CN114089023A - Detection method and device for secondary cable disturbance voltage by VFTO and computer equipment - Google Patents
Detection method and device for secondary cable disturbance voltage by VFTO and computer equipment Download PDFInfo
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Abstract
The application relates to a method and a device for detecting disturbance voltage of VFTO to a secondary cable and computer equipment. The detection method of the VFTO to the disturbance voltage of the secondary cable comprises the following steps: obtaining equivalent parameters of each device in the GIS transformer substation: establishing an equivalent circuit model of the VFTO for transmitting disturbance to the secondary cable through the CVT according to equivalent parameters of each device; and simulating the equivalent circuit model by using electromagnetic transient simulation software to obtain the disturbance voltage generated by the VFTO of each device to the secondary cable through the CVT. The method can realize disturbance voltage detection.
Description
Technical Field
The application relates to the technical field of transformer substations, in particular to a method and a device for detecting disturbance voltage of VFTO to a secondary cable and computer equipment.
Background
Gas Insulated Switchgear (GIS) has the advantages of compact structure, small floor area, easy maintenance, etc., and is widely used in high-voltage power grids, and GIS equipment is increasingly used in high-voltage ac power transmission systems. In a GIS substation, a Very Fast Transient Overvoltage (VFTO) is generated when a circuit breaker, a disconnector, and an earthing switch operate or a single-phase earth short circuit fault occurs, wherein the disconnector operation is a main cause of the generation of the Very Fast transient Overvoltage.
When VFTO is transmitted through a high-Voltage bus, disturbance Voltage is generated on the secondary side through a Capacitive Voltage Transformer (CVT), which affects normal operation and running of secondary equipment, and may cause malfunction. Therefore, detection and analysis of VFTO to the disturbance voltage of the secondary cable are required, and further protection research on the secondary cable disturbance is realized.
At present, the disturbance generated by VFTO is mainly theoretically deduced and simulated in a laboratory, and the disturbance voltage cannot be really analyzed.
Disclosure of Invention
Therefore, in order to solve the technical problems, it is necessary to provide a method and an apparatus for detecting disturbance voltage of a secondary cable by VFTO, a computer device and a storage medium, which can realize the detection of disturbance voltage.
A method for detecting disturbance voltage of VFTO to a secondary cable comprises the following steps:
obtaining equivalent parameters of each device in the GIS transformer substation:
establishing an equivalent circuit model of the VFTO for transmitting disturbance to the secondary cable through the CVT according to equivalent parameters of each device;
and simulating the equivalent circuit model by using electromagnetic transient simulation software to obtain the disturbance voltage generated by the VFTO of each device to the secondary cable through the CVT.
In one embodiment, the establishing an equivalent circuit model of VFTO for conducting disturbance to the secondary cable through the CVT according to the equivalent parameters of each device includes:
the method comprises the steps of enabling a transformer to be equivalent to a first capacitor and an equivalent inductor which are arranged in series, and calculating the capacitance value of the first capacitor and the inductance value of the equivalent inductor;
the method comprises the following steps of (1) enabling an isolating switch electric arc during arcing to be equivalent to a U-shaped time-varying resistor, and calculating the resistance range of the U-shaped time-varying resistor;
the lightning arrester is equivalent to a second capacitor, and the capacitance value of the second capacitor is calculated;
the sleeve is equivalent to a third capacitor, and the capacitance value of the third capacitor is calculated;
the current transformer is equivalent to a fourth capacitor, and the capacitance value of the fourth capacitor is calculated;
the method comprises the steps that an isolating switch is equivalent to a fifth capacitor, and the capacitance values of the fifth capacitor under the switching-off condition and the switching-on condition of the isolating switch are respectively calculated;
the breaker during opening is equivalent to a sixth capacitor, and the capacitance value of the sixth capacitor is calculated;
a bus between any two devices is equivalent to a wave impedance, and an impedance value of each wave impedance is calculated.
