CN110837065B - Short-circuit point detection method and device of generator circuit and equipment terminal - Google Patents
Short-circuit point detection method and device of generator circuit and equipment terminal Download PDFInfo
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- CN110837065B CN110837065B CN201911188088.3A CN201911188088A CN110837065B CN 110837065 B CN110837065 B CN 110837065B CN 201911188088 A CN201911188088 A CN 201911188088A CN 110837065 B CN110837065 B CN 110837065B
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Abstract
The invention relates to a short-circuit point detection method, a device and an equipment terminal of a generator circuit, the short-circuit point detection method enables bus capacitor voltage to reach a preset target voltage by starting a network side converter, when the bus capacitor voltage reaches the preset target voltage, a rotor side converter is started to generate a pulse voltage control signal and send the pulse voltage control signal to a generator, when a short-circuit fault exists in the generator circuit, an actual maximum value corresponding to the change rate of loop current is obtained, a short-circuit point is determined according to the actual maximum value, a first test maximum value and a second test maximum value, the first test maximum value is the maximum value of the change rate of the loop current when the terminal of the rotor side converter is in the short-circuit test when the generator circuit does not have the short-circuit fault, the second test maximum value is the maximum value of the change rate of the loop current when the terminal of the rotor of the generator is in the short-circuit test when the generator circuit does not have the short-circuit fault, the short-circuit point detection method improves the speed and efficiency of the generator circuit fault maintenance.
Description
Technical Field
The invention relates to the field of fault detection, in particular to a method and a device for detecting a short circuit point of a generator circuit and an equipment terminal.
Background
At present, the loading amount of wind power generation is continuously increased, the requirements on the reliability and the stability of the wind power generation are higher and higher, and the quick positioning and recovery of the fault of the wind power generation are very important. In the method, for the interior of a winding, a collecting ring, a carbon brush, a cable or a converter of the doubly-fed wind generator, a short-circuit problem caused by insulation damage or insufficient electrical gap is very easy to occur, so that the determination of the position of a fault point often needs a long time, and usually, a mode of checking the positions of the arc-pulling points one by one or insulation measurement by using an insulation meter is adopted.
Disclosure of Invention
In view of the above, the invention provides a method and an apparatus for detecting a short-circuit point of a generator circuit, and an apparatus terminal, which can determine the short-circuit point quickly by determining the change of the rising speed of the rotor current without increasing the hardware cost, thereby improving the speed and efficiency of the generator circuit fault detection, and indirectly improving the power generation amount of the generator.
A short-circuit point detection method of a generator circuit comprises a grid-side converter, a bus capacitor and a rotor-side converter, wherein the grid-side converter and the rotor-side converter are respectively connected with the bus capacitor in parallel, the grid-side converter is also used for being connected with a power grid, and the rotor-side converter is also used for being connected with a rotor terminal of a generator;
the short circuit point detection method comprises the following steps:
starting a network side converter to enable the voltage of a bus capacitor to reach a preset target voltage;
when the voltage of the bus capacitor reaches a preset target voltage, starting a rotor-side converter to generate a pulse voltage control signal and sending the pulse voltage control signal to a generator;
when the short-circuit fault exists in the generator circuit, the actual maximum value of the current change rate of the corresponding loop is obtained;
determining a short-circuit point according to the actual maximum value, the second test maximum value and the second test maximum value;
the first test maximum value is the maximum value of the corresponding loop current change rate when the short-circuit fault does not exist in the generator circuit, the second test maximum value is the maximum value of the loop current change rate when the short-circuit fault does not exist in the generator circuit, the rotor terminal of the generator is subjected to the short-circuit test, and the first test maximum value is larger than the second test maximum value.
In one embodiment, the step of determining the short-circuit point from the actual maximum, the first test maximum and the second test maximum comprises:
comparing the actual maximum value with the first test maximum value and the second test maximum value respectively;
when the actual maximum value is larger than or equal to the first test maximum value, judging that the short-circuit point is positioned in the rotor-side converter;
when the actual maximum value is smaller than or equal to the second test maximum value, judging that the short-circuit point is positioned in the generator;
and when the actual maximum value is larger than the second test maximum value and smaller than the first test maximum value, judging that the short-circuit point is positioned on a rotor cable which is connected with the rotor side converter and a rotor terminal of the generator.
