CN109245503B - Bypass circuit and control method thereof - Google Patents
Bypass circuit and control method thereof Download PDFInfo
- Publication number
- CN109245503B CN109245503B CN201811086057.2A CN201811086057A CN109245503B CN 109245503 B CN109245503 B CN 109245503B CN 201811086057 A CN201811086057 A CN 201811086057A CN 109245503 B CN109245503 B CN 109245503B
- Authority
- CN
- China
- Prior art keywords
- thyristor
- diode
- voltage
- relay
- driving circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims description 21
- 238000006243 chemical reaction Methods 0.000 abstract description 11
- 230000001960 triggered effect Effects 0.000 description 11
- 230000015556 catabolic process Effects 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 101150052863 THY1 gene Proteins 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
Images
Classifications
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Power Conversion In General (AREA)
Abstract
The invention discloses a bypass circuit and a control method thereof, wherein the bypass circuit comprises: the anode end of the first thyristor is connected with the first output end of the commutation module, and the cathode end of the first thyristor is connected with the second output end of the commutation module; the anode end of the second thyristor is connected with the second output end of the commutation module, and the cathode end of the second thyristor is connected with the first output end of the commutation module; a first driving circuit connected to an anode terminal and a gate terminal of the first thyristor, respectively; the second driving circuit is respectively connected with the anode end and the gate end of the second thyristor, and the controller is respectively connected with the first driving circuit and the second driving circuit. The invention utilizes the bypass circuit to carry out the current conversion module with the fault caused by the bypass, not only can save the occupied space and reduce the cost, but also can obviously improve the response speed of the bypass and can quickly bypass the current conversion module with the fault all the time. The bypass circuit of the present invention also has good mechanical properties.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a bypass circuit and a control method thereof.
Background
The converter equipment is a core device in the field of power electronics, wherein converter valves or converters are more common. The converter equipment generally obtains a desired dc voltage and achieves power control by connecting the three-phase ac voltage to its dc terminals in turn. The bypass device is mainly used when the voltage at two ends of the commutation module exceeds a certain threshold value, namely the commutation module generates overvoltage, the bypass device can prevent the commutation module from being damaged due to overvoltage, and meanwhile, the bypass device can bypass the failed commutation module after the commutation module fails. Therefore, the bypass device in the converter equipment can reliably act in the converter circuit to ensure the safe operation of the converter equipment.
At present, a bypass mode of a traditional converter device generally utilizes a mechanical bypass switch to bypass the converter device with a fault, and because the mechanical bypass switch has a large volume, a certain occupied space is obviously increased when the mechanical bypass switch is installed in a converter circuit, and the cost of the mechanical bypass switch is high. The mechanical bypass switch generally has five to ten milliseconds of action time, has slow action response speed, cannot rapidly cut off the failed converter equipment in time, is easy to cause the converter equipment to be damaged, has more abrasion, and can not continuously bypass the failed converter equipment during the positive and negative half cycles of alternating current once the mechanical bypass switch is in poor contact, thereby influencing the reliable operation of the converter equipment.
Disclosure of Invention
Therefore, the technical problem to be solved by the embodiments of the present invention is that in the bypass mode in the prior art, a mechanical bypass switch is used to bypass a converter device with a fault, so that on one hand, the size is large, the cost is high, and on the other hand, the response speed is slow.
Therefore, the embodiment of the invention provides the following technical scheme:
an embodiment of the present invention provides a bypass circuit, including:
the anode end of the first thyristor is connected with the first output end of the commutation module, and the cathode end of the first thyristor is connected with the second output end of the commutation module;
the anode end of the second thyristor is connected with the second output end of the commutation module, and the cathode end of the second thyristor is connected with the first output end of the commutation module;
a first driving circuit connected to an anode terminal and a gate terminal of the first thyristor, respectively;
and the second driving circuit is respectively connected with the anode end and the gate electrode end of the second thyristor.