In one embodiment, the establishing an equivalent circuit model of VFTO for conducting disturbance to the secondary cable through the CVT according to the equivalent parameters of each device further includes:
establishing a conduction equivalent circuit of the VFTO conducted through the CVT according to the VFTO through the CVT conduction path.
In one embodiment, the conductive equivalent circuit comprises a seventh capacitor, an eighth capacitor, a ninth capacitor, a ground lead inductance, a ground impedance, a CVT equivalent impedance, and a secondary cable equivalent impedance;
the first end of the seventh capacitor is electrically connected with the high-voltage bus, and the second end of the seventh capacitor is electrically connected with the first end of the eighth capacitor;
a second end of the eighth capacitor is electrically connected with a first end of the grounding lead inductor;
the second end of the grounding lead inductor is electrically connected with a grounding grid;
a first end of the ninth capacitor is electrically connected to a second end of the eighth capacitor, and a second end of the ninth capacitor is electrically connected to a first end of the CVT equivalent impedance;
the second end of the CVT equivalent impedance is electrically connected with the first end of the secondary cable equivalent impedance;
and the second end of the equivalent impedance of the secondary cable is electrically connected with the grounding grid.
In one embodiment, the establishing an equivalent circuit model of VFTO for conducting disturbance to the secondary cable through the CVT according to the equivalent parameters of each device includes:
acquiring a circuit structure of the GIS transformer substation;
and carrying out equivalence on each device according to the circuit structure of the GIS transformer substation, and establishing the equivalent circuit model.
In one embodiment, the simulating the equivalent circuit model by using electromagnetic transient simulation software includes:
and selecting a running mode of a single-variable single bus and single line to simulate the equivalent circuit model.
In one embodiment, the method further comprises the following steps:
simulating to obtain disturbance voltage at the tail end of the secondary cable;
fourier analysis is carried out on disturbance voltage at the tail end of the secondary cable, and amplitudes of harmonic components of the disturbance voltage at different frequencies are determined;
selecting a filter capacitor to simulate filters with different amplitudes according to the amplitudes of harmonic components of the disturbance voltage at different frequencies for filtering simulation;
determining an amplitude value for a filter disposed at the end of the secondary cable according to a result of the filtering simulation.
A detection device for VFTO to disturbance voltage of a secondary cable comprises:
the equivalent parameter acquisition module is used for acquiring equivalent parameters of each device in the GIS transformer substation:
the equivalent model establishing module is used for establishing an equivalent circuit model of the secondary cable conducted disturbance of the VFTO through the CVT according to equivalent parameters of each device;
and the simulation module is used for simulating the equivalent circuit model by using electromagnetic transient simulation software to obtain disturbance voltage generated by the VFTO of each device to the secondary cable through the CVT.
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:
obtaining equivalent parameters of each device in the GIS transformer substation:
establishing an equivalent circuit model of the VFTO for transmitting disturbance to the secondary cable through the CVT according to equivalent parameters of each device;
and simulating the equivalent circuit model by using electromagnetic transient simulation software to obtain the disturbance voltage generated by the VFTO of each device to the secondary cable through the CVT.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
obtaining equivalent parameters of each device in the GIS transformer substation:
establishing an equivalent circuit model of the VFTO for transmitting disturbance to the secondary cable through the CVT according to equivalent parameters of each device;
and simulating the equivalent circuit model by using electromagnetic transient simulation software to obtain the disturbance voltage generated by the VFTO of each device to the secondary cable through the CVT.
According to the detection method and device for the disturbance voltage of the VFTO to the secondary cable, the computer equipment and the storage medium, the equivalent parameters of all equipment in the GIS substation are obtained, the equivalent circuit model of the VFTO to conduct disturbance to the secondary cable through the CVT is established, the equivalent circuit model is simulated by using electromagnetic transient simulation software, the disturbance voltage of the VFTO to the secondary cable through the CVT can be simulated when the isolating switch acts in a real environment, the disturbance voltage of all equipment can be obtained, and a basis is provided for analysis and research of interference protection.
