CN112311274A - 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
CN112311274A
CN112311274A CN201910716089.4A CN201910716089A CN112311274A CN 112311274 A CN112311274 A CN 112311274A CN 201910716089 A CN201910716089 A CN 201910716089A CN 112311274 A CN112311274 A CN 112311274A
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valve
auxiliary
series
bridge arm
hybrid converter
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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 Corp of China SGCC
Global Energy Interconnection Research Institute
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State Grid Corp of China SGCC
Global Energy Interconnection Research Institute
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Priority to CN201910716089.4A priority Critical patent/CN112311274A/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]

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-leg circuit which 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 both 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 turning off forward current and blocking forward and reverse voltage; the main branch consists of a thyristor valve and a shutoff valve which are connected in series and have the capabilities of controllably shutting off forward current and blocking forward voltage. The hybrid converter topological structure provided by the invention fully utilizes the current turn-off characteristic of the turn-off device, can quickly transfer phase-change current, flexibly control the time area of the phase-change voltage of the thyristor valve, ensure that the thyristor valve has enough reverse recovery time and is reliably turned off, and simultaneously utilize the turn-off valve to assist phase change to fundamentally solve the problem of phase change failure of a direct-current system.

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 phase-change 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 in the world. The converter is used as core equipment of direct current transmission, is a core function 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 thyristor does not have the self-turn-off capability, phase change failure is easy to occur under the conditions of AC system failure and the like, so that the direct current is increased suddenly and a large amount of direct current transmission power is lost rapidly, and more serious challenge is brought to the stable and safe operation of a power grid.
Aiming at the problem of phase change failure of traditional direct current transmission, a lot of researchers have done a lot of research work, and invent various converter topological structures with the function of resisting the phase change failure, for example, one is a capacitor phase change converter topology (CCC), and the valve phase change voltage time area is increased through capacitor voltage to ensure the reliable turn-off of the converter topology; various topological structures are evolved based on the basic principle of a capacitance phase-changing circuit, and a controllable capacitance module is formed by combining a power electronic switch and a capacitor to realize capacitance input and voltage direction controllability; however, the above topology engineering based on capacitive commutation has a high difficulty. The other is that a turn-off device is connected with a thyristor in series to form a hybrid converter, so that each bridge arm of the converter has turn-off capability, and the occurrence of phase change failure is avoided; because the conventional direct-current transmission has large transmission capacity, each bridge arm of the converter bears high voltage and heavy current, the pipe valve capable of being turned off in the topology is realized in a multi-stage series-parallel connection mode, and meanwhile, the pipe valve capable of being turned off bears the heavy current for a long time, bears higher voltage stress when the heavy current is turned off, and needs more series stages, so the engineering realization cost and difficulty of the technical scheme are higher.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to make full use of the current turn-off characteristic of a turn-off device, quickly transfer phase-change current, flexibly control the time area of phase-change voltage of a thyristor valve, ensure that the thyristor valve has enough reverse recovery time and is reliably turned off, and simultaneously utilize a turn-off valve to assist phase change to fundamentally avoid the problem of phase change failure of a direct-current system.
The purpose of the invention is realized by adopting the following technical scheme:
the hybrid converter topological structure based on controllable turn-off is improved in that the topological structure is a three-phase six-leg circuit, and the three-phase six-leg 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 both 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 turning off forward current and blocking forward and reverse voltage;
the main branch consists of a thyristor valve and a shutoff valve which are connected in series and have the capabilities 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 in parallel with each thyristor.
Preferably, the shut-off valve consists of 1 or more power modules connected in series and a buffer component connected in series or in parallel with each power module;
the power module is composed of one or more of fully-controlled power electronic devices with reverse voltage blocking capability, or is composed of fully-controlled power electronic devices without reverse voltage blocking capability and diodes which are connected with the fully-controlled power electronic devices without reverse voltage blocking capability in an anti-parallel mode.
