CN114280437B - Generator insulation detection device, method and wind power generation system - Google Patents
Generator insulation detection device, method and wind power generation system Download PDFInfo
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- CN114280437B CN114280437B CN202111616096.0A CN202111616096A CN114280437B CN 114280437 B CN114280437 B CN 114280437B CN 202111616096 A CN202111616096 A CN 202111616096A CN 114280437 B CN114280437 B CN 114280437B
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Abstract
The embodiment of the invention discloses a generator insulation detection device, a method and a wind power generation system. The device comprises a signal detection module, a power supply module and an insulation detection control module; the signal detection module is used for detecting output parameters of the generator; the power supply module is connected with a winding of the generator; the insulation detection control module is connected with the signal detection module and the power supply module; the insulation detection control module is used for controlling the power supply module to supply power to the winding of the generator and receiving detection parameters sent by the signal detection module so as to judge the insulation performance of the generator in real time. Compared with the prior art, the embodiment of the invention realizes real-time detection and prejudgment of the insulation performance of the generator winding, and improves the running reliability of the generator.
Description
Technical Field
The embodiment of the invention relates to the technical field of power generation, in particular to a generator insulation detection device and method and a wind power generation system.
Background
With the progress of new energy power generation technologies such as wind power generation and the like, the installed capacity of new energy power stations is rapidly increased. Accordingly, the influence of the safe and stable operation of the new energy power station on the stable operation of the power grid is increasingly prominent. The generator in the generator set is a key device in a power generation system, and the reliability of the generator is very important. The insulation performance of the generator is directly related to safe use of the generator, and particularly, the insulation performance is low or unqualified, so that the generator cannot be used.
Taking a wind driven generator as an example, in the prior art, an insulation detection method for the wind driven generator is to remove a stator cable between the generator and a converter, and measure insulation resistance of a motor by using insulation withstand voltage test equipment, so that insulation performance of the generator cannot be detected on line in real time. Therefore, the frequency of insulation detection of the generator winding is low, and the working health state of the generator cannot be effectively predicted. Once the generator winding is in insulation failure, the generator set cannot operate, and the generator of the wind power generator set is located at the cabin position, so that maintenance and replacement are difficult, and great economic loss is caused.
Disclosure of Invention
The embodiment of the invention provides a device and a method for detecting the insulation of a generator and a wind power generation system, so that the insulation performance of a generator winding is detected and predicted in real time, and the running reliability of the generator is improved.
In a first aspect, an embodiment of the present invention provides a generator insulation detection device, including:
The signal detection module is used for detecting the output signal of the generator;
The power supply module is connected with the winding of the generator;
The insulation detection control module is connected with the signal detection module and the power supply module; the insulation detection control module is used for controlling the power supply module to supply power to the winding of the generator and receiving the detection signal sent by the signal detection module so as to judge the insulation performance of the generator in real time.
Optionally, the power supply module is multiplexed with a slow start unit of the converter.
Optionally, the signal detection module includes: a voltage transformer and a current transformer;
The voltage transformer and the current transformer are used for detecting parameters of the same phase winding or parameters of different phase windings of the generator.
Optionally, the power supply module includes: a first switching unit, a rectifier and a second switching unit;
The first switch unit is connected in series between the alternating current input end of the rectifier and the power grid;
the second switch unit is connected in series between the direct current output end of the rectifier and the winding of the generator;
the first switch unit and the second switch unit are controlled by the insulation detection control module.
Optionally, the rectifier is at least one of a single-phase bridge rectifier and a three-phase bridge rectifier.
Optionally, the first switch unit and the second switch unit are contact switches of a contactor; the contactor is controlled by the insulation detection control module.
Optionally, the power supply module is multiplexed with a slow start unit of the converter;
the generator insulation detection device further includes: the third switching unit is connected in series between the direct-current side of the converter and the direct-current output end of the rectifier; the third switch unit is controlled by the insulation detection control module.
