CN113514744A - Method and device for determining withstand voltage value of thyristor and storage medium - Google Patents
Method and device for determining withstand voltage value of thyristor and storage medium Download PDFInfo
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Abstract
The application relates to a method, equipment and storage medium for determining a thyristor withstand voltage value. The method comprises the following steps: the computer equipment acquires a first voltage and a second voltage; the first voltage is the maximum voltage of a protection module corresponding to the thyristor in a stable state, and the protection module is used for protecting the thyristor when the current conversion circuit generates high transient overvoltage; the second voltage is a voltage when the current conversion circuit is in a fault. And the computer equipment determines the withstand voltage limit value of the thyristor when the current conversion circuit fails according to the first voltage and the second voltage, wherein the withstand voltage limit value is used for ensuring that the thyristor is in a normal state when the current conversion circuit fails. The withstand voltage limit value of the thyristor can be accurately determined.
Description
Technical Field
The present disclosure relates to the field of dc power transmission technologies, and in particular, to a method, an apparatus, and a storage medium for determining a withstand voltage of a thyristor.
Background
At present, the current conversion circuit in China has already been built into dozens of direct current transmission projects, and the current conversion circuit mainly takes the conventional direct current project as the main project. The converter valve used in the conventional direct current project realizes the phase conversion function by utilizing the trigger conduction characteristic of the thyristor, and realizes the conversion of alternating current and direct current, so the thyristor becomes a key monitoring and overhauling object of the direct current transmission project. However, part of the direct current engineering is long in operation year, and the thyristor is severe in operation condition, so that the voltage resistance of a large number of thyristors is reduced.
The direct current transmission project adopts a high-power thyristor. And high power thyristors are expensive. In addition, the number of thyristors required by the converter valve is large, and the economic cost and the time cost for integrally replacing the thyristors are high. In addition, in actual field operation, except that the thyristor breaks down in a large area, the voltage resistance of part of the thyristors is reduced, direct current locking cannot be directly caused, and the direct current can still normally operate. Therefore, only part of the voltage resistance performance is seriously reduced on site, and the thyristor threatening the direct current operation needs to be replaced.
However, there is currently no accurate criterion for the selection of thyristors that need to be replaced immediately. The existing solution is to preferentially replace the thyristor with lower voltage resistance according to the number of spare parts of the thyristor. Therefore, on one hand, the thyristor which can be replaced can meet the requirement of direct current operation and does not need to be replaced immediately, thereby increasing the economic cost; on the other hand, because the withstand voltage value of the thyristor is not used as a judgment standard, the thyristor threatening the direct current operation cannot be accurately identified and replaced, and therefore a great direct current blocking risk is generated.
Disclosure of Invention
In view of the above, it is necessary to provide a method, an apparatus, and a storage medium for determining a thyristor withstand voltage value, which can accurately determine a withstand voltage limit value of a thyristor, in view of the above technical problems.
A method for determining the withstand voltage value of a thyristor is applied to an electric power system; the power system comprises computer equipment and a current conversion circuit; the current conversion circuit comprises a converter valve, the converter valve is used for converting a current signal at an input end of the current conversion circuit into alternating current and direct current, the converter valve comprises a bridge arm circuit, the bridge arm circuit comprises at least one thyristor, and the method comprises the following steps:
the computer equipment acquires a first voltage and a second voltage; the first voltage is the maximum voltage of a protection module corresponding to the thyristor in a stable state, and the protection module is used for protecting the thyristor when the current conversion circuit generates high transient overvoltage; the second voltage is a voltage when the current conversion circuit is in a fault.
And the computer equipment determines the withstand voltage limit value of the thyristor when the current conversion circuit fails according to the first voltage and the second voltage, wherein the withstand voltage limit value is used for ensuring that the thyristor is in a normal state when the current conversion circuit fails.
In one embodiment, the current conversion circuit further comprises an ac line; a converter transformer is connected in the alternating current circuit; the second voltage comprises a maximum voltage generated during an ac line fault; the computer device obtaining the second voltage, comprising:
the computer equipment acquires a first quantity and the line voltage of the converter transformer; the first number is the number of thyristors in the bridge arm circuit for conducting the current conversion circuit.
And the computer equipment determines the maximum voltage during the fault period of the alternating current line according to the first quantity and the line voltage of the converter transformer side.
In one embodiment, the current conversion circuit further comprises a direct current line; the second voltage comprises a maximum voltage generated during a dc line fault; the computer device obtaining the second voltage, comprising:
the computer equipment acquires a first number, direct current line voltage and the number of converter valves in the current conversion circuit; the first number is the number of thyristors in the bridge arm circuit for conducting the current conversion circuit.
The computer device determines a maximum voltage generated during the DC fault based on the first number, the DC link voltage, and a number of converter valves in the current conversion circuit.