In one embodiment, the generator is a two-phase generator or a three-phase generator, and the process of obtaining the maximum value of the change rate of the corresponding loop current in the terminal short circuit test of the rotor-side converter comprises the following steps:
and obtaining and comparing the respective maximum values of the phase current change rates of the rotor-side converter during the terminal short-circuit test, and selecting the corresponding maximum value as the first test maximum value.
In one embodiment, the generator is a two-phase generator or a three-phase generator, and the process of obtaining the maximum value of the change rate of the corresponding loop current in the terminal short circuit test of the rotor-side converter comprises the following steps:
and obtaining and comparing the maximum values of the phase current change rates of the generator during the short-circuit test of the rotor terminal, and selecting the corresponding maximum value as the second test maximum value.
In one embodiment, the generator is a two-phase generator or a three-phase generator, and the process of obtaining the actual maximum value of the corresponding loop current change rate comprises:
and obtaining and comparing the maximum values of the change rates of the phase currents, and selecting the corresponding maximum value as an actual maximum value.
In addition, still provide a short-circuit point detection device of generator circuit, generator circuit includes net side converter, bus-bar capacitance and rotor side converter, and net side converter and rotor side converter are connected with bus-bar capacitance parallel connection respectively, and short-circuit point detection device includes:
the charging unit is used for starting the grid-side converter to enable the voltage of the bus capacitor to reach a preset target voltage;
the signal generating and sending unit is used for starting the rotor side converter to generate a pulse voltage control signal and sending the pulse voltage control signal to the generator when the voltage of the bus capacitor reaches a preset target voltage;
the actual maximum value acquisition unit is used for acquiring the actual maximum value of the current change rate of the corresponding loop when the short-circuit fault exists in the generator circuit;
the position detection unit is used for determining a short-circuit point according to an actual maximum value, a first test maximum value and a second test maximum value, wherein the first test maximum value is the maximum value of the corresponding loop current change rate when the terminal of the rotor-side converter is subjected to short-circuit test when the generator circuit has no short-circuit fault, the second test maximum value is the maximum value of the loop current change rate when the rotor terminal of the generator is subjected to short-circuit test when the generator circuit has no short-circuit fault, and the first test maximum value is larger than the second test maximum value.
In one embodiment, the position detection unit includes:
a comparison unit for comparing the actual maximum value with the first test maximum value and the second test maximum value, respectively;
the first processing unit is used for judging that the short-circuit point is positioned in the rotor-side converter when the actual maximum value is larger than or equal to the first test maximum value;
the second processing unit is used for judging that the short-circuit point is positioned in the generator when the actual maximum value is smaller than or equal to the second test maximum value;
and the third processing unit is used for judging that the short-circuit point is positioned on the rotor cable connecting the rotor-side converter and the rotor terminal of the generator when the actual maximum value is larger than the second test maximum value and smaller than the first test maximum value.
In one embodiment, the generator is a two-phase generator or a three-phase generator, and the actual maximum value obtaining unit is configured to obtain and compare respective maximum values of the phase current change rates, and select a corresponding maximum value as the actual maximum value.
In addition, a device terminal is provided, wherein the second maximum test value comprises a memory and a processor, the memory is used for storing a computer program, and the processor runs the computer program to enable the device terminal to execute the short circuit point detection method.
A readable storage medium, a second test maximum readable storage medium, stores a computer program which, when executed by a processor, implements the short circuit point detection method described above.
The short-circuit point detection method of the generator circuit comprises the steps of starting the network side converter to enable the bus capacitor voltage to reach a preset target voltage, starting the rotor side converter to generate a pulse voltage control signal and sending the pulse voltage control signal to the generator when the bus capacitor voltage reaches the preset target voltage, obtaining an actual maximum value corresponding to the change rate of the loop current when the generator circuit has a short-circuit fault, and determining the short-circuit point according to the actual maximum value, a first test maximum value and a second test maximum value, wherein the first test maximum value is the corresponding loop current change rate when the terminal of the rotor side converter is subjected to a short-circuit test when the generator circuit does not have the short-circuit fault, the second test maximum value is the second test maximum value of the loop current change rate when the terminal of the rotor of the generator is subjected to the short-circuit test when the generator circuit does not have the short-circuit fault, and the first test maximum value is larger than the second test maximum value, the method can determine the short-circuit point quickly by judging the change of the rising speed of the rotor current under the condition of not increasing the hardware cost, further lay a foundation for subsequent accurate positioning of the short-circuit point, improve the speed and efficiency of the generator circuit fault maintenance, and indirectly improve the generated energy of the generator at the same time.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention. Like components are numbered similarly in the various figures.
