CN113394961B - Switch sub-module of composite energy consumption device and protection method thereof - Google Patents
Switch sub-module of composite energy consumption device and protection method thereof Download PDFInfo
- Publication number
- CN113394961B CN113394961B CN202110554171.9A CN202110554171A CN113394961B CN 113394961 B CN113394961 B CN 113394961B CN 202110554171 A CN202110554171 A CN 202110554171A CN 113394961 B CN113394961 B CN 113394961B
- Authority
- CN
- China
- Prior art keywords
- voltage
- branch
- thyristor
- resistor
- capacitor
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a switch submodule of a composite energy-consuming device and a protection method thereof, wherein the switch submodule comprises: a thyristor branch, a static voltage equalizing branch and a voltage clamping branch; wherein the thyristor branch, the static voltage equalizing branch and the voltage clamping branch are connected in parallel. The invention can avoid the problem of improving the damage rate due to the fact that devices bear different voltages, solves the problem caused by the failure of single submodule in refusing to operate, and also avoids the problem that the whole energy consumption device is broken and damaged in the energy consumption period due to the damage of the metal oxide arrester.
Description
Technical Field
The invention belongs to the field of direct current transmission, and particularly relates to a switch submodule of a composite energy-consuming device and a protection method thereof.
Background
The direct current energy consumption device is an important device for protecting the safe and stable operation of the system in a high-voltage direct current transmission system (modular multilevel converterbased high voltage direct current, MMC-HVDC system) based on the modularized multi-level converter, and can consume surplus power of the system through an energy consumption resistor inside the device during the fault of a receiving-end alternating current power grid, so that serious consequences caused by the accumulation of energy of the system in the capacitance of a converter valve submodule of the modularized multi-level converter (modular multilevel converter, MMC) are avoided.
The resistance centralized DC energy dissipation device is a structure which uses a large number of high-power semiconductor switch submodules and a centralized energy dissipation resistor to be connected in series, as shown in figure 1, the switch string adopts a control mode of the same switch and the same switch, and the DC energy dissipation device comprises two semiconductor switches S arranged in series p And switch S N And a centralized energy dissipation resistor R connected in parallel with the switch S p Switch S N Capacitor C of centralized energy dissipation resistor R f The purpose of matching surplus power change of the system is achieved by changing the switching duty ratio in a single energy consumption period. Because of the problem of the manufacturing process, the non-uniform voltage phenomenon exists between the switches connected in series, so that devices bear different voltages, and the damage rate is improved.
In order to solve the problem, a metal oxide arrester (Metal Oxide Varistor, MOV) composite sub-module is proposed in the prior art, namely, MOVs are connected in parallel with semiconductor switch sub-modules, overvoltage fluctuation of the semiconductor switch sub-modules is limited by voltage clamping function of the MOVs, and static voltage equalizing between the regulating sub-modules is realized by piezoresistance characteristics of the MOVs.
However, when a single semiconductor switch sub-module fails in a direct-string manner, the rest sub-modules are normally conducted, so that system direct current can directly pass through the energy consumption device, and under the working condition, thousands of amperes of large current can pass through the MOV branch of the refusing sub-module, so that the MOV can absorb a large amount of energy in a few seconds of energy consumption time and be damaged rapidly. The MOV resistor chip cracks, the shell melts and loses, a large amount of smog, sparks and electric arcs are sprayed out from the pressure release holes, the serious influence is caused on other components of the switching submodule of the energy-consuming device, particularly on a more sensitive semiconductor switch, and finally the whole energy-consuming device can be broken and damaged during energy consumption.
Disclosure of Invention
In view of the above problems, the present invention provides a switch sub-module of a composite energy dissipation device and a protection method thereof, which avoid the problem of increasing the damage rate due to the different voltages born between the devices.
In order to achieve the above purpose, the invention adopts the following technical scheme: a composite energy dissipation device switch sub-module, the switch sub-module comprising: a thyristor branch, a static voltage equalizing branch and a voltage clamping branch;
wherein the thyristor branch, the static voltage equalizing branch and the voltage clamping branch are connected in parallel.
Optionally, the thyristor branch comprises a thyristor and a diode;
the cathode of the diode is connected with the anode of the thyristor, and the anode of the diode is connected with the cathode of the thyristor.
Optionally, the thyristor is an integrated gate commutated thyristor.
Optionally, the static voltage equalizing branch comprises one or more first resistors.
Optionally, the voltage clamping branch comprises a second resistor, a capacitor and a metal oxide arrester;
the second resistor is connected in series with the capacitor, and the metal oxide arrester is connected in parallel with the capacitor.
And a switching circuit comprising a switching leg and a capacitive leg in parallel, the switching leg comprising:
one or more of the above-described switch sub-modules connected in series; and
and the energy dissipation resistor is connected with the switch submodule in series.
And a method for protecting a circuit by using a switch sub-module, wherein the switch sub-module is the switch sub-module, and the method comprises the following steps:
current flows into the voltage clamping branch until reaching the breakdown voltage of the thyristor branch;
and the broken thyristor branch circuit bypasses the voltage clamping branch circuit.
Optionally, the voltage clamping branch comprises a second resistor, a capacitor and a metal oxide arrester; the second resistor is connected in series with the capacitor, and the metal oxide arrester is connected in series with the capacitor, and in the step of flowing current into the voltage clamping branch until reaching the breakdown voltage of the thyristor branch, the method comprises the following steps:
the current flows through the second resistor to charge the capacitor until the voltage at two ends of the capacitor reaches the residual voltage of the metal oxide arrester;
and the sum of the voltages at the two ends of the second resistor and the voltage reaches the breakdown voltage of the thyristor branch circuit.
By adopting the technical scheme, the invention has the following beneficial effects: the problem that the damage rate is improved due to the fact that different voltages are born between devices is avoided, the problem caused by single submodule refusing to operate faults is solved, and the problem that the whole energy consumption device is broken and damaged in the energy consumption period due to the fact that the metal oxide lightning arrester is damaged is also avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a schematic diagram of the overall circuit structure of the prior art;
FIG. 2 shows a schematic diagram of an overall circuit configuration according to an embodiment of the invention;
fig. 3 is a schematic circuit diagram of a voltage clamping branch circuit according to an embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The switch submodule of the composite energy dissipation device provided by the embodiment of the invention comprises: a thyristor branch, a static voltage equalizing branch and a voltage clamping branch; wherein the thyristor branch, the static voltage equalizing branch and the voltage clamping branch are connected in parallel.
Preferably, as shown in fig. 2, the thyristor branch comprises a thyristor and a diode, wherein the cathode of the diode is connected with the anode of the thyristor, and the anode of the diode is connected with the cathode of the thyristor.
In this embodiment, the thyristor is an integrated gate commutated thyristor (Intergrated Gate Commutated Thyristors, hereinafter abbreviated as IGCT), the collector of the integrated gate commutated thyristor is connected to the circuit in the circuit inflow direction of the main circuit, and the emitter is connected to the direction in which the main circuit flows out. The flow guiding direction of the diode is opposite to the flow guiding direction of the IGCT, wherein the anode of the diode is connected with the emitter of the IGCT, and the cathode of the diode is connected with the emitter of the IGCT. The diode prevents the IGCT from bearing pressure reversely so as to prevent the IGCT from being damaged. In the scheme, the IGCT has stronger through-current capability, higher maximum turn-off current, smaller turn-on and turn-off loss and lower operation failure rate, and has the characteristics of being capable of entering a long-time stable failure short-circuit state after failure and protecting the safety of a tandem switch structure.
Preferably, the static equalizing branch comprises one or more first resistors R std First resistor R std The static voltage equalizing function is realized in the circuit.
Preferably, the voltage clamping branch comprises a second resistor R S Capacitance C S And a metal oxide arrester (MOV hereinafter), as shown in FIG. 2, the second resistor R S And the capacitor C S In series with the metal oxide arrester MOV and the capacitor C S And are connected in parallel. The voltage clamping branch is capable of passing not only through the RC structure (second resistance R S Capacitor C S ) The voltage change rate of the switch sub-module is reduced, the overvoltage condition of the switch sub-module can be restrained by the voltage clamping effect of the MOV, and the voltage clamping effect is combined with the first resistor R std Providing dynamic and static pressure equalizing assistance.
The dc energy dissipation device is used as a switching circuit, and includes a plurality of semiconductor switches and energy dissipation resistors connected in series, as shown in fig. 1, the present embodiment uses two semiconductor switches as an example, and as shown in fig. 1 and 2, the switch submodule of the present embodiment replaces the semiconductor switch S in the dc energy dissipation device p To avoid the semiconductor switch S in the DC power dissipation device p The situation that the whole energy consumption device is broken and damaged during energy consumption occurs when the operation is refused. Preferably, other semiconductor switches (e.g., S N ) And also replaced by a switch sub-module in an embodiment of the invention.
In the normal operation state of the dc energy consuming device, when the series-connected switching submodules are closed, as shown in fig. 3, the system current I dc Will flow through IGCT and consumeAn energy resistance R; when the series switch is turned off, the system current I due to the presence of reactance in the device dc Will flow through the voltage clamping branch without change in size, at which time the second resistor R S The voltage across has a maximum value. The current is capacitor C S And charging, wherein the voltage at two ends of the voltage clamping branch is gradually increased. When the MOV has voltage clamping effect and reaches the highest voltage value, the current passing through the voltage clamping branch is not the maximum value, the second resistor R S The voltage across the capacitor is reduced, the structure will capacitor C S And a second resistor R S The voltage maximum value of the (C) is staggered, so that the safety of the IGCT switch is protected.
Referring to fig. 2 and 3, the method for protecting a circuit by using a switch sub-module according to the embodiment of the present invention is implemented based on the switch sub-module of the composite energy dissipation device according to the embodiment of the present invention, where the method includes:
when single switch sub-module refuses to operate, system current I dc Will pass through the voltage clamping branch entirely to become capacitor C S Charging is carried out until the voltage across it reaches the residual voltage of the MOV. And at this time the second resistor R S There is also a maximum value for the voltage across the two parts, the sum of which will exceed the maximum operating voltage of the IGCT. Due to the characteristic of stable short circuit after breakdown of the IGCT, the IGCT is broken down and maintained in a short circuit state under the condition of fault, so that a fault switch sub-module is bypassed from the device, and the safe operation of the whole device is protected.
In this embodiment, the choice of parameters for the components in the circuit module structure depends on the breakdown voltage of the IGCT used. When the switch sub-module refuses to operate and other switch sub-modules are conducted, rated direct current I of the power transmission system dc Will pass through a second resistor R S Is a capacitor C S Charging a second resistor R S The voltage at both ends is U r Capacitance C S The voltage at both ends gradually rises to the MOV residual voltage level U res . Under this condition, the voltage across the IGCT is
U sm ＝U res +U r ＝U res +I dc R s 。
Voltage U sm The breakdown voltage of the IGCT is reached after the two voltages are superimposed, thereby breaking down and maintaining it in a stable failure short circuit state. When the voltage level exceeds the highest withstand voltage of the IGCT, the IGCT will break down in hundreds of microseconds to milliseconds, bypassing the voltage clamp bypass structure, avoiding severe damage to the MOV and its resulting secondary hazard at high current levels.
Under the condition that the direct current energy consumption device normally operates, the switch submodule can pass through a capacitor C S U is set to res And U r The peak of the IGCT is staggered, so that the false breakdown of the IGCT under the normal working condition is avoided.
The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical matters of the present invention can be made by those skilled in the art without departing from the scope of the present invention.
Claims (6)
1. A composite energy dissipation device switch sub-module, the switch sub-module comprising: a thyristor branch, a static voltage equalizing branch and a voltage clamping branch;
wherein the thyristor branch, the static voltage equalizing branch and the voltage clamping branch are connected in parallel, the thyristor is an integrated gate commutated thyristor IGCT, and the voltage clamping branch comprises a second resistor R S Capacitance C S And a metal oxide arrester MOV; the second resistor R S And the capacitor C S In series with the metal oxide arrester MOV and the capacitor C S Parallel connection; wherein, under the normal working state of the energy consumption device, when the series-connected switch submodules are closed, the system current I dc Will flow through IGCT, system current I dc Will flow through the voltage clamping branch without change in size, at which time the second resistor R S The voltage at two ends has the maximum value; system current I dc Is a capacitor C S Charging, wherein the voltage at two ends of the voltage clamping branch is gradually increased; when the MOV has voltage clamping effect and reaches the highest voltage value, the second resistor R S Voltage across the capacitor C is reduced S And a second resistor R S The voltage peaks of (2) are staggered.
2. The switch sub-module of claim 1, wherein the thyristor branch comprises a thyristor and a diode;
the cathode of the diode is connected with the anode of the thyristor, and the anode of the diode is connected with the cathode of the thyristor.
3. The switching sub-module of claim 1, wherein the static voltage equalizing leg comprises one or more first resistors.
4. A switching circuit comprising a switching leg and a capacitive leg in parallel, the switching leg comprising:
one or more switch sub-modules as claimed in any one of claims 1-3 connected in series; and
and the energy dissipation resistor is connected with the switch submodule in series.
5. A method of protecting a circuit using a switch sub-module, the switch sub-module being a switch sub-module as claimed in any one of claims 1 to 4, the method comprising:
current flows into the voltage clamping branch until reaching the breakdown voltage of the thyristor branch;
and the broken thyristor branch circuit bypasses the voltage clamping branch circuit.
6. The method of claim 5, the voltage clamping leg comprising a second resistor, capacitor, and metal oxide arrester; the second resistor is connected in series with the capacitor, and the metal oxide arrester is connected in series with the capacitor, and is characterized in that in the step of flowing current into the voltage clamping branch until reaching the breakdown voltage of the thyristor branch, the method comprises the following steps:
the current flows through the second resistor to charge the capacitor until the voltage at two ends of the capacitor reaches the residual voltage of the metal oxide arrester;
and the sum of the voltages at the two ends of the second resistor and the voltage reaches the breakdown voltage of the thyristor branch circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110554171.9A CN113394961B (en) | 2021-05-20 | 2021-05-20 | Switch sub-module of composite energy consumption device and protection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110554171.9A CN113394961B (en) | 2021-05-20 | 2021-05-20 | Switch sub-module of composite energy consumption device and protection method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113394961A CN113394961A (en) | 2021-09-14 |
| CN113394961B true CN113394961B (en) | 2023-05-16 |
Family
ID=77618202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110554171.9A Active CN113394961B (en) | 2021-05-20 | 2021-05-20 | Switch sub-module of composite energy consumption device and protection method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113394961B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114221318B (en) * | 2021-12-20 | 2022-09-30 | 华北电力大学 | MMC sub-module circuit topology structure, fault ride-through method and application thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110071518A (en) * | 2019-03-29 | 2019-07-30 | 清华大学 | A kind of combined type direct-current unloading circuit based on arrester |
| CN110308354A (en) * | 2019-07-24 | 2019-10-08 | 王炎 | A kind of multicolumn lightning arrester connected in parallel experimental rig and its test method |
| CN112787317A (en) * | 2019-11-07 | 2021-05-11 | 西安许继电力电子技术有限公司 | Direct current energy consumption device |
| CN111525531B (en) * | 2020-04-16 | 2022-09-23 | 清华大学 | Direct current energy dissipation device containing interelectrode capacitance |
-
2021
- 2021-05-20 CN CN202110554171.9A patent/CN113394961B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN113394961A (en) | 2021-09-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10389262B2 (en) | Device for temporarily taking over electrical current from an energy transfer or distribution device, when needed | |
| EP3335287B1 (en) | Fault current managing branch for surge-less current interruption in dc system | |
| EP3872944A1 (en) | Direct current energy dissipation apparatus and control method therefor | |
| Sano et al. | A surgeless solid-state DC circuit breaker for voltage-source-converter-based HVDC systems | |
| KR101832868B1 (en) | Device for switching a direct current | |
| US9478974B2 (en) | DC voltage circuit breaker | |
| US11258437B2 (en) | Switching device for disconnecting a current path | |
| CN106711931B (en) | Direct current breaker and control method thereof | |
| CN108879623B (en) | Multi-voltage-level direct current network system and control protection method | |
| CN111566885B (en) | Circuit arrangement for combined protection of loads against temporary and transient overvoltages | |
| CN111987706B (en) | Current-limiting type controllable lightning arrester, current converter, power transmission system and control method | |
| CN110535115A (en) | A kind of direct current controllable arrester device | |
| Liu et al. | A novel solid-state switch scheme with high voltage utilization efficiency by using modular gapped MOV for DC breakers | |
| Jakka et al. | Protection design considerations of a 10 kV SiC MOSFET enabled mobile utilities support equipment based solid state transformer (MUSE-SST) | |
| CN113394961B (en) | Switch sub-module of composite energy consumption device and protection method thereof | |
| CN103647263A (en) | DC circuit breaker based on half-control electric-power electronic devices | |
| CN108701563B (en) | Device for switching a direct current in a pole of a direct current network | |
| EP3639360B1 (en) | Converter arrangement having phase module arrester and method for short-circuit protection thereof | |
| CN106711979B (en) | Method and system for suppressing commutation failure of direct-current power transmission system | |
| CN112909986B (en) | Modularized multi-level converter sub-module and control method thereof | |
| Li et al. | DC circuit breaker requirements in multi-terminal HVDC systems | |
| CN212849855U (en) | Energy release device and overvoltage clamping device | |
| WO2013091699A1 (en) | An arrangement for controlling the electric power transmission in a hvdc power transmission system | |
| JP3757030B2 (en) | Surge voltage suppressor | |
| Zaja et al. | Capacitive element for limiting VSC fault current in DC grids |
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 |