CN210864457U - Voltage clamping module and common-mode voltage clamping circuit on machine side of wind power converter - Google Patents
Voltage clamping module and common-mode voltage clamping circuit on machine side of wind power converter Download PDFInfo
- Publication number
- CN210864457U CN210864457U CN201922192666.2U CN201922192666U CN210864457U CN 210864457 U CN210864457 U CN 210864457U CN 201922192666 U CN201922192666 U CN 201922192666U CN 210864457 U CN210864457 U CN 210864457U
- Authority
- CN
- China
- Prior art keywords
- electrically connected
- voltage
- module
- diode
- resistor
- 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
Images
Landscapes
- Rectifiers (AREA)
Abstract
The application provides a voltage clamping module and a common-mode voltage clamping circuit of a wind power converter side. The voltage clamping module comprises a first TVS tube, a second TVS tube, a first resistor and a second resistor; the positive electrode of the first TVS tube is electrically connected with the first end of the first resistor, and the negative electrode of the first TVS tube is electrically connected with the direct-current positive voltage end; the negative electrode of the second TVS tube, the second end of the first resistor and the first end of the second resistor are electrically connected to the first node; and the anode of the second TVS tube and the second end of the second resistor are electrically connected with the direct-current negative voltage end. The first TVS tube and the first resistor form a voltage stabilizing circuit, and the value of the direct current common mode voltage can be kept in an expected range; the second TVS tube and the second resistor form a protection circuit, so that the safety of the power unit can be protected, and the on-off state of the power unit can be controlled.
Description
Technical Field
The application relates to the technical field of voltage conversion, in particular to a voltage clamping module and a common-mode voltage clamping circuit of a wind power converter side.
Background
In order to limit the machine side common mode voltage of the wind power converter, an RLC common mode filter circuit is mainly adopted for filtering so as to reduce the amplitude of the common mode voltage. The scheme is sensitive to the generator side parameters, the generator parameters and the cable length of a converter of the wind turbine generator, different sets need different RLC parameters, and high-frequency common-mode voltage spikes cannot be completely inhibited.
In addition, some existing circuit structures for clamping circuit voltage generally include electrically connected diodes, resistors, switching devices, and the like, and the circuit structures can control the switching devices to be turned on when the circuit voltage exceeds a preset value, so as to change the flow direction of current in the circuit to reduce the circuit voltage, thereby achieving the purpose of clamping high-frequency common mode voltage.
However, the above circuit structure lacks effective control over the switching device in the non-operating state, and cannot completely ensure that the switching device is in the off state.
SUMMERY OF THE UTILITY MODEL
The application aims at the defects of the existing mode and provides a voltage clamping module and a common-mode voltage clamping circuit of a wind power converter side, and the common-mode voltage clamping circuit is used for solving the technical problem that the existing circuit structure for voltage clamping lacks effective control over a switching device in a non-working state.
In a first aspect, an embodiment of the present application provides a voltage clamping module, which includes a first TVS transistor, a second TVS transistor, a first resistor, and a second resistor;
the positive electrode of the first TVS tube is electrically connected with the first end of the first resistor, and the negative electrode of the first TVS tube is electrically connected with the direct-current positive voltage end;
the negative electrode of the second TVS tube, the second end of the first resistor and the first end of the second resistor are electrically connected to the first node; and the anode of the second TVS tube and the second end of the second resistor are electrically connected with the direct-current negative voltage end.
In a second aspect, an embodiment of the present application provides a common-mode voltage clamping circuit on a machine side of a wind power converter, including a rectification module, an energy bleeding module, and a voltage clamping module provided in the embodiment of the present application;
the negative electrode of a first TVS tube in the voltage clamping module is electrically connected with a direct-current positive voltage end, and the positive electrode of a second TVS tube in the voltage clamping module and the second end of a second resistor are electrically connected with a direct-current negative voltage end;
the energy discharge module comprises a power unit and a third resistor; the control end of the power unit is electrically connected with the first node of the voltage clamping module, the input end of the power unit is electrically connected with the first end of the third resistor, and the output end of the power unit is electrically connected with the direct-current negative voltage end; the avalanche voltage of the second TVS tube is less than the maximum allowable voltage of the control end of the power unit;
two direct current output ends of the rectification module are respectively and electrically connected with a direct current positive voltage end and a direct current negative voltage end; and the alternating current input end of the rectifying module is used for receiving alternating current output by the converter.
