WO2020199880A1 - 模块化多电平换流器带电投入运行的方法及控制系统 - Google Patents

模块化多电平换流器带电投入运行的方法及控制系统 Download PDF

Info

Publication number
WO2020199880A1
WO2020199880A1 PCT/CN2020/078853 CN2020078853W WO2020199880A1 WO 2020199880 A1 WO2020199880 A1 WO 2020199880A1 CN 2020078853 W CN2020078853 W CN 2020078853W WO 2020199880 A1 WO2020199880 A1 WO 2020199880A1
Authority
WO
WIPO (PCT)
Prior art keywords
bridge
sub
switch
full
port
Prior art date
Application number
PCT/CN2020/078853
Other languages
English (en)
French (fr)
Inventor
胡仙来
胡兆庆
董云龙
Original Assignee
南京南瑞继保电气有限公司
南京南瑞继保工程技术有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 南京南瑞继保电气有限公司, 南京南瑞继保工程技术有限公司 filed Critical 南京南瑞继保电气有限公司
Publication of WO2020199880A1 publication Critical patent/WO2020199880A1/zh

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Definitions

  • This application relates to the field of flexible direct current transmission and distribution, and in particular to a method and a control system for a modular multilevel converter to be put into operation on-line.
  • half-voltage operation is transformed into full-voltage operation.
  • half-pressure operating conditions only one valve group is put into operation in one pole, and the other valve group in series with it is bypassed and is not in operation.
  • the bypass valve group needs to be charged in a state where both ends are short-circuited, and finally unlocked and put into the power transmission loop.
  • the algorithm for short-circuit charging of the valve group is often very complicated, and the adaptability to the change of the real-time parameters of the converter is not strong.
  • the valve group input strategy defaults that all sub-modules are in a normal state, and the valve group is charged and even put into operation on this basis.
  • the valve group is charged and even put into operation on this basis.
  • there are a large number of sub-modules and there may be a certain number of abnormalities.
  • the normal sub-modules are still charged, it may cause damage to the sub-modules.
  • the pre-charging detection measures under the open circuit condition are not taken, the direct current
  • the side short-circuit zero module voltage charging method has a complicated charging strategy, and there is a risk of charging failure, and the abnormal sub-module causes the real-time parameter changes of the converter, which in turn affects the accuracy of the valve group short-circuit charging effect.
  • the purpose of this application is to propose a method and system for putting a modular multi-level converter into operation with electricity, so as to solve the problem that the current method of putting the converter into operation cannot judge the abnormality of the sub-module and the short-circuit charging algorithm cannot adapt to the actual converter parameters.
  • the question of change is to propose a method and system for putting a modular multi-level converter into operation with electricity, so as to solve the problem that the current method of putting the converter into operation cannot judge the abnormality of the sub-module and the short-circuit charging algorithm cannot adapt to the actual converter parameters. The question of change.
  • the embodiment of the present application provides a method for the live operation of a modular multilevel converter, wherein the method is based on a device for the modular multilevel converter to be put into operation with electricity, and the device includes a modular multilevel converter.
  • a converter and an additional circuit the additional circuit includes a first DC port and a second DC port, the first DC port is connected in parallel to the DC port of the modular multilevel converter, the module
  • the AC port of the multilevel converter forms the AC port of the device, the AC port is connected to an AC power source through an AC switch, the second DC port forms the DC port of the device, and the additional loop includes a switch,
  • the DC port of the device is equivalent to a short circuit or an open circuit
  • the DC port of the modular multilevel converter is equivalent to a short circuit or an open circuit.
  • the method includes: operating the additional circuit, Make the DC port of the device equivalent to a short circuit, and the DC port of the modular multilevel converter is equivalent to an open circuit; close the AC switch to perform precharging on the modular multilevel converter And detect the abnormality of the sub-modules of the modular multi-level converter; if the sub-module is abnormal, all sub-modules are blocked, the AC switch is turned off, and the abnormal sub-modules are processed until there is no sub-module abnormality; operate the additional Loop, the DC port of the device is equivalent to a short circuit, and the DC port of the modular multi-level converter is equivalent to a short circuit; the charging strategy is performed on the modular multi-level converter until it is put into operation Conditions: Operate the additional circuit and put the modular multilevel converter into the DC operating circuit.
  • the sub-modules of the modular multilevel converter include full-bridge sub-modules and half-bridge sub-modules, or all are full-bridge sub-modules.
  • the additional circuit includes a first branch, a second branch, a third branch, and a fourth branch.
  • the first branch includes a first switch; and the second branch includes a second branch. Switch, one end of the second branch and one end of the first branch are connected to the first terminal;
  • the third branch includes a third switch, one end of the third branch is connected to the second branch The other end of the circuit is connected to the second terminal;
  • the fourth branch includes a fourth switch, one end of the fourth branch and the other end of the third branch are connected to the third terminal, and the fourth branch
  • the other end of the circuit and the other end of the first branch are connected to the fourth terminal;
  • the first terminal and the fourth terminal constitute the first DC port of the additional circuit;
  • the second terminal and the The third terminal constitutes a second DC port of the additional circuit.
  • the switch of the additional circuit includes at least one of an isolating switch, a circuit breaker or a semiconductor switch.
  • the operating the additional loop to make the DC port of the device equivalent to a short circuit, and the DC port of the modular multilevel converter equivalent to an open circuit includes: closing the second The switch and the third switch open the first switch and the fourth switch; or close the third switch and the fourth switch, and open the first switch and the second switch.
  • the operating the additional loop to make the DC port of the device equivalent to a short circuit, and the DC port of the modular multilevel converter equivalent to a short circuit includes: disconnecting the second A switch that closes the second switch, the third switch and the fourth switch; or closes the first switch, the second switch and the fourth switch, and opens the third switch.
  • the half-bridge sub-module includes at least one half-bridge first turn-off device, at least one half-bridge second turn-off device, and an energy storage element.
  • Parallel diodes; the half-bridge second switchable device with anti-parallel diodes, the anode of the half-bridge second switchable device and the cathode of the half-bridge first switchable device are connected to form a half-bridge first bridge ,
  • the anode of the first switch-off device of the half-bridge is used as the anode of the first half-bridge
  • the cathode of the second switch-off device of the half-bridge is used as the cathode of the first half-bridge.
  • connection point of the first switch-off device of the bridge and the second switch-off device of the half-bridge is used as the first end of the half-bridge sub-module, and the negative pole of the first half-bridge is used as the half-bridge sub-module
  • the second terminal of the energy storage element is connected to the positive electrode of the first half-bridge bridge, and the negative electrode of the energy storage element is connected to the negative electrode of the first half-bridge bridge.
  • the execution of a pre-charging strategy for the modular multi-level converter includes: a half-locked full-bridge type sub-module , Lock the half-bridge sub-module; or lock all the sub-modules.
  • the execution of the pre-charging strategy for the modular multi-level converter includes: a half-locked partial full-bridge sub-module, and a partially locked full-bridge sub-module. Bridge sub-module; or half-locked all sub-modules.
  • the semi-locked full-bridge sub-module includes: turning on any one of the full-bridge sub-modules that can be turned off, and turning off other turn-off devices.
  • the locking includes: turning off all the turn-off devices in the sub-module.
  • the full-bridge sub-module includes at least one full-bridge first switchable device, at least one full-bridge second switchable device, at least one full-bridge third switchable device, and at least one full-bridge second switchable device.
  • the first switch-off device of the full bridge has an anti-parallel diode
  • the second switch-off device of the full bridge has an anti-parallel diode
  • the second switch-off device of the full bridge The anode of the first full-bridge switchable device is connected to the cathode of the first full-bridge switchable device to form a full-bridge first bridge.
  • the anode of the first full-bridge switchable device serves as the anode of the first full-bridge switch-off device.
  • the negative electrode is used as the negative electrode of the first full bridge, and the connection point between the first switchable device of the full bridge and the second switchable device of the full bridge is used as the first terminal of the full bridge submodule; the third full bridge can be switched off
  • the device has an anti-parallel diode;
  • the fourth switchable device of the full bridge has an anti-parallel diode, and the anode of the fourth switchable device of the full bridge is connected to the cathode of the third switchable device of the full bridge to form a full bridge Second bridge
  • the anode of the third full-bridge switchable device serves as the anode of the second full-bridge
  • the cathode of the fourth full-bridge switchable device serves as the cathode of the second full-bridge, so
  • the abnormal condition of the sub-module includes: a communication failure of the sub-module or failure bypass.