And the controller is respectively connected with the first driving circuit and the second driving circuit.
Optionally, the first driving circuit further comprises: a first diode and a first relay;
the positive pole end of the first diode is connected with the anode end of the first thyristor, the negative pole end of the first diode is connected with the gate pole end of the first thyristor, one end of the first relay is connected with the positive pole end of the first diode, and the other end of the second relay is connected with the negative pole end of the first diode.
Optionally, the second driving circuit comprises: a second diode and a second relay;
the positive terminal of the second diode is connected with the positive terminal of the second thyristor, the negative terminal of the second diode is connected with the gate terminal of the second thyristor, one end of the second relay is connected with the positive terminal of the second diode, and the other end of the second relay is connected with the negative terminal of the second diode.
Optionally, the bypass circuit further includes:
and the first filter circuit comprises a first resistor and a first capacitor, one end of the first resistor is respectively connected with the negative electrode end of the first diode and one end of the first capacitor, and the other end of the first resistor is respectively connected with the other end of the first capacitor and the cathode end of the first thyristor.
Optionally, the bypass circuit further includes:
and the second filter circuit comprises a second resistor and a second capacitor, one end of the second resistor is respectively connected with the cathode end of the second diode and one end of the second capacitor, and the other end of the second resistor is respectively connected with the other end of the second capacitor and the cathode end of the second thyristor.
Optionally, the first relay and the second relay are respectively connected with the controller.
The embodiment of the invention provides a control method of a bypass circuit, which comprises the following steps:
when the output voltage of the commutation module is a forward voltage, if the forward voltage is greater than or equal to a forward preset voltage of the first drive circuit, controlling the first drive circuit to execute work so that the commutation module is bypassed, and respectively controlling the second relay in the second drive circuit to be in a conducting state in advance and the first relay in the first drive circuit to be in a conducting state in advance;
when the output voltage of the commutation module is a reverse voltage, if the reverse voltage is greater than or equal to a reverse preset voltage of the second drive circuit, controlling the second drive circuit to execute work so that the commutation module is bypassed, and controlling the first relay in the first drive circuit to be in a conducting state in advance and the second relay in the second drive circuit to be in a conducting state in advance.
Optionally, the forward preset voltage of the first driving circuit is a threshold voltage of the first diode, and the reverse preset voltage of the second driving circuit is a threshold voltage of the second diode.
The technical scheme of the embodiment of the invention has the following advantages:
the invention discloses a bypass circuit and a control method thereof, wherein the bypass circuit comprises: the anode end of the first thyristor is connected with the first output end of the commutation module, and the cathode end of the first thyristor is connected with the second output end of the commutation module; the anode end of the second thyristor is connected with the second output end of the commutation module, and the cathode end of the second thyristor is connected with the first output end of the commutation module; a first driving circuit connected to an anode terminal and a gate terminal of the first thyristor, respectively; the second driving circuit is respectively connected with the anode end and the gate end of the second thyristor, and the controller is respectively connected with the first driving circuit and the second driving circuit. The invention utilizes the bypass circuit to carry out the current conversion module with the fault caused by the bypass, not only can save the occupied space and reduce the cost, but also can obviously improve the response speed of the bypass and can quickly bypass the current conversion module with the fault all the time. The bypass circuit of the present invention also has good mechanical properties.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a circuit schematic of a bypass circuit in an embodiment of the present invention;
FIG. 2 is a first waveform illustrating the operation of the bypass circuit according to the embodiment of the present invention;
FIG. 3 is a second waveform illustrating the operation of the bypass circuit according to the embodiment of the present invention;
FIG. 4 is a flowchart illustrating a method for controlling a bypass circuit according to an embodiment of the present invention.
