CN115706540A - Converter valve module and converter valve - Google Patents
Converter valve module and converter valve Download PDFInfo
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- CN115706540A CN115706540A CN202110897789.5A CN202110897789A CN115706540A CN 115706540 A CN115706540 A CN 115706540A CN 202110897789 A CN202110897789 A CN 202110897789A CN 115706540 A CN115706540 A CN 115706540A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The application provides a converter valve module and a converter valve. A converter valve module comprising: the power supply comprises a semiconductor switch unit, a first direct current energy storage element, a bypass switch, a first resistor, a second resistor, a third diode, a fourth diode, a first power supply module, a DC/DC power supply module, a sub-module control unit and a switch control unit. The converter valve comprises a plurality of cascaded converter valve modules. The energy storage capacitors of the sub-module control unit and the switch control unit are provided with a plurality of paths of power supplies. The resistor at the input end in the power supply loop can be used as a voltage-sharing resistor of the converter valve module at the same time, so that the contradiction between wide-range operating voltage input of the submodule and small allowable range of power supply voltage of the submodule control unit and the energy storage capacitor can be solved; the input voltage of the DC/DC power supply module and the power supply range of the switch energy storage capacitor can be respectively adjusted. The converter valve module has the advantages of simple circuit and good economy, can realize the converter valve module with high reliability, and provides guarantee for the reliable operation of the converter valve.
Description
Technical Field
The application relates to the field of flexible direct current power transmission, in particular to a converter valve module and a converter valve.
Background
The flexible direct current transmission technology is an optimal technical scheme for power grid partition interconnection and new energy scale access.
The flexible direct current converter valve serving as the core of the flexible direct current converter valve adopts a modular multilevel topology and is formed by connecting a plurality of basic unit converter valve modules with the same structures in series. The AC voltage is fitted by controlling the input of the upper bridge arm submodule and the lower bridge arm submodule of the flexible DC converter valve. The sub-modules generally have various structures such as a half-bridge topology and a full-bridge topology. The converter valve submodule consists of elements such as a fully-controlled power device (such as an IGBT), a direct current capacitor, a bypass switch, a submodule control unit, a power device driving board, a power module and the like.
The voltage output by the submodule is controlled by controlling the power device in the submodule of the converter valve to be switched on and off. In order to ensure the reliable operation of the flexible direct current system, the operation of the whole converter valve is not influenced when the converter valve module is in fault, and then a bypass switch is connected in parallel between the output terminals of the converter valve sub-module. When the converter valve module fails, the conduction switch is triggered to enable the sub-module bypass with the failure to exit from operation, so that the whole operation of the converter valve system is not influenced by the failure of a single module.
A submodule control unit and a bypass switch of the converter valve module directly influence whether the flexible direct-current transmission converter valve can normally operate or not, and system safety is concerned. The submodule control unit and the switch control unit of the bypass switch both need the power supply module to supply power, and the reliability of the design of the power supply loop influences the reliability of the submodule.
The conventional submodule control unit usually adopts a high-voltage switching power supply for power supply, the input of the high-voltage switching power supply is directly connected to two ends of an energy storage element of a submodule to get power, and the working voltage of the submodule is converted to the power supply voltage required by the submodule control unit.
The bypass switch of the converter valve module is usually configured with an energy storage capacitor and a switch control unit, the energy storage capacitor provides closing energy for closing the bypass switch, and abnormal energy storage of the energy storage capacitor may cause abnormal bypass closing of the bypass switch. The normal operation of the control unit of the converter valve module and the closing of the bypass switch are both related to the design of a power supply loop of the control unit.
The voltage of the storage capacitor of the bypass switch is typically 200V-400V. Under converter valve operating conditions, the operating voltage of the sub-modules has a wide voltage range, typically 0-4500V. The power supply of the sub-module control unit usually adopts low-voltage direct current power supply, and the typical value is 15V-24V power supply. The power supply voltage of the sub-module control unit, the voltage of the bypass switch energy storage capacitor and the sub-module operation voltage have larger difference.
Therefore, how to combine the operating voltage of the converter valve module, construct a simple and reliable power supply circuit, and realize reliable power supply of the sub-module control unit and the bypass switch is a key for improving the reliability of the converter valve.
Disclosure of Invention
The converter valve module and the converter valve realize high-reliability power supply of the sub-module control unit and the bypass switch, and guarantee reliable operation of the converter valve.
According to an aspect of the present application, a converter valve module is provided, which includes a semiconductor switch unit, a first DC energy storage element, a bypass switch, a first resistor, a second resistor, a third diode, a fourth diode, a first power module, a DC/DC power module, a sub-module control unit, and a switch control unit; wherein:
the semiconductor switch unit comprises a first wire outlet terminal, a second wire outlet terminal, a positive electrode end and a negative electrode end;
the bypass switch is electrically connected with the first outlet terminal and the second outlet terminal;
the switch control unit comprises a first energy storage capacitor and a trigger loop, the first energy storage capacitor is connected with the trigger loop in parallel, and the trigger loop is connected with the bypass switch;
one end of the first direct current energy storage element is electrically connected with the positive electrode end, and the other end of the first direct current energy storage element is electrically connected with the negative electrode end;
after the first resistor, the second resistor and the third resistor are connected in series, one end of the first resistor, the second resistor and the third resistor is electrically connected with the positive end, and the other end of the first resistor, the second resistor and the third resistor is electrically connected with the negative end;
the positive electrode of the third diode is electrically connected with the first resistor and the second resistor in series connection, the negative electrode of the third diode is connected to one end of the DC/DC power supply module, and the other end of the DC/DC power supply module is electrically connected with the positive electrode end;
the anode of the fourth diode is electrically connected with the second resistor and the third resistor in series connection with a lead, the cathode of the fourth diode is electrically connected to one end of the first energy storage capacitor, and the other end of the first energy storage capacitor is electrically connected with the cathode end;
the first power supply module is electrically connected with the semiconductor switch unit, the first energy storage capacitor and the sub-module control unit;
the DC/DC power supply module is electrically connected with the sub-module control unit;
the sub-module control unit is connected with the trigger circuit and enables the trigger circuit to work through a trigger signal.