In one embodiment, two ends of the thyristor are connected with a damping loop in parallel; the second voltage comprises a maximum voltage that the damping loop can withstand; the computer device obtaining the second voltage, comprising:
and the computer equipment acquires the maximum voltage which can be borne by each element of the damping loop.
And the computer equipment determines the maximum voltage bearable by the damping loop according to the maximum voltage bearable by each element of the damping loop.
In one embodiment, the computer device obtains a first voltage comprising:
the computer equipment acquires a first quantity and the action voltage of the protection module; the first number is the number of thyristors in the bridge arm circuit for conducting the current conversion circuit; the action voltage is the voltage of the thyristor starting protection of the protection module.
The computer device determines the first voltage based on the first quantity and the action voltage.
In one embodiment, the second voltage comprises a maximum voltage generated during the line-crossing of the alternating current and the direct current; the computer device obtaining the second voltage, comprising:
the computer device obtains a first quantity, a direct current line voltage and an alternating current voltage; the first number is the number of thyristors in the bridge arm circuit for conducting the current conversion circuit; the alternating current voltage is the maximum voltage in the alternating current line when the direct current line crosses the alternating current line.
The computer device determines a maximum voltage generated during the AC/DC line strike based on the first quantity, the DC line voltage, and the AC voltage.
In one embodiment, the determining, by the computer device, a withstand voltage limit value of the thyristor when the current conversion circuit fails according to the first voltage and the second voltage includes:
the computer device determines a minimum value of the first voltage and the second voltage, and determines the minimum value as a withstand voltage limit value of the thyristor.
A computer device, comprising:
the acquisition module is used for acquiring a direct-current side bus voltage and an alternating-current side bus voltage of the converter valve; the direct-current side bus voltage is determined by the direct-current bus voltage and the direct-current neutral bus voltage; the voltage of the alternating-current side bus is determined by the three-phase voltage of the alternating-current bus.
The processing module is configured to conduct all bridge arm circuits of the converter valve when the dc-side bus voltage acquired by the acquisition module meets a first overvoltage condition and/or the ac-side bus voltage acquired by the acquisition module meets a second overvoltage condition.
A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
acquiring a first voltage and a second voltage; the first voltage is the maximum voltage of a protection module corresponding to the thyristor in a stable state, and the protection module is used for protecting the thyristor when the current conversion circuit generates high transient overvoltage; the second voltage is the voltage when the current conversion circuit fails;
and determining the withstand voltage limit value of the thyristor when the current conversion circuit fails according to the first voltage and the second voltage, wherein the withstand voltage limit value is used for ensuring that the thyristor is in a normal state when the current conversion circuit fails.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
the computer equipment acquires a first voltage and a second voltage; the first voltage is the maximum voltage of a protection module corresponding to the thyristor in a stable state, and the protection module is used for protecting the thyristor when the current conversion circuit generates high transient overvoltage; the second voltage is the voltage when the current conversion circuit fails;
and the computer equipment determines the withstand voltage limit value of the thyristor when the current conversion circuit fails according to the first voltage and the second voltage, wherein the withstand voltage limit value is used for ensuring that the thyristor is in a normal state when the current conversion circuit fails.
According to the method, the device and the storage medium for determining the withstand voltage value of the thyristor, the withstand voltage limit value of the thyristor when the current conversion circuit fails is determined by combining the acquired maximum voltage of the protection module corresponding to the thyristor in a stable state with the voltage of the current conversion circuit when the current conversion circuit fails; the method can provide a favorable basis for the replacement and the type selection of the thyristor in the direct current engineering so as to accurately identify the thyristor threatening the direct current operation and select a more proper thyristor to be applied to the direct current engineering. Therefore, the risk of direct current locking caused by unreasonable type selection or replacement of the thyristor is effectively avoided.