Reference numerals:
1-a current conversion module; 2-a first bypass module; 21-a first thyristor;
22-a first drive circuit; 221-a first diode; 222-a first relay;
23- -a first filter circuit; 231-a first resistance; 232-a first capacitance;
3-a second bypass module; 31-a second thyristor; 32-a second drive circuit;
321-a second diode; 322-a second relay; 33-a second filter circuit;
331-a second resistance; 332-a second capacitance; 4-a controller.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
An embodiment of the present invention provides a bypass circuit, and as shown in fig. 1, the bypass circuit in this embodiment is mainly used for bypassing a converter module 1 that has a fault. The current conversion module 1 is configured to convert ac output by a power grid into dc, where the current conversion module 1 is mainly used in a flexible dc power transmission control system and may convert ac output by the power grid into dc, and certainly, the current conversion module 1 may also convert dc into ac, where the current conversion module 1 is used in a flexible dc power grid, so that the current conversion module 1 is configured to convert three-phase ac voltage output by the power grid into dc voltage, that is, dc desired by a user may be obtained through the current conversion module 1.
In fig. 1, the bypass circuit in this embodiment mainly includes: a first thyristor 21, a second thyristor 31, a first drive circuit 22, a second drive circuit 32, and a controller 4.
The first Thyristor 21(Thyristor) is a half-controlled device in a power electronic device, and may also be referred to as a silicon controlled rectifier, and the first Thyristor 21 may operate under a high-voltage and high-current condition. The first thyristor 21 comprises three electrodes, an anode (a), a cathode (K) and a gate (G) of the first thyristor 21. In fig. 1, the first thyristor 21 has its anode terminal (a) connected to the first output terminal a of the commutation module 1 and its cathode terminal (K) connected to the second output terminal b of the commutation module 1. The first thyristor 21 is Thy1 in fig. 1.
The second Thyristor 31(Thyristor) is a half-controlled device in a power electronic device, which may also be called a silicon controlled rectifier, and the first Thyristor 21 may operate under a high voltage and large current condition. The second thyristor 31 comprises three electrodes, namely an anode (a), a cathode (K) and a gate (G) of the second thyristor 31. In fig. 1, the anode terminal (a) of the second thyristor 31 is connected to the second output terminal b of the commutation module 1, and the cathode terminal (K) thereof is connected to the first output terminal a of the commutation module 1. In fig. 1, the second thyristor 31 is Thy 2.
The first and second thyristors 21 and 31 in the above description may be replaced with IGBT devices or insulated gate bipolar transistors (MOSFETs). The gate of the first thyristor 21 or the second thyristor 31 is turned on under the condition that the gate is under the forward voltage, i.e. the gate has the trigger current. If the gate is subject to a reverse voltage, the first thyristor 21 or the second thyristor 31 is in a reverse blocking state.
And a first driving circuit 22 connected to the anode terminal and the gate terminal of the first thyristor 21, respectively. The first driving circuit 22 is actually matched with the first thyristor 21 to form the first bypass module 2, and is used for bypassing the commutation module 1 in case of a fault when the commutation module 1 outputs a forward voltage. As shown in fig. 1, the first driving circuit 22 includes a first diode 221, a first relay 222,
the positive end of the first diode 221 is connected to the anode end of the first thyristor 21, and the negative end thereof is connected to the gate end of the first thyristor 21; here, the first diode 221 is a breakdown diode (BOD1), the first diode 221 is turned on in the forward direction and turned off in the reverse direction, and when it is determined whether the forward voltage output from the commutation module 1 is greater than or equal to the threshold voltage of the first diode 221, the first diode 221 is turned on in the forward direction. The provision of the first diode 221 may assist the first driver circuit 22 in bypassing the failed commutation module 1 during the positive half cycle of the alternating current. The first relay 222 has one end connected to the positive terminal of the first diode 221 and the other end connected to the negative terminal of the first diode 221. When the commutation module 1 has a fault, the first thyristor 21 is triggered to be turned on after the first diode 221 is turned on, the controller sends an instruction to turn on the first relay 222, and the first relay 222 is turned off when the commutation module 1 works normally, in fig. 1, the first relay 222 is K1, the first relay 222 is used as a switching device in the first driving circuit 22 to perform a switching operation, and the first relay 222 is connected with the controller 4.
