CN115580123A - Protection device and method for current source type current converter - Google Patents
Protection device and method for current source type current converter Download PDFInfo
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- CN115580123A CN115580123A CN202211059638.3A CN202211059638A CN115580123A CN 115580123 A CN115580123 A CN 115580123A CN 202211059638 A CN202211059638 A CN 202211059638A CN 115580123 A CN115580123 A CN 115580123A
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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Abstract
The invention provides a protection device and a method for a current source type converter, wherein the protection device comprises a protection circuit, wherein the protection circuit comprises: a damping branch and a damping branch; the damping branch is used for transferring the main branch current of the current source type converter at the turn-off moment of the full-control device; and the suppression branch is used for suppressing the voltage at two ends of the full-control device at the turn-off moment of the full-control device. The invention realizes effective protection of the current source type converter.
Description
Technical Field
The invention belongs to the technical field of high-voltage power electronic devices, and particularly relates to a protection device and a protection method for a current source type converter.
Background
An Integrated Gate Commutated Thyristor (IGCT) is a fully-controlled high-power semiconductor device, has the advantages of low pass voltage drop, turn-on loss and controllable turn-off of an IGBT device, and is a representative device developed in the field of fully-controlled high-power electronic devices.
With the domestic innovation based on the theory of high-power semiconductor devices and manufacturing processes, the domestic IGCT device development makes a major breakthrough, and has the batch production capacity of 8000kV/3000A devices. The continuous technical breakthrough of the high-power electronic device IGCT brings hope for the development and application of a high-power IGCT current source type converter.
The high-power direct current converter needs to bear voltage and current in complex forms and severe stress under a large-load operation condition, the technical difficulty is extremely high, the high-quality development from the technical introduction to the independent research and development for decades in China is passed, and the technical route of the current domestic mainstream converter is a thyristor half-controlled current source type converter based on power grid commutation and a voltage source type converter based on an insulated gate bipolar transistor. The power density and voltage grade of the thyristor semi-controlled current source type converter are easy to improve, but the technical defect of phase commutation failure exists. The voltage source type converter of the insulated gate bipolar transistor is flexible to control, but the problems of low power density, high difficulty in voltage level promotion and high equipment cost caused by large volume and heavy mass cannot be solved all the time, and all adopted semiconductor devices are imported abroad, so that the threat to the electric power development of China is caused. The development and application of the IGCT current source type current converter based on nationally produced IGCT devices break the technical blockade of foreign countries, and complete technology and equipment nationally produced are realized.
The main key technology of the ultra/extra-high voltage current source type converter based on the full-control device is the development of the device, and the mass production of the full-control IGCT device with the current 8kV voltage level is realized; on the other hand, the key technology is to develop a high-voltage electronic system of the current source converter formed by the fully controlled device, wherein the high-voltage electronic system comprises a high-voltage electronic device (a device capable of controlling the on/off of the IGCT device and monitoring whether the IGCT device has faults or not on line) and the protection of the high-voltage electronic device.
At present, an ultra/extra-high voltage current source converter electronic device based on an IGCT fully-controlled device mainly realizes the functions of on-control, off-control and on-line monitoring of a straight-string IGCT valve string, and an IGCT electronic device realized in the prior art, for example, a chinese patent with publication number CN113497545A, discloses a driving device of an IGCT, which includes a gate driving unit, an energy taking unit, a first switch, a second switch, a voltage stabilizing unit, a sampling unit and a control unit, wherein: the gate driving unit is used for being connected with a gate of the IGCT device; the energy obtaining unit is used for being connected with the IGCT device in parallel so as to obtain energy by utilizing the voltage at two ends of the IGCT device, and comprises: the first energy-taking module is connected with the IGCT device in parallel, and the second energy-taking module is connected with the IGCT device in parallel; the voltage stabilizing unit is connected to the first energy taking module and the second energy taking module through the first switch and the second switch respectively and is connected with the gate pole driving unit; the sampling unit is used for acquiring the energy storage parameters of the first energy acquisition module and the energy storage parameters of the second energy acquisition module; the control unit controls the first switch and the second switch according to the sampling value output by the sampling unit.
