WO2022022459A1 - 混合型换流器的充电控制方法及装置 - Google Patents

混合型换流器的充电控制方法及装置 Download PDF

Info

Publication number
WO2022022459A1
WO2022022459A1 PCT/CN2021/108431 CN2021108431W WO2022022459A1 WO 2022022459 A1 WO2022022459 A1 WO 2022022459A1 CN 2021108431 W CN2021108431 W CN 2021108431W WO 2022022459 A1 WO2022022459 A1 WO 2022022459A1
Authority
WO
WIPO (PCT)
Prior art keywords
module
bridge sub
average voltage
full
bypass
Prior art date
Application number
PCT/CN2021/108431
Other languages
English (en)
French (fr)
Inventor
胡兆庆
胡仙来
张君君
董云龙
卢宇
田杰
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
Priority to BR112022027056A priority Critical patent/BR112022027056A2/pt
Priority to DE112021001765.9T priority patent/DE112021001765T5/de
Publication of WO2022022459A1 publication Critical patent/WO2022022459A1/zh

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • 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

  • the present application relates to the field of high-voltage flexible DC power transmission and distribution, and in particular, to a charging control method, device, electronic device and computer-readable medium for a hybrid inverter.
  • the ratio of the full-bridge sub-module to the half-bridge sub-module changes dynamically due to faults, maintenance and other conditions.
  • the half-pressure operation is transformed into the full-pressure operation.
  • the bypass valve group needs to complete the charging in the state where the positive and negative terminals of the DC side are short-circuited, that is, the DC terminal is short-circuited for charging, and finally unlocked and connected to the power transmission circuit in series.
  • the purpose of the present application is to provide a charging control method for a hybrid converter, aiming at a modular multi-level converter in which full-bridge and half-bridge sub-modules are mixed together, so that all sub-modules of the converter are uniform and uniform before unlocking. Charge steadily to the rated value to complete the charging process.
  • the present application provides a charging control method for a hybrid converter, wherein each bridge arm of the converter includes a set of full-bridge sub-modules and a set of half-bridge sub-modules, and the DC terminal of the converter is kept in a short-circuit state , the charging control method includes:
  • the second bypass is performed on the half-bridge sub-modules in all bridge arms one by one until the third
  • the number of secondary bypasses reaches the second set value or the average voltage of the full-bridge sub-module is equal to the average voltage of the half-bridge sub-module;
  • performing the first bypass on the full-bridge sub-modules in all the bridge arms one by one includes: the number of the first bypass is gradually and continuously increased at a first rate from zero.
  • the first bypass includes:
  • the two turn-off switching devices directly connected to the positive electrode of the capacitor are turned on at the same time, and the other two turn-off switching devices remain locked;
  • the two turn-off switching devices directly connected to the negative pole of the capacitor are turned on at the same time, and the other two turn-off switching devices remain latched; or
  • One of the turn-off switching devices is turned on, and the remaining turn-off switching devices remain in a latched state.
  • the second bypass is performed on the half-bridge sub-modules in all the bridge arms one by one, including:
  • the number of second bypasses increases gradually and continuously at the second rate from zero.
  • the second bypass includes:
  • the turn-off switching device whose two ends are directly connected to the output terminal is turned on, and the other turn-off switching device is kept in a latching state.
  • dynamically adjusting the number of the first bypass and the number of the second bypass according to the average voltage of the full-bridge sub-module, the average voltage of the half-bridge sub-module, and the rated charging voltage includes:
  • the total number of bypasses is dynamically adjusted according to the difference between the average voltage of the sub-module and the rated charging voltage, including:
  • the total number of bypasses is gradually adjusted at a third rate according to the difference.
  • the voltage coefficient is calculated according to the average voltage of the full-bridge sub-module and the average voltage of the half-bridge sub-module, including:
  • K is the voltage coefficient
  • 0 ⁇ K ⁇ 1 is the average voltage of the full-bridge sub-module
  • V2 is the average voltage of the half-bridge sub-module
  • kp is the proportional coefficient
  • the value range is 0-100
  • k T is the integral coefficient
  • adjusting the number of the first bypass and the number of the second bypass according to the voltage coefficient and the total number of bypasses includes:
  • N (1-K)*Q
  • K is the voltage coefficient
  • Q is the total number of bypasses
  • M is the number of first bypasses
  • N is the number of second bypasses.
  • the charging control method further includes:
  • the charging resistance switch is closed to enter the second charging stage.
  • the DC end of the converter includes:
  • the first charging stage includes:
  • controllable turn-off devices of all full-bridge sub-modules or half-bridge sub-modules are kept in a latched state, and the AC voltage naturally charges the capacitors in the sub-modules through the anti-parallel diodes with the controllable turn-off devices.
  • the first rate, the second rate, and the third rate may be set as constant values.
  • a charging control device for a hybrid inverter comprising:
  • the first control module is used to perform the first bypass on the full-bridge sub-modules in all the bridge arms one by one after the charging resistance switch on the charging line is closed, until the number of the first bypasses of the full-bridge sub-modules reaches the first
  • the set value or the average voltage of the full-bridge sub-module is equal to the average voltage of the half-bridge sub-module;
  • the second control module when the number of the first bypasses reaches the first set value and the average voltage of the full-bridge sub-modules is not equal to the average voltage of the half-bridge sub-modules, performs a second bypass for the half-bridge sub-modules in all the bridge arms one by one until the number of second bypasses of the half-bridge sub-module reaches the second set value or the average voltage of the full-bridge sub-module is equal to the average voltage of the half-bridge sub-module;
  • a dynamic adjustment module configured to dynamically adjust the number of the first bypass and the number of the second bypass according to the average voltage of the full-bridge sub-module, the average voltage of the half-bridge sub-module and the rated charging voltage;
  • the dynamic execution module is used for the average voltage of the full-bridge sub-module and the half-bridge sub-module to execute the first bypass and the second bypass according to the dynamically adjusted number of the first bypass and the second bypass respectively, until the full-bridge sub-module Both the average voltage and the half-bridge sub-module average voltage reach the rated voltage.
  • a charging control electronic device for a hybrid inverter including:
  • processors one or more processors
  • a storage device for storing one or more programs
  • the one or more processors When the one or more programs are executed by the one or more processors, the one or more processors implement the above-mentioned charging control method.
  • a computer-readable medium on which a computer program is stored, and when the computer program is executed by a processor, the above-mentioned charging control method is implemented.
  • FIG. 1 shows a schematic structural diagram of a hybrid converter according to an exemplary embodiment of the present application.
  • FIG. 2 shows a schematic structural diagram of a full-bridge sub-module according to an exemplary embodiment of the present application.
  • FIG. 3 shows a schematic structural diagram of a half-bridge sub-module according to an exemplary embodiment of the present application.
  • FIG. 4 shows a schematic diagram of a connection circuit of a hybrid converter according to an exemplary embodiment of the present application.
  • FIG. 5 shows a flowchart of a charging control method according to an exemplary embodiment of the present application.
  • FIG. 6 shows a flowchart of a charging control method according to another exemplary embodiment of the present application.
  • FIG. 7A shows a schematic diagram of a blocking state of a full-bridge sub-module according to an exemplary embodiment of the present application.
  • FIG. 7B shows a schematic diagram of a blocking state of a full-bridge sub-module according to another exemplary embodiment of the present application.
  • FIG. 8A shows a schematic diagram 1 of bypassing a full-bridge sub-module according to an exemplary embodiment of the present application.
  • FIG. 8B shows schematic diagram 1 of the bypass of the full-bridge sub-module according to another exemplary embodiment of the present application.
  • FIG. 9A shows a second schematic diagram of the bypass of the full-bridge sub-module according to an exemplary embodiment of the present application.
  • FIG. 9B shows a second schematic diagram of the bypass of the full-bridge sub-module according to another exemplary embodiment of the present application.
  • FIG. 10A shows a third schematic diagram of the bypass of the full-bridge sub-module according to an exemplary embodiment of the present application.
  • FIG. 10B shows a third schematic diagram of the bypass of the full-bridge sub-module according to an exemplary embodiment of the present application.
  • FIG. 11A shows a schematic diagram of a blocking state of a half-bridge sub-module according to an exemplary embodiment of the present application.
  • FIG. 11B shows a schematic diagram of a blocking state of a half-bridge sub-module according to another exemplary embodiment of the present application.
  • FIG. 12A shows a schematic diagram of a bypass of a half-bridge sub-module according to an example embodiment of the present application.
  • FIG. 12B shows a schematic diagram of a bypass of a half-bridge sub-module according to another exemplary embodiment of the present application.
  • FIG. 13 shows a block diagram of a charging control apparatus according to an exemplary embodiment of the present application.
  • FIG. 14 shows a block diagram of a charging control electronic device according to an exemplary embodiment of the present application.
  • the voltage equalization effect and steady-state voltage control effect of the sub-module capacitors are very limited.
  • the problem caused by this is that the voltage and current have a large impact at the moment of unlocking, which makes it impossible to make the voltage of all sub-modules reach the rated voltage smoothly during the charging phase, which does not really meet the needs of engineering applications.
  • the present application proposes a charging control method, which is applied to the full-bridge and half-bridge hybrid converters with short-circuit at the DC side, so that the commutation Before the device is unlocked, the capacitor voltages of all sub-modules can be uniformly and stably charged to the rated voltage value, and can remain constant at the rated voltage value for a long time before the unlock command arrives.
  • the ratio of the number of modules has good adaptability.
  • FIG. 1 shows a schematic structural diagram of a hybrid converter according to an exemplary embodiment of the present application.
  • a hybrid converter 1000 includes three phases and six bridge arms, and each phase includes an upper bridge arm (positive pole) and a lower bridge arm (negative pole). Taking phase C as an example, it includes an upper bridge arm 200 and a lower bridge arm 100 . Both the upper bridge arm 200 and the lower bridge arm 100 include a set of full-bridge sub-modules 220 and a set of half-bridge sub-modules 110 (one full-bridge sub-module 220 and one half-bridge sub-module 110 are illustrated in the figure). In each bridge arm, the number of full-bridge sub-modules 220 and half-bridge sub-modules 110 is determined by the parameters of the converter. All the DC terminals of the upper bridge arms 200 form the P terminals 300, and the DC terminals of the lower bridge arms 100 form the N terminals 400.
  • FIG. 2 shows a schematic structural diagram of a full-bridge sub-module according to an exemplary embodiment of the present application.
  • the full-bridge sub-module 220 includes four identical turn-off devices, namely, a first turn-off device 221 , a second turn-off device 222 , a third turn-off device 223 , and a fourth turn-off device 221 .
  • disconnection device 224 and first capacitor 225 .
  • FIG. 3 shows a schematic structural diagram of a half-bridge sub-module according to an exemplary embodiment of the present application.
  • the half-bridge sub-module 110 includes two identical turn-off devices, ie, a fifth turn-off device 111 , a sixth turn-off device 112 , and a second capacitor 113 .
  • FIG. 4 shows a schematic diagram of a connection circuit of a hybrid converter according to an exemplary embodiment of the present application.
  • connection circuit of the converter 1000 in the flexible DC converter station is shown in FIG. 4 .
  • the AC side of the inverter 1000 is connected to the AC power grid 2400 through the charging resistor 2300 , its bypass switch 2200 , and the incoming line switch 2100 .
  • FIG. 5 shows a flowchart of a charging control method according to an exemplary embodiment of the present application.
  • a charging control method for a hybrid inverter including:
  • step S510 after the charging resistance switch on the charging line is closed, the first bypass is performed on the full-bridge sub-modules in all bridge arms one by one, until the number of first bypasses of the full-bridge sub-modules reaches the first set value Or the average voltage of the full-bridge sub-module is equal to the average voltage of the half-bridge sub-module.
  • the DC end of the converter includes: a terminal for outputting a positive DC voltage (for example, 300 in FIG. 1 ), a terminal for outputting a negative DC voltage (for example, 400 in FIG. 1 ), or an equivalent terminal directly connected to the aforementioned two terminals .
  • the inverter In the first charging stage, the inverter is charged uncontrolled with a charging resistor (2300 in FIG. 4). In the first charging stage, the controllable turn-off devices of all full-bridge sub-modules or half-bridge sub-modules are kept in a latched state, and the AC voltage is naturally supplied to the capacitors in the sub-modules through the anti-parallel diodes with the controllable turn-off devices. Charge.
  • the control system of the flexible DC converter station can judge the natural charging state through the current and time delay. For example, if the charging current is less than the set value I set , it can be determined that the first charging stage enters a stable state. Among them, Iset ⁇ 0.1pu .
  • the charging resistance switch (2200 in FIG. 4 ) in the charging circuit is closed to enter the second charging stage. Bypass the charging resistor. At this time, the capacitor voltage of the full-bridge sub-module is high and the capacitor voltage of the half-bridge sub-module is extremely low.
  • the specific size is related to the ratio of the number of full-bridge/half-bridge sub-modules.
  • the charging resistor switch on the charging line is closed, the charging resistor is bypassed.
  • the capacitor voltage of the full-bridge sub-module is high and the capacitor voltage of the half-bridge sub-module is extremely low.
  • the specific size is proportional to the number of full-bridge modules and half-bridge sub-modules. related. In order to increase the average voltage of the half-bridge sub-modules of all bridge arms to equalize with the average voltage of the full-bridge sub-modules, bypass the full-bridge sub-modules in all bridge arms one by one, that is, the first bypass, until the full-bridge sub-modules are bypassed one by one.
  • the first bypass number of the module reaches the first set value or the average voltage of the full-bridge sub-module is equal to the average voltage of the half-bridge sub-module.
  • the number of first bypasses of the full-bridge sub-module starts from zero, and gradually and continuously increases according to the first rate.
  • the first rate may be set as a constant value.
  • the unbypassed full-bridge submodules and all half-bridge submodules remain latched.
  • the capacitors of the half-bridge sub-modules are charged, and the average voltage of the half-bridge sub-modules rises.
  • the first bypass is stopped.
  • the increase of the first bypass number of the full-bridge submodule also stops. The first bypass number of the full-bridge sub-module is maintained as the current value.
  • the first set value is a theoretical value calculated according to when the voltages of the full-bridge sub-module and the half-bridge sub-module are equal. In the actual charging process, it is often not consistent with the theoretical value. Therefore, when the first bypass number of the full-bridge sub-modules reaches the first set value, bypassing more full-bridge sub-modules may be stopped.
  • step S520 when the number of the first bypasses reaches the first set value and the average voltage of the full-bridge sub-modules is not equal to the average voltage of the half-bridge sub-modules, the second bypass is performed on the half-bridge sub-modules in all the bridge arms one by one Until the second bypass number of the half-bridge sub-module reaches the second set value or the average voltage of the full-bridge sub-module is equal to the average voltage of the half-bridge sub-module.
  • the half-bridge sub-module may be bypassed, that is, the second bypass.
  • the number of second bypasses of the half-bridge sub-modules starts from zero and increases gradually and continuously according to the second rate.
  • the second rate may be set as a constant value.
  • the half bridges that are not bypassed remain blocked.
  • the capacitance of the half-bridge sub-module is further charged, and the average voltage of the half-bridge sub-module continues to rise.
  • the second bypass is stopped.
  • the increase of the number of second bypasses of the half-bridge submodule also stops.
  • the first bypass quantity of the half-bridge submodule is maintained as the current value, and the sum of the current first bypass quantity of the full-bridge submodule and the second bypass quantity of the half-bridge submodule, that is, the total bypass quantity is recorded.
  • the second set value is a theoretical value calculated according to when the voltages of the full-bridge sub-module and the half-bridge sub-module are equal. In the actual charging process, it is often not consistent with the theoretical value. Therefore, when the second bypass quantity of the half-bridge sub-modules reaches the second set value, bypassing more half-bridge sub-modules may be stopped.
  • step S530 dynamically adjust the number of the first bypass and the number of the second bypass according to the average voltage of the full-bridge sub-module, the average voltage of the half-bridge sub-module and the rated charging voltage.
  • the average voltage of the full-bridge sub-module and the average voltage of the half-bridge sub-module have not reached the rated charging voltage.
  • the number of the first bypass of the full-bridge sub-module and the number of the second bypass of the half-bridge sub-module are adjusted dynamically through a comprehensive , to achieve a stable voltage rise.
  • the average voltage of the sub-modules may be calculated according to the average voltage of the full-bridge sub-module and the average voltage of the half-bridge sub-module.
  • the total number of bypasses is dynamically adjusted according to the difference between the average voltage of the sub-module and the rated charging voltage, for example, the total number of bypasses is gradually adjusted according to the difference according to a third rate. part of the adjustment.
  • the first number of bypasses and the number of second bypasses are allocated according to the voltage coefficient and the total number of bypasses. For example, according to the proportional relationship between the average voltage of the full-bridge sub-module and the average voltage of the half-bridge sub-module, the total number of bypasses is allocated to the number of the first bypass and the number of the second bypass.
  • the voltage coefficient K can be calculated according to the average voltage of the full-bridge sub-module and the average voltage of the half-bridge sub-module
  • K is the voltage coefficient, 0 ⁇ K ⁇ 1
  • V1 is the average voltage of the full-bridge sub-module
  • V2 is the average voltage of the half-bridge sub-module
  • kp is the proportional coefficient
  • the value range is 0-100
  • k T is the integral coefficient
  • the value range is 0-100.
  • kp and k T can be selected according to the actual adjustment effect during the dynamic adjustment process.
  • N (1-K)*Q
  • K is the voltage coefficient
  • Q is the total number of bypasses
  • M is the number of first bypasses
  • N is the number of second bypasses.
  • step S540 the average voltage of the full-bridge sub-module and the half-bridge sub-module execute the first bypass and the second bypass according to the dynamically adjusted first and second bypass numbers, respectively, until the average voltage of the full-bridge sub-module is reached.
  • the average voltage of the half-bridge sub-modules reaches the rated voltage.
  • FIG. 6 shows a flowchart of a charging control method according to another exemplary embodiment of the present application.
  • a charging control method includes:
  • step S610 the incoming switch in the connection line is closed to enter the first charging stage.
  • step S620 it is determined whether the first charging stage has reached a stable state, or whether the full-bridge sub-module has successfully obtained energy. If the judgment condition is satisfied, step S630 is executed. If the judgment condition is not satisfied, go to step S620.
  • step S630 the charging resistor switch is closed to bypass the charging resistor.
  • step S640 the full-bridge sub-modules are bypassed one by one, that is, the first bypass quantity of the full-bridge sub-modules is gradually increased from zero.
  • step S650 it is determined whether the average voltage of the full-bridge sub-module is equal to the average voltage of the half-bridge sub-module. If the judgment condition is satisfied, step S700 is executed. If the judgment condition is not satisfied, step S660 is executed.
  • step S660 it is determined whether the number of first bypasses of the full-bridge sub-module reaches a first set value. If the judgment condition is satisfied, step S670 is executed. If the judgment condition is not satisfied, step S640 is executed.
  • step S670 when the number of first bypasses reaches the first set value and the average voltage of the full-bridge submodule is not equal to the average voltage of the half-bridge submodule, the number of second bypasses of the half-bridge submodule is gradually increased from zero.
  • step S680 it is determined whether the average voltage of the full-bridge sub-module is equal to the average voltage of the half-bridge sub-module. If the judgment condition is satisfied, step S700 is executed. If the judgment condition is not satisfied, step S690 is executed.
  • step S690 it is determined whether the number of second bypasses of the half-bridge sub-module reaches a second set value. If the judgment condition is satisfied, step S700 is executed. If the judgment condition is not satisfied, step S670 is executed.
  • step S700 dynamically adjust the number of the first bypass and the number of the second bypass according to the average voltage of the full-bridge sub-module, the average voltage of the half-bridge sub-module and the rated charging voltage.
  • step S710 the full-bridge sub-module and the half-bridge sub-module are bypassed respectively according to the dynamically adjusted first bypass quantity and the second bypass quantity.
  • step S720 it is determined whether the average voltage of the full-bridge sub-module and the average voltage of the half-bridge sub-module both reach the rated charging voltage. If the judgment condition is satisfied, the execution ends. If the judgment condition is not satisfied, step S700 is executed.
  • FIG. 7A shows a schematic diagram of a blocking state of a full-bridge sub-module according to an exemplary embodiment of the present application.
  • FIG. 7B shows a schematic diagram of a blocking state of a full-bridge sub-module according to another exemplary embodiment of the present application.
  • FIG. 8A shows a schematic diagram 1 of bypassing a full-bridge sub-module according to an exemplary embodiment of the present application.
  • FIG. 8B shows schematic diagram 1 of the bypass of the full-bridge sub-module according to another exemplary embodiment of the present application.
  • FIG. 9A shows a second schematic diagram of the bypass of the full-bridge sub-module according to an exemplary embodiment of the present application.
  • FIG. 9B shows a second schematic diagram of the bypass of the full-bridge sub-module according to another exemplary embodiment of the present application.
  • FIG. 10A shows a third schematic diagram of the bypass of the full-bridge sub-module according to an exemplary embodiment of the present application.
  • FIG. 10B shows a third schematic diagram of the bypass of the full-bridge sub-module according to an exemplary embodiment of the present application.
  • the turn-off devices of all the full-bridge sub-modules are in a blocking state, as shown in FIGS. 7A and 7B .
  • the first bypass of the full-bridge sub-module may be performed as shown in FIG. 8A and FIG. 8B , wherein two switchable switching devices in the full-bridge sub-module directly connected to the negative electrode of the capacitor are simultaneously On, the other two turn-off switching devices remain latched.
  • the turn-off switch device Q2f and the turn-off switch device Q4f are turned on, and the turn-off switch device Q1f and the turn-off switch device Q3f remain latched.
  • the first bypass of the full-bridge sub-module may also be performed in the manner shown in FIG. 9A and FIG. 9B , wherein two switchable switching devices in the full-bridge sub-module are directly connected to the positive electrode of the capacitor.
  • the other two turn-off switching devices remain latched.
  • the turn-off switch device Q2f and the turn-off switch device Q4f are kept latched, and the turn-off switch device Q1f and the turn-off switch device Q3f are turned on.
  • the first bypass of the full-bridge sub-module may also be performed in the manner of FIG. 10A and FIG. 10B , one of the switchable switching devices is turned on, and the remaining switchable switching devices are kept in a locked state.
  • the turn-off switching device Q3f is turned on, and the remaining turn-off switching devices remain latched.
  • FIG. 11A shows a schematic diagram of a blocking state of a half-bridge sub-module according to an exemplary embodiment of the present application.
  • FIG. 11B shows a schematic diagram of a blocking state of a half-bridge sub-module according to another exemplary embodiment of the present application.
  • FIG. 12A shows a schematic diagram of a bypass of a half-bridge sub-module according to an example embodiment of the present application.
  • FIG. 12B shows a schematic diagram of a bypass of a half-bridge sub-module according to another exemplary embodiment of the present application.
  • the turn-off devices of all the half-bridge sub-modules are in a blocking state, as shown in FIGS. 11A and 11B .
  • the second bypass of the half-bridge sub-module may be performed in the manner shown in FIG. 12A and FIG. 12B , wherein the switchable switch device whose two ends are directly connected to the output terminal is turned on, and the other switch is turned off.
  • the switching device remains latched.
  • the turn-off switching device Q2f is turned on, and the turn-off switching device Q1f remains latched.
  • the dotted line and the pointed tip in FIGS. 7A , 8A, 9A, 10A, 11A, and 12A represent a current direction in this state.
  • the current direction is the flow direction from top to bottom, which is naturally generated during the charging process.
  • the dotted line and the pointed tip in FIGS. 7B, 8B, 9B, 10B, 11B, and 12B indicate another current direction in this state.
  • the current direction is the flow direction from bottom to top, and the current direction is also naturally generated during the charging process.
  • FIG. 13 shows a block diagram of a charging control apparatus according to an exemplary embodiment of the present application.
  • a charging control device 1100 for a hybrid inverter including a first control module 1110 , a second control module 1120 , a dynamic adjustment module 1130 and a dynamic execution module 1140 .
  • the first control module 1110 is used to perform the first bypass on the full-bridge sub-modules in all the bridge arms one by one after the charging resistance switch on the charging line is closed, until the number of the first bypasses of the full-bridge sub-modules reaches the number of the first bypass.
  • a set value or the average voltage of the full-bridge sub-module is equal to the average voltage of the half-bridge sub-module;
  • the second control module 1120 when the number of the first bypasses reaches the first set value and the average voltage of the full-bridge sub-modules is not equal to the average voltage of the half-bridge sub-modules, performs the second control on the half-bridge sub-modules in all the bridge arms one by one. bypassing until the number of second bypasses of the half-bridge sub-modules reaches the second set value or the average voltage of the full-bridge sub-modules is equal to the average voltage of the half-bridge sub-modules;
  • a dynamic adjustment module 1130 configured to dynamically adjust the number of the first bypass and the number of the second bypass according to the average voltage of the full-bridge sub-module, the average voltage of the half-bridge sub-module and the rated charging voltage;
  • the dynamic execution module 1140 is used for the average voltage of the full-bridge sub-module and the half-bridge sub-module to execute the first bypass and the second bypass according to the dynamically adjusted number of the first bypass and the number of the second bypass, respectively, until the full-bridge
  • the average voltage of the module and the average voltage of the half-bridge sub-modules both reach the rated voltage.
  • FIG. 14 shows a block diagram of a charging control electronic device according to an exemplary embodiment of the present application.
  • the present application also provides a charging control electronic device 700 for a hybrid inverter.
  • the electronic device 700 shown in FIG. 14 is only an example, and should not impose any limitations on the functions and scope of use of the embodiments of the present application.
  • electronic device 700 takes the form of a general-purpose computing device.
  • Components of the electronic device 700 may include, but are not limited to, at least one processing unit 710, at least one storage unit 720, a bus 730 connecting different system components (including the storage unit 720 and the processing unit 710), and the like.
  • the storage unit 720 stores program codes, and the program codes can be executed by the processing unit 710, so that the processing unit 710 executes the charging control methods described in this specification according to the above embodiments of the present application.
  • the storage unit 720 may include a readable medium in the form of a volatile storage unit, such as a random access storage unit (RAM) 7201 and/or a cache storage unit 7202 , and may further include a read only storage unit (ROM) 7203 .
  • RAM random access storage unit
  • ROM read only storage unit
  • the storage unit 720 may also include a program/utility 7204 having a set (at least one) of program modules 7205 including, but not limited to, an operating system, one or more application programs, other program modules, and program data, An implementation of a network environment may be included in each or some combination of these examples.
  • the bus 730 may be representative of one or more of several types of bus structures, including a memory cell bus or memory cell controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local area using any of a variety of bus structures bus.
  • the electronic device 700 may also communicate with one or more external devices 7001 (eg, touch screens, keyboards, pointing devices, Bluetooth devices, etc.), and may also communicate with one or more devices that enable a user to interact with the electronic device 700, and/or Or with any device (eg, router, modem, etc.) that enables the electronic device 700 to communicate with one or more other computing devices. Such communication may take place through input/output (I/O) interface 750 . Also, the electronic device 700 may communicate with one or more networks (eg, a local area network (LAN), a wide area network (WAN), and/or a public network such as the Internet) through a network adapter 760 . Network adapter 760 may communicate with other modules of electronic device 700 through bus 730 . It should be appreciated that, although not shown, other hardware and/or software modules may be used in conjunction with electronic device 700, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives and data backup storage systems.
  • the charging control method of the hybrid converter provided by the present application, by adjusting the number of bypasses of full-bridge sub-modules and half-bridge sub-modules in different charging stages, so that the capacitances of all bridge arm sub-modules are uniformly and stably charged to the rated value , instead of relying on the voltage detection and comparison between different phases on the charging valve side of the converter, less data needs to be collected, and the control process is simplified.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Dc-Dc Converters (AREA)

Abstract

本申请提供一种混合型换流器的充电控制方法，包括：对所有桥臂中的全桥子模块逐个进行第一旁路，直至第一旁路数量达到第一设定值或全桥子模块平均电压与半桥子模块平均电压相等；当第一旁路数量达到第一设定值且全桥子模块平均电压与半桥子模块平均电压不等时，对所有桥臂中的半桥子模块逐个进行第二旁路直至所述第二旁路数量达到第二设定值或全桥子模块平均电压与半桥子模块平均电压相等；根据全桥子模块平均电压、半桥子模块平均电压和额定充电电压，动态调整第一旁路数量和第二旁路数量；按照动态调整后的第一旁路数量和第二旁路数量执行，直至全桥子模块平均电压和半桥子模块平均电压均达到额定电压。从而从使得所有子模块平稳达到额定电压。

Description

混合型换流器的充电控制方法及装置 技术领域
本申请涉及高压柔性直流输配电领域，具体涉及一种混合型换流器的充电控制方法、装置、电子设备及计算机可读介质。
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。同时，由于对直流架空线线路故障保护的应用需求，每个换流器将采用全桥子模块与半桥子模块混合联接的方式，以达到快速隔离直流线路故障的目的。
在工程运行的过程中，全桥子模块与半桥子模块的比例因为故障、维修等情况动态变化。对于此类结构的混合型换流器，存在一种重要的工况，即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，旁路阀组需要在直流侧正负极两端短路的状态下完成充电，即直流端短路充电，最终解锁并串入功率传输回路中。
发明内容
本申请旨在提供一种混合型换流器的充电控制方法，针对全桥和半桥子模块混联的模块化多电平换流器，实现换流器在解锁前所有子模块都均匀、稳定地充电到额定值，完成充电过程。
本申请提供一种混合型换流器的充电控制方法，所述换流器的桥臂均包括一组全桥子模块和一组半桥子模块，所述换流器直流端保持为短路状态，所述充电控制方法包括：
对所有桥臂中的全桥子模块逐个进行第一旁路，直至第一旁路数量达 到第一设定值或全桥子模块平均电压与半桥子模块平均电压相等；
当第一旁路数量达到第一设定值且全桥子模块平均电压与半桥子模块平均电压不等时，对所有桥臂中的半桥子模块逐个进行第二旁路直至所述第二旁路数量达到第二设定值或全桥子模块平均电压与半桥子模块平均电压相等；
根据全桥子模块平均电压、半桥子模块平均电压和额定充电电压，动态调整第一旁路数量和第二旁路数量；
按照动态调整后的第一旁路数量和第二旁路数量执行，直至全桥子模块平均电压和半桥子模块平均电压均达到额定电压。
根据本申请的一些实施例，对全部桥臂中的全桥子模块逐个进行第一旁路，包括：第一旁路数量从零开始按照第一速率逐渐连续增加。
根据本申请的一些实施例，第一旁路，包括：
所述全桥子模块中与电容正极直接相连的两个可关断开关器件同时导通，另外两个可关断开关器件保持闭锁；或者
与电容负极直接相连的两个可关断开关器件同时导通，另外两个可关断开关器件保持闭锁；或者
其中一个可关断开关器件导通，其余可关断开关器件保持闭锁状态。
根据本申请的一些实施例，对全部桥臂中的半桥子模块逐个进行第二旁路，包括：
第二旁路数量从零开始按照第二速率逐渐连续增加。
根据本申请的一些实施例，第二旁路，包括：
两端直接与输出端子相连的可关断开关器件导通，另一可关断开关器件保持闭锁。
根据本申请的一些实施例，根据全桥子模块平均电压、半桥子模块平均电压和额定充电电压，动态调整所述第一旁路数量和第二旁路数量，包括：
根据全桥子模块平均电压与半桥子模块平均电压计算子模块平均电压；
根据子模块平均电压与额定充电电压的差值动态调整总旁路数量；
根据全桥子模块平均电压与半桥子模块平均电压计算电压系数；
根据电压系数和总旁路数量调整第一旁路数量和第二旁路数量。
根据本申请的一些实施例，根据子模块平均电压与额定充电电压的差值动态调整总旁路数量，包括：
根据所述差值按照第三速率逐步调整所述总旁路数量。
根据本申请的一些实施例，根据全桥子模块平均电压与半桥子模块平均电压计算电压系数，包括：
按以下公式计算电压系数，
K＝V1/(V1+V2)，或者
Figure PCTCN2021108431-appb-000001
其中，K为电压系数，0＜K≤1，V1为全桥子模块平均电压，V2为半桥子模块平均电压，kp为比例系数，取值范围0-100，k T为积分系数，取值范围0-100。
根据本申请的一些实施例，根据电压系数和总旁路数量调整第一旁路数量和第二旁路数量，包括：
按照以下公式计算第一旁路数量和第二旁路数量，
M＝K*Q；
N＝(1-K)*Q；
其中，K为电压系数，Q为总旁路数量，M为第一旁路数量，N为第二旁路数量。
根据本申请的一些实施例，所述充电控制方法还包括：
所述换流器直流端短路状态下，闭合进线开关进入第一充电阶段；
第一充电阶段稳定后，闭合充电电阻开关进入第二充电阶段。
根据本申请的一些实施例，所述换流器直流端包括：
输出正直流电压的端子、输出负直流电压的端子、与前述两个端子直接相连的等效端子。
根据本申请的一些实施例，所述第一充电阶段包括：
所有全桥子模块或半桥子模块的可控关断器件均保持闭锁状态，交流电压通过与所述可控关断器件的反并联二极管给子模块中的电容进行自然充电。
根据本申请的一些实施例，所述第一速率、第二速率、第三速率可作 为定值整定。
根据本申请的第二方面，还提供一种混合型换流器的充电控制装置，包括：
第一控制模块，用于充电线路上的充电电阻开关闭合后，对全部桥臂中的全桥子模块逐个进行第一旁路，直至所述全桥子模块的第一旁路数量达到第一设定值或全桥子模块平均电压与半桥子模块平均电压相等；
第二控制模块，当第一旁路数量达到第一设定值且全桥子模块平均电压与半桥子模块平均电压不等时，对全部桥臂中的半桥子模块逐个进行第二旁路直至所述半桥子模块的第二旁路数量达到第二设定值或全桥子模块平均电压与半桥子模块平均电压相等；
动态调整模块，用于根据全桥子模块平均电压、半桥子模块平均电压和额定充电电压，动态调整所述第一旁路数量和第二旁路数量；
动态执行模块，用于全桥子模块平均电压和半桥子模块分别按照动态调整后的第一旁路数量和第二旁路数量执行第一旁路和第二旁路，直至全桥子模块平均电压和半桥子模块平均电压均达到额定电压。
根据本申请的第三方面，还提供一种混合型换流器的充电控制电子设备，包括：
一个或多个处理器；
存储装置，用于存储一个或多个程序；
当所述一个或多个程序被所述一个或多个处理器执行，使得所述一个或多个处理器实现上述的充电控制方法。
根据本申请的第四方面，还提供一种计算机可读介质，其上存储有计算机程序，所述计算机程序被处理器执行时实现上述的充电控制方法。
本申请的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本申请的实践了解到。
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，还可以根 据这些附图获得其他的附图，而并不超出本申请要求保护的范围。
图1示出根据本申请示例实施例的混合型换流器结构示意图。
图2示出根据本申请示例实施例的全桥子模块结构示意图。
图3示出根据本申请示例实施例的半桥子模块结构示意图。
图4示出根据本申请示例实施例的混合型换流器连接线路示意图。
图5示出根据本申请示例实施例的充电控制方法流程图。
图6示出根据本申请另一示例实施例的充电控制方法流程图。
图7A示出根据本申请示例实施例的全桥子模块闭锁状态示意图。
图7B示出根据本申请另一示例实施例的全桥子模块闭锁状态示意图。
图8A示出根据本申请示例实施例的全桥子模块旁路示意图一。
图8B示出根据本申请另一示例实施例的全桥子模块旁路示意图一。
图9A示出根据本申请示例实施例的全桥子模块旁路示意图二。
图9B示出根据本申请另一示例实施例的全桥子模块旁路示意图二。
图10A示出根据本申请示例实施例的全桥子模块旁路示意图三。
图10B示出根据本申请示例实施例的全桥子模块旁路示意图三。
图11A示出根据本申请示例实施例的半桥子模块闭锁状态示意图。
图11B示出根据本申请另一示例实施例的半桥子模块闭锁状态示意图。
图12A示出根据本申请示例实施例的半桥子模块旁路示意图。
图12B示出根据本申请另一示例实施例的半桥子模块旁路示意图。
图13示出根据本申请示例实施例的充电控制装置组成框图。
图14示出根据本申请示例实施例的充电控制电子设备组成框图。
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。
应理解，虽然本文中可能使用术语第一、第二等来描述各种组件，但这些组件不应受这些术语限制。这些术语乃用以区分一组件与另一组件。因此，下文论述的第一组件可称为第二组件而不偏离本申请概念的教示。如本文中所使用，术语“及/或”包括相关联的列出项目中的任一个及一或多者的所有组合。
本领域技术人员可以理解，附图只是示例实施例的示意图，可能不是按比例的。附图中的模块或流程并不一定是实施本申请所必须的，因此不能用于限制本申请的保护范围。
本申请人发现现有的混合型换流器充电方案均应用于换流器直流侧开路充电工况，且其充电过程中主要依靠解锁运行来最终实现子模块充电到额定电压值，而解锁之前子模块电容的均压效果及稳态电压控制效果都很有限。由此带来的问题是解锁瞬间电压电流冲击较大，从而导致充电阶段无法使所有子模块电压平稳达到额定电压，未真正满足工程应用需求。
针对现有充电方案存在的问题以及混合型换流器直流侧短路充电工况，本申请提出一种充电控制方法，应用于直流端短路的全桥和半桥混合型换流器，使换流器在解锁之前，所有子模块电容电压都能均匀、稳定地充电到额定电压值，并且在解锁指令到达之前能长时间恒定在额定电压值，同时该方法对不同比例的全桥/半桥子模块个数比具有良好的适应性。
以下将结合附图，对本申请的技术方案进行详细说明。
图1示出根据本申请示例实施例的混合型换流器结构示意图。
如图1所示，根据本申请的示例实施例，混合型换流器1000包括三相六个桥臂，每一相均包括上桥臂(正极)和下桥臂(负极)。以C相为例，其包括上桥臂200和下桥臂100。上桥臂200、下桥臂100均包括一组全桥子模块220和一组半桥子模块110(图中以一个全桥子模块220和一个半桥子模块110进行示意)。每个桥臂中，全桥子模块220和半桥子模块110的数量由所述换流器的参数确定。所有上桥臂200的直流端 形成P端子300、下桥臂100的直流端形成N端子400。
图2示出根据本申请示例实施例的全桥子模块结构示意图。
如图2所示，全桥子模块220包括四个相同的可关断器件，即第一可关断器件221、第二可关断器件222、第三可关断器件223、第四可关断器件224，以及第一电容225。
图3示出根据本申请示例实施例的半桥子模块结构示意图。
如图3所示，半桥子模块110包括两个相同的可关断器件，即第五可关断器件111、第六可关断器件112，以及第二电容113。
图4示出根据本申请示例实施例的混合型换流器连接线路示意图。
换流器1000在柔性直流换流站中的连接电路如图4所示。换流器1000的交流侧通过充电电阻2300及其旁路开关2200、进线开关2100与交流电网2400相连。
图5示出根据本申请示例实施例的充电控制方法流程图。
应用于柔性直流换流站的上述换流器，在半压运行变换为全压运行时，需要在直流端短路的状态下完成充电(如图1中的P端子300和N端子400相连)，即直流端短路充电。根据本申请的第一方面，提供一种混合型换流器的充电控制方法，包括：
在步骤S510，充电线路上的充电电阻开关闭合后，对所有桥臂中的全桥子模块逐个进行第一旁路，直至所述全桥子模块的第一旁路数量达到第一设定值或全桥子模块平均电压与半桥子模块平均电压相等。
所述换流器直流端短路状态下，闭合连接线路中的进线开关(图4中的2100)，所述换流器进入第一充电阶段。所述换流器直流端包括：输出正直流电压的端子(例如图1中的300)、输出负直流电压的端子(例如图1中的400)或者与前述两个端子直接相连的等效端子。
在第一充电阶段，换流器带充电电阻(图4中的2300)进行不控充电。在第一充电阶段，所有全桥子模块或半桥子模块的可控关断器件均保持闭锁状态，交流电压通过与所述可控关断器件的反并联二极管给子模块中的电容进行自然充电。
柔性直流换流站的控制系统可通过电流、延时情况等判断自然充电状态。例如，充电电流小于设定值I set，可判断第一充电阶段进入稳定状态。 其中，I set<0.1pu。
当第一充电阶段稳定、全桥子模块取能成功后，闭合充电线路中的充电电阻开关(图4中的2200)进入第二充电阶段。旁路充电电阻，此时全桥子模块电容电压较高而半桥子模块电容电压极低，具体大小与全桥/半桥子模块个数比相关。
充电线路上的充电电阻开关闭合后，充电电阻被旁路，此时全桥子模块电容电压较高而半桥子模块电容电压极低，具体大小与全桥模块、半桥子模块的数量比相关。为了使所有桥臂的半桥子模块平均电压上升至与全桥子模块平均电压均衡，对所有桥臂中的全桥子模块逐个进行旁路，即第一旁路，直至所述全桥子模块的第一旁路数量达到第一设定值或全桥子模块平均电压与半桥子模块平均电压相等。例如，全桥子模块的第一旁路数量从零开始，按照第一速率逐渐连续增加。根据本申请的一些实施例，所述第一速率可作为定值整定。
在此过程中，未旁路的全桥子模块和所有半桥子模块保持闭锁。半桥子模块的电容得到充电，半桥子模块平均电压抬升。当半桥子模块的平均电压与全桥子模块的平均电压相等时，停止第一旁路。此外，当全桥子模块的第一旁路数量达到第一设定值时，无论半桥子模块与全桥子模块平均电压是否均衡，同样停止增加全桥子模块的第一旁路数量。维持全桥子模块的第一旁路数量为当前值。根据本申请的一些实施例，第一设定值是根据全桥子模块和半桥子模块的电压相等时，计算出的理论值。在实际充电过程中，往往无法与理论值吻合。因此，当全桥子模块的第一旁路数量达到第一设定值时，可以停止对更多的全桥子模块进行旁路。
在步骤S520，当第一旁路数量达到第一设定值且全桥子模块平均电压与半桥子模块平均电压不等时，对全部桥臂中的半桥子模块逐个进行第二旁路直至所述半桥子模块的第二旁路数量达到第二设定值或全桥子模块平均电压与半桥子模块平均电压相等。
若经过步骤S510，全桥子模块平均电压与半桥子模块平均电压仍不等时，可以对半桥子模块进行旁路，即第二旁路。例如，半桥子模块的第二旁路数量从零开始，按照第二速率逐渐连续增加。根据本申请的一些实施例，所述第二速率可作为定值整定。
在此过程中，未旁路的半桥子保持闭锁。半桥子模块的电容进一步得到充电，半桥子模块平均电压继续抬升。当半桥子模块的平均电压与全桥子模块的平均电压相等时，停止第二旁路。此外，当半桥子模块的第二旁路数量达到第二设定值时，无论半桥子模块与全桥子模块平均电压是否均衡，同样停止增加半桥子模块的第二旁路数量。维持半桥子模块的第一旁路数量为当前值，同时记录当前全桥子模块的第一旁路数量和半桥子模块的第二旁路数量之和，即总旁路数量。
根据本申请的一些实施例，第二设定值是根据全桥子模块和半桥子模块的电压相等时，计算出的理论值。在实际充电过程中，往往无法与理论值吻合。因此，当半桥子模块的第二旁路数量达到第二设定值时，可以停止对更多的半桥子模块进行旁路。
在步骤S530，根据全桥子模块平均电压、半桥子模块平均电压和额定充电电压，动态调整所述第一旁路数量和第二旁路数量。
经过上述充电过程，全桥子模块平均电压与半桥子模块平均电压未达到额定充电电压。为了使两类子模块的总平均电压逐步、稳定地升至额定值，本申请的充电控制方法中，通过综合动态调整全桥子模块第一旁路数量和半桥子模块第二旁路数量，来实现电压的稳定上升。
根据本申请的一些实施例，可以根据全桥子模块平均电压与半桥子模块平均电压计算子模块平均电压。根据子模块平均电压与额定充电电压的差值动态调整总旁路数量，例如根据所述差值按照第三速率逐步调整总旁路数量，第三速率可以定值整定，也可以为控制策略中的一个环节进行调节。
对总旁路数量调整后，再根据电压系数和总旁路数量分配第一旁路数量和第二旁路数量。例如，按照全桥子模块平均电压与半桥子模块平均电压的比例关系，将总旁路数量分配至第一旁路数量和第二旁路数量。根据本申请的一些实施例，可以根据全桥子模块平均电压与半桥子模块平均电压计算电压系数K，
K＝V1/(V1+V2)，或者
Figure PCTCN2021108431-appb-000002
其中，K为电压系数，0＜K≤1，V1为全桥子模块平均电压，V2为半 桥子模块平均电压。kp为比例系数，取值范围0-100，k T为积分系数，取值范围0-100。其中，kp和k T可以在动态调整过程中，根据实际调整的效果进行选择。
再根据电压系数K和总旁路数量Q调整第一旁路数量和第二旁路数量。例如，按照以下公式计算第一旁路数量和第二旁路数量，
M＝K*Q；
N＝(1-K)*Q；
其中，K为电压系数，Q为总旁路数量，M为第一旁路数量，N为第二旁路数量。
在步骤S540，全桥子模块平均电压和半桥子模块分别按照动态调整后的第一旁路数量和第二旁路数量执行第一旁路和第二旁路，直至全桥子模块平均电压和半桥子模块平均电压均达到额定电压。
图6示出根据本申请另一示例实施例的充电控制方法流程图。
根据本申请另一示例实施例的充电控制方法，如图6所示，包括：
在步骤S610，闭合连接线路中的进线开关，进入第一充电阶段。
在步骤S620，判断第一充电阶段是否达到稳定状态，或者全桥子模块是否取能成功。若满足判断条件，执行步骤S630。若不满足判断条件，继续执行步骤S620。
在步骤S630，闭合充电电阻开关，将充电电阻旁路。
在步骤S640，逐个旁路全桥子模块，即从零开始逐步增大全桥子模块的第一旁路数量。
在步骤S650，判断全桥子模块平均电压与半桥子模块平均电压是否相等。若满足判断条件，执行步骤S700。若不满足判断条件，执行步骤S660。
在步骤S660，判断所述全桥子模块的第一旁路数量是否达到第一设定值。若满足判断条件，执行步骤S670。若不满足判断条件，执行步骤S640。
在步骤S670，当第一旁路数量达到第一设定值且全桥子模块平均电压与半桥子模块平均电压不等时，从零开始逐步增大半桥子模块的第二旁路数量。
在步骤S680，判断全桥子模块平均电压与半桥子模块平均电压是否相等。若满足判断条件，执行步骤S700。若不满足判断条件，执行步骤S690。
在步骤S690，判断所述半桥子模块的第二旁路数量是否达到第二设定值。若满足判断条件，执行步骤S700。若不满足判断条件，执行步骤S670。
在步骤S700，根据全桥子模块平均电压、半桥子模块平均电压和额定充电电压，动态调整所述第一旁路数量和第二旁路数量。
在步骤S710，按照动态调整后的第一旁路数量和第二旁路数量分别对全桥子模块和半桥子模块进行旁路。
在步骤S720，判断全桥子模块平均电压和半桥子模块平均电压是否均达到额定充电电压。若满足判断条件，执行结束。若不满足判断条件，执行步骤S700。
图7A示出根据本申请示例实施例的全桥子模块闭锁状态示意图。
图7B示出根据本申请另一示例实施例的全桥子模块闭锁状态示意图。
图8A示出根据本申请示例实施例的全桥子模块旁路示意图一。
图8B示出根据本申请另一示例实施例的全桥子模块旁路示意图一。
图9A示出根据本申请示例实施例的全桥子模块旁路示意图二。
图9B示出根据本申请另一示例实施例的全桥子模块旁路示意图二。
图10A示出根据本申请示例实施例的全桥子模块旁路示意图三。
图10B示出根据本申请示例实施例的全桥子模块旁路示意图三。
在上述充电控制过程中，在第一充电阶段，所有全桥子模块的可关断器件均处于闭锁状态，如图7A和7B所示。根据本申请的一些实施例，全桥子模块的第一旁路可以按照图8A和图8B的方式进行，其中所述全桥子模块中与电容负极直接相连的两个可关断开关器件同时导通，另外两个可关断开关器件保持闭锁。例如，可关断开关器件Q2f和可关断开关器件Q4f导通，可关断开关器件Q1f和可关断开关器件Q3f保持闭锁。
根据本申请的一些实施例，全桥子模块的第一旁路还可以按照图9A和图9B的方式进行，其中所述全桥子模块中与电容正极直接相连的两个可关断开关器件同时导通，另外两个可关断开关器件保持闭锁。例如，可关断开关器件Q2f和可关断开关器件Q4f保持闭锁，可关断开关器件Q1f和可关断开关器件Q3f导通。
根据本申请的一些实施例，全桥子模块的第一旁路还可以按照图10A和图10B的方式进行，其中一个可关断开关器件导通，其余可关断开关器件保持闭锁状态。例如，可关断开关器件Q3f导通，其余可关断开关器件保持闭锁。
图11A示出根据本申请示例实施例的半桥子模块闭锁状态示意图。
图11B示出根据本申请另一示例实施例的半桥子模块闭锁状态示意图。
图12A示出根据本申请示例实施例的半桥子模块旁路示意图。
图12B示出根据本申请另一示例实施例的半桥子模块旁路示意图。
在上述充电控制过程中，在第一充电阶段，所有半桥子模块的可关断器件均处于闭锁状态，如图11A和11B所示。根据本申请的一些实施例，半桥子模块的第二旁路可以按照图12A和图12B的方式进行，其中两端直接与输出端子相连的可关断开关器件导通，另一可关断开关器件保持闭锁。例如，图12A和图12B中，可关断开关器件Q2f导通，可关断开关器件Q1f保持闭锁。
由于所述换流器的交流端电源在周期性的变化，因此在换流器的各个子模块中产生了两个方向不同的电流方向。图7A、图8A、图9A、图10A、图11A、图12A中的虚线和尖头表示了该状态下的一种电流方向。该电流方向为从上向下的流动方向，该电流方向是在充电过程中自然产生。图7B、图8B、图9B、图10B、图11B、图12B中的虚线和尖头表示了该状态下的另一电流方向。该电流方向为从下向上的流动方向，该电流方向也是在充电过程中自然产生。
图13示出根据本申请示例实施例的充电控制装置组成框图。
根据本申请的第二方面，提供一种混合型换流器的充电控制装置1100，包括第一控制模块1110、第二控制模块1120、动态调整模块1130 和动态执行模块1140。
第一控制模块1110，用于充电线路上的充电电阻开关闭合后，对全部桥臂中的全桥子模块逐个进行第一旁路，直至所述全桥子模块的第一旁路数量达到第一设定值或全桥子模块平均电压与半桥子模块平均电压相等；
第二控制模块1120，当第一旁路数量达到第一设定值且全桥子模块平均电压与半桥子模块平均电压不等时，对全部桥臂中的半桥子模块逐个进行第二旁路直至所述半桥子模块的第二旁路数量达到第二设定值或全桥子模块平均电压与半桥子模块平均电压相等；
动态调整模块1130，用于根据全桥子模块平均电压、半桥子模块平均电压和额定充电电压，动态调整所述第一旁路数量和第二旁路数量；
动态执行模块1140，用于全桥子模块平均电压和半桥子模块分别按照动态调整后的第一旁路数量和第二旁路数量执行第一旁路和第二旁路，直至全桥子模块平均电压和半桥子模块平均电压均达到额定电压。
图14示出根据本申请示例实施例的充电控制电子设备组成框图。
本申请还提供一种混合型换流器的充电控制电子设备700。图14显示的电子设备700仅仅是一个示例，不应对本申请实施例的功能和使用范围带来任何限制。
如图14所示，电子设备700以通用计算设备的形式表现。电子设备700的组件可以包括但不限于：至少一个处理单元710、至少一个存储单元720、连接不同系统组件(包括存储单元720和处理单元710)的总线730等。
存储单元720存储有程序代码，程序代码可以被处理单元710执行，使得处理单元710执行本说明书描述的根据本申请上述各实施例的充电控制方法。
存储单元720可以包括易失性存储单元形式的可读介质，例如随机存取存储单元(RAM)7201和/或高速缓存存储单元7202，还可以进一步包括只读存储单元(ROM)7203。
存储单元720还可以包括具有一组(至少一个)程序模块7205的程序/实用工具7204，这样的程序模块7205包括但不限于：操作系统、一个或者多个应用程序、其它程序模块以及程序数据，这些示例中的每一个或某种组合中可能包括网络环境的实现。
总线730可以为表示几类总线结构中的一种或多种，包括存储单元总线或者存储单元控制器、外围总线、图形加速端口、处理单元或者使用多种总线结构中的任意总线结构的局域总线。
电子设备700也可以与一个或多个外部设备7001(例如触摸屏、键盘、指向设备、蓝牙设备等)通信，还可与一个或者多个使得用户能与该电子设备700交互的设备通信，和/或与使得该电子设备700能与一个或多个其它计算设备进行通信的任何设备(例如路由器、调制解调器等等)通信。这种通信可以通过输入/输出(I/O)接口750进行。并且，电子设备700还可以通过网络适配器760与一个或者多个网络(例如局域网(LAN)，广域网(WAN)和/或公共网络，例如因特网)通信。网络适配器760可以通过总线730与电子设备700的其它模块通信。应当明白，尽管图中未示出，可以结合电子设备700使用其它硬件和/或软件模块，包括但不限于：微代码、设备驱动器、冗余处理单元、外部磁盘驱动阵列、RAID系统、磁带驱动器以及数据备份存储系统等。
本申请提供的混合型换流器的充电控制方法，通过对不同充电阶段中全桥子模块和半桥子模块的旁路数量调整，使得所有桥臂子模块电容均匀、稳定地充电到额定值，而不依赖于换流器充电阀侧不同相之间的电压大小检测和比较，需要采集的数据更少、控制过程更加简化。
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 (16)

  1. 一种混合型换流器的充电控制方法，所述换流器的桥臂均包括一组全桥子模块和一组半桥子模块，所述换流器直流端保持为短路状态，其中，所述充电控制方法包括：
    对所有桥臂中的全桥子模块逐个进行第一旁路，直至第一旁路数量达到第一设定值或全桥子模块平均电压与半桥子模块平均电压相等；
    当第一旁路数量达到第一设定值且全桥子模块平均电压与半桥子模块平均电压不等时，对所有桥臂中的半桥子模块逐个进行第二旁路直至所述第二旁路数量达到第二设定值或全桥子模块平均电压与半桥子模块平均电压相等；
    根据全桥子模块平均电压、半桥子模块平均电压和额定充电电压，动态调整第一旁路数量和第二旁路数量；
    按照动态调整后的第一旁路数量和第二旁路数量执行，直至全桥子模块平均电压和半桥子模块平均电压均达到额定电压。
  2. 根据权利要求1所述的充电控制方法，其中，对全部桥臂中的全桥子模块逐个进行第一旁路，包括：
    第一旁路数量从零开始按照第一速率逐渐连续增加。
  3. 根据权利要求2所述的充电控制方法，其中，第一旁路，包括：
    所述全桥子模块中与电容正极直接相连的两个可关断开关器件同时导通，另外两个可关断开关器件保持闭锁；或者
    与电容负极直接相连的两个可关断开关器件同时导通，另外两个可关断开关器件保持闭锁；或者
    其中一个可关断开关器件导通，其余可关断开关器件保持闭锁状态。
  4. 根据权利要求1所述的充电控制方法，其中，对全部桥臂中的半桥子模块逐个进行第二旁路，包括：
    第二旁路数量从零开始按照第二速率逐渐连续增加。
  5. 根据权利要求4所述的充电控制方法，其中，第二旁路，包括：
    两端直接与输出端子相连的可关断开关器件导通，另一可关断开关器件保持闭锁。
  6. 根据权利要求1所述的充电控制方法，其中，根据全桥子模块平均电压、半桥子模块平均电压和额定充电电压，动态调整所述第一旁路数量和第二旁路数量，包括：
    根据全桥子模块平均电压与半桥子模块平均电压计算子模块平均电压；
    根据子模块平均电压与额定充电电压的差值动态调整总旁路数量；
    根据全桥子模块平均电压与半桥子模块平均电压计算电压系数；
    根据电压系数和总旁路数量调整第一旁路数量和第二旁路数量。
  7. 根据权利要求6所述的充电控制方法，其中，根据子模块平均电压与额定充电电压的差值动态调整总旁路数量，包括：
    根据所述差值按照第三速率逐步调整所述总旁路数量。
  8. 根据权利要求6所述的充电控制方法，其中，根据全桥子模块平均电压与半桥子模块平均电压计算电压系数，包括：
    按以下公式计算电压系数：
    K＝V1/(V1+V2)，或者
    Figure PCTCN2021108431-appb-100001
    其中，K为电压系数，0＜K≤1，V1为全桥子模块平均电压，V2为半桥子模块平均电压，kp为比例系数，取值范围0-100，k T为积分系数，取值范围0-100。
  9. 根据权利要求8所述的充电控制方法，其中，根据电压系数和总旁路数量调整第一旁路数量和第二旁路数量，包括：
    按照以下公式计算第一旁路数量和第二旁路数量，
    M＝K*Q；
    N＝(1-K)*Q；
    其中，K为电压系数，Q为总旁路数量，M为第一旁路数量，N为第二旁路数量。
  10. 根据权利要求1所述的充电控制方法，其中，所述充电控制方法还包括：
    所述换流器直流端短路状态下，闭合进线开关进入第一充电阶段；
    第一充电阶段稳定后，闭合充电电阻开关进入第二充电阶段。
  11. 根据权利要求10所述的充电控制方法，其中，所述换流器直流端包括：
    输出正直流电压的端子、输出负直流电压的端子、与前述两个端子直接相连的等效端子。
  12. 根据权利要求1所述的充电控制方法，其中，所述第一充电阶段包括：
    所有全桥子模块或半桥子模块的可控关断器件均保持闭锁状态，交流电压通过与所述可控关断器件的反并联二极管给子模块中的电容进行自然充电。
  13. 根据权利要求2、4、7中任一项所述的充电控制方法，其中，所述第一速率、第二速率、第三速率可作为定值整定。
  14. 一种混合型换流器的充电控制装置，包括：
    第一控制模块，用于充电线路上的充电电阻开关闭合后，对全部桥臂中的全桥子模块逐个进行第一旁路，直至所述全桥子模块的第一旁路数量达到第一设定值或全桥子模块平均电压与半桥子模块平均电压相等；
    第二控制模块，当第一旁路数量达到第一设定值且全桥子模块平均电压与半桥子模块平均电压不等时，对全部桥臂中的半桥子模块逐个进行第 二旁路直至所述半桥子模块的第二旁路数量达到第二设定值或全桥子模块平均电压与半桥子模块平均电压相等；
    动态调整模块，用于根据全桥子模块平均电压、半桥子模块平均电压和额定充电电压，动态调整所述第一旁路数量和第二旁路数量；
    动态执行模块，用于全桥子模块平均电压和半桥子模块分别按照动态调整后的第一旁路数量和第二旁路数量执行第一旁路和第二旁路，直至全桥子模块平均电压和半桥子模块平均电压均达到额定电压。
  15. 一种混合型换流器的充电控制电子设备，包括：
    一个或多个处理器；
    存储装置，用于存储一个或多个程序；
    当所述一个或多个程序被所述一个或多个处理器执行，使得所述一个或多个处理器实现如权利要求1-13中任一所述的充电控制方法。
  16. 一种计算机可读介质，其上存储有计算机程序，其中，所述计算机程序被处理器执行时实现如权利要求1-13中任一所述的充电控制方法。
PCT/CN2021/108431 2020-07-31 2021-07-26 混合型换流器的充电控制方法及装置 WO2022022459A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BR112022027056A BR112022027056A2 (pt) 2020-07-31 2021-07-26 Método e aparelho de controle de carga para conversor híbrido
DE112021001765.9T DE112021001765T5 (de) 2020-07-31 2021-07-26 Verfahren und vorrichtung zur ladesteuerung eines hybridkonverters

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202010761895.6 2020-07-31
CN202010761895.6A CN114070107B (zh) 2020-07-31 2020-07-31 混合型换流器的充电控制方法及装置

Publications (1)

Publication Number Publication Date
WO2022022459A1 true WO2022022459A1 (zh) 2022-02-03

Family

ID=80037581

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2021/108431 WO2022022459A1 (zh) 2020-07-31 2021-07-26 混合型换流器的充电控制方法及装置

Country Status (4)

Country Link
CN (1) CN114070107B (zh)
BR (1) BR112022027056A2 (zh)
DE (1) DE112021001765T5 (zh)
WO (1) WO2022022459A1 (zh)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102739030A (zh) * 2012-07-04 2012-10-17 浙江省电力试验研究院技术服务中心 一种全桥型mmc-hvdc的启动方法
CN105119508A (zh) * 2015-09-18 2015-12-02 山东建筑大学 全桥与半桥子模块混联的模块化多电平换流器及启动方法
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
CN106787087A (zh) * 2017-01-09 2017-05-31 许继集团有限公司 混合式mmc排序均压充电方法、启动方法及装置
US20170271997A1 (en) * 2014-12-12 2017-09-21 Abb Schweiz Ag Standby and charging of modular multilevel converters
CN107947618A (zh) * 2017-12-12 2018-04-20 荣信汇科电气技术有限责任公司 基于全半桥混连拓扑的换流阀交流侧可控充电方法
CN108471251A (zh) * 2018-04-27 2018-08-31 广州供电局有限公司 半桥与全桥混合的模块化多电平换流器的启动方法及装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103337972B (zh) * 2013-05-22 2014-06-18 华中科技大学 一种混合型换流器及风力发电系统
CN204669246U (zh) * 2015-06-23 2015-09-23 南京南瑞继保电气有限公司 模块化多电平换流器
CN106452043B (zh) * 2016-12-01 2019-05-07 南京南瑞继保电气有限公司 一种子模块分布式充电方法
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
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
CN110850197B (zh) * 2019-10-22 2021-10-15 中国南方电网有限责任公司超高压输电公司检修试验中心 一种mmc功率模块过压晶闸管旁路试验方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102739030A (zh) * 2012-07-04 2012-10-17 浙江省电力试验研究院技术服务中心 一种全桥型mmc-hvdc的启动方法
US20170271997A1 (en) * 2014-12-12 2017-09-21 Abb Schweiz Ag Standby and charging of modular multilevel converters
CN105119508A (zh) * 2015-09-18 2015-12-02 山东建筑大学 全桥与半桥子模块混联的模块化多电平换流器及启动方法
CN106787087A (zh) * 2017-01-09 2017-05-31 许继集团有限公司 混合式mmc排序均压充电方法、启动方法及装置
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
CN107947618A (zh) * 2017-12-12 2018-04-20 荣信汇科电气技术有限责任公司 基于全半桥混连拓扑的换流阀交流侧可控充电方法
CN108471251A (zh) * 2018-04-27 2018-08-31 广州供电局有限公司 半桥与全桥混合的模块化多电平换流器的启动方法及装置

Also Published As

Publication number Publication date
BR112022027056A2 (pt) 2023-02-07
DE112021001765T5 (de) 2023-01-05
CN114070107B (zh) 2023-08-08
CN114070107A (zh) 2022-02-18

Similar Documents

Publication Publication Date Title
Gao et al. State-of-charge balancing control strategy of battery energy storage system based on modular multilevel converter
Adam et al. Half-and full-bridge modular multilevel converter models for simulations of full-scale HVDC links and multiterminal DC grids
WO2015074529A1 (zh) 一种模块化多电平换流器的子模块电容电压平衡优化方法
WO2014111035A1 (zh) 一种模块化多电平换流器的充电方法
CN111525826B (zh) 一种模块化电容换相换流器和方法
CN110544938B (zh) 一种含电池和超级电容的低压微电网并离网控制方法
Guying et al. Modular multilevel converter for unified power flow controller application
Guo et al. Energy storable VSC-HVDC system based on modular multilevel converter
CN106972541A (zh) 一种基于混合型子模块mmc的配电网多端柔性互联开关
Tian et al. Assessment of low-loss configurations for efficiency improvement in hybrid modular multilevel converters
WO2022022459A1 (zh) 混合型换流器的充电控制方法及装置
Liao et al. Unbalanced voltage/power control in bipolar DC distribution grids using power flow controller
Yang et al. Power quality controller based on hybrid modular multilevel converter
Zhao et al. Energy storage requirements of full-bridge modular multilevel converter with zero sequence voltage injection
Li et al. Improved modular multilevel converter with symmetrical integrated super capacitor energy storage system for electrical energy router application
CN107947611B (zh) 一种应用于柔性直流输电系统的mmc模块拓扑结构
Yu et al. Multi-terminal energy router and its distributed control strategy in micro-grid community applications
JP2015095926A (ja) 電力変換システムおよび電力変換システムの初充電方法
Maharjan et al. Control of a transformerless STATCOM based on the MMCC-SDBC (modular multilevel cascade converter—Single-delta bridge-cells)
Jayasinghe et al. An analysis on the possibility of using capacitors of a three-level capacitor clamped inverter as power smoothing elements for wind power systems
CN207098632U (zh) 一种基于混合型子模块mmc的配电网多端柔性互联开关
Xin et al. AC side fault characteristics analysis of LCC-MMC hybrid HVDC
CN113705144B (zh) 一种考虑闭锁的半桥型mmc电磁暂态仿真方法
CN112421647B (zh) 电力电子虚拟调相机及控制方法
CN113497552B (zh) 一种柔性直流输电系统换流器孤岛启动方法

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: 21849039

Country of ref document: EP

Kind code of ref document: A1

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 112022027056

Country of ref document: BR

ENP Entry into the national phase

Ref document number: 112022027056

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20221229

122 Ep: pct application non-entry in european phase

Ref document number: 21849039

Country of ref document: EP

Kind code of ref document: A1