Fig. 1 is a schematic diagram of an application environment corresponding to a short-circuit point detection method of a generator circuit in an embodiment;
FIG. 2 is a schematic flow chart of a method for detecting a short-circuit point of a generator circuit according to an embodiment;
FIG. 3 is a schematic flow chart illustrating a method for determining a short-circuit point according to one embodiment;
FIG. 4 is a block diagram of a short-circuit point detection device of a generator circuit according to an embodiment;
fig. 5 is a block diagram showing a structure of a position detection unit in one embodiment.
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.
The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Various embodiments of the present disclosure will be described more fully hereinafter. The present disclosure is capable of various embodiments and of modifications and variations therein. However, it should be understood that: there is no intention to limit the various embodiments of the disclosure to the specific embodiments disclosed herein, but rather, the disclosure is to cover all modifications, equivalents, and/or alternatives falling within the spirit and scope of the various embodiments of the disclosure.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present invention, are only intended to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
Fig. 1 is a schematic diagram of an application environment corresponding to a short-circuit point detection method of a generator circuit in an embodiment, where the generator circuit 100 includes a grid-side converter 110, a bus capacitor 120, and a rotor-side converter 130, the grid-side converter 110 and the rotor-side converter 130 are respectively connected in parallel with the bus capacitor 120, the grid-side converter 110 is further configured to be connected to a power grid, and the rotor-side converter 130 is further configured to be connected to a rotor end of a generator 140.
The generator adopts a doubly-fed grid-side converter 110, which is generally connected with a power grid through a grid-side main contactor S1, the stator side of the generator 140 can be connected with the power grid through a grid-connected contactor S3, the bus capacitor 120 is also connected with a three-phase rectification unit, and the three-phase rectification unit is connected with the power grid through a grid-side soft start contactor S2, wherein R is a charging resistor.
Where P1 denotes a terminal of the rotor-side converter, and P2 denotes a rotor terminal of the generator 140.
Fig. 2 is a schematic flow chart illustrating a short-circuit point detection method of a generator circuit according to an embodiment, where the short-circuit point detection method includes:
step S210, starting the grid-side converter to make the bus capacitor voltage reach a preset target voltage.
The network side soft start contactor S2 is closed, the bus capacitor is charged firstly, when the voltage of the bus capacitor reaches the initial starting voltage threshold value, the network side main contactor S1 is closed, the voltage of the bus capacitor is continuously increased to the preset target voltage, and the starting process can avoid the generation of impact current and prevent the circuit device from being damaged.
And step S220, when the voltage of the bus capacitor reaches a preset target voltage, starting the rotor-side converter to generate a pulse voltage control signal and sending the pulse voltage control signal to the generator.
When the voltage of the bus capacitor reaches a preset target voltage, the rotor-side converter is further started to generate a PWM pulse voltage control signal, and a circuit loop of the generator generates corresponding induced current.
And step S230, when the short-circuit fault exists in the generator circuit, acquiring the actual maximum value of the change rate of the corresponding loop current.
At the moment, if a short-circuit fault point exists in the generator circuit, the current change rate of the loop of the whole corresponding generator circuit can be measured, and generally, the rotor current change rate corresponding to the position of the side of the generator rotor can be conveniently obtained.
Step S240, determining a short-circuit point according to the actual maximum value, a first test maximum value and a second test maximum value, wherein the first test maximum value is the maximum value of the corresponding loop current change rate when the terminal of the rotor-side converter is subjected to short-circuit test when the short-circuit fault does not exist in the generator circuit, the second test maximum value is the maximum value of the loop current change rate when the terminal of the rotor of the generator is subjected to short-circuit test when the short-circuit fault does not exist in the generator circuit, and the first test maximum value is larger than the second test maximum value.