  • the embodiment of the present application also provides a control system for the live operation of a modular multilevel converter, wherein the control system is based on a device for the modular multilevel converter for live operation, and the device includes a modular A multilevel converter and an additional circuit, the additional circuit includes a first DC port and a second DC port, the first DC port is connected in parallel to the DC port of the modular multilevel converter,
  • the AC port of the modular multilevel converter forms the AC port of the device, the AC port is connected to an AC power source through an AC switch, the second DC port forms the DC port of the device, and the additional loop A switch is included, and the DC port of the device is equivalent to a short circuit or an open circuit through the additional loop, the DC port of the modular multilevel converter is equivalent to a short circuit or an open circuit
  • the control system includes a first operation A control unit, a precharge control module, a second operation control unit, a charging module, and a third operation control unit, the first operation control unit is used to operate the additional circuit to make the DC port of
  • the second operation control unit is used to operate the additional circuit to make the DC of the device
  • the port is equivalent to a short circuit
  • the DC port of the modular multilevel converter is equivalent to a short circuit
  • the charging module is triggered; the charging module is used to execute a charging strategy for the modular multilevel converter, Until the commissioning condition is reached, then the third operation control unit is triggered; the third operation control unit is used to operate the additional circuit and put the modular multilevel converter into the DC operation circuit.
  • the sub-modules of the modular multilevel converter include full-bridge sub-modules and half-bridge sub-modules, or all are full-bridge sub-modules.
  • the technical solution provided by the embodiments of the present application can eliminate the abnormal sub-modules of the modular multi-level converter before the formal charging, and at the same time make the valve group complete the pre-charging before the short-circuit charging is performed, which significantly relieves the algorithmic pressure of the short-circuit charging strategy. Create good conditions for the smooth operation of modular multilevel converters.
  • Fig. 1 is a schematic diagram of the structure of a modular multi-level converter including a full-bridge sub-module and a half-bridge sub-module provided by an embodiment of the present application.
  • Fig. 2 is a schematic diagram of the structure of a full-bridge sub-module provided by an embodiment of the present application.
  • FIG. 3 is a schematic diagram of the structure of a half-bridge sub-module provided by an embodiment of the present application.
  • 4A is a schematic diagram 1 of the structure of a semi-locked full-bridge sub-module provided by an embodiment of the present application.
  • 4B is a second schematic diagram of the structure of a semi-locked full-bridge sub-module provided by an embodiment of the present application.
  • Fig. 5 is a schematic diagram of an additional loop structure provided by an embodiment of the present application.
  • Fig. 6 is a schematic diagram of a device structure for putting a modular multilevel converter into operation according to an embodiment of the present application.
  • FIG. 7A is the first schematic diagram of a device provided by an embodiment of the present application in which the DC terminal is equivalent to a short circuit and the converter DC terminal is equivalent to an open circuit.
  • FIG. 7B is a second schematic diagram of a device provided by an embodiment of the present application where the DC terminal is equivalent to a short circuit and the converter DC terminal is equivalent to an open circuit.
  • FIG. 8A is the first schematic diagram of a device provided by an embodiment of the present application in which the DC terminal is equivalent to a short circuit and the converter DC terminal is equivalent to a short circuit.
  • FIG. 8B is a second schematic diagram of a device provided by an embodiment of the present application where the DC terminal is equivalent to a short circuit, and the converter DC terminal is equivalent to a short circuit.
  • Fig. 9 is a schematic diagram of a multi-level modular inverter provided by an embodiment of the present application after it is put into operation.
  • FIG. 10 is one of the schematic flowcharts of a method for putting a modular multilevel converter into operation according to an embodiment of the present application.
  • FIG. 11 is the second schematic diagram of a method for putting a modular multilevel converter into operation according to an embodiment of the present application.
  • Fig. 12 is a third schematic flowchart of a method for putting a modular multilevel converter into operation according to an embodiment of the present application.
  • FIG. 13 is a fourth flowchart of a method for putting a modular multilevel converter into operation according to an embodiment of the application.
  • Fig. 14 is a fifth schematic flowchart of a method for putting a modular multilevel converter into operation according to an embodiment of the present application.
  • FIG. 15 is a sixth flowchart of a method for putting a modular multilevel converter into operation according to an embodiment of the present application.
  • FIG. 16 is a seventh flowchart of a method for putting a modular multilevel converter into operation according to an embodiment of the present application.
  • Fig. 6 is a schematic diagram of a device structure for putting a modular multilevel converter into operation according to an embodiment of the present application.
  • the device includes a modular multi-level converter and additional circuits.
  • the additional loop includes two ports, namely a first DC port and a second DC port.
  • the first DC port is connected in parallel to the DC port of the modular multilevel converter.
  • the AC port of the modular multilevel converter forms the AC port of the device.
  • the AC port is connected to the AC power supply through an AC switch.
  • the second The DC port forms the DC port of the device.
  • the sub-modules constituting the bridge arm of the modular multilevel converter are partially full-bridge sub-modules FB-SM, and the rest are half-bridge sub-modules HB-SM, as shown in FIG. 1.
  • Terminal A, terminal B and terminal C constitute the AC port of the converter, and terminal P and terminal N constitute the DC port of the converter.
  • the sub-modules constituting the bridge arm of the modular multilevel converter are all full-bridge sub-modules.
  • the full-bridge sub-module includes at least four turn-off devices with anti-parallel diodes and energy storage elements.
  • the full-bridge sub-module is shown in FIG. 2, wherein the first full-bridge switchable device of the full-bridge sub-module is Q1f, the second full-bridge switch-off device is Q2f, and the third full-bridge device is Q2f.
  • the switch-off device is Q3f, and the fourth switch-off device of the full bridge is Q4f.
  • the cathode of the first full-bridge switchable device Q1f is connected to the anode of the second full-bridge switchable device Q2f to form the first full-bridge bridge, and the anode of the first full-bridge switchable device Q1f serves as the anode of the first full-bridge bridge ,
  • the cathode of the second full-bridge switchable device Q2f is used as the cathode of the first full-bridge bridge, and the connection point between the first full-bridge switchable device Q1f and the second full-bridge switchable device Q2f is used as the first full-bridge submodule.
  • the cathode of the third full-bridge switchable device Q3f is connected to the anode of the fourth full-bridge switchable device Q4f to form the second full-bridge bridge, and the anode of the third full-bridge switchable device Q3f serves as the anode of the second full-bridge bridge ,
  • the cathode of the fourth full-bridge switchable device Q4f serves as the cathode of the second full-bridge bridge, and the connection point between the third full-bridge switchable device Q3f and the fourth full-bridge switchable device Q4f serves as the first full-bridge submodule.
  • the positive pole of the first full bridge and the positive pole of the second full bridge are connected to the positive pole of the energy storage element, and the negative pole of the first full bridge and the negative pole of the second full bridge are connected to the negative pole of the energy storage element.
  • the half-bridge sub-module includes at least two turn-off devices with anti-parallel diodes and an energy storage element.
  • the half-bridge sub-module converter is shown in FIG. 3, wherein the first half-bridge switchable device of the half-bridge sub-module is Q1h, and the second half-bridge switchable device is Q2h.
  • the negative pole of the first turn-off device Q1h of the half-bridge is connected to the positive pole of the second turn-off device Q2h of the half-bridge to form the first half-bridge bridge.
  • the anode of the first switch-off device Q1h of the half-bridge is used as the anode of the first bridge of the half-bridge
  • the cathode of the second switch-off device of the half-bridge Q2h is the cathode of the first bridge of the half-bridge
  • the first switch-off device of the half-bridge Q1h and The connection point of the second switchable device Q2h of the half-bridge is used as the first end of the half-bridge sub-module
  • the negative pole of the first half-bridge is used as the second end of the half-bridge sub-module
  • the positive pole of the first half-bridge is connected to the energy storage.
  • the positive pole of the element is connected
  • the negative pole of the first bridge of the half-bridge is connected with the negative pole of the energy storage element.
  • the pre-charging includes two methods. One is the half-blocking full-bridge sub-module and the half-blocking sub-module. The second is to lock all sub-modules.
  • the additional circuit includes a switch, through which the DC port of the device is equivalent to a short circuit or an open circuit, and the DC port of the converter is equivalent to a short circuit or an open circuit.
  • the switch of the additional circuit includes an isolating switch, a circuit breaker or a semiconductor switch, or a combination of the above elements.
  • Fig. 5 is a schematic diagram of an additional loop structure provided by an embodiment of the present application.
  • the additional circuit includes the first branch, the second branch, the third branch, and the fourth branch.