Preferably, the shut-off valve is composed of 1 or more first shut-off branches connected in series and a buffer component connected in series or in parallel with each of the 1 or more first shut-off branches;
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 one or more of fully-controlled power electronic devices with reverse voltage blocking capability, or composed of fully-controlled power electronic devices without reverse voltage blocking capability and diodes connected in anti-parallel with the fully-controlled power electronic devices 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 shut-off valve or connection points of other first shut-off branches in the shut-off valve.
Preferably, the auxiliary valve is composed of a plurality of auxiliary sub-modules connected in series and a buffer component connected in series or in parallel with each of 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 with the power module in series;
the power module is composed of one or more of fully-controlled power electronic devices with reverse voltage blocking capability, or is composed of fully-controlled power electronic devices without reverse voltage blocking capability and diodes which are connected with the fully-controlled power electronic devices without reverse voltage blocking capability in an anti-parallel mode.
Preferably, the auxiliary valve consists of an auxiliary timing control branch and a diode branch which are connected in series;
the diode branch circuit consists of a plurality of diodes which are connected in series in the forward direction and a buffer component which is connected in series or in parallel with each diode in the plurality of diodes which are connected in series in the forward direction;
the auxiliary time sequence control branch consists of 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 is composed of one or more of fully-controlled power electronic devices with reverse voltage blocking capability, or is composed of fully-controlled power electronic devices without reverse voltage blocking capability and diodes which are connected with the fully-controlled power electronic devices without reverse voltage blocking capability in an anti-parallel mode.
Preferably, said 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 sequential control branches which are connected in series in the forward direction;
the auxiliary time sequence control branch consists of 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 is composed of one or more of fully-controlled power electronic devices with reverse voltage blocking capability, or is composed of fully-controlled power electronic devices without reverse voltage blocking capability and diodes which are connected with the fully-controlled power electronic devices without reverse voltage blocking capability in an anti-parallel mode;
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 both external connection points of the auxiliary valve or connection points of 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 circuit consists of a plurality of diodes which are connected in series in the forward direction and a buffer component which is connected in series or in parallel with each diode in the plurality of diodes which are connected in series in the forward direction;
the auxiliary time sequence control branch consists of 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 is composed of one or more of fully-controlled power electronic devices with reverse voltage blocking capability, or is composed of fully-controlled power electronic devices without reverse voltage blocking capability and diodes which are connected with the fully-controlled power electronic devices without reverse voltage blocking capability in an anti-parallel mode;
the connection points of the two diode branches of the third auxiliary branch and the connection points of the two diode branches of the fourth auxiliary branch are both external connection points of the auxiliary valve or connection points of the auxiliary valve and other second power electronic units in the auxiliary valve.
Further, the buffer component is composed of one or more of a capacitor, a resistance-capacitance loop, a diode, an inductor or an arrester which are connected in series or in parallel.
In a method of controlling a hybrid converter topology as described above, the improvement comprising:
switching on a shutoff valve of the ith bridge arm of the hybrid converter topology, switching off an auxiliary valve of the ith bridge arm of the hybrid converter topology, and executing the following steps:
step 1: conducting a thyristor valve of the ith bridge arm of the topological structure of the hybrid converter, and executing the step 2;
step 2: returning to the step 1 after a control period T;
wherein i ∈ [1,6 ].
