CN114252764A - Method, device, equipment and medium for checking current breaking capacity of circuit breaker - Google Patents
Method, device, equipment and medium for checking current breaking capacity of circuit breaker Download PDFInfo
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Abstract
The invention provides a method, a device, equipment and a medium for checking the breaking capacity of a circuit breaker, wherein the method comprises the steps of obtaining a preset electromagnetic transient model of a double-fed wind turbine generator, and constructing a fault test system according to the preset electromagnetic transient model; acquiring a current-voltage characteristic curve under the condition of short-circuit fault based on the fault test system; calculating to obtain the short-circuit current effective value of the double-fed wind turbine generator according to the current-voltage characteristic curve; and checking the current breaking capacity of the circuit breaker according to the effective value of the short-circuit current. By adopting the embodiment of the invention, when the double-fed wind turbine generator exists in the network, the influence of the double-fed wind turbine generator is considered when the short-circuit current is calculated, so that the accuracy of the calculation result of the actual current value of the short-circuit point is improved, and the current breaking capacity of the circuit breaker is more accurately verified.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a method, a device, equipment and a medium for verifying the current breaking capacity of a circuit breaker.
Background
In the design and operation process of a power system and electrical equipment, calculating an effective value of short-circuit current at a specified moment to verify the current breaking capacity of a circuit breaker is the main content of short-circuit analysis of a modern large-scale alternating current and direct current power system. Among them, the short circuit calculation is an indispensable basic calculation for solving a series of technical problems.
Currently, the common short circuit current calculation methods consider the synchronous generator, the transmission network and the load, wherein the synchronous generator is considered as a parallel combination of a constant current source and an admittance, the transmission network is considered as a combination of a resistance and a reactance, and the load is considered as a ground branch and represented by a constant impedance. However, the inventor of the present invention finds, in a study on the prior art, that the short-circuit current calculation method is only applicable to a situation where only a generator, a transmission line, a transformer and a load exist in a network, and if a doubly-fed wind turbine generator also exists in the network, since the doubly-fed wind turbine generator injects current into the system even when the network is short-circuited, the calculation method for the short-circuit current is not applicable any more.
Disclosure of Invention
The invention provides a method, a device, equipment and a medium for checking the breaking capacity of a circuit breaker, which can consider the influence of a double-fed wind turbine generator set when calculating the short-circuit current, thereby improving the accuracy of the calculation result of the actual current value of a short-circuit point.
In order to achieve the above object, an embodiment of the present invention provides a method for verifying a circuit breaking capability of a circuit breaker, including the following steps:
acquiring a preset electromagnetic transient model of the doubly-fed wind turbine generator, and constructing a fault test system according to the preset electromagnetic transient model;
acquiring a current-voltage characteristic curve under the condition of short-circuit fault based on the fault test system;
calculating to obtain the short-circuit current effective value of the double-fed wind turbine generator according to the current-voltage characteristic curve;
and checking the current breaking capacity of the circuit breaker according to the effective value of the short-circuit current.
As an optional embodiment, the obtaining a current-voltage characteristic curve in the case of short-circuit fault based on the fault testing system includes:
adjusting the size of a transition resistor of the fault testing system to simulate the condition of short-circuit fault and obtain simulation data corresponding to different voltage drop degrees;
and obtaining a current-voltage characteristic curve under the condition of short-circuit fault according to the simulation data.
As an optional embodiment, the calculating the short-circuit current effective value of the doubly-fed wind turbine generator according to the current-voltage characteristic curve includes:
obtaining critical voltage values corresponding to different critical voltage points according to the current-voltage characteristic curve;
calculating an actual voltage value of a bus where the doubly-fed wind turbine generator is located when a short-circuit fault occurs at a preset fault point based on the fault test system;
and calculating the short-circuit current effective value of the double-fed wind turbine generator according to the magnitude relation between the critical voltage values corresponding to different critical voltage points and the actual voltage value.
As an optional embodiment, the calculating, based on the fault testing system, an actual voltage value of a bus where the doubly-fed wind turbine generator is located when a short-circuit fault occurs at a preset fault point includes:
acquiring fault current at a preset fault point based on the fault test system;
and calculating the actual voltage value of the bus where the doubly-fed wind turbine generator is located according to the fault current.