Drawings
Fig. 1 is an application environment diagram of a determination method of a withstand voltage value of a thyristor in one embodiment;
FIG. 2 is a schematic flow chart of a method for determining a withstand voltage of a thyristor according to an embodiment;
FIG. 3 is a second flowchart of the method for determining the withstand voltage of the thyristor according to one embodiment;
FIG. 4 is a block diagram of a computer device in one embodiment;
FIG. 5 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The method for determining the withstand voltage value of the thyristor can be applied to the application environment of the power system shown in fig. 1. The power system comprises a computer device 1 and a current conversion circuit 2; the current conversion circuit 2 includes a converter transformer 01, a converter valve 02, and a protection module 03. Wherein the converter valve 02 comprises at least one bridge arm circuit; the converter valve 02 shown with particular reference to fig. 1 comprises a six-leg circuit 021-. In addition, each bridge arm circuit comprises at least one thyristor. The at least one thyristor is connected in series. As shown in fig. 1, the bridge arm circuit 021 includes one or more thyristors 02 a; the bridge arm circuit 022 comprises one or more thyristors 02 b; the bridge arm circuit 023 comprises one or more thyristors 02 c; the bridge arm circuit 024 comprises one or more thyristors 02 d; the bridge arm circuit 025 comprises one or more thyristors 02 e; the bridge arm circuit 026 includes one or more thyristors 02 f. One end of the converter transformer 01 is connected with one end of a bridge arm circuit of the converter valve through an alternating current circuit, and the other end of the converter transformer 01 is connected with an alternating current bus 04 through an alternating current circuit; the other end of the bridge arm circuit is connected with a direct current bus. In addition, two ends of each thyristor are connected with a damping loop 06 in parallel; the damping circuit includes at least one element, and it should be noted that fig. 1 shows only the connection manner of the damping circuit 06 of one thyristor 02 a. The damping loops of the remaining thyristors are the same and are not shown in fig. 1. Two elements, a capacitor 061 and a resistor 062, are shown in fig. 1. The capacitor 061 and the resistor 062 are connected in series. Further, the protection module 03 is connected to the positive and negative ends of the direct current side of the converter valve 02.
The computer device 01 may be a terminal device or a server. When the computer device 01 is a terminal device, the terminal device may be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers, and portable wearable devices. When the computer device 01 is a server, the server may be implemented by a stand-alone server or a server cluster composed of a plurality of servers.
In one embodiment, as shown in fig. 2, a method for determining a withstand voltage of a thyristor is provided. The method comprises the following steps:
s11, the computer device obtains the first voltage and the second voltage.
The first voltage is the maximum voltage of the thyristor corresponding to the protection module in a stable state, and the protection module is used for protecting the thyristor when the current conversion circuit generates high transient overvoltage; the second voltage is a voltage when the current conversion circuit fails.
For example, the converter valve may be subjected to three types of overvoltage, i.e., operation overvoltage, lightning overvoltage and steep wave overvoltage in actual operation, and when the operation overvoltage is applied to two ends of the converter valve, the thyristor is subjected to all the overvoltage, which is the most serious condition for the converter valve. One of the equipment forms of the protection module is therefore an arrester.
Further, the protection module corresponding to the thyristor is at least used for protecting the thyristor. The method specifically comprises the following steps: a protection module for protecting only the thyristor; or the protection module is used for protecting the bridge arm circuit where the thyristor is located; or a protection module for protecting the converter valve in which the thyristor is located. When the protection module is only used for protecting the thyristor, the protection module is connected with the thyristor in parallel; when the protection module is used for protecting the bridge arm circuit where the thyristor is located, the protection module is connected with the bridge arm circuit in parallel; when the protection module is used for protecting the converter valve where the thyristor is located, the protection module is connected with the converter valve in parallel.
And S12, determining the withstand voltage limit value of the thyristor when the current conversion circuit fails according to the first voltage and the second voltage by the computer equipment.
The voltage-withstanding limit value is used for ensuring that the thyristor is in a normal state when the current conversion circuit fails.
In practical application, one way to determine the voltage limit of the thyristor is as follows: the maximum value of the first voltage and the second voltage is determined as the minimum withstand voltage value of the thyristor.
According to the method for determining the withstand voltage value of the thyristor, the withstand voltage limit value of the thyristor when the current conversion circuit fails is determined by combining the acquired maximum voltage of the protection module corresponding to the thyristor in a stable state with the voltage of the current conversion circuit when the current conversion circuit fails; the method can provide a favorable basis for the replacement and the type selection of the thyristor in the direct current engineering so as to accurately identify the thyristor threatening the direct current operation and select a more proper thyristor to be applied to the direct current engineering. Therefore, the risk of direct current locking caused by unreasonable type selection or replacement of the thyristor is effectively avoided.
In one embodiment, the current conversion circuit further comprises an ac line; a converter transformer is connected in the alternating current circuit; the second voltage comprises a maximum voltage generated during an ac line fault; referring to fig. 3, the computer device acquires a second voltage, including:
s111a, the computer equipment obtains the first quantity and the line voltage of the converter transformer.
The first number is the number of thyristors in the bridge arm circuit for conducting the current conversion circuit.
Optionally, the first number of obtaining manners includes: and acquiring the total quantity and the redundant quantity of the thyristors in the bridge arm circuit, and determining the total quantity and the redundant quantity of the thyristors in the bridge arm circuit as a first quantity.
S112a, the computer device determines a maximum voltage during the ac line fault based on the first quantity and the line voltage at the converter transformer side.
Optionally, the maximum voltage during the ac line fault is determined from 1/2 of the ratio of the line voltage on the converter transformer side to the first quantity.