In fig. 1, the first driving circuit 22 in this embodiment further includes a first filter circuit 23, which includes a first resistor 231 and a first capacitor 232, one end of the first resistor 231 is connected to the negative terminal of the first diode 221 and one end of the first capacitor 232, respectively, and the other end of the first resistor 231 is connected to the other end of the first capacitor 232 and the cathode terminal of the first thyristor 21, respectively. The first filter circuit 23 is configured to absorb a high-frequency interference signal through the first resistor 231 and the first capacitor 232 included therein, so as to prevent the first thyristor 21 from being turned on erroneously due to interference of the interference signal.
The first driving circuit 22 is actually matched with the first thyristor 21 to form the first bypass module 2, and the first bypass module 2 is configured to bypass the commutation module 1 when the commutation module 1 outputs a forward voltage and the commutation module 1 fails.
As shown in fig. 1, the second driving circuit 32 includes a second diode 321 and a second relay 322, wherein a positive terminal of the second diode 321 is connected to an anode terminal of the second thyristor 31, and a negative terminal thereof is connected to a gate terminal of the second thyristor 31; the second diode 321 is a breakdown diode (BOD2), and when it is determined whether the reverse voltage output by the commutation module 1 is greater than or equal to the threshold voltage of the second diode 321, the second diode 321 is turned on. Therefore, the provision of the second diode 321 may assist the second driver circuit 32 in bypassing the failed commutation module 1 during the negative half cycle of the alternating current. The second relay 322 has one end connected to the positive terminal of the second diode 321 and the other end connected to the negative terminal of the second diode 321. When the commutation module 1 has a fault, the second thyristor 31 is triggered to be turned on after the second diode 321 is turned on, the controller sends an instruction to turn on the second relay 322, and the second relay 322 is turned off when the commutation module 1 works normally, in fig. 1, the second relay 322 is K2, the second relay 322 is used as a switching device in the second driving circuit 32 to perform a switching operation, and the second relay 322 is connected with the controller.
In fig. 1, the second driving circuit 32 in this embodiment further includes a second filter circuit 33, which includes a second resistor 331 and a second capacitor 332, one end of the second resistor 331 is connected to the negative terminal of the second diode 321 and one end of the second capacitor 332, and the other end of the second resistor 331 is connected to the other end of the second capacitor 332 and the cathode terminal of the second thyristor 31.
The second driving circuit 32 is actually matched with the second thyristor 31 to form the second bypass module 3, and the second bypass module 3 is used for bypassing the commutation module 1 when the commutation module 1 outputs a reverse voltage and the commutation module 1 fails.
In fig. 1, the first thyristor 21 is Thy1, the first diode 221 is BOD1, the first relay 222 is K1, the first resistor 231 is R11, the first capacitor 232 is C11, the second thyristor 31 is Thy2, the second diode 321 is BOD2, the second relay 322 is K2, the second resistor 331 is R21, and the second capacitor 332 is C21.