As an optional embodiment, the formula for calculating the actual voltage value of the bus where the doubly-fed wind turbine generator is located according to the fault current is as follows:
wherein the content of the first and second substances,
the actual voltage value of the bus where the doubly-fed wind turbine generator is located,
for presetting the normal voltage of the fault point f before the occurrence of a short-circuit fault, ZkfIs the impedance between node k and fault point f, ifTo preset fault pointsf fault current.
As an optional embodiment, the verifying the current breaking capability of the circuit breaker according to the effective value of the short-circuit current includes:
acquiring the on-off current of the circuit breaker;
and obtaining a checking result of the current breaking capacity of the circuit breaker according to the magnitude relation between the effective short-circuit current value and the breaking current of the circuit breaker.
As an optional embodiment, the obtaining, according to a magnitude relationship between the effective value of the short-circuit current and the breaking current of the circuit breaker, a result of verifying the breaking capability of the circuit breaker includes:
when the effective value of the short-circuit current is larger than the on-off current of the circuit breaker, judging that the current breaking capacity of the circuit breaker does not meet the working requirement;
and when the effective value of the short-circuit current is smaller than the on-off current of the circuit breaker, judging that the current breaking capacity of the circuit breaker meets the working requirement.
Another embodiment of the present invention correspondingly provides a device for checking the breaking capacity of a circuit breaker, including:
the fault testing system building module is used for obtaining a preset electromagnetic transient model of the double-fed wind turbine generator and building a fault testing system according to the preset electromagnetic transient model;
the fault characteristic curve acquisition module is used for acquiring a current-voltage characteristic curve under the condition of short-circuit fault based on the fault test system;
the short-circuit current effective value calculating module is used for calculating the short-circuit current effective value of the double-fed wind turbine generator according to the current-voltage characteristic curve;
and the circuit breaker breaking capacity verifying module is used for verifying the breaking capacity of the circuit breaker according to the effective value of the short-circuit current.
Another embodiment of the present invention correspondingly provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the processor implements the method for verifying the breaking capability of the circuit breaker according to the embodiment of the present invention.
Another embodiment of the present invention provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, where when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the method for verifying the breaking capacity of the circuit breaker according to the above-described embodiment of the present invention.
Compared with the prior art, the method, the device, the equipment and the medium for checking the current breaking capacity of the circuit breaker provided by the embodiment of the invention can consider the influence of the double-fed wind turbine generator when the double-fed wind turbine generator exists in a network and short-circuit current is calculated, so that the accuracy of the calculation result of the actual current value of the short-circuit point is improved, and the current breaking capacity of the circuit breaker is checked more accurately.
Drawings
Fig. 1 is a schematic flowchart of a method for verifying the breaking capacity of a circuit breaker according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a node f in a short-circuit fault in the prior art;
fig. 3 is a schematic structural diagram of a double-fed wind turbine generator testing system provided by an embodiment of the present invention;
FIG. 4 is an I-U curve diagram of a doubly-fed wind turbine generator provided by an embodiment of the present invention
Fig. 5 is a schematic structural diagram of a device for verifying the breaking capacity of a circuit breaker according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a schematic flowchart of a method for verifying a breaking capability of a circuit breaker according to an embodiment of the present invention is shown, where the method includes steps S11 to S14:
s11, obtaining a preset electromagnetic transient model of the doubly-fed wind turbine generator, and constructing a fault test system according to the preset electromagnetic transient model.
And S12, acquiring a current-voltage characteristic curve under the condition of short-circuit fault based on the fault test system.
And S13, calculating the short-circuit current effective value of the double-fed wind turbine generator according to the current-voltage characteristic curve.
And S14, verifying the current breaking capacity of the circuit breaker according to the effective value of the short-circuit current.
As is known, in the design and operation of electrical systems and electrical equipment, short circuit calculation is one of the essential basic calculations necessary to solve a series of technical problems, one of the main problems being to select electrical equipment with sufficient mechanical and thermal stability, such as circuit breakers, transformers, insulators, busbars, cables, etc., on which the short circuit calculation must be based. This includes calculating the inrush current to verify the electrodynamic stability of the device; calculating short-circuit current periodic components at a plurality of moments to verify the thermal stability of the equipment; and calculating the effective value of the short-circuit current at the specified moment to verify the current breaking capacity of the circuit breaker and the like.
