Action mechanism diagnosis circuit of grid-connected circuit breaker and wind power converter

Abstract

The utility model provides a kind of action mechanism diagnostic circuit of grid-connected circuit breaker and wind power converter of grid-connected circuit breaker, and the action mechanism diagnostic circuit of grid-connected circuit breaker includes converter control module, relay switch circuit and grid-connected circuit breaker state feedback circuit;Converter control module obtains the feedback signal of relay switch circuit by the first group of contact of relay switch circuit;Grid-connected circuit breaker is connected with power supply by the second group of contact of relay switch circuit;Converter control module obtains the action feedback signal of grid-connected circuit breaker by grid-connected circuit breaker state feedback circuit, and with the feedback signal of relay switch circuit is matched to diagnose the action mechanism state of grid-connected circuit breaker.This method realizes the abnormality of online real-time diagnosis wind power converter grid-connected circuit breaker action mechanism, timely predication shutdown maintenance, avoid affecting the normal operation of surrounding circuit, also avoid wind turbine unit to appear longer period of shutdown recovery.

Description

Technical Field

[0001] This utility model relates to the technical field of wind turbine generator and converter grid connection system, and in particular to a diagnostic circuit for the operating mechanism of a grid-connected circuit breaker and a wind power converter. Background Technology

[0002] The grid-connected circuit breaker in a wind turbine converter plays both a control and protection role in the main circuit of the wind turbine generator. During operation, the closing or opening drive mechanism of the grid-connected circuit breaker may fail. If this mechanism fails, the circuit breaker cannot close or open normally, preventing the wind turbine converter from connecting to or disconnecting from the grid. This is especially problematic when the main circuit malfunctions and requires immediate opening, but the circuit breaker cannot be opened in time, leading to a escalation of the converter fault and prolonged wind turbine shutdown. The recovery period after a main circuit fault is generally relatively long, resulting in a loss of power generation from the wind turbine generator.

[0003] Traditional wind turbines are typically only inspected after the grid-connected circuit breaker in the converter fails, without prior real-time online diagnostics of the circuit breaker's operating mechanism. However, once the circuit breaker fails, in addition to the circuit breaker's inability to close or open normally, causing the wind turbine converter to fail to connect to or disconnect from the grid, there's also the possibility that, in cases of main circuit malfunctions requiring immediate disconnection, the failure to do so can exacerbate the converter failure, leading to prolonged wind turbine downtime and power generation losses. Utility Model Content

[0004] The technical problem to be solved by this utility model is the defect in the prior art that the wind turbine is shut down for a long time because the grid-connected circuit breaker of the wind power converter is only repaired after it fails. The present invention provides a diagnostic circuit for the operating mechanism of the grid-connected circuit breaker and a wind power converter.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] This utility model provides a diagnostic circuit for the operating mechanism of a grid-connected circuit breaker. The diagnostic circuit for the operating mechanism of the grid-connected circuit breaker includes a converter control module and a relay switch circuit and a grid-connected circuit breaker status feedback circuit that are electrically connected to the converter control module.

[0007] Both the relay switching circuit and the grid-connected circuit breaker status feedback circuit are electrically connected to the grid-connected circuit breaker.

[0008] The converter control module obtains the feedback signal of the relay switching circuit through the first set of contacts of the relay switching circuit;

[0009] The grid-connected circuit breaker is connected to the power supply through the second set of contacts of the relay switching circuit;

[0010] The converter control module obtains the operation feedback signal of the grid-connected circuit breaker through the grid-connected circuit breaker status feedback circuit, and matches it with the feedback signal of the relay switch circuit to diagnose the operating mechanism status of the grid-connected circuit breaker.

[0011] Preferably, the grid-connected circuit breaker includes:

[0012] The undervoltage trip coil is used to drive the operating mechanism of the grid-connected circuit breaker to trip according to the trip control signal;

[0013] The closing coil is used to drive the operating mechanism of the grid-connected circuit breaker to close.