Optionally, the generator is a direct drive generator; the power supply module is connected with a stator winding of the generator; the signal detection module is connected with a stator winding of the generator.
Optionally, the generator is a doubly fed generator;
the signal detection module is connected with the rotor winding of the generator, and the power supply module is connected with the rotor winding of the generator; and/or the signal detection module is connected with the stator winding of the generator, and the power supply module is connected with the stator winding of the generator.
In a second aspect, an embodiment of the present invention further provides a wind power generation system, including a converter and a generator, where the generator is connected to a power grid through the converter; the converter comprises the generator insulation detection device according to any embodiment of the invention, and the generator performs insulation detection through the generator insulation detection device.
Optionally, the wind power generation system further comprises a circuit breaker, wherein the circuit breaker is connected in series between the grid side end of the converter and the power grid;
The insulation detection control module is multiplexed with the converter control module, and the circuit breaker is controlled by the insulation detection control module.
In a third aspect, an embodiment of the present invention further provides a method for detecting insulation of a generator, where the apparatus for detecting insulation of a generator according to any embodiment of the present invention is used; the method comprises the following steps:
Controlling the power supply module to supply power to the winding of the generator;
Controlling the signal detection module to detect an output signal of the generator;
And judging the insulation performance of the generator in real time according to the detection parameters sent by the signal detection module.
Optionally, before controlling the power supply module to supply power to the winding of the generator, the method further comprises:
And controlling a circuit breaker between the current transformer and the power grid to be opened, and detecting whether the current transformer meets insulation detection conditions.
The embodiment of the invention provides a generator insulation detection device capable of detecting and pre-judging the insulation performance of a generator in real time, which comprises a signal detection module, a power supply module and an insulation detection control module; the signal detection module is used for detecting an output signal of the generator; the power supply module is connected with a winding of the generator; the insulation detection control module is connected with the signal detection module and the power supply module; the insulation detection control module is used for controlling the power supply module to supply power to the winding of the generator and receiving signal parameters sent by the signal detection module so as to judge the insulation performance of the generator in real time. By adopting the generator insulation detection device provided by the embodiment of the invention, the stator cable between the generator and the converter does not need to be dismantled, so that the insulation performance detection of the generator can be realized in real time, and the grid-connected operation of the wind turbine generator can not be influenced for a long time. Therefore, the embodiment of the invention is beneficial to avoiding the problem that the generator set cannot operate due to insulation failure of the generator winding, so that the serious economic loss is caused, and the operation reliability of the generator is improved.
Drawings
Fig. 1 is a schematic structural diagram of a generator insulation detection device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another insulation detection device for a generator according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another insulation detection device for a generator according to an embodiment of the present invention;
Fig. 4 is a schematic structural diagram of another insulation detection device for a generator according to an embodiment of the present invention;
Fig. 5 is a schematic structural diagram of another insulation detection device for a generator according to an embodiment of the present invention;
Fig. 6 is a schematic structural diagram of another insulation detection device for a generator according to an embodiment of the present invention;
Fig. 7 is a schematic structural diagram of another insulation detection device for a generator according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a wind power generation system according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of another wind power generation system according to an embodiment of the present invention;
FIG. 10 is a schematic view of a wind power generation system according to an embodiment of the present invention;
FIG. 11 is a schematic view of a wind power generation system according to an embodiment of the present invention;
FIG. 12 is a schematic view of a wind power generation system according to an embodiment of the present invention;
fig. 13 is a schematic flow chart of a method for detecting insulation of a generator according to an embodiment of the present invention;
fig. 14 is a flow chart of another insulation detection method for a generator according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Fig. 1 is a schematic structural diagram of a generator insulation detection device according to an embodiment of the present invention. Referring to fig. 1, the generator insulation detection apparatus includes: a signal detection module 11, a power supply module 12 and an insulation detection control module 13. The signal detection module 11 is used for detecting output parameters of the generator 20; the power supply module 12 is connected with windings of the generator 20; the insulation detection control module 13 is connected with the signal detection module 11 and the power supply module 12; the insulation detection control module 13 is used for controlling the power supply module 12 to supply power to the windings of the generator 20 and receiving the detection parameters sent by the signal detection module 11 so as to judge the insulation performance of the generator 20 in real time.