Further, in the prior art, a common short-circuit current calculation method considers a synchronous generator, a transmission network and a load, wherein the synchronous generator is considered as a parallel combination of a constant current source and an admittance, the transmission network is considered as a combination of a resistance and a reactance, and the load is considered as a ground branch and represented by a constant impedance. The node impedance matrix of the power system may be represented as:
V＝zI (1)
wherein: z is a matrix of the node impedances,
v is the node voltage column vector，
I is the node injection current column vector,
referring to fig. 2, assume that node f in the system passes through transition resistance ZfThree-phase short circuit occurs, the boundary condition of the fault position is kept unchanged, and the original part of the network is separated from the fault branch. As can be seen from fig. 2, the occurrence of a short circuit corresponds to an increase of an injection current i at the fault node ffTherefore, the voltage at any node i in the network can be expressed as:
wherein: viIs any node voltage after the fault; zij、ZifIs a node impedance matrix element; i isjThe injection current at node j. Equation (2) applies to the failed node f, then:
in the formula:
is the normal voltage of the fault point before the short circuit; zffIs the self-impedance of the fault point f. In equation (3) there are two unknowns Vf、ifFrom the fault boundary conditions for the fault point in fig. 2, the following equations can be listed:
Vf+zfif＝0 (4)
according to the equations (3) and (4), the short-circuit current i at the fault point f can be determinedf：
The short-circuit current i of the fault point f is determined according to the formula (5)fThen, substituting the formula (2) to obtain the voltage V of any node in the networki。
However, the short-circuit current calculation method is only suitable for the situation that only a generator, a transmission line, a transformer and a load exist in a network, if a double-fed wind turbine generator exists in the network, the double-fed wind turbine generator can inject current into the system under the situation that the network is short-circuited, and the method has a certain current source characteristic, and at the moment, the calculation method is not suitable any more, and a new short-circuit current calculation method considering the double-fed wind turbine generator needs to be provided.
Compared with the prior art, the method for checking the current breaking capacity of the circuit breaker provided by the embodiment of the invention can consider the influence of the double-fed wind turbine generator when the double-fed wind turbine generator exists in a network and short-circuit current is calculated, so that the accuracy of the calculation result of the actual current value of the short-circuit point is improved, and the current breaking capacity of the circuit breaker is checked more accurately.
As an alternative embodiment, the step S12 includes:
s121, adjusting the size of the transition resistor of the fault test system to simulate the condition of short-circuit fault and obtain simulation data corresponding to different voltage drop degrees;
and S122, obtaining a current-voltage characteristic curve under the condition of short-circuit fault according to the simulation data.
For example, refer to fig. 3, which is a schematic structural diagram of a test system for obtaining an I-U curve built according to an electromagnetic transient model of a doubly-fed wind turbine generator of a wind power plant. The grid-connected point of the wind turbine generator is grounded through the transition resistor R, and simulation data of different voltage drop degrees, including the voltage amplitude U and angle of the grid-connected point, can be obtained by adjusting the size of the transition resistor R in simulation
Injection system current amplitude I and angle
According to the depth of the dropping voltage, an I-U curve graph shown in FIG. 4 can be drawn, a grid-connected point voltage amplitude U and an injection system current amplitude I are drawn in FIG. 4(a), the drawn points are connected to obtain a simulation data I-U curve, and a theoretical I-U curve is drawn according to the simulation data I-U curve, wherein the sections a-b are oblique lines with fixed slopes, the sections b-c are straight lines parallel to the abscissa, and the sections c-d are also straight lines parallel to the abscissa; in FIG. 4(b) the sections a-b depict when the voltage amplitude is U
Sections b-c and c-c depict the voltage amplitude at U
And (3) connecting the points described above to obtain a simulation data curve, and drawing a theoretical curve according to the simulation data curve, wherein the sections a-b, b-c and c-d are straight lines parallel to the abscissa, and only the numerical values are different.
As an alternative embodiment, the step S13 includes:
s131, obtaining critical voltage values corresponding to different critical voltage points according to the current-voltage characteristic curve;
s132, calculating an actual voltage value of a bus where the doubly-fed wind turbine generator is located when a short-circuit fault occurs at a preset fault point based on the fault test system;
and S133, calculating the short-circuit current effective value of the doubly-fed wind turbine generator according to the magnitude relation between the critical voltage values corresponding to different critical voltage points and the actual voltage value.
