CN112165242B - Control protection system of high-voltage flexible converter valve and protection method and device thereof - Google Patents
Control protection system of high-voltage flexible converter valve and protection method and device thereof Download PDFInfo
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- CN112165242B CN112165242B CN202011018320.1A CN202011018320A CN112165242B CN 112165242 B CN112165242 B CN 112165242B CN 202011018320 A CN202011018320 A CN 202011018320A CN 112165242 B CN112165242 B CN 112165242B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02H7/122—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 for inverters, i.e. dc/ac converters
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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
- H02H7/125—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 for rectifiers
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Abstract
The system comprises a valve control interface device, a measuring device, 6 photoelectric current transformers, at least one valve control device, a capacitance grounding short-circuit device, an external functional interface device and a water leakage detection device. The photocurrent transformer is used for detecting the current of the bridge arm; the water leakage detection device is used for detecting the water leakage of the high-pressure flexible converter valve; the valve control device is used for monitoring the state of each submodule on each bridge arm; the valve control interface device is used for sending related signals sent by the device to an upper-level control and protection system, receiving control and protection control signals sent by the upper-level control and protection system, and sending short circuit grounding signals and/or switching number information; the capacitance grounding short-circuit device is used for carrying out secondary discharge operation on the sub-modules based on the short-circuit grounding signal; the valve control device is used for sending switching control signals to the submodules based on the switching number information, so that the high-pressure flexible converter valve is protected, and the normal work of the high-pressure flexible converter valve is guaranteed.
Description
Technical Field
The application relates to the technical field of electric equipment, in particular to a control protection system of a high-voltage flexible converter valve and a protection method and device thereof.
Background
With the proposal of the global energy internet concept, the demand for power generation and grid connection of renewable energy sources such as wind energy, solar energy and the like is higher and higher. However, these renewable energy power generation sources are intermittent and uncertain, resulting in the inability of conventional ac grids to properly scale. The flexible direct current transmission system can flexibly control active power and reactive power and supply power to a weak alternating current system, and becomes an optimal choice for solving new energy power generation grid connection and long-distance transmission at present.
The flexible high-voltage converter station is an important component of a flexible direct-current transmission system, direct-current equipment in the converter station is numerous, the manufacturing cost is higher than that of traditional direct-current transmission, the high-voltage flexible converter valve is core equipment of the flexible high-voltage converter station, and in order to ensure normal work of the converter station, reliable and effective protection must be provided for the high-voltage flexible converter valve.
Disclosure of Invention
In view of this, the present application provides a control protection system for a high-voltage flexible converter valve, and a protection method and a protection device thereof, which are used for protecting the high-voltage flexible converter valve to ensure normal operation of the high-voltage flexible converter station.
In order to achieve the above object, the following solutions are proposed:
the control protection system for the high-voltage flexible converter valve comprises a valve control interface device, at least one measuring device, 6 photocurrent transformers, at least one valve control device, a capacitance grounding short-circuit device, an external function interface device and a water leakage detection device, wherein:
each photocurrent transformer is arranged on one bridge arm of the high-voltage flexible converter valve and used for detecting the current of the bridge arm and outputting an obtained current signal to the measuring device;
the measuring device is used for receiving the current signals sent by each photocurrent transformer and sending a plurality of current signals to the valve control interface device;
the water leakage detection device is used for detecting the water leakage of the high-pressure flexible converter valve, outputting a water leakage alarm signal according to the water leakage, and outputting the water leakage alarm signal to the external function interface device;
the external function interface device is used for outputting the water leakage alarm signal to the valve control interface device;
the valve control device is used for monitoring the state signal of each submodule on each bridge arm and sending the state signal to the valve control interface device;
the valve control interface device is used for sending the water leakage alarm signal, the plurality of current signals and/or the state signal to an upper-level control and protection system, receiving a control and protection control signal issued by the upper-level control and protection system according to the water leakage alarm signal, the state signal and/or the plurality of current signals, and sending a short circuit grounding signal and/or switching number information based on the control and protection control signal;
the capacitor grounding short-circuit device is used for carrying out secondary discharge operation on the sub-module capacitor of the corresponding sub-module based on the short-circuit grounding signal;
and the valve control device is also used for determining the position of the submodule needing to be switched on and off based on the switching-on and switching-off number information and sending a switching-on and switching-off control signal to the submodule at the position.