As shown in fig. 1, although the above-mentioned patent includes a gate electronic unit, an energy obtaining unit, a first switch, a second switch, a voltage stabilizing unit, a sampling unit and a control unit, it cannot be applied to an ultra/extra-high voltage current source converter based on an ICCT, and the original purpose of the RC branch design is destroyed, mainly because a diode is added to the RC branch, so that the reverse damping effect of the RC loop is disabled, the RC loop cannot absorb the reverse recovery charge of the IGCT device, and the damping effect of the RC branch is destroyed.
Therefore, it is desirable to design a protection device and method for a current source converter to solve the above technical problems.
Disclosure of Invention
In view of the above problems, the present invention provides a protection device for a current source converter, the protection device including a protection circuit, wherein the protection circuit includes:
a damping branch and a damping branch;
the damping branch is used for transferring the main branch current of the current source type converter at the turn-off moment of the full-control device;
the suppression branch circuit is used for suppressing the voltage at two ends of the full-control device at the turn-off moment of the full-control device.
Further, the damping branch comprises a resistor Rs and a capacitor Cs connected in series, wherein,
one end of the capacitor Cs is connected to the anode of the full-control device, and one end of the resistor Rs is connected to the other end of the capacitor Cs.
Furthermore, one end of the suppression branch is connected to the other end of the capacitor Cs, and the other end of the suppression branch is connected to the cathode of the full-control device.
Further, the suppression branch comprises a thyristor SCR1, a resistor R2, a transient diode TVS1, and a metal oxide varistor MOVs, wherein,
the anode of the thyristor SCR1 is connected to the other end of the capacitor Cs, and the cathode of the thyristor SCR1 is connected to the cathode of the full-control device;
the cathode of the transient diode TVS1 is connected with the anode of the thyristor SCR1, and the anode of the cathode of the transient diode TVS1 is connected with one end of the resistor R2;
the other end of the resistor R2 is connected with the cathode of the thyristor SCR 1;
one end of the resistor R1 is connected to one end of the resistor R2, and the other end of the resistor R1 is connected to the control electrode of the thyristor SCR 1;
two ends of the metal oxide piezoresistor MOVs are respectively connected with the anode and the cathode of the thyristor SCR 1.
Furthermore, the protection device also comprises an energy taking circuit, and the energy taking circuit is connected with the protection circuit.
Further, the energy-taking circuit comprises a first control branch, a second control branch, a reverse-flow prevention branch and an energy storage branch, wherein,
two ends of the first control branch are respectively connected to the other end of the resistor Rs and the cathode of the full-control device;
the second control branch is connected with the first control branch in parallel;
one end of the anti-reverse branch is connected with one end of the second control branch;
one end of the energy storage branch is connected to the other end of the anti-reverse branch, and the other end of the energy storage branch is connected to the other end of the second control branch.
Further, the first control branch comprises a diode D1, a cathode of the diode D1 is connected to the other end of the resistor Rs, and an anode of the diode D1 is connected to a cathode of the full-control device.
Further, the second control branch comprises a thyristor SCR2, a resistor R3, a resistor R4, and a transient diode TVS2, wherein,
the anode of the thyristor SCR2 is connected to the cathode of the diode D1, and the cathode of the thyristor SCR2 is connected to the anode of the diode D1;
one end of the resistor R3 is connected to the control electrode of the thyristor SCR2, and the other end of the resistor R3 is connected to the anode of the transient diode TVS 2;
the cathode of the transient diode TVS2 is connected to the cathode of the diode D1;
one end of the resistor R4 is connected to the anode of the diode D1, and the other end of the resistor R4 is connected to the anode of the transient diode TVS 2.
Further, the anti-reverse branch comprises a diode D2, wherein,
the anode of the diode D2 is connected to the anode of the thyristor SCR2, and the cathode of the diode D2 is connected to one end of the energy storage branch.
Further, the energy storage branch comprises a capacitor Cp, wherein,
one end of the capacitor Cp is connected to the cathode of the diode D2, and the other end of the capacitor Cp is connected to the cathode of the thyristor SCR 2.
In another aspect, the present invention further provides a protection method for a current source converter, including:
at the turning-off moment of the full-control device, transferring the main branch current of the current source type converter through the damping branch;
and at the moment of turning off the full-control device, the voltage at two ends of the full-control device is inhibited through the inhibiting branch.