Further, the maximum voltage during an ac line fault is determined according to the following equation
，
Wherein,
representing the ac voltage coefficient of change during an ac line fault;
representing the alternating voltage change coefficient during the steady state of the alternating current line;
representing the withstand voltage unbalance coefficient of the thyristor of the bridge arm circuit;
representing the line voltage on the converter transformer side;
representing the total number of thyristors in the bridge arm circuit;
representing the redundant number of thyristors in the bridge arm circuit.
In practical applications, the ac voltage variation coefficient during the ac line fault, and the voltage-withstanding imbalance coefficient of the bridge arm circuit thyristor in the above formulas are removed or added to the above formulas of the maximum voltage during the ac line fault according to actual use requirements. The embodiments of the present application do not limit this.
In this embodiment, in order to ensure normal operation of dc transmission, the maximum voltage during the ac line fault period is used as a factor for determining the withstand voltage limit of the thyristor when the current conversion circuit fails, so that the accuracy of the withstand voltage limit of the thyristor is improved.
In one embodiment, the current conversion circuit further comprises a direct current line; the second voltage comprises a maximum voltage generated during a dc line fault; referring to fig. 3, the computer device acquires a second voltage, including:
s111b, the computer device obtains the first number, the dc line voltage, and the number of converter valves in the current conversion circuit.
The first number is the number of thyristors in the bridge arm circuit for conducting the current conversion circuit.
It should be noted that, in the step, reference is made to the above-mentioned embodiment of S111a for determining the first quantity, which is not described herein and below.
In addition, the voltage of the direct current line can be collected through voltage collecting equipment, and the collected direct current line is sent to computer equipment through a wired or wireless mode through the voltage collecting equipment.
S112b, the computer device determines a maximum voltage generated during the dc fault based on the first number, the dc line voltage, and the number of converter valves in the current conversion circuit.
Illustratively, the number of converter valves in the current conversion circuit is determined by the voltage level of the current conversion circuit. For example, in the case of a high voltage level, the number of converter valves in the current conversion circuit is 2; in the case of a very high voltage class, the number of converter valves in the current conversion circuit is 4. Of course, the voltage class may also be extra high voltage.
Optionally, a product of the first number and the number of converter valves in the current conversion circuit is determined, and a ratio of the dc line voltage to the product is determined. Then, the maximum voltage generated during the dc fault is determined based on the ratio.
Further, the maximum voltage generated during the dc fault is calculated according to the following formula
：
Wherein,
representing the withstand voltage unbalance coefficient of the thyristor of the bridge arm circuit;
represents the dc line voltage;
representing the number of converter valves in the current conversion circuit;
representing the total number of thyristors in the bridge arm circuit;
representing the redundant number of thyristors in the bridge arm circuit.
In practical application, the voltage-withstanding unbalance coefficient of the bridge arm circuit thyristor in the above formula is removed or added in the above formula of the maximum voltage during the ac line fault according to practical use requirements. The embodiments of the present application do not limit this.
In this embodiment, in order to ensure normal operation of dc power transmission, the maximum voltage generated during a dc line fault is used as a factor for determining the withstand voltage limit of the thyristor when the current conversion circuit fails, so that the accuracy of the withstand voltage limit of the thyristor is improved.
In one embodiment, two ends of the thyristor are connected with a damping loop in parallel; the second voltage comprises a maximum voltage that the damping loop can withstand; referring to fig. 3, the computer device acquires a second voltage, including:
s111c, the computer device obtains the maximum voltage which can be borne by each element of the damping loop.
In practical application, the damping loop is connected in parallel with the thyristor and is used for attenuating high-frequency signals in the circuit and preventing the thyristor from being damaged by the high-frequency signals in the circuit. The element included in the damping loop may be one or more of a damping capacitor, a damping resistor, and a damping inductor. In the dc transmission engineering, a damping capacitor and a damping resistor are usually connected in series to form a damping loop.
And S112c, the computer equipment determines the maximum voltage bearable by the damping loop according to the maximum voltage bearable by each element of the damping loop.
Further, the minimum value of the maximum voltage that can be endured by all the elements in the damping loop is determined as the maximum voltage that can be endured by the damping loop.
In this embodiment, in order to ensure normal operation of dc transmission, the maximum voltage that can be borne by each element of the damping circuit is used as a factor for determining the withstand voltage limit of the thyristor when the current conversion circuit fails, so as to improve the accuracy of the withstand voltage limit of the thyristor.
In one embodiment, referring to fig. 3, a computer device obtains a first voltage comprising:
s111d, the computer device obtains the first number and the action voltage of the protection module.
The first quantity is the quantity of thyristors which are used for conducting the current conversion circuit in the bridge arm circuit; the action voltage is the voltage for protecting the thyristor starting by the protection module.
It should be noted that, for the description of this step, reference may be made to the above description of the embodiment at S11, and details are not described here.
S112d, the computer device determines a first voltage according to the first number and the action voltage.
Optionally, the first voltage is determined according to a ratio of the action voltage of the protection module to the first number.