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In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for detecting a secondary cable disturbance voltage by VFTO according to an embodiment;
FIG. 2 is a schematic diagram of the conduction path of a VFTO through a CVT according to one embodiment;
FIG. 3 is a schematic diagram of a conductive equivalent circuit configuration according to an embodiment;
FIG. 4 is a flowchart illustrating steps of an embodiment for building an equivalent circuit model of VFTO for conducting disturbance to a secondary cable via a CVT based on equivalent parameters of each device;
FIG. 5 is a flow chart of a method for detecting a secondary cable disturbance voltage by VFTO in another embodiment;
fig. 6 is a block diagram of a configuration of the detection apparatus for detecting a secondary cable disturbance voltage by VFTO according to an embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
In a GIS substation, information of primary equipment and related operations and control signals are connected to secondary equipment controlling a protection cubicle via secondary cables. When VFTO spreads on the high-voltage bus, the high-frequency transient voltage is conducted to a secondary cable and secondary equipment through the bus and the distributed capacitance between mutual inductance equipment and the distributed capacitance between the primary side and the secondary side of the mutual inductance equipment, and the secondary equipment is threatened to be insulated seriously. A method capable of detecting disturbance voltage of VFTO to a secondary cable through a CVT is urgently needed, so that the formation of the disturbance voltage and factors influencing the disturbance voltage can be analyzed, and disturbance protection measures are provided for protection.
As shown in fig. 1, an embodiment of the present application provides a method for detecting a disturbance voltage of a VFTO to a secondary cable, including:
and 101, acquiring equivalent parameters of each device in the GIS substation.
Each device in the GIS substation includes a bus, a cable, an isolating switch, a transformer and other electrical elements, and the equivalent parameter is a parameter of an element equivalent to each device, for example, if the equivalent parameter is a capacitor, the equivalent parameter is a capacitance value of the capacitor. And acquiring equivalent parameters of each device according to the actually configured electrical elements in different GIS substations.
And 102, establishing an equivalent circuit model of the VFTO for transmitting disturbance to the secondary cable through the CVT according to equivalent parameters of each device.
The equivalent circuit model is a circuit model for conducting disturbance on a secondary cable through a CVT (constant voltage transformer) by VFTO (very fast transient overvoltage) which is obtained by carrying out equivalence on each device in a GIS (geographic information System) substation through equivalent elements and configuring according to equivalent parameters.
And 103, simulating the equivalent circuit model by using electromagnetic transient simulation software to obtain disturbance voltage generated by the VFTO of each device to the secondary cable through the CVT.
And simulating the equivalent circuit model by using electromagnetic transient simulation software, controlling the action of the isolating switch, acquiring disturbance voltage generated by VFTO of each device to the secondary cable through the CVT, and acquiring the waveform of the disturbance voltage at each device for analysis.
According to the detection method for the disturbance voltage of the VFTO to the secondary cable, the equivalent circuit model of the VFTO to conduct disturbance to the secondary cable through the CVT is established by obtaining the equivalent parameters of each device in the GIS substation, the equivalent circuit model is simulated by using electromagnetic transient simulation software, the disturbance voltage of the VFTO to the secondary cable through the CVT can be simulated when the isolating switch acts in a real environment, the disturbance voltage of each device can be obtained, and a basis is provided for analysis and research of interference protection.