The technical scheme provided by the embodiment of the application at least has the following beneficial effects:
the voltage clamping module that this application embodiment provided can use in common mode voltage clamping circuit, and voltage clamping module's first TVS pipe and first resistance constitute voltage stabilizing circuit, and when the avalanche voltage of DC common mode voltage excess first TVS pipe, first TVS pipe is broken down and switches on, and DC common mode voltage loads to power unit's control end through first resistance for power unit switches on, and the energy module of bleeding begins to consume common mode energy in order to reduce DC common mode voltage. When the direct current common mode voltage is reduced to be lower than the avalanche voltage of the first TVS tube, the first TVS tube is turned off, the power unit is turned off, the energy release module stops consuming common mode energy, and the process of reducing the direct current common mode voltage is finished.
The second TVS transistor and the second resistor of the voltage clamping module constitute a protection circuit, and an avalanche voltage of the second TVS transistor should be less than a maximum allowable voltage of the control terminal of the power unit. When the first TVS tube is broken down and conducted, if the DC common mode voltage is higher than the maximum allowable voltage of the control end of the power unit, the second TVS tube is broken down and conducted, so that the DC common mode voltage is prevented from being loaded to the control end of the power unit, and the power unit is prevented from being damaged. In addition, because the control end and the output end of the power unit are respectively and electrically connected with the two ends of the second resistor, when the power unit is in the turn-off state of the first TVS tube, the second resistor can ensure that the voltages of the control end and the output end of the power unit are equal, thereby ensuring that the power unit is in the turn-off state.
In summary, the voltage clamping module provided in the embodiment of the present application can maintain the value of the dc common mode voltage of the common mode voltage clamping circuit within a desired range, and can protect the safety of the power unit of the common mode voltage clamping circuit and control the on/off state of the power unit.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a voltage clamping module according to an embodiment of the present disclosure;
fig. 2 is an equivalent structural diagram of a first TVS tube and a second TVS tube provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of a common-mode voltage clamping circuit on a machine side of a wind power converter provided by an embodiment of the present application;
fig. 4 is a schematic work flow diagram of a common-mode voltage clamping circuit on a machine side of a wind power converter provided in an embodiment of the present application;
fig. 5 is an equivalent structure diagram of a power unit provided in the embodiment of the present application;
fig. 6 is an equivalent structure diagram of a second diode provided in the embodiment of the present application;
fig. 7 is an equivalent structure diagram of a first rectifying diode, a second rectifying diode, a third rectifying diode and a fourth rectifying diode provided in the embodiment of the present application.
Detailed Description
Reference will now be made in detail to the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts or parts having the same or similar functions throughout. In addition, if a detailed description of the known art is not necessary for illustrating the features of the present application, it is omitted. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
The terms referred to in this application will first be introduced and explained:
the Full-power Converter (English name Full-power Converter) consists of a motor side Converter, a power grid side Converter and a direct current link, and is an alternating current-direct current conversion system for bearing all energy conversion of a matched generator set.
The motor side Converter (English name Generator-side Converter) is a conversion unit which converts alternating current with voltage, current amplitude and frequency change generated by the wind driven Generator into direct current and simultaneously realizes active and reactive decoupling.
Common Mode Voltage (Common Mode Voltage), the Voltage between each conductor and ground or the chassis.
A TVS transistor, i.e., a Transient Voltage Super (TVS) is a high-performance protection device in the form of a diode.