The signal detection module 11 may be a module capable of detecting an output parameter of the generator 20, such as a transformer, a sensor, a ammeter, and/or a voltmeter. The principle of operation of the generator insulation detection device is, for example, to control the power supply module to supply a detection voltage to the windings of the generator 20 when the generator set is shut down. At this time, a voltage is present on the windings of the generator 20, and if the generator 20 is well insulated, the voltage will not form a loop, so the current detected by the signal detection module 11 approaches zero (i.e. the equivalent resistance approaches infinity), and accordingly, the insulation detection control module 13 can determine that the generator 20 has no insulation problem according to the received output parameters. In contrast, if the generator 20 has an insulation problem, that is, if the generator 20 has an electric leakage, an electric leakage path is formed, the current detected by the signal detection module 11 is larger (that is, the equivalent resistance is smaller), and accordingly, the insulation detection control module 13 can determine that the generator 20 has an insulation problem according to the received output parameter.
In summary, the embodiment of the invention provides a generator insulation detection device capable of detecting and predicting the insulation performance of a generator 20 in real time, which comprises a signal detection module 11, a power supply module 12 and an insulation detection control module 13. By adopting the generator insulation detection device provided by the embodiment of the invention, the stator cable between the generator and the converter does not need to be dismantled, so that the insulation performance detection of the generator can be realized in real time, and the grid-connected operation of the wind turbine generator can not be influenced for a long time. Therefore, the embodiment of the invention is beneficial to avoiding the problem that the generator set cannot operate due to insulation failure of the generator winding, so that the serious economic loss is caused, and the operation reliability of the generator is improved.
The specific arrangement of the signal detection module 11, the power supply module 12 and the insulation detection control module 13 is various on the basis of the above embodiments, and the following description is given by way of example, but not by way of limitation.
Fig. 2 is a schematic structural diagram of another insulation detection device for a generator according to an embodiment of the present invention. Referring to fig. 2, in one embodiment of the present invention, optionally, the signal detection module 11 includes: a voltage transformer PT and a current transformer CT; the voltage transformer PT and the current transformer CT are used to detect parameters of the same phase winding or parameters of different phase windings of the generator 20. For example, the generator 20 is a three-phase generator, and the signal detection module 11 detects parameters of stator windings of the generator 20, the stator windings being composed of a-phase stator windings, B-phase stator windings, and C-phase stator windings. The voltage transformer PT and the current transformer CT detect the stator windings of the A phase, the B phase or the C phase; or the voltage transformer PT detects the A-phase stator winding, and the current transformer CT detects the B-phase stator winding; or the voltage transformer PT detects the A-phase stator winding, and the current transformer CT detects the C-phase stator winding; or the voltage transformer PT detects the B-phase stator winding, the current transformer CT detects the C-phase stator winding, and other conditions are similar and are not repeated.
Since the windings of the generator 20 are generally Y-connected or delta-connected, the windings of different phases are connected, so if one phase has voltage and current, the other two phases have voltage and current. In practical application, the connection positions of the voltage transformer PT and the current transformer CT can be selected according to the requirements. Preferably, the voltage transformer PT and the current transformer CT are connected to the same phase winding of the generator 20.
With continued reference to FIG. 2, in one embodiment of the invention, the generator 20 is optionally a direct drive generator. The power supply module 12 is connected with the stator winding of the generator 20; the signal detection module 11 is connected to the stator windings of the generator 20. The stator winding of the direct-driven generator is connected with the power module of the converter side, and the direct-driven generator is connected with a power grid through the power module of the converter side and the power module of the converter grid side.