In the circuit environment schematic diagram shown in fig. 1, when the short-circuit fault does not exist in the motor circuit, the rotor-side converter generates a pulse voltage control signal and sends the pulse voltage control signal to the generator, the whole generator loop generates loop current, a terminal P1 of the rotor-side converter is subjected to a short-circuit test and is subjected to short-circuit grounding, and the maximum value of the change rate of the corresponding loop current is measured at the moment, namely a first test maximum value is obtained; similarly, when the short-circuit fault does not exist in the generator circuit, the rotor-side converter generates a pulse voltage control signal and sends the pulse voltage control signal to the generator, the whole generator loop generates loop current, the rotor terminal P2 of the generator is grounded, the maximum value of the loop current change rate during the short-circuit test of the rotor terminal of the generator is obtained, and the second test maximum value is obtained.
Obviously, the short-circuit point is determined from the actual maximum, the first test maximum and the second test maximum.
According to the short circuit point detection method of the generator circuit, under the condition that the hardware cost is not increased and the voltage is constant, the rotor side converter sends the pulse control signal, the short circuit point is determined quickly by judging the change of the rising speed of the rotor current, the foundation is laid for the subsequent accurate positioning of the short circuit point, the speed and the efficiency of the fault maintenance of the generator circuit are improved, and meanwhile the generated energy of the generator is indirectly improved.
In one embodiment, as shown in fig. 3, step S240 includes:
step S242, comparing the actual maximum value with the first test maximum value and the second test maximum value, and when the actual maximum value is greater than or equal to the first test maximum value, proceeding to step S244; when the actual maximum value is less than or equal to the second test maximum value, go to step S246; when the actual maximum value is greater than the second test maximum value and less than the first test maximum value, the process proceeds to step S248.
After a circuit fault occurs in the generator, the rotor-side converter generates a pulse voltage control signal and sends the pulse voltage control signal, and the short-circuit points are located at different positions, so that the change rates of the rotor loop currents corresponding to the generator rotor are different, and therefore the actual maximum value needs to be compared with the first test maximum value and the second test maximum value respectively, and the position area of the short-circuit point needs to be further judged.
In step S244, it is determined that the short-circuit point is located inside the rotor-side converter.
If the short-circuit point is not positioned in the rotor-side converter, according to a formula U ═ L ═ di/dt, under the condition of a certain voltage, the maximum value (actual maximum value) of the corresponding loop current change rate is smaller than the first test maximum value, because the first test maximum value is the maximum value of the corresponding loop current change rate obtained when the terminal of the rotor-side converter is subjected to short-circuit test when the short-circuit fault does not exist in the generator circuit.
Step S246, determining that the short-circuit point is located inside the generator.
If the short-circuit point is not located inside the generator according to the formula U-L (di/dt), the corresponding loop current change rate is always greater than the second maximum test value according to the formula U-L (di/dt), because the second maximum test value is, when the generator circuit has no short-circuit fault, grounding the rotor terminal of the generator to obtain the maximum value of the loop current change rate during the short-circuit test of the rotor terminal of the generator under the condition of a constant voltage, the equivalent circuit corresponding to the second maximum test value does not include the impedance on the rotor side of the generator, and under the condition of a constant transmitted pulse voltage, the corresponding actual maximum value is always greater than the corresponding loop current change rate when the short-circuit point is located inside the generator.
Step S248, it is judged that the short-circuit point is located on the rotor cable connecting the rotor-side converter and the rotor terminal of the generator.
If the short-circuit point is located between the rotor cables connecting the rotor-side converter and the rotor terminals of the generator, considering that the generator circuit comprises the grid-side converter impedance, the rotor cable impedance and the generator rotor impedance, under the condition that the pulse voltage sent by the rotor side is constant, the actual maximum value is greater than the second test maximum value and less than the first test maximum value according to the formula U ═ L (di/dt).
In one embodiment, the generator is a two-phase generator or a three-phase generator, and when the generator circuit has no short-circuit fault, the process of obtaining the maximum value of the corresponding loop current change rate in the terminal short-circuit test of the rotor-side converter comprises the following steps:
and obtaining and comparing the maximum values of the phase current change rates of the rotor-side converter during the terminal short-circuit test, and selecting the corresponding maximum value as a first test maximum value.
