CN115276389A - Converter valve protection method and related components thereof - Google Patents
Converter valve protection method and related components thereof Download PDFInfo
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- CN115276389A CN115276389A CN202210926967.7A CN202210926967A CN115276389A CN 115276389 A CN115276389 A CN 115276389A CN 202210926967 A CN202210926967 A CN 202210926967A CN 115276389 A CN115276389 A CN 115276389A
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- converter valve
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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
- H02H7/125—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
- H02H7/1257—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 responsive to short circuit or wrong polarity in output circuit
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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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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a converter valve protection method and related components thereof, relates to the field of device protection, and is applied to a processor in a power transmission system, wherein the power transmission system comprises a plurality of energy consumption devices and a converter valve, the processor is respectively connected with the converter valve and the energy consumption devices, each energy consumption device is connected with each group of bridge arm inductors in the converter valve in parallel in a one-to-one correspondence manner, the direct current output current of the converter valve and the bridge arm current on each bridge arm are respectively obtained, the working state of each energy consumption device is controlled according to the direct current output current and each bridge arm current, and the working state comprises an on state and an off state. Because the bridge arm currents on different bridge arms are different and belong to the current inside the converter valve, the bridge arm currents are connected in parallel with the bridge arm inductors through the power consumption device, the converter valve can be protected, the problems that the current at an alternating current input end is too high and the current at a direct current output end is too high can be solved, and in addition, the current inside the converter valve can be ensured to be stable.
Description
Technical Field
The invention relates to the field of device protection, in particular to a converter valve protection method and related components thereof.
Background
Converter valves are devices used for converting alternating current into direct current in a flexible direct current transmission system, and a Modular Multi-level Converter (MMC) based on a half-bridge type becomes one of important components currently used for constructing a transmission system due to the characteristics of high reliability and realization of Multi-terminal transmission. When a power transmission system has a fault, the current in the converter valve is easily overhigh, and further, electronic components in the converter valve are possibly damaged due to overlarge current, so that the overall reliability of the power transmission system is reduced. In order to protect a converter valve in the prior art, an energy consumption device is usually arranged at an alternating current input end of the converter valve and connected in series with the converter valve, or an energy consumption device is arranged at a direct current output end of the converter valve and connected in series with the converter valve, extra current is consumed through the energy consumption device to protect the converter valve, but because the alternating current is not controlled, the energy consumption device is arranged at the alternating current input end, and the excessive current is easily consumed, so that the current in the converter valve is unstable; the problem of too high current at the alternating current input end of the converter valve cannot be solved by arranging the energy consumption device at the direct current output end.
Disclosure of Invention
The invention aims to provide a converter valve protection method and related components thereof, which can protect a converter valve, solve the problems of overhigh current at an alternating current input end and overhigh current at a direct current output end and ensure the stability of the current in the converter valve.
In order to solve the technical problem, the invention provides a converter valve protection method, which is applied to a processor in a power transmission system, wherein the power transmission system further comprises a plurality of energy consumption devices and a converter valve, the processor is respectively connected with the converter valve and the energy consumption devices, each energy consumption device is connected in parallel with each set of bridge arm inductors in the converter valve in a one-to-one correspondence manner, and the converter valve protection method comprises the following steps:
respectively acquiring direct current output current of the converter valve and bridge arm current on each bridge arm;
and controlling the working state of each energy consumption device according to the direct current output current and each bridge arm current, wherein the working state comprises an activation state and a deactivation state.
Preferably, the controlling the working state of each energy consumption device according to the dc output current and each bridge arm current includes:
judging whether the direct current output current is larger than a first preset current value or not;
if so, determining a difference value between the direct current output current and the first preset current value, and controlling the working state of each energy consumption device according to the difference value and each bridge arm current;
and if not, controlling the working states of all the energy consumption devices to be the stop state.
Preferably, the controlling the working state of each energy consumption device according to the difference and each bridge arm current includes:
determining an average current value among the bridge arm currents;
and controlling the working states of the energy consumption devices corresponding to all the bridge arm currents larger than the average current value to be in an enabled state, and controlling the working states of the energy consumption devices corresponding to all the bridge arm currents not larger than the average current value to be in a disabled state.