The embodiment of the application provides a voltage clamping module 1, as shown in fig. 1, the voltage clamping module 1 includes a first TVS transistor Z1, a second TVS transistor Z2, a first resistor R1 and a second resistor R2. The positive electrode of the first TVS tube Z1 is electrically connected to the first end of the first resistor R1, and the negative electrode of the first TVS tube Z1 is electrically connected to the positive dc voltage terminal. The cathode of the second TVS tube Z2, the second end of the first resistor R1 and the first end of the second resistor R2 are electrically connected to the first node N; the anode of the second TVS tube Z2 and the second end of the second resistor R2 are electrically connected to the dc negative voltage terminal.
It should be noted that, the equivalent structure of the first TVS tube Z1 and the second TVS tube Z2 is shown in fig. 2, where the end a1 is the positive electrode of the TVS tube, and the end K1 is the negative electrode of the TVS tube. The voltage clamping module 1 can be applied to a common mode voltage clamping circuit, and can clamp the dc common mode voltage, so that the value of the dc common mode voltage is kept within a desired range.
The voltage clamping module 1 can be applied to a common mode voltage clamping circuit, and in the common mode voltage clamping circuit shown in fig. 3, after the alternating current common mode voltage is converted into the direct current common mode voltage by the rectifying module 2, the direct current common mode voltage is output through a direct current positive voltage end and a direct current negative voltage end. The negative electrode of the first TVS tube Z1 in the voltage clamping module 1 is electrically connected to the dc positive voltage terminal, and the positive electrode of the second TVS tube Z2 in the voltage clamping module 1 and the second end of the second resistor R2 are electrically connected to the dc negative voltage terminal. The control end of the power unit 31 in the energy discharge module 3 is electrically connected to the first node N of the voltage clamp module 1, and the output end of the power unit 31 is electrically connected to the dc negative voltage end (which is equivalent to the control end and the output end of the power unit 31, and are respectively electrically connected to two ends of the second resistor R2).
The first TVS tube Z1 and the first resistor R1 of the voltage clamp module 1 form a voltage stabilizing circuit, when the dc common mode voltage exceeds the avalanche voltage of the first TVS tube Z1, the first TVS tube Z1 is broken down and conducted, the dc common mode voltage is loaded to the control terminal of the power unit 31 through the first resistor R1, so that the power unit 31 is conducted, and the energy discharge module 3 starts to consume the common mode energy to reduce the dc common mode voltage. When the dc common-mode voltage decreases to be lower than the avalanche voltage of the first TVS tube Z1, the first TVS tube Z1 is turned off, the power unit 31 is also turned off, the energy discharging module 3 stops consuming the common-mode energy, and the process of dc common-mode voltage reduction ends. The above procedure achieves the object of keeping the value of the dc common mode voltage within a desired range.
The second TVS transistor Z2 and the second resistor R2 of the voltage clamp module 1 constitute a protection circuit, and the avalanche voltage of the second TVS transistor Z2 should be less than the maximum allowable voltage of the control terminal of the power unit 31. When the first TVS transistor Z1 is turned on, if the dc common mode voltage is higher than the maximum allowable voltage of the control terminal of the power unit 31, the second TVS transistor Z2 is turned on, so as to prevent the dc common mode voltage from being applied to the control terminal of the power unit 31, and prevent the power unit 31 from being damaged. In addition, since the control terminal and the output terminal of the power unit 31 are electrically connected to two terminals of the second resistor R2, respectively, when the first TVS tube Z1 is in the off state, the second resistor R2 can ensure that the voltages at the control terminal and the output terminal of the power unit 31 are equal, thereby ensuring that the power unit 31 is in the off state. The above-described procedure achieves the purpose of protecting the safety of the power unit 31 and controlling the on-off state of the power unit 31.
Based on the same inventive concept, the embodiment of the present application further provides a common-mode voltage clamping circuit on the machine side of the wind power converter, as shown in fig. 3, the common-mode voltage clamping circuit includes a rectification module 2, an energy release module 3, and a voltage clamping module 1 provided by the above embodiment of the present application.