The controller 4 in the bypass circuit in the embodiment of the present invention is connected to the first driving circuit 22 and the second driving circuit 32, respectively. The controller 4 here belongs to a conventional controller 4 in the prior art. When the converter module 1 outputs a forward voltage, and the forward voltage is greater than or equal to a forward preset voltage of the first driving circuit 22, that is, the forward preset voltage is a threshold voltage for turning on the first diode 221, a trigger signal is applied to the gate of the first thyristor 21, so that the first thyristor 21 is triggered to be turned on, and meanwhile, the controller 4 controls the first relay 222 in the first driving circuit 22 to act, so as to bypass the converter module 1 with a fault; when the commutation module 1 outputs a reverse voltage, and the reverse voltage is greater than or equal to a reverse preset voltage of the second driving circuit 32, that is, the reverse preset voltage is a threshold voltage for turning on the second diode 321, a gate trigger signal is applied to the second thyristor 31, so that the second thyristor 31 is triggered to be turned on, and the controller 4 controls the second relay 322 in the second driving circuit 32 to act, so as to bypass the failed commutation module 1; after the commutation module 1 outputs the forward voltage and bypasses the failed commutation module 1, the second relay 322 in the second driving circuit 32 is controlled to be in the conducting state in advance, so that the failed commutation module 1 can be quickly bypassed when the commutation module 1 outputs the reverse voltage, and similarly, after the commutation module 1 outputs the reverse voltage and bypasses the failed commutation module 1, the first relay 222 in the first driving circuit 22 is controlled to be in the conducting state in advance, so that the failed commutation module 1 can be quickly bypassed when the commutation module 1 outputs the forward voltage.
As shown in fig. 2 or 3, the commutation module 1 outputs a forward voltage or a reverse voltage, and in fig. 1, the forward preset voltage is U1+, and in fig. 3, the reverse preset voltage is U1-. The first bypass module 2 and the second bypass module 3 operate alternately, that is, in both positive and negative half cycles of the alternating current, the failed commutation module 1 can be bypassed, and during the positive half cycle, since the second relay 322 in the second driving circuit 32 can be turned on in advance after the first driving circuit 22 performs the operation in preparation for the second bypass module 3 to rapidly enter the operating state when the negative half cycle voltage arrives, or during the negative half cycle, since the second relay 322 in the second driving circuit 32 can be turned on in advance after the second driving circuit 32 performs the operation in preparation for the first bypass module 2 to rapidly enter the operating state when the positive half cycle voltage arrives, the bypass speed can be significantly increased, and good mechanical characteristics are provided.
The bypass circuit in the embodiment of the invention can also effectively reduce the occupied space, thereby obviously reducing the design cost of the power device.
Example 2
The embodiment of the invention provides a control method of a bypass circuit, which is used for the bypass circuit in the embodiment 1. The control method of the bypass circuit, as shown in fig. 3, includes the following steps:
s31, when the output voltage of the commutation module 1 is a forward voltage, if the forward voltage is greater than or equal to the threshold voltage of the first diode 221 (the breakdown diode BOD1) in the first driving circuit 22, controlling the first driving circuit 22 to operate so that the commutation module 1 is bypassed, and controlling the second relay 322 in the second driving circuit 32 to be in a conducting state in advance and the first relay 222 in the first driving circuit 22 to be in a conducting state in advance, respectively. The forward voltage here is the voltage output by the commutation module 1 during the positive half cycle of the alternating current.
The threshold voltage here is the rated threshold voltage of the first diode 221 (breakdown diode BOD1), and if the output voltage of the commutation module 1 is the forward voltage, it indicates that the commutation module 1 outputs a voltage signal in the positive half cycle of the alternating current. The forward preset voltage is a rated threshold voltage capable of enabling the first diode 221 (breakdown diode BOD1) in the first driving circuit 22 to be turned on, and the failed commutation module 1 is bypassed by applying a gate trigger signal to the first thyristor 21 to trigger the conduction.
Here, the second relay 322 is in a conducting state in advance, which means that when the commutation module 1 outputs a forward voltage, and the forward voltage is greater than or equal to a forward preset voltage, the first driving circuit 22 performs operation, the gate of the first thyristor 21 is triggered to conduct, the commutation module 1 with a fault is bypassed during a positive half cycle, in order to ensure that a voltage of a negative half cycle arrives, the second driving circuit 32 quickly enters the operating state, the second relay 322 in the second driving circuit 32 is logically conducted in advance, and since the voltage of the negative half cycle does not arrive, even if the second relay 322 is in the conducting state in advance, the second thyristor 31 cannot be triggered.
