CN115940611A - IGCT converter, power supply system and overcurrent protection method - Google Patents

IGCT converter, power supply system and overcurrent protection method Download PDF

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Publication number
CN115940611A
CN115940611A CN202211483156.0A CN202211483156A CN115940611A CN 115940611 A CN115940611 A CN 115940611A CN 202211483156 A CN202211483156 A CN 202211483156A CN 115940611 A CN115940611 A CN 115940611A
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China
Prior art keywords
igct
current
wave
converter
time period
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CN202211483156.0A
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Chinese (zh)
Inventor
庄富帅
庄园
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Sungrow Power Supply Co Ltd
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Sungrow Power Supply Co Ltd
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Priority to CN202211483156.0A priority Critical patent/CN115940611A/en
Publication of CN115940611A publication Critical patent/CN115940611A/en
Priority to PCT/CN2023/092697 priority patent/WO2024108910A1/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/487—Neutral point clamped inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Inverter Devices (AREA)

Abstract

The application discloses IGCT converter, power system and overcurrent protection method, the converter includes: the power circuit, the current detection circuit and the controller; the power circuit comprises an IGCT device; the current detection circuit is used for detecting the output current of the IGCT converter; and the controller is used for sealing the wave of the IGCT device in the power circuit for a first time period and reducing the current instruction value when the output current is greater than the protection threshold, removing the sealing wave after the first time period is reached, sealing the wave again and reducing the current instruction value again when the output current is greater than the protection threshold after the sealing wave is removed. Since the switching frequency of the IGCT device is low, the switching is controlled too frequently, heat accumulation is easily caused, and the loss is increased. When the IGCT converter is in overcurrent, the current instruction value is gradually reduced, so that the output current is reduced more quickly, the output current is controlled not to be in overcurrent as soon as possible, and the protection is effectively carried out.

Description

IGCT converter, power supply system and overcurrent protection method
Technical Field
The application relates to the technical field, in particular to an IGCT converter, a power supply system and an overcurrent protection method.
Background
An Integrated Gate-Commutated Thyristor (IGCT) has a characteristic that it cannot be turned off when overcurrent occurs, and when the current is large, the turn-off voltage spike is large, which is easy to damage the device.
In addition, the IGCT generally has a low operating frequency, and if the IGCT is frequently switched, the IGCT has a switching loss, and if the IGCT is switched under a high current, heat is accumulated due to repeated operations, which puts stress on heat dissipation.
Disclosure of Invention
In view of the above, the present application provides an IGCT converter, a power supply system, and an overcurrent protection method, which can quickly suppress a rise in current when the current is overcurrent, thereby protecting an IGCT device.
The application provides an IGCT converter, including: the power circuit, the current detection circuit and the controller;
the power circuit comprises an IGCT device;
the current detection circuit is used for detecting the output current of the IGCT converter;
and the controller is used for sealing the wave of the IGCT device in the power circuit for a first time period and reducing the current instruction value when the output current is greater than the protection threshold, removing the sealing wave after the first time period is reached, sealing the wave again and reducing the current instruction value again when the output current is greater than the protection threshold after the sealing wave is removed.
Preferably, the controller is further configured to, when the number of times of wave blocking is greater than the first set number of times Nt, re-block the wave for a second time period for the IGCT device in the power circuit, where the second time period is greater than the first time period.
Preferably, the controller is further configured to reduce the current command value after the IGCT device in the power circuit is sealed for the second time period, where the reduced amplitude of the current command value is greater than a first amplitude, and the first amplitude is a maximum amplitude value of the current command value reduced when the sealing frequency is less than or equal to a first set frequency Nt.
Preferably, the controller is specifically configured to, when the number of times of wave blocking is equal to or less than a first set number of times Nt, decrease the current command value by the same magnitude each time.
Preferably, the controller is specifically configured to gradually decrease the control current command value in accordance with a slope each time when the number of times of the wave blocking is equal to or less than a first set number of times Nt.
Preferably, the controller is further configured to control the protection threshold to be gradually decreased as the number of the blocking waves increases.