Illustratively, according to a theoretical I-U curve of a common doubly-fed wind turbine generator, the critical voltage U can be determineda、Ub、Uc、Ud. Specifically, due to different off-grid voltages of different types of doubly-fed wind turbine generators, the value of the off-grid voltage is equal to the critical voltage UaGenerally, 0.2 is taken; u shapebIs a voltage value of a horizontal axis corresponding to the intersection point of the sections a-b and b-c; u shapecIs an intersection pair of segments b-c and c-dThe corresponding horizontal axis voltage value; in the practical application process, the corresponding critical voltage value U can be obtained according to the I-U curveb、Uc(ii) a The maximum voltage that different types of double-fed wind turbine generators can bear is different and equal to the critical voltage Ud。
Further, illustratively, the short-circuit current of the doubly-fed wind turbine generator can be calculated and considered according to an I-U curve of the doubly-fed wind turbine generator, and the specific calculation steps are as follows:
(1) before the short-circuit fault occurs, the doubly-fed wind turbine generator model is a constant current source ikAt this time, the node impedance equation of the network is formula (6), and the difference between formula (6) and formula (1) is that the injection system current vector I contains the injection system current I of the doubly-fed wind turbine generatork。
V＝ZI (6)
In the formula: v is a column vector of the node voltages,
z is a connecting impedance matrix and does not contain the equivalent impedance of the doubly-fed wind turbine generator,
i is a node injection current column vector which contains the injection current of the doubly-fed wind generator set,
(2) when a transition of impedance z occurs at fault point ffWhen the three-phase short circuit fault occurs, firstly, the doubly-fed wind turbine generator model is considered as a constant current source ikIn the case of (2), the fault current at the fault point f is calculated
In the formula:
as an alternative embodiment, the step S132 includes:
s1321, acquiring fault current at a preset fault point based on the fault test system;
and S1322, calculating an actual voltage value of a bus where the doubly-fed wind turbine generator is located according to the fault current.
As an optional embodiment, the formula for calculating the actual voltage value of the bus where the doubly-fed wind turbine generator is located according to the fault current is as follows:
wherein the content of the first and second substances,
the actual voltage value of the bus where the doubly-fed wind turbine generator is located,
for presetting the normal voltage of the fault point f before the occurrence of a short-circuit fault, ZkfIs the impedance between node k and fault point f, ifIs the fault current at the preset fault point f.
As an optional embodiment, the verifying the current breaking capability of the circuit breaker according to the effective value of the short-circuit current includes:
acquiring the on-off current of the circuit breaker;
and obtaining a checking result of the current breaking capacity of the circuit breaker according to the magnitude relation between the effective short-circuit current value and the breaking current of the circuit breaker.
As an optional embodiment, the obtaining, according to a magnitude relationship between the effective value of the short-circuit current and the breaking current of the circuit breaker, a result of verifying the breaking capability of the circuit breaker includes:
when the effective value of the short-circuit current is larger than the on-off current of the circuit breaker, judging that the current breaking capacity of the circuit breaker does not meet the working requirement;
and when the effective value of the short-circuit current is smaller than the on-off current of the circuit breaker, judging that the current breaking capacity of the circuit breaker meets the working requirement.
The following are exemplary:
(1) according to the obtained
And judging the position of the doubly-fed wind turbine generator in the I-U curve, and respectively carrying out calculation according to different characteristics of the sections 0-a, a-b, b-c and c-d.
A. If it is
In the section 0-a of the I-U curve, the fan is off-line, the doubly-fed wind power generation model is not considered, namely I is removed from the current column vector I of the injection system in the formula (6)kTo obtain I(1)，
Recalculating the fault current according to equation (7)
And after the fault current is obtained, the voltage of any other node can be calculated, and the calculation is finished.