The negative electrode of a first TVS tube Z1 in the voltage clamping module 1 is electrically connected with a direct-current positive voltage end, and the positive electrode of a second TVS tube Z2 in the voltage clamping module 1 and the second end of a second resistor R2 are electrically connected with a direct-current negative voltage end;
the energy dump module 3 comprises a power unit 31 and a third resistor R3. The control end of the power unit 31 is electrically connected to the first node N of the voltage clamping module 1, the input end of the power unit 31 is electrically connected to the first end of the third resistor R3, and the output end of the power unit 31 is electrically connected to the dc negative voltage end. The avalanche voltage of the second TVS tube Z2 is smaller than the maximum allowable voltage of the control terminal of the power unit 31;
two direct current output ends of the rectifier module 2 are respectively electrically connected with a direct current positive voltage end and a direct current negative voltage end, and an alternating current input end of the rectifier module 2 is used for receiving alternating current output by the converter.
After the converter is started, the alternating current common mode voltage is output to the alternating current input end of the rectifying module 2, and after the alternating current common mode voltage is converted into the direct current common mode voltage by the rectifying module 2, the direct current common mode voltage is output through the direct current positive voltage end and the direct current negative voltage end.
It should be noted that the dc positive voltage terminal may be a common voltage connection point, or may be a dc bus; the direct current negative voltage end can be a common voltage connection point or a direct current bus. In the embodiment of the present application, as shown in fig. 3, the positive dc voltage end is a positive dc bus a, and the negative dc voltage end is a negative dc bus B.
Fig. 4 shows a workflow of a common-mode voltage clamping circuit on the machine side of a wind power converter. As shown in fig. 4, the first TVS transistor Z1 and the first resistor R1 of the voltage clamp module 1 form a voltage stabilizing circuit. When the dc common mode voltage exceeds the avalanche voltage of the first TVS tube Z1, the first TVS tube Z1 is broken down and conducted, and the dc common mode voltage is applied to the control terminal of the power unit 31 through the first resistor R1, so that the power unit 31 is conducted. After the power unit 31 is turned on, the circuits where the dc positive voltage terminal, the third resistor R3, the power unit 31 and the dc negative voltage terminal are located are turned on, and the third resistor R3 starts to consume the common mode energy to reduce the dc common mode voltage. When the dc common-mode voltage decreases to be lower than the avalanche voltage of the first TVS tube Z1, the first TVS tube Z1 is turned off, the power unit 31 is also turned off, the circuit where the dc positive voltage terminal, the third resistor R3, the power unit 31 and the dc negative voltage terminal are located is turned off, the third resistor R3 stops consuming the common-mode energy, and the process of decreasing the dc common-mode voltage ends. The above procedure achieves the object of keeping the value of the dc common mode voltage within a desired range.
The second TVS transistor Z2 and the second resistor R2 of the voltage clamp module 1 constitute a protection circuit. Since the avalanche voltage of the second TVS tube Z2 is smaller than the maximum allowable voltage of the control terminal of the power unit 31, when the first TVS tube Z1 is breakdown-conducted, if the dc common-mode voltage is higher than the maximum allowable voltage of the control terminal of the power unit 31, the second TVS tube Z2 is breakdown-conducted, so as to prevent the dc common-mode voltage from being applied to the control terminal of the power unit 31, and prevent the power unit 31 from being damaged. In addition, since the control terminal and the output terminal of the power unit 31 are electrically connected to two terminals of the second resistor R2, respectively, when the first TVS tube Z1 is in the off state, the second resistor R2 can ensure that the voltages at the control terminal and the output terminal of the power unit 31 are equal, thereby ensuring that the power unit 31 is in the off state. The above-described procedure achieves the purpose of protecting the safety of the power unit 31 and controlling the on-off state of the power unit 31.