Preferably, before determining the difference between the dc output current and the first preset current value, the method further includes:
judging whether the direct current output current is larger than a second preset current value or not;
if yes, controlling the working states of all the energy consumption devices to be starting states;
if not, entering a step of determining a difference value between the direct current output current and the first preset current value;
wherein the second preset current value is greater than the first current value.
Preferably, the method further comprises the following steps:
and when the converter valve is detected to execute locking action, controlling each energy consumption device to consume the electric energy emitted by the bridge arm inductor corresponding to each energy consumption device one by one.
Preferably, the power transmission system further includes a plurality of switch modules, the switch module is disposed between two energy consumption devices corresponding to any two adjacent sets of the bridge arm inductors of the converter valve, and after the direct current output current of the converter valve and the bridge arm currents on the bridge arms are respectively obtained, the method further includes:
judging whether the direct current output current is larger than a third preset current value or not;
if yes, controlling all the switch modules to be closed;
if not, controlling all the switch modules to be switched off;
wherein the third preset current value is greater than the second preset current value.
The invention also provides a converter valve protection device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the converter valve protection method as described above when executing said computer program.
The invention also provides a power transmission system, which comprises a converter valve, a plurality of energy consumption devices and the converter valve protection device;
each energy consumption device is connected with each group of bridge arm inductors in the converter valve in parallel in a one-to-one correspondence manner;
the converter valve protection device is respectively connected with the converter valve and each energy consumption device.
Preferably, the energy consumption device comprises:
the circuit comprises a first resistor, a second resistor and a bidirectional switch;
the first resistor, the bidirectional switch and the second resistor are connected in sequence.
The invention also provides a computer readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of the converter valve protection method as described above.
The invention provides a converter valve protection method and related components thereof, relates to the field of device protection, and is applied to a processor in a power transmission system, wherein the power transmission system comprises a plurality of energy consumption devices and a converter valve, the processor is respectively connected with the converter valve and the energy consumption devices, each energy consumption device is connected with each group of bridge arm inductors in the converter valve in parallel in a one-to-one correspondence manner, the direct current output current of the converter valve and the bridge arm currents on each bridge arm are respectively obtained, the working state of each energy consumption device is controlled according to the direct current output current and each bridge arm current, and the working state comprises an on state and an off state. The converter valve can be protected by controlling the working state of the energy consumption device by utilizing the bridge arm current and the direct current output current, the problems that the current of an alternating current input end is too high and the current of a direct current output end is too high can be solved, in addition, the bridge arm current belongs to the current inside the converter valve due to the fact that the bridge arm currents on different bridge arms are different, and the current inside the converter valve can be ensured to be stable by the method that the energy consumption device is connected with a bridge arm inductor in parallel.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a flowchart of a converter valve protection method provided in the present application;
FIG. 2 is a schematic view of a converter valve according to the present disclosure;
fig. 3 is a schematic structural diagram of a converter valve protection device provided by the present application;
fig. 4 is a schematic structural diagram of a power transmission system provided in the present application.
Detailed Description
The core of the invention is to provide a converter valve protection method and related components thereof, which can not only protect the converter valve, but also solve the problems of overhigh current at an alternating current input end and overhigh current at a direct current output end, and can ensure the stability of the current in the converter valve.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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 invention.