Optionally, a two-out-of-three functional module is arranged in the valve control interface device.
Optionally, an ignition control module is arranged in the valve-controlled interface device, wherein:
the ignition control module is used for converting the received reference voltage value into an on-off index of the sub-module on each bridge arm, converting the reference voltage value into a phase voltage reference value, and further calculating to obtain a target voltage value of each sub-module.
Optionally, the water leakage detection device is disposed in a water collection area at the bottom of the valve tower of the flexible converter valve, and is configured to collect water leakage collected by the water collection area.
Optionally, the flexible converter valve is provided with a loop control module, wherein:
the circulating current control module is used for generating expected transient power to charge the sub-modules when the phase current is very low.
Optionally, the flexible converter valve is provided with a charge-discharge module, wherein:
in the charging stage, the charging and discharging module is used for charging the submodule, communication is built in when the submodule is charged to a preset first charging zone bit, and the discharging resistor is withdrawn when the submodule is charged to a preset second charging zone bit;
in the discharging stage, the charging and discharging module is used for discharging the sub-module, the discharging resistor of the sub-module is switched in when the sub-module is discharged to a preset first discharging zone bit, and the discharging monitoring function is switched in when the sub-module is continuously discharged to a second discharging zone bit.
A protection method applied to the control protection system as described above, optionally, the protection method includes the steps of:
and when the sub-module fails, performing sub-module protection action on the sub-module with the failure.
Optionally, the method further comprises the steps of:
and when the bridge arm fails, executing bridge arm protection actions on the failed bridge arm, wherein the bridge arm protection actions comprise alarming and tripping.
A protection device applied to the control protection system as described above, optionally, the protection device comprises:
and the first protection module is used for executing sub-module protection actions on the sub-module with the fault when the sub-module has the fault.
Optionally, the method further includes:
and the second protection module is used for executing bridge arm protection actions on the failed bridge arm when the bridge arm fails, and the bridge arm protection actions comprise alarming and tripping.
The technical scheme can show that the control protection system for the high-voltage flexible converter valve and the protection method and device thereof are disclosed, and the system comprises a valve control interface device, at least one measuring device, 6 photocurrent transformers, at least one valve control device, a capacitance grounding short-circuit device, an external function interface device and a water leakage detection device. The photocurrent transformer is used for detecting the current of the bridge arm and generating a current signal; the water leakage detection device is used for detecting the water leakage of the high-pressure flexible converter valve and outputting a water leakage alarm signal; the valve control device is used for monitoring the state of each submodule on each bridge arm and outputting a state signal; the valve control interface device is used for sending a water leakage alarm signal, a plurality of current signals and/or state signals to an upper-level control and protection system, receiving control and protection control signals sent by the current signals and sending short circuit grounding signals and/or switching number information; the capacitance grounding short-circuit device is used for carrying out secondary discharge operation on the sub-modules based on the short-circuit grounding signal; the valve control device is also used for sending switching control signals to the submodules based on the switching number information, so that the high-pressure flexible converter valve is protected, and the normal work of the high-pressure flexible converter valve is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a block diagram of a control protection system of a high-pressure flexible converter valve according to an embodiment of the present application;
FIG. 2 is a topological structure diagram of a high-pressure flexible converter valve according to an embodiment of the present application;
FIG. 3 is a topological structure diagram of a submodule of a high-pressure flexible converter valve according to an embodiment of the present application;
FIG. 4 is a schematic view of a water leakage detection device according to an embodiment of the present application;
FIG. 5 is a flow chart of a protection method according to an embodiment of the present application;
fig. 6 is a block diagram of a protection device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example one
Fig. 1 is a block diagram of a control and protection system of a high-pressure flexible converter valve according to an embodiment of the present application.