  • the first branch includes the first switch Q1, the second branch includes the second switch Q2, the third branch includes the third switch Q3, and the fourth branch includes the fourth switch Q4.
  • One end of the first branch is connected to one end of the second branch, and the common end is the first terminal n1.
  • the other end of the second branch is connected to one end of the third branch, and the common terminal is the second terminal n2.
  • the other terminal of the third branch is connected to one end of the fourth branch, and the common terminal is the third terminal n3.
  • the other terminal of the fourth branch is connected to the other terminal of the first branch, and the common terminal is the fourth terminal n4.
  • the first terminal n1 and the fourth terminal n4 constitute the first DC port of the additional circuit.
  • the second terminal n2 and the third terminal n3 constitute a second DC port of the additional circuit.
  • the switch of the additional circuit can be an isolating switch, a circuit breaker or a semiconductor switch, or a combination of the above elements.
  • the four switches are all circuit breakers.
  • Fig. 10 is one of the schematic flow diagrams of a method for putting a modular multilevel converter into operation according to an embodiment of the present application. The method is based on a live operation device of the modular multilevel converter.
  • the device includes a modular multilevel converter and an additional circuit.
  • the AC port of the modular multilevel converter forms the AC port of the device, and the AC port is connected to an AC power source through an AC switch (not shown).
  • the sub-modules constituting the bridge arm of the converter are full-bridge sub-modules FB-SM, and the rest are half-bridge sub-modules HB-SM, as shown in Figure 6.
  • the additional circuit is operated to make the DC port of the device equivalent to a short circuit, and the DC port of the modular multilevel converter is equivalent to an open circuit.
  • the locking sub-module is specifically: turning off all the turn-off devices in the sub-module.
  • Abnormal conditions of the sub-module include: communication failure or failure bypass of the sub-module, and other abnormal working conditions, but not limited to this.
  • the additional loop is operated to make the DC port of the device equivalent to a short circuit, and the DC port of the modular multilevel converter is equivalent to a short circuit.
  • different charging strategies may be adopted and different input conditions may be set.
  • the general charging strategy is to operate the switch-off state of the switchable device to gradually charge the sub-module.
  • the general input condition is that "the voltage of the converter sub-module is as close as possible to the rated voltage after unlocking, so as to minimize the impact on the circuit at the moment of unlocking and achieve smooth unlocking.”
  • the degree of "closeness" of different projects varies greatly and is not limited to this.
  • the technical solution provided by this embodiment can eliminate the abnormal sub-modules of the modular multi-level converter before the formal charging, and at the same time make the valve group complete the pre-charging before performing the short-circuit charging, which significantly relieves the algorithmic pressure of the short-circuit charging strategy.
  • the stable operation of modular multilevel converters creates good conditions.
  • FIG. 11 is the second schematic diagram of a method for putting a modular multilevel converter into operation according to an embodiment of the present application.
  • the device includes a modular multilevel converter and an additional circuit.
  • the AC port of the modular multilevel converter forms the AC port of the device, and the AC port is connected to an AC power source through an AC switch (not shown).
  • the sub-modules constituting the bridge arm of the converter are full-bridge sub-modules FB-SM, and the rest are half-bridge sub-modules HB-SM, as shown in Figure 6.
  • step S210 the additional circuit is operated to make the DC port of the device equivalent to a short circuit, and the DC port of the converter to equivalent to an open circuit, as shown in Figs. 7A and 7B.
  • step S220 the AC switch is closed, and the abnormal condition of the sub-module of the modular multi-level converter is detected through the pre-charging method.
  • the AC switch is closed, the full-bridge sub-module is half-locked, and the half-bridge sub-module is locked to precharge the converter.
  • the semi-latching full-bridge sub-module is specifically: turning on any one of the full-bridge sub-modules that can be turned off, and turning off other turn-off devices.
  • the half-locked full-bridge sub-module is shown in Figure 4A and Figure 4B.
  • the first full-bridge switchable device Q1f is turned on, the second full-bridge switchable device Q2f, the third full-bridge switchable device Q3f, and the fourth full-bridge switchable device Q4f are turned off, as shown in FIG. 4A.
  • the second full-bridge switchable device Q4f is turned on, the first full-bridge switchable device Q1f, the third full-bridge switchable device Q2f, and the fourth full-bridge switchable device Q3f are turned off.
  • the third full-bridge switchable device Q4f is turned on, the first full-bridge switchable device Q1f, the second full-bridge switchable device Q2f, and the fourth full-bridge switchable device Q3f are turned off.
  • the blocking of the half-bridge sub-module is specifically: turning off all the turn-off devices in the half-bridge sub-module.
  • Abnormal conditions of the sub-module include: communication failure or failure bypass of the sub-module, and other abnormal working conditions.
  • step S230 if a sub-module abnormality occurs, all sub-modules are blocked, the AC switch is turned off, and the abnormal sub-module is processed until there is no sub-module abnormality.
  • step S240 the additional circuit is operated to make the DC port of the device equivalent to a short circuit, and the DC port of the converter is equivalent to a short circuit, as shown in FIGS. 8A and 8B.
  • the specific operation may be: closing the second switch Q2, the third switch Q3, and the fourth switch Q4, and turning off the first switch Q1, as shown in FIG. 8A. Or close the first switch Q1, the second switch Q2 and the fourth switch Q4, and open the third switch Q3, as shown in FIG. 8B.
  • the DC port of other implementations can also be equivalent to a short circuit, and the DC port of the converter is equivalent to a short circuit operation.
  • step S250 the charging strategy is executed on the converter until the input condition is reached.
  • different charging strategies may be adopted and different input conditions may be set.
  • the general charging strategy is to operate the switch-off state of the switchable device to gradually charge the sub-module.
  • the general input condition is that "the voltage of the converter sub-module is as close as possible to the rated voltage after unlocking, so as to minimize the impact on the circuit at the moment of unlocking and achieve smooth unlocking.”
  • the degree of "closeness" of different projects varies greatly and is not limited to this.
  • step S260 the additional circuit is operated, and the converter is put into the DC operation circuit. After the converter is unlocked, power interaction with the DC system is realized through the terminal P and the terminal N.
  • Fig. 12 is a third schematic flowchart of a method for putting a modular multilevel converter into operation according to an embodiment of the present application.
  • the device includes a modular multilevel converter and an additional circuit.
  • the AC port of the modular multilevel converter forms the AC port of the device, and the AC port is connected to an AC power source through an AC switch (not shown).
  • the sub-modules constituting the bridge arm of the converter are full-bridge sub-modules FB-SM, and the rest are half-bridge sub-modules HB-SM, as shown in Figure 6.
  • step S310 the additional loop is operated to make the DC port of the device equivalent to a short circuit and the DC port of the converter to equivalently be an open circuit.
  • step S320 the AC switch is closed, all sub-modules are blocked, and the converter is precharged.
  • the locking sub-module is specifically: turning off all the turn-off devices in the sub-module.
  • step S330 if a sub-module abnormality occurs, all sub-modules are blocked, the AC switch is turned off, and the abnormal sub-module is processed until there is no sub-module abnormality.
  • Abnormal conditions of the sub-module include: communication failure or failure bypass of the sub-module, and other abnormal working conditions.
  • step S340 the additional circuit is operated to make the DC port of the device equivalent to a short circuit, and the DC port of the converter is equivalent to a short circuit, as shown in FIGS. 8A and 8B.
  • the specific operation may be: closing the second switch Q2, the third switch Q3, and the fourth switch Q4, and turning off the first switch Q1, as shown in FIG. 8A. Or close the first switch Q1, the second switch Q2 and the fourth switch Q4, and open the third switch Q3, as shown in FIG. 8B.
  • the DC port of other implementations can also be equivalent to a short circuit, and the DC port of the converter is equivalent to a short circuit operation.
  • step S350 the charging strategy is executed on the converter until the input conditions are reached.
  • different charging strategies may be adopted and different input conditions may be set.
  • the general charging strategy is to operate the switch-off state of the switchable device to gradually charge the sub-module.
  • the general input condition is that "the voltage of the converter sub-module is as close as possible to the rated voltage after unlocking, so as to minimize the impact on the circuit at the moment of unlocking and achieve smooth unlocking.”
  • the degree of "closeness" of different projects varies greatly and is not limited to this.
  • step S360 the additional circuit is operated to put the converter into the DC running circuit, and after the converter is unlocked, power interaction with the DC system is realized through the terminal P and the terminal N.
  • FIG. 13 is a fourth flowchart of a method for putting a modular multilevel converter into operation according to an embodiment of the application.
  • step S410 the additional loop is operated to make the DC port of the device equivalent to a short circuit and the DC port of the converter to equivalently be an open circuit.