Preferably, the controller is further configured to control the IGCT converter to stop when the number of wave blocking times is greater than a second set number of times Mt, where the second set number of times Mt is greater than the first set number of times Nt.
The present application also provides a power supply system comprising the IGCT converter introduced above;
and the output end of the IGCT converter is used for connecting a power grid.
The present application further provides an overcurrent protection method for an IGCT converter, where the IGCT converter includes: a current detection circuit and a power circuit; the power circuit comprises an IGCT device; the current detection circuit detects the output current of the IGCT converter;
the method comprises the following steps:
when the output current is larger than the protection threshold value, carrying out wave sealing on an IGCT device in the power circuit for a first time period, and reducing a current instruction value;
after the first time period is reached, removing the wave seal;
and when the output current is larger than the protection threshold value after the sealing is removed, sealing the wave again and reducing the current instruction value again.
Preferably, the method further comprises the following steps: and when the wave blocking times are greater than the first set times Nt, re-blocking the IGCT device in the power circuit for a second time period, wherein the second time period is greater than the first time period.
Preferably, the method further comprises the following steps: and after the IGCT device in the power circuit is subjected to wave sealing for a second time period, reducing the current instruction value, wherein the reduced amplitude of the current instruction value is larger than a first amplitude, and the first amplitude is the maximum amplitude value of the reduced current instruction value when the wave sealing frequency is smaller than or equal to a first set frequency Nt.
Preferably, the reducing the current command value specifically includes: when the wave-sealing times are less than or equal to a first set time Nt, the reduced amplitudes of the current instruction value are equal each time;
when the number of times of wave blocking is less than or equal to a first set number of times Nt, the control current command value is gradually reduced according to the slope each time.
Preferably, the method further comprises the following steps: the control protection threshold is gradually reduced as the number of wave blocking times increases.
Preferably, the method further comprises the following steps: and when the wave sealing times are greater than a second set time Mt, controlling the IGCT converter to stop, wherein the second set time Mt is greater than the first set time Nt.
Therefore, the application has the following beneficial effects:
according to the IGCT converter, when the output current is larger than the protection threshold value, the IGCT device in the power circuit is sealed for a first time period, the current instruction value is reduced, after the first time period is reached, the sealing wave is removed, when the output current is larger than the protection threshold value after the sealing wave is removed, the wave is sealed again, and the current instruction value is reduced again. Since the switching frequency of the IGCT device is low, the switching is controlled too frequently, heat accumulation is easily caused, and the loss is increased. Therefore, the wave sealing can be carried out according to the output current, the current instruction value is reduced, when the output current is larger than the protection threshold value, the wave sealing is carried out again, and the current instruction value is continuously reduced. When the IGCT converter is in overcurrent, the IGCT device is not controlled to seal waves once, the current instruction value is not changed, but is gradually reduced, so that the output current can be reduced more quickly, the output current is controlled not to be in overcurrent as soon as possible, and the IGCT device is protected timely and effectively.
Drawings
Fig. 1 is a circuit diagram of a three-phase three-level IGCT converter according to an embodiment of the present disclosure;
fig. 2 is a circuit diagram of another three-phase three-level IGCT converter according to an embodiment of the present disclosure;
fig. 3 is a circuit diagram of a single-phase three-level IGCT converter according to an embodiment of the present disclosure;
fig. 4 is a circuit diagram of another single-phase three-level IGCT converter according to an embodiment of the present disclosure;
fig. 5 is a circuit diagram of a three-phase two-level IGCT converter according to an embodiment of the present disclosure;
fig. 6 is a circuit diagram of a single-phase two-level IGCT converter according to an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of an IGCT converter according to an embodiment of the present application;
FIG. 8 is a flow chart of a method for overcurrent protection of an IGCT converter;
fig. 9 is a schematic diagram of a power supply system provided in an embodiment of the present application;
fig. 10 is a flowchart of another method for overcurrent protection of an IGCT converter according to an embodiment of the present disclosure.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the drawings are described in detail below.
The embodiment of the application does not specifically limit the working scene of the IGCT converter, and for example, the IGCT converter can be applied to the field of pumped storage and can also be applied to the field of wind power generation.