According to some embodiments, the semiconductor switching cells may be in a half-bridge configuration or a full-bridge configuration.
According to some embodiments, the sub-module control unit may be electrically or optically connected to the trigger circuit. According to some embodiments, the semiconductor switching unit is a half-bridge structure including a first outlet terminal, a second outlet terminal, a positive terminal, a negative terminal, a first turn-off semiconductor, a second turn-off semiconductor, a first freewheeling diode, and a second freewheeling diode, wherein:
the first turn-off semiconductor is connected in anti-parallel with the first freewheeling diode, and the second turn-off semiconductor is connected in anti-parallel with the second freewheeling diode;
the first turn-off semiconductor and the second turn-off semiconductor are connected in series in the same direction;
the anode of the first freewheeling diode is electrically connected with the cathode of the second freewheeling diode;
the negative electrode of the first freewheeling diode is electrically connected with the positive electrode end, the positive electrode of the second freewheeling diode is electrically connected with the negative electrode end, the negative electrode of the second freewheeling diode is electrically connected with the first wire outlet terminal, and the positive electrode of the second freewheeling diode is electrically connected with the second wire outlet terminal.
According to some embodiments, the semiconductor switching unit is in a full-bridge configuration, comprising a first outlet terminal, a second outlet terminal, a positive terminal, a negative terminal, a first turn-off semiconductor, a second turn-off semiconductor, a third turn-off semiconductor, a fourth turn-off semiconductor, a first freewheeling diode, a second freewheeling diode, a third freewheeling diode, and a fourth freewheeling diode, wherein:
the first turn-off semiconductor is connected in anti-parallel with the first freewheeling diode, the second turn-off semiconductor is connected in anti-parallel with the second freewheeling diode, the third turn-off semiconductor is connected in anti-parallel with the third freewheeling diode, and the fourth turn-off semiconductor is connected in anti-parallel with the fourth freewheeling diode;
the first turn-off semiconductor and the second turn-off semiconductor are connected in series in the same direction, the anode of the first free wheel diode is electrically connected with the cathode of the second free wheel diode, the third turn-off semiconductor and the fourth turn-off semiconductor are connected in series in the same direction, and the anode of the third free wheel diode is electrically connected with the cathode of the fourth free wheel diode;
the negative electrode of the first freewheeling diode is electrically connected with the negative electrode of the third freewheeling diode, and the positive electrode of the second freewheeling diode is electrically connected with the positive electrode of the fourth freewheeling diode;
the negative electrode of the first freewheeling diode is electrically connected with the positive electrode end, the second freewheeling diode is electrically connected with the negative electrode end, the negative electrode of the second freewheeling diode is electrically connected with the first wire outlet terminal, and the negative electrode of the fourth freewheeling diode is electrically connected with the second wire outlet terminal.
According to some embodiments, the semiconductor device of the semiconductor switching unit employs an IGBT device.
According to some embodiments, when the semiconductor switch unit is in a half-bridge structure, different voltages can be output between the outgoing line terminals by controlling the turn-on and turn-off of the semiconductor switch unit, wherein:
when the first semiconductor capable of being turned off is turned on and the second semiconductor capable of being turned off is turned off, the output voltage between the first outlet terminal and the second outlet terminal is equal to the voltage of the first direct current energy storage element; or when the second semiconductor capable of being turned off is turned on, the output voltage between the first wire outlet terminal and the second wire outlet terminal is equal to the on-state voltage drop of the second semiconductor capable of being turned off and is approximately 0.
According to some embodiments, when the semiconductor switch unit is in a full-bridge structure, different voltages can be output between the outgoing line terminals by controlling the on and off of the semiconductor switch unit, wherein:
when the first semiconductor capable of being turned off, the second semiconductor capable of being turned on, the third semiconductor capable of being turned on and the fourth semiconductor capable of being turned off are turned off, the output voltage between the first wire outlet terminal and the second wire outlet terminal is equal to the negative voltage of the first direct-current energy storage element; or when the first semiconductor capable of being turned off, the second semiconductor capable of being turned off, the third semiconductor capable of being turned on and the fourth semiconductor capable of being turned off are turned on, the output voltage between the first wire outlet terminal and the second wire outlet terminal is equal to the on-state voltage drop of the first semiconductor capable of being turned off and the third semiconductor capable of being turned off and is approximate to 0; or when the first semiconductor capable of being turned off, the second semiconductor capable of being turned on, the third semiconductor capable of being turned off and the fourth semiconductor capable of being turned on, the output voltage between the first wire outlet terminal and the second wire outlet terminal is equal to the on-state voltage drop of the second semiconductor capable of being turned off and the fourth semiconductor capable of being turned off, and is approximate to 0.