[0014] Preferably, the relay switching circuit includes a tripping relay switching circuit;

[0015] The converter control module obtains the tripping feedback signal of the tripping relay switch circuit through the first set of contacts of the tripping relay switch circuit.

[0016] The undervoltage trip coil is connected to the power supply through the second set of contacts of the trip relay switching circuit.

[0017] Preferably, when the converter control module trips, it obtains the tripping action feedback signal of the grid-connected circuit breaker through the grid-connected circuit breaker status feedback circuit, and matches it with the tripping feedback signal of the tripping relay switch circuit to diagnose the tripping status of the operating mechanism of the grid-connected circuit breaker.

[0018] Preferably, the relay switching circuit includes a closing relay switching circuit;

[0019] The converter control module obtains the closing feedback signal of the closing relay switch circuit through the first set of contacts of the closing relay switch circuit.

[0020] The closing coil is connected to the power supply through the second set of contacts of the closing relay switching circuit.

[0021] Preferably, when the converter control module closes the circuit, it obtains the closing action feedback signal of the grid-connected circuit breaker through the grid-connected circuit breaker status feedback circuit, and matches it with the closing feedback signal of the closing relay switch circuit to diagnose the closing status of the operating mechanism of the grid-connected circuit breaker.

[0022] Preferably, when the closing action feedback signal of the grid-connected circuit breaker does not match the closing feedback signal of the relay switch circuit, the converter control module controls the relay switch circuit to reset and re-drives the closing relay switch circuit to perform the action.

[0023] Preferably, the relay switching circuit further includes:

[0024] A drive coil is used to drive the contacts of the relay switching circuit to close or open.

[0025] Preferably, the grid-connected circuit breaker further includes:

[0026] Energy storage coils are used to provide electrical energy to the operating mechanism of grid-connected circuit breakers.

[0027] The relay switching circuit includes an energy storage relay switching circuit;

[0028] The energy storage coil is connected to the power supply through the contacts of the energy storage relay switching circuit.

[0029] This utility model also provides a wind power converter for the main circuit of a wind turbine generator set, wherein the wind power converter includes the operating mechanism diagnostic circuit of the grid-connected circuit breaker as described above.

[0030] The positive and progressive effects of this utility model are as follows:

[0031] This invention relates to a method for diagnosing the normal operation of the operating mechanism of a grid-connected circuit breaker. By diagnosing abnormalities in the operating mechanism of the wind power converter grid-connected circuit breaker in real time, it can make timely predictions, stop and maintain the circuit in a timely manner, avoid the failure of the grid-connected circuit breaker from affecting the normal operation of its surrounding circuits, and also avoid long-term shutdown and recovery of wind turbine units, thus saving potential power generation losses from wind turbine units. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments in this specification, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this specification. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0033] Figure 1 This is a first structural schematic diagram of the diagnostic circuit of the operating mechanism of a grid-connected circuit breaker according to an embodiment of the present invention.

[0034] Figure 2 This is a second structural schematic diagram of the diagnostic circuit of the operating mechanism of a grid-connected circuit breaker according to an embodiment of the present invention. Detailed Implementation

[0035] The present invention will be described more clearly and completely below with reference to the accompanying drawings, using a preferred embodiment.

[0036] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the document does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0037] It should be understood that the terms “device,” “system,” “unit,” and / or “module” used herein are one way to distinguish different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0038] As illustrated herein, unless the context clearly indicates otherwise, the words “a,” “an,” “an,” and / or “the” do not specifically refer to the singular and may also include the plural. Generally speaking, the terms “comprising” and “including” only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0039] The definitions used herein, such as the terms “having,” “may have,” “comprising,” or “may include,” indicate the presence of the corresponding function, operation, element, etc., and do not limit the presence of one or more other functions, operations, elements, etc. Furthermore, it should be understood that the terms “comprising” or “having” as used herein indicate the presence of the features, figures, steps, operations, elements, components, or combinations thereof described in the specification, without excluding the presence or addition of one or more other features, figures, steps, operations, elements, components, or combinations thereof.