In addition, the common-mode voltage clamping circuit on the machine side of the wind power converter provided by the embodiment of the application can rectify, filter and clamp common-mode voltage, is suitable for full-power converters of different machine types, is insensitive to unit parameters, and has a good clamping effect on the common-mode voltage. Moreover, the common-mode voltage clamping circuit is small in size and light in weight, can be independently applied to a new wind generating set, and reduces the design cost of the set. For the operated wind generating set, if the common-mode voltage exceeds the voltage clamping capability of the traditional RLC common-mode filter in the set, the common-mode voltage clamping circuit can be applied to the operated wind generating set and clamps the common-mode voltage together with the RLC common-mode filter.
In one embodiment of the present application, as shown in fig. 5, the power unit 31 includes a fully controlled device T and a first diode D0.
The gate T0 of the fully controlled device T is used as the control terminal of the power unit 31, i.e. the gate T0 of the fully controlled device T is electrically connected to the first node N of the voltage clamp module 1.
The input electrode T1 of the full-control device T is electrically connected with the cathode D2 of the first diode D0, and serves as the input end of the power unit 31; that is, the input terminal T1 of the full-control device T is electrically connected to the cathode D2 of the first diode D0, and then electrically connected to the first terminal of the third resistor R3.
The output electrode T2 of the full-control device T is electrically connected with the positive electrode D1 of the first diode D0, and is used as the output end of the power unit 31; namely, the output electrode T2 of the full-control device T and the anode D1 of the first diode D0 are both electrically connected to the dc negative voltage end.
In one embodiment of the present application, the fully controlled device T is an insulated gate bipolar transistor, as shown in fig. 5. The gate, source and drain of the insulated gate bipolar transistor are respectively a control electrode T0, an input electrode T1 and an output electrode T2 of the fully-controlled device T.
In one embodiment of the present application, the fully-controlled device T may also be a gate turn-off thyristor. The gate, the anode and the cathode of the gate turn-off thyristor are respectively a control electrode T0, an input electrode T1 and an output electrode T2 of the fully-controlled device T.
In one embodiment of the present application, the fully-controlled device T may also be an integrated gate commutated thyristor. The gate, the anode and the cathode of the integrated gate commutated thyristor are respectively a control electrode T0, an input electrode T1 and an output electrode T2 of the fully-controlled device T.
In one embodiment of the present application, the fully controlled device T may also be a power field effect transistor. The gate, source and drain of the electric field effect transistor are respectively a control electrode T0, an input electrode T1 and an output electrode T2 of the fully-controlled device T.
In one embodiment of the present application, the energy dump module 3 further comprises a second diode D5. The anode of the second diode D5 is electrically connected to the input terminal of the power unit 31, and the cathode of the second diode D5 is electrically connected to the dc positive voltage terminal.
It should be noted that, the equivalent structure of the second diode D5 is shown in fig. 6, where the terminal a2 is the anode of the diode, and the terminal K2 is the cathode of the diode.
When the dc common-mode voltage decreases to be lower than the avalanche voltage of the first TVS tube Z1, the first TVS tube Z1 turns off, the power unit 31 turns off accordingly, the circuit where the dc positive voltage terminal, the third resistor R3, the power unit 31, and the dc negative voltage terminal are located is turned off, and when the process of decreasing the dc common-mode voltage is finished and the third resistor R3 stops consuming the common-mode energy, the second diode D5 can absorb the energy generated by the parasitic inductance of the third resistor R3.
Alternatively, the third resistor R3 may be an aluminum case resistor.
In one embodiment of the present application, the second diode D5 is a fast recovery diode. The fast recovery diode has the characteristics of good switching characteristic, short reverse recovery time and the like, and can complete the absorption of energy in a short time.
In one embodiment of the present application, the rectification module 2 includes a first rectification diode D1, a second rectification diode D2, a third rectification diode D3, and a fourth rectification diode D4.
The cathode of the first rectifying diode D1 and the cathode of the third rectifying diode D3 are used as the dc output end of the rectifying module 2, and are electrically connected to the dc positive voltage end.
The anode of the second rectifying diode D2 and the anode of the fourth rectifying diode D4 are used as another dc output end of the rectifying module 2, and are electrically connected to a dc negative voltage end.