Here, the first relay 222 is in a conducting state in advance, which means that when the commutation module 1 outputs a reverse voltage, and the reverse voltage is greater than or equal to a reverse preset voltage of the second driving circuit 22, the second driving circuit 32 performs operation, the gate of the second thyristor 31 is triggered to conduct, the failed commutation module 1 is bypassed during the negative half cycle, in order to ensure that the voltage of the positive half cycle arrives, the first driving circuit 22 quickly enters the working state, the first relay 222 in the first driving circuit 22 is logically conducted in advance, and the first thyristor 21 cannot be triggered even if the first relay 222 is in the conducting state in advance because the voltage of the positive half cycle does not arrive. The sequence of the steps S32 and S33 does not affect the execution result.
S32, when the output voltage of the commutation module 1 is a reverse voltage, if the reverse voltage is greater than or equal to the threshold voltage of the second diode 321 (the breakdown diode BOD2) of the second driving circuit 32, controlling the second driving circuit 32 to operate so that the commutation module 1 is bypassed, and controlling the first relay 222 in the first driving circuit 22 to be in a conducting state in advance and the second relay 322 in the second driving circuit 32 to be in a conducting state in advance, respectively. The positive reverse voltage is the voltage output by the commutation module 1 during the negative half cycle of the alternating current. Therefore, the commutation module 1 outputs voltage signals in both positive and negative half cycles of the alternating current.
The threshold voltage here is the rated threshold voltage of the second diode 321 (breakdown diode BOD2), and if the output voltage of the commutation module 1 is the reverse voltage, it indicates that the commutation module 1 outputs a voltage signal in the negative half cycle of the alternating current. The reverse preset voltage is a rated threshold voltage capable of turning on the second diode 321 in the second driving circuit 32, and the second thyristor 31 is triggered to be turned on by applying a gate trigger signal to the second thyristor, so as to bypass the failed commutation module 1.
The above steps S31 and S32 can achieve that the first driving circuit 22 and the second driving circuit 32 can be alternately turned on in both positive and negative half cycles of the alternating current, and in each voltage cycle, the commutation module 1 with the fault can be guaranteed to be bypassed all the time, so the bypass circuit in this embodiment has good mechanical characteristics, and further improves the reliability of the operation of the power system.
The control method of the bypass circuit in the embodiment of the invention further comprises the following steps: when the output voltage of the commutation module 1 is a forward voltage, if the forward voltage is smaller than a forward preset voltage, the first driving circuit 22 is in a disconnected state. When the output voltage of the commutation module 1 is a forward voltage, at this time, if the forward voltage is smaller than a forward preset voltage, it indicates that the commutation module 1 is in a normal working state, a bypass of the commutation module is not needed, and the first driving circuit 22 is in a disconnected state, so that the first thyristor 21 cannot be triggered to be switched on.
The control method of the bypass circuit in the embodiment of the invention further comprises the following steps: when the output voltage of the commutation module 1 is a reverse voltage, if the forward voltage is smaller than a reverse preset voltage, the second driving circuit 32 is in a disconnected state. When the output voltage of the commutation module 1 is a reverse voltage, at this time, if the reverse voltage is smaller than a reverse preset voltage, it indicates that the commutation module 1 is in a normal working state, and it is not necessary to bypass the commutation module, and the second driving circuit 32 is in a disconnected state, so that the second thyristor 31 cannot be triggered to be turned on.
The control method of the bypass circuit in the embodiment of the invention can realize the situation that when the converter module 1 fails, and at any time when the converter module 1 outputs voltage, the converter module 1 which will fail can be ensured to bypass rapidly.