The protection control system provided by the embodiment is used for protecting a high-voltage flexible converter valve, and the topological structure of the high-voltage flexible converter valve is shown in fig. 2, wherein the topological structure comprises 6 bridge arms, each bridge arm comprises a plurality of sub-modules, and the topological structure of the sub-modules.
As shown in fig. 3, each sub-module includes an IGBT1 and IBTB2, a discharge resistor R, a discharge switch S2 connected in series with the discharge resistor, a switch S1, and a short-circuit ground switch S3. A freewheeling diode is connected in parallel with both IGBT1 and IGBT 2. The submodule also comprises a capacitor C, the function of which is well known in the art and will not be described in detail here.
As shown in fig. 1, the control protection device provided in this embodiment includes a valve-controlled interface device 10, at least one measuring device 20, 6 photocurrent transformers 30, at least one valve-controlled device 40, a capacitance ground short-circuit device 50, an external function interface device 60, and a water leakage detection device 70.
The optical current transformers are respectively arranged on one bridge arm of the high-voltage flexible converter valve, the number of the bridge arms is 6, so that the number of the optical current transformers is 6, the optical current transformers are in signal connection with the measuring device through optical fibers and are used for respectively detecting the current of the corresponding bridge arm and outputting the obtained corresponding current signal to the measuring device. The measuring device is used for receiving the current signals sent by each photocurrent transformer, is connected with the valve control interface device through optical fiber signals, and is used for collecting a plurality of current signals and sending the current signals to the valve control interface device;
in the present embodiment, a configuration of a plurality of measuring devices is adopted, and 3 measuring devices are configured in total, as required by a redundant configuration. And the current sensors are used for respectively summarizing the obtained 6 current signals and respectively sending the current signals to the valve control interface device.
The water leakage detection device is used for detecting the water leakage of the high-pressure flexible converter valve, is connected with the external functional interface device through an optical fiber signal, and is used for outputting a water leakage alarm signal according to the water leakage and outputting the water leakage alarm signal to the external functional interface device; the external function interface device is connected with the valve control interface device through optical fiber signals and used for outputting the received water leakage alarm signal to the valve control interface device.
The water collecting area and the water leakage detection device are arranged at the bottom of the valve tower of the high-pressure flexible converter valve, the real-time detection function is achieved, and the normal operation of the valve cannot be influenced by slight local water leakage. When water leaks from the valve tower, the leaked water is collected into a container of the water leakage detection device through the inclined surface of the water collection area.
As shown in fig. 4, the water leakage detecting device includes a container 100, a float 101, and a light blocker 102, and the light blocker on the float changes in height according to the amount of water. When the height is raised to the alarm position, the corresponding optical channel is blocked (the light through hole is staggered with the optical channel), and the water leakage detection device can not receive the corresponding return signal and can send alarm information to the valve control interface device. Each valve tower is provided with an independent signal transmission system, so that the water leakage valve tower can be quickly determined. The water leakage detection device adopts a level 2 alarm according to the water leakage amount, the water leakage flow is larger than W1, the first level water leakage alarm, the water leakage flow is larger than W2, and the second level water leakage alarm.
The valve control device is used for monitoring the state signal of each submodule on each bridge arm, is connected with the valve control interface device through an optical fiber signal and is used for sending the state signal to the valve control interface device. Also based on the principle of redundant configuration, the system comprises a plurality of valve control devices. The state information includes conduction or locking of the sub-modules, whether an internal board card is damaged, whether the bypass switch is closed, and the like.
The valve control interface device is used for sending the received water leakage alarm signal, a plurality of current signals and/or state signals to an upper-level control and protection system, the upper-level control and protection system makes corresponding decisions after receiving the signals and outputs control and protection control signals according to decision results, and the valve control interface device analyzes after receiving modulation signals containing the control and protection control signals and sends out short circuit grounding signals and/or switching number information according to analysis contents.