Further, the first voltage is determined according to the following formula
：
Wherein,
representing the withstand voltage unbalance coefficient of the thyristor of the bridge arm circuit;
represents an operating voltage of the protection module;
representing the total number of thyristors in the bridge arm circuit;
representing the redundant number of thyristors in the bridge arm circuit.
In practical application, the voltage-withstanding unbalance coefficient of the bridge arm circuit thyristor in the above formula is removed or added in the above formula of the first voltage according to practical use requirements. The embodiments of the present application do not limit this.
In this embodiment, in order to ensure normal operation of dc power transmission, the maximum voltage of the protection module corresponding to the thyristor in the stable state is used as a factor for determining the withstand voltage limit of the thyristor when the current conversion circuit fails, so as to improve the accuracy of the withstand voltage limit of the thyristor.
In one embodiment, the second voltage comprises a maximum voltage generated during an ac/dc line strike; referring to fig. 3, the computer device acquires a second voltage, including:
s111e, the computer device obtains the first quantity, the DC line voltage, and the AC voltage.
The first quantity is the quantity of thyristors which are used for conducting the current conversion circuit in the bridge arm circuit; the ac voltage is the maximum voltage in the ac line when the dc line crosses the ac line.
And S112e, the computer equipment determines the maximum voltage generated during the line collision of the alternating current and the direct current according to the first quantity, the direct current line voltage and the alternating current voltage.
Optionally, the number of converter valves in the current conversion circuit is obtained, and the maximum voltage generated during the line-crossing period of the alternating current and the direct current is determined according to the first number, the voltage of the direct current line, the alternating current voltage and the number of converter valves in the current conversion circuit.
Further, the maximum voltage generated during the AC/DC line-touching period is calculated according to the following formula
：
Wherein,
represents the dc line voltage;
represents an alternating voltage;
representing the withstand voltage unbalance coefficient of the thyristor of the bridge arm circuit;
representing the number of converter valves in the current conversion circuit;
representing the total number of thyristors in the bridge arm circuit;
representing the redundant number of thyristors in the bridge arm circuit.
In practical application, the withstand voltage unbalance coefficient of the bridge arm circuit thyristor and the number of converter valves in the current conversion circuit in the formula are removed or added in the formula of the maximum voltage generated during the line collision of alternating current and direct current according to practical use requirements. The embodiments of the present application do not limit this.
In the embodiment, in order to guarantee the normal operation of direct-current power transmission, the maximum voltage generated during the line-touching period of alternating current and direct current is used as a factor for determining the withstand voltage limit value of the thyristor when the current conversion circuit fails, so that the accuracy of the withstand voltage limit value of the thyristor is improved.
In one embodiment, the computer device determines a withstand voltage limit of the thyristor when the current conversion circuit fails according to the first voltage and the second voltage, and includes: the computer device determines the minimum value of the first voltage and the second voltage, and determines the minimum value as the withstand voltage limit value of the thyristor.
Specifically, the second voltage includes one or more of a maximum voltage generated during an ac/dc line fault, a maximum voltage sustainable by the damping circuit, a maximum voltage generated during a dc line fault, and a maximum voltage generated during an ac line fault.
In this embodiment, the minimum value of the first voltage and the second voltage is determined as the voltage-withstanding limit value of the thyristor, so that the thyristor threatening the direct-current operation can be accurately identified, and a favorable basis is provided for the replacement and the model selection of the thyristor in the direct-current engineering. Therefore, the risk of direct current locking caused by unreasonable type selection or replacement of the thyristor is effectively avoided.
For better understanding, the overvoltage protection method provided by the embodiment of the application is exemplified. It is assumed that the damping loop includes two elements, a damping resistor and a damping capacitor.
Step 3, obtaining the voltage of the direct current line
=198.9kV, the maximum voltage during ac line fault was calculated according to the following equation
：
Step 4, obtaining the voltage of the direct current line
=500kV, the maximum withstand voltage of the thyristor during dc fault was calculated according to the following formula
：
Step 5, obtaining alternating voltage
=525kV, the maximum voltage generated during the ac/dc line-touching period is calculated according to the following equation
：
Step 6, obtaining the maximum voltage bearable by the damping resistor in the damping loop
=7kV and the maximum voltage that the damping capacitor can bear
=5.3kV, determining the maximum voltage that the damping circuit can bear
：
Step 7, comparison
、
、
、
、
Maximum value of withstand voltage limit of thyristor
：
It should be understood that although the steps in the flowcharts of fig. 2 and 3 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2 and 3 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps.
In one embodiment, as shown in fig. 4, there is provided a computer device 01 comprising: an acquisition module 011 and a processing module 012, wherein:
the acquisition module 011 is used for acquiring a first voltage and a second voltage; the first voltage is the maximum voltage of the thyristor corresponding to the protection module in a stable state, and the protection module is used for protecting the thyristor when the current conversion circuit generates high transient overvoltage; the second voltage is a voltage when the current conversion circuit fails.