Further, the damping branch comprises a resistor Rs and a capacitor Cs connected in series, wherein,
one end of the capacitor Cs is connected to the anode of the full-control device, and one end of the resistor Rs is connected to the other end of the capacitor Cs.
Furthermore, one end of the suppression branch is connected to the other end of the capacitor Cs, and the other end of the suppression branch is connected to the cathode of the full-control device.
Further, the suppression branch comprises a thyristor SCR1, a resistor R2, a transient diode TVS1, and a metal oxide varistor MOVs, wherein,
the anode of the thyristor SCR1 is connected to the other end of the capacitor Cs, and the cathode of the thyristor SCR1 is connected to the cathode of the full-control device;
the cathode of the transient diode TVS1 is connected to the anode of the thyristor SCR1, and the anode of the cathode of the transient diode TVS1 is connected to one end of the resistor R2;
the other end of the resistor R2 is connected with the cathode of the thyristor SCR 1;
one end of the resistor R1 is connected to one end of the resistor R2, and the other end of the resistor R1 is connected to the control electrode of the thyristor SCR 1;
two ends of the metal oxide piezoresistor MOVs are respectively connected with the anode and the cathode of the thyristor SCR 1.
The invention provides a protection device and a method for a current source type converter, which are based on a fully-controlled device current source converter, and gradually replace a semi-controlled current source converter to form a high-power converter indispensable to the construction of a novel power system.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
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 embodiments or the description of 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 shows a circuit diagram of a drive device for an IGCT according to the prior art.
Fig. 2 shows a circuit diagram of a high potential energy-taking device based on an IGCT converter valve according to the prior art.
Fig. 3 shows a circuit diagram of a protection circuit according to an embodiment of the invention.
Fig. 4 shows a circuit diagram of an energy scavenging circuit according to an embodiment of the invention.
Fig. 5 shows a schematic structural diagram of a discrete high-voltage electronic device according to an embodiment of the invention.
Fig. 6 illustrates a schematic connection between a first interface region and a second interface region according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The invention provides a protection device for a current source type converter, which comprises a protection circuit, wherein the protection circuit comprises:
a damping branch and a damping branch;
the damping branch is used for transferring the main branch current of the current source type converter at the turn-off moment of the IGCT, wherein the IGCT includes but is not limited to IGCT, and the IGCT is taken as an example for explanation;
the suppression branch is used for suppressing the voltage across the IGCT (between the anode and the cathode of the IGCT) at the moment of the turn-off of the IGCT.
The following is a detailed description.
As shown in fig. 3, the main branch current of the current source converter flows through the IGCT, energy (main branch current) is transferred to the damping branch circuit due to the moment the IGCT is turned off, and at this moment the damping branch circuit flows in the surge current (the surge current flows too much, which causes the IGCT to break down by overvoltage). Therefore, in order to suppress the voltage across the IGCT and protect the high voltage electronics at the back end of the protection circuit, a suppression branch is provided for protection.
In this embodiment, for the damping branch, specifically, the damping branch includes a resistor Rs and a capacitor Cs connected in series, one end of the capacitor Cs is connected to the anode of the IGCT, and one end of the resistor Rs is connected to the other end of the capacitor Cs.
In this embodiment, for the suppression branch, one end of the suppression branch is connected to the other end of the capacitor Cs, and the other end of the suppression branch is connected to the cathode of the IGCT, specifically:
the suppression branch comprises a thyristor SCR1, a resistor R2, a transient diode TVS1 and a metal oxide varistor MOVs, wherein,
the anode of the thyristor SCR1 is connected to the other end of the capacitor Cs, and the cathode of the thyristor SCR1 is connected to the cathode of the IGCT;
the cathode of the transient diode TVS1 is connected to the anode of the thyristor SCR1, and the anode of the cathode of the transient diode TVS1 is connected to one end of the resistor R2;
the other end of the resistor R2 is connected with the cathode of the thyristor SCR 1;
one end of the resistor R1 is connected with one end of the resistor R2, and the other end of the resistor R1 is connected with the control electrode of the thyristor SCR 1;
two ends of the metal oxide piezoresistor MOVs are respectively connected with the anode and the cathode of the thyristor SCR 1.