Illustratively, the power supply module 12 may be directly connected to the stator wiring copper bars via copper bar connections between the stator windings of the direct drive generator and the current transformer power modules (including the machine side power modules and the grid side power modules) to provide a detection voltage to the generator 20. Correspondingly, a current transformer CT and a voltage transformer PT respectively detect current and voltage on the wiring copper bar. In practical applications, it may also be provided that the signal detection module 11 comprises only the current transformer CT. If the generator 20 is well insulated, the voltage on the windings will not form a loop, and the current on the wiring copper bars detected by the current transformer CT is near zero (i.e. the equivalent resistance is near infinity). Conversely, if the generator 20 has an insulation problem, that is, the generator 20 has an electric leakage, the voltage on the wiring copper bar can form an electric leakage path, and a larger current (that is, a smaller equivalent resistance) exists on the winding of the generator 20 detected by the current transformer CT. Therefore, the power supply module 12 and the signal detection module 11 are both connected with the stator winding of the generator 20, which is beneficial to simplifying the connection structure of insulation detection.
Fig. 3 is a schematic structural diagram of another insulation detection device for a generator according to an embodiment of the present invention. Referring to fig. 3, in one embodiment of the invention, the generator 20 is optionally a doubly fed generator. The power supply module 12 is connected to the rotor winding of the generator 20, and the signal detection module 11 is connected to the rotor winding of the generator 20. And/or the power supply module 12 is connected with the stator winding of the generator 20, and the signal detection module 11 is connected with the stator winding of the generator 20. The stator winding of the doubly-fed generator is directly connected with a power grid, the rotor winding is connected with the power grid through a current transformer, the frequency, voltage, amplitude and phase of a rotor winding power supply are automatically adjusted by the current transformer according to operation requirements, and the generator set can realize constant-frequency power generation at different rotating speeds so as to meet the requirements of power load and grid connection. Therefore, for the doubly-fed generator, the stator winding and the rotor winding of the doubly-fed generator are provided with copper bars of external connection lines, and the doubly-fed generator is provided with external connection conditions.
Specifically, fig. 3 schematically shows that the power supply module 12 is connected to the rotor winding of the generator 20, and that the voltage sensor PT and the current sensor CT are both connected to the rotor winding of the generator 20. In other embodiments, the power module 12 may also be configured to be coupled to the stator windings of the generator 20, with the voltage sensor PT and the current sensor CT both coupled to the stator windings of the generator 20. It is also possible to provide that both the stator winding and the rotor winding of the generator 20 are connected to the power supply module 12, and both the stator winding and the rotor winding of the generator 20 are connected to the voltage sensor PT and the current sensor CT. Compared with the stator winding of the doubly-fed generator, the current of the rotor winding is smaller, so that if the power supply module 12 is connected with the rotor winding of the generator 20, the voltage sensor PT and the current sensor CT are both connected with the rotor winding of the generator 20, thereby being beneficial to reducing the rated current of the current sensor CT and reducing the cost of the whole machine.
Fig. 4 is a schematic structural diagram of another insulation detection device for a generator according to an embodiment of the present invention. Referring to fig. 4, in one embodiment of the present invention, optionally, the power module 12 includes: a first switching unit 121, a rectifier 122, and a second switching unit 123. The first switch unit 121 is connected in series between the ac input end of the rectifier 122 and the power grid; the second switching unit 123 is connected in series between the dc output of the rectifier 122 and the winding of the generator 20; the first and second switching units 121 and 123 are controlled by the insulation detection control module 13.
The rectifier 122 is capable of rectifying the ac power of the grid into dc power, and providing the generator 20 with an insulation detected voltage. Illustratively, when insulation detection is required for the generator 20, the insulation detection control module 13 controls the first and second switching units 121 and 123 to be closed to provide an insulation detection voltage to the generator 20. When insulation detection of the generator 20 is not required, the insulation detection control module 13 controls the first and second switching units 121 and 123 to be turned off. The first switch unit 121 is arranged, so that the power grid can supply voltage to the rectifier when the insulation detection of the generator is not performed; providing the second switching unit 123 avoids that the generator 20 supplies a voltage to the generator winding when no generator insulation detection is performed. Therefore, the arrangement of the first switch unit 121 and the second switch unit 123 is beneficial to avoiding potential safety hazards caused by electrification in the non-working state of the converter.