In one embodiment, the establishing an equivalent circuit model of VFTO for conducting disturbance to the secondary cable through the CVT according to the equivalent parameters of each device includes:
the method comprises the steps of enabling a transformer to be equivalent to a first capacitor and an equivalent inductor which are arranged in series, and calculating the capacitance value of the first capacitor and the inductance value of the equivalent inductor;
the method comprises the following steps of (1) enabling an isolating switch electric arc during arcing to be equivalent to a U-shaped time-varying resistor, and calculating the resistance range of the U-shaped time-varying resistor;
the lightning arrester is equivalent to a second capacitor, and the capacitance value of the second capacitor is calculated;
the sleeve is equivalent to a third capacitor, and the capacitance value of the third capacitor is calculated;
the current transformer is equivalent to a fourth capacitor, and the capacitance value of the fourth capacitor is calculated;
the method comprises the steps that an isolating switch is equivalent to a fifth capacitor, and the capacitance values of the fifth capacitor under the switching-off condition and the switching-on condition of the isolating switch are respectively calculated;
the breaker during opening is equivalent to a sixth capacitor, and the capacitance value of the sixth capacitor is calculated;
a bus between any two devices is equivalent to a wave impedance, and an impedance value of each wave impedance is calculated.
The GIS transformer substation is provided with a plurality of devices, including not only transformers, lightning arresters and other devices, but also switch devices such as mutual inductors, high-voltage buses, sleeves, circuit breakers, isolating switches and the like. For the accuracy of simulation, an accurate and reliable simulation model needs to be established for the electrical equipment. Except the transformer, other devices are sealed in a GIS metal shell, and SF6 insulating gas is filled in the GIS metal shell. When the isolating switch is switched on and off, due to the fact that the contact is low in moving speed, repeated breakdown and pre-breakdown can be generated between fractures, broken pulse waves propagate to two sides along the conducting wire, the waves are reflected at the discontinuous position of GIS wave impedance, and the forward waves and the reverse waves are overlapped together to form the VFTO. In the embodiment of the application, the transformer is equivalent to a first capacitor and an equivalent inductor; the isolating switch is equivalent to a U-shaped time-varying resistor during arcing, and is equivalent to a centralized ground capacitor with different values during closing or opening; the bus of the GIS is equivalent to wave impedance; the circuit breaker is equivalent to a part of a circuit when being switched on, and is equivalent to a series capacitor when being switched off; the lightning arrester, the current transformer and the sleeve can be equivalent to a centralized capacitor to the ground. Based on the working principle and physical characteristics of each device, a reasonable equivalent element is determined for each device, and an equivalent parameter value is calculated according to the working parameters of each device.
In one embodiment, the establishing an equivalent circuit model of VFTO for conducting disturbance to the secondary cable through the CVT according to the equivalent parameters of each device further includes:
establishing a conduction equivalent circuit of the VFTO conducted through the CVT according to the VFTO through the CVT conduction path.
As shown in fig. 2, transient overvoltage U on the high voltage busBThrough a voltage-dividing capacitor Cf1、Cf2And then conducted to a secondary cable connected to the secondary side of the CVT via a distributed capacitance C between the secondary sides. In addition, a part of transient overvoltage UBThe voltage is injected into the grounding network through the grounding lead inductance LG and the grounding impedance ZG of the CVT, so that local ground potential rise is formed on the grounding network, and interference is caused to secondary equipment connected to the grounding network. Based on this, a conduction equivalent circuit can be established in which VFTO is conducted through the CVT.
As shown in fig. 3, in one embodiment, the conductive equivalent circuit includes a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a ground lead inductor LG, a ground impedance ZG, a CVT equivalent impedance zctl, and a secondary cable equivalent impedance ZL; a first end of the seventh capacitor C7 is electrically connected with the high-voltage bus, and a second end of the seventh capacitor C7 is electrically connected with a first end of the eighth capacitor C8; a second end of the eighth capacitor C8 is electrically connected with a first end of the grounding lead inductor LG; the second end of the grounding lead inductor LG is electrically connected with a grounding grid; a first end of the ninth capacitor C9 is electrically connected with a second end of the eighth capacitor C8, and a second end of the ninth capacitor C9 is electrically connected with a first end of the CVT equivalent impedance ZCVT; the second end of the CVT equivalent impedance ZCVT is electrically connected with the first end of the secondary cable equivalent impedance ZL; and the second end of the equivalent impedance ZL of the secondary cable is electrically connected with the grounding grid.