[0040] Example 1

[0041] Please refer to Figure 1 This is a first structural schematic diagram of the diagnostic circuit for the operating mechanism of the grid-connected circuit breaker in this embodiment. Specifically, as shown... Figure 1 As shown, the diagnostic circuit for the operating mechanism of the grid-connected circuit breaker includes a converter control module 1, a relay switch circuit 2 and a grid-connected circuit breaker status feedback circuit 3, which are electrically connected to the converter control module 1 respectively; the grid-connected circuit breaker status feedback circuit 3 is electrically connected to the grid-connected circuit breaker.

[0042] The relay switch circuit 2 is electrically connected to the grid-connected circuit breaker and is used to control the grid-connected circuit breaker to open or close.

[0043] The converter control module 1 obtains the feedback signal of the relay switch circuit 2 through the first set of contacts of the relay switch circuit 2. This feedback signal can characterize the closing and opening command signals of the grid-connected circuit breaker. The grid-connected circuit breaker is connected to the power supply through the second set of contacts of the relay switch circuit 2. The converter control module 1 obtains the operation feedback signal of the grid-connected circuit breaker through the status feedback circuit 3 of the grid-connected circuit breaker. This operation feedback signal can characterize the actual closing and opening status of the grid-connected circuit breaker and is matched with the feedback signal of the relay switch circuit 2 to diagnose the operating mechanism status of the grid-connected circuit breaker.

[0044] In this embodiment, the diagnostic circuit for the operating mechanism of the grid-connected circuit breaker obtains the feedback signal from the relay switching circuit and controls the energization state of the grid-connected circuit breaker through two sets of contacts of the relay switching circuit. The circuit then matches the operating feedback signal of the grid-connected circuit breaker with the feedback signal of the relay switching circuit to achieve real-time diagnosis of abnormalities in the operating mechanism of the grid-connected circuit breaker.

[0045] Please refer to Figure 2 This is a second structural schematic diagram of the diagnostic circuit for the operating mechanism of the grid-connected circuit breaker in this embodiment. Specifically, as shown... Figure 2 As shown, in this embodiment, the grid-connected circuit breaker QF1 includes:

[0046] The undervoltage trip coil QYTK is used to drive the operating mechanism of the grid-connected circuit breaker to trip according to the tripping control signal or when the voltage of the circuit where the grid-connected circuit breaker QF1 is located is abnormal.

[0047] The closing coil HZ is used to drive the operating mechanism of the grid-connected circuit breaker to close.

[0048] The energy storage coil CN is used to provide electrical energy to the operating mechanism of the grid-connected circuit breaker.

[0049] In one optional embodiment, the relay switching circuit 2 includes a tripping relay switching circuit, a closing relay switching circuit, and an energy storage relay switching circuit. The relay switching circuit 2 further includes a drive coil for driving the contacts of the relay switching circuit 2 to close or open. Specifically, the tripping relay switching circuit is a tripping relay KA1, the closing relay switching circuit is a closing relay KA2, and the energy storage relay switching circuit is specifically an energy storage contactor coil KM. The drive coil includes a tripping drive coil KN1, a closing drive coil KN2, and an energy storage drive coil KN3. The tripping drive coil KN1 is used to drive the contacts of the tripping relay KA1 to close or open; the closing drive coil KN2 is used to drive the contacts of the closing relay KA2 to close or open; and the energy storage drive coil KN3 is used to drive the contacts of the energy storage contactor coil KM to close or open.

[0050] Feedback signals include tripping feedback signals and closing feedback signals. Tripping feedback signals are used to characterize the open state of the relay switching circuit, and closing feedback signals are used to characterize the closed state of the relay switching circuit.