The embodiments of the present application also do not specifically limit the specific topology of the IGCT converter, and for example, the IGCT converter may be a two-level converter, a three-phase converter, or a single-phase converter. Several specific IGCT converter topologies are described below in conjunction with the figures.
Referring to fig. 1, a circuit diagram of a three-phase three-level IGCT converter according to an embodiment of the present invention is shown.
The IGCT converter shown in fig. 1 is a three-phase converter, and outputs three-phase alternating currents, i.e., a-phase AC PhA, B-phase AC PhB, and C-phase AC PhC.
Fig. 1 shows a three-level neutral-point clamp, i.e. the input neutral point NP of each phase is connected to the neutral point NP of the clamped switching tube of the bridge arm to form a voltage clamp.
Referring to fig. 2, a circuit diagram of another three-phase three-level IGCT converter according to an embodiment of the present application is shown.
Fig. 2 is different from fig. 1 in that fig. 1 shows a clamp switching tube, and fig. 2 shows a clamp diode.
Referring to fig. 3, a circuit diagram of a single-phase three-level IGCT converter according to an embodiment of the present invention is shown.
Fig. 3 differs from fig. 1 in that fig. 3 is a single-phase three-level IGCT converter.
Referring to fig. 4, a circuit diagram of another single-phase three-level IGCT converter according to an embodiment of the present application is shown.
Fig. 4 is different from fig. 2 in that fig. 4 is a single-phase three-level IGCT converter.
Referring to fig. 5, a circuit diagram of a three-phase two-level IGCT converter according to an embodiment of the present invention is shown.
The IGCT converter shown in fig. 5 is a three-phase converter, and outputs three-phase alternating current, i.e., a-phase AC PhA, B-phase AC PhB, and C-phase AC PhC.
Fig. 5 differs from fig. 1 in that fig. 5 is two-level, and fig. 1 is three-level.
Referring to fig. 6, a circuit diagram of a single-phase two-level IGCT converter according to an embodiment of the present invention is shown.
Fig. 6 differs from fig. 5 in that fig. 6 is a single-phase two-level IGCT converter.
The operation principle of an IGCT converter according to an embodiment of the present invention is described in detail below with reference to the accompanying drawings.
Referring to fig. 7, a schematic diagram of an IGCT converter according to an embodiment of the present disclosure is shown.
The IGCT converter 1000 provided in this embodiment includes: a power circuit 101, a current detection circuit 102, and a controller 103.
The power circuit 101 includes IGCT devices.
It should be understood that the IGCT device needs the controller 103 to send a driving signal to perform a switching operation, i.e. sending a wave means sending a driving signal, and blocking a wave means blocking the driving signal to stop controlling the IGCT device.
And a current detection circuit 102 for detecting the output current of the IGCT converter.
The controller 103 is configured to seal the IGCT device in the power circuit 101 for a first time period and reduce the current instruction value when the output current is greater than the protection threshold, remove the sealing after the first time period is reached, and seal the wave again and reduce the current instruction value again when the output current is greater than the protection threshold after the sealing is removed.
In actual operation of the IGCT converter, output current control is generally used as a main control for the output power of the IGCT converter, that is, a current command value is given, and a controller of the IGCT converter adopts a control algorithm to make the actual output current follow the current command value. When overcurrent faults occur, the whole system needs certain response time, an unstable state exists in the time, and in the unstable state time, if a large current instruction value is adopted, the stress damage risk of the IGCT device is also aggravated.
Therefore, according to the technical scheme provided by the embodiment of the application, as the switching frequency of the IGCT device is low, the switching of the IGCT device is controlled too frequently, heat accumulation is easily caused, and loss is increased. Therefore, the wave sealing can be carried out according to the output current, the current instruction value is reduced, when the output current is larger than the protection threshold value, the wave sealing is carried out again, and the current instruction value is continuously reduced. When the IGCT converter is in overcurrent, the IGCT device is not controlled to seal waves once, the current instruction value is not changed, but is gradually reduced, so that the output current can be reduced more quickly, the output current is controlled not to be in overcurrent as soon as possible, and the IGCT device is protected timely and effectively.