  • step S420 when all the sub-modules constituting the bridge arm of the modular multilevel converter are full-bridge sub-modules, close the AC switch, half-lock some of the full-bridge sub-modules, lock some of the full-bridge sub-modules, and swap The current device is precharged.
  • the semi-latching full-bridge sub-module is specifically: turning on any one of the full-bridge sub-modules that can be turned off, and turning off other turn-off devices.
  • the half-locked full-bridge sub-module is shown in Figure 4A and Figure 4B.
  • the first full-bridge switchable device Q1f is turned on, the second full-bridge switchable device Q2f, the third full-bridge switchable device Q3f, and the fourth full-bridge switchable device Q4f are turned off, as shown in FIG. 4A.
  • the third full-bridge switchable device Q4f is turned on, the first full-bridge switchable device Q1f, the second full-bridge switchable device Q2f, and the fourth full-bridge switchable device Q3f are turned off.
  • Blocking the full-bridge sub-module is specifically: turning off all the turn-off devices in the sub-module.
  • step S430 if a sub-module abnormality occurs, all sub-modules are blocked, the AC switch is turned off, and the abnormal sub-module is processed until there is no sub-module abnormality.
  • Abnormal conditions of the sub-module include: communication failure or failure bypass of the sub-module, and other abnormal working conditions, but not limited to this.
  • step S440 the additional circuit is operated to make the DC port of the device equivalent to a short circuit, and the DC port of the converter is equivalent to a short circuit.
  • step S450 the charging strategy is executed on the converter until the input condition is reached.
  • different charging strategies may be adopted and different input conditions may be set.
  • the general charging strategy is to operate the switch-off state of the switchable device to gradually charge the sub-module.
  • the general input condition is that "the voltage of the converter sub-module is as close as possible to the rated voltage after unlocking, so as to minimize the impact on the circuit at the moment of unlocking and achieve smooth unlocking.”
  • the degree of "closeness" of different projects varies greatly and is not limited to this.
  • step S460 the additional circuit is operated to put the converter into the DC running circuit, and after the converter is unlocked, power interaction with the DC system is realized through the terminal P and the terminal N.
  • Fig. 14 is a fifth schematic flowchart of a method for putting a modular multilevel converter into operation according to an embodiment of the present application.
  • step S510 the additional loop is operated to make the DC port of the device equivalent to a short circuit and the DC port of the converter to equivalently be an open circuit.
  • step S520 the AC switch is closed, all full-bridge sub-modules are half-locked, and the converter is precharged.
  • step S530 if a sub-module abnormality occurs, all full-bridge sub-modules are blocked, the AC switch is turned off, and the abnormal full-bridge sub-module is processed until no full-bridge sub-module is abnormal.
  • step S540 the additional loop is operated to make the DC port of the device equivalent to a short circuit, and the DC port of the converter is equivalent to a short circuit.
  • step S550 the charging strategy is executed on the converter until the input condition is reached.
  • different charging strategies may be adopted and different input conditions may be set.
  • the general charging strategy is to operate the switch-off state of the switchable device to gradually charge the sub-module.
  • the general input condition is that "the voltage of the converter sub-module is as close as possible to the rated voltage after unlocking, so as to minimize the impact on the circuit at the moment of unlocking and achieve smooth unlocking.”
  • the degree of "closeness" of different projects varies greatly and is not limited to this.
  • step S560 the additional circuit is operated, and the converter is put into the DC running circuit. After the converter is unlocked, power interaction with the DC system is realized through terminal P and terminal N.
  • FIG. 15 is a sixth flowchart of a method for putting a modular multilevel converter into operation according to an embodiment of the present application.
  • Fig. 9 is a schematic diagram of a multi-level modular inverter provided by an embodiment of the present application after it is put into operation.
  • the additional circuit is operated to make the DC port of the device equivalent to a short circuit, and the DC port of the converter to equivalent to an open circuit, as shown in Figures 7A and 7B.
  • the AC switch is closed, the converter is precharged, the full-bridge sub-module is half-locked, the first switchable device Q1f of the full bridge is turned on, the second switchable device Q2f of the full bridge is turned off, and the second switchable device of the full bridge is turned off.
  • the third turn-off device Q3f and the fourth full-bridge turn-off device Q4f are shown in FIG. 4A. Or the fourth full-bridge switchable device Q4f is turned on, the first full-bridge switchable device Q1f, the second full-bridge switchable device Q2f, and the third full-bridge switchable device Q3f are turned off. Make it equivalent to a half-bridge sub-module, as shown in Figure 4B. Block the half-bridge sub-module. Detect abnormal conditions of sub-modules.
  • the additional circuit is operated, the second switch Q2, the third switch Q3, and the fourth switch Q4 are closed, and the first switch Q1 is turned off, as shown in FIG. 8A. Or close the first switch Q1, the second switch Q2 and the fourth switch Q4, and open the third switch Q3, as shown in FIG. 8B.
  • the DC port of the device is equivalent to a short circuit, and the DC port of the converter is equivalent to a short circuit.
  • FIG. 16 is a seventh flowchart of a method for putting a modular multilevel converter into operation according to an embodiment of the present application.
  • the additional loop shown in FIG. 9 is operated.
  • the second switch Q2 and the third switch Q3 of the additional loop are closed, and the first switch Q1 and the fourth switch Q4 are turned off, as shown in FIG. 7A. Or close the third switch Q3 and the fourth switch Q4, and open the first switch Q1 and the second switch Q2, as shown in FIG. 7B.
  • the DC port of the device is equivalent to a short circuit, and the DC port of the converter is equivalent to an open circuit.
  • the additional circuit is operated, the second switch Q2, the third switch Q3, and the fourth switch Q4 are closed, and the first switch Q1 is turned off, as shown in FIG. 8A. Or close the first switch Q1, the second switch Q2 and the fourth switch Q4, and open the third switch Q3, as shown in FIG. 8B.
  • the DC port of the device is equivalent to a short circuit, and the DC port of the converter is equivalent to a short circuit.
  • the charging strategy is performed on the converter until the input conditions are reached.
  • different charging strategies may be adopted and different input conditions may be set.
  • the general charging strategy is to operate the switch-off state of the switchable device to gradually charge the sub-module.
  • the general input condition is that "the voltage of the converter sub-module is as close as possible to the rated voltage after unlocking, so as to minimize the impact on the circuit at the moment of unlocking and achieve smooth unlocking.”
  • the degree of "closeness" of different projects varies greatly and is not limited to this.
  • the present application also provides a live operation control system of the modular multilevel converter, which is based on the live operation device of the modular multilevel converter.
  • the device includes a modular multilevel converter and additional circuits.
  • the additional loop includes two ports, a first DC port and a second DC port.
  • the first DC port of the additional loop is connected in parallel to the DC port of the modular multilevel converter.
  • the AC port of the modular multilevel converter forms the AC port of the device, and the second DC port of the additional loop forms the DC port of the device. port.
  • the additional circuit includes a switch, through which the DC port of the device is equivalent to a short circuit or an open circuit, and the DC port of the converter is equivalent to a short circuit or an open circuit.
  • the control system includes a first operation control unit, a precharge control module, a second operation control unit, a charging module, and a third operation control unit.
  • the first operation control unit is used to operate the additional circuit, so that the DC port of the device is equivalent to a short circuit, and the DC port of the modular multilevel converter is equivalent to an open circuit.
  • the pre-charging control module is used to close the AC switch, and detect the abnormal condition of the sub-module through the pre-charging method. If the sub-module is abnormal, all the sub-modules are blocked, the AC switch is disconnected, and the abnormal sub-module is processed. 2. Operation control unit.
  • the second operation control unit is used to operate the additional circuit, so that the DC port of the device is equivalent to a short circuit, and the DC port of the modular multilevel converter is equivalent to a short circuit; then the charging module is triggered.
  • the charging module is used to execute a charging strategy for the modular multi-level converter until the commissioning condition is reached, and then trigger the third operation control unit.
  • the third operation control unit is used to operate the additional circuit and put the modular multilevel converter into the DC operation circuit.
  • some of the sub-modules constituting the bridge arm of the modular multilevel converter are full-bridge sub-modules, and the rest are half-bridge sub-modules, or all are full-bridge sub-modules.
  • the pre-charging includes two methods. One is the half-blocking full-bridge sub-module and the half-blocking sub-module. The second is to lock all sub-modules.
  • pre-charging includes two methods, one is half-locking part of the full-bridge sub-module, and the other is locking part of the full-bridge sub-module; All sub-modules are semi-latched.
  • the semi-latching full-bridge sub-module is specifically: turning on any one of the full-bridge sub-modules that can be turned off, and turning off other turn-off devices.
  • the locking is specifically: turning off all the turn-off devices in the sub-module.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