In the above embodiments, alternatively, the rectifier 122 may be a single-phase bridge rectifier or a three-phase bridge rectifier, or the like; the specific form of the rectifier 122 may need to be set in practical applications.
Fig. 5 is a schematic structural diagram of another insulation detection device for a generator according to an embodiment of the present invention. Referring to fig. 5, in one embodiment of the present invention, optionally, the rectifier 122 is a three-phase bridge rectifier, and accordingly, the first switching unit 121 is a three-phase switch. The three-phase bridge rectifier 122 has a good rectifying effect, and the output voltage waveform is stable, which is beneficial to improving the accuracy of insulation detection of the generator 20.
With continued reference to fig. 5, the power supply module 12 optionally further includes a current limiting resistor R1, where the current limiting resistor R1 is connected in series between the first switch unit 121 and the rectifier 122, for limiting the current flowing through the rectifier 122. Since the rectifier 122 is a three-phase bridge rectifier, the current limiting resistor R1 includes three resistors, which respectively limit the current of the three phases.
Fig. 6 is a schematic structural diagram of another insulation detection device for a generator according to an embodiment of the present invention. Referring to fig. 6, in one embodiment of the present invention, rectifier 122 is optionally a single phase bridge rectifier. The ac side of rectifier 122 may connect to the a and B phases of the power grid, may also connect to the a and C phases of the power grid, and may also connect to the B and C phases of the power grid. Accordingly, the first switching unit 121 is a two-phase switch. Compared with a three-phase bridge rectifier, the single-phase bridge rectifier is simple in circuit structure and beneficial to cost reduction.
With continued reference to fig. 6, the power supply module 12 optionally further includes a current limiting resistor R1, where the current limiting resistor R1 is connected in series between the first switch unit 121 and the rectifier 122, for limiting the current flowing through the rectifier 122. Since the rectifier 122 is a single-phase bridge rectifier D1, the current limiting resistor R1 includes two resistors, which respectively limit the current of the two phases of wires.
With continued reference to fig. 5 and 6, in addition to the above embodiments, optionally, the first switch unit 121 and the second switch unit 123 are contact switches of contactors; the contactor is controlled by an insulation detection control module 13. The insulation detection control module 13 can control whether the coil of the contactor is electrified or not, so as to control the on-off of the contactor contact switch.
Fig. 7 is a schematic structural diagram of another insulation detection device for a generator according to an embodiment of the present invention. Referring to fig. 7, the power module 12 is optionally multiplexed with the slow start unit of the current transformer on the basis of the above embodiments. The slow start unit is similar to the power supply module 12 in structure, and a rectifier is required to convert the ac voltage of the power grid into the dc voltage. Unlike the power module 12, the slow start unit is electrically connected to the dc side of the converter to charge the dc side before the converter operates normally to ensure that the converter can start normally.
Based on this, the embodiment of the invention provides a generator insulation detection device further comprising: the third switch unit 19, the third switch unit 19 is connected in series between the dc side of the converter and the dc output terminal of the rectifier 122, and the third switch unit 19 is controlled by the insulation detection control module 13. Optionally, the third switching unit 19 is a contact switch of a contactor. The third switch unit 19 is operated by the insulation detection control module 13 controlling the third switch unit 19 to be closed when the generator winding is insulated normally, and the power supply module 12 provides the voltage for the slow start of the converter. The insulation detection control module 13 controls the third switch unit 19 to be disconnected when the converter operates normally, and the converter performs power transmission and grid connection. When insulation detection is needed, the insulation detection control module 13 controls the first switch unit 121 to be closed, the second switch unit 123 to be closed, and the third switch unit 19 to be opened, so that the insulation detection function can be performed when the converter does not work. Therefore, the embodiment of the present invention realizes multiplexing of the insulation detection function and the soft start function by adding the second switching unit 123 and the third switching unit 19. In this way, the first switch unit 121 and the rectifier 122 are not required to be additionally designed, compared with the prior art, the second switch unit 123, the third switch unit 19 and the insulation detection control module 13 are only added, the insulation detection effect is achieved in real time with small changes, and therefore cost reduction is facilitated.