Wherein, the seventh capacitor C7 and the eighth capacitor C8 are voltage dividing capacitors, UBThe ninth capacitor C9 is the distributed capacitance between the secondary winding and the cable shield for the transient potential at the CVT lead. According to circuit theory, the interference source UG can be expressed as:
wherein the input impedance ZinComprises the following steps:
assuming the line is lossless, the propagation constant Γ is:
wherein L is0And C0Inductance and capacitance of the cable unit length, respectively, and reflection coefficient of the primary side cable is rho1The reflection coefficient of the secondary side cable is rho2；
The equivalent total impedance is:
based on the uniform transmission line theory, the disturbance voltage on the secondary cable is:
where l is the length of the secondary cable and ω is the angular frequency.
As shown in fig. 4, in one embodiment, the establishing an equivalent circuit model of VFTO conducted disturbance to the secondary cable through the CVT according to the equivalent parameters of each device includes:
step 401, obtaining a circuit structure of the GIS substation.
And 402, carrying out equivalence on each device according to the circuit structure of the GIS substation, and establishing the equivalent circuit model.
And (4) performing equivalence on the circuit structure of the GIS transformer substation based on the equivalent model of each electrical element determined by the embodiment to establish an equivalent circuit model.
In one embodiment, the simulating the equivalent circuit model by using electromagnetic transient simulation software includes:
and selecting a running mode of a single-variable single bus and single line to simulate the equivalent circuit model.
The fast transient overvoltage analysis method is characterized in that the single-bus single line is a single bus, and one cable has an operation mode of one transformer, so that the fast transient overvoltage level is highest in the operation mode, and the analysis of the disturbance voltage of the VFTO to the secondary cable through the CVT is facilitated.
Because the secondary equipment is seriously disturbed by the excessive disturbance voltage, the amplitude of the disturbance voltage is closely related to the size of the primary VFTO. Therefore, the suppression and protection of the VFTO on the disturbance voltage of the secondary cable and the secondary equipment can be researched and simulated and analyzed respectively by reducing the amplitude of the VFTO on the primary side and developing related protection measures on the secondary side, and the simulation analysis can be carried out on an equivalent circuit model.
For protection of the primary side VFTO, the VFTO on the high voltage bus can be reduced by employing a spiral tube damped bus.
Most of overvoltage generated when the GIS isolating switch is operated comes from a power transmission conductor, the overvoltage exists in the form of flowing waves, the propagation of the overvoltage can be equivalent to the establishment of an electromagnetic field, and the electromagnetic energy is propagated or stored in different directions around a line. The spiral tube damping bus is a threaded coil structure with a hollow center, and a non-inductive damping resistor and an epoxy support member are arranged inside the spiral tube damping bus. Due to the structure, the inductance value is larger than that of a normal bus, and the wave impedance of the line can be changed. The damping resistance can increase the active power during transmission, thereby inhibiting the traveling wave and reducing the amplitude and frequency of overvoltage. The suppression principle is similar to that of a magnetic ring, but the conductor is not magnetic conductive, so that the magnetic saturation cannot occur to reduce the precaution effect. The spiral tube damping bus skill is adopted to inhibit overvoltage and achieve the conduction function of a normal bus. The damping bus can be equivalent to a parallel structure of resistance + inductance + air gap, and the multi-strand bus can be equivalent to a series connection of a plurality of structures. In the equivalent circuit model, a bus is replaced by a parallel structure of resistance, inductance and air gap for simulation analysis.
The length of the cable can be adjusted in an equivalent circuit model, the wave impedances with different impedance values are used for equivalent the cables with different lengths, the relation between the length of the secondary cable and the disturbance voltage is analyzed, and the optimal length of the secondary cable is found.
By respectively simulating the shielding layer ungrounded method, the shielding layer single-end grounded method and the shielding layer two-end grounded method, the disturbance voltage at the tail end of the secondary cable and the amplitude of each harmonic component thereof in different grounded modes can be obtained, and the optimal grounded mode is selected to inhibit the interference.