Referring to fig. 1, fig. 1 is a flowchart of a converter valve protection method provided in the present application, and is applied to a processor in a power transmission system, where the power transmission system further includes multiple energy consumption devices and a converter valve, the processor is connected to the converter valve and the multiple energy consumption devices, and each energy consumption device is connected to each set of bridge arm inductors in the converter valve in parallel in a one-to-one correspondence manner, and the converter valve protection method includes:
s1: respectively acquiring direct current output current of the converter valve and bridge arm current on each bridge arm;
when a power transmission system breaks down, a line of a direct current output end of a converter valve is subjected to short-circuit fault, the voltage of a fault point is rapidly reduced to zero, each bridge arm submodule in the converter valve generates power to the fault point, so that over-current is generated, and the direct current idc output by the converter valve at the moment is as follows:
wherein t is the time elapsed after the power transmission system fails, t =0 at the time when the power transmission system fails, N is the number of bridge arm submodules in the converter valve, and U is the number of bridge arm submodules in the converter valve CO Is the average value, L, between the capacitor voltages of the bridge arm submodules in the converter valve eq Equivalent inductance value of short-circuit loop for converter valve, I 0 For idc at time t =0, and δ and ω are the current attenuation coefficient of the converter valve and the current angular frequency of the converter valve, respectively, δ and ω being determined according to circuit parameters of the converter valve, the following relations exist for δ and ω:
wherein R is eq Is an equivalent resistance value, L, of a short-circuit loop of the converter valve 0 Is the average inductance value, C, between the bridge arm inductances in the converter valve 0 And the average capacitance value between the capacitors of the bridge arm sub-modules in the converter valve.
Because the capacitor in the bridge arm submodule discharges, the current of the direct current output end of the converter valve is continuously increased, and the alternating current received by the electronic element in the converter valve is increased accordingly, so that the stability of the converter valve is influenced, and therefore, an energy consumption device is required to be arranged to absorb redundant power to protect the converter valve. However, in the prior art, when the energy consumption device is arranged, the energy consumption device is usually connected in series with the converter valve, but the series connection method may affect the stability of the current inside the converter valve or cannot solve the problem of too high current at the ac input end of the converter valve.
In order to solve the above technical problem, in the present application, an energy consumption device is arranged at each set of bridge arm inductance of the converter valve and connected in parallel with the energy consumption device, please refer to fig. 2, fig. 2 is a schematic structural diagram of the converter valve provided in the present application, the converter valve itself includes three bridge arms, which respectively receive iag, ibg and icg currents from an ac input end, two inductances Larm and two bridge arm sub-modules SMs are arranged on each bridge arm, the two inductances Larm on the same bridge arm are referred to as a set of bridge arm inductances, and the converter valve finally outputs idc to a dc output end. The energy consumption device is characterized in that each group of series-connected inductors Larm of the converter valve is connected with an energy consumption device in parallel, two adjacent energy consumption devices are connected through a bidirectional switch, the energy consumption device used in the application is a structure formed by connecting a first resistor R with a bidirectional switch Ts and a second resistor R in series, one end of the first resistor is connected with one end of the inductor Larm above and SMs above respectively, the other end of the first resistor is connected with one end of the bidirectional switch, the other end of the bidirectional switch is connected with one end of the second resistor, the other end of the second resistor is connected with the other end of the inductor Larm below and SMs below respectively, one end of the bidirectional switch Tn is connected with the other end of the bidirectional switch Ts in one energy consumption device, and the other end of the bidirectional switch Tn is connected with the other end of the bidirectional switch Ts in the other energy consumption device. In actual application, firstly, direct current output current of the converter valve and bridge arm current of each bridge arm in the converter valve are obtained, the direct current output current is also idc, the capacitance discharge degree of a bridge arm submodule and the inductance value of an equivalent inductor can be determined through the size of the direct current output current, the capacitance voltage of each bridge arm submodule can be determined through the bridge arm current, the current of a direct current output end can be increased due to the capacitance discharge of the bridge arm submodule, the current can also be increased due to the inductance discharge, the direct current output current and the bridge arm current of each bridge arm can be obtained, and whether large current exists in the converter valve or not can be conveniently determined through the actual direct current output current value and the bridge arm current value subsequently, and redundant power can be determined.
S2: and controlling the working states of the energy consumption devices according to the direct current output current and the bridge arm currents, wherein the working states comprise an activation state and a deactivation state.
The input electricity of the power transmission system is usually three-phase electricity, each phase of electricity is respectively connected with one bridge arm in the converter valve, when the power transmission system fails, the alternating current is not controlled at the moment, so that the current on each bridge arm in the converter valve is possibly different, the situation that the current of part of the bridge arms is overhigh and the current of part of the bridge arms is normal can occur, and based on the situation, in order to accurately control the working state of the energy consumption device and avoid influencing the state of the bridge arms with normal current, when the power transmission system is determined to fail according to the direct current output current, the energy consumption device corresponding to the bridge arm with overhigh current can be controlled to be started, so that the energy consumption device consumes the power in the bridge arm, and meanwhile, the energy consumption device corresponding to the bridge arm with normal current is controlled to be stopped so as to avoid influencing the state of the bridge arms.