According to the technical scheme provided by the embodiment of the application, if the output current continues to be over-current after the current instruction value is reduced, the cycle number can be controlled in a circulating manner, the cycle number is not particularly limited, for example, in order to reduce the output current quickly, the cycle number can be set, and hierarchical control is performed according to the cycle number.
In addition, in order to realize rapid reduction of the output current, the current command value may be reduced to a greater extent, for example, the controller is further configured to reduce the current command value after the IGCT device in the power circuit is sealed for the second time period, where a reduced amplitude of the current command value is greater than a first amplitude, and the first amplitude is a maximum amplitude value of the current command value reduced when the sealing frequency is less than or equal to a first set frequency Nt.
The embodiment of the application does not specifically limit that when the number of times of wave blocking is less than or equal to the first set number of times Nt, the amplitude of the current instruction value is reduced each time, the amplitude of reduction each time is equal, and the amplitude of reduction each time is larger and larger. For example, nt is 5, and the current command value decreases by 2% after each block. Or, the current command value is reduced by 2% for the first time of wave sealing, by 3% for the second time of wave sealing, by 4% for the third time of wave sealing, and by 5% for the fourth time of wave sealing.
In addition, according to the technical solution provided in the embodiment of the present application, each time the current command value is reduced, the current command value may be directly reduced at one time, or may be gradually reduced according to a slope, for example, 2%, the current command value may be reduced at one time by 2%, or may be reduced according to a slope proportion of 0.25, that is, by 0.5% each time. And the controller is specifically used for controlling the current instruction value to be gradually reduced according to a slope every time when the wave blocking frequency is less than or equal to the first set frequency Nt.
Whether the protection threshold value changes is not specifically limited in the embodiment of the application, for example, the protection threshold value does not change to a fixed value in the whole overcurrent protection process. In addition, the protection process can be shortened, and the protection threshold value is reduced after overcurrent and wave-sealing are carried out. I.e. the controller, is further adapted to control the guard threshold to be gradually lowered as the number of envelope times increases.
If the wave blocking times are more, the IGCT converter still has overcurrent, in order to protect the IGCT device and the IGCT system, the IGCT converter needs to be stopped, namely the controller is used for controlling the IGCT converter to be stopped when the wave blocking times are larger than a second set time Mt, and the second set time Mt is larger than a first set time Nt.
One specific implementation is described below in conjunction with the figures.
Referring to fig. 8, a flowchart of an overcurrent protection method for an IGCT converter is shown.
S801: the output current is larger than the protection threshold, primary wave sealing is executed, and the first time period T is maintained; the reduced current command value is a% of the original current command value.
S802: and when the T time is up, the wave sealing is released, namely the wave opening is carried out. If the output current is again larger than the protection threshold, returning to S801; and the frequency of wave sealing is 1, whether the frequency of wave sealing is N is larger than a first set frequency Nt is judged, if yes, S803 is executed;
s803: and performing TL wave sealing for a second time period, wherein TL is greater than T. And (5) removing the wave blocking after the wave blocking times are increased by 1,TL, and reducing the current command value to be b% of the last current command value. b is greater than a, and a and b are both numbers greater than zero and less than 100.
S804: if the output current is again greater than the protection threshold, return is made to S803.
S805: and if the wave blocking times are greater than a second set time Mt, and Mt is greater than Nt, controlling the IGCT converter to stop.
And if the normal operation time of the IGCT converter exceeds the preset time TN, judging that the IGCT converter leaves the overcurrent fault, and resetting all counters.
The above embodiments are only described by taking the division of the wave blocking times into two stages as an example, and may also be divided into more stages. The magnitude of decrease in the current command value decreases together with the level of the number of times of wave blocking.
The IGCT converter provided by the embodiment can be used for gradually controlling the sealing wave to open the wave and reducing the current instruction value when overcurrent faults occur, so that the output current can be rapidly reduced, the damage risk of an IGCT device can be effectively reduced, and the safety of the IGCT converter is ensured to pass through an unstable stage.