模块化多电平换流器带电投入运行的方法及控制系统。所述方法基于模块化多电平换流器带电投入运行的装置，包括：操作附加回路，使装置的直流端口等效为短路，模块化多电平换流器的直流端口等效为开路；闭合交流开关，对模块化多电平换流器执行预充电并检测模块化多电平换流器的子模块异常情况；若出现子模块异常，则闭锁全部子模块，断开交流开关，处理异常子模块，直到无子模块异常；操作附加回路，使装置的直流端口等效为短路，模块化多电平换流器的直流端口等效为短路；对模块化多电平换流器执行充电策略，直至达到投入条件；操作附加回路，将模块化多电平换流器投入直流运行回路中。

Description

模块化多电平换流器带电投入运行的方法及控制系统 技术领域
本申请涉及柔性直流输配电领域，具体涉及模块化多电平换流器带电投入运行的方法及控制系统。
背景技术
随着一系列柔性直流应用工程的建设投运，我国柔性直流工程技术向着更高电压等级、更大传输容量、架空线路比例更高的方向发展。为了达到更高直流电压等级，一种可行性很高的解决方案是采用双阀组串联运行，每一极均由两个对称单极换流器串联而成。
对于这样的主电路拓扑，存在一种重要的工况：半压运行变换为全压运行。在半压运行工况下，一个极只有一个阀组投入运行，与之串联另外一个阀组被旁路，不在运行状态。当半压运行变换为全压运行时，旁路阀组需要在两端短路的状态下完成充电，最终解锁并投入功率传输回路中。而阀组短路充电的算法往往非常复杂，且对换流器实时参数的变化适应性不强。
目前工程应用中，阀组投入策略均默认所有子模块为正常状态，在此基础上执行阀组充电乃至投入操作。但子模块数目众多，可能存在一定的异常个数，此时若仍然按照正常子模块来充电，可能导致子模块损坏事故；另外一方面，如果不经过开路情况下预充电检测措施，直接采用直流侧短路零模块电压充电方式，其充电策略比较复杂，有充电失败的风险，且子模块异常导致换流器实时参数变化，反过来影响阀组短路充电效果的准确性。
发明内容
本申请的目的，在于提出模块化多电平换流器带电投入运行的方法及系统，以解决目前换流器投入运行的方法中无法判断子模块异常、短路充电算法不能适应实际换流器参数变化的问题。
本申请实施例提供一种模块化多电平换流器带电投入运行的方法，其中，所述方法基于模块化多电平换流器带电投入运行的装置，所述装置包括模块化多电平换流器和附加回路，所述附加回路包括第一直流端口和第二直流端口，所述第一直流端口并联连接在所述模块化多电平换流器的直流端口，所述模块化多电平换流器的交流端口形成所述装置的交流端口，所述交流端口通过交流开关连接交流电源，所述第二直流端口形成所述装置的直流端口，所述附加回路包括开关，通过所述附加回路实现所述装置的直流端口等效为短路或开路，所述模块化多电平换流器的直流端口等效为短路或开路，所述方法包括：操作所述附加回路，使所述装置的直流端口等效为短路，所述模块化多电平换流器的直流端口等效为开路；闭合所述交流开关，对所述模块化多电平换流器执行预充电并检测所述模块化多电平换流器的子模块异常情况；若出现子模块异常，则闭锁全部子模块，断开交流开关，处理异常子模块，直到无子模块异常；操作所述附加回路，使所述装置的直流端口等效为短路，所述模块化多电平换流器的直流端口等效为短路；对所述模块化多电平换流器执行充电策略，直至达到投入条件；操作所述附加回路，将所述模块化多电平换流器投入直流运行回路中。
根据一些实施例，所述模块化多电平换流器的子模块包括全桥型子模块和半桥型子模块，或者全部为全桥型子模块。
根据一些实施例，所述附加回路包括第一支路、第二支路、第三支路、第四支路，所述第一支路包括第一开关；所述第二支路包括第二开关，所述第二支路的一端与所述第一支路的一端连接于第一端子；所述第三支路包括第三开关，所述第三支路的一端与所述第二支路的另一端连接于第二端子；所述第四支路包括第四开关，所述第四支路的一端与所述第三支路的另一端连接于第三端子，所述第四支路的另一端与所述第一支路的另一端连接于第四端子；所述第一端子与所述第四端子构成所述附加回路的第一直流端口；所述第二端子与所述第三端子构成所述附加回路的第二直流端口。
根据一些实施例，所述的附加回路的开关包括隔离开关、断路器或半导体开关的至少一种。
根据一些实施例，所述操作所述附加回路，使所述装置的直流端口等效为短路，所述模块化多电平换流器的直流端口等效为开路，包括：闭合所述第二开关和所述第三开关，断开所述第一开关和所述第四开关；或者闭合所述第三开关和所述第四开关，断开所述第一开关和所述第二开关。
根据一些实施例，所述操作所述附加回路，使所述装置的直流端口等效为短路，所述模块化多电平换流器的直流端口等效为短路，包括：断开所述第一开关，闭合所述第二开关、所述第三开关和所述第四开关；或者闭合所述第一开关、所述第二开关、所述第四开关，断开所述第三开关。
根据一些实施例，所述半桥子模块包括至少一个半桥第一可关断器件、至少一个半桥第二可关断器件和储能元件，所述半桥第一可关断器件带反并联二极管；所述半桥第二可关断器件带反并联二极管，所述半桥第二可关断器件的正极与所述半桥第一可关断器件的负极连接成半桥第一桥，所述半桥第一可关断器件的正极作为所述半桥第一桥的正极，所述半桥第二可关断器件的负极作为所述半桥第一桥的负极，所述半桥第一可关断器件与所述半桥第二可关断器件的连接点作为所述半桥子模块的第一端点，所述半桥第一桥的负极作为所述半桥子模块的第二端点；所述储能元件的正极与所述半桥第一桥的正极相连，所述储能元件的负极与所述半桥第一桥的负极相连。
根据一些实施例，所述子模块包括全桥型子模块和半桥型子模块时，所述对所述模块化多电平换流器执行预充电策略，包括：半闭锁全桥型子模块，闭锁半桥型子模块；或闭锁全部子模块。
根据一些实施例，所述子模块全部为全桥型子模块时，所述对所述模块化多电平换流器执行预充电策略，包括：半闭锁部分全桥型子模块，闭锁部分全桥型子模块；或半闭锁全部子模块。
根据一些实施例，所述半闭锁全桥型子模块包括：开通全桥型子模块中的任意一个可关断器件，关断其他可关断器件。
根据一些实施例，所述闭锁包括：关断子模块中所有可关断器件。
根据一些实施例，所述全桥子模块包括至少一个全桥第一可关断器件、至少一个全桥第二可关断器件、至少一个全桥第三可关断器件、至少一个全桥第四可关断器件和储能元件，所述全桥第一可关断器件带反并联二极管；所述全桥第二可关断器件带反并联二极管，所述全桥第二可关断器件的正极与所述全桥第一可关断器件的负极连接成全桥第一桥，全桥第一可关断器 件的正极作为全桥第一桥的正极，全桥第二可关断器件的负极作为全桥第一桥的负极，全桥第一可关断器件与全桥第二可关断器件的连接点作为全桥子模块的第一端点；所述全桥第三可关断器件带反并联二极管；所述全桥第四可关断器件带反并联二极管，所述全桥第四可关断器件的正极与所述全桥第三可关断器件的负极连接成全桥第二桥，所述全桥第三可关断器件的正极作为所述全桥第二桥的正极，所述全桥第四可关断器件的负极作为所述全桥第二桥的负极，所述全桥第三可关断器件与所述全桥第四可关断器件的连接点作为所述全桥子模块的第二端点；所述储能元件的正极与所述全桥第一桥的正极、所述全桥第二桥的正极连接，所述储能元件的负极与所述全桥第一桥的负极、所述全桥第二桥的负极相连。
根据一些实施例，所述子模块异常情况包括：子模块出现通讯故障或者出现故障旁路。
本申请实施例还提供一种模块化多电平换流器带电投入运行的控制系统，其中，所述控制系统基于模块化多电平换流器带电投入运行的装置，所述装置包括模块化多电平换流器和附加回路，所述附加回路包括第一直流端口和第二直流端口，所述第一直流端口并联连接在所述模块化多电平换流器的直流端口，所述模块化多电平换流器的交流端口形成所述装置的交流端口，所述交流端口通过交流开关连接交流电源，所述第二直流端口形成所述装置的直流端口，所述附加回路包括开关，通过所述附加回路实现所述装置的直流端口等效为短路或开路，所述模块化多电平换流器的直流端口等效为短路或开路，所述控制系统包括第一操作控制单元、预充电控制模块、第二操作控制单元、充电模块和第三操作控制单元，所述第一操作控制单元用于操作所述附加回路，使所述装置的直流端口等效为短路，所述模块化多电平换流器的直流端口等效为开路；所述预充电控制模块用于闭合所述交流开关，通过预充电方式检测所述子模块异常情况，若出现子模块异常，则闭锁全部子模块，断开交流开关，处理异常子模块，直至无子模块异常，触发第二操作控制单元；所述第二操作控制单元用于操作所述附加回路，使所述装置的直流端口等效为短路，所述模块化多电平换流器的直流端口等效为短路；然后触发充电模块；所述充电模块用于对所述模块化多电平换流器执行充电策略，直至达到投入条件，然后触发第三操作控制单元；所述第三操作控制单元用于操作所述附加回路，将所述模块化多电平换流器投入直流运行回路中。
根据一些实施例，所述模块化多电平换流器的子模块包括全桥型子模块和半桥型子模块，或者全部为全桥型子模块。
本申请实施例提供的技术方案，可以在正式充电之前排除模块化多电平换流器的异常子模块，同时使阀组在执行短路充电之前完成预充电，显著缓解短路充电策略的算法压力，为模块化多电平换流器平稳投入运行创造良好条件。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本申请实施例提供的一种包括全桥型子模块和半桥型子模块的模块化多电平换流器构成示意图。
图2是本申请实施例提供的一种全桥型子模块构成示意图。
图3是本申请实施例提供的一种半桥型子模块构成示意图。
图4A是本申请实施例提供的一种半闭锁全桥型子模块构成示意图一。
图4B是本申请实施例提供的一种半闭锁全桥型子模块构成示意图二。
图5是本申请实施例提供的一种附加回路构成示意图。
图6是本申请实施例提供的一种模块化多电平换流器投入运行的装置构成示意图。
图7A是本申请实施例提供的一种装置直流端等效为短路、换流器直流端等效为开路的示意图一。
图7B是本申请实施例提供的一种装置直流端等效为短路、换流器直流端等效为开路的示意图二。
图8A是本申请实施例提供的一种装置直流端等效为短路、换流器直流端等效为短路的示意图一。
图8B是本申请实施例提供的一种装置直流端等效为短路、换流器直流端等效为短路的示意图二。
图9是本申请实施例提供的一种多电平模块化换流器投入运行后的示意图。
图10是本申请实施例提供的一种模块化多电平换流器投入运行的方法流程示意图之一。
图11是本申请实施例提供的一种模块化多电平换流器投入运行的方法流程示意图之二。