When the generator adopts a two-phase generator or a three-phase generator, and when a short-circuit fault does not exist in a generator circuit, a terminal of a rotor-side converter is subjected to a short-circuit test, since a short-circuit point may be located in each of three phases, and since the maximum value of the current change rate of each phase loop is one, the respective maximum values of the current change rates of the phases need to be compared, and the maximum value is selected to be used as a first test maximum value.
In one embodiment, the generator is a two-phase generator or a three-phase generator, and when the generator circuit has no short-circuit fault, the process of obtaining the maximum value of the corresponding loop current change rate in the terminal short-circuit test of the rotor-side converter comprises the following steps:
and obtaining and comparing the maximum values of the phase current change rates of the generator during the short-circuit test of the rotor terminal, and selecting the corresponding maximum value as a second test maximum value.
When the generator circuit has no short-circuit fault, and the rotor terminal of the generator is subjected to a short-circuit test, because the short-circuit point may be located in each of the three phases, and because one maximum value of the current change rate of each phase loop is provided, the respective maximum values of the current change rates of the phases need to be compared, and the maximum value is selected as a second test maximum value.
In one embodiment, step S230 includes: and obtaining and comparing the maximum values of the change rates of the phase currents, and selecting the corresponding maximum value as an actual maximum value.
When a generator circuit has a short-circuit fault, the maximum values of the phase current change rates of the phases need to be obtained and compared due to the presence of multiphase currents, and the maximum value is selected as the actual maximum value.
Further, as shown in fig. 4, there is provided a short-circuit point detection device 300 of a generator circuit, the short-circuit point detection device 300 including:
the charging unit 310 is used for starting the grid-side converter to enable the bus capacitor voltage to reach a preset target voltage;
the signal generating and sending unit 320 is configured to start the rotor-side converter to generate a pulse voltage control signal and send the pulse voltage control signal to the generator when the bus capacitor voltage reaches a preset target voltage;
an actual maximum value obtaining unit 330, configured to obtain an actual maximum value of a change rate of the corresponding loop current when the short-circuit fault exists in the generator circuit;
the position detecting unit 340 is configured to determine a short-circuit point according to an actual maximum value, a first maximum test value, and a second maximum test value, where the first maximum test value is a maximum value of a loop current change rate corresponding to a terminal short-circuit test of the rotor-side converter when the generator circuit does not have a short-circuit fault, the second maximum test value is a maximum value of a loop current change rate corresponding to a terminal short-circuit test of the generator when the generator circuit does not have a short-circuit fault, and the first maximum test value is greater than the second maximum test value.
In one embodiment, as shown in fig. 5, the position detecting unit 340 includes:
a comparing unit 342 for comparing the actual maximum value with the first test maximum value and the second test maximum value, respectively;
the first processing unit 344, when the actual maximum value is greater than or equal to the first test maximum value, determines that the short-circuit point is located inside the rotor-side converter;
a second processing unit 346, which judges that the short-circuit point is located inside the generator when the actual maximum value is less than or equal to the second test maximum value;
a third processing unit 348 for determining that the short-circuit point is located on the rotor cable connecting the rotor-side converter and the rotor terminal of the generator when the actual maximum value is larger than the second test maximum value and smaller than the first test maximum value.
In one embodiment, the generator is a two-phase generator or a three-phase generator, and the actual maximum value obtaining unit 330 is configured to obtain and compare the maximum values of the respective phase current change rates, and select the maximum value as the actual maximum value.
In addition, a device terminal is provided, wherein the second maximum test value comprises a memory and a processor, the memory is used for storing a computer program, and the processor runs the computer program to enable the device terminal to execute the short circuit point detection method.