And the processing module 012 is configured to determine, according to the first voltage and the second voltage acquired by the acquisition module 011, a withstand voltage limit of the thyristor when the current conversion circuit fails, where the withstand voltage limit is used to ensure that the thyristor is in a normal state when the current conversion circuit fails.
In one embodiment, the current conversion circuit further comprises an ac line; a converter transformer is connected in the alternating current circuit; the second voltage comprises a maximum voltage generated during an ac line fault.
The acquisition module 011 is specifically used for acquiring the first number and the line voltage of the converter transformer; the first number is the number of thyristors in the bridge arm circuit for conducting the current conversion circuit.
The processing module 012 is specifically configured to determine the maximum voltage during the ac line fault according to the first quantity acquired by the acquisition module 011 and the line voltage on the converter transformer side.
In one embodiment, the current conversion circuit further comprises a direct current line; the second voltage comprises a maximum voltage generated during a dc line fault.
The obtaining module 011 is specifically configured to obtain a first number, a dc line voltage, and a number of converter valves in the current conversion circuit; the first number is the number of thyristors in the bridge arm circuit for conducting the current conversion circuit.
The processing module 012 is specifically configured to determine the maximum voltage generated during the dc fault according to the first number, the dc line voltage, and the number of converter valves in the current conversion circuit, which are acquired by the acquiring module 011.
In one embodiment, two ends of the thyristor are connected with a damping loop in parallel; the second voltage comprises a maximum voltage that the damping loop can withstand.
The obtaining module 011 is specifically configured to obtain a maximum voltage that can be borne by each element of the damping loop.
The processing module 012 is specifically configured to determine the maximum voltage that can be borne by the damping circuit according to the maximum voltage that can be borne by each element of the damping circuit acquired by the acquisition module 011.
In one embodiment, the obtaining module 011 is specifically configured to obtain the first number and the operating voltage of the protection module; the first quantity is the quantity of thyristors which are used for conducting the current conversion circuit in the bridge arm circuit; the action voltage is the voltage for protecting the thyristor starting by the protection module.
The processing module 012 is specifically configured to determine the first voltage according to the first number and the operating voltage acquired by the acquisition module 011.
In one embodiment, the second voltage comprises a maximum voltage generated during a line-strike of the AC/DC power source.
The acquisition module 011 is specifically configured to acquire the first quantity, the dc line voltage, and the ac voltage; the first quantity is the quantity of thyristors which are used for conducting the current conversion circuit in the bridge arm circuit; the ac voltage is the maximum voltage in the ac line when the dc line crosses the ac line.
The processing module 012 is specifically configured to determine the maximum voltage generated during the ac/dc line-touching period according to the first quantity, the dc line voltage, and the ac voltage acquired by the acquisition module 011.
In one embodiment, the processing module 012 is specifically configured to determine a minimum value of the first voltage and the second voltage, and determine the minimum value as a voltage endurance limit of the thyristor.
For specific definition of the computer device, reference may be made to the above definition of the determination method of the thyristor withstand voltage value, and details are not described here. The various modules in the computer device described above may be implemented in whole or in part by software, hardware, and combinations thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a server, the internal structure of which may be as shown in fig. 5. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used for storing the acquired direct current bus voltage, direct current neutral bus voltage and alternating current bus three-phase voltage. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to realize a method for determining the withstand voltage value of the thyristor.
Those skilled in the art will appreciate that the architecture shown in fig. 5 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
the computer equipment acquires a first voltage and a second voltage; the first voltage is the maximum voltage of the thyristor corresponding to the protection module in a stable state, and the protection module is used for protecting the thyristor when the current conversion circuit generates high transient overvoltage; the second voltage is a voltage when the current conversion circuit fails.
And the computer equipment determines the withstand voltage limit value of the thyristor when the current conversion circuit fails according to the first voltage and the second voltage, wherein the withstand voltage limit value is used for ensuring that the thyristor is in a normal state when the current conversion circuit fails.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
the current conversion circuit further comprises an alternating current circuit; a converter transformer is connected in the alternating current circuit; the second voltage comprises a maximum voltage generated during an ac line fault; the computer device obtains a second voltage, comprising:
the method comprises the steps that computer equipment obtains a first number and line voltage of a converter transformer; the first number is the number of thyristors in the bridge arm circuit for conducting the current conversion circuit.
The computer device determines a maximum voltage during the ac line fault based on the first quantity and the line voltage at the converter transformer side.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
the current conversion circuit also comprises a direct current line; the second voltage comprises a maximum voltage generated during a dc line fault; the computer device obtains a second voltage, comprising:
the computer equipment acquires the first number, the voltage of the direct current line and the number of converter valves in the current conversion circuit; the first number is the number of thyristors in the bridge arm circuit for conducting the current conversion circuit.