As shown in fig. 5, in one embodiment, the method for detecting the secondary cable disturbance voltage by the VFTO further includes:
and 501, simulating to obtain disturbance voltage at the tail end of the secondary cable.
Step 502, performing Fourier analysis on the disturbance voltage at the tail end of the secondary cable, and determining the amplitudes of harmonic components of the disturbance voltage at different frequencies.
And 503, selecting a filter capacitor to simulate filters with different amplitudes according to the amplitudes of the harmonic components of the disturbance voltage at different frequencies to perform filtering simulation.
Step 504, determining the amplitude of the filter arranged at the end of the secondary cable according to the result of the filtering simulation.
Since the frequency component of VFTO is very complex, it contains a large amount of high frequency harmonic components. After the shielding layer is grounded, the VFTO amplitude at the end of the secondary cable is still high and the components of each harmonic are still complex, even the amplitude of the harmonic component is increased, so that corresponding filtering equipment is required to reduce the amplitude of the harmonic component and the disturbance voltage. Fourier analysis is carried out on disturbance voltage at the tail end of the secondary cable obtained through simulation, amplitudes of harmonic components with different frequencies are determined, then different filter capacitors are selected to simulate filters with different amplitudes to carry out filtering simulation, the amplitude of the most appropriate filter is determined according to the result of the filtering simulation, and then the corresponding filter is selected to be only corresponding to the tail end of the secondary cable.
It should be understood that, although the steps in the flowcharts of fig. 1, 4 and 5 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence 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 a portion of the steps in fig. 1, 4, and 5 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 alternately or alternately with other steps or at least a portion of the steps or stages in other steps.
In one embodiment, as shown in fig. 6, there is provided a detection apparatus for detecting a disturbance voltage of a VFTO to a secondary cable, including:
the equivalent parameter obtaining module 601 is configured to obtain equivalent parameters of each device in the GIS substation:
an equivalent model establishing module 602, configured to establish an equivalent circuit model of VFTO for conducting disturbance to a secondary cable through a CVT according to equivalent parameters of each device;
the simulation module 603 is configured to simulate the equivalent circuit model by using electromagnetic transient simulation software, so as to obtain disturbance voltage generated by the VFTO of each device to the secondary cable through the CVT.
For specific limitation of the detection device for detecting the secondary cable disturbance voltage by the VFTO, reference may be made to the above limitation of the detection method for detecting the secondary cable disturbance voltage by the VFTO, and details are not described here again. All or part of each module in the detection device for the secondary cable disturbance voltage by the VFTO can be realized by software, hardware and a combination 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. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
In one embodiment, a computer device is provided, which includes a memory and a processor, where the memory stores a computer program, and the processor executes the computer program to implement the method for detecting the secondary cable disturbance voltage by VFTO.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which when executed by a processor implements the above-described method for detecting a VFTO disturbance voltage on a secondary cable.
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.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
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 detection method of VFTO to secondary cable disturbance voltage is characterized by comprising the following steps:
obtaining equivalent parameters of each device in the GIS transformer substation:
establishing an equivalent circuit model of the VFTO for transmitting disturbance to the secondary cable through the CVT according to equivalent parameters of each device;
and simulating the equivalent circuit model by using electromagnetic transient simulation software to obtain the disturbance voltage generated by the VFTO of each device to the secondary cable through the CVT.