[0051] The action feedback signal includes the opening action feedback signal and the closing action feedback signal. The opening action feedback signal is used to characterize the open state of the grid-connected circuit breaker, and the closing action feedback signal is used to characterize the closed state of the grid-connected circuit breaker.

[0052] The converter control module 1 obtains the tripping feedback signal of the tripping relay switching circuit through the first set of contacts KA11 of the tripping relay KA1; the undervoltage trip coil QYTK is connected to the power supply through the second set of contacts KA12 of the tripping relay KA1.

[0053] The converter control module 1 obtains the closing feedback signal of the closing relay switching circuit through the first set of contacts KA21 of the closing relay KA2; the closing coil HZ is connected to the power supply through the second set of contacts KA22 of the closing relay KA2.

[0054] The energy storage coil CN is connected to the power supply through the contacts of the energy storage contactor coil KM.

[0055] When the converter control module 1 is tripped, it obtains the tripping action feedback signal of the grid-connected circuit breaker QF1 through the grid-connected circuit breaker status feedback circuit 3, and matches it with the tripping feedback signal of the tripping relay switch circuit to diagnose the tripping status of the operating mechanism of the grid-connected circuit breaker QF1.

[0056] When the converter control module 1 closes the circuit, it obtains the closing action feedback signal of the grid-connected circuit breaker QF1 through the grid-connected circuit breaker status feedback circuit 3, and matches it with the closing feedback signal of the closing relay switch circuit to diagnose the closing status of the operating mechanism of the grid-connected circuit breaker QF1.

[0057] In addition, the diagnostic circuit for the operating mechanism of the grid-connected circuit breaker also includes a power supply backup protection switch, which includes a first switch QF2 and a second switch QF3. The first terminal of the first switch QF2 is electrically connected to the first set of contacts of the relay switch circuit 2, and the second terminal of the first switch QF2 is electrically connected to the power supply. The third terminal of the second switch QF3 is electrically connected to the second set of contacts of the relay switch circuit 2, and the fourth terminal of the second switch QF3 is electrically connected to the power supply.

[0058] The working principle of the diagnostic circuit of the operating mechanism of the grid-connected circuit breaker in this embodiment is further illustrated by the following example.

[0059] After the converter control module 1 issues a drive command to the trip relay KA1, the undervoltage trip coil QYTK of the grid-connected circuit breaker QF1 is energized through circuit signal transmission. When the grid-connected circuit breaker QF1 is ready to close, the converter control module 1 issues a drive command to the closing relay KA2. The closing relay KA2's action signal is fed back to the converter control module 1. Almost simultaneously, through circuit signal transmission, the closing coil HZ of the grid-connected circuit breaker QF1 is energized, driving the grid-connected circuit breaker QF1 to close. Under normal circumstances, the closing signal of the grid-connected circuit breaker QF1 should be fed back to the converter control module 1. If the converter control module 1 has issued a closing drive command according to the above procedure but has not received a closing feedback signal from the grid-connected circuit breaker QF1, a preliminary diagnosis can be made that there is an abnormality in the closing action mechanism of the grid-connected circuit breaker QF1.

[0060] Similarly, when the grid-connected circuit breaker QF1 is in the tripping condition, after the converter control module 1 issues a reset command to the tripping relay KA1, the undervoltage trip coil QYTK of the grid-connected circuit breaker QF1 is de-energized through circuit signal transmission, and the grid-connected circuit breaker QF1 trips. Under normal circumstances, the tripping signal of the grid-connected circuit breaker QF1 should be fed back to the converter control module 1. If the converter control module 1 has issued the tripping drive command according to the above process but has not received the tripping feedback signal of the grid-connected circuit breaker QF1, it can be preliminarily diagnosed that there is an abnormality in the undervoltage tripping action mechanism of the grid-connected circuit breaker QF1.