A readable storage medium, a second test maximum readable storage medium, stores a computer program which, when executed by a processor, implements the short circuit point detection method described above.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative and, for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, each functional module or unit in each embodiment of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention or a part of the technical solution that contributes to the prior art in essence can be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a smart phone, a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (8)
1. A short-circuit point detection method of a generator circuit is characterized in that the generator circuit comprises a grid-side converter, a bus capacitor and a rotor-side converter, the grid-side converter and the rotor-side converter are respectively connected with the bus capacitor in parallel, the grid-side converter is also used for being connected with a power grid, the rotor-side converter is also used for being connected with a rotor terminal of a generator, and the short-circuit point detection method comprises the following steps:
starting a network side converter to enable the voltage of the bus capacitor to reach a preset target voltage;
when the voltage of the bus capacitor reaches a preset target voltage, starting a rotor-side converter to generate a pulse voltage control signal and sending the pulse voltage control signal to a generator;
when the generator circuit has a short-circuit fault, acquiring an actual maximum value of a corresponding loop current change rate;
determining a short-circuit point according to the actual maximum value, the first test maximum value and the second test maximum value;
the first test maximum value is the maximum value of the corresponding loop current change rate in the short-circuit test of the terminal of the rotor-side converter when the short-circuit fault does not exist in the generator circuit, the second test maximum value is the maximum value of the loop current change rate in the short-circuit test of the rotor terminal of the generator when the short-circuit fault does not exist in the generator circuit, and the first test maximum value is larger than the second test maximum value;
the step of determining a short-circuit point according to the actual maximum value, the first test maximum value, and the second test maximum value specifically includes:
comparing the actual maximum value with the first test maximum value and the second test maximum value, respectively;
when the actual maximum value is larger than or equal to the first test maximum value, judging that the short-circuit point is positioned in the rotor-side converter;
when the actual maximum value is smaller than or equal to the second test maximum value, judging that the short-circuit point is positioned in the generator;
and when the actual maximum value is larger than the second test maximum value and smaller than the first test maximum value, judging that the short-circuit point is positioned on a rotor cable which connects the rotor-side converter and a rotor terminal of the generator.
2. The method for detecting a short-circuit point according to claim 1, wherein the generator is a two-phase generator or a three-phase generator, and the step of obtaining the maximum value of the change rate of the corresponding loop current during the terminal short-circuit test of the rotor-side converter comprises:
and obtaining and comparing the respective maximum values of the phase current change rates of the rotor-side converter during the terminal short-circuit test, and selecting the corresponding maximum value as the first test maximum value.
3. The short-circuit point detection method according to claim 1, wherein the generator is a two-phase generator or a three-phase generator, and the step of obtaining the maximum value of the loop current change rate during the short-circuit test of the rotor terminal of the generator comprises:
and obtaining and comparing the respective maximum values of the phase current change rates of the generator during the short-circuit test of the rotor terminal, and selecting the corresponding maximum value as the second test maximum value.
4. The method of claim 1, wherein the generator is a two-phase generator or a three-phase generator, and the step of obtaining the actual maximum value of the rate of change of the corresponding loop current comprises:
and obtaining and comparing the maximum values of the change rates of the phase currents, and selecting the corresponding maximum value as an actual maximum value.
5. A short-circuit point detection device for a generator circuit, wherein the generator circuit comprises a grid-side converter, a bus capacitor and a rotor-side converter, the grid-side converter and the rotor-side converter are respectively connected in parallel with the bus capacitor, the short-circuit point detection device comprising:
the charging unit is used for starting the grid-side converter to enable the voltage of the bus capacitor to reach a preset target voltage;
the signal generating and sending unit is used for starting the rotor side converter to generate a pulse voltage control signal and sending the pulse voltage control signal to the generator when the voltage of the bus capacitor reaches a preset target voltage;
the actual maximum value acquisition unit is used for acquiring the actual maximum value of the current change rate of the corresponding loop when the short-circuit fault exists in the generator circuit;
the position detection unit is used for determining a short-circuit point according to the actual maximum value, a first test maximum value and a second test maximum value, wherein the first test maximum value is the maximum value of the corresponding loop current change rate when the terminal of the rotor-side converter is subjected to short-circuit test when the generator circuit has no short-circuit fault, the second test maximum value is the maximum value of the loop current change rate when the rotor terminal of the generator is subjected to short-circuit test when the generator circuit has no short-circuit fault, and the first test maximum value is larger than the second test maximum value;
the position detection unit specifically includes:
a comparison unit for comparing the actual maximum value with the first test maximum value and the second test maximum value, respectively;
the first processing unit is used for judging that the short-circuit point is positioned in the rotor-side converter when the actual maximum value is larger than or equal to the first test maximum value;
the second processing unit is used for judging that the short-circuit point is positioned in the generator when the actual maximum value is smaller than or equal to the second test maximum value;
and the third processing unit is used for judging that the short-circuit point is positioned on a rotor cable connecting the rotor-side converter and a rotor terminal of the generator when the actual maximum value is larger than the second test maximum value and smaller than the first test maximum value.