The computer device determines a maximum voltage generated during the dc fault based on the first number, the dc line voltage, and the number of converter valves in the current conversion circuit.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
two ends of the thyristor are connected in parallel with a damping loop; the second voltage comprises a maximum voltage that the damping loop can withstand; the computer device obtains a second voltage, comprising:
and the computer equipment acquires the maximum voltage which can be borne by each element of the damping loop.
And the computer equipment determines the maximum voltage bearable by the damping loop according to the maximum voltage bearable by each element of the damping loop.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
the computer device obtains a first voltage, comprising:
the computer equipment acquires the first quantity and the action voltage of the protection module; the first quantity is the quantity of thyristors which are used for conducting the current conversion circuit in the bridge arm circuit; the action voltage is the voltage for protecting the thyristor starting by the protection module.
The computer device determines a first voltage based on the first quantity and the actuation voltage.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
the second voltage comprises the maximum voltage generated in the line-touching period of the alternating current and the direct current; the computer device obtains a second voltage, comprising:
the computer equipment acquires a first quantity, a direct current line voltage and an alternating current voltage; the first quantity is the quantity of thyristors which are used for conducting the current conversion circuit in the bridge arm circuit; the ac voltage is the maximum voltage in the ac line when the dc line crosses the ac line.
The computer device determines a maximum voltage generated during the AC/DC line strike based on the first quantity, the DC line voltage, and the AC voltage.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
the computer equipment determines the withstand voltage limit value of the thyristor when the current conversion circuit fails according to the first voltage and the second voltage, and comprises the following steps:
the computer device determines the minimum value of the first voltage and the second voltage, and determines the minimum value as the withstand voltage limit value of the thyristor.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
acquiring a first voltage and a second voltage; the first voltage is the maximum voltage of a protection module corresponding to the thyristor in a stable state, and the protection module is used for protecting the thyristor when the current conversion circuit generates high transient overvoltage; the second voltage is a voltage when the current conversion circuit is in a fault.
And determining a withstand voltage limit value of the thyristor when the current conversion circuit fails according to the first voltage and the second voltage, wherein the withstand voltage limit value is used for ensuring that the thyristor is in a normal state when the current conversion circuit fails.
In one embodiment, the computer program when executed by the processor further performs the steps of: the current conversion circuit further comprises an alternating current line; a converter transformer is connected in the alternating current circuit; the second voltage comprises a maximum voltage generated during an ac line fault; the obtaining the second voltage includes:
the first number and the line voltage of the converter transformer are obtained; the first number is the number of thyristors in the bridge arm circuit for conducting the current conversion circuit.
And determining the maximum voltage during the fault period of the alternating current line according to the first quantity and the line voltage of the converter transformer side.
In one embodiment, the computer program when executed by the processor further performs the steps of: the current conversion circuit further comprises a direct current line; the second voltage comprises a maximum voltage generated during a dc line fault; the obtaining the second voltage includes:
the first number, the direct current line voltage and the number of converter valves in the current conversion circuit are obtained; the first number is the number of thyristors in the bridge arm circuit for conducting the current conversion circuit.
And determining the maximum voltage generated during the direct current fault according to the first number, the direct current line voltage and the number of converter valves in the current conversion circuit. The first number is the number of thyristors in the bridge arm circuit for conducting the current conversion circuit.
In one embodiment, the computer program when executed by the processor further performs the steps of: two ends of the thyristor are connected with a damping loop in parallel; the second voltage comprises a maximum voltage that the damping loop can withstand; the obtaining the second voltage includes:
and acquiring the maximum voltage which can be borne by each element of the damping loop.
And determining the maximum voltage which can be borne by the damping loop according to the maximum voltage which can be borne by each element of the damping loop.
In one embodiment, the computer program when executed by the processor further performs the steps of: the obtaining a first voltage includes:
the first quantity and the action voltage of the protection module are obtained; the first number is the number of thyristors in the bridge arm circuit for conducting the current conversion circuit; the action voltage is the voltage of the thyristor starting protection of the protection module.
And determining the first voltage according to the first quantity and the action voltage.
In one embodiment, the computer program when executed by the processor further performs the steps of: the second voltage comprises the maximum voltage generated in the line-touching period of the alternating current and the direct current; the obtaining the second voltage includes:
the first quantity, the direct current line voltage and the alternating current voltage are obtained; the first number is the number of thyristors in the bridge arm circuit for conducting the current conversion circuit; the alternating current voltage is the maximum voltage in the alternating current line when the direct current line crosses the alternating current line.
And determining the maximum voltage generated during the line collision of the alternating current and the direct current according to the first number, the direct current line voltage and the alternating current voltage.