[0061] Specifically, after the circuit is powered normally, the converter control module 1 sends a drive command to the energy storage contactor coil KM. Through circuit signal transmission, the energy storage coil CN of the grid-connected circuit breaker QF1 is energized, and the electric mechanism of the grid-connected circuit breaker QF1 stores energy. After the converter control module 1 sends a drive command to the trip relay KA1, the undervoltage trip coil QYTK of the grid-connected circuit breaker QF1 is energized through circuit signal transmission. When the grid-connected circuit breaker QF1 is ready to close, the converter control module 1 sends a drive command to the closing relay KA2. The closing action signal of the closing relay KA2 (contacts 11-14 closed) is fed back to the converter control module 1. Almost simultaneously, through circuit signal transmission, the closing coil HZ of the grid-connected circuit breaker QF1 is energized, driving the main contacts of the grid-connected circuit breaker QF1 to close. Under normal circumstances, after a 200ms action delay, the closing signal of the grid-connected circuit breaker QF1 (the closing signal of contacts 11-14 or 21-24) should be fed back to the converter control module 1.

[0062] When the grid-connected circuit breaker QF1 is in the tripping condition, the converter control module 1 sends a reset command to the tripping relay KA1. Through circuit signal transmission, the converter control module 1 receives the reset action feedback signal of the tripping relay KA1 (contacts 11-14 open). Almost simultaneously, the undervoltage trip coil QYTK of the grid-connected circuit breaker QF1 is de-energized, and the main contacts of the grid-connected circuit breaker QF1 trip. Under normal circumstances, after a 200ms action delay, the tripping signal of the grid-connected circuit breaker QF1 (the disconnection signal of contacts 11-14 or 21-24) should be fed back to the converter control module 1.

[0063] In another alternative implementation, when the closing action feedback signal of the grid-connected circuit breaker does not match the closing action feedback signal of the relay switching circuit, the converter control module controls the relay switching circuit to reset and re-drives the closing relay switching circuit to perform the action.

[0064] Specifically, if the converter control module 1 has issued a closing drive command according to the above procedure but has not received a closing feedback signal from the grid-connected circuit breaker QF1, the converter control module 1 issues a reset command to the closing relay KA2. If the converter control module 1 receives a reset action feedback signal from the closing relay KA2 (contacts 11-14 open), the converter control module 1 issues a drive command to the closing relay KA2 again. If the converter control module 1 receives a closing action feedback signal from the closing relay KA2 (contacts 11-14 closed), and after a 200ms action delay, still has not received a closing signal from the grid-connected circuit breaker QF1 (closed signal of contacts 11-14 or 21-24), a preliminary diagnosis can be made that the electric closing action mechanism of the grid-connected circuit breaker QF1 is abnormal. At this time, the grid-connected circuit breaker QF1 should be manually closed for inspection in a timely manner to avoid the failure of the grid-connected circuit breaker affecting the normal operation of the wind turbine circuit.

[0065] The method for diagnosing the normal operation of the grid-connected circuit breaker's operating mechanism provided in this embodiment obtains the feedback signal from the relay switching circuit and controls the energization state of the grid-connected circuit breaker through two sets of contacts of the relay switching circuit. The operating feedback signal of the grid-connected circuit breaker is matched with the feedback signal of the relay switching circuit, realizing online real-time diagnosis of abnormalities in the operating mechanism of the wind power converter's grid-connected circuit breaker. This allows for timely prediction, shutdown maintenance, and avoidance of the grid-connected circuit breaker failure affecting the normal operation of its surrounding circuits. It also avoids long-term shutdown and recovery cycles for wind turbine units, thus mitigating potential power generation losses from wind turbine units.

[0066] Example 2

[0067] This embodiment provides a wind power converter for the main circuit of a wind turbine generator set. The wind power converter includes the operating mechanism diagnostic circuit of the grid-connected circuit breaker in Embodiment 1.

[0068] While specific embodiments of this utility model have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the scope of protection of this utility model.