When the damping branch passes through surge current, the voltage at two ends of the resistor Rs is increased, the transient diode TVS1 is firstly conducted, so that the thyristor SCR1 is triggered (surge current mainly flows through the thyristor SCR 1), and the metal oxide piezoresistor MOVs is used as backup protection, so that the effects of inhibiting the voltage at two ends of the IGCT and protecting a high-voltage electronic device are achieved.
In the prior art, for example, chinese patent publication No. CN114123730A discloses a high potential energy-taking device based on an IGCT converter valve, which includes a thyristor bypass module, a thyristor trigger module, a rectifier module, an energy storage module, and a DC/DC isolation power supply module; the output end of the IGCT converter valve is connected to the input end of the energy storage module through the rectifying module, and the energy storage module is charged by using the damping current of the IGCT converter valve through the rectifying module; the thyristor trigger module is connected with the energy storage module through the thyristor bypass module, when the charging voltage of the energy storage module reaches a preset charging threshold value, the thyristor trigger module outputs a trigger signal to the thyristor bypass module, and the thyristor bypass stops charging the energy storage module according to the trigger signal.
As shown in fig. 2, the patent can effectively obtain stable energy, although the damping action of the RC circuit is retained. But when the IGCT converter valve is turned off, an inrush current of 5.5kA to 6kA is generated, and the patent does not mention how to protect the energy extraction circuit. If the diode D with higher surge level capability is selected, great difficulty is brought to the design of the current valve, and based on the fact that the protection device further comprises an energy taking circuit, the energy taking circuit is connected with the protection circuit. Because the IGCT uses a high-power gate control current, the energy-taking circuit is required to supply power to the high-voltage electronic device in a high-power supply mode. Wherein, for the circuit of getting energy, it is specific:
the energy taking circuit comprises a first control branch circuit, a second control branch circuit, an anti-reverse branch circuit and an energy storage branch circuit. The following is a detailed description.
Two ends of the first control branch are respectively connected with the other end of the resistor Rs and the cathode of the IGCT;
the second control branch is connected with the first control branch in parallel;
one end of the anti-reverse branch is connected with one end of the second control branch;
one end of the energy storage branch is connected to the other end of the anti-reverse branch, and the other end of the energy storage branch is connected to the other end of the second control branch.
As shown in fig. 4, for the first control branch, specifically:
the first control branch includes a diode D1, a cathode (i.e., terminal a in fig. 4) of the diode D1 is connected to the other end (terminal a in fig. 3) of the resistor Rs, and an anode (i.e., terminal B in fig. 4) of the diode D1 is connected to a cathode (i.e., terminal B in fig. 3) of the IGCT.
For the second control branch, specifically:
the second control branch comprises a thyristor SCR2, a resistor R3, a resistor R4, and a transient diode TVS2, specifically:
the anode of the thyristor SCR2 is connected with the cathode of the diode D1, and the cathode of the thyristor SCR2 is connected with the anode of the diode D1;
one end of the resistor R3 is connected with the control electrode of the thyristor SCR2, and the other end of the resistor R3 is connected with the anode of the transient diode TVS 2;
one end of the resistor R4 is connected to the anode of the diode D1, and the other end of the resistor R4 is connected to the anode of the transient diode TVS 2;
the cathode of the transient diode TVS2 is connected to the cathode of the diode D1.
When the voltage (the voltage at the two ends of the diode D2) exceeds the action voltage (the conduction voltage) of the transient diode TVS2, the transient diode TVS2 is conducted, and the branch where the transient diode TVS2 and the resistor R4 are located is also conducted, so that the voltage at the two ends of the resistor R3 can trigger the thyristor SCR2 to be turned on, and the large current can flow through the thyristor SCR2 (the size of the resistor R3 is adjusted, and the size of the current flowing through the transient diode TVS2 can be limited).
For the anti-reverse branch, in particular:
the anti-reverse branch comprises a diode D2, the anode of the diode D2 is connected with the anode of the thyristor SCR2, and the cathode of the diode D2 is connected with one end of the energy storage branch.
For the energy storage branch, specifically:
the energy storage branch circuit comprises a capacitor Cp, one end of the capacitor Cp is connected to the cathode of the diode D2, and the other end of the capacitor Cp is connected to the cathode of the thyristor SCR 2.