B. If it is
In the section a-b of the I-U curve, Crowbar investment and the doubly-fed wind turbine model are equivalent impedance zkThe amplitude is the reciprocal of the slope of the section a-b of the I-U curve,
Will zkThe node impedance matrix Z is incorporated into a node impedance matrix Z to obtain a new node impedance matrix containing the doubly-fed wind turbine generator model
The doubly-fed wind turbine generator model is no longer a current source, so that the current column vector of the injection system is I(1). According to the changed node impedance matrix Z' and the injection current column vector I(1)Recalculating the fault point current according to equation (7)
To obtain
Then, the voltage of any node can be calculated, and the calculation is finished.
C. If it is
In the b-c section of the I-U curve and the excitation regulation control stage, the doubly-fed wind turbine generator model is a constant current source Ik′，ik' the amplitude is the current value I in the section b-c of the I-U curve of FIG. 4(a)b，ikThe angle of' is the value of the section b-c in FIG. 4 (b).
Equivalent to increasing the fault current i of an injection system on a bus where the doubly-fed wind turbine generator is locatedk′-ikCorrecting the fault current at the fault point f
Obtaining fault current
Then, the voltage of any node can be calculated, and the calculation is finished.
D. If it is
In the c-d section of the I-U curve and the outer ring control stage, the doubly-fed wind turbine model is a constant current source at the momentNormally rated current, i.e. substantially identical to the non-faulted case, without special treatment, the fault current being calculated by equation (7)
From this fault current, the voltage at either node can be calculated, and the calculation ends.
As an optional embodiment, the step S14 specifically includes:
comparing the calculated short-circuit current effective value with the on-off current of the circuit breaker, and if the short-circuit current effective value is larger than the on-off current of the circuit breaker, the circuit breaker does not meet the requirement, and a method for limiting the short-circuit current or the circuit breaker with larger on-off current needs to be researched; and if the effective value of the short-circuit current is smaller than the breaking current of the breaker, the breaker meets the requirement.
Referring to fig. 5, a schematic structural diagram of a device for verifying the breaking capability of a circuit breaker according to an embodiment of the present invention is shown, including:
the fault testing system constructing module 51 is configured to acquire a preset electromagnetic transient model of the doubly-fed wind turbine generator, and construct a fault testing system according to the preset electromagnetic transient model;
a fault characteristic curve obtaining module 52, configured to obtain a current-voltage characteristic curve under a short-circuit fault condition based on the fault testing system;
the short-circuit current effective value calculating module 53 is configured to calculate a short-circuit current effective value of the doubly-fed wind turbine generator according to the current-voltage characteristic curve;
and the circuit breaker breaking capacity verifying module 54 is used for verifying the breaking capacity of the circuit breaker according to the effective value of the short-circuit current.
Compared with the prior art, the device for checking the current breaking capacity of the circuit breaker provided by the embodiment of the invention can consider the influence of the double-fed wind turbine generator when the double-fed wind turbine generator exists in a network and short-circuit current is calculated, so that the accuracy of the calculation result of the actual current value of the short-circuit point is improved, and the current breaking capacity of the circuit breaker is checked more accurately.
As an optional embodiment, the fault characteristic curve obtaining module 52 is specifically configured to:
adjusting the size of a transition resistor of the fault testing system to simulate the condition of short-circuit fault and obtain simulation data corresponding to different voltage drop degrees;
and obtaining a current-voltage characteristic curve under the condition of short-circuit fault according to the simulation data.
As an optional embodiment, the short-circuit current effective value calculating module 53 is specifically configured to:
obtaining critical voltage values corresponding to different critical voltage points according to the current-voltage characteristic curve;
calculating an actual voltage value of a bus where the doubly-fed wind turbine generator is located when a short-circuit fault occurs at a preset fault point based on the fault test system;
and calculating the short-circuit current effective value of the double-fed wind turbine generator according to the magnitude relation between the critical voltage values corresponding to different critical voltage points and the actual voltage value.
As an optional embodiment, the calculating, based on the fault testing system, an actual voltage value of a bus where the doubly-fed wind turbine generator is located when a short-circuit fault occurs at a preset fault point includes:
acquiring fault current at a preset fault point based on the fault test system;
and calculating the actual voltage value of the bus where the doubly-fed wind turbine generator is located according to the fault current.
