CN114280437A - Generator insulation detection device and method and wind power generation system - Google Patents
Generator insulation detection device and method and wind power generation system Download PDFInfo
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Abstract
The embodiment of the invention discloses a generator insulation detection device and 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 the 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 the 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 on 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 a new energy power station is rapidly increased. Accordingly, the influence of safe and stable operation of the new energy power station on stable operation of a 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 the safe use of the generator, and particularly, the generator cannot be used due to low or unqualified insulation performance.
Taking a wind driven generator as an example, in the prior art, an insulation detection method for the wind driven generator is that a stator cable between the generator and a converter is removed, insulation resistance of a motor is measured by using insulation withstand voltage test equipment, and insulation performance of the generator cannot be detected on line in real time. Therefore, the frequency of insulation detection on the generator winding is low, and the working health state of the generator cannot be effectively predicted. Once the insulation failure of the generator winding can cause the generator set to be incapable of running, and in addition, the generator of the wind generating set is positioned at the position of the engine room, so that the difficulty in maintenance and replacement is high, and the great economic loss is caused.
Disclosure of Invention
The embodiment of the invention provides a generator insulation detection device and method and a wind power generation system, which are used for realizing real-time detection and prejudgment on the insulation performance of a generator winding and improving the running reliability of a generator.
In a first aspect, an embodiment of the present invention provides a generator insulation detection apparatus, including:
the signal detection module is used for detecting an 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 comprises: a first switching unit, a rectifier and a second switching unit;
the first switching unit is connected between the alternating current input end of the rectifier and a power grid in series;
the second switching unit is connected in series between the direct current output end of the rectifier and the winding of the generator;
the first switching unit and the second switching 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 both 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 comprises: a third switching unit connected in series between a dc side of the converter and a dc output of the rectifier; the third switching 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 a 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 a 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 is subjected to insulation detection through the generator insulation detection device.
Optionally, the wind power generation system further comprises a circuit breaker connected in series between the 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.
In a third aspect, an embodiment of the present invention further provides a generator insulation detection method, where a generator insulation detection apparatus according to any embodiment of the present invention is adopted; the method comprises the following steps:
controlling the power supply module to supply power to a 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 includes:
and controlling a breaker between the converter and the power grid to be disconnected, and detecting whether the converter meets an insulation detection condition.
The embodiment of the invention provides a generator insulation detection device capable of detecting and prejudging 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 the 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, a stator cable between the generator and the converter does not need to be dismantled, so that the generator can be favorably detected in real time for insulation performance, 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 of great economic loss caused by the failure of the insulation of the generator winding which can cause the generator set to be incapable of running, and the running 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 generator insulation detection device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another generator insulation detection device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another generator insulation detection device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another generator insulation detection device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another generator insulation detection device according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another generator insulation detection device according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of a wind power generation system according to an embodiment of the present invention;
FIG. 9 is a schematic structural view of another wind power generation system provided by an embodiment of the present invention;
FIG. 10 is a schematic structural view of another wind power generation system provided in accordance with an embodiment of the present invention;
FIG. 11 is a schematic structural view of another wind power generation system according to an embodiment of the present invention;
FIG. 12 is a schematic structural view of another wind power generation system according to an embodiment of the present invention;
fig. 13 is a schematic flow chart of a generator insulation detection method according to an embodiment of the present invention;
fig. 14 is a schematic flow chart of another generator insulation detection method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
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 detecting apparatus includes: signal detection module 11, power supply module 12 and insulation detection control module 13. The signal detection module 11 is used for detecting an output parameter of the generator 20; the power supply module 12 is connected with the winding 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 winding 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 transformer, a sensor, an ammeter, a voltmeter, or the like, which can detect an output parameter of the generator 20. Illustratively, the generator insulation detection device operates by controlling the power supply module to provide a detection voltage to the windings of the generator 20 when the generator set is shut down. At this time, if the winding of the generator 20 has a voltage, and the generator 20 is well insulated, the voltage will not form a loop, so that the current detected by the signal detection module 11 is close to zero (i.e. the equivalent resistance is close to infinity), and accordingly, the insulation detection control module 13 can determine that the starting motor 20 has no insulation problem according to the received output parameters. Conversely, if the generator 20 has an insulation problem, that is, if the generator 20 has a leakage, a leakage path is formed, and the current detected by the signal detection module 11 is large (that is, the equivalent resistance is small), accordingly, the insulation detection control module 13 can determine that the starting motor 20 has an insulation problem according to the received output parameters.