The capacitor grounding short-circuit device carries out secondary discharge operation on the sub-module capacitor of the corresponding sub-module after receiving the short-circuit grounding signal; the valve control device is also used for determining the position of the submodule needing to be switched on and off based on the switching-on and switching-off number information, and sending a switching-on and switching-off control signal to the submodule control device of the submodule at the position, so that the submodule control device controls the submodule to execute a switching-on and switching-off action, and voltage balance of the converter valve is realized.
It can be seen from the above technical solutions that, the present embodiment provides a control protection system for a high-voltage flexible converter valve, which includes a valve control interface device, at least one measuring device, 6 photocurrent transformers, at least one valve control device, a capacitance ground short circuit device, an external functional interface device, and a water leakage detection device. The photocurrent transformer is used for detecting the current of the bridge arm and generating a current signal; the water leakage detection device is used for detecting the water leakage of the high-pressure flexible converter valve and outputting a water leakage alarm signal; the valve control device is used for monitoring the state of each submodule on each bridge arm and outputting a state signal; the valve control interface device is used for sending a water leakage alarm signal, a plurality of current signals and/or state signals to an upper-level control and protection system, receiving control and protection control signals sent by the current signals and sending short circuit grounding signals and/or switching number information; the capacitance grounding short-circuit device is used for carrying out secondary discharge operation on the sub-modules based on the short-circuit grounding signal; the valve control device is also used for sending switching control signals to the submodules based on the switching number information, so that the high-pressure flexible converter valve is protected, and the normal work of the high-pressure flexible converter valve is ensured.
A two-out-of-three functional module is arranged in the valve control interface device. The two-out-of-three functional module is arranged in an internal board card of the valve control interface device, namely two or more protection actions are regarded as effective actions, and the two-out-of-three functional module is mainly used for improving the protection reliability and preventing the occurrence of misoperation.
After a short-circuit grounding signal is sent by the valve control interface device, the high-voltage flexible converter valve is locked and then discharges through the discharge resistor in the submodule, and then the device for carrying out secondary discharge on the submodule capacitor is used for carrying out short circuit on the positive electrode and the negative electrode of the single submodule capacitor, releasing residual charge and releasing S shown in figure 33And closing is performed.
The valve control interface device is internally provided with an ignition control module which is used for converting a received reference voltage value into an on-off index aiming at each sub-module on a bridge arm, then sending the index to an upper-level control and protection system, converting the reference voltage into a phase voltage reference value (subtracting the upper and lower bridge arm voltage reference values) in the period of converting the received bridge arm voltage reference value, and then converting the obtained phase voltage reference value into a target voltage value of each sub-module through further calculation.
The high-voltage flexible converter valve is provided with a circulation control module which is mainly used for generating expected transient current when the converted phase current is very low, and charging or discharging the submodule to facilitate the voltage control of the submodule. In addition, the function can also restrain harmonic current, thereby reducing the loss caused by the circular current to the minimum.
The logic of switching on and off of the internal resistance of a single submodule of the high-voltage flexible converter valve is as follows: when the converter valve normally operates, the S1 switch is in an open state, the internal resistance of the sub-modules is in a bypass state, and voltage sharing among the sub-modules is realized through valve control internal logic. Before the converter valve is unlocked (during charging), the AS switch can be selectively switched on or switched off according to the actual voltage of the submodules, so that voltage sharing among the submodules is realized.
The high-voltage flexible converter valve is provided with a unique charging and discharging module, the module is used for setting a first charging marker bit and a second charging marker bit in a charging stage, when the first charging marker bit is charged, the submodule reaches a wake-up voltage, and communication is built inside the submodule. When the converter is charged to the second charging zone bit, the converter valve reaches the unlocking voltage, the unlocking condition is met, and the discharging resistor exits.