In summary, the power transmission system includes a plurality of energy consumption devices and a converter valve, the processor is connected to the converter valve and the plurality of energy consumption devices, each energy consumption device is connected to each set of bridge arm inductors in the converter valve in parallel in a one-to-one correspondence, a direct current output current of the converter valve and bridge arm currents on each bridge arm are obtained respectively, and a working state of each energy consumption device is controlled according to the direct current output current and each bridge arm current, and the working state includes an on state and an off state. The converter valve can be protected by controlling the working state of the energy consumption device by utilizing the bridge arm current and the direct current output current, the problems of overhigh current at an alternating current input end and overhigh current at a direct current output end can be solved, and in addition, the bridge arm current belongs to the internal current of the converter valve, and the stability of the internal current of the converter valve can be ensured by a method of connecting a power consumption device and a bridge arm inductor in parallel.
On the basis of the above-described embodiment:
as a preferred embodiment, controlling the operating state of each energy consumption device according to the dc output current and each bridge arm current includes:
judging whether the direct current output current is larger than a first preset current value or not;
if so, determining a difference value between the direct current output current and a first preset current value, and controlling the working state of each energy consumption device according to the difference value and each bridge arm current;
if not, controlling the working states of all the energy consumption devices to be in the stop state.
In order to accurately control the energy consumption devices, in the present application, since the current at the dc output end of the converter valve increases when the power transmission system fails, a first preset current value may be determined in advance according to the current value at the dc output end of the converter valve when the power transmission system is in a normal condition and the current value at the dc output end of the converter valve when the power transmission system fails, and when the dc output current value of the converter valve is lower than the first preset current value, it is indicated that the power transmission system is normal, and at this time, it is not necessary to start any energy consumption device; when the direct current output current of the converter valve is higher than a first preset current value, which indicates a fault of a power transmission system, the start and stop of each energy consumption device need to be controlled according to the difference value and the bridge arm current on each bridge arm, so that the direct current output current is reduced to be within a normal current range. Based on the method, the energy consumption devices can be accurately controlled by the method of controlling the energy consumption devices through the difference values and the bridge arm currents, and the overhigh direct current output current is avoided.
As a preferred embodiment, controlling the operating state of each energy consumption device according to the difference and each bridge arm current includes:
determining the average current value among the bridge arm currents;
and controlling the working states of the energy consumption devices corresponding to all bridge arm currents larger than the average current value to be starting states, and controlling the working states of the energy consumption devices corresponding to all bridge arm currents not larger than the average current value to be stopping states.
In order to accurately control the energy consumption devices, in the present application, since bridge arm currents of respective bridge arms in the converter valve are different, when a power transmission system fails, a situation that currents on some bridge arms are too large and currents on some bridge arms are normal may occur, so that an average current value between bridge arm currents may be determined first, then the energy consumption device corresponding to the bridge arm having the bridge arm current larger than the average current value is controlled to be activated, and the energy consumption device corresponding to the bridge arm having the bridge arm current smaller than the average current value is controlled to be deactivated, so as to consume power on the bridge arm having the bridge arm current larger than the average current value, further reduce the direct current output current to a range of normal current, and avoid affecting the bridge arm having the normal bridge arm current. Based on the method, the working state of the energy consumption device is controlled through the average current value, and the energy consumption device can be accurately controlled.
As a preferred embodiment, before determining the difference between the dc output current and the first preset current value, the method further includes:
judging whether the direct current output current is larger than a second preset current value or not;
if yes, controlling the working states of all the energy consumption devices to be starting states;
if not, entering a step of determining a difference value between the direct current output current and a first preset current value;
the second preset current value is larger than the first current value.