According to some embodiments, the third resistance has a value of 1/5 or less of a sum of the first resistance, the second resistance, and the third resistance.
According to some embodiments, the first resistor, the second resistor are packaged in a single housing, and the third resistor is packaged separately; or the second resistor and the third resistor are packaged in a shell, and the first resistor is packaged separately; or the first resistor, the second resistor and the third resistor are packaged in a shell.
According to some embodiments, the switch control unit further comprises a second energy storage capacitor; the second energy storage capacitor is connected with the first power supply module in parallel; and the power supply loops of the first energy storage capacitor and the second energy storage capacitor are mutually independent.
According to some embodiments, the energy storage element may be a dc capacitor, a battery, or a super capacitor.
According to some embodiments, the sub-module control unit sends the control signal to the trigger circuit when the semiconductor switch unit fails, and the trigger circuit controls the bypass switch to be closed to bypass the failed semiconductor switch unit.
According to some embodiments, the converter valve module further comprises a protection thyristor; and the negative electrode of the protective thyristor is electrically connected with the first wire outlet terminal, and the positive electrode of the protective thyristor is electrically connected with the second wire outlet terminal.
According to some embodiments, the first energy storage capacitor is powered by two loops, wherein: the first energy storage capacitor and the first power supply module are connected in parallel to form a loop for supplying power; the first energy storage capacitor, the first direct current energy storage element, the first resistor, the second resistor and the fourth diode loop supply power.
According to some embodiments, the sub-module control unit is powered by two loops, wherein: the DC/DC power supply module and the sub-module control unit are connected in parallel to form a loop for supplying power; the first power supply module and the sub-module control unit are connected in parallel to supply power.
According to an aspect of the application, a converter valve is provided comprising a number of cascaded converter valve modules as described in any of the preceding.
According to some embodiments, the converter valves are controlled during operation to fit and output a required voltage by cascading the converter valve modules.
Technical solutions according to some embodiments of the present application may have one or more of the following benefits:
(1) The submodule control unit and the bypass switch energy storage capacitor of the converter valve module constructed by the application have redundant power supply loops, and the converter valve module has high power supply reliability.
(2) The operating high voltage of the submodule can be reduced to low voltage by arranging the second resistor R2 and the third resistor R3, and the wide-range working voltage is converted into the stable working voltage required by the power supply of the submodule control unit by configuring the DC/DC power supply module, so that compared with the mode of directly taking power from two ends of the module and converting the power into the power supply of the submodule control unit, the mode has the advantages of low working voltage, low manufacturing cost and the like; the loop power supply voltage can be used as a power supply standby power supply for the submodule control unit, so that the power supply reliability of the submodule control unit is improved.
(3) The contradiction that the wide-range operating voltage input of the submodule is not matched with the power supply voltage of the switch energy storage capacitor can be solved by arranging the third resistor R3, the voltage between the ends of the third resistor R3 can directly supply power to the switch energy storage capacitor, and a direct-current voltage transformation link is not needed; the input voltage of the DC/DC power supply module and the power supply range of the switch energy storage capacitor can be adjusted respectively.
(4) First resistance R1, second resistance R2, third resistance R3 are the series connection mode, and the voltage-sharing resistance that the power supply loop got can the resistance and can do the module simultaneously uses, reduces submodule piece number of components, is favorable to reducing the cost.
The converter valve module has the advantages of simple circuit and good economy, can realize the converter valve module with high reliability, and provides guarantee for the reliable operation of the converter valve.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are for illustrative purposes only of certain embodiments of the present application and are not intended to limit the present application.
FIG. 1 illustrates a converter valve schematic according to an exemplary embodiment of the present application;
fig. 2 shows a supply circuit diagram of a converter valve module according to an exemplary embodiment of the present application;
fig. 3 shows a further embodiment of a supply circuit diagram of a converter valve module according to an example of the present application;
fig. 4 shows a further embodiment of a supply circuit diagram of a converter valve module according to an example of the present application;
fig. 5 shows a further embodiment of a supply loop diagram of a converter valve module according to an example of the present application;
fig. 6 shows a topology of a semiconductor switching cell of a converter valve module according to an exemplary embodiment of the present application;
fig. 7 shows a further embodiment of a topology of a semiconductor switching cell of a converter valve module according to an example of the application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and a repetitive description thereof will be omitted.
The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the embodiments of the disclosure can be practiced without one or more of the specific details, or with other means, components, materials, devices, or the like. In such cases, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail.
The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
It will be appreciated by those skilled in the art that the drawings are merely schematic representations of exemplary embodiments, and that the blocks or processes shown in the drawings are not necessarily required to practice the present application and are, therefore, not intended to limit the scope of the present application.
The application provides a converter valve module and a converter valve, which are used for realizing high-reliability power supply of a submodule control unit and a bypass switch energy storage capacitor of the converter valve module.
Embodiments of the present application will be described below with reference to the accompanying drawings.
Fig. 1 shows a converter valve schematic according to an exemplary embodiment of the present application.
Referring to fig. 1, a converter valve is composed of a plurality of cascaded converter valve modules, and the required voltage is fit and output by controlling the cascaded converter valve modules in the operation process of the converter valve.
According to an exemplary embodiment, each converter valve module comprises two turn-off only semiconductors T1 and T2, a first dc energy storage element C1, a first freewheeling diode D1 and a second freewheeling diode D2, a bypass switch K, wherein the first turn-off semiconductor T1 is connected in anti-parallel with the first freewheeling diode D1, the second turn-off semiconductor T2 is connected in anti-parallel with the second freewheeling diode D2, the first turn-off semiconductor T1, the second turn-off semiconductor T2 form a loop with the first dc energy storage element C1, and the second turn-off semiconductor T2 is connected in parallel with the bypass switch K.