And in the discharging stage, setting a first discharging zone bit and a second discharging zone bit, putting a discharging resistor into the submodule when the submodule discharges to the first discharging zone bit, discharging through the resistor, and putting a discharging monitoring enable into the submodule when the submodule discharges to the second discharging zone bit, wherein the discharging monitoring enable is used for judging whether the submodule is normal in communication or not, and the condition of communication loss is prevented from occurring in the next charging. The discharging resistor is in an input state, and the discharging resistor is withdrawn before next unlocking.
Example two
As shown in fig. 5, the present embodiment provides a flowchart of a protection method.
As shown in fig. 5, the protection method provided in this embodiment is applied to the control protection system of the high-voltage flexible converter valve provided in the previous embodiment, and specifically includes the following steps:
s1: and executing the sub-module protection action when the sub-module fails.
Specifically, when sub-module faults caused by various reasons are detected, including semiconductor faults, internal communication faults, sub-module controller faults, sub-module capacitor faults, and communication faults between a valve control module and a sub-module, the sub-module with the faults can be isolated by closing a bypass switch. The protection actions include:
when the bypass switch fails to be closed, applying for tripping;
when the number of bypassed fault submodules reaches a fixed value, a trip is applied.
In addition, the method also comprises the following steps:
s2: and executing the bridge arm protection action when the bridge arm has a fault.
When any bridge arm of the high-voltage flexible converter valve operates at a current higher than a fixed value for a certain time, the converter valve is at risk of damage caused by overhigh load. The protection is used for detecting overload of a converter valve bridge arm caused by system disturbance or fault, and six bridge arm direct currents of the converter valve are used as criteria. The protection actions include:
and (4) alarming: the bridge arm current exceeds the alarm section fixed value and lasts for a certain time.
Tripping: the bridge arm current exceeds the fixed value of the trip section and lasts for a certain time.
Through the protection action, any submodule and any bridge arm can be protected, the damage of expensive submodules is avoided, and the damage of the whole high-voltage flexible converter valve caused by the fault of the bridge arm can be further avoided.
EXAMPLE III
As shown in fig. 6, the present embodiment provides a block diagram of a protection device.
As shown in fig. 6, the protection device provided in this embodiment is applied to the control protection system of the high-voltage flexible converter valve provided in the previous embodiment, and specifically includes a first protection module 201.
The first protection module is used for executing sub-module protection actions when the sub-module fails.
Specifically, when sub-module faults caused by various reasons are detected, including semiconductor faults, internal communication faults, sub-module controller faults, sub-module capacitor faults, and communication faults between a valve control module and a sub-module, the sub-module with the faults can be isolated by closing a bypass switch. The protection actions include:
when the bypass switch fails to be closed, applying for tripping;
when the number of bypassed fault submodules reaches a fixed value, a trip is applied.
In addition, a second protection module 202 is included.
The second protection module is used for executing the bridge arm protection action when the bridge arm has a fault.
When any bridge arm of the high-voltage flexible converter valve operates at a current higher than a fixed value for a certain time, the converter valve is at risk of damage caused by overhigh load. The protection is used for detecting overload of a converter valve bridge arm caused by system disturbance or fault, and six bridge arm direct currents of the converter valve are used as criteria. The protection actions include:
and (4) alarming: the bridge arm current exceeds the alarm section fixed value and lasts for a certain time.
Tripping: the bridge arm current exceeds the fixed value of the trip section and lasts for a certain time.