In summary, the embodiment of the present invention provides a generator insulation detection apparatus capable of detecting and pre-judging the insulation performance of a generator 20 in real time, and the apparatus includes 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, a stator cable between the generator and the converter does not need to be dismantled, so that the generator can be favorably detected in real time for insulation performance, 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 of great economic loss caused by the failure of the insulation of the generator winding which can cause the generator set to be incapable of running, and the running reliability of the generator is improved.
In addition to the above embodiments, there are various specific arrangement modes of the signal detection module 11, the power supply module 12 and the insulation detection control module 13, and the following description is exemplary, but not limiting the present invention.
Fig. 2 is a schematic structural diagram of another generator insulation detection device according to an embodiment of the present invention. Referring to fig. 2, in an embodiment of the present invention, optionally, the signal detection module 11 includes: a voltage transformer PT and a current transformer CT; the potential 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 divided into an a-phase stator winding, a B-phase stator winding, and a C-phase stator winding. The voltage transformer PT and the current transformer CT are used for detecting 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, and the current transformer CT detects the C-phase stator winding, and other conditions are similar and are not repeated.
Because the windings of the generator 20 are generally Y-connected or delta-connected, and the windings of different phases are connected, if one phase of the windings has voltage and current, the other two phases of the windings 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 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 present invention, the generator 20 is optionally a direct drive generator. The power supply module 12 is connected with a stator winding of the generator 20; the signal detection module 11 is connected to the stator winding of the generator 20. The direct-drive generator is connected with the converter side power module through the converter side power module and the converter grid side power module.
Illustratively, the stator winding of the direct-drive generator is connected with the converter power module (including the machine-side power module and the grid-side power module) through a copper bar, and the power supply module 12 can be directly connected with the stator wiring copper bar to provide the detection voltage for the generator 20. Correspondingly, the current transformer CT and the voltage transformer PT respectively detect the current and the voltage on the wiring copper bar. In practical applications, the signal detection module 11 may also be configured to include only the current transformer CT. If the generator 20 is well insulated, the voltage on the winding will not form a loop, and the current on the wiring copper bar detected by the current transformer CT is close to zero (i.e. the equivalent resistance is close to infinity). Conversely, if the generator 20 has an insulation problem, i.e. the generator 20 has a leakage, the voltage on the copper connecting bar can form a leakage path, and the current transformer CT detects a large current (i.e. a small equivalent resistance) on the winding of the generator 20. Therefore, in the embodiment of the present invention, the power supply module 12 and the signal detection module 11 are both connected to 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 generator insulation detection device according to an embodiment of the present invention. Referring to fig. 3, in one embodiment of the present invention, the generator 20 is optionally a doubly fed generator. The power supply module 12 is connected with a rotor winding of the generator 20, and the signal detection module 11 is connected with the rotor winding of the generator 20. And/or the power supply module 12 is connected with a stator winding of the generator 20, and the signal detection module 11 is connected with the stator winding of the generator 20. The frequency, voltage, amplitude and phase of a rotor winding power supply are automatically adjusted by the converter according to the operation requirements, and the generator set can realize constant-frequency power generation at different rotating speeds, thereby meeting the requirements of power utilization loads and grid connection. Therefore, for the double-fed generator, the stator winding and the rotor winding of the double-fed generator both have copper bars of external circuits and have external conditions.