2. The method for detecting the disturbance voltage of the VFTO to the secondary cable according to claim 1, wherein the step of establishing an equivalent circuit model of the VFTO to conduct disturbance to the secondary cable through the CVT according to equivalent parameters of each device comprises the following steps:
the method comprises the steps of enabling a transformer to be equivalent to a first capacitor and an equivalent inductor which are arranged in series, and calculating the capacitance value of the first capacitor and the inductance value of the equivalent inductor;
the method comprises the following steps of (1) enabling an isolating switch electric arc during arcing to be equivalent to a U-shaped time-varying resistor, and calculating the resistance range of the U-shaped time-varying resistor;
the lightning arrester is equivalent to a second capacitor, and the capacitance value of the second capacitor is calculated;
the sleeve is equivalent to a third capacitor, and the capacitance value of the third capacitor is calculated;
the current transformer is equivalent to a fourth capacitor, and the capacitance value of the fourth capacitor is calculated;
the method comprises the steps that an isolating switch is equivalent to a fifth capacitor, and the capacitance values of the fifth capacitor under the switching-off condition and the switching-on condition of the isolating switch are respectively calculated;
the breaker during opening is equivalent to a sixth capacitor, and the capacitance value of the sixth capacitor is calculated;
a bus between any two devices is equivalent to a wave impedance, and an impedance value of each wave impedance is calculated.
3. The method for detecting the disturbance voltage of the VFTO to the secondary cable according to claim 2, wherein an equivalent circuit model of the VFTO to conduct disturbance to the secondary cable through the CVT is established according to equivalent parameters of each device, and the method further comprises the following steps:
establishing a conduction equivalent circuit of the VFTO conducted through the CVT according to the VFTO through the CVT conduction path.
4. The method for detecting the disturbance voltage of the VFTO to the secondary cable according to claim 3, wherein the conduction equivalent circuit comprises a seventh capacitor, an eighth capacitor, a ninth capacitor, a grounding lead inductor, a grounding impedance, a CVT equivalent impedance and a secondary cable equivalent impedance;
the first end of the seventh capacitor is electrically connected with the high-voltage bus, and the second end of the seventh capacitor is electrically connected with the first end of the eighth capacitor;
a second end of the eighth capacitor is electrically connected with a first end of the grounding lead inductor;
the second end of the grounding lead inductor is electrically connected with a grounding grid;
a first end of the ninth capacitor is electrically connected to a second end of the eighth capacitor, and a second end of the ninth capacitor is electrically connected to a first end of the CVT equivalent impedance;
the second end of the CVT equivalent impedance is electrically connected with the first end of the secondary cable equivalent impedance;
and the second end of the equivalent impedance of the secondary cable is electrically connected with the grounding grid.
5. The method for detecting the disturbance voltage of the VFTO to the secondary cable according to claim 4, wherein the step of establishing an equivalent circuit model of the VFTO to conduct disturbance to the secondary cable through the CVT according to equivalent parameters of each device comprises the following steps:
acquiring a circuit structure of the GIS transformer substation;
and carrying out equivalence on each device according to the circuit structure of the GIS transformer substation, and establishing the equivalent circuit model.
6. The VFTO secondary cable disturbance voltage detection method according to claim 1, wherein the simulating the equivalent circuit model by using electromagnetic transient simulation software comprises:
and selecting a running mode of a single-variable single bus and single line to simulate the equivalent circuit model.
7. The method for detecting disturbance voltage of VFTO to a secondary cable according to claim 4, further comprising:
simulating to obtain disturbance voltage at the tail end of the secondary cable;
fourier analysis is carried out on disturbance voltage at the tail end of the secondary cable, and amplitudes of harmonic components of the disturbance voltage at different frequencies are determined;
selecting a filter capacitor to simulate filters with different amplitudes according to the amplitudes of harmonic components of the disturbance voltage at different frequencies for filtering simulation;
determining an amplitude value for a filter disposed at the end of the secondary cable according to a result of the filtering simulation.
8. The utility model provides a VFTO is to detection device of secondary cable harassment voltage which characterized in that includes:
the equivalent parameter acquisition module is used for acquiring equivalent parameters of each device in the GIS transformer substation:
the equivalent model establishing module is used for establishing an equivalent circuit model of the secondary cable conducted disturbance of the VFTO through the CVT according to equivalent parameters of each device;
and the simulation module is used for simulating the equivalent circuit model by using electromagnetic transient simulation software to obtain disturbance voltage generated by the VFTO of each device to the secondary cable through the CVT.
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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