In addition, when the converter works normally, namely the output current of the IGCT converter does not exceed the protection threshold value, the controller controls the output current to follow the current instruction value.
Based on the IGCT converter provided in the above embodiments, the embodiments of the present application further provide a power supply system, and the following description is provided with the accompanying drawings for detailed description.
The power supply system provided by the embodiment comprises the IGCT converter introduced in any one of the above embodiments;
and the output end of the IGCT converter is used for connecting a power grid.
The embodiments of the present application do not specifically limit the voltage level of the power grid, for example, a voltage level of several kilovolts to ten and several kilovolts. For example in the field of wind power generation or pumped storage.
Because the IGCT converter can quickly and safely pass over the overcurrent fault, the safe operation of a power supply system can be ensured.
Referring to fig. 9, the figure is a schematic diagram of a power supply system according to an embodiment of the present application.
Taking a three-phase two-level power supply system as an example, because the voltage of the power grid is high, it is necessary that the output voltage of the IGCT converter in the power supply system is also high, and therefore, each phase may include a plurality of converter arm circuits shown in fig. 6 connected in series, as shown in fig. 9, and the AC output terminals are AC PhA, AC PhB, and AC PhC, respectively.
Based on the IGCT converter and the power supply system provided in the above embodiments, the embodiments of the present application further provide a power supply system, and the following description is provided with the accompanying drawings for detailed description.
Referring to fig. 9, it is a flowchart of an overcurrent protection method for an IGCT converter according to an embodiment of the present disclosure.
In the overcurrent protection method for the IGCT converter provided in this embodiment, the IGCT converter includes: a current detection circuit and a power circuit; the power circuit comprises an IGCT device; the current detection circuit detects the output current of the IGCT converter;
the method comprises the following steps:
s901: when the output current is larger than the protection threshold value, wave sealing is carried out on an IGCT device in the power circuit for a first time period, and a current instruction value is reduced;
s902: after the first time period is reached, removing the wave seal;
s903: and when the output current is larger than the protection threshold value after the sealing is removed, sealing the wave again and reducing the current instruction value again.
According to the technical scheme provided by the embodiment of the application, as the switching frequency of the IGCT device is low, the switching of the IGCT device is controlled too frequently, heat accumulation is easily caused, and loss is aggravated. Therefore, the current instruction value can be reduced according to the output current, and when the output current is larger than the protection threshold value, the current instruction value is reduced continuously by sealing the wave again. When the IGCT converter is in overcurrent, the IGCT device is not controlled to seal waves once, the current instruction value is not changed, but is gradually reduced, so that the output current can be reduced more quickly, the output current is controlled not to be in overcurrent as soon as possible, and the IGCT device is effectively protected in time.
The method provided by the embodiment further comprises the following steps:
and when the wave blocking times are greater than the first set times Nt, wave blocking is carried out on the IGCT device in the power circuit again for a second time period, and the second time period is greater than the first time period.
The method provided by the embodiment further comprises the following steps:
and after the IGCT device in the power circuit is subjected to wave sealing for a second time period, reducing the current instruction value, wherein the reduced amplitude of the current instruction value is larger than a first amplitude, and the first amplitude is the maximum amplitude value of the reduced current instruction value when the wave sealing frequency is smaller than or equal to a first set frequency Nt.
The method provided by the embodiment of the invention for reducing the current instruction value specifically comprises the following steps:
when the wave-sealing times are less than or equal to a first set time Nt, the reduced amplitudes of the current instruction value are equal each time;
when the number of times of wave blocking is less than or equal to a first set number of times Nt, the control current command value is gradually reduced according to the slope each time.
The method provided by the embodiment further comprises the following steps: the control protection threshold is gradually reduced as the number of wave blocking times increases.
The method provided by the embodiment further comprises the following steps: and when the wave blocking times are greater than a second set time Mt, controlling the IGCT converter to stop, wherein the second set time Mt is greater than the first set time Nt.