The anode of the first rectifier diode D1 is electrically connected with the cathode of the second rectifier diode D2, and is used as an ac input end of the rectifier module 2; the anode of the third rectifier diode D3 is electrically connected to the cathode of the fourth rectifier diode D4, and together serves as the other ac input terminal of the rectifier module 2.
It should be noted that the anode of the first rectifying diode D1 and the cathode of the second rectifying diode D2 are electrically connected to the first output VA of the converter; the anode of the third rectifying diode D3 and the cathode of the fourth rectifying diode D4 are electrically connected to the second output end GND of the converter. The equivalent structure of the first rectifying diode D1, the second rectifying diode D2, the third rectifying diode D3 or the fourth rectifying diode D4 is shown in fig. 7, wherein the terminal A3 is a diode anode, and the terminal K3 is a diode cathode.
The rectifier module 2 may also be in other forms as long as it can convert the high-frequency common-mode voltage into the dc voltage, and the rectifier modules 2 in other forms are not described herein again.
The silicon carbide diode has the characteristics of high voltage resistance, short reverse recovery time and the like, can perform direct current conversion on alternating current common mode voltage with high frequency and large voltage change rate, and has a good absorption effect on the direct current common mode voltage. Therefore, in order to further improve the conversion effect of the rectifier module 2 on the ac common mode voltage, in an embodiment of the present application, the first rectifier diode D1, the second rectifier diode D2, the third rectifier diode D3, and the fourth rectifier diode D4 are all silicon carbide diodes.
In one embodiment of the present application, as shown in fig. 3, the common mode voltage clamping circuit further includes an energy storage module 4. Two ends of the energy storage module 4 are respectively electrically connected with the direct-current positive voltage end and the direct-current negative voltage end.
The energy storage module 4 can store energy generated by the dc common mode voltage, so that the dc common mode voltage is kept stable to a large extent.
In one embodiment of the present application, the energy storage module 4 comprises a dc support capacitor C1, as shown in fig. 3. Two ends of the direct current supporting capacitor C1 are respectively and electrically connected with the direct current positive voltage end and the direct current negative voltage end.
Optionally, the dc supporting capacitor C1 is a thin film dc supporting capacitor with high voltage endurance.
In an embodiment of the present application, the energy storage module 4 may also include a capacitor bank formed by serially connecting a plurality of dc support capacitors, and two ends of the capacitor bank are electrically connected to the dc positive voltage end and the dc negative voltage end, respectively.
Optionally, the dc supporting capacitor in the capacitor bank is a thin film dc supporting capacitor with high voltage endurance.
In the common mode voltage clamping circuit provided by the embodiment of the application, the first TVS tube and the first resistor of the voltage clamping module form a voltage stabilizing circuit, when the dc common mode voltage exceeds the avalanche voltage of the first TVS tube, the first TVS tube is broken down and conducted, the dc common mode voltage is loaded to the control end of the power unit through the first resistor, so that the power unit is conducted, and the energy discharge module starts to consume the common mode energy to reduce the dc common mode voltage. When the direct current common mode voltage is reduced to be lower than the avalanche voltage of the first TVS tube, the first TVS tube is turned off, the power unit is turned off, the energy release module stops consuming common mode energy, and the process of reducing the direct current common mode voltage is finished.
The second TVS transistor and the second resistor of the voltage clamping module constitute a protection circuit, and an avalanche voltage of the second TVS transistor should be less than a maximum allowable voltage of the control terminal of the power unit. When the first TVS tube is broken down and conducted, if the DC common mode voltage is higher than the maximum allowable voltage of the control end of the power unit, the second TVS tube is broken down and conducted, so that the DC common mode voltage is prevented from being loaded to the control end of the power unit, and the power unit is prevented from being damaged. In addition, because the control end and the output end of the power unit are respectively and electrically connected with the two ends of the second resistor, when the power unit is in the turn-off state of the first TVS tube, the second resistor can ensure that the voltages of the control end and the output end of the power unit are equal, thereby ensuring that the power unit is in the turn-off state.