As an optional embodiment, the formula for calculating the actual voltage value of the bus where the doubly-fed wind turbine generator is located according to the fault current is as follows:
wherein the content of the first and second substances,
the actual voltage value of the bus where the doubly-fed wind turbine generator is located,
for presetting the normal voltage of the fault point f before the occurrence of a short-circuit fault, ZkfIs the impedance between node k and fault point f, ifIs the fault current at the preset fault point f.
As an optional embodiment, the verifying the current breaking capability of the circuit breaker according to the effective value of the short-circuit current includes:
acquiring the on-off current of the circuit breaker;
and obtaining a checking result of the current breaking capacity of the circuit breaker according to the magnitude relation between the effective short-circuit current value and the breaking current of the circuit breaker.
As an optional embodiment, the obtaining, according to a magnitude relationship between the effective value of the short-circuit current and the breaking current of the circuit breaker, a result of verifying the breaking capability of the circuit breaker includes:
when the effective value of the short-circuit current is larger than the on-off current of the circuit breaker, judging that the current breaking capacity of the circuit breaker does not meet the working requirement;
and when the effective value of the short-circuit current is smaller than the on-off current of the circuit breaker, judging that the current breaking capacity of the circuit breaker meets the working requirement.
It should be noted that the fact that the effective value of the short-circuit current is equal to the open-circuit current is not sufficient for the operation.
As an optional embodiment, the circuit breaker breaking capability verification module 54 is specifically configured to:
comparing the calculated short-circuit current effective value with the on-off current of the circuit breaker, and if the short-circuit current effective value is larger than the on-off current of the circuit breaker, the circuit breaker does not meet the requirement, and a method for limiting the short-circuit current or the circuit breaker with larger on-off current needs to be researched; and if the effective value of the short-circuit current is smaller than the breaking current of the breaker, the breaker meets the requirement.
In addition, it should be noted that for the specific description and the beneficial effects of each embodiment of the apparatus for verifying the circuit breaking capability of the circuit breaker in this embodiment, reference may be made to the specific description and the beneficial effects of each embodiment of the method for verifying the circuit breaking capability of the circuit breaker, which are not described herein again.
Fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present invention. The terminal device 6 of this embodiment includes: a processor 60, a memory 61 and a computer program stored in said memory 61 and executable on said processor 60. The processor 60, when executing the computer program, implements the steps in the above-described embodiments of the method for controlling the vehicle-mounted atmosphere lamp. Alternatively, the processor 60 implements the functions of the modules in the above device embodiments when executing the computer program.
Illustratively, the computer program may be divided into one or more modules, which are stored in the memory 61 and executed by the processor 60 to accomplish the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program in the terminal device 6.
The terminal device 6 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device 6 may include, but is not limited to, a processor 60, a memory 61. It will be appreciated by those skilled in the art that the schematic diagram is merely an example of a terminal device and does not constitute a limitation of a terminal device, and may include more or less components than those shown, or combine some components, or different components, for example, the terminal device 6 may further include an input-output device, a network access device, a bus, etc.
The Processor 60 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, and the processor 60 is the control center of the terminal device 6 and connects the various parts of the whole terminal device 6 by various interfaces and lines.
The memory 61 may be used for storing the computer programs and/or modules, and the processor 60 implements various functions of the terminal device 6 by running or executing the computer programs and/or modules stored in the memory 61 and calling data stored in the memory 61. The memory 61 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory 61 may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Wherein, the module integrated by the terminal device 6 can be stored in a computer readable storage medium if it is implemented in the form of software functional unit and sold or used as a stand-alone product. Based on such understanding, all or part of the flow in the method according to the above embodiments may be implemented by a computer program, which may be stored in a computer readable storage medium and used by the processor 60 to implement the steps of the above embodiments of the method. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
The embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, where when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the method for verifying the breaking capacity of the circuit breaker.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method for verifying the breaking capacity of a circuit breaker is characterized by comprising the following steps:
acquiring a preset electromagnetic transient model of the doubly-fed wind turbine generator, and constructing a fault test system according to the preset electromagnetic transient model;
acquiring a current-voltage characteristic curve under the condition of short-circuit fault based on the fault test system;
calculating to obtain the short-circuit current effective value of the double-fed wind turbine generator according to the current-voltage characteristic curve;
and checking the current breaking capacity of the circuit breaker according to the effective value of the short-circuit current.