Preferably, when at tfWhen detecting that the ith bridge arm of the topological structure of the hybrid converter has phase commutation failure or short-circuit fault at any moment, at tf+Δt1Switching on the auxiliary valve of the i-th arm at a time and at tf+Δt2The method comprises the steps of closing a shutoff valve of the ith bridge arm at any time, closing an auxiliary valve of the ith bridge arm when a thyristor valve of the ith bridge arm of the hybrid converter topology is in a forward blocking state, and closing the auxiliary valve of the ith bridge arm when t isfAfter the control period is over, executing step S1, until the voltage of the hybrid converter topology is restored to be stable, turning on the shutoff valve of the ith bridge arm of the hybrid converter topology, turning off the auxiliary valve of the ith bridge arm of the hybrid converter topology, and executing step 1;
step S1: conducting a thyristor valve of the ith bridge arm of the hybrid converter topology, conducting a shutoff valve of the ith bridge arm of the hybrid converter topology, shutting off an auxiliary valve of the ith bridge arm of the hybrid converter topology, and executing step S2 after a delta t;
step S2: turning off a shutoff valve of the ith bridge arm of the hybrid converter topology, turning on an auxiliary valve of the ith bridge arm of the hybrid converter topology, and executing the step S3 when a thyristor valve of the ith bridge arm of the hybrid converter topology is in a forward blocking state;
step S3: turning off an auxiliary valve of the ith bridge arm of the hybrid converter topology and passing through delta t'offThen, the process returns to step S1;
wherein, delta t'offThe time length of the thyristor valve of the ith bridge arm of the hybrid converter topology in the forward blocking state in order to execute the step 1 to the step 2 within one control period, delta t1Delay duration, Δ t, for switching on the auxiliary valve of the ith bridge arm2The delay time for switching off the shutoff valve of the ith bridge arm, at is the conduction time of the shutoff valve,
Figure BDA0002154280670000041
t is a control period, Δ T1＜Δt2，i∈[1,6]。
In a method of controlling a hybrid converter topology as described above, the improvement comprising:
step T1: switching on a thyristor valve of the ith arm of the hybrid converter topology, switching on a shutoff valve of the ith arm of the hybrid converter topology, switching off an auxiliary valve of the ith arm of the hybrid converter topology, executing a step T2 after a time of delta T,
Figure BDA0002154280670000051
step T2: turning off a shutoff valve of the ith bridge arm of the hybrid converter topology, turning on an auxiliary valve of the ith bridge arm of the hybrid converter topology, and executing the step T3 when a thyristor valve of the ith bridge arm of the hybrid converter topology is in a forward blocking state;
step T3: the auxiliary valve of the ith bridge arm of the hybrid converter topological structure is turned off and passes through delta t ″offThen, returning to the step T1;
wherein, Δ t ″)offThe time length of a thyristor valve of the ith bridge arm of the topological structure of the hybrid converter in a control period in a forward blocking state is shown, delta t is the conduction time length of a closable valve,
Figure BDA0002154280670000052
t is a control period, i belongs to [1,6]]。
Compared with the closest prior art, the invention has the following beneficial effects:
the hybrid converter topological structure based on controllable turn-off is a three-phase six-leg circuit, and the three-phase six-leg 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 both 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 the auxiliary commutation of the converter valve and avoid the commutation failure; the auxiliary valve can quickly transfer phase current and flexibly control the phase change time area of the thyristor valve, the valve current is quickly transferred to the auxiliary valve after the phase change failure occurs, the phase change between two bridge arms can be quickly recovered through the characteristic of high-current turn-off of a fully-controlled device, and the recovery time of the converter after the phase change failure is greatly shortened; the main branch consists of a thyristor valve and a turn-off valve which are connected in series, wherein the turn-off valve can turn off the current of the main branch in advance and 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 turn-off of the thyristor valve is ensured, the number of series stages of the turn-off valve in the main branch is small, and the total loss is low;
the hybrid converter topological structure based on controllable turn-off can be put into use of the auxiliary valve at any time, can effectively reduce the loss of the main branch valve, can realize low-voltage and low-turn-off angle operation, and greatly reduces the reactive power of an inversion side;
according to the first control method provided by the invention, when the converter valve normally operates, the auxiliary valve is not put into operation, only voltage stress is needed to be borne, and negative effects on each operation condition of the converter valve are avoided; and after a commutation failure fault or a short-circuit fault occurs, the auxiliary valve is immediately switched in, an auxiliary commutation function is realized in a short time, and commutation among bridge arms is quickly recovered. The technical scheme fully utilizes the advantages of the thyristor and the turn-off device, adopts two branches connected in parallel, realizes the current transfer of the main branch through the turn-off device, and the auxiliary valve is used for bearing larger turn-off voltage stress when in failure, does not need to bear 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 the occurrence of failure fault or short-circuit fault and is 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 turn-off according to the present invention;