Claims

1. A diagnostic circuit for the operating mechanism of a grid-connected circuit breaker, characterized in that, The diagnostic circuit for the operating mechanism of the grid-connected circuit breaker includes a converter control module, a relay switch circuit and a grid-connected circuit breaker status feedback circuit, which are electrically connected to the converter control module respectively. Both the relay switching circuit and the grid-connected circuit breaker status feedback circuit are electrically connected to the grid-connected circuit breaker. The converter control module obtains the feedback signal of the relay switching circuit through the first set of contacts of the relay switching circuit; The grid-connected circuit breaker is connected to the power supply through the second set of contacts of the relay switching circuit; The converter control module obtains the operation feedback signal of the grid-connected circuit breaker through the grid-connected circuit breaker status feedback circuit, and matches it with the feedback signal of the relay switch circuit to diagnose the operating mechanism status of the grid-connected circuit breaker.

2. The diagnostic circuit for the operating mechanism of a grid-connected circuit breaker as described in claim 1, characterized in that, The grid-connected circuit breaker includes: The undervoltage trip coil is used to drive the operating mechanism of the grid-connected circuit breaker to trip according to the trip control signal; The closing coil is used to drive the operating mechanism of the grid-connected circuit breaker to close.

3. The diagnostic circuit for the operating mechanism of a grid-connected circuit breaker as described in claim 2, characterized in that, The relay switching circuit includes a tripping relay switching circuit; The converter control module obtains the tripping feedback signal of the tripping relay switch circuit through the first set of contacts of the tripping relay switch circuit. The undervoltage trip coil is connected to the power supply through the second set of contacts of the trip relay switching circuit.

4. The diagnostic circuit for the operating mechanism of a grid-connected circuit breaker as described in claim 3, characterized in that, When the converter control module trips, it obtains the tripping action feedback signal of the grid-connected circuit breaker through the grid-connected circuit breaker status feedback circuit, and matches it with the tripping feedback signal of the tripping relay switch circuit to diagnose the tripping status of the operating mechanism of the grid-connected circuit breaker.

5. The diagnostic circuit for the operating mechanism of a grid-connected circuit breaker as described in claim 2, characterized in that, The relay switching circuit includes a closing relay switching circuit; The converter control module obtains the closing feedback signal of the closing relay switch circuit through the first set of contacts of the closing relay switch circuit. The closing coil is connected to the power supply through the second set of contacts of the closing relay switching circuit.

6. The diagnostic circuit for the operating mechanism of a grid-connected circuit breaker as described in claim 5, characterized in that, When the converter control module closes the circuit, it obtains the closing action feedback signal of the grid-connected circuit breaker through the status feedback circuit of the grid-connected circuit breaker, and matches it with the closing feedback signal of the closing relay switch circuit to diagnose the closing status of the operating mechanism of the grid-connected circuit breaker.

7. The diagnostic circuit for the operating mechanism of a grid-connected circuit breaker as described in claim 6, characterized in that, When the closing action feedback signal of the grid-connected circuit breaker does not match the closing feedback signal of the relay switch circuit, the converter control module controls the relay switch circuit to reset and re-drives the closing relay switch circuit to perform the action.

8. The diagnostic circuit for the operating mechanism of a grid-connected circuit breaker as described in claim 1, characterized in that, The relay switching circuit also includes: A drive coil is used to drive the contacts of the relay switching circuit to close or open.

9. The diagnostic circuit for the operating mechanism of a grid-connected circuit breaker as described in claim 1, characterized in that, The grid-connected circuit breaker also includes: Energy storage coils are used to provide electrical energy to the operating mechanism of grid-connected circuit breakers; The relay switching circuit includes an energy storage relay switching circuit; The energy storage coil is connected to the power supply through the contacts of the energy storage relay switching circuit.

10. A wind power converter for use in the main circuit of a wind turbine generator set, characterized in that, The wind power converter includes the operating mechanism diagnostic circuit of the grid-connected circuit breaker as described in any one of claims 1-9.

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