According to an exemplary embodiment, by controlling the on and off of the two turn-off semiconductors T1 and T2, different voltages can be output between the outlet terminals M1 and M2.
According to an example embodiment, when the first turn-off semiconductor T1 is turned on and the second turn-off semiconductor T2 is turned off, the output voltage between M1 and M2 is equal to the voltage of the first dc energy storage element C1.
According to an exemplary embodiment, the output voltage between M1 and M2 when the second turn-off semiconductor T2 is on is equal to the on-state voltage drop of the second turn-off semiconductor T2, which is approximately 0.
According to example embodiments, the turn-off semiconductor device employs an IGBT device.
According to an example embodiment, the energy storage element employs a direct current capacitor; if the converter valve requires a large energy storage, the energy storage element is another element, such as a battery or a super capacitor.
Fig. 2 shows a supply circuit diagram of a converter valve module according to an exemplary embodiment of the present application.
Referring to fig. 2, a power supply circuit of a converter valve module according to an exemplary embodiment of the present disclosure includes a semiconductor switch unit, a first DC energy storage element C1, a bypass switch K, a first resistor R1, a second resistor R2, a third resistor R3, a diode D4, a first power module, a DC/DC power module, a sub-module control unit, and a switch control unit.
As shown in fig. 2, the semiconductor switching unit includes outlet terminals M1 and M2, a positive terminal S1 and a negative terminal S2. A first and a second turn-off semiconductor T1, T2, a first and a second free-wheeling diode D1, D2.
According to an example embodiment, the first turn-off semiconductor T1 is connected in anti-parallel with the first freewheel diode D1 and the second turn-off semiconductor T2 is connected in anti-parallel with the second freewheel diode D2.
According to an exemplary embodiment, the positive pole of the first freewheeling diode D1 is electrically connected to the negative pole of the second freewheeling diode D2, the negative pole of the first freewheeling diode D1 is electrically connected to the positive terminal S1, the positive pole of the second freewheeling diode D2 is electrically connected to the negative terminal S2, the negative pole of the second freewheeling diode D2 is electrically connected to the outgoing terminal M1, and the positive pole of the second freewheeling diode D2 is electrically connected to the outgoing terminal M2.
Referring to fig. 2, the switch control unit includes an energy storage capacitor C _ K and a trigger circuit, the energy storage capacitor C _ K is connected in parallel with the trigger circuit, and the trigger circuit of the switch control unit is connected to the excitation coil of the bypass switch K.
As shown in fig. 2, one end of the first dc energy storage element C1 is electrically connected to the positive terminal S1 of the semiconductor switch unit, and the other end is electrically connected to the negative terminal S2 of the semiconductor switch unit.
As shown in fig. 2, a first resistor R1, a second resistor R2, and a third resistor R3 are connected in series, one end of the first resistor R1 is connected in series with R2, and the other end is connected to one end of a first dc energy storage element C1; one end of the third resistor R3 is connected with the second resistor R2, and the other end of the third resistor R is connected to the other end of the first direct current energy storage element C1; the anode of the diode D3 is connected to the series lead of the first resistor R1 and the second resistor R2, and the cathode of the diode D3 is connected to the DC/DC power supply module; the anode of the diode D4 is connected to the series lead of the second resistor R2 and the third resistor R3; the cathode of the diode D4 is connected to one end of the energy storage capacitor C _ K of the switch control unit.
Referring to fig. 2, the first power module includes incoming terminals X1, X2 and outgoing terminals X3, X4, X5, and X6.
As shown in fig. 2, a line terminal X1 is electrically connected to a positive terminal S1 of the semiconductor switch unit, and a line terminal X2 is electrically connected to a negative terminal S2 of the semiconductor switch unit; the outlet terminals X3 and X4 are connected with the submodule control unit; the outlet terminals X5 and X6 are electrically connected to two ends of the energy storage capacitor C _ K of the switch control unit.
Referring to FIG. 2, the DC/DC power module includes incoming terminals Z1 and Z2 and outgoing terminals Z3 and Z4. And an incoming line terminal Z1 is electrically connected with the cathode of the diode D3, Z2 is electrically connected with the cathode end S2 of the semiconductor switch unit, and outgoing line terminals Z3 and Z4 are connected with the submodule control unit.
Referring to fig. 2, the sub-module control unit includes incoming terminals Y1 and Y2, and outgoing terminals T1 and T2, where the incoming terminals Y1 and Y2 are connected to the DC/DC power module; the submodule control unit is connected with the outlet terminals X3 and X4 of the first voltage module.
According to an example embodiment, during operation of the converter valve, a voltage will be borne across the converter valve, and by controlling the semiconductor switching units T1 and T2 to be turned on or off, a stable dc operating voltage is established across the first dc energy storage element C1, which dc voltage will fluctuate within a certain range, e.g. 500V-3000V, depending on the operation state of the converter valve.
According to an example embodiment, after a dc voltage is established across the first dc energy storage element C1, the incoming terminals X1 and X2 of the first power supply module will establish a voltage, so that the first power supply module starts to operate to provide power to the energy storage capacitors C _ K of the sub-module control unit and the switch control unit.