fig. 2 is a schematic structural diagram of a shut-off valve in a hybrid converter topology based on controllable shut-off according to the present invention;
fig. 3 is a schematic structural diagram of an auxiliary valve in a hybrid converter topology based on controllable turn-off according to the present invention;
fig. 4 is a schematic structural diagram of a buffer component in a hybrid converter topology based on controllable turn-off according to the present invention;
fig. 5 is a current flow path during normal operation of the hybrid converter topology based on controllable turn-off according to the preferred embodiment of the present invention;
fig. 6 is a control timing chart of the hybrid converter topology based on controllable turn-off according to the preferred embodiment of the present invention during normal operation;
fig. 7 is a current flow path when the hybrid converter topology based on controllable turn-off provided by the preferred embodiment of the invention fails;
fig. 8 is a control timing diagram of the hybrid converter topology based on controllable turn-off according to the preferred embodiment;
fig. 9 is a control timing chart when a failure is detected in advance, which is provided by the preferred embodiment of the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a hybrid converter topological structure based on controllable turn-off, as shown in fig. 1, the topological structure is a three-phase six-leg circuit, and the three-phase six-leg 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 both 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 turning off forward current and blocking forward and reverse voltage; the main branch consists of a thyristor valve and a shutoff valve which are connected in series and have the capabilities of controllably shutting off forward current and blocking forward voltage;
further, the hybrid converter topology based on controllable turn-off may further include a trigger control system for sending control timing to each valve and auxiliary valve in the main branch.
The thyristor valve is composed of a plurality of thyristors and a buffer component which is connected with each thyristor in the plurality of thyristors in series or in parallel.
The shut-off valve is composed of a single-stage or multi-stage series connection of fully-controlled power electronic devices at least having forward current controllable shut-off and voltage blocking capabilities, and the circuit topology of the shut-off valve includes but is not limited to a single-stage, half-bridge or H-bridge topology. 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) in 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 is composed of a fully-controlled power electronic device and a diode connected with the fully-controlled power electronic device in an anti-parallel mode.
The structure of the shut-off valve may also be, as shown in fig. 2 (b), composed of a plurality of first shut-off branches connected in series and a buffer component connected in series or in parallel with each of the plurality of first shut-off branches;
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 connected with the fully-controlled power electronic device in an anti-parallel mode;
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 shut-off valve or connection points of other first shut-off branches in the shut-off valve.
Further, the shut-off valve may be replaced by an auxiliary valve.
The auxiliary valve is formed by connecting a plurality of stages of fully-controlled power electronic devices which at least have forward current controllable turn-off and forward and reverse voltage blocking capabilities in series, and the circuit topology of the auxiliary valve comprises but is not limited to a single-stage, half-bridge or H-bridge topology.
The structure of the auxiliary valve is shown as a in fig. 3, and the auxiliary valve is composed of a plurality of auxiliary sub-modules connected in series and buffer components connected in series or in parallel with each of the plurality of auxiliary sub-modules connected in series;
the auxiliary sub-module consists of a power module and a diode connected with the power module in series;
the power module is composed of a fully-controlled power electronic device and a diode connected with the fully-controlled power electronic device in an anti-parallel mode.
The structure of the auxiliary valve is shown as b in fig. 3, and consists of an auxiliary timing control branch and a diode branch which are connected in series;
the diode branch circuit consists of a plurality of diodes which are connected in series in the forward direction and a buffer component which is connected in series or in parallel with each diode in the plurality of diodes which are connected in series in the forward direction;
the auxiliary time sequence control branch consists of 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 is composed of a fully-controlled power electronic device and a diode connected with the fully-controlled power electronic device in an anti-parallel mode.