6. The short-circuit point detection device according to claim 5, wherein the generator is a two-phase generator or a three-phase generator, and the actual maximum value obtaining unit is configured to obtain and compare respective maximum values of the phase current change rates, and select a corresponding maximum value as the actual maximum value.
7. A device terminal, comprising a memory for storing a computer program and a processor for executing the computer program to cause the device terminal to perform the short circuit point detection method of any one of claims 1 to 4.
8. A readable storage medium, characterized in that it stores a computer program which, when executed by a processor, implements the short circuit point detection method of any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4203142A (en) * | 1978-07-31 | 1980-05-13 | Lee Donald E | Ground fault system and method of detection |
| US6724597B1 (en) * | 1998-08-31 | 2004-04-20 | Siemens Aktiengesellschaft | Protection device for low voltage networks |
| CN103595279A (en) * | 2013-11-18 | 2014-02-19 | 河南师范大学 | Photovoltaic inverter fixed-frequency-type model prediction control method in power grid asymmetric fault |
| CN204205931U (en) * | 2014-12-02 | 2015-03-11 | 保定四方三伊电气有限公司 | IGBT collector voltage clamp circuit |
| CN104714132A (en) * | 2015-03-17 | 2015-06-17 | 上海交通大学 | Flexible direct current power transmission converter performance testing platform and control method thereof |
| CN105572544A (en) * | 2016-02-01 | 2016-05-11 | 河南理工大学 | Current change rate-based coal mine power grid short-circuiting fault quick judging device and method |
| CN106324415A (en) * | 2016-08-16 | 2017-01-11 | 株洲中车时代电气股份有限公司 | Diagnosis method and monitoring method for turn-to-turn short circuit fault of double-winding synchronous wind driven generator |
| CN107732905A (en) * | 2017-10-19 | 2018-02-23 | 国家电网公司 | The short-circuit current calculation method of current transformer grid type distributed power source |
| CN109375054A (en) * | 2018-09-26 | 2019-02-22 | 南方电网科学研究院有限责任公司 | A kind of fault-line selecting method of DC transmission system |
-
2019
- 2019-11-28 CN CN201911188088.3A patent/CN110837065B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4203142A (en) * | 1978-07-31 | 1980-05-13 | Lee Donald E | Ground fault system and method of detection |
| US6724597B1 (en) * | 1998-08-31 | 2004-04-20 | Siemens Aktiengesellschaft | Protection device for low voltage networks |
| CN103595279A (en) * | 2013-11-18 | 2014-02-19 | 河南师范大学 | Photovoltaic inverter fixed-frequency-type model prediction control method in power grid asymmetric fault |
| CN204205931U (en) * | 2014-12-02 | 2015-03-11 | 保定四方三伊电气有限公司 | IGBT collector voltage clamp circuit |
| CN104714132A (en) * | 2015-03-17 | 2015-06-17 | 上海交通大学 | Flexible direct current power transmission converter performance testing platform and control method thereof |
| CN105572544A (en) * | 2016-02-01 | 2016-05-11 | 河南理工大学 | Current change rate-based coal mine power grid short-circuiting fault quick judging device and method |
| CN106324415A (en) * | 2016-08-16 | 2017-01-11 | 株洲中车时代电气股份有限公司 | Diagnosis method and monitoring method for turn-to-turn short circuit fault of double-winding synchronous wind driven generator |
| CN107732905A (en) * | 2017-10-19 | 2018-02-23 | 国家电网公司 | The short-circuit current calculation method of current transformer grid type distributed power source |
| CN109375054A (en) * | 2018-09-26 | 2019-02-22 | 南方电网科学研究院有限责任公司 | A kind of fault-line selecting method of DC transmission system |
Non-Patent Citations (1)
| Title |
|---|
| 考虑低电压穿越全过程的双馈风电机组短路电流计算方法;杨国生;《电网技术》;20180731;第42卷(第7期);全文 * |
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