In summary, the voltage clamping module provided in the embodiment of the present application can maintain the value of the dc common mode voltage of the common mode voltage clamping circuit within a desired range, and can protect the safety of the power unit of the common mode voltage clamping circuit and control the on/off state of the power unit.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (10)
1. A voltage clamping module is characterized by comprising a first TVS tube, a second TVS tube, a first resistor and a second resistor;
the positive electrode of the first TVS tube is electrically connected with the first end of the first resistor, and the negative electrode of the first TVS tube is electrically connected with the direct-current positive voltage end;
the negative electrode of the second TVS tube, the second end of the first resistor and the first end of the second resistor are electrically connected to a first node; and the anode of the second TVS tube and the second end of the second resistor are electrically connected with a direct-current negative voltage end.
2. A common-mode voltage clamping circuit on the machine side of a wind power converter is characterized by comprising a rectifying module, an energy discharging module and the voltage clamping module according to claim 1;
the negative electrode of a first TVS tube in the voltage clamping module is electrically connected with the direct-current positive voltage end, and the positive electrode of a second TVS tube in the voltage clamping module and the second end of a second resistor are electrically connected with the direct-current negative voltage end;
the energy discharge module comprises a power unit and a third resistor; the control end of the power unit is electrically connected with the first node of the voltage clamping module, the input end of the power unit is electrically connected with the first end of the third resistor, and the output end of the power unit is electrically connected with the direct-current negative voltage end; the avalanche voltage of the second TVS tube is less than the maximum allowable voltage of the control end of the power unit;
the two direct current output ends of the rectification module are respectively and electrically connected with the direct current positive voltage end and the direct current negative voltage end; and the alternating current input end of the rectification module is used for receiving alternating current output by the converter.
3. The common mode voltage clamping circuit of claim 2, wherein the power cell comprises a fully controlled device and a first diode;
the control electrode of the full-control device is used as a control end of the power unit; the input electrode of the full-control device is electrically connected with the cathode of the first diode and is used as the input end of the power unit; and the output electrode of the full-control device is electrically connected with the anode of the first diode and is used as the output end of the power unit together.
4. A common-mode voltage clamping circuit according to claim 3, wherein the fully-controlled device is one of a gate turn-off thyristor, a power field effect transistor, an insulated gate bipolar transistor and an integrated gate commutated thyristor.
5. The common mode voltage clamping circuit of claim 2, wherein the energy bleed-off module further comprises a second diode; the positive pole of the second diode is electrically connected with the input end of the power unit, and the negative pole of the second diode is electrically connected with the direct-current positive voltage end.
6. A common mode voltage clamping circuit according to claim 5 wherein the second diode is a fast recovery diode.
7. The common mode voltage clamping circuit of claim 2, wherein the rectifying module comprises a first rectifying diode, a second rectifying diode, a third rectifying diode, and a fourth rectifying diode;
the negative electrode of the first rectifier diode and the negative electrode of the third rectifier diode are used as direct current output ends of the rectifier modules and are electrically connected with the direct current positive voltage end;
the positive electrode of the second rectifier diode and the positive electrode of the fourth rectifier diode are used as the other direct current output end of the rectifier module and are electrically connected with the direct current negative voltage end;
the anode of the first rectifier diode is electrically connected with the cathode of the second rectifier diode and is used as an alternating current input end of the rectifier module; and the anode of the third rectifying diode is electrically connected with the cathode of the fourth rectifying diode and is used as the other alternating current input end of the rectifying module together.
8. The common mode voltage clamping circuit of claim 7, wherein the first, second, third and fourth rectifying diodes are silicon carbide diodes.
9. The common mode voltage clamping circuit of claim 2, further comprising an energy storage module; and the two ends of the energy storage module are respectively and electrically connected with the direct-current positive pressure end and the direct-current negative pressure end.