图12是本申请实施例提供的一种模块化多电平换流器投入运行的方法流程示意图之三。
图13是本申请实施例提供的一种模块化多电平换流器投入运行的方法流程示意图之四。
图14是本申请实施例提供的一种模块化多电平换流器投入运行的方法流程示意图之五。
图15是本申请实施例提供的一种模块化多电平换流器投入运行的方法流程示意图之六。
图16是本申请实施例提供的一种模块化多电平换流器投入运行的方法流程示意图之七。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
应当理解，本申请的权利要求、说明书及附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序。本申请的说明书和权利要求书中使用的术语“包括”和“包含”指示所描述特征、整体、步骤、操作、元素和/或组件的存在，但并不排除一个或多个其它特征、整体、步骤、操作、元素、组件和/或其集合的存在或添加。
图6是本申请实施例提供的一种模块化多电平换流器投入运行的装置构成示意图。
如图6所示，装置包括模块化多电平换流器和附加回路。附加回路包括两端口，分别为第一直流端口和第二直流端口。第一直流端口并联在模块化多电平换流器的直流端口，模块化多电平换流器的交流端口形成装置的交流端口，交流端口通过交流开关连接交流电源，附加回路的第二直流端口形成装置的 直流端口。
根据一些实施例，构成模块化多电平换流器桥臂的子模块，部分为全桥型子模块FB-SM、其余为半桥型子模块HB-SM，如图1所示。端子A、端子B和端子C组成换流器的交流端口，端子P和端子N组成换流器的直流端口。
根据一些实施例，构成模块化多电平换流器器桥臂的子模块全部为全桥型子模块。全桥型子模块至少包括四个带反并联二极管的可关断器件和储能元件。
根据一些实施例，全桥型子模块如图2所示，其中，全桥型子模块的全桥第一可关断器件为Q1f，全桥第二可关断器件为Q2f，全桥第三可关断器件为Q3f，全桥第四可关断器件为Q4f。全桥第一可关断器件Q1f的负极与全桥第二可关断器件Q2f的正极相连构成全桥第一桥，全桥第一可关断器件Q1f的正极作为全桥第一桥的正极，全桥第二可关断器件Q2f的负极作为全桥第一桥的负极，全桥第一可关断器件Q1f与全桥第二可关断器件Q2f的连接点作为全桥子模块的第一端点。全桥第三可关断器件Q3f的负极与全桥第四可关断器件Q4f的正极相连构成全桥第二桥，全桥第三可关断器件Q3f的正极作为全桥第二桥的正极，全桥第四可关断器件Q4f的负极作为全桥第二桥的负极，全桥第三可关断器件Q3f与全桥第四可关断器件Q4f的连接点作为全桥子模块的第二端点。全桥第一桥的正极、全桥第二桥的正极与储能元件的正极相连，全桥第一桥的负极、全桥第二桥的负极与储能元件的负极相连。
半桥子模块至少包括两个带反并联二极管的可关断器件和一个储能元件。
根据一些实施例，半桥型子模块换流器如图3所示，其中，半桥型子模块的半桥第一可关断器件为Q1h，半桥第二可关断器件为Q2h。半桥第一可关断器件Q1h的负极与半桥第二可关断器件Q2h的正极相连构成半桥第一桥。半桥第一可关断器件Q1h的正极作为半桥第一桥的正极，半桥第二可关断器件Q2h的负极作为半桥第一桥的负极，半桥第一可关断器件Q1h与半桥第二可关断器件Q2h的连接点作为半桥子模块的第一端点，半桥第一桥的负极作为半桥子模块的第二端点，半桥第一桥的正极与储能元件的正极相连，半桥第一桥的负极与储能元件的负极相连。
当构成换流器桥臂的子模块部分为全桥型子模块、其余为半桥型子模块时，所述预充电包含两种方式。其一是半闭锁全桥子模块，闭锁半桥子模块。其二是闭锁全部子模块。
附加回路包括开关，通过附加回路实现装置的直流端口等效为短路或者开路，换流器的直流端口等效为短路或者开路。附加回路的开关包括隔离开关、断路器或半导体开关，或者为以上元件的组合。
图5是本申请实施例提供的一种附加回路构成示意图。附加回路包含第一支路、第二支路、第三支路和第四支路。
第一支路包含第一开关Q1，第二支路包含第二开关Q2，第三支路包含第三开关Q3，第四支路包含第四开关Q4。第一支路的一端与第二支路的一端相连，公共端为第一端子n1。第二支路的另一端与第三支路的一端相连，公共端子为第二端子n2。第三支路的另一端子与第四支路的一端相连，公共端子为第三端子n3。第四支路的另一端子与第一支路的另一端子相连，公共端子为第四端子n4。第一端子n1与第四端子n4构成附加回路的第一直流端口。第二端子n2与第三端子n3构成附加回路的第二直流端口。附加回路的开关可以为隔离开关、断路器或半导体开关，或者为以上元件的组合。本实施例中，四个开关均采用断路器。
图10是本申请实施例提供的一种模块化多电平换流器投入运行的方法流程示意图之一，所 述方法基于模块化多电平换流器带电投入运行装置。
本实施例中，装置包括模块化多电平换流器和附加回路。模块化多电平换流器的交流端口形成装置的交流端口，交流端口通过交流开关(未示出)连接交流电源。构成换流器桥臂的子模块部分为全桥型子模块FB-SM、其余为半桥型子模块HB-SM，如图6所示。
在S110中，操作附加回路，使装置的直流端口等效为短路，模块化多电平换流器的直流端口等效为开路。
在S120中，闭合交流开关，通过预充电方式检测模块化多电平换流器的子模块异常情况。
在S130中，若出现子模块异常，则闭锁全部子模块，断开交流开关，处理异常子模块，直到再无子模块异常。
闭锁子模块具体为：关断子模块中所有可关断器件。
子模块异常情况包括：子模块出现通讯故障或者出现故障旁路，及其他非正常工作状态，但并不以此为限。
在S140中，操作附加回路，使装置的直流端口等效为短路，模块化多电平换流器的直流端口等效为短路。
在S150中，对换流器执行充电策略，直至达到投入条件。
根据一些实施例，可能采用不同的充电策略，设定不同的投入条件。一般的充电策略是操作所述可关断器件的开合状态，使所述子模块逐渐充电。一般的投入条件是“换流器子模块电压尽可能接近解锁后的额定电压，以使得解锁瞬间对电路的冲击最小，实现平滑解锁”。但不同的工程的“接近”程度有大有小，并不以此为限。
在S160中，操作附加回路，将模块化多电平换流器投入直流运行回路中，换流器解锁后通过端子P和端子N与直流系统实现功率交互。
本实施例提供的技术方案，可以在正式充电之前排除模块化多电平换流器的异常子模块，同时使阀组在执行短路充电之前完成预充电，显著缓解短路充电策略的算法压力，为模块化多电平换流器平稳投入运行创造良好条件。
图11是本申请实施例提供的一种模块化多电平换流器投入运行的方法流程示意图之二。
本实施例中，装置包括模块化多电平换流器和附加回路。模块化多电平换流器的交流端口形成装置的交流端口，交流端口通过交流开关(未示出)连接交流电源。构成换流器桥臂的子模块部分为全桥型子模块FB-SM、其余为半桥型子模块HB-SM，如图6所示。
在步骤S210中，操作附加回路，使装置的直流端口等效为短路，换流器的直流端口等效为开路，如图7A、7B所示。
操作附加回路，使装置的直流端口等效为短路，换流器的直流端口等效为开路。合上附加回路的第二开关Q2和第三开关Q3，断开第一开关Q1和第四开关Q4，如图7A所示。或者合上第三开关Q3和第四开关Q4，断开第一开关Q1和第二开关Q2，如图7B所示。
也可以为其它实现装置的直流端口等效为短路、换流器的直流端口等效为开路的操作。
在步骤S220中，闭合交流开关，通过预充电方式检测模块化多电平换流器的子模块异常情况。
在本实施例中，闭合交流开关，半闭锁全桥子模块，闭锁半桥子模块，对换流器预充电。
半闭锁全桥子模块具体为：开通全桥子模块中的任意一个可关断器件，关断其他可关断器件。半闭锁全桥子模块如图4A、图4B所示。
导通全桥第一可关断器件Q1f，关断全桥第二可关断器件Q2f、全桥第三可关断器件Q3f、全桥第四可关断器件Q4f，如图4A所示。
或者导通全桥第四可关断器件Q4f，关断全桥第一可关断器件Q1f、全桥第二可关断器件Q2f、全桥第三可关断器件Q3f，如图4B所示。
或者导通全桥第二可关断器件Q4f，关断全桥第一可关断器件Q1f、全桥第三可关断器件Q2f、全桥第四可关断器件Q3f。
或者导通全桥第三可关断器件Q4f，关断全桥第一可关断器件Q1f、全桥第二可关断器件Q2f、全桥第四可关断器件Q3f。
闭锁半桥子模块具体为：关断半桥子模块中所有可关断器件。
子模块异常情况包括：子模块出现通讯故障或者出现故障旁路，及其他非正常工作状态。
在步骤S230中，若出现子模块异常，则闭锁全部子模块，断开交流开关，处理异常子模块，直到无子模块异常。
在步骤S240中，操作附加回路，使装置的直流端口等效为短路，换流器的直流端口等效为短路，如图8A、8B所示。
具体操作可以为：合上第二开关Q2、第三开关Q3和第四开关Q4，断开第一开关Q1，如图8A所示。或者合上第一开关Q1、第二开关Q2和第四开关Q4，断开第三开关Q3，如图8B所示。
也可以为其它实现置的直流端口等效为短路，换流器的直流端口等效为短路的操作。
在步骤S250中，对换流器执行充电策略，直至达到投入条件。
根据一些实施例，可能采用不同的充电策略，设定不同的投入条件。一般的充电策略是操作所述可关断器件的开合状态，使所述子模块逐渐充电。一般的投入条件是“换流器子模块电压尽可能接近解锁后的额定电压，以使得解锁瞬间对电路的冲击最小，实现平滑解锁”。但不同的工程的“接近”程度有大有小，并不以此为限。
在步骤S260中，操作附加回路，将换流器投入直流运行回路中，换流器解锁后通过端子P和端子N与直流系统实现功率交互。
图12是本申请实施例提供的一种模块化多电平换流器投入运行的方法流程示意图之三。
本实施例中，装置包括模块化多电平换流器和附加回路。模块化多电平换流器的交流端口形成装置的交流端口，交流端口通过交流开关(未示出)连接交流电源。构成换流器桥臂的子模块部分为全桥型子模块FB-SM、其余为半桥型子模块HB-SM，如图6所示。
在步骤S310中，操作附加回路，使装置的直流端口等效为短路，换流器的直流端口等效为开路。
操作附加回路，合上附加回路的第二开关Q2和第三开关Q3，断开第一开关Q1和第四开关Q4，如图7A所示。或者合上第三开关Q3和第四开关Q4，断开第一开关Q1和第二开关Q2,如图7B所示。使装置的直流端口等效为短路，换流器的直流端口等效为开路。
也可以为其它实现装置的直流端口等效为短路、换流器的直流端口等效为开路的操作。
在步骤S320中，闭合交流开关，闭锁全部子模块，对换流器预充电。
闭锁子模块具体为：关断子模块中所有可关断器件。
在步骤S330中，若出现子模块异常，则闭锁全部子模块，断开交流开关，处理异常子模块，直到无子模块异常。
子模块异常情况包括：子模块出现通讯故障或者出现故障旁路，及其他非正常工作状态。
在步骤S340中，操作附加回路，使装置的直流端口等效为短路，换流器的直流端口等效为短路，如图8A、8B所示。
具体操作可以为：合上第二开关Q2、第三开关Q3和第四开关Q4，断开第一开关Q1，如图8A所示。或者合上第一开关Q1、第二开关Q2和第四开关Q4，断开第三开关Q3，如图8B所示。
也可以为其它实现置的直流端口等效为短路，换流器的直流端口等效为短路的操作。
在步骤S350中，对换流器执行充电策略，直至达到投入条件。
根据一些实施例，可能采用不同的充电策略，设定不同的投入条件。一般的充电策略是操作所述可关断器件的开合状态，使所述子模块逐渐充电。一般的投入条件是“换流器子模块电压尽可能接近解锁后的额定电压，以使得解锁瞬间对电路的冲击最小，实现平滑解锁”。但不同的工程的“接近”程度有大有小，并不以此为限。
在步骤S360中，操作附加回路，将换流器投入直流运行回路中，换流器解锁后通过端子P和端子N与直流系统实现功率交互。
图13是本申请实施例提供的一种模块化多电平换流器投入运行的方法流程示意图之四。
在本实施例中，构成模块化多电平换流器桥臂的子模块全部为全桥型子模块时。
在步骤S410中，操作附加回路，使装置的直流端口等效为短路，换流器的直流端口等效为开路。
在步骤S420中，当构成模块化多电平换流器桥臂的子模块全部为全桥型子模块时，闭合交流开关，半闭锁部分全桥子模块，闭锁部分全桥子模块，对换流器预充电。
半闭锁全桥子模块具体为：开通全桥子模块中的任意一个可关断器件，关断其他可关断器件。
半闭锁全桥子模块如图4A、图4B所示。
导通全桥第一可关断器件Q1f，关断全桥第二可关断器件Q2f、全桥第三可关断器件Q3f、全桥第四可关断器件Q4f，如图4A所示。
或者导通全桥第四可关断器件Q4f，关断全桥第一可关断器件Q1f、全桥第二可关断器件Q2f、全桥第三可关断器件Q3f，如图4B所示。
或者导通全桥第二可关断器件Q4f，关断全桥第一可关断器件Q1f、全桥第三可关断器件Q2f、全 桥第四可关断器件Q3f。
或者导通全桥第三可关断器件Q4f，关断全桥第一可关断器件Q1f、全桥第二可关断器件Q2f、全桥第四可关断器件Q3f。
闭锁全桥子模块具体为：关断子模块中所有可关断器件。
在步骤S430中，若出现子模块异常，则闭锁全部子模块，断开交流开关，处理异常子模块，直到无子模块异常。
子模块异常情况包括：子模块出现通讯故障或者出现故障旁路，及其他非正常工作状态，但并不以此为限。
在步骤S440中，操作附加回路，使装置的直流端口等效为短路，换流器的直流端口等效为短路。
在步骤S450中，对换流器执行充电策略，直至达到投入条件。
根据一些实施例，可能采用不同的充电策略，设定不同的投入条件。一般的充电策略是操作所述可关断器件的开合状态，使所述子模块逐渐充电。一般的投入条件是“换流器子模块电压尽可能接近解锁后的额定电压，以使得解锁瞬间对电路的冲击最小，实现平滑解锁”。但不同的工程的“接近”程度有大有小，并不以此为限。
在步骤S460中，操作附加回路，将换流器投入直流运行回路中，换流器解锁后通过端子P和端子N与直流系统实现功率交互。
图14是本申请实施例提供的一种模块化多电平换流器投入运行的方法流程示意图之五。
在本实施例中，构成模块化多电平换流器桥臂的子模块全部为全桥型子模块时。
在步骤S510中，操作附加回路，使装置的直流端口等效为短路，换流器的直流端口等效为开路。
在步骤S520中，闭合交流开关，半闭锁全部全桥子模块，对换流器预充电。
在步骤S530中，若出现子模块异常，则闭锁全部全桥子模块，断开交流开关，处理异常全桥子模块，直到无全桥子模块异常。
在步骤S540中，操作附加回路，使装置的直流端口等效为短路，换流器的直流端口等效为短路。
在步骤S550中，对换流器执行充电策略，直至达到投入条件。
根据一些实施例，可能采用不同的充电策略，设定不同的投入条件。一般的充电策略是操作所述可关断器件的开合状态，使所述子模块逐渐充电。一般的投入条件是“换流器子模块电压尽可能接近解锁后的额定电压，以使得解锁瞬间对电路的冲击最小，实现平滑解锁”。但不同的工程的“接近”程度有大有小，并不以此为限。
在步骤S560中，操作附加回路，将换流器投入直流运行回路中，换流器解锁后通过端子P和端子N与直流系统实现功率交互。
图15是本申请实施例提供的一种模块化多电平换流器投入运行的方法流程示意图之六。图9是本申请实施例提供的一种多电平模块化换流器投入运行后的示意图。
在S610中，操作附加回路，使装置的直流端口等效为短路，换流器的直流端口等效为开路，如图7A、7B所示。
操作如图9中的附加回路。合上附加回路的第二开关Q2和第三开关Q3，断开第一开关Q1和第四开关Q4，如图7A所示。或者合上第三开关Q3和第四开关Q4，断开第一开关Q1和第二开关Q2，使装置的直流端口等效为短路，换流器的直流端口等效为开路,如图7B所示。
在S620中，闭合交流开关，对换流器进行预充电，半闭锁全桥子模块，导通全桥第一可关断器件Q1f，关断全桥第二可关断器件Q2f、全桥第三可关断器件Q3f、全桥第四可关断器件Q4f，如图4A所示。或者导通全桥第四可关断器件Q4f，关断全桥第一可关断器件Q1f、全桥第二可关断器件Q2f、全桥第三可关断器件Q3f。使之等效为半桥子模块，如图4B所示。闭锁半桥子模块。检测子模块异常情况。
在S630中，若出现子模块异常，则闭锁全部子模块，断开交流开关，处理异常子模块。再次执行S620、S630,直到无子模块异常。
在S640中，操作附加回路，合上第二开关Q2、第三开关Q3和第四开关Q4，断开第一开关Q1，如图8A所示。或者合上第一开关Q1、第二开关Q2和第四开关Q4，断开第三开关Q3，如图8B所示。使装置的直流端口等效为短路，换流器的直流端口等效为短路。
在S650中，对换流器执行充电策略，直至达到投入条件。
在S660中，操作附加回路，合上第二开关Q2和第四开关Q4，断开第一开关Q1和第三开关Q3，将换流器投入直流运行回路中，如图9所示。
图16是本申请实施例提供的一种模块化多电平换流器投入运行的方法流程示意图之七。
在S710中，操作如图9中的附加回路。合上附加回路的第二开关Q2和第三开关Q3，断开第一开关Q1和第四开关Q4，如图7A所示。或者合上第三开关Q3和第四开关Q4，断开第一开关Q1和第二开关Q2，如图7B所示。使装置的直流端口等效为短路，换流器的直流端口等效为开路。
在S720中，闭合交流开关，对换流器进行预充电,闭锁全桥子模块和半桥子模块。
在S730中，若出现子模块异常，则闭锁全部子模块，断开交流开关，处理异常子模块。再次执行S720、S730,直到无子模块异常。
在S740中，操作附加回路，合上第二开关Q2、第三开关Q3和第四开关Q4，断开第一开关Q1，如图8A所示。或者合上第一开关Q1、第二开关Q2和第四开关Q4，断开第三开关Q3，如图8B所示。使装置的直流端口等效为短路，换流器的直流端口等效为短路。
在S750中，对换流器执行充电策略，直至达到投入条件。
根据一些实施例，可能采用不同的充电策略，设定不同的投入条件。一般的充电策略是操作所述可关断器件的开合状态，使所述子模块逐渐充电。一般的投入条件是“换流器子模块电压尽可能接近解锁后的额定电压，以使得解锁瞬间对电路的冲击最小，实现平滑解锁”。但不同的工程的“接近”程度有大有小，并不以此为限。
在S760中，操作附加回路，合上第二开关Q2和第四开关Q4，断开第一开关Q1和第三开关Q3，将换流器投入直流运行回路中，如图9所示。
本申请的多个实施例在附加回路操作的配合下引入预充电阶段，在这一阶段同时完成子模块异常检查和换流阀的初步充电，使换流阀在短路充电前达到一定的荷电量，缓解换流阀短路充电的压力，提高充电成功率。
本申请还提供了一种模块化多电平换流器带电投入运行控制系统，所述控制系统基于模块化多电平换流器带电投入运行装置。
装置包括模块化多电平换流器和附加回路。附加回路包括两端口分别为第一直流端口和第二直流端口。附加回路的第一直流端口并联在模块化多电平换流器的直流端口，模块化多电平换流器的交流端口形成装置的交流端口，附加回路的第二直流端口形成装置的直流端口。附加回路包括开关，通过附加回路实现装置的直流端口等效为短路或者开路，换流器的直流端口等效为短路或者开路。
控制系统包括第一操作控制单元、预充电控制模块、第二操作控制单元、充电模块、第三操作控制单元。
第一操作控制单元用于操作所述附加回路，使装置的直流端口等效为短路，模块化多电平换流器的直流端口等效为开路。
预充电控制模块用于闭合交流开关，通过预充电方式检测子模块异常情况，若出现子模块异常，则闭锁全部子模块，断开交流开关，处理异常子模块，直至无子模块异常，触发第二操作控制单元。
第二操作控制单元用于操作附加回路，使装置的直流端口等效为短路，模块化多电平换流器的直流端口等效为短路；然后触发充电模块。充电模块用于对模块化多电平换流器执行充电策略，直至达到投入条件，然后触发第三操作控制单元。
第三操作控制单元用于操作附加回路，将模块化多电平换流器投入直流运行回路中。
优选的方案中，构成模块化多电平换流器桥臂的子模块，部分为全桥型子模块、其余为半桥型子模块，或者是全部为全桥型子模块。
优选的方案中，构成模块化多电平换流器桥臂的子模块，部分为全桥型子模块、其余为半桥型子模块时，所述预充电包含两种方式。其一是半闭锁全桥子模块，闭锁半桥子模块。其二是闭锁全部子模块。
构成模块化多电平换流器桥臂的子模块全部为全桥型子模块时，预充电包含两种方式，其一是半闭锁部分全桥子模块，闭锁部分全桥子模块；其二是半闭锁全部子模块。
优选的方案中，半闭锁全桥子模块具体为：开通全桥子模块中的任意一个可关断器件，关断其他可关断器件。
优选的方案中，闭锁具体为：关断子模块中所有可关断器件。
以上对本申请实施例进行了详细介绍，本文中应用了具体个例对本申请的原理及实施方式进行了阐述，以上实施例的说明仅用于帮助理解本申请的方法及其核心思想。同时，本领域技术人员依据本申请的思想，基于本申请的具体实施方式及应用范围上做出的改变或变形之处，都属于本申请保护的范围。综上所述，本说明书内容不应理解为对本申请的限制。