The method for controlling the bypass circuit in the embodiment of the invention may further include: when the commutation module works normally, the first filter circuit 23 and/or the second filter circuit 33 are respectively controlled to filter the high-frequency signal generated in the bypass circuit. Here, by controlling the first filter circuit 23 and/or the second filter circuit 33, it is possible to absorb a high frequency signal and prevent the first thyristor 21 or the second thyristor 31 from being turned on by an interference signal.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (9)
1. A bypass circuit, comprising:
the anode end of the first thyristor is connected with the first output end of the commutation module, and the cathode end of the first thyristor is connected with the second output end of the commutation module;
the anode end of the second thyristor is connected with the second output end of the commutation module, and the cathode end of the second thyristor is connected with the first output end of the commutation module;
a first driving circuit connected to an anode terminal and a gate terminal of the first thyristor, respectively;
the second driving circuit is respectively connected with the anode end and the gate electrode end of the second thyristor;
the controller is respectively connected with the first driving circuit and the second driving circuit, and is used for controlling the first driving circuit to execute work so that the commutation module is bypassed and respectively controlling a second relay in the second driving circuit to be in a conducting state in advance and a first relay in the first driving circuit to be in a conducting state in advance when the output voltage of the commutation module is a forward voltage and if the forward voltage is greater than or equal to a forward preset voltage of the first driving circuit;
when the output voltage of the commutation module is a reverse voltage, if the reverse voltage is greater than or equal to a reverse preset voltage of the second drive circuit, controlling the second drive circuit to execute work so that the commutation module is bypassed, and controlling a first relay in the first drive circuit to be in a conducting state in advance and a second relay in the second drive circuit to be in a conducting state in advance.
2. The bypass circuit of claim 1, wherein the first drive circuit further comprises: a first diode and a first relay;
the positive pole end of the first diode is connected with the anode end of the first thyristor, the negative pole end of the first diode is connected with the gate pole end of the first thyristor, one end of the first relay is connected with the positive pole end of the first diode, and the other end of the first relay is connected with the negative pole end of the first diode.
3. The bypass circuit according to claim 2, wherein the second driving circuit comprises: a second diode and a second relay; the positive terminal of the second diode is connected with the positive terminal of the second thyristor, the negative terminal of the second diode is connected with the gate terminal of the second thyristor, one end of the second relay is connected with the positive terminal of the second diode, and the other end of the second relay is connected with the negative terminal of the second diode.
4. The bypass circuit according to claim 3, wherein the forward preset voltage of the first driving circuit is a threshold voltage of the first diode, and the reverse preset voltage of the second driving circuit is a threshold voltage of the second diode.
5. The bypass circuit of claim 2, further comprising:
and the first filter circuit comprises a first resistor and a first capacitor, one end of the first resistor is respectively connected with the negative electrode end of the first diode and one end of the first capacitor, and the other end of the first resistor is respectively connected with the other end of the first capacitor and the cathode end of the first thyristor.
6. The bypass circuit of claim 3, further comprising:
and the second filter circuit comprises a second resistor and a second capacitor, one end of the second resistor is respectively connected with the cathode end of the second diode and one end of the second capacitor, and the other end of the second resistor is respectively connected with the other end of the second capacitor and the cathode end of the second thyristor.
7. The bypass circuit according to claim 6, wherein the first relay and the second relay are respectively connected to the controller.
8. A control method for the bypass circuit according to any one of claims 1 to 7, comprising the steps of:
when the output voltage of the commutation module is a forward voltage, if the forward voltage is greater than or equal to a forward preset voltage of the first drive circuit, controlling the first drive circuit to execute work so that the commutation module is bypassed, and respectively controlling the second relay in the second drive circuit to be in a conducting state in advance and the first relay in the first drive circuit to be in a conducting state in advance;
when the output voltage of the commutation module is a reverse voltage, if the reverse voltage is greater than or equal to a reverse preset voltage of the second drive circuit, controlling the second drive circuit to execute work so that the commutation module is bypassed, and controlling the first relay in the first drive circuit to be in a conducting state in advance and the second relay in the second drive circuit to be in a conducting state in advance.
