is also 1, switching is not performed, and the system A keeps running;
b. when the number of the failed board cards in the protection of the third system and the second system in the A set is 2, the state of the system in the B set needs to be judged first, if the system in the B set is normal, switching logic is executed, the system in the B set operates, and the A returns to standby;
c. when the number of the protection fault board cards of the third protection of the second protection of the system A is 2, the state of the system B needs to be judged first, if the number of the protection fault board cards of the third protection of the system B is also 2, switching is not performed, and operation and maintenance personnel need to perform comprehensive judgment on the states of other equipment and then perform manual switching to ensure that the system can operate in a healthier state;
d. when two sets of valve control systems detect that 1 protection board card in the 'two-out-of-three' protection is failed and one protection board card in one set of system is failed or one set of valve control system detects that 1 protection board card in the 'two-out-of-three' protection is failed and the other set of valve control system detects that 2 protection board cards in the 'two-out-of-three' protection are failed, the valve control systems do not switch, because the 'two-out-of-two' protection system executes 'one-out-of-one' after the 'two-out-of-three' protection 1 board card is failed, and executes 'one-out-of-one', 'two-out-of-one' and 'one-out-of-one' after the 2 board cards are failed, the conditions of one path are met and the strategy is exported, so that the risk levels of the two states are consistent, the necessity of autonomous switching is avoided, and if the state of other equipment is comprehensively judged by operation and maintenance personnel, the switching can be manually carried out;
e. if the valve control system detects that the three-to-two protection 3 board cards have faults, the system is unavailable, if the other system is in a non-unavailable state, switching logic is executed, and if the other system is unavailable, the valve control system trips.
When two sets of valve control systems are normal, if one system protects one board card from faults, the valve control systems can be switched autonomously, the valve control systems are prevented from running in a fault state for a long time, the invention prevents the valve control systems from frequent switching due to the board card faults, designs reasonable switching logic aiming at different fault states, and ensures that the valve control systems run more safely and reliably; the invention organically combines the manual intervention and the valve control autonomous switching, and avoids the valve control system misoperation caused by the manual intervention of operation and maintenance personnel or the autonomous switching of the valve control system.
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. The fault switching system is characterized by further comprising a fault switching device, wherein the fault switching device comprises a first bridge arm current monitor, a second bridge arm current monitor, a first AND gate logic device to an eleventh AND gate logic device, a first OR gate logic device to a sixth OR gate logic device, a first one-two-out-of-one monitor and a second one-out-of-one monitor;
the first bridge arm current monitor is used for detecting bridge arm current faults of a 'two out of three' protection device of the first flexible-straight converter valve and selecting a first output port, a second output port, a third output port and a fourth output port to output trigger signals according to the number of the bridge arm current faults;
the second bridge arm current monitor is used for detecting bridge arm current faults of a 'two out of three' protection device of the second flexible-straight converter valve and selecting a fifth output port, a sixth output port, a seventh output port and an eighth output port to output trigger signals according to the number of the bridge arm current faults;
the fifth output port and the second output port are connected to the input end of a first AND gate logic device, the sixth output port and the seventh output port are respectively connected to the input end of the first OR gate logic device, the output end and the fourth output port of the first OR gate logic device are connected to the input end of a second AND gate logic device, the output end of the first AND gate logic device and the output end of the second AND gate logic device are connected to the input end of the second OR gate logic device, and the output end of the second OR gate logic device is connected to the first action outlet;
the first output port and the sixth output port are connected to the input end of a third AND gate logic device, the second output port and the third output port are respectively connected to the input end of a third OR gate logic device, the output end and an eighth output port of the third OR gate logic device are connected to the input end of a fourth AND gate logic device, the output end of the third AND gate logic device and the output end of the fourth AND gate logic device are connected to the input end of the fourth OR gate logic device, and the output end of the fourth OR gate logic device is connected to a second action outlet;
the fourth output port and the eighth output port are connected to the input end of the fifth and logic device, and the output end of the fifth and logic device is connected to the third action outlet;
the first one-out-of-two monitor is used for detecting whether the two-out-of-three protection of the first flexible direct current converter valve protection device is returned to the two-out-of-one protection device or not, if yes, a trigger signal is output through an output port of the first flexible direct current converter valve protection device and connected to the input end of the sixth AND gate logic device together with the trigger signal of the second output port, and the output end of the sixth AND gate logic device is connected to the fourth action outlet;
the second two-out-of-one monitor is used for detecting whether the two-out-of-three protection of the second flexible direct converter valve two-out-of-three protection device is returned to the one-out-of-two protection device, if yes, a trigger signal is output through an output port of the second flexible direct converter valve two-out-of-three monitor and connected with a trigger signal of a sixth output port to the input end of the seventh AND gate logic device, and the output end of the seventh AND gate logic device is connected to the fifth action outlet;
the third output port and the seventh output port are connected to the input end of an eighth AND logic device, and the output end of the eighth AND logic device is connected to a sixth action outlet;
the third output port and the fifth output port are connected to the input end of an eighth AND logic device, the first output port and the seventh output port are connected to the input end of a ninth AND logic device, the output end of the eighth AND logic device and the output end of the ninth AND logic device are connected to the input end of a fifth OR logic device, and the output end of the fifth OR logic device is connected to a seventh action outlet;
the third output port and the second output port are connected to the input end of a tenth AND gate logic device, the second output port and the seventh output port are connected to the input end of an eleventh AND gate logic device, the output end of the tenth AND gate logic device and the output end of the eleventh AND gate logic device are connected to the input end of a sixth OR gate logic device, and the output end of the sixth OR gate logic device is connected to a sixth action outlet.