On the basis of the above embodiments, the insulation detection control module 13 is optionally multiplexed with the converter control module. The converter control module is a device for controlling the converter in the power generation system. Specifically, the relevant functions of the insulation detection control module 13 may be added to the converter control module, so as to realize multiplexing of the insulation detection control module 13 and the converter control module, without providing an insulation detection control module in addition. Compared with the prior art, the second switch unit 123 and the third switch unit 19 are added, so that the effect of insulation detection in real time is realized with small modification, and the cost is reduced.
In summary, the embodiment of the invention realizes the function of detecting the insulation performance of the generator in real time by slightly changing the power generation system, does not need to dismantle the stator cable between the generator and the converter, does not influence the grid-connected operation of the wind turbine for a long time, and improves the operation reliability of the generator.
The invention also provides a wind power generation system. Fig. 8 is a schematic structural diagram of a wind power generation system according to an embodiment of the present invention. Referring to fig. 8, the wind power generation system includes a converter 10 and a generator 20, the generator 20 being connected to a power grid through the converter 10; the converter 10 includes the generator insulation detection device according to any embodiment of the present invention, and the generator 20 performs insulation detection through the generator insulation detection device, which has corresponding beneficial effects and is not described herein.
In the above embodiments, the specific implementation manners of the converter 10 and the generator 20 are various, alternatively, as shown in fig. 9, the generator 20 is a direct-drive generator, the converter 10 is a full-power converter, and the rectifier 122 in the converter 10 is a three-phase bridge rectifier. Alternatively, as shown in fig. 10, the generator 20 is a direct drive generator, the converter 10 is a full power converter, and the rectifier 122 in the converter 10 is a single-phase bridge rectifier. Alternatively, as shown in fig. 11, the generator 20 is a doubly fed generator, the converter 10 is a doubly fed converter, and the rectifier 122 in the converter 10 is a three-phase bridge rectifier. As shown in fig. 12, the generator 20 is a doubly fed generator, the converter 10 is a doubly fed converter, and the rectifier 122 in the converter 10 is a single-phase bridge rectifier.
With continued reference to fig. 9-12, the power module 12 is optionally multiplexed with a slow start unit of the converter. The generator insulation detection device further includes: the third switch unit 19, the third switch unit 19 is connected in series between the dc side of the converter and the dc output terminal of the rectifier 122, and the third switch unit 19 is controlled by the insulation detection control module 13.
With continued reference to fig. 9-12, optionally, the wind power generation system further includes a circuit breaker Q1, the circuit breaker Q1 being connected in series between the grid-side end of the converter and the grid; the insulation detection control module 13 is multiplexed with the converter control module, and the circuit breaker Q1 is controlled by the insulation detection control module 13. The arrangement is favorable for controlling the current transformer to stop at any time to perform generator insulation monitoring. At this time, for the doubly-fed current transformer, the insulation detection control module 13 is further configured to control the stator contactor KM5 according to the control of the main control system 50. Compared with the prior art, the second switch unit 123 and the third switch unit 19 are added, so that the effect of insulation detection in real time is realized with small modification, and the cost is reduced. And, by adopting the embodiment of the invention, the condition for insulation detection can be provided by timely controlling the disconnection of the breaker Q1 under various conditions such as starting, standby or stopping of the generator set, so that the insulation performance of the winding of the generator 20 can be detected on line.
Optionally, the main control system 50 is communicatively connected to the insulation detection control module 13.
With continued reference to fig. 9-12, the wind power generation system optionally further includes a tank transformer 40, the tank transformer 40 being connected in series between the grid 30 and the circuit breaker Q1. The box transformer 40 is a box substation for matching the connection between the grid 30 and the converter.