In order to protect the converter valve, in the application, after a power transmission system fails, the current at the direct current output end of the converter valve may be rapidly increased, and the alternating current passing through electronic components inside the converter valve may also be rapidly increased, so that a situation that the current at the direct current output end is far beyond a normal current range in a short time may occur, in order to avoid a situation that the electronic components inside the converter valve are damaged due to the rapid increase of the current, a second preset current value may be preset, where the second preset current value needs to be greater than the first preset current value, which is equivalent to a second layer of protection measures when the second preset current value is an excessively large direct current output current of the converter valve, and when the direct current output current of the converter valve is detected to be greater than the second preset current value, all energy consumption devices may be controlled to be activated to consume more power inside the converter valve, so as to avoid damage to the electronic components inside the converter valve. Therefore, the converter valve can be well protected by setting a second preset current value and controlling all energy consumption devices to be started when the direct current output current is greater than the second preset current value.
As a preferred embodiment, the method further comprises the following steps:
and when the converter valve is detected to execute locking action, controlling each energy consumption device to consume the electric energy emitted by the bridge arm inductors corresponding to each energy consumption device one by one.
In order to protect the converter valve, in the application, because the converter valve is locked as one of important steps in a power transmission system, the converter valve is locked to enable the power transmission system to stop inputting current to the converter valve, which is equivalent to that the power transmission system enters a standby state after the converter valve is locked, at the moment, the power transmission system still keeps electrified, the inductance inside the converter valve can discharge, in order to enable the inductance inside the converter valve to normally discharge, when the converter valve is detected to perform locking action, energy consumption devices on all bridge arms need to be started, then electric energy discharged by the bridge arm inductances on all the bridge arms is received, which is equivalent to providing a new discharging route for the bridge arm inductances, so that electric energy of the bridge arm inductances can be consumed more quickly, and the current flowing into the bridge arm submodules can be reduced to protect the bridge arm submodules. Therefore, when the converter valve executes the locking action, each energy consumption device is controlled to consume the electric energy of the bridge arm inductor, and the converter valve can be well protected.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a converter valve protection device provided in the present application, including:
a memory 21 for storing a computer program;
a processor 22 for implementing the steps of the converter valve protection method as described above when executing the computer program.
For detailed description of the converter valve protection device provided in the present application, please refer to the embodiment of the converter valve protection method, which is not described herein again.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a power transmission system provided in the present application, including a converter valve 31, a plurality of energy consumption devices 32, and a converter valve protection device 33 as described above;
each energy consumption device 32 is connected in parallel with each set of bridge arm inductor in the converter valve 31 in a one-to-one correspondence manner;
the converter valve protection device 33 is connected to the converter valve 31 and to each energy consuming device 32, respectively.
For a detailed description of a power transmission system provided in the present application, please refer to the embodiment of the converter valve protection method described above, which is not described herein again.
As a preferred embodiment, the energy consuming device 32 comprises:
the circuit comprises a first resistor, a second resistor and a bidirectional switch;
the first resistor, the bidirectional switch and the second resistor are connected in sequence.
In order to simply realize the functions of the energy consumption device 32, in the present application, when the system is in normal operation, a trigger signal is not sent to the device, the bidirectional switch is in an off state, at this time, the energy consumption device does not work, and the converter valve is in normal operation; when redundant power exists in the converter valve, the surplus power on each bridge arm is accurately consumed by controlling the switching state of each bidirectional switch according to the surplus power condition of the system, and the power balance of the alternating current input end and the direct current output end is maintained; when a power transmission system fails, controlling each bidirectional switch to be conducted, and conducting energy-consuming branches of each bridge arm on the converter valve in a bidirectional way to provide a new path for current input by the alternating current input end; when the converter valve is locked, the conduction direction of the bidirectional switch is controlled to be the same as the discharge current direction of the bridge arm inductor, so that the bridge arm energy consumption branch circuit is conducted in a single direction, a new path is provided for the inductor discharge, the current flowing through the bridge arm submodule is reduced, and the attenuation speed of the bridge arm submodule can be increased. In addition, the bidirectional switch may be two anti-parallel thyristors, or may be other elements capable of realizing the bidirectional switch function, which is not limited in this application.