Specifically, fig. 3 exemplarily shows that the power supply module 12 is connected to the rotor winding of the generator 20, and 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 supply module 12 may be connected to a stator winding of the generator 20, and the voltage sensor PT and the current sensor CT are both connected to the stator winding of the generator 20. The stator winding and the rotor winding of the generator 20 can be connected with the power supply module 12, and the stator winding and the rotor winding of the generator 20 are connected with the voltage sensor PT and the current sensor CT. Compared with a stator winding of a doubly-fed generator, the current of a 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, the reduction of the rated current of the current sensor CT is facilitated, and the cost of the whole machine is reduced.
Fig. 4 is a schematic structural diagram of another generator insulation detection device according to an embodiment of the present invention. Referring to fig. 4, in one embodiment of the present invention, the power supply module 12 optionally includes: a first switching unit 121, a rectifier 122, and a second switching unit 123. The first switching unit 121 is connected in series between the ac input of the rectifier 122 and the grid; the second switching unit 123 is connected in series between the dc output terminal of the rectifier 122 and the winding of the generator 20; the first switching unit 121 and the second switching unit 123 are controlled by the insulation detection control module 13.
The rectifier 122 is capable of rectifying ac power of the grid into dc power, and provides the voltage detected by the insulation detection to the generator 20. Illustratively, when insulation detection of the generator 20 is required, the insulation detection control module 13 controls the first switch unit 121 and the second switch unit 123 to close to provide 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 switching unit 121 and the second switching unit 123 to be turned off. The first switch unit 121 is arranged in the embodiment of the invention, so that the condition that the power grid supplies voltage to the rectifier when the generator insulation detection is not carried out is avoided; the provision of the second switching unit 123 avoids the generator 20 providing voltage to the generator windings when no generator insulation detection is performed. Therefore, the first switch unit 121 and the second switch unit 123 are arranged to avoid potential safety hazards caused by electrification in the non-operating state of the converter.
In the above embodiments, the rectifier 122 may be a single-phase bridge rectifier or a three-phase bridge rectifier; the specific form of the rectifier 122 may be desired in practical applications.
Fig. 5 is a schematic structural diagram of another generator insulation detection device 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. Wherein, three-phase bridge rectifier 122's rectification effect is better, and output voltage waveform is steady, is favorable to promoting to carry out the accuracy that insulation detected to generator 20.
With continued reference to fig. 5, optionally, the power supply module 12 further includes a current limiting resistor R1, the current limiting resistor R1 being connected in series between the first switching 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 for limiting the current of the three-phase lines.
Fig. 6 is a schematic structural diagram of another generator insulation detection device according to an embodiment of the present invention. Referring to fig. 6, in one embodiment of the present invention, the rectifier 122 is optionally a single phase bridge rectifier. The ac side of the rectifier 122 may be connected to phases a and B of the power grid, may also be connected to phases a and C of the power grid, and may also be connected to phases B and C 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 has a simple circuit structure and is beneficial to reducing the cost.
With continued reference to fig. 6, optionally, the power supply module 12 further includes a current limiting resistor R1, the current limiting resistor R1 being connected in series between the first switching 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 for limiting the current of two phases of wires.
With continued reference to fig. 5 and 6, on the basis of the above embodiments, optionally, both the first switch unit 121 and the second switch unit 123 are contact switches of a contactor; the contactor is controlled by an insulation detection control module 13. The insulation detection control module 13 may control whether the coil of the contactor is energized, so as to control the actuation and the disconnection of the contact switch of the contactor.
Fig. 7 is a schematic structural diagram of another generator insulation detection device according to an embodiment of the present invention. Referring to fig. 7, on the basis of the above embodiments, the power supply module 12 is optionally multiplexed with the slow start unit of the converter. 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 dc voltage. Unlike the power supply module 12, the slow start unit is electrically connected to the dc side of the converter, so that the dc side is charged before the converter normally operates, thereby ensuring that the converter can be normally started.