In one embodiment, the computer program when executed by the processor further performs the steps of: the determining the withstand voltage limit value of the thyristor when the current conversion circuit fails according to the first voltage and the second voltage includes:
and determining the minimum value of the first voltage and the second voltage, and determining the minimum value as the withstand voltage limit value of the thyristor.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for determining the withstand voltage value of a thyristor is characterized by being applied to a power system; the power system comprises computer equipment and a current conversion circuit; the current conversion circuit comprises a converter valve, the converter valve is used for converting a current signal at an input end of the current conversion circuit into alternating current and direct current, the converter valve comprises a bridge arm circuit, the bridge arm circuit comprises at least one thyristor, and the method comprises the following steps:
the computer equipment acquires a first voltage and a second voltage; the first voltage is the maximum voltage of a protection module corresponding to the thyristor in a stable state, and the protection module is used for protecting the thyristor when the current conversion circuit generates high transient overvoltage; the second voltage is the voltage when the current conversion circuit fails;
and the computer equipment determines the withstand voltage limit value of the thyristor when the current conversion circuit fails according to the first voltage and the second voltage, wherein the withstand voltage limit value is used for ensuring that the thyristor is in a normal state when the current conversion circuit fails.
2. The method for determining the withstand voltage value of a thyristor according to claim 1, wherein the current conversion circuit further comprises an ac line; a converter transformer is connected in the alternating current circuit; the second voltage comprises a maximum voltage generated during an ac line fault; the computer device obtaining the second voltage, comprising:
the computer equipment acquires a first quantity and the line voltage of the converter transformer; the first number is the number of thyristors in the bridge arm circuit for conducting the current conversion circuit;
and the computer equipment determines the maximum voltage during the fault period of the alternating current line according to the first quantity and the line voltage of the converter transformer side.
3. The method for determining the withstand voltage value of a thyristor according to claim 1, wherein the current conversion circuit further comprises a direct current line; the second voltage comprises a maximum voltage generated during a dc line fault; the computer device obtaining the second voltage, comprising:
the computer equipment acquires a first number, direct current line voltage and the number of converter valves in the current conversion circuit; the first number is the number of thyristors in the bridge arm circuit for conducting the current conversion circuit;
the computer device determines a maximum voltage generated during the DC fault based on the first number, the DC link voltage, and a number of converter valves in the current conversion circuit.
4. The method for determining the withstand voltage value of the thyristor according to claim 1, wherein a damping loop is connected in parallel to both ends of the thyristor; the second voltage comprises a maximum voltage that the damping loop can withstand; the computer device obtaining the second voltage, comprising:
the computer equipment acquires the maximum voltage which can be borne by each element of the damping loop;
and the computer equipment determines the maximum voltage bearable by the damping loop according to the maximum voltage bearable by each element of the damping loop.
5. The method for determining the withstand voltage value of a thyristor according to any one of claims 1 to 3, wherein the computer device obtains the first voltage by:
the computer equipment acquires a first quantity and the action voltage of the protection module; the first number is the number of thyristors in the bridge arm circuit for conducting the current conversion circuit; the action voltage is the voltage for the thyristor starting protection of the protection module;
the computer device determines the first voltage based on the first quantity and the action voltage.
6. A method for determining a withstand voltage of a thyristor according to any one of claims 1 to 3, wherein the second voltage comprises a maximum voltage generated during a line-crossing of ac and dc; the computer device obtaining the second voltage, comprising:
the computer device obtains a first quantity, a direct current line voltage and an alternating current voltage; the first number is the number of thyristors in the bridge arm circuit for conducting the current conversion circuit; the alternating current voltage is the maximum voltage in the alternating current circuit when the direct current circuit crosses the alternating current circuit;
the computer device determines a maximum voltage generated during the AC/DC line strike based on the first quantity, the DC line voltage, and the AC voltage.
7. A method for determining a withstand voltage value of a thyristor according to any one of claims 1-3, wherein the determining, by the computer device, a withstand voltage limit value of the thyristor in the event of a failure of the current conversion circuit based on the first voltage and the second voltage comprises:
the computer device determines a minimum value of the first voltage and the second voltage, and determines the minimum value as a withstand voltage limit value of the thyristor.
8. A computer device, comprising:
the acquisition module is used for acquiring a first voltage and a second voltage; the first voltage is the maximum voltage of a protection module corresponding to the thyristor in a stable state, and the protection module is used for protecting the thyristor when a high transient overvoltage occurs in the current conversion circuit; the second voltage is the voltage when the current conversion circuit fails;
and the processing module is used for determining a withstand voltage limit value of the thyristor when the current conversion circuit fails according to the first voltage and the second voltage acquired by the acquisition module, wherein the withstand voltage limit value is used for ensuring that the thyristor is in a normal state when the current conversion circuit fails.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
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