The present application further provides a computer readable storage medium having a computer program stored thereon, which, when being executed by a processor, realizes the steps of the converter valve protection method as described above.
For detailed description of a computer-readable storage medium provided in the present application, please refer to the above-mentioned embodiment of the converter valve protection method, which is not described herein again.
The embodiments in the present description 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. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for protecting a converter valve, wherein the method is applied to a processor in a power transmission system, the power transmission system further includes a plurality of energy consumption devices and the converter valve, the processor is respectively connected to the converter valve and the plurality of energy consumption devices, each energy consumption device is connected in parallel to each set of bridge arm inductors in the converter valve in a one-to-one correspondence, and the method for protecting a converter valve includes:
respectively acquiring direct current output current of the converter valve and bridge arm current on each bridge arm;
and controlling the working state of each energy consumption device according to the direct current output current and each bridge arm current, wherein the working state comprises an activation state and a deactivation state.
2. The converter valve protection method according to claim 1, wherein controlling the operating state of each energy consuming device according to the dc output current and each bridge arm current comprises:
judging whether the direct current output current is larger than a first preset current value or not;
if so, determining a difference value between the direct current output current and the first preset current value, and controlling the working state of each energy consumption device according to the difference value and each bridge arm current;
if not, controlling the working states of all the energy consumption devices to be in the stop state.
3. The converter valve protection method according to claim 2, wherein controlling the operating state of each energy consuming device according to the difference and each bridge arm current comprises:
determining an average current value among the bridge arm currents;
and controlling the working states of the energy consumption devices corresponding to all the bridge arm currents larger than the average current value to be starting states, and controlling the working states of the energy consumption devices corresponding to all the bridge arm currents not larger than the average current value to be stopping states.
4. The converter valve protection method of claim 2, further comprising, prior to determining the difference between the dc output current and the first preset current value:
judging whether the direct current output current is larger than a second preset current value or not;
if yes, controlling the working states of all the energy consumption devices to be starting states;
if not, determining the difference value between the direct current output current and the first preset current value;
wherein the second preset current value is greater than the first current value.
5. The converter valve protection method of claim 1, further comprising:
and when the converter valve is detected to execute a locking action, controlling each energy consumption device to consume the electric energy emitted by the bridge arm inductor corresponding to each energy consumption device one by one.
6. The method for protecting a converter valve according to any one of claims 1 to 5, wherein the power transmission system further includes a plurality of switch modules, the switch modules are disposed between two energy consuming devices corresponding to any two adjacent sets of the bridge arm inductances of the converter valve, and after the direct-current output currents of the converter valve and the bridge arm currents of the bridge arms are respectively obtained, the method further includes:
judging whether the direct current output current is larger than a third preset current value or not;
if yes, controlling all the switch modules to be closed;
if not, controlling all the switch modules to be switched off;
wherein the third preset current value is greater than the second preset current value.
7. A converter valve protection device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the converter valve protection method according to any of claims 1 to 6 when executing said computer program.
8. An electric power transmission system comprising a converter valve and a plurality of energy consuming devices, further comprising a converter valve protection device according to claim 7;
each energy consumption device is connected with each group of bridge arm inductors in the converter valve in parallel in a one-to-one correspondence manner;
the converter valve protection device is respectively connected with the converter valve and each energy consumption device.
9. The power transmission system of claim 8, wherein the energy consuming device comprises:
the circuit comprises a first resistor, a second resistor and a bidirectional switch;
the first resistor, the bidirectional switch and the second resistor are connected in sequence.
10. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of the converter valve protection method according to any one of the claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210926967.7A CN115276389A (en) | 2022-08-03 | 2022-08-03 | Converter valve protection method and related components thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210926967.7A CN115276389A (en) | 2022-08-03 | 2022-08-03 | Converter valve protection method and related components thereof |
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| Publication Number | Publication Date |
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| CN115276389A true CN115276389A (en) | 2022-11-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210926967.7A Pending CN115276389A (en) | 2022-08-03 | 2022-08-03 | Converter valve protection method and related components thereof |
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| CN (1) | CN115276389A (en) |
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