According to an example embodiment, the first resistor R1, the diode D3, the first DC energy storage element C1 and the DC/DC power supply module form a loop, the first DC energy storage element C1 provides an input for the DC/DC power supply module, and an output of the DC/DC power supply module provides another power supply for the sub-module control unit.
According to an example embodiment, the first dc energy storage element C1, the first resistor R1, the second resistor R2, the diode D4, and the energy storage capacitor C _ K of the switch control unit form a loop, and provide a power supply for the energy storage capacitor C _ K of the switch control unit to charge. Therefore, the energy storage capacitor C _ K of the switch control unit will include two power supplies.
According to an example embodiment, the value of the third resistor R3 satisfies that R3/(R1 + R2+ R3) ≦ 1/5, so that the energy storage capacitor C _ K of the switch control unit is within the allowable operating voltage range.
According to an example embodiment, the first resistor R1, the second resistor R2 are packaged in one housing, and the third resistor R3 is a single housing; or the second resistor R2 and the third resistor R3 are packaged in a shell, and the first resistor R1 is a single shell; or the first resistor R1, the second resistor R2 and the third resistor R3 are packaged in a shell.
According to an example embodiment, the second resistor R2 and the third resistor R3 may be arranged to reduce the operation high voltage of the sub-module to a low voltage.
According to some embodiments, the DC/DC power module converts a wide range of operating voltages to a stable operating voltage required for power supply of the sub-module control unit, which has advantages of low operating voltage, low cost, etc. compared to a method of directly converting power from both ends of the module to power supply of the sub-module control unit.
According to some embodiments, the DC/DC power supply module can be used as a power supply backup power supply for the submodule control unit, so that the power supply reliability of the submodule control unit is improved.
According to an example embodiment, the third resistor R3 can solve the contradiction between the wide-range operating voltage input of the sub-module and the mismatch of the power supply voltage of the energy storage capacitor of the sub-bypass switch, and the voltage between the ends of the third resistor R3 can directly supply power to the energy storage capacitor C _ K without a direct-current voltage conversion link; and the input voltage of the DC/DC power supply module and the power supply range of the switch energy storage capacitor can be respectively adjusted.
According to some embodiments, the first resistor R1, the second resistor R2 and the third resistor R3 are connected in series, and the energy-taking resistor of the power supply loop can be used as a voltage-sharing resistor of the module at the same time, so that the number of sub-module elements is reduced, and the manufacturing cost is reduced.
According to an exemplary embodiment, when a semiconductor switching unit fails, the sub-module control unit sends a control signal to the trigger circuit, and the trigger circuit controls the excitation coil to close the bypass switch K to bypass the failed semiconductor switching unit.
Fig. 3 shows a further embodiment of a supply circuit diagram of a converter valve module according to an example of the application.
Referring to fig. 3, the circuit shown in fig. 3 is substantially the same as the circuit shown in fig. 2, except that: the switch control unit comprises an energy storage capacitor C _ K, an energy storage capacitor C _ K2 and a trigger circuit.
In fig. 2, the outlet terminals X5 and X6 of the first power module are electrically connected to two ends of the energy storage capacitor C _ K of the switch control unit; in fig. 3, the outlet terminals X5 and X6 of the first power module are electrically connected to the trigger circuit of the switch control unit, the energy storage capacitor C _ K is directly connected in parallel with the trigger circuit of the switch control unit, and the energy storage capacitor C _ K2 is electrically connected to the two ends of the outlet terminals X5 and X6 of the first power module. And the power supply loops of the energy storage capacitor C _ K and the energy storage capacitor C _ K2 are mutually independent.
According to an example embodiment, only the energy storage capacitor C _ K is configured in the switch control unit, and the first energy storage capacitor C _ K may be charged by forming a loop by the first dc energy storage element C1, the first resistor R1, the second resistor R2, the diode D4, and the energy storage capacitor C _ K of the switch control unit; the charging can also be carried out through the outlet terminals X5 and X6 of the first power supply module, and the charging loop has higher reliability.
According to an example embodiment, if the energy storage capacitor C _ K is abnormal or fails, the energy storage capacitor C _ K cannot store energy, the trigger circuit of the switch control unit cannot work, and the bypass switch K cannot be switched on when the control converter valve module needs the bypass of the bypass switch to exit from operation.
According to an example embodiment, the addition of the energy storage capacitor C _ K2 will improve the fault tolerance of the trigger circuit of the converter valve module. The energy storage capacitor C _ K is formed by a first resistor R1, a second resistor R2, a diode D4 and the energy storage capacitor C _ K of the switch control unit to form a loop for charging. The energy storage capacitor C _ K2 is charged through the outgoing line terminals X5 and X6 of the first power supply module, and the switching-on action of the bypass switch is not influenced by the fault of any single element.
Fig. 4 shows a further embodiment of a supply circuit diagram of a converter valve module according to an example of the application.
Referring to fig. 4, the circuit shown in fig. 4 is substantially the same as the circuit shown in fig. 2, except that: and a protection thyristor SCR is connected in parallel between the outlet terminals M1 and M2 of the semiconductor switch unit. The negative electrode of the protection thyristor SCR is electrically connected with the outlet terminal M1, and the positive electrode of the protection thyristor SCR is electrically connected with the outlet terminal M2.
According to an example embodiment, the protection thyristor SCR may protect the sub-modules.
Fig. 5 shows a further embodiment of a supply circuit diagram of a converter valve module according to an example of the application.