The structure of the auxiliary valve is as shown in c in fig. 3, and the auxiliary valve is formed by connecting a plurality of first power electronic 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 sequential control branches which are connected in series in the forward direction;
the auxiliary time sequence control branch consists of 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 fully-controlled power electronic device and a diode which is connected with the fully-controlled power electronic device in an anti-parallel mode;
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 both external connection points of the auxiliary valve or connection points of other first power electronic units in the auxiliary valve.
The structure of the auxiliary valve is shown as d in fig. 3 and is formed by connecting a plurality of second power electronic 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 circuit consists of a plurality of diodes which are connected in series in the forward direction and a buffer component which is connected in series or in parallel with each diode in the plurality of diodes which are connected in series in the forward direction;
the auxiliary time sequence control branch consists of 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 fully-controlled power electronic device and a diode which is connected with the fully-controlled power electronic device in an anti-parallel mode;
furthermore, the reverse-resistance type full-control power electronic device is a full-control power electronic device with reverse voltage blocking capability, so that the reverse-resistance type full-control power electronic device in the power module does not need an anti-parallel diode; the fully-controlled power electronic devices except the reverse blocking type are fully-controlled power electronic devices without reverse voltage blocking capability, so that the fully-controlled power electronic devices except the reverse blocking type in the power module need anti-parallel diodes.
The connection points of the two diode branches of the third auxiliary branch and the connection points of the two diode branches of the fourth auxiliary branch are both external connection points of the auxiliary valve or 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 component is composed of one or more of a capacitor, a resistance-capacitance loop, a diode, an inductor or an arrester connected in series or in parallel.
A method for controlling a hybrid converter topology based on controllable turn-off as described above, comprising:
when the hybrid converter is in normal operation, the turn-off valve of the ith bridge arm of the hybrid converter topological structure based on controllable turn-off is turned on, the auxiliary valve of the ith bridge arm of the hybrid converter topological structure based on controllable turn-off is turned off, and the following steps are executed:
step 1: switching on a thyristor valve of the ith bridge arm of the hybrid converter topology structure based on controllable turn-off, and executing the step 2;
step 2: and returning to the step 1 after a control period T.
As shown in fig. 5, in order to provide a path for the valve current to flow during normal operation, the main branch is periodically subjected to voltage and current stresses, and the auxiliary valve is always in an off state; as shown in fig. 6, the control timing sequence of each valve in normal operation is shown, wherein Sg1 is the control timing sequence of the thyristor valve, Sg12 is the control timing sequence of the turn-off valve, Sg13 is the control timing sequence of the auxiliary valve, and t is the control timing sequence of the auxiliary valve0For the initial triggering moment, Δ tonFor the conduction time of the thyristor valve, Δ toffIs the turn-off time of the thyristor valve, delta t'offThe control period T is 2 pi for the forward blocking time of the thyristor valve.
When at tfWhen detecting that the ith bridge arm of the hybrid converter topological structure based on controllable turn-off has phase change failure or short-circuit fault at any moment, at tf+Δt1Switching on the auxiliary valve of the i-th arm at a time and at tf+Δt2The method comprises the steps that a shut-off valve of an ith bridge arm is shut off at any time, when a thyristor valve of the ith bridge arm of a hybrid converter topology structure based on controllable shut-off is in a forward block state, an auxiliary valve of the ith bridge arm is shut off, as shown in fig. 7, the process is divided into three stages, wherein a in fig. 7 is a stage that a main branch conducts to the auxiliary valve, the auxiliary valve receives a trigger signal to conduct at the stage, and the main branch conducts to the auxiliary valve after the shut-off valve of the main branch receives a signal to shut off, so that the process that the main branch conducts to the auxiliary valve is completed; b in fig. 7, which is the main branch shut-off auxiliary valve through-flow phase, the main branch has been completely shut off and current is completely diverted to the auxiliary valve; in fig. 7 c, the main branch and the auxiliary valve are turned off, and the auxiliary valve receives the turn-off signal to turn off the auxiliary valve, and the thyristor valve is in the forward blocking state for receiving the forward voltage. As shown in fig. 8, to detect the control timing of each valve in commutation failure or short-circuit fault, Sg1 is the control timing of the thyristor valve, Sg12 is the control timing of the turn-off valve, Sg13 is the control timing of the auxiliary valve, and t is1For the initial trigger time, the control period T is 2 pi, delta T1Delay duration, Δ t, for switching on the auxiliary valve of the ith bridge arm2Delay period t for switching off the switchable valve of the ith bridge armf+Δt1＜tf+Δt2，Δt3For the on-time of the auxiliary valve, in fig. 8, the time from the zero crossing of the main branch current to the turning off of the auxiliary valve is the off-time Δ t of the thyristor valveoff，ΔtoffIt needs to be greater than the minimum preset off time.