2. A fault switching method for a valve control system protection device of a flexible direct current converter valve is characterized by comprising the following steps:
step 1: detecting the number of faults of protection board cards of two sets of three-to-two protection devices of the flexible-straight converter valves in the current state;
step 2: switching is carried out according to the number of the faults of the protection board cards of the two sets of the flexible-straight converter valve two-out-of-three protection devices, wherein,
when one set of soft straight converter valve two-out-of-three protection device has only one protection board card fault, and the other set of soft straight converter valve two-out-of-three protection device has no protection board card fault, switching to the other set of soft straight converter valve two-out-of-three protection device;
when only one protection board card of one set of the three-to-two protection device of the flexible-straight converter valve fails and the other set of the three-to-two protection device of the flexible-straight converter valve returns to the state of one-from-two, the three-to-two protection device of the flexible-straight converter valve is kept to continue to operate;
when three protection board cards of one set of flexible direct converter valve two-out-of-three protection device all fail and at least one protection board card of the other set of flexible direct converter valve two-out-of-three protection device does not fail, switching to the other set of flexible direct converter valve two-out-of-three protection device;
when three protection board cards of one set of the 'two out of three' protection device of the flexible direct converter valve fail, and three protection board cards of the other set of the 'two out of three' protection device of the flexible direct converter valve fail, the flexible direct converter valve control system to which the operating protection device of the 'two out of three' protection device of the flexible direct converter valve belongs trips;
when two protection board cards of one set of flexible straight converter valve two-out-of-three protection device are failed and the other set of flexible straight converter valve two-out-of-three protection device has no protection board card failure, switching to the other set of flexible straight converter valve two-out-of-three protection device;
when two sets of three-out-of-two protection devices of the flexible-straight converter valves have a fault of one protection board card and one protection board card of one of the two sets of three-out-of-two protection devices of the flexible-straight converter valves has a fault of another protection board card, or when one set of three-out-of-two protection devices of the flexible-straight converter valves has a fault of only one protection board card and the other set of three-out-of-two protection devices of the flexible-straight converter valves has a fault of two protection board cards, the flexible-straight converter valve control system with a small number of faults of the protection board cards needs to be manually switched to operate;
when two sets of three-to-two protection devices of the flexible-straight converter valve are both two protection board card faults, manual switching is needed.
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| CN114069570B (en) * | 2020-07-31 | 2024-03-15 | 南京南瑞继保电气有限公司 | Protection configuration method and configuration device for modularized multi-level converter |
| CN112202323B (en) * | 2020-08-25 | 2021-08-20 | 中国南方电网有限责任公司超高压输电公司广州局 | Redundancy improving method for flexible direct current valve control protection system |
| CN112165242B (en) * | 2020-09-24 | 2021-07-23 | 国网冀北电力有限公司检修分公司 | Control protection system of high-voltage flexible converter valve and protection method and device thereof |
| WO2024082174A1 (en) * | 2022-10-19 | 2024-04-25 | 宁德时代未来能源(上海)研究院有限公司 | Abnormality processing method and two-out-of-three protection device |
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