The overcurrent protection method for the IGCT converter provided in this embodiment can gradually control the sealing wave to open the wave and reduce the current instruction value when an overcurrent fault occurs, so as to quickly reduce the output current, effectively reduce the damage risk of the IGCT device, and ensure that the IGCT converter safely passes through an unstable stage.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. For the system or the device disclosed by the embodiment, the description is simple because the system or the device corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (14)

1. An IGCT converter, comprising: the device comprises a power circuit, a current detection circuit and a controller;
the power circuit includes an IGCT device;
the current detection circuit is used for detecting the output current of the IGCT converter;
the controller is configured to seal the wave for a first time period and reduce the current instruction value for the IGCT device in the power circuit when the output current is greater than the protection threshold, remove the sealing after the first time period is reached, and seal the wave again and reduce the current instruction value again when the output current is greater than the protection threshold after the sealing is removed.
2. The IGCT converter of claim 1, wherein the controller is further configured to re-clamp the IGCT devices in the power circuit for a second time period when the clamping frequency is greater than a first set frequency Nt, the second time period being greater than the first time period.
3. The IGCT converter according to claim 2, wherein the controller is further configured to reduce the current command value after the IGCT device in the power circuit is blocked for the second time period, wherein the reduced current command value is larger than a first amplitude, and the first amplitude is a maximum value of the amplitude of the current command value reduced when the blocking frequency is equal to or less than the first set frequency Nt.
4. The IGCT converter according to claim 2 or 3, wherein the controller is configured to decrease the current command value by an equal magnitude each time the blocking frequency is equal to or less than the first predetermined frequency Nt.
5. The IGCT converter of claim 2 or 3, wherein the controller is configured to control the current command value to be gradually decreased in a slope each time when the number of the blocking times is equal to or less than the first set number of times Nt.
6. The IGCT converter according to any of claims 1-5, wherein the controller is further configured to control the protection threshold to be gradually decreased as the number of envelope cycles increases.
7. The IGCT converter according to any of claims 2-6, wherein the controller is further configured to control the IGCT converter to stop when the number of blocking waves is larger than a second set number Mt, which is larger than the first set number Nt.
8. A power supply system comprising an IGCT converter as claimed in any one of claims 1 to 7;
and the output end of the IGCT converter is used for connecting a power grid.
9. An overcurrent protection method for an IGCT converter, the IGCT converter comprising: a current detection circuit and a power circuit; the power circuit includes an IGCT device; the current detection circuit detects the output current of the IGCT converter;
the method comprises the following steps:
when the output current is larger than a protection threshold value, carrying out wave sealing on an IGCT device in the power circuit for a first time period, and reducing a current instruction value;
removing the wave seal after the first time period is reached;
and when the output current is larger than the protection threshold value after the sealing is removed, sealing the wave again and reducing the current instruction value again.
10. The method of claim 9, further comprising:
and when the wave blocking times are greater than the first set times Nt, re-blocking the IGCT device in the power circuit for a second time period, wherein the second time period is greater than the first time period.
11. The method of claim 10, further comprising:
and after the IGCT device in the power circuit is subjected to wave sealing for the second time period, reducing the current instruction value, wherein the reduced amplitude of the current instruction value is larger than a first amplitude, and the first amplitude is the maximum amplitude value of the current instruction value reduced when the wave sealing frequency is smaller than or equal to the first set frequency Nt.
12. The method according to claim 10 or 11, wherein the reducing the current command value specifically includes:
when the frequency of wave blocking is less than or equal to the first set frequency Nt, the amplitude of the current instruction value reduced every time is equal;
and when the wave blocking times are less than or equal to the first set times Nt, controlling the current instruction value to be gradually reduced according to a slope each time.
13. The method of any one of claims 9-12, further comprising: and controlling the protection threshold value to be gradually reduced along with the increase of the wave blocking times.
14. The method according to any one of claims 9-12, further comprising: and when the wave sealing times are greater than a second set time Mt, controlling the IGCT converter to stop, wherein the second set time Mt is greater than the first set time Nt.
CN202211483156.0A 2022-11-24 2022-11-24 IGCT converter, power supply system and overcurrent protection method Pending CN115940611A (en)

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CN104377659B (en) * 2013-08-16 2018-01-02 力博特公司 Seal ripple deblocking wave method and device, deblocking wave method and device and inverter circuit
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