By the aid of the protection module, any sub-module and any bridge arm can be protected, expensive sub-modules are prevented from being damaged, and further the whole high-voltage flexible converter valve can be prevented from being damaged due to faults of the bridge arm.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The technical solutions provided by the present invention are described in detail above, and the principle and the implementation of the present invention are explained in this document by applying specific examples, and the descriptions of the above examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. The control protection system for the high-voltage flexible converter valve is characterized by comprising a valve control interface device, at least one measuring device, 6 photocurrent transformers, at least one valve control device, a capacitance grounding short-circuit device, an external functional interface device and a water leakage detection device, wherein:
each photocurrent transformer is arranged on one bridge arm of the high-voltage flexible converter valve and used for detecting the current of the bridge arm and outputting an obtained current signal to the measuring device;
the measuring device is used for receiving the current signals sent by each photocurrent transformer and sending a plurality of current signals to the valve control interface device;
the water leakage detection device is used for detecting the water leakage of the high-pressure flexible converter valve, outputting a water leakage alarm signal according to the water leakage, and outputting the water leakage alarm signal to the external function interface device;
the external function interface device is used for outputting the water leakage alarm signal to the valve control interface device;
the valve control device is used for monitoring the state signal of each submodule on each bridge arm and sending the state signal to the valve control interface device;
the valve control interface device is used for sending the water leakage alarm signal, the plurality of current signals and/or the state signal to an upper-level control and protection system, receiving a control and protection control signal issued by the upper-level control and protection system according to the water leakage alarm signal, the state signal and/or the plurality of current signals, and sending a short circuit grounding signal and/or switching number information based on the control and protection control signal;
the capacitor grounding short-circuit device is used for carrying out secondary discharge operation on the sub-module capacitor of the corresponding sub-module based on the short-circuit grounding signal;
and the valve control device is also used for determining the position of the submodule needing to be switched on and off based on the switching-on and switching-off number information and sending a switching-on and switching-off control signal to the submodule at the position.
2. The control protection system of claim 1, wherein a two-out-of-three functional module is disposed within said valve controlled interface device.
3. The control and protection system of claim 1, wherein an ignition control module is disposed within said valve controlled interface device, wherein:
the ignition control module is used for converting the received reference voltage value into an on-off index of the sub-module on each bridge arm, converting the reference voltage value into a phase voltage reference value, and further calculating to obtain a target voltage value of each sub-module.
4. The control and protection system according to claim 1, wherein said water leakage detecting means is provided in a sump area at the bottom of a valve tower of said flexible converter valve for collecting water leakage collected in said sump area, and comprises a container and a float in said container, said float being provided with a light blocking means for blocking the passage of light.
5. The control and protection system of claim 1, wherein the flexible converter valve is provided with a loop control module, wherein:
the circulating current control module is used for generating expected transient power to charge the sub-modules when the phase current is very low.
6. The control and protection system of claim 1, wherein the flexible converter valve is provided with a charge-discharge module, wherein:
in the charging stage, the charging and discharging module is used for charging the submodule, communication is built in when the submodule is charged to a preset first charging zone bit, and the discharging resistor is withdrawn when the submodule is charged to a preset second charging zone bit;
in the discharging stage, the charging and discharging module is used for discharging the sub-module, the discharging resistor of the sub-module is switched in when the sub-module is discharged to a preset first discharging zone bit, and the discharging monitoring function is switched in when the sub-module is continuously discharged to a second discharging zone bit.
7. A protection method applied to the control protection system according to any one of claims 1 to 6, characterized in that the protection method comprises the following steps:
and when the sub-module fails, performing sub-module protection action on the sub-module with the failure.
8. The protection method according to claim 7, further comprising the steps of:
and when the bridge arm fails, executing bridge arm protection actions on the failed bridge arm, wherein the bridge arm protection actions comprise alarming and tripping.
9. A protection device applied to the control protection system according to any one of claims 1 to 6, wherein the protection device comprises:
and the first protection module is used for executing sub-module protection actions on the sub-module with the fault when the sub-module has the fault.
10. The protective device of claim 9, further comprising:
and the second protection module is used for executing bridge arm protection actions on the failed bridge arm when the bridge arm fails, and the bridge arm protection actions comprise alarming and tripping.
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| CN113532771A (en) * | 2021-06-10 | 2021-10-22 | 中国南方电网有限责任公司超高压输电公司 | Water leakage detection system for power transmission converter valve and monitoring and fault replacement method |
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