10. The common mode voltage clamping circuit of claim 9 wherein said energy storage block comprises a dc support capacitor; two ends of the direct current support capacitor are respectively and electrically connected with the direct current positive voltage end and the direct current negative voltage end;
or the energy storage module comprises a capacitor bank formed by connecting a plurality of direct current support capacitors in series; and two ends of the capacitor bank are respectively and electrically connected with the direct current positive voltage end and the direct current negative voltage end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922192666.2U CN210864457U (en) | 2019-12-09 | 2019-12-09 | Voltage clamping module and common-mode voltage clamping circuit on machine side of wind power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922192666.2U CN210864457U (en) | 2019-12-09 | 2019-12-09 | Voltage clamping module and common-mode voltage clamping circuit on machine side of wind power converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210864457U true CN210864457U (en) | 2020-06-26 |
Family
ID=71285455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922192666.2U Active CN210864457U (en) | 2019-12-09 | 2019-12-09 | Voltage clamping module and common-mode voltage clamping circuit on machine side of wind power converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210864457U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023272976A1 (en) * | 2021-06-29 | 2023-01-05 | 新疆金风科技股份有限公司 | High voltage ride through device and method, wind power converter, and wind turbine set |
-
2019
- 2019-12-09 CN CN201922192666.2U patent/CN210864457U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023272976A1 (en) * | 2021-06-29 | 2023-01-05 | 新疆金风科技股份有限公司 | High voltage ride through device and method, wind power converter, and wind turbine set |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20210061114A1 (en) | On-board charging and discharging system | |
| EP2933909B1 (en) | Converter and voltage clamp circuit therein | |
| WO2023246710A1 (en) | Power conversion apparatus, charging pile, on-board charger and electric vehicle | |
| CN212323990U (en) | Auxiliary power supply's start protection circuit, dc-to-ac converter and photovoltaic inversion system | |
| CN210864457U (en) | Voltage clamping module and common-mode voltage clamping circuit on machine side of wind power converter | |
| CN110429644B (en) | Inverter and power supply system | |
| CN106992675A (en) | A kind of switched inductors capacitance group and unit supercharging high voltage gain DC converter | |
| CN101982921B (en) | Universal high-voltage capacitor energy storage module | |
| WO2018177062A1 (en) | Power supply system and control method for power supply system | |
| CN2577503Y (en) | Over voltage protection device of single-phase bridge inverter for medium voltage frequency transformer | |
| CN112054583A (en) | Integrated CT induction power supply device and power supply method | |
| CN209982435U (en) | Photovoltaic system prevent PID device and photovoltaic system | |
| US20150180344A1 (en) | Control device and method for charging an electrical energy store | |
| JP2014033553A (en) | Dc-dc power conversion device and power conditioner for photovoltaic power generation system | |
| CN108736707B (en) | BOOST converter with switch inductance structure | |
| CN215528878U (en) | Switching power supply device | |
| CN116232094A (en) | Auxiliary power supply and inverter | |
| CN113904314A (en) | TVS diode anti-surge circuit for compressor controller | |
| CN207559576U (en) | Energy-storage system and energy accumulation current converter | |
| CN207251215U (en) | A kind of energy storage device and current transformer | |
| CN207638561U (en) | Increasing apparatus, power supply module and terminal | |
| CN107809131A (en) | Uninterrupted power source | |
| CN216146241U (en) | Overvoltage suppression circuit, converter and frequency converter | |
| CN110729896A (en) | Bidirectional direct current converter based on MMC and control system thereof | |
| CN212908987U (en) | Short-circuit protection circuit of three-phase inversion module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No.107 Shanghai Road, Urumqi Economic and Technological Development Zone, Urumqi City, Xinjiang Uygur Autonomous Region Patentee after: Jinfeng Technology Co.,Ltd. Address before: No.107 Shanghai Road, Urumqi Economic and Technological Development Zone, Urumqi City, Xinjiang Uygur Autonomous Region Patentee before: XINJIANG GOLDWIND SCIENCE & TECHNOLOGY Co.,Ltd. |