Referring to fig. 5, the circuit shown in fig. 5 is substantially the same as the circuit shown in fig. 3, except that: a third power supply module is added.
According to an example embodiment, one end of the line inlet end of the third power module is electrically connected to the negative end of the diode D4, the other end of the line inlet end of the third power module is electrically connected to the negative end of the first dc energy storage element C1, and the output end of the third power module is connected to two ends of the energy storage capacitor C _ K.
According to an example embodiment, after the third power module is provided, the value of the third resistor R3 may be set in a wide range, and the requirement that R3/(R1 + R2+ R3) ≦ 1/5 is not required to be satisfied.
Fig. 6 shows a topology of a semiconductor switching cell of a converter valve module according to an exemplary embodiment of the present application.
Referring to fig. 6, the semiconductor switching cells are semiconductor switching cells of a half-bridge structure.
As shown in fig. 6, the semiconductor switching unit includes a first turn-off semiconductor T1, a first freewheel diode D1, a second turn-off semiconductor T2, and a second freewheel diode D2.
According to an example embodiment, the first turn-off semiconductor T1 is connected in anti-parallel with the first freewheeling diode D1, the second turn-off semiconductor T2 is connected in anti-parallel with the second freewheeling diode D2, the first turn-off semiconductor T1 is connected in series with the second turn-off semiconductor T2 in the same direction, and the anode of the first freewheeling diode D1 is electrically connected to the cathode of the second freewheeling diode D2; the negative electrode of the first fly-wheel diode D1 is electrically connected with the positive electrode end S1, and the positive electrode of the second fly-wheel diode D2 is electrically connected with the negative electrode end S2; the cathode of the second freewheeling diode D2 is electrically connected with the outlet terminal M1; the positive electrode of the second freewheeling diode D2 is electrically connected with the outlet terminal M2.
According to an exemplary embodiment, when the semiconductor switch unit is in a half-bridge structure, each converter valve module comprises two semiconductor capable of being turned off, and different voltages can be output between the outlet terminals M1 and M2 by controlling the turning on and off of the two semiconductor capable of being turned off.
According to an example embodiment, when the first semiconductor T1 is turned on and the second semiconductor T2 is turned off, the output voltage between the outlet terminals M1 and M2 is equal to the voltage between the first dc energy storage element C1.
According to an exemplary embodiment, when the second turn-off semiconductor T2 is turned on, the output voltage between the outlet terminals M1 and M2 is equal to the on-state voltage drop of the second turn-off semiconductor T2, which is approximately 0.
According to example embodiments, the turn-off semiconductor device employs an IGBT device.
Fig. 7 shows a further embodiment of a topology of a semiconductor switching cell of a converter valve module according to an example of the application.
Referring to fig. 7, the semiconductor switch unit is a full bridge semiconductor switch unit.
As shown in fig. 7, the semiconductor switching unit includes a first turn-off semiconductor T1, a second turn-off semiconductor T2, a third turn-off semiconductor T3, a fourth turn-off semiconductor T4, a first freewheel diode D1, a second freewheel diode D2, a third freewheel diode D3, and a fourth freewheel diode D4.
According to an example embodiment, the first turn-off semiconductor T1 is connected in anti-parallel with the first freewheeling diode D1, the second turn-off semiconductor T2 is connected in anti-parallel with the second freewheeling diode D2, the first turn-off semiconductor T1 is connected in series with the second turn-off semiconductor T2 in the same direction, and the anode of the first freewheeling diode D1 is electrically connected to the cathode of the second freewheeling diode D2; the third turn-off semiconductor T3 is connected with the third freewheeling diode D3 in an anti-parallel mode, the fourth turn-off semiconductor T4 is connected with the fourth freewheeling diode D4 in an anti-parallel mode, the third turn-off semiconductor T3 is connected with the fourth turn-off semiconductor T4 in series in the same direction, and the anode of the third freewheeling diode D3 is electrically connected with the cathode of the fourth freewheeling diode D4; the negative electrode of the first fly-wheel diode D1 is electrically connected with the negative electrode of the third fly-wheel diode D3, and the positive electrode of the second fly-wheel diode D2 is electrically connected with the positive electrode of the fourth fly-wheel diode D4; the negative electrode of the first fly-wheel diode D1 is electrically connected with the positive electrode end S1, and the negative electrode of the second fly-wheel diode D2 is electrically connected with the negative electrode end S2; the cathode of the second freewheeling diode D2 is electrically connected with the outlet terminal M1; the negative electrode of the fourth freewheeling diode D4 is electrically connected with the outlet terminal M2.
According to an exemplary embodiment, the semiconductor switch units are in a full-bridge structure, each converter valve module comprises four turn-off semiconductors, and different voltages can be output between the outlet terminals M1 and M2 by controlling the turn-on and turn-off of the four turn-off semiconductors.
According to an example embodiment, when the first semiconductor T1 is turned on, the second semiconductor T2 is turned off, the third semiconductor T3 is turned off, and the fourth semiconductor T4 is turned on, the output voltage between the outlet terminals M1 and M2 is equal to the voltage of the first dc energy storage element C1.
According to an exemplary embodiment, when the first turn-off semiconductor T1 is turned off, the second turn-off semiconductor T2 is turned on, the third turn-off semiconductor T3 is turned on, and the fourth turn-off semiconductor T4 is turned off, the output voltage between the outgoing line terminals M1 and M2 is equal to the voltage of the negative first dc energy storage element C1.
According to an exemplary embodiment, when the first turn-off semiconductor T1 is on, the second turn-off semiconductor T2 is off, the third turn-off semiconductor T3 is on, and the fourth turn-off semiconductor T4 is off, the output voltage between the outgoing line terminals M1 and M2 is equal to the on-state voltage drop of the first turn-off semiconductor T1 and the third turn-off semiconductor T3, which is approximately 0.
According to an exemplary embodiment, when the first turn-off semiconductor T1 is turned off, the second turn-off semiconductor T2 is turned on, the third turn-off semiconductor T3 is turned off, and the fourth turn-off semiconductor T4 is turned on, the output voltage between the outlet terminals M1 and M2 is equal to the on-state voltage drop of the second turn-off semiconductor T2 and the fourth turn-off semiconductor T4, which is approximately 0.
According to example embodiments, the turn-off semiconductor device employs an IGBT device.
It should be clearly understood that this application describes how to make and use particular examples, but the application is not limited to any details of these examples. Rather, these principles can be applied to many other embodiments based on the teachings of the present disclosure.
Furthermore, it should be noted that the above-mentioned figures are only schematic illustrations of the processes involved in the method according to exemplary embodiments of the present application and are not intended to be limiting. It will be readily understood that the processes shown in the above figures are not intended to indicate or limit the chronological order of the processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, e.g., in multiple modules.
Exemplary embodiments of the present application are specifically illustrated and described above. It is to be understood that the application is not limited to the details of construction, arrangement, or method of implementation described herein; on the contrary, the intention is to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (18)
1. A converter valve module is characterized by comprising a semiconductor switch unit, a first direct current energy storage element, a bypass switch, a first resistor, a second resistor, a third diode, a fourth diode, a first power module, a DC/DC power module, a sub-module control unit and a switch control unit; wherein:
the semiconductor switch unit comprises a first wire outlet terminal, a second wire outlet terminal, a positive electrode end and a negative electrode end;
the bypass switch is electrically connected with the first outlet terminal and the second outlet terminal;
the switch control unit comprises a first energy storage capacitor and a trigger loop, the first energy storage capacitor is connected with the trigger loop in parallel, and the trigger loop is connected with the bypass switch;
one end of the first direct current energy storage element is electrically connected with the positive electrode end, and the other end of the first direct current energy storage element is electrically connected with the negative electrode end;
after the first resistor, the second resistor and the third resistor are connected in series, one end of the first resistor, the second resistor and the third resistor is electrically connected with the positive end, and the other end of the first resistor, the second resistor and the third resistor is electrically connected with the negative end;
the positive electrode of the third diode is electrically connected with the first resistor and the second resistor series lead, the negative electrode of the third diode is connected to one end of the DC/DC power supply module, and the other end of the DC/DC power supply module is electrically connected with the positive electrode end;
the anode of the fourth diode is electrically connected with the second resistor and the third resistor in series connection with a lead, the cathode of the fourth diode is electrically connected to one end of the first energy storage capacitor, and the other end of the first energy storage capacitor is electrically connected with the cathode end;
the first power supply module is electrically connected with the semiconductor switch unit, the trigger circuit and the sub-module control unit;
the DC/DC power supply module is electrically connected with the sub-module control unit;
the sub-module control unit is connected with the trigger circuit and enables the trigger circuit to work through a trigger signal.
2. Converter valve module according to claim 1, characterized in that the semiconductor switching cells may be in a half-bridge configuration or a full-bridge configuration.
3. Converter valve module according to claim 1, characterized in that the sub-module control unit connection to the triggering circuit can be by electrical or optical connection.
4. The converter valve module of claim 2, wherein the semiconductor switching unit is a half-bridge configuration comprising a first outlet terminal, a second outlet terminal, a positive terminal, a negative terminal, a first turn-off semiconductor, a second turn-off semiconductor, a first freewheeling diode, and a second freewheeling diode, wherein:
the first turn-off semiconductor is connected in anti-parallel with the first freewheeling diode, and the second turn-off semiconductor is connected in anti-parallel with the second freewheeling diode;
the first turn-off semiconductor and the second turn-off semiconductor are connected in series in the same direction;
the anode of the first freewheeling diode is electrically connected with the cathode of the second freewheeling diode;
the negative electrode of the first freewheeling diode is electrically connected with the positive electrode end, the positive electrode of the second freewheeling diode is electrically connected with the negative electrode end, the negative electrode of the second freewheeling diode is electrically connected with the first wire outlet terminal, and the positive electrode of the second freewheeling diode is electrically connected with the second wire outlet terminal.
5. The converter valve module of claim 2, wherein the semiconductor switching unit is a full bridge configuration comprising a first outlet terminal, a second outlet terminal, a positive terminal, a negative terminal, a first turn-off semiconductor, a second turn-off semiconductor, a third turn-off semiconductor, a fourth turn-off semiconductor, a first freewheeling diode, a second freewheeling diode, a third freewheeling diode, and a fourth freewheeling diode, wherein:
the first turn-off semiconductor is connected in anti-parallel with the first freewheeling diode, the second turn-off semiconductor is connected in anti-parallel with the second freewheeling diode, the third turn-off semiconductor is connected in anti-parallel with the third freewheeling diode, and the fourth turn-off semiconductor is connected in anti-parallel with the fourth freewheeling diode;
the first turn-off semiconductor and the second turn-off semiconductor are connected in series in the same direction, the anode of the first free wheel diode is electrically connected with the cathode of the second free wheel diode, the third turn-off semiconductor and the fourth turn-off semiconductor are connected in series in the same direction, and the anode of the third free wheel diode is electrically connected with the cathode of the fourth free wheel diode;
the negative electrode of the first freewheeling diode is electrically connected with the negative electrode of the third freewheeling diode, and the positive electrode of the second freewheeling diode is electrically connected with the positive electrode of the fourth freewheeling diode;
the negative electrode of the first freewheeling diode is electrically connected with the positive electrode end, the second freewheeling diode is electrically connected with the negative electrode end, the negative electrode of the second freewheeling diode is electrically connected with the first wire outlet terminal, and the negative electrode of the fourth freewheeling diode is electrically connected with the second wire outlet terminal.
6. Converter valve module according to claim 2, characterized in that the semiconductor devices of the semiconductor switching cells are IGBT devices.
7. The converter valve module of claim 4, wherein when the semiconductor switching unit is in a half-bridge configuration, different voltages can be output between the outlet terminals by controlling the turn-on and turn-off of the semiconductor, wherein:
when the first semiconductor capable of being turned off is turned on and the second semiconductor capable of being turned off is turned off, the output voltage between the first wire outlet terminal and the second wire outlet terminal is equal to the voltage of the first direct-current energy storage element; or
When the second semiconductor capable of being turned off is turned on, the output voltage between the first wire outlet terminal and the second wire outlet terminal is equal to the on-state voltage drop of the second semiconductor capable of being turned off and is approximately 0.
8. The converter valve module of claim 5, wherein when the semiconductor switch unit is in a full-bridge configuration, different voltages can be output between the outlet terminals by controlling the turn-on and turn-off of the semiconductor switch unit, wherein:
when the first semiconductor capable of being turned off, the second semiconductor capable of being turned off, the third semiconductor capable of being turned on and the fourth semiconductor capable of being turned off are turned off, the output voltage between the first outlet terminal and the second outlet terminal is equal to the voltage of the first direct-current energy storage element, wherein the voltage is negative; or
When the first semiconductor capable of being turned on, the second semiconductor capable of being turned off, the third semiconductor capable of being turned on and the fourth semiconductor capable of being turned off are turned on, the output voltage between the first wire outlet terminal and the second wire outlet terminal is equal to the on-state voltage drop of the first semiconductor capable of being turned off and the third semiconductor capable of being turned off and is approximate to 0; or
When the first semiconductor capable of being turned off, the second semiconductor capable of being turned on, the third semiconductor capable of being turned off and the fourth semiconductor capable of being turned on, the output voltage between the first wire outlet terminal and the second wire outlet terminal is equal to the on-state voltage drop of the second semiconductor capable of being turned off and the fourth semiconductor capable of being turned off, and is approximately 0.
9. The converter valve module of claim 1, wherein the third resistance has a value that is less than or equal to 1/5 of a sum of the first resistance, the second resistance, and the third resistance.
10. The converter valve module of claim 1, wherein:
the first resistor and the second resistor are packaged in a shell, and the third resistor is packaged separately; or
The second resistor and the third resistor are packaged in a shell, and the first resistor is packaged separately; or
The first resistor, the second resistor and the third resistor are packaged in a shell.
11. The converter valve module of claim 1, wherein:
the switch control unit further comprises a second energy storage capacitor;
the second energy storage capacitor is connected with the first power supply module in parallel;
and the power supply loops of the first energy storage capacitor and the second energy storage capacitor are mutually independent.
12. Converter valve module according to claim 1, wherein the energy storage element may be a dc capacitor, a battery or a super capacitor.
13. Converter valve module according to claim 1, wherein said semiconductor switch unit is malfunctioning, said sub-module control unit issues said control signal to said trigger circuit, said trigger circuit controlling said bypass switch to close bypassing said malfunctioning semiconductor switch unit.
14. The converter valve module of claim 1, wherein:
the converter valve module further comprises a protection thyristor;
and the negative electrode of the protective thyristor is electrically connected with the first wire outlet terminal, and the positive electrode of the protective thyristor is electrically connected with the second wire outlet terminal.
15. The converter valve module of claim 1, wherein the first energy storage capacitor is powered by two loops, wherein:
the first energy storage capacitor and the first power supply module are connected in parallel to form a loop for supplying power;
the first energy storage capacitor, the first direct current energy storage element, the first resistor, the second resistor and the fourth diode loop supply power.
16. The converter valve module of claim 1, wherein the sub-module control unit is powered by two loops, wherein:
the DC/DC power supply module and the sub-module control unit are connected in parallel to supply power;
the first power supply module and the sub-module control unit are connected in parallel to form a loop for supplying power.
17. A converter valve, comprising:
comprising several cascaded converter valve modules according to any of the claims 1-16.
18. The converter valve of claim 17, wherein the converter valve is operated by controlling the cascaded converter valve modules to fit and output a desired voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110897789.5A CN115706540A (en) | 2021-08-05 | 2021-08-05 | Converter valve module and converter valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110897789.5A CN115706540A (en) | 2021-08-05 | 2021-08-05 | Converter valve module and converter valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115706540A true CN115706540A (en) | 2023-02-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110897789.5A Pending CN115706540A (en) | 2021-08-05 | 2021-08-05 | Converter valve module and converter valve |
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| Country | Link |
|---|---|
| CN (1) | CN115706540A (en) |
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2021
- 2021-08-05 CN CN202110897789.5A patent/CN115706540A/en active Pending
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