Based on this, the generator insulation detection device provided in the embodiment of the present invention further includes: and a third switching unit 19, wherein the third switching unit 19 is connected in series between the direct current side of the converter and the direct current output end of the rectifier 122, and the third switching unit 19 is controlled by the insulation detection control module 13. Alternatively, the third switching unit 19 is a contact switch of a contactor. Illustratively, the third switching unit 19 works on the principle that when the generator winding is insulated normally, the insulation detection control module 13 controls the third switching unit 19 to pull in, 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 switching unit 19 to be turned off when the converter is normally operated, 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 attracted, the second switch unit 123 to be attracted and the third switch unit 19 to be disconnected, so that the insulation detection function can be performed when the converter does not work. Therefore, the embodiment of the present invention realizes the multiplexing of the insulation detection function and the start-up function by adding the second switching unit 123 and the third switching unit 19. By means of the arrangement, the first switch unit 121 and the rectifier 122 do not need to be additionally designed, and compared with the prior art, the insulation detection control module is equivalently provided with only the second switch unit 123, the third switch unit 19 and the insulation detection control module 13, so that the effect of real-time insulation detection is achieved with small change, and cost reduction is facilitated.
On the basis of the above embodiments, optionally, the insulation detection control module 13 is multiplexed with the converter control module. The converter control module is a device for controlling the converter in the power generation system. Specifically, the related functions of the insulation detection control module 13 may be added to the converter control module to realize multiplexing of the insulation detection control module 13 and the converter control module, and the insulation detection control module does not need to be additionally provided. Compared with the prior art, the effect of real-time insulation detection is realized by only additionally arranging the second switch unit 123 and the third switch unit 19 with small change, thereby being beneficial to reducing the cost.
In summary, the embodiment of the invention realizes the function of detecting the insulation performance of the generator in real time by slightly modifying the power generation system, does not need to dismantle a stator cable between the generator and the converter, does not influence the grid-connected operation of the wind turbine generator for a long time, and improves the reliability of the operation 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, and the generator 20 is connected to the grid through the converter 10; the converter 10 includes the generator insulation detection device provided in 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 again.
In the above embodiments, the specific implementation manners of the converter 10 and the generator 20 are various, and optionally, 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, optionally, the power supply module 12 is multiplexed with the slow start unit of the converter. The generator insulation detection device further comprises: and a third switching unit 19, wherein the third switching unit 19 is connected in series between the direct current side of the converter and the direct current output end of the rectifier 122, and the third switching 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 comprises 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 breaker Q1 is controlled by the insulation detection control module 13. The arrangement is favorable for controlling the converter to stop at any time to monitor the insulation of the generator. At this time, for the doubly-fed converter, 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 effect of real-time insulation detection is realized by only additionally arranging the second switch unit 123 and the third switch unit 19 with small change, thereby being beneficial to reducing the cost. And by adopting the embodiment of the invention, the condition is provided for insulation detection by timely controlling the breaker Q1 to be disconnected under various conditions of 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 connected to the insulation detection control module 13 in a communication manner.
With continued reference to fig. 9-12, the wind power generation system optionally further includes a box-to-box substation 40, the box-to-box substation 40 being connected in series between the grid 30 and the circuit breaker Q1. The box substation 40, i.e. a box substation, is used to match the connection between the grid 30 and the converters.
With continued reference to fig. 9-12, optionally, the current transformer comprises: the grid-side filter 14, the grid-side power module 15, the filter capacitor C1, the machine-side power module 16 and the machine-side power module 17 are connected in series between the circuit breaker Q1 and the generator 20. For a doubly-fed converter, the converter further comprises: a grid side contactor KM4 connected in series between the breaker Q1 and the grid side filter 14, and a stator contactor KM5 connected in series between the 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 generator insulation detection method according to an embodiment of the present invention. Referring to fig. 13, the generator insulation detection method includes the steps of:
and 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 includes: and controlling a breaker between the converter and the power grid to be disconnected, and detecting whether the converter meets an insulation detection condition.
And S120, detecting the output parameters of the generator by the signal detection module.
And S130, judging the insulation performance of the generator in real time according to the detection parameters sent by the signal detection module.
Alternatively, in conjunction with fig. 9-12, the power supply module 12 is multiplexed with the slow start unit of the converter, and the insulation detection control module 13 is multiplexed with the converter control module. S110 and S120 may be executed by the insulation detection control module 13, and S130 may be executed by the insulation detection control module 13, or may be executed by the main control system 50.
Fig. 14 is a schematic flow chart of another generator insulation detection method according to an embodiment of the present invention. Referring to fig. 14, optionally, the generator insulation detection method comprises the steps of:
s210, the main control system sends an insulation detection command to an insulation detection control module (a converter control module).
S220, self-checking the current transformer, and judging whether insulation detection conditions are met; if yes, go to 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, the circuit breaker Q1 is controlled to open, so that the generator 20 is disconnected from the grid 30. Meanwhile, the insulation detection control module 13 (current transformer control module) detects the state of the breaker Q1, determines that the breaker Q1 is in an open state, and meets the insulation detection condition, thereby completing the self-detection of the current transformer. If the closing state is confirmed, the insulation detection condition is not met, and further judgment is needed.
And S230, controlling the slow starting unit to operate by an insulation detection control module (a converter control module), and outputting insulation detection voltage to the generator.
Specifically, the insulation detection control module (converter control module) 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. The grid side voltage is rectified into a direct current voltage through a current limiting resistor + rectifier bridge structure and then output to the winding 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.
And S250, converting the voltage signal and the current signal into impedance by an insulation detection control module (a converter control module), and transmitting the impedance to a main control system.
S260, the master control system judges whether the acquired impedance is larger than a preset impedance; if yes, go to S270; otherwise, S280 is performed.
And S270, judging that the generator is normal, sending a normal working command to an insulation detection control module (a converter control module) by the main control system, and switching the converter to a normal power generation mode.
And S280, judging that the generator has an insulation fault, and early warning.
S290, judging whether other conditions which do not meet the insulation detection condition exist; if yes, stopping the machine; otherwise, return to S220.
Therefore, through S210-S290, insulation detection of the generator 20 is achieved, a stator cable of the generator 20 does not need to be dismantled, insulation performance of the generator 20 can be judged in advance on line, and grid-connected operation of the wind turbine generator is not affected for a long time. In addition, the embodiment of the invention can perform online detection on the insulation performance of the winding of the generator 20 under various conditions such as startup, standby or shutdown of the generator set.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. 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, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (13)
1. A generator insulation detection device, 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 the detection parameters sent by the signal detection module so as to judge the insulation performance of the generator in real time.
2. The generator insulation detection device of claim 1, wherein the power supply module is multiplexed with a slow start unit of the converter.
3. 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.
4. The generator insulation detection device of claim 1, wherein the power supply module comprises: a first switching unit, a rectifier and a second switching unit;
the first switching unit is connected between the alternating current input end of the rectifier and a power grid in series;
the second switching unit is connected in series between the direct current output end of the rectifier and the winding of the generator;
the first switching unit and the second switching unit are controlled by the insulation detection control module.
5. The generator insulation detection device of claim 4, wherein the rectifier is at least one of a single-phase bridge rectifier and a three-phase bridge rectifier.
6. The generator insulation detection device according to claim 4, wherein the first switch unit and the second switch unit are both contact switches of a contactor; the contactor is controlled by the insulation detection control module.
7. The generator insulation detection device according to claim 4, wherein the power supply module is multiplexed with a slow start unit of a converter;
the generator insulation detection device further comprises: a third switching unit connected in series between a dc side of the converter and a dc output of the rectifier; the third switching unit is controlled by the insulation detection control module.
8. 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.
9. The generator insulation detection device of claim 1, wherein the generator is a doubly fed generator;
the signal detection module is connected with a 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 a stator winding of the generator, and the power supply module is connected with the stator winding of the generator.
10. A 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 1-8, and the generator is insulation detected by the generator insulation detection device.
11. The wind power generation system of claim 10, further comprising a circuit breaker connected in series between the 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.
12. A generator insulation detection method, characterized by using the generator insulation detection device according to any one of claims 1 to 9; the method comprises the following steps:
controlling the power supply module to supply power to a 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.
13. The generator insulation detection method of claim 12, further comprising, before controlling the power supply module to supply power to the windings of the generator:
and controlling a breaker between the converter and the power grid to be disconnected, and detecting whether the converter meets an insulation detection condition.
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