The power supply of the high-voltage electronic device is directly obtained at two ends (between two ends Vc-K in figure 4) of the capacitor Cp (the diode D2 can prevent the reverse current circulation when the capacitor Cp is discharged), when dv/dt between the end A and the end B is larger than 0, the capacitor Cp is charged, when dv/dt between the end A and the end B is smaller than 0, the diode D1 is conducted, and the damping branch circuit is under the normal working condition (the normal working condition comprises the normal conduction of IGCT). Due to the existence of the protection circuit, an energy taking part of the high-voltage electronic device can adopt an electronic power device, that is, all electrical elements in the energy taking circuit in the embodiment can adopt low-power electrical elements, so that the volume of the energy taking circuit is reduced.
The embodiment also discloses a protection method for the current source converter, which comprises the following steps:
at the moment of turning off the IGCT, transferring the main branch current of the current source type converter through the damping branch circuit;
and at the moment of switching off the IGCT, the voltage at two ends of the IGCT is inhibited through the inhibiting branch circuit.
The branch circuits used in the protection method for a current source converter in this embodiment are the same as the branch circuits in the protection device for a current source converter, and are not described herein again.
In addition, the IGCT adopts high-power gate current and requires that the gate stray inductance is less than 10nH, so that the high-voltage electronic device of the existing IGCT device is designed into a whole. Although the integrated electronic device can meet the requirement of a gate pole on stray inductance, the integrated electronic device has great difficulty in the application of an actual ultra/extra-high voltage current source converter; one is that the reserved design space is limited; secondly, engineering application and maintenance are difficult; and thirdly, the structure is not suitable for the ultra/extra-high voltage current source type converter based on a full-control device, namely, the integrally designed high-voltage electronic device cannot be separated, and the maintainability and the overhaul operability are low.
Because the high-voltage electronic device of the IGCT device is designed based on an integral mode at present, particularly a high-power IGCT device used in an ultra/extra-high voltage current source type converter, the required turn-off current is up to 6250A, but the existing discrete high-voltage electronic device is not realized.
Therefore, the present embodiment also provides a discrete high-voltage electronic device. The discrete high voltage electronic device is described in detail below.
As shown in fig. 5, the discrete high-voltage electronic device includes a first discrete module and a second discrete module, the first discrete module includes a first interface region, the second discrete module includes a second interface region, and the first interface region and the second interface region are connectable.
The first discrete module further comprises an outer interface area and a logic unit, wherein the outer interface area and the first interface area are connected with the logic unit, and the first discrete module comprises:
the external interface area includes an interface a and an interface B, where the terminal a and the terminal B of the protection circuit may be respectively connected to the interface a and the interface B, that is, the other terminal of the resistor Rs (terminal a in fig. 3) is connected to the interface a, and the cathode of the IGCT (terminal B in fig. 3) is connected to the interface B.
The logic unit is further connected with an energy-extracting power region, which may also include the energy-extracting circuit, i.e., at this time, the cathode (end a in fig. 4) of the diode D1 in the energy-extracting circuit may be connected to the interface a, and the anode of the diode D1 in the energy-extracting circuit may be connected to the interface B, so that the power supply of the logic unit in the discrete high-voltage electronic device of this embodiment may be directly obtained at two ends (between two ends Vc-K in fig. 4) of the capacitor Cp.
The cathode and the anode (terminal B in fig. 4) of the diode D1 are connected to the other end (terminal a in fig. 3) of the resistor Rs and the cathode (terminal B in fig. 2) of the IGCT, respectively.
The second discrete module further includes a power unit, and the power unit is connected to the second interface region, where the power unit includes a power device, a control device, and a charge storage ring, and in this embodiment, the power device includes but is not limited to an IGCT device, and in this embodiment, the IGCT device is taken as an example for description.
As shown in fig. 6, the first interface region and the second interface region are connected by a first connection layer (connection layer 1), a second connection layer (connection layer 2), a third connection layer (connection layer 3), and a fourth connection layer (connection layer 4); that is, the control signals (the control signals include a control trigger signal, a control turn-off signal, and a steady-state injection signal) can be transmitted between the first interface region and the second interface region through the connection layer 1, the connection layer 2, the connection layer 3, and the connection layer 4.