2. The method for verifying the breaking capacity of the circuit breaker according to claim 1, wherein the obtaining of the current-voltage characteristic curve under the condition of short-circuit fault based on the fault testing system comprises:
adjusting the size of a transition resistor of the fault testing system to simulate the condition of short-circuit fault and obtain simulation data corresponding to different voltage drop degrees;
and obtaining a current-voltage characteristic curve under the condition of short-circuit fault according to the simulation data.
3. The method for verifying the circuit breaking capacity of the circuit breaker as claimed in claim 1, wherein the calculating the effective short-circuit current value of the doubly-fed wind turbine generator according to the current-voltage characteristic curve comprises:
obtaining critical voltage values corresponding to different critical voltage points according to the current-voltage characteristic curve;
calculating an actual voltage value of a bus where the doubly-fed wind turbine generator is located when a short-circuit fault occurs at a preset fault point based on the fault test system;
and calculating the short-circuit current effective value of the double-fed wind turbine generator according to the magnitude relation between the critical voltage values corresponding to different critical voltage points and the actual voltage value.
4. The method for verifying the circuit breaking capacity of the circuit breaker according to claim 3, wherein the step of calculating the actual voltage value of the bus where the doubly-fed wind turbine generator is located when the short-circuit fault occurs at the preset fault point based on the fault testing system comprises:
acquiring fault current at a preset fault point based on the fault test system;
and calculating the actual voltage value of the bus where the doubly-fed wind turbine generator is located according to the fault current.
5. The method for verifying the circuit breaker breaking capacity of the circuit breaker according to claim 4, wherein the formula for calculating the actual voltage value of the bus where the doubly-fed wind turbine generator is located according to the fault current is as follows:
wherein the content of the first and second substances,
the actual voltage value of the bus where the doubly-fed wind turbine generator is located,
for presetting the normal voltage of the fault point f before the occurrence of a short-circuit fault, ZkfIs the impedance between node k and fault point f, ifIs the fault current at the preset fault point f.
6. The method for verifying the breaking capacity of the circuit breaker according to claim 1, wherein the verifying the breaking capacity of the circuit breaker according to the effective value of the short-circuit current comprises the following steps:
acquiring the on-off current of the circuit breaker;
and obtaining a checking result of the current breaking capacity of the circuit breaker according to the magnitude relation between the effective short-circuit current value and the breaking current of the circuit breaker.
7. The method for verifying the breaking capacity of the circuit breaker according to claim 6, wherein the step of obtaining the result of verifying the breaking capacity of the circuit breaker according to the magnitude relation between the effective value of the short-circuit current and the breaking current of the circuit breaker comprises the following steps:
when the effective value of the short-circuit current is larger than the on-off current of the circuit breaker, judging that the current breaking capacity of the circuit breaker does not meet the working requirement;
and when the effective value of the short-circuit current is smaller than the on-off current of the circuit breaker, judging that the current breaking capacity of the circuit breaker meets the working requirement.
8. A device for verifying the breaking capacity of a circuit breaker is characterized by comprising:
the fault testing system building module is used for obtaining a preset electromagnetic transient model of the double-fed wind turbine generator and building a fault testing system according to the preset electromagnetic transient model;
the fault characteristic curve acquisition module is used for acquiring a current-voltage characteristic curve under the condition of short-circuit fault based on the fault test system;
the short-circuit current effective value calculating module is used for calculating the short-circuit current effective value of the double-fed wind turbine generator according to the current-voltage characteristic curve;
and the circuit breaker breaking capacity verifying module is used for verifying the breaking capacity of the circuit breaker according to the effective value of the short-circuit current.
9. A terminal device comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the method of checking the breaking capability of a circuit breaker according to any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, comprising a stored computer program, wherein the computer program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the method for verifying the breaking capability of a circuit breaker according to any one of claims 1 to 7.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117492405A (en) * | 2024-01-02 | 2024-02-02 | 东方电气风电股份有限公司 | Verification method for wind turbine generator control system based on field bus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117492405A (en) * | 2024-01-02 | 2024-02-02 | 东方电气风电股份有限公司 | Verification method for wind turbine generator control system based on field bus |
| CN117492405B (en) * | 2024-01-02 | 2024-03-08 | 东方电气风电股份有限公司 | Verification method for wind turbine generator control system based on field bus |
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