When t isfAfter the control period is over, executing step S1, until the voltage of the hybrid converter topology based on controllable turn-off is recovered to be stable, turning on the shutoff valve of the ith arm of the hybrid converter topology based on controllable turn-off, turning off the auxiliary valve of the ith arm of the hybrid converter topology based on controllable turn-off, and executing step 1;
step S1: switching on a thyristor valve of the ith arm of the hybrid converter topology based on controllable turn-off, switching on a shutoff valve of the ith arm of the hybrid converter topology based on controllable turn-off, switching off an auxiliary valve of the ith arm of the hybrid converter topology based on controllable turn-off, executing step S2 after a time of delta t,
Figure BDA0002154280670000101
step S2: turning off a shutoff valve of the 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 the 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 the ith bridge arm of the hybrid converter topology structure based on controllable turning-off, and enabling the auxiliary valve to pass through delta t'offThen, the process returns to step S1;
wherein, delta t'offThe method is the duration of the thyristor valve of the ith bridge arm of the hybrid converter topology based on controllable turn-off in a control cycle of the step 1 to the step 2 in a forward blocking state.
The invention also provides another control method for the hybrid converter topological structure based on controllable turn-off, which is used for executing the following steps when the situation that the ith bridge arm of the hybrid converter topological structure based on controllable turn-off is about to generate phase change failure or short circuit fault and the ith bridge arm changes the phase to the jth bridge arm is detected in advance:
step T1: switching on a thyristor valve of the ith arm of the hybrid converter topology based on controllable turn-off, switching on a shutoff valve of the ith arm of the hybrid converter topology based on controllable turn-off, switching off an auxiliary valve of the ith arm of the hybrid converter topology based on controllable turn-off, executing a step T2 after a time of delta T,
Figure BDA0002154280670000102
step T2: turning off a shutoff valve of the 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 the 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: the auxiliary valve of the ith bridge arm of the hybrid converter topological structure based on controllable turn-off is turned off and passes through delta t ″offThen, returning to the step T1;
wherein, Δ t ″)offThe method is characterized in that the time length of a thyristor valve of the ith bridge arm of the hybrid converter topological structure based on controllable turn-off in a control period in a forward blocking state is T, and T is a control period.
As shown in fig. 9, the control timing of each valve when a fault is detected in advance is shown, where Sg1 is the control timing of the thyristor valve, Sg12 is the control timing of the turn-off valve, Sg13 is the control timing of the auxiliary valve, and Δ tonIs the conduction time, delta t ″, of the thyristor valveoffThe control period T is 2 pi for the forward blocking time of the thyristor valve, delta T is the conducting duration of the closable valve,
Figure BDA0002154280670000111
Δ t13 isThe conducting time of the auxiliary valve is long, and the time from the zero crossing of the main branch current to the closing of the auxiliary valve is the closing time delta t of the thyristor valveoff，ΔtoffIt needs to be greater than the minimum preset off time. The operation mode is started when the phase commutation failure is predicted to occur, the phase commutation failure can be successfully avoided, low-turn-off angle operation can be realized, and reactive power of an inverter side is effectively reduced.
As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (12)

1. A hybrid converter topological structure based on controllable turn-off is characterized in that the topological structure is a three-phase six-leg circuit, and the three-phase six-leg 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 both 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 turning off forward current and blocking forward and reverse voltage;
the main branch consists of a thyristor valve and a shutoff valve which are connected in series and have the capabilities of controllably shutting off forward current and blocking forward voltage.
2. The topology of claim 1, wherein the thyristor valve is comprised of a plurality of thyristors and a buffer component in series or parallel with each thyristor.
3. The topology of claim 1, wherein the shutoff valve consists of 1 or more power modules in series and a buffer component in series or parallel with each power module;
the power module is composed of one or more of fully-controlled power electronic devices with reverse voltage blocking capability, or is composed of fully-controlled power electronic devices without reverse voltage blocking capability and diodes which are connected with the fully-controlled power electronic devices without reverse voltage blocking capability in an anti-parallel mode.
4. The topology according to claim 1, wherein said interruptible valve consists of 1 or more first interruptible branches in series and a buffer component in series or in parallel with each of said 1 or more first interruptible 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 both composed of one or more of fully-controlled power electronic devices with reverse voltage blocking capability, or composed of fully-controlled power electronic devices without reverse voltage blocking capability and diodes connected in anti-parallel with the fully-controlled power electronic devices 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 shut-off valve or connection points of other first shut-off branches in the shut-off valve.
5. The topology of claim 1, wherein the auxiliary valve is comprised of a plurality of auxiliary sub-modules in series and a buffer component in series or parallel with each of the 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 with the power module in series;
the power module is composed of one or more of fully-controlled power electronic devices with reverse voltage blocking capability, or is composed of fully-controlled power electronic devices without reverse voltage blocking capability and diodes which are connected with the fully-controlled power electronic devices without reverse voltage blocking capability in an anti-parallel mode.
6. The topology of claim 1, wherein the auxiliary valve is comprised of an auxiliary timing control branch and a diode branch in series;
the diode branch circuit consists of a plurality of diodes which are connected in series in the forward direction and a buffer component which is connected in series or in parallel with each diode in the plurality of diodes which are connected in series in the forward direction;
the auxiliary time sequence control branch consists of 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 is composed of one or more of fully-controlled power electronic devices with reverse voltage blocking capability, or is composed of fully-controlled power electronic devices without reverse voltage blocking capability and diodes which are connected with the fully-controlled power electronic devices without reverse voltage blocking capability in an anti-parallel mode.
7. The topology of claim 1, wherein the auxiliary valve is comprised 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 sequential control branches which are connected in series in the forward direction;
the auxiliary time sequence control branch consists of 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 is composed of one or more of fully-controlled power electronic devices with reverse voltage blocking capability, or is composed of fully-controlled power electronic devices without reverse voltage blocking capability and diodes which are connected with the fully-controlled power electronic devices without reverse voltage blocking capability in an anti-parallel mode;
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 both external connection points of the auxiliary valve or connection points of other first power electronic units in the auxiliary valve.
8. The topology of claim 1, wherein the auxiliary valve is comprised 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 circuit consists of a plurality of diodes which are connected in series in the forward direction and a buffer component which is connected in series or in parallel with each diode in the plurality of diodes which are connected in series in the forward direction;
the auxiliary time sequence control branch consists of 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 is composed of one or more of fully-controlled power electronic devices with reverse voltage blocking capability, or is composed of fully-controlled power electronic devices without reverse voltage blocking capability and diodes which are connected with the fully-controlled power electronic devices without reverse voltage blocking capability in an anti-parallel mode;
the connection points of the two diode branches of the third auxiliary branch and the connection points of the two diode branches of the fourth auxiliary branch are both external connection points of the auxiliary valve or connection points of the auxiliary valve and other second power electronic units in the auxiliary valve.