The outer interface area also includes an optical signal interface, the optical signal interface is connectable to an optical fiber, and a transmission signal transmitted through the optical fiber (the signal includes a turn-on signal, a turn-off signal, and a steady-state signal) may be transmitted to the logic unit through the optical signal interface, specifically:
the conducting signal transmitted by the optical fiber can be transmitted to the logic unit through the optical signal interface, and the logic unit issues a control trigger instruction according to the conducting signal;
the turn-off signal transmitted by the optical fiber can be transmitted to the logic unit through the optical signal interface, and the logic unit issues a turn-off control instruction according to the turn-off signal;
the steady state signal transmitted by the optical fiber can be transmitted to the logic unit through the optical signal interface, and the logic unit issues a steady state injection instruction according to the steady state signal;
the control triggers, controls shuts down, and steady state injection of these instructions are accomplished as follows:
the control triggers the main completion process: when the logic unit issues a control trigger command (signal), the control trigger signal is transmitted to the second interface region through the first interface region. The control device can control positive charges in the charge storage ring to flow in a forward direction according to the control trigger signal transmitted to the second interface region, so that a gate-cathode of the IGCT device is triggered, and the injection of carriers is realized (namely the IGCT device is turned on at the moment).
Controlling the shutdown to mainly complete the process: when the logic unit issues a control turn-off command (signal), the control turn-off signal is transmitted to the second interface region through the first interface region. The control device can control the positive charge in the charge storage ring to flow negatively according to the control turn-off signal transmitted to the second interface region, so that the carriers between the gate and the cathode of the IGCT device are extracted (namely, the IGCT device is turned off at the moment).
The steady state injection mainly completes the process: after the IGCT device is turned on, the logic unit issues a steady-state injection command (signal), and the steady-state injection signal is transmitted to the second interface area through the first interface area. The control device can control positive charge in the charge storage ring to flow positively and stably according to a steady injection signal transmitted to the second interface region, so that positive charge can flow stably between a gate and a cathode of the IGCT device.
In addition, in this embodiment, the logic unit can also monitor whether the IGCT device fails in real time (on-line), that is, the logic unit can detect the voltage and current between the cathode and the anode of the IGCT device, and the logic unit can output the detected voltage and current values between the cathode and the anode of the IGCT device through the optical signal interface and the optical fiber (i.e., determine whether the IGCT device is working normally according to the output voltage and current values).
The discrete electronic device provided by the embodiment meets the stray impedance requirement of turning off a large current on one hand, and solves the difficulty in practical application (engineering application and maintenance) on the other hand.
The whole current source type converter can comprise a protection circuit and an energy acquisition circuit, and also comprises a discrete electronic device, is a current source type converter based on a full-control device, can be widely used for ultra/extra-high voltage current source type converters, and can comprehensively and effectively promote the technical progress and development of China in the ultra/extra-high voltage power transmission field.
Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present invention.
Claims (14)
1. A protection device for a current source converter, the protection device comprising a protection circuit, wherein the protection circuit comprises:
a damping branch and a damping branch;
the damping branch is used for transferring the main branch current of the current source type converter at the turn-off moment of the full-control device;
and the suppression branch is used for suppressing the voltage at two ends of the full-control device at the turn-off moment of the full-control device.
2. A protection arrangement for a current source converter according to claim 1, characterized in that said damping branch comprises a resistor Rs and a capacitor Cs connected in series, wherein,
one end of the capacitor Cs is connected to the anode of the full-control device, and one end of the resistor Rs is connected to the other end of the capacitor Cs.
3. The protection device for the current source converter according to claim 2, wherein one end of the suppressing branch is connected to the other end of the capacitor Cs, and the other end of the suppressing branch is connected to the cathode of the fully controlled device.
4. A protection device for a current source converter according to claim 3, characterized in that said suppression branch comprises a thyristor SCR1, a resistor R2, a transient diode TVS1 and a metal oxide varistor MOVs, wherein,
the anode of the thyristor SCR1 is connected to the other end of the capacitor Cs, and the cathode of the thyristor SCR1 is connected to the cathode of the full-control device;
the cathode of the transient diode TVS1 is connected with the anode of the thyristor SCR1, and the anode of the transient diode TVS1 is connected with one end of the resistor R2;
the other end of the resistor R2 is connected with the cathode of the thyristor SCR 1;
one end of the resistor R1 is connected to one end of the resistor R2, and the other end of the resistor R1 is connected to the control electrode of the thyristor SCR 1;
two ends of the metal oxide piezoresistor MOVs are respectively connected with the anode and the cathode of the thyristor SCR 1.