9. The method as claimed in claim 8, wherein the first driving circuit includes a first diode and a first relay, the second driving circuit includes a second diode and a second relay, the forward preset voltage of the first driving circuit is the threshold voltage of the first diode, and the reverse preset voltage of the second driving circuit is the threshold voltage of the second diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811086057.2A CN109245503B (en) | 2018-09-18 | 2018-09-18 | Bypass circuit and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811086057.2A CN109245503B (en) | 2018-09-18 | 2018-09-18 | Bypass circuit and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109245503A CN109245503A (en) | 2019-01-18 |
| CN109245503B true CN109245503B (en) | 2020-09-08 |
Family
ID=65059663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811086057.2A Active CN109245503B (en) | 2018-09-18 | 2018-09-18 | Bypass circuit and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109245503B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100424959C (en) * | 2006-03-17 | 2008-10-08 | 中国电力科学研究院 | Breakdown diode triggering thyristor valve over-voltage protector |
| CN102522882B (en) * | 2011-11-28 | 2015-07-08 | 中国电力科学研究院 | Protection circuit of converter power component |
| CN202616988U (en) * | 2012-05-03 | 2012-12-19 | Abb研究有限公司 | Half-bridge power converter unit with bypass function |
| WO2018001515A1 (en) * | 2016-07-01 | 2018-01-04 | Abb Schweiz Ag | Detection of high current time derivatives in a cell of a modular multilevel converter |
| CN206517292U (en) * | 2016-12-29 | 2017-09-22 | 国网浙江省电力公司绍兴供电公司 | A kind of current-limiting type UPFC DC side overvoltage protection circuits |
| CN107394767B (en) * | 2017-08-08 | 2020-01-03 | 全球能源互联网研究院有限公司 | Bypass quick protection circuit for direct current circuit breaker |
-
2018
- 2018-09-18 CN CN201811086057.2A patent/CN109245503B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109245503A (en) | 2019-01-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2858195B1 (en) | Converter circuit | |
| JP5230777B2 (en) | Power converter | |
| US20190068076A1 (en) | Power Conversion Device | |
| JP5195220B2 (en) | Driving circuit for power conversion circuit | |
| JP2015162999A (en) | Power conversion apparatus and control method of power conversion apparatus | |
| CN106849635A (en) | Cascade connection multi-level transverter submodule pressure bypass circuit out of control | |
| US20190074149A1 (en) | DC Voltage Switch | |
| EP3522196B1 (en) | Switching apparatus | |
| CN111835221A (en) | DC/AC power conversion device | |
| US10236682B2 (en) | Inrush current free switching apparatus and control method thereof | |
| CN209844635U (en) | Intelligent redundant power supply conversion device | |
| CN110022055B (en) | Operation control method, device, circuit, household appliance and computer storage medium | |
| CN114301271B (en) | Power conversion system and control method | |
| JP2013074767A (en) | Dc/dc converter | |
| CN111049366B (en) | Bus capacitor discharge circuit after power failure of servo driver, control method and servo driver | |
| JP2019170148A (en) | Initial charging system for high-voltage inverter and control method therefor | |
| CN109245503B (en) | Bypass circuit and control method thereof | |
| JP2014045566A (en) | Ac-ac bidirectional power converter | |
| CN101567553B (en) | Circuit for protecting a DC network against overvoltage | |
| CN111200308A (en) | Charging circuit and device integrated in double-motor control system | |
| CN112952983B (en) | Power supply switching circuit and control method thereof | |
| CN113794470A (en) | Silicon controlled rectifier driving circuit, silicon controlled rectifier driving application circuit and electric/electrical equipment | |
| CN111509681A (en) | Solid-state direct-current circuit breaker sharing energy consumption branch and application method thereof | |
| JP2016126920A (en) | High voltage current circuit breaker | |
| CN217994165U (en) | High-voltage system of vehicle and vehicle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |