CN112311274B - Hybrid converter topological structure based on controllable turn-off and control method thereof - Google Patents

Hybrid converter topological structure based on controllable turn-off and control method thereof Download PDF

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Publication number
CN112311274B
CN112311274B CN201910716089.4A CN201910716089A CN112311274B CN 112311274 B CN112311274 B CN 112311274B CN 201910716089 A CN201910716089 A CN 201910716089A CN 112311274 B CN112311274 B CN 112311274B
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China
Prior art keywords
valve
auxiliary
series
bridge arm
topological structure
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CN112311274A (en
Inventor
高冲
汤广福
盛财旺
贺之渊
周建辉
杨俊�
张娟娟
张静
李婷婷
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State Grid Smart Grid Research Institute Co ltd
State Grid Corp of China SGCC
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State Grid Smart Grid Research Institute Co ltd
State Grid Corp of China SGCC
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Priority to CN201910716089.4A priority Critical patent/CN112311274B/en
Priority to PCT/CN2020/099843 priority patent/WO2021022953A1/en
Publication of CN112311274A publication Critical patent/CN112311274A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/75—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/757—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M7/7575—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only for high voltage direct transmission link
    • 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
    • H02M1/06—Circuits specially adapted for rendering non-conductive gas discharge tubes or equivalent semiconductor devices, e.g. thyratrons, thyristors
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/34—Snubber circuits
    • 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
    • H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
    • H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
    • H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/75—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/757—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • 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
    • H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
    • 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
    • H02M1/34—Snubber circuits
    • H02M1/346—Passive non-dissipative snubbers
    • 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
    • H02M1/34—Snubber circuits
    • H02M1/348—Passive dissipative snubbers
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • 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]

Landscapes

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

Abstract

The invention relates to a hybrid converter topological structure based on controllable turn-off and a control method thereof, wherein the topological structure is a three-phase six-bridge-arm circuit which is connected into an alternating current power grid through a converter transformer; the upper bridge arm and the lower bridge arm of each phase of the three-phase six-bridge arm circuit are composed of valve modules; the valve module consists of a main branch and an auxiliary valve which is connected with the main branch in parallel and has the capabilities of controllably switching off forward current and blocking forward and reverse voltage; the main branch consists of a thyristor valve connected in series and a shutoff valve with the capability of controllably shutting off forward current and blocking forward voltage. The topological structure of the hybrid converter provided by the invention fully utilizes the current turn-off characteristic of the turn-off device, can rapidly transfer the commutation current, flexibly control the commutation voltage time area of the thyristor valve, ensures that the thyristor valve has enough reverse recovery time to be reliably turned off, and can fundamentally solve the problem of commutation failure of a direct current system by utilizing the turn-off valve to assist in commutation.

Description

Hybrid converter topological structure based on controllable turn-off and control method thereof
Technical Field
The invention relates to the technical field of current conversion in power electronics, in particular to a topological structure of a hybrid current converter and a control method thereof.
Background
The traditional power grid commutation high-voltage direct current (line commutated converter high voltage direct current, LCC-HVDC) power transmission system has the advantages of long-distance large-capacity power transmission, controllable active power and the like, and is widely applied worldwide. The converter is used as core equipment for direct current transmission, is a core functional unit for realizing alternating current and direct current electric energy conversion, and the operation reliability of the converter determines the operation reliability of an extra-high voltage direct current power grid to a great extent.
Because the traditional converter mostly adopts semi-controlled device thyristors as core components to form a six-pulse bridge converter topology, each bridge arm is formed by connecting multistage thyristors and buffer components thereof in series, and the thyristors do not have self-turn-off capability, the phase conversion failure easily occurs under the condition of AC system faults and the like, so that direct current surge and direct current transmission power rapid and great loss are caused, and more serious challenges are brought to the stable and safe operation of a power grid.
Aiming at the problem of commutation failure of the traditional direct-current transmission, a great deal of researches are carried out by a plurality of students, and various current converter topologies with the function of resisting commutation failure are invented, for example, a capacitor commutation current converter topology (CCC) is invented, and the valve commutation voltage time area is increased through capacitor voltage to ensure the reliable turn-off of the valve commutation voltage time area; based on the basic principle of a capacitor commutation circuit, various topological structures are evolved, and a controllable capacitor module is formed by combining a power electronic switch and a capacitor so as to realize controllable capacitor input and controllable voltage direction; however, the implementation difficulty of the topological structure engineering based on the capacitance commutation is high. The other is that the turn-off device and the thyristors are connected in series to form the hybrid converter, so that each bridge arm of the converter has turn-off capability, and commutation failure is avoided; because the conventional direct current transmission and transmission capacity is large, each bridge arm of the converter bears high voltage and high current, the switchable pipe valve in the topology needs to be realized in a multistage series-parallel connection mode, meanwhile, the switchable pipe valve bears high current for a long time, and bears higher voltage stress when the high current is switched off, and more series stages are needed, so that the technical scheme engineering has higher realization cost and difficulty.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to fully utilize the current turn-off characteristic of the turn-off device, quickly transfer the commutation current, flexibly control the commutation voltage time area of the thyristor valve, ensure that the thyristor valve has enough reverse recovery time to be reliably turned off, and simultaneously utilize the turn-off valve to assist commutation to fundamentally avoid the occurrence of commutation failure problem of a direct current system.
The invention aims at adopting the following technical scheme:
The utility model provides a hybrid converter topological structure based on controllable shutoff, its improvement lies in, the topological structure is six bridge arm circuits of three-phase, six bridge arm circuits of three-phase pass through converter transformer access ac power network;
The upper bridge arm and the lower bridge arm of each phase of the three-phase six-bridge arm circuit are composed of valve modules;
the valve module consists of a main branch and an auxiliary valve which is connected with the main branch in parallel and has the capabilities of controllably switching off forward current and blocking forward and reverse voltage;
The main branch consists of a thyristor valve connected in series and a shutoff valve with the capability of controllably shutting off forward current and blocking forward voltage.
Preferably, the thyristor valve is composed of a plurality of thyristors and a buffer member connected in series or parallel with each thyristor.
Preferably, the shutoff valve consists of 1 or more power modules connected in series and buffer components connected in series or in parallel with each power module;
the power module is composed of one or more of full-control type power electronic devices with reverse voltage blocking capability, or is composed of full-control type power electronic devices without reverse voltage blocking capability and anti-parallel diodes of the full-control type power electronic devices without reverse voltage blocking capability.
Preferably, the shutoff valve is composed of 1 or more first shutoff branches connected in series and buffer components connected in series or in parallel with each first shutoff branch in the 1 or more first shutoff branches connected in series;
The first turn-off branch is formed by connecting a first power module and a second turn-off branch which is connected with the first power module in parallel;
The second turn-off branch consists of a second power module and a capacitor which are connected in series; the first power module and the second power module are composed of one or more of full-control type power electronic devices with reverse voltage blocking capability, or are composed of full-control type power electronic devices without reverse voltage blocking capability and full-control type power electronic devices anti-parallel diodes without reverse voltage blocking capability;
The connection point of the first power module and the second power module and the connection point of the first power module and the capacitor are both external connection points of the shutoff valve or connection points of the first power module and other first shutoff branches in the shutoff valve.
Preferably, the auxiliary valve is composed of a plurality of auxiliary sub-modules connected in series and buffer components connected with each auxiliary sub-module in series or in parallel in the plurality of auxiliary sub-modules connected in series respectively;
The auxiliary sub-module consists of a power module or consists of a power module and a diode connected in series with the power module;
the power module is composed of one or more of full-control type power electronic devices with reverse voltage blocking capability, or is composed of full-control type power electronic devices without reverse voltage blocking capability and anti-parallel diodes of the full-control type power electronic devices without reverse voltage blocking capability.
Preferably, the auxiliary valve is composed of an auxiliary time sequence control branch and a diode branch which are connected in series;
the diode branch consists of a plurality of diodes connected in series in the forward direction and buffer components connected in series or in parallel with each diode in the diodes connected in series in the forward direction;
The auxiliary time sequence control branch consists of a plurality of power modules which are connected in series and buffer components which are connected in series or in parallel with each power module in the plurality of power modules which are connected in series;
the power module is composed of one or more of full-control type power electronic devices with reverse voltage blocking capability, or is composed of full-control type power electronic devices without reverse voltage blocking capability and anti-parallel diodes of the full-control type power electronic devices without reverse voltage blocking capability.
Preferably, the auxiliary valve is composed of a plurality of first power electronic units connected in series;
the first power electronic unit consists of a first auxiliary branch, a buffer component and a second auxiliary branch which are connected in parallel;
The first auxiliary branch and the second auxiliary branch are composed of two groups of auxiliary time sequence control branches which are connected in series in the forward direction;
The auxiliary time sequence control branch consists of a plurality of power modules which are connected in series and buffer components which are connected in series or in parallel with each power module in the plurality of power modules which are connected in series;
The power module consists of one or more of full-control power electronic devices with reverse voltage blocking capability, or consists of full-control power electronic devices without reverse voltage blocking capability and anti-parallel diodes of the full-control power electronic devices without reverse voltage blocking capability;
the connection points of the two groups of auxiliary time sequence control branches of the first auxiliary branch and the connection points of the two groups of auxiliary time sequence control branches of the second auxiliary branch are external connection points of the auxiliary valve or connection points of the auxiliary valve and other first power electronic units in the auxiliary valve.
Preferably, the auxiliary valve is composed of a plurality of second power electronic units connected in series;
The second power electronic unit consists of a third auxiliary branch, an auxiliary time sequence control branch, a buffer component and a fourth auxiliary branch which are connected in parallel;
the third auxiliary branch and the fourth auxiliary branch are composed of two groups of diode branches which are connected in series in the forward direction;
the diode branch consists of a plurality of diodes connected in series in the forward direction and buffer components connected in series or in parallel with each diode in the diodes connected in series in the forward direction;
The auxiliary time sequence control branch consists of a plurality of power modules which are connected in series and buffer components which are connected in series or in parallel with each power module in the plurality of power modules which are connected in series;
The power module consists of one or more of full-control power electronic devices with reverse voltage blocking capability, or consists of full-control power electronic devices without reverse voltage blocking capability and anti-parallel diodes of the full-control power electronic devices without reverse voltage blocking capability;
The connection points of the two groups of diode branches of the third auxiliary branch and the connection points of the two groups of diode branches of the fourth auxiliary branch are the external connection points of the auxiliary valve or the connection points of the auxiliary valve and other second power electronic units in the auxiliary valve.
Further, the buffer component is formed by one or more of a capacitor, a resistance-capacitance loop, a diode, an inductor or a lightning arrester in series or in parallel.
In a method of controlling a hybrid converter topology as described above, the improvement comprising:
Turning on a shutoff valve of an ith bridge arm of the hybrid converter topological structure, turning off an auxiliary valve of the ith bridge arm of the hybrid converter topological structure, and executing the following steps:
step 1: step 2 is executed by conducting a thyristor valve of an ith bridge arm of the topological structure of the hybrid converter;
Step 2: returning to the step 1 after a control period T;
Wherein i is [1,6].
Preferably, when a commutation failure or a short-circuit fault of an ith bridge arm of the hybrid converter topological structure is detected at a time t f, an auxiliary valve of the ith bridge arm is conducted at a time t f+Δt1, and a shutoff valve of the ith bridge arm is turned off at a time t f+Δt2, when a thyristor valve of the ith bridge arm of the hybrid converter topological structure is in a forward blocking state, the auxiliary valve of the ith bridge arm is turned off, after a control period of the t f is ended, a step S1 is executed until the voltage of the hybrid converter topological structure is restored to be stable, the shutoff valve of the ith bridge arm of the hybrid converter topological structure is conducted, and the auxiliary valve of the ith bridge arm of the hybrid converter topological structure is turned off, and the step 1 is executed;
step S1: a thyristor valve of an ith bridge arm of the hybrid converter topological structure is conducted, a shutoff valve of the ith bridge arm of the hybrid converter topological structure is conducted, an auxiliary valve of the ith bridge arm of the hybrid converter topological structure is turned off, and after deltat, step S2 is executed;
Step S2: turning off a shutoff valve of an ith bridge arm of the hybrid converter topological structure, turning on an auxiliary valve of the ith bridge arm of the hybrid converter topological structure, and executing a step S3 when a thyristor valve of the ith bridge arm of the hybrid converter topological structure is in a forward blocking state;
Step S3: turning off an auxiliary valve of an ith bridge arm of the topological structure of the hybrid converter, and returning to the step S1 after deltat' off;
wherein Deltat' off is the time length of the thyristor valve of the ith bridge arm of the hybrid converter topological structure in the control period of executing step 1 to step 2 in the forward blocking state, deltat 1 is the delay time length of the auxiliary valve for switching on the ith bridge arm, deltat 2 is the delay time length of the shutoff valve for switching off the ith bridge arm, deltat is the switching on time length of the shutoff valve, T is a control period, deltat 1＜Δt2, i.e.1, 6.
In a method of controlling a hybrid converter topology as described above, the improvement comprising:
Step T1: a thyristor valve of an ith bridge arm of the hybrid converter topological structure is conducted, a shutoff valve of the ith bridge arm of the hybrid converter topological structure is conducted, an auxiliary valve of the ith bridge arm of the hybrid converter topological structure is turned off, after deltat, a step T2 is executed,
Step T2: turning off a shutoff valve of an ith bridge arm of the hybrid converter topological structure, turning on an auxiliary valve of the ith bridge arm of the hybrid converter topological structure, and executing a step T3 when a thyristor valve of the ith bridge arm of the hybrid converter topological structure is in a forward blocking state;
Step T3: turning off an auxiliary valve of an ith bridge arm of the topological structure of the hybrid converter, and returning to the step T1 after deltat' off;
Wherein Deltat "off is the time length of the thyristor valve of the ith bridge arm of the topological structure of the hybrid converter in a control period in a forward blocking state, deltat is the on time length of the shutoff valve, T is a control period, i.e.1, 6.
Compared with the closest prior art, the invention has the following beneficial effects:
The hybrid converter topology structure based on controllable turn-off is a three-phase six-bridge-arm circuit, and the three-phase six-bridge-arm circuit is connected to an alternating current power grid through a converter transformer; the upper bridge arm and the lower bridge arm of each phase of the three-phase six-bridge arm circuit are composed of valve modules; the valve module consists of a main branch and an auxiliary valve connected with the main branch in parallel; the structure can realize auxiliary commutation of the converter valve, and avoid commutation failure; the auxiliary valve can rapidly transfer phase current and flexibly control the commutation time area of the thyristor valve, the valve current is rapidly transferred to the auxiliary valve after commutation failure occurs, and the commutation between two bridge arms can be rapidly recovered through the characteristic of large-current turn-off of the fully-controlled device, so that the recovery time of the converter after the commutation failure is greatly shortened; the main branch consists of a thyristor valve and a shutoff valve which are connected in series, wherein the shutoff valve can shut off the current of the main branch in advance, and simultaneously provide reverse voltage for the main branch, so that the phase change time area of the thyristor valve of the main branch is increased, the reliable shutoff of the thyristor valve is ensured, the series number of the shutoff valves in the main branch is less, and the total loss is lower;
the hybrid converter topological structure based on controllable turn-off can be put into use with the auxiliary valve at any time, so that the loss of the main branch valve can be effectively reduced, the operation with low voltage and low turn-off angle can be realized, and the reactive power of the inversion side is greatly reduced;
According to the first control method provided by the invention, during normal operation, the auxiliary valve is not put into operation, only voltage stress is needed to be born, and each operation working condition of the converter valve is not negatively influenced; and after the commutation failure fault or the short circuit fault occurs, the auxiliary valve is immediately put into the device, so that the auxiliary commutation function is realized in a short time, and the commutation among the bridge arms is quickly recovered. The technical scheme fully utilizes the advantages of the thyristor and the turn-off device, adopts two branches to be connected in parallel, realizes the transfer of current through the turn-off device by the main branch, bears larger turn-off voltage stress when the auxiliary valve is used for faults, does not need to bear the current stress for a long time, does not increase the loss of the device, improves the utilization rate of the turn-off device, and is convenient for engineering implementation;
The second control mode provided by the invention is a mode of alternately operating the main branch and the auxiliary valve, and the operation mode can avoid failure fault or short circuit fault, thereby being beneficial to improving the overall reliability of the converter.
Drawings
Fig. 1 is a schematic structural diagram of a hybrid converter topology based on controllable shutdown according to the present invention;
Fig. 2 is a schematic structural diagram of a shutdown valve in a hybrid converter topology based on controllable shutdown according to the present invention;
Fig. 3 is a schematic structural diagram of an auxiliary valve in a topology structure of a hybrid converter based on controllable shutdown according to the present invention;
Fig. 4 is a schematic structural diagram of a buffer component in a topology structure of a hybrid converter based on controllable turn-off according to the present invention;
fig. 5 is a current flow path during normal operation of a hybrid converter topology based on controllable shutdown provided by a preferred embodiment of the present invention;
fig. 6 is a control timing diagram of the hybrid converter topology according to the present invention with controllable shutdown during normal operation;
Fig. 7 is a current flow path at the time of a fault of a hybrid converter topology based on controllable shutdown according to the preferred embodiment of the present invention;
Fig. 8 is a control timing diagram of a hybrid converter topology fault based on controllable shutdown provided by the preferred embodiment;
Fig. 9 is a control timing chart when a fault is detected in advance, which is provided by the preferred embodiment of the present invention.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a hybrid converter topology structure based on controllable turn-off, as shown in fig. 1, wherein the topology structure is a three-phase six-bridge arm circuit which is connected into an alternating current power grid through a converter transformer; the upper bridge arm and the lower bridge arm of each phase of the three-phase six-bridge arm circuit are composed of valve modules; the valve module consists of a main branch and an auxiliary valve which is connected with the main branch in parallel and has the capabilities of controllably switching off forward current and blocking forward and reverse voltage; the main branch consists of a thyristor valve connected in series and a shutoff valve with the capabilities of controllably shutting off forward current and blocking forward voltage;
Further, the hybrid converter topology based on controllable shutdown may further include a trigger control system for sending control timing to each valve and auxiliary valve in the main leg.
The thyristor valve consists of a plurality of thyristors and a buffer component connected with each thyristor in series or in parallel.
The turn-off valve is formed by connecting single-stage or multi-stage fully-controlled power electronic devices with at least forward current controllable turn-off and voltage blocking capabilities in series, and the circuit topology structure of the turn-off valve comprises but is not limited to a single-stage, half-bridge or H-bridge topology structure. The shutoff valve is used for shutting off the main branch current and transferring the main branch current to the auxiliary valve.
The structure of the shutoff valve is shown in (a) of fig. 2, and consists of a single or a plurality of power modules connected in series and a buffer component connected in series or in parallel with each power module in the plurality of power modules connected in series;
The power module consists of a full-control type power electronic device and a diode which is antiparallel with the full-control type power electronic device.
The structure of the shutoff valve may also be, as shown in fig. 2 (b), composed of a plurality of first shutoff branches connected in series and a buffer member connected in series or in parallel with each of the plurality of first shutoff branches connected in series;
The first turn-off branch is formed by connecting a first power module and a second turn-off branch which is connected with the first power module in parallel;
the second turn-off branch consists of a second power module and a capacitor which are connected in series;
The first power module and the second power module are both composed of a fully-controlled power electronic device and a diode which is antiparallel with the fully-controlled power electronic device;
The connection point of the first power module and the second power module and the connection point of the first power module and the capacitor are both external connection points of the shutoff valve or connection points of the first power module and other first shutoff branches in the shutoff valve.
Further, the shut-off valve may be replaced by an auxiliary valve.
The auxiliary valve is formed by connecting multiple stages of fully-controlled power electronic devices with at least forward current controllable turn-off and forward and reverse voltage blocking capabilities in series, and the circuit topology structure of the auxiliary valve comprises but is not limited to a single-stage, half-bridge or H-bridge topology structure.
The structure of the auxiliary valve is shown as a in fig. 3, and consists of a plurality of auxiliary sub-modules connected in series and buffer components connected with each auxiliary sub-module in series or in parallel in the plurality of auxiliary sub-modules connected in series respectively;
The auxiliary sub-module consists of a power module and a diode connected in series with the power module;
The power module consists of a full-control type power electronic device and a diode which is antiparallel with the full-control type power electronic device.
The structure of the auxiliary valve is shown as b in fig. 3, and consists of an auxiliary time sequence control branch and a diode branch which are connected in series;
the diode branch consists of a plurality of diodes connected in series in the forward direction and buffer components connected in series or in parallel with each diode in the diodes connected in series in the forward direction;
The auxiliary time sequence control branch consists of a plurality of power modules which are connected in series and buffer components which are connected in series or in parallel with each power module in the plurality of power modules which are connected in series;
The power module consists of a full-control type power electronic device and a diode which is antiparallel with the full-control type power electronic device.
The auxiliary valve is composed of a plurality of first power electronic units connected in series as shown in the structure c of fig. 3;
the first power electronic unit consists of a first auxiliary branch, a buffer component and a second auxiliary branch which are connected in parallel;
The first auxiliary branch and the second auxiliary branch are composed of two groups of auxiliary time sequence control branches which are connected in series in the forward direction;
The auxiliary time sequence control branch consists of a plurality of power modules which are connected in series and buffer components which are connected in series or in parallel with each power module in the plurality of power modules which are connected in series;
the power module consists of a full-control type power electronic device and a diode which is antiparallel with the full-control type power electronic device;
the connection points of the two groups of auxiliary time sequence control branches of the first auxiliary branch and the connection points of the two groups of auxiliary time sequence control branches of the second auxiliary branch are external connection points of the auxiliary valve or connection points of the auxiliary valve and other first power electronic units in the auxiliary valve.
The auxiliary valve is composed of a plurality of second power electronic units connected in series as shown in d of fig. 3;
The second power electronic unit consists of a third auxiliary branch, an auxiliary time sequence control branch, a buffer component and a fourth auxiliary branch which are connected in parallel;
the third auxiliary branch and the fourth auxiliary branch are composed of two groups of diode branches which are connected in series in the forward direction;
the diode branch consists of a plurality of diodes connected in series in the forward direction and buffer components connected in series or in parallel with each diode in the diodes connected in series in the forward direction;
The auxiliary time sequence control branch consists of a plurality of power modules which are connected in series and buffer components which are connected in series or in parallel with each power module in the plurality of power modules which are connected in series;
the power module consists of a full-control type power electronic device and a diode which is antiparallel with the full-control type power electronic device;
further, the reverse-resistance type full-control power electronic device is a full-control power electronic device with reverse voltage blocking capability, so that an anti-parallel diode is not needed in the reverse-resistance type full-control power electronic device in the power module; the fully-controlled power electronic device except for the reverse blocking type is a fully-controlled power electronic device without reverse voltage blocking capability, and thus, the fully-controlled power electronic device except for the reverse blocking type in the power module requires an anti-parallel diode.
The connection points of the two groups of diode branches of the third auxiliary branch and the connection points of the two groups of diode branches of the fourth auxiliary branch are the external connection points of the auxiliary valve or the connection points of the auxiliary valve and other second power electronic units in the auxiliary valve.
The fully controlled power electronic device is composed of one or more of IGBT, IGCT, IEGT, GTO or MOSFET and other turn-off devices.
As shown in fig. 4, the buffer member is composed of one or more of a capacitor, a resistive-capacitive loop, a diode, an inductor, or a lightning arrester connected in series or in parallel.
A control method of the hybrid converter topology structure based on controllable shutdown as described above, comprising:
during normal operation, a shutoff valve of an ith bridge arm of the hybrid current converter topological structure based on controllable shutoff is conducted, an auxiliary valve of the ith bridge arm of the hybrid current converter topological structure based on controllable shutoff is turned off, and the following steps are executed:
step 1: step 2 is executed by conducting a thyristor valve of an ith bridge arm based on a controllable turn-off hybrid converter topological structure;
Step 2: after a control period T, the process returns to step 1.
As shown in fig. 5, in normal operation, the valve current flows through the path, the main branch is periodically subjected to voltage and current stress, and the auxiliary valve is always in an off state; as shown in fig. 6, the control timing of each valve in normal operation is shown, where Sg1 is the control timing of the thyristor valve, sg12 is the control timing of the shutoff valve, sg13 is the control timing of the auxiliary valve, T 0 is the initial trigger timing, Δt on is the on time of the thyristor valve, Δt off is the off time of the thyristor valve, Δt' off is the forward blocking time of the thyristor valve, and the control period T is 2pi.
When the occurrence of commutation failure or short-circuit fault of the ith bridge arm based on the controllable shutdown hybrid converter topological structure is detected at the time t f, the auxiliary valve of the ith bridge arm is conducted at the time t f+Δt1, and the shutoff valve of the ith bridge arm is turned off at the time t f+Δt2, and when the thyristor valve of the ith bridge arm based on the controllable shutdown hybrid converter topological structure is in a forward blocking state, the auxiliary valve of the ith bridge arm is turned off, and the process is divided into three stages, as shown in fig. 7, wherein the stage is a main-branch auxiliary valve commutation stage, the auxiliary valve receives a trigger signal to conduct, and then the shutoff valve of the main branch receives a signal to turn off, so that the main-branch auxiliary valve commutation process is completed; in fig. 7 b, the main branch is turned off to the auxiliary valve through-flow stage, in which the main branch is completely turned off, and the current is completely transferred to the auxiliary valve; fig. 7 c shows the main branch and auxiliary valve shut-off phase, in which the auxiliary valve receives a shut-off signal to shut off the auxiliary valve, and the thyristor valve is in a forward blocking state for receiving a forward voltage. As shown in fig. 8, in order to detect the control timing of each phase-change failure or short-circuit failure, where Sg1 is the control timing of the thyristor valve, sg12 is the control timing of the shutoff valve, sg13 is the control timing of the auxiliary valve, T 1 is the initial trigger timing, the control period T is 2pi, Δt 1 is the delay time for turning on the auxiliary valve of the ith bridge arm, Δt 2 is the delay time for turning off the shutoff valve of the ith bridge arm, T f+Δt1＜tf+Δt2,Δt3 is the on time of the auxiliary valve, and in fig. 8, the time from zero crossing of the main shunt current to the shutoff of the auxiliary valve is the time Δt off,Δtoff for turning off the thyristor valve is greater than the minimum preset off time.
When the control period of t f is over, executing step S1 until the voltage of the hybrid converter topology structure based on controllable shutdown is recovered to be stable, switching on a shutoff valve of an ith bridge arm of the hybrid converter topology structure based on controllable shutdown, switching off an auxiliary valve of the ith bridge arm of the hybrid converter topology structure based on controllable shutdown, and executing step 1;
Step S1: the thyristor valve of the ith bridge arm based on the controllable turn-off hybrid converter topological structure is conducted, the shutoff valve of the ith bridge arm based on the controllable turn-off hybrid converter topological structure is conducted, the auxiliary valve of the ith bridge arm based on the controllable turn-off hybrid converter topological structure is turned off, after deltat, the step S2 is executed,
Step S2: turning off a shutoff valve of an ith bridge arm of the hybrid converter topology structure based on controllable shutoff, turning on an auxiliary valve of the ith bridge arm of the hybrid converter topology structure based on controllable shutoff, and executing step S3 when a thyristor valve of the ith bridge arm of the hybrid converter topology structure based on controllable shutoff is in a forward blocking state;
Step S3: turning off an auxiliary valve of an ith bridge arm based on a controllable turn-off hybrid converter topological structure, and returning to the step S1 after deltat' off;
The Δt' off is a time length of the thyristor valve of the ith bridge arm of the hybrid converter topology based on controllable turn-off in one control period of executing the steps 1 to 2 in a forward blocking state.
The invention also provides another control method for the hybrid current converter topological structure based on the controllable turn-off, which is used for executing the following steps when the i-th bridge arm of the hybrid current converter topological structure based on the controllable turn-off is detected to be in phase change failure or short circuit failure in advance and the i-th bridge arm is in phase change to the j-th bridge arm:
Step T1: the thyristor valve of the ith bridge arm based on the controllable turn-off hybrid converter topological structure is conducted, the shutoff valve of the ith bridge arm based on the controllable turn-off hybrid converter topological structure is conducted, the auxiliary valve of the ith bridge arm based on the controllable turn-off hybrid converter topological structure is turned off, after deltat, the step T2 is executed,
Step T2: turning off a shutoff valve of an ith bridge arm of the hybrid converter topology structure based on controllable shutoff, turning on an auxiliary valve of the ith bridge arm of the hybrid converter topology structure based on controllable shutoff, and executing a step T3 when a thyristor valve of the ith bridge arm of the hybrid converter topology structure based on controllable shutoff is in a forward blocking state;
Step T3: turning off an auxiliary valve of an ith bridge arm based on a controllable turn-off hybrid converter topological structure, and returning to the step T1 after deltat' off is passed;
the delta T off is the time length of the thyristor valve of the ith bridge arm of the hybrid converter topological structure based on controllable turn-off in one control period in a forward blocking state, and the T is one control period.
As shown in fig. 9, the control timing of each valve when a failure is detected in advance is where Sg1 is the control timing of the thyristor valve, sg12 is the control timing of the shutoff valve, sg13 is the control timing of the auxiliary valve, Δt on is the on time of the thyristor valve, Δt "off is the forward blocking time of the thyristor valve, the control period T is 2pi, Δt is the on time of the shutoff valve,And delta t13 is the conduction duration of the auxiliary valve, and the time from zero crossing of the main shunt current to the closing of the auxiliary valve is the closing time delta t off,Δtoff of the thyristor valve and is larger than the minimum preset closing time. When the commutation failure is predicted to occur, the operation mode is started, the commutation failure can be successfully avoided, meanwhile, the low-turn-off angle operation can be realized, and the reactive power of the inversion side is effectively reduced.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.

Claims (10)

1. The topological structure is a three-phase six-bridge-arm circuit, and the three-phase six-bridge-arm circuit is connected into an alternating current power grid through a converter transformer;
The upper bridge arm and the lower bridge arm of each phase of the three-phase six-bridge arm circuit are composed of valve modules;
the valve module consists of a main branch and an auxiliary valve which is connected with the main branch in parallel and has the capabilities of controllably switching off forward current and blocking forward and reverse voltage;
the main branch consists of a thyristor valve connected in series and a shutoff valve with the capabilities of controllably shutting off forward current and blocking forward voltage;
The auxiliary valve consists of an auxiliary time sequence control branch and a diode branch which are connected in series;
the diode branch consists of a plurality of diodes connected in series in the forward direction and buffer components connected in series or in parallel with each diode in the diodes connected in series in the forward direction;
The auxiliary time sequence control branch consists of a plurality of power modules which are connected in series and buffer components which are connected in series or in parallel with each power module in the plurality of power modules which are connected in series;
the power module is composed of one or more of full-control type power electronic devices with reverse voltage blocking capability, or is composed of full-control type power electronic devices without reverse voltage blocking capability and anti-parallel diodes of the full-control type power electronic devices without reverse voltage blocking capability.
2. The topology of claim 1, wherein said thyristor valve is comprised of a plurality of thyristors and buffer components in series or parallel with each thyristor.
3. The topology of claim 1, wherein said shutoff valve is comprised of 1 or more power modules in series and a buffer member in series or parallel with each power module;
the power module is composed of one or more of full-control type power electronic devices with reverse voltage blocking capability, or is composed of full-control type power electronic devices without reverse voltage blocking capability and anti-parallel diodes of the full-control type power electronic devices without reverse voltage blocking capability.
4. The topology of claim 1, wherein said shutoff valve is comprised of 1 or more first shutoff branches in series and a buffer member in series or parallel with each of said 1 or more first shutoff branches in series;
The first turn-off branch is formed by connecting a first power module and a second turn-off branch which is connected with the first power module in parallel;
The second turn-off branch consists of a second power module and a capacitor which are connected in series; the first power module and the second power module are composed of one or more of full-control type power electronic devices with reverse voltage blocking capability, or are composed of full-control type power electronic devices without reverse voltage blocking capability and full-control type power electronic devices anti-parallel diodes without reverse voltage blocking capability;
The connection point of the first power module and the second power module and the connection point of the first power module and the capacitor are both external connection points of the shutoff valve or connection points of the first power module and other first shutoff branches in the shutoff valve.
5. The topology of claim 1, wherein said auxiliary valve is comprised of a plurality of auxiliary sub-modules in series and a buffer member in series or parallel with each of said plurality of auxiliary sub-modules in series, respectively;
The auxiliary sub-module consists of a power module or consists of a power module and a diode connected in series with the power module;
the power module is composed of one or more of full-control type power electronic devices with reverse voltage blocking capability, or is composed of full-control type power electronic devices without reverse voltage blocking capability and anti-parallel diodes of the full-control type power electronic devices without reverse voltage blocking capability.
6. The topology of claim 1, wherein said auxiliary valve is comprised of a plurality of first power electronics units in series;
the first power electronic unit consists of a first auxiliary branch, a buffer component and a second auxiliary branch which are connected in parallel;
The first auxiliary branch and the second auxiliary branch are composed of two groups of auxiliary time sequence control branches which are connected in series in the forward direction;
The auxiliary time sequence control branch consists of a plurality of power modules which are connected in series and buffer components which are connected in series or in parallel with each power module in the plurality of power modules which are connected in series;
The power module consists of one or more of full-control power electronic devices with reverse voltage blocking capability, or consists of full-control power electronic devices without reverse voltage blocking capability and anti-parallel diodes of the full-control power electronic devices without reverse voltage blocking capability;
the connection points of the two groups of auxiliary time sequence control branches of the first auxiliary branch and the connection points of the two groups of auxiliary time sequence control branches of the second auxiliary branch are external connection points of the auxiliary valve or connection points of the auxiliary valve and other first power electronic units in the auxiliary valve.
7. The topology of claim 1, wherein said auxiliary valve is comprised of a plurality of second power electronics units in series;
The second power electronic unit consists of a third auxiliary branch, an auxiliary time sequence control branch, a buffer component and a fourth auxiliary branch which are connected in parallel;
the third auxiliary branch and the fourth auxiliary branch are composed of two groups of diode branches which are connected in series in the forward direction;
the diode branch consists of a plurality of diodes connected in series in the forward direction and buffer components connected in series or in parallel with each diode in the diodes connected in series in the forward direction;
The auxiliary time sequence control branch consists of a plurality of power modules which are connected in series and buffer components which are connected in series or in parallel with each power module in the plurality of power modules which are connected in series;
The power module consists of one or more of full-control power electronic devices with reverse voltage blocking capability, or consists of full-control power electronic devices without reverse voltage blocking capability and anti-parallel diodes of the full-control power electronic devices without reverse voltage blocking capability;
The connection points of the two groups of diode branches of the third auxiliary branch and the connection points of the two groups of diode branches of the fourth auxiliary branch are the external connection points of the auxiliary valve or the connection points of the auxiliary valve and other second power electronic units in the auxiliary valve.
8. The topology of any of claims 2-7, wherein said buffer component is comprised of one or more of a capacitor, a resistive-capacitive loop, a diode, an inductor, or a lightning arrester in series or parallel.
9. A method of controlling a hybrid converter topology according to any of claims 1-7, characterized in that the method comprises:
Turning on a shutoff valve of an ith bridge arm of the hybrid converter topological structure, turning off an auxiliary valve of the ith bridge arm of the hybrid converter topological structure, and executing the following steps:
step 1: step 2 is executed by conducting a thyristor valve of an ith bridge arm of the topological structure of the hybrid converter;
Step 2: returning to the step 1 after a control period T;
Wherein i is [1,6];
When the occurrence of commutation failure or short-circuit fault of the ith bridge arm of the hybrid converter topological structure is detected at the moment t f, the auxiliary valve of the ith bridge arm is conducted at the moment t f+Δt1, the shutoff valve of the ith bridge arm is turned off at the moment t f+Δt2, when the thyristor valve of the ith bridge arm of the hybrid converter topological structure is in a forward blocking state, the auxiliary valve of the ith bridge arm is turned off, when the control period of the t f is ended, the step S1 is executed until the voltage of the hybrid converter topological structure is stable, the shutoff valve of the ith bridge arm of the hybrid converter topological structure is conducted, the auxiliary valve of the ith bridge arm of the hybrid converter topological structure is turned off, and the step 1 is executed;
step S1: a thyristor valve of an ith bridge arm of the hybrid converter topological structure is conducted, a shutoff valve of the ith bridge arm of the hybrid converter topological structure is conducted, an auxiliary valve of the ith bridge arm of the hybrid converter topological structure is turned off, and after deltat, step S2 is executed;
Step S2: turning off a shutoff valve of an ith bridge arm of the hybrid converter topological structure, turning on an auxiliary valve of the ith bridge arm of the hybrid converter topological structure, and executing a step S3 when a thyristor valve of the ith bridge arm of the hybrid converter topological structure is in a forward blocking state;
Step S3: turning off an auxiliary valve of an ith bridge arm of the topological structure of the hybrid converter, and returning to the step S1 after deltat' off;
Wherein Δt' off is the time length of the thyristor valve of the ith bridge arm of the hybrid converter topology in the execution of one control period from step 1 to step 2 in the forward blocking state, Δt 1 is the delay time length of the auxiliary valve for turning on the ith bridge arm, Δt 2 is the delay time length of the turn-off valve for turning off the ith bridge arm, Δt is the turn-on time length of the turn-off valve, 0< Δt < T/3, T is one control period, Δt 1<Δt2, i e [1,6].
10. A method of controlling a hybrid converter topology according to any of claims 1-7, characterized in that the method comprises:
step T1: switching on a thyristor valve of an ith bridge arm of the hybrid converter topological structure, switching on a shutoff valve of the ith bridge arm of the hybrid converter topological structure, switching off an auxiliary valve of the ith bridge arm of the hybrid converter topological structure, and executing a step T2 after delta T, wherein 0< delta T < T/3;
Step T2: turning off a shutoff valve of an ith bridge arm of the hybrid converter topological structure, turning on an auxiliary valve of the ith bridge arm of the hybrid converter topological structure, and executing a step T3 when a thyristor valve of the ith bridge arm of the hybrid converter topological structure is in a forward blocking state;
Step T3: turning off an auxiliary valve of an ith bridge arm of the topological structure of the hybrid converter, and returning to the step T1 after passing through delta T' off;
Wherein Deltat' off is the time length of the thyristor valve of the ith bridge arm of the hybrid converter topological structure in the forward blocking state in one control period, deltat is the on time length of the shutoff valve, 0< Deltat < T/3, T is one control period, i epsilon [1,6].
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