With continued reference to fig. 9-12, the current transformer optionally includes: a network side filter 14, a network side power module 15, a filter capacitor C1, a machine side power module 16 and a machine side power module 17 connected in series between the circuit breaker Q1 and the generator 20. For a doubly fed current transformer, the current transformer further comprises: a grid-side contactor KM4 connected in series between the circuit breaker Q1 and the grid-side filter 14, and a stator contactor KM5 connected in series between the circuit breaker Q1 and the generator 20.
The embodiment of the invention also provides a generator insulation detection method, and the generator insulation detection device provided by any embodiment of the invention has corresponding beneficial effects. Fig. 13 is a schematic flow chart of a method for detecting insulation of a generator according to an embodiment of the present invention. Referring to fig. 13, the generator insulation detection method includes the steps of:
s110, controlling the power supply module to supply power to the winding of the generator.
Optionally, before controlling the power supply module to supply power to the winding of the generator, the method further comprises: and controlling a circuit breaker between the current transformer and the power grid to be opened, and detecting whether the current transformer meets insulation detection conditions.
S120, the signal detection module detects output parameters of the generator.
S130, judging the insulation performance of the generator in real time according to the detection parameters sent by the signal detection module.
Optionally, in conjunction with fig. 9-12, the power module 12 is multiplexed with the slow start unit of the current transformer, and the insulation detection control module 13 is multiplexed with the current transformer control module. S110 and S120 may be performed by the insulation detection control module 13, and S130 may be performed by the insulation detection control module 13 or by the main control system 50.
Fig. 14 is a flow chart of another insulation detection method for a generator according to an embodiment of the present invention. Referring to fig. 14, optionally, the generator insulation detection method includes the steps of:
and S210, the main control system sends an insulation detection command to an insulation detection control module (converter control module).
S220, the converter self-tests and judges whether insulation detection conditions are met; if yes, executing S230; otherwise, S290 is performed.
Referring to fig. 9 to 12, when the insulation detection control module 13 (converter control module) receives the insulation detection command, it controls the circuit breaker Q1 to be opened, and disconnects the generator 20 from the power grid 30. Meanwhile, the insulation detection control module 13 (converter control module) detects the state of the circuit breaker Q1, confirms the opening state, and satisfies the insulation detection condition, thereby completing the self-test of the converter. If the closing state is confirmed, the insulation detection condition is not satisfied, and further judgment is required.
S230, an insulation detection control module (a converter control module) controls the slow starting unit to be put into operation, and the insulation detection voltage is output to the generator.
Specifically, the insulation detection control module (converter control module) controls the first switching unit 121 to be turned on, the second switching unit 123 to be turned on, and the third switching unit 19 to be turned off. The grid-side voltage is rectified into a direct-current voltage by the structure of the current-limiting resistor and the rectifier bridge and is output to the windings of the generator 20.
S240, an insulation detection control module (a converter control module) collects current signals and voltage signals fed back by the generator.
S250, converting the voltage signal and the current signal into impedance by the insulation detection control module (converter control module), and transmitting the impedance to the main control system.
S260, the main control system judges whether the acquired impedance is larger than a preset impedance; if yes, executing S270; otherwise, S280 is performed.
S270, judging that the generator is normal, and the main control system sends a normal working command to the insulation detection control module (converter control module) to switch the converter to a normal power generation mode.
S280, judging that the generator has insulation faults, and carrying out early warning.
S290, judging whether other conditions which do not meet the insulation detection condition exist; if yes, stopping; otherwise, return to S220.
Therefore, through S210-S290, insulation detection of the generator 20 is achieved, and the stator cable of the generator 20 is not required to be removed, so that the insulation performance of the generator 20 can be pre-judged on line, and grid-connected operation of the wind turbine generator cannot be influenced for a long time. The embodiment of the invention can detect the insulation performance of the winding of the generator 20 on line under various conditions such as starting, standby or stopping of the generator set.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. An insulation detection device for a generator, comprising:
The signal detection module is used for detecting the output parameters of the generator;
The power supply module is connected with the winding of the generator;
the insulation detection control module is connected with the signal detection module and the power supply module; the insulation detection control module is used for controlling the power supply module to supply power to the winding of the generator and receiving detection parameters sent by the signal detection module so as to judge the insulation performance of the generator in real time;
The power supply module includes: a first switching unit, a rectifier and a second switching unit;
The first switch unit is connected in series between the alternating current input end of the rectifier and the power grid;
the second switch unit is connected in series between the direct current output end of the rectifier and the winding of the generator;
The first switch unit and the second switch unit are controlled by the insulation detection control module;
The power supply module is multiplexed with a slow start unit of the converter;
the generator insulation detection device further includes: the third switching unit is connected in series between the direct-current side of the converter and the direct-current output end of the rectifier; the third switch unit is controlled by the insulation detection control module.
2. The generator insulation detection device of claim 1, wherein the signal detection module comprises: a voltage transformer and a current transformer;
The voltage transformer and the current transformer are used for detecting parameters of the same phase winding or parameters of different phase windings of the generator.
3. The generator insulation detection device of claim 1, wherein the rectifier is at least one of a single phase bridge rectifier and a three phase bridge rectifier.
4. The generator insulation detection device according to claim 1, wherein the first switch unit and the second switch unit are contact switches of a contactor; the contactor is controlled by the insulation detection control module.
5. The generator insulation detection device of claim 1, wherein the generator is a direct drive generator; the power supply module is connected with a stator winding of the generator; the signal detection module is connected with a stator winding of the generator.
6. The generator insulation detection device of claim 1, wherein the generator is a doubly fed generator;
the signal detection module is connected with the rotor winding of the generator, and the power supply module is connected with the rotor winding of the generator; and/or the signal detection module is connected with the stator winding of the generator, and the power supply module is connected with the stator winding of the generator.
7. The wind power generation system is characterized by comprising a converter and a generator, wherein the generator is connected with a power grid through the converter; wherein the converter comprises a generator insulation detection device according to any one of claims 1-6, through which the generator performs insulation detection.
8. The wind power generation system of claim 7, further comprising a circuit breaker connected in series between a grid side end of the converter and the grid;
The insulation detection control module is multiplexed with the converter control module, and the circuit breaker is controlled by the insulation detection control module.
9. A generator insulation detection method, characterized in that the generator insulation detection device according to any one of claims 1 to 6 is used; the method comprises the following steps:
Controlling the power supply module to supply power to the winding of the generator;
Controlling the signal detection module to detect an output signal of the generator;
And judging the insulation performance of the generator in real time according to the detection signal sent by the signal detection module.
10. The generator insulation detection method according to claim 9, further comprising, before controlling the power supply module to supply power to the winding of the generator:
And controlling a circuit breaker between the current transformer and the power grid to be opened, and detecting whether the current transformer meets insulation detection conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111616096.0A CN114280437B (en) | 2021-12-27 | Generator insulation detection device, method and wind power generation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111616096.0A CN114280437B (en) | 2021-12-27 | Generator insulation detection device, method and wind power generation system |
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| Publication Number | Publication Date |
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| CN114280437A CN114280437A (en) | 2022-04-05 |
| CN114280437B true CN114280437B (en) | 2024-06-25 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106468763A (en) * | 2015-08-21 | 2017-03-01 | 王静爽 | A kind of online Insulation monitoring control method of motor stopping |
| CN111624486A (en) * | 2020-06-18 | 2020-09-04 | 中国船舶重工集团海装风电股份有限公司 | Online insulation detection method and device for generator of doubly-fed wind turbine generator |
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106468763A (en) * | 2015-08-21 | 2017-03-01 | 王静爽 | A kind of online Insulation monitoring control method of motor stopping |
| CN111624486A (en) * | 2020-06-18 | 2020-09-04 | 中国船舶重工集团海装风电股份有限公司 | Online insulation detection method and device for generator of doubly-fed wind turbine generator |
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