Claims (15)

  1. 一种模块化多电平换流器带电投入运行的方法，其中，所述方法基于模块化多电平换流器带电投入运行的装置，所述装置包括模块化多电平换流器和附加回路，所述附加回路包括第一直流端口和第二直流端口，所述第一直流端口并联连接在所述模块化多电平换流器的直流端口，所述模块化多电平换流器的交流端口形成所述装置的交流端口，所述交流端口通过交流开关连接交流电源，所述第二直流端口形成所述装置的直流端口，所述附加回路包括开关，通过所述附加回路实现所述装置的直流端口等效为短路或开路，所述模块化多电平换流器的直流端口等效为短路或开路，所述方法包括：
    操作所述附加回路，使所述装置的直流端口等效为短路，所述模块化多电平换流器的直流端口等效为开路；
    闭合所述交流开关，对所述模块化多电平换流器执行预充电并检测所述模块化多电平换流器的子模块异常情况；
    若出现子模块异常，则闭锁全部子模块，断开交流开关，处理异常子模块，直到无子模块异常；
    操作所述附加回路，使所述装置的直流端口等效为短路，所述模块化多电平换流器的直流端口等效为短路；
    对所述模块化多电平换流器执行充电策略，直至达到投入条件；
    操作所述附加回路，将所述模块化多电平换流器投入直流运行回路中。
  2. 根据权利要求1所述的方法，其中，所述模块化多电平换流器的子模块包括全桥型子模块和半桥型子模块，或者全部为全桥型子模块。
  3. 根据权利要求1所述的方法，其中，所述附加回路包括：
    第一支路，包括第一开关；
    第二支路，包括第二开关，所述第二支路的一端与所述第一支路的一端连接于第一端子；
    第三支路，包括第三开关，所述第三支路的一端与所述第二支路的另一端连接于第二端子；
    第四支路，包括第四开关，所述第四支路的一端与所述第三支路的另一端连接于第三端子，所述第四支路的另一端与所述第一支路的另一端连接于第四端子；
    所述第一端子与所述第四端子构成所述附加回路的第一直流端口；所述第二端子与所述第三端子构成所述附加回路的第二直流端口。
  4. 根据权利要求1至3任一项所述的方法，其中，所述的附加回路的开关包括隔离开关、断路器或半导体开关的至少一种。
  5. 根据权利要求3所述的方法，其中，所述操作所述附加回路，使所述装置的直流端口等效为短路，所述模块化多电平换流器的直流端口等效为开路，包括：
    闭合所述第二开关和所述第三开关，断开所述第一开关和所述第四开关；或者
    闭合所述第三开关和所述第四开关，断开所述第一开关和所述第二开关。
  6. 根据权利要求3所述的方法，其中，所述操作所述附加回路，使所述装置的直流端口等效为短路，所述模块化多电平换流器的直流端口等效为短路，包括：
    断开所述第一开关，闭合所述第二开关、所述第三开关和所述第四开关；或者
    闭合所述第一开关、所述第二开关、所述第四开关，断开所述第三开关。
  7. 根据权利要求2所述的方法，其中，所述半桥子模块包括：
    至少一个半桥第一可关断器件，带反并联二极管；
    至少一个半桥第二可关断器件，带反并联二极管，所述半桥第二可关断器件的正极与所述半桥第一可关断器件的负极连接成半桥第一桥，所述半桥第一可关断器件的正极作为所述半桥第一桥的正极，所述半桥第二可关断器件的负极作为所述半桥第一桥的负极，所述半桥第一可关断器件与所述半桥第二可关断器件的连接点作为所述半桥子模块的第一端点，所述半桥第一桥的负极作为所述半桥子模块的第二端点；
    一个储能元件，所述储能元件的正极与所述半桥第一桥的正极相连，所述储能元件的负极与所述半桥第一桥的负极相连。
  8. 根据权利要求2所述的方法，其中，所述子模块包括全桥型子模块和半桥型子模块时，所述对所述模块化多电平换流器执行预充电策略，包括：
    半闭锁全桥型子模块，闭锁半桥型子模块；或
    闭锁全部子模块。
  9. 根据权利要求2所述的方法，其中，所述子模块全部为全桥型子模块时，所述对所述模块化多电平换流器执行预充电策略，包括：
    半闭锁部分全桥型子模块，闭锁部分全桥型子模块；或
    半闭锁全部子模块。
  10. 根据权利要求8或9所述的方法，其中，所述半闭锁全桥型子模块包括：
    开通全桥型子模块中的任意一个可关断器件，关断其他可关断器件。
  11. 根据权利要求8或9所述的方法，其中，所述闭锁包括：关断子模块中所有可关断器件。
  12. 根据权利要求2所述的方法，其中，所述全桥子模块包括：
    至少一个全桥第一可关断器件，带反并联二极管；
    至少一个全桥第二可关断器件，带反并联二极管，所述全桥第二可关断器件的正极与所述全桥第一可关断器件的负极连接成全桥第一桥，全桥第一可关断器件的正极作为全桥第一桥的 正极，全桥第二可关断器件的负极作为全桥第一桥的负极，全桥第一可关断器件与全桥第二可关断器件的连接点作为全桥子模块的第一端点；
    至少一个全桥第三可关断器件，带反并联二极管；
    至少一个全桥第四可关断器件，带反并联二极管，所述全桥第四可关断器件的正极与所述全桥第三可关断器件的负极连接成全桥第二桥，所述全桥第三可关断器件的正极作为所述全桥第二桥的正极，所述全桥第四可关断器件的负极作为所述全桥第二桥的负极，所述全桥第三可关断器件与所述全桥第四可关断器件的连接点作为所述全桥子模块的第二端点；
    储能元件，所述储能元件的正极与所述全桥第一桥的正极、所述全桥第二桥的正极连接，所述储能元件的负极与所述全桥第一桥的负极、所述全桥第二桥的负极相连。
  13. 根据权利要求1所述的方法，其中，所述子模块异常情况包括：子模块出现通讯故障或者出现故障旁路。
  14. 一种模块化多电平换流器带电投入运行的控制系统，其中，所述控制系统基于模块化多电平换流器带电投入运行的装置，所述装置包括模块化多电平换流器和附加回路，所述附加回路包括第一直流端口和第二直流端口，所述第一直流端口并联连接在所述模块化多电平换流器的直流端口，所述模块化多电平换流器的交流端口形成所述装置的交流端口，所述交流端口通过交流开关连接交流电源，所述第二直流端口形成所述装置的直流端口，所述附加回路包括开关，通过所述附加回路实现所述装置的直流端口等效为短路或开路，所述模块化多电平换流器的直流端口等效为短路或开路，所述控制系统包括：
    第一操作控制单元，用于操作所述附加回路，使所述装置的直流端口等效为短路，所述模块化多电平换流器的直流端口等效为开路；
    预充电控制模块，用于闭合所述交流开关，通过预充电方式检测所述子模块异常情况，若出现子模块异常，则闭锁全部子模块，断开交流开关，处理异常子模块，直至无子模块异常，触发第二操作控制单元；
    所述第二操作控制单元，用于操作所述附加回路，使所述装置的直流端口等效为短路，所述模块化多电平换流器的直流端口等效为短路；然后触发充电模块；
    所述充电模块，用于对所述模块化多电平换流器执行充电策略，直至达到投入条件，然后触发第三操作控制单元；
    所述第三操作控制单元，用于操作所述附加回路，将所述模块化多电平换流器投入直流运行回路中。
  15. 根据权利要求14所述的系统，其中，所述模块化多电平换流器的子模块包括全桥型子模块和半桥型子模块，或者全部为全桥型子模块。
PCT/CN2020/078853 2019-04-03 2020-03-11 模块化多电平换流器带电投入运行的方法及控制系统 WO2020199880A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910267468.X 2019-04-03
CN201910267468.XA CN109980673B (zh) 2019-04-03 2019-04-03 一种模块化多电平换流器带电投入运行的方法及控制系统

Publications (1)

Publication Number Publication Date
WO2020199880A1 true WO2020199880A1 (zh) 2020-10-08

Family

ID=67082975

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2020/078853 WO2020199880A1 (zh) 2019-04-03 2020-03-11 模块化多电平换流器带电投入运行的方法及控制系统

Country Status (2)

Country Link
CN (1) CN109980673B (zh)
WO (1) WO2020199880A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114167167A (zh) * 2021-11-15 2022-03-11 许继集团有限公司 一种模块化多电平换流器短路电流试验装置及试验方法
WO2023151607A1 (zh) * 2022-02-11 2023-08-17 华北电力科学研究院有限责任公司 柔性直流输电电压源换流阀试验方法及电源装置

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109980673B (zh) * 2019-04-03 2022-07-22 南京南瑞继保电气有限公司 一种模块化多电平换流器带电投入运行的方法及控制系统
CN111835217A (zh) * 2020-06-16 2020-10-27 上海电机学院 一种模块化多电平换流器交流侧预充电方法
CN114070107B (zh) * 2020-07-31 2023-08-08 南京南瑞继保电气有限公司 混合型换流器的充电控制方法及装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106712238A (zh) * 2017-01-16 2017-05-24 南京南瑞继保电气有限公司 一种子模块混合型换流器的充电方法
CN106849016A (zh) * 2017-01-23 2017-06-13 许继集团有限公司 一种mmc子模块故障保护方法及装置
CN107732954A (zh) * 2017-11-22 2018-02-23 南京南瑞继保电气有限公司 一种电压源换流器单元在线投入控制方法及装置
CN109980673A (zh) * 2019-04-03 2019-07-05 南京南瑞继保电气有限公司 一种模块化多电平换流器带电投入运行的方法及控制系统

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106712248B (zh) * 2017-01-16 2019-06-18 南京南瑞继保电气有限公司 一种子模块混合型换流器的充电方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106712238A (zh) * 2017-01-16 2017-05-24 南京南瑞继保电气有限公司 一种子模块混合型换流器的充电方法
CN106849016A (zh) * 2017-01-23 2017-06-13 许继集团有限公司 一种mmc子模块故障保护方法及装置
CN107732954A (zh) * 2017-11-22 2018-02-23 南京南瑞继保电气有限公司 一种电压源换流器单元在线投入控制方法及装置
CN109980673A (zh) * 2019-04-03 2019-07-05 南京南瑞继保电气有限公司 一种模块化多电平换流器带电投入运行的方法及控制系统

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114167167A (zh) * 2021-11-15 2022-03-11 许继集团有限公司 一种模块化多电平换流器短路电流试验装置及试验方法
CN114167167B (zh) * 2021-11-15 2024-02-09 许继集团有限公司 一种模块化多电平换流器短路电流试验装置及试验方法
WO2023151607A1 (zh) * 2022-02-11 2023-08-17 华北电力科学研究院有限责任公司 柔性直流输电电压源换流阀试验方法及电源装置

Also Published As

Publication number Publication date
CN109980673B (zh) 2022-07-22
CN109980673A (zh) 2019-07-05

Similar Documents

Publication Publication Date Title
WO2020199880A1 (zh) 模块化多电平换流器带电投入运行的方法及控制系统
KR102070553B1 (ko) 서브모듈 기반 하이브리드 컨버터의 충전 방법
WO2018130205A1 (zh) 一种子模块混合型换流器的充电方法
WO2019227979A1 (zh) 一种混合直流换流器阀组在线投入电路和投入方法及装置
WO2017024598A1 (zh) Mmc-hvdc系统及其直流侧隔离装置和隔离方法
US20230208354A1 (en) Direct current combiner box, inverter, photovoltaic system, and protection method
WO2017181928A1 (zh) 一种桥式电路、直流电流分断装置及其控制方法
TWI620397B (zh) 不斷電電源裝置
CN110011282B (zh) 一种直流短路故障性质判断方法及直流系统重合闸方法
CN206602450U (zh) 一种具有直流短路电流自清除能力的mmc子模块
WO2020228701A1 (zh) 一种光伏逆变器及其光伏发电系统
WO2014111035A1 (zh) 一种模块化多电平换流器的充电方法
CN106981980A (zh) 一种全桥mmc启动控制方法及系统
BR102013030827A2 (pt) sistema de conversão de potência e método para operar um sistema de conversão de potência
CN105356411A (zh) 一种桥式电路、高压直流断路器及其控制方法
US20230402972A1 (en) Photovoltaic system, power supply system, and insulation fault detection method
CN116615851A (zh) 一种光伏系统、直流汇流箱及故障隔离方法
CN110994560B (zh) 一种低损耗模块化多电平换流器故障穿越方法
CN112039360A (zh) 一种具备故障电流阻断和自均压能力的mmc子模块
Yang et al. Open-Circuit fault diagnosis and tolerant method of multiport triple active-bridge DC-DC converter
CN215222012U (zh) 一种模块化多电平变换器子模块冗余配置电路
CN105978375B (zh) 适用于远距离大容量架空线输电的交叉型子模块及其mmc控制方法
CN107317339A (zh) 一种多重冗余配置的电压源型调节装置及其控制方法
CN112309743A (zh) 一种双向γ源直流零电流分断固态断路器
US8369050B2 (en) Circuit for protecting a DC network with DC loads against overvoltage

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20784091

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20784091

Country of ref document: EP

Kind code of ref document: A1