5. A protection device for a current source converter according to claims 2-4 further comprising an energy extraction circuit connected to the protection circuit.
6. The protection device for a current source converter according to claim 5, wherein the energy extracting circuit comprises a first control branch, a second control branch, a reverse-current preventing branch and an energy storage branch, wherein,
two ends of the first control branch are respectively connected to the other end of the resistor Rs and the cathode of the full-control device;
the second control branch is connected with the first control branch in parallel;
one end of the anti-reverse branch is connected with one end of the second control branch;
one end of the energy storage branch is connected to the other end of the reverse flow preventing branch, and the other end of the energy storage branch is connected to the other end of the second control branch.
7. A protection arrangement for a current source converter according to claim 6 wherein the first control branch comprises a diode D1, the cathode of the diode D1 being connected to the other end of the resistor Rs, and the anode of the diode D1 being connected to the cathode of the fully controlled device.
8. A protection arrangement for a current source converter according to claim 7, characterized in that said second control branch comprises a thyristor SCR2, a resistor R3, a resistor R4 and a transient diode TVS2, wherein,
the anode of the thyristor SCR2 is connected to the cathode of the diode D1, and the cathode of the thyristor SCR2 is connected to the anode of the diode D1;
one end of the resistor R3 is connected to the control electrode of the thyristor SCR2, and the other end of the resistor R3 is connected to the anode of the transient diode TVS 2;
the cathode of the transient diode TVS2 is connected with the cathode of the diode D1;
one end of the resistor R4 is connected to the anode of the diode D1, and the other end of the resistor R4 is connected to the anode of the transient diode TVS 2.
9. A protection arrangement for a current source converter according to claim 7, wherein said anti-reverse branch comprises a diode D2, wherein,
the anode of the diode D2 is connected with the anode of the thyristor SCR2, and the cathode of the diode D2 is connected with one end of the energy storage branch.
10. A protection device for a current source converter according to claim 7, characterized in that said energy storage branch comprises a capacitor Cp, wherein,
one end of the capacitor Cp is connected to the cathode of the diode D2, and the other end of the capacitor Cp is connected to the cathode of the thyristor SCR 2.
11. A protection method for a current source converter, the method comprising:
at the turn-off moment of the full-control device, transferring the main branch current of the current source type converter through the damping branch circuit;
and at the moment of turning off the full-control device, the voltage at two ends of the full-control device is inhibited through the inhibiting branch.
12. A protection method for a current source converter according to claim 11, characterized in that said damping branch comprises a resistor Rs and a capacitor Cs connected in series, wherein,
one end of the capacitor Cs is connected to the anode of the full-control device, and one end of the resistor Rs is connected to the other end of the capacitor Cs.
13. The protection method for the current source converter according to claim 12, wherein one end of the suppression branch is connected to the other end of the capacitor Cs, and the other end of the suppression branch is connected to a cathode of the fully controlled device.
14. A protection method for a current source converter according to claim 13, characterized in that said suppression branch comprises a thyristor SCR1, a resistor R2, a transient diode TVS1 and a metal oxide varistor MOVs, wherein,
the anode of the thyristor SCR1 is connected to the other end of the capacitor Cs, and the cathode of the thyristor SCR1 is connected to the cathode of the full-control device;
the cathode of the transient diode TVS1 is connected with the anode of the thyristor SCR1, and the anode of the cathode of the transient diode TVS1 is connected with one end of the resistor R2;
the other end of the resistor R2 is connected with the cathode of the thyristor SCR 1;
one end of the resistor R1 is connected to one end of the resistor R2, and the other end of the resistor R1 is connected to the control electrode of the thyristor SCR 1;
two ends of the metal oxide piezoresistor MOVs are respectively connected with the anode and the cathode of the thyristor SCR 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211059638.3A CN115580123A (en) | 2022-09-01 | 2022-09-01 | Protection device and method for current source type current converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211059638.3A CN115580123A (en) | 2022-09-01 | 2022-09-01 | Protection device and method for current source type current converter |
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