9. The topology of any of claims 2-8, wherein the buffer component is comprised of one or more of a capacitor, a resistor-capacitor circuit, a diode, an inductor, or a surge arrester connected in series or in parallel.
10. A method of controlling a hybrid converter topology according to any of claims 1-8, the method comprising:
switching on a shutoff valve of the ith bridge arm of the hybrid converter topology, switching off an auxiliary valve of the ith bridge arm of the hybrid converter topology, and executing the following steps:
step 1: conducting a thyristor valve of the ith bridge arm of the topological structure of the hybrid converter, and executing the step 2;
step 2: returning to the step 1 after a control period T;
wherein i ∈ [1,6 ].
11. The method of claim 10, when at tfWhen detecting that the ith bridge arm of the topological structure of the hybrid converter has phase commutation failure or short-circuit fault at any moment, at tf+Δt1Switching on the auxiliary valve of the i-th arm at a time and at tf+Δt2The method comprises the steps of closing a shutoff valve of the ith bridge arm at any time, closing an auxiliary valve of the ith bridge arm when a thyristor valve of the ith bridge arm of the hybrid converter topology is in a forward blocking state, and closing the auxiliary valve of the ith bridge arm when t isfAfter the control period is over, executing step S1, until the voltage of the hybrid converter topology is restored to be stable, turning on the shutoff valve of the ith bridge arm of the hybrid converter topology, turning off the auxiliary valve of the ith bridge arm of the hybrid converter topology, and executing step 1;
step S1: conducting a thyristor valve of the ith bridge arm of the hybrid converter topology, conducting a shutoff valve of the ith bridge arm of the hybrid converter topology, shutting off an auxiliary valve of the ith bridge arm of the hybrid converter topology, and executing step S2 after a delta t;
step S2: turning off a shutoff valve of the ith bridge arm of the hybrid converter topology, turning on an auxiliary valve of the ith bridge arm of the hybrid converter topology, and executing the step S3 when a thyristor valve of the ith bridge arm of the hybrid converter topology is in a forward blocking state;
step S3: turning off an auxiliary valve of the ith bridge arm of the hybrid converter topology and passing through delta t'offThen, the process returns to step S1;
wherein, delta t'offThe time length of the thyristor valve of the ith bridge arm of the hybrid converter topology in the forward blocking state in order to execute the step 1 to the step 2 within one control period, delta t1Delay duration, Δ t, for switching on the auxiliary valve of the ith bridge arm2The delay time for switching off the shutoff valve of the ith bridge arm, at is the conduction time of the shutoff valve,
Figure FDA0002154280660000041
t is a control period, Δ T1＜Δt2，i∈[1，6]。
12. A method of controlling a hybrid converter topology according to any of claims 1-8, the method comprising:
step T1: switching on a thyristor valve of the ith arm of the hybrid converter topology, switching on a shutoff valve of the ith arm of the hybrid converter topology, switching off an auxiliary valve of the ith arm of the hybrid converter topology, executing a step T2 after a time of delta T,
Figure FDA0002154280660000042
step T2: turning off a shutoff valve of the ith bridge arm of the hybrid converter topology, turning on an auxiliary valve of the ith bridge arm of the hybrid converter topology, and executing the step T3 when a thyristor valve of the ith bridge arm of the hybrid converter topology is in a forward blocking state;
step T3: the auxiliary valve of the ith bridge arm of the hybrid converter topological structure is turned off and passes through delta t ″offThen, returning to the step T1;
wherein, Δ t ″)offIs one control cycleThe time length of the thyristor valve of the ith bridge arm of the hybrid converter topology in the period is in a forward blocking state, delta t is the conducting time length of the shutoff valve,
Figure FDA0002154280660000043
t is a control period, i belongs to [1,6]]。
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113991982A (en) * 2021-10-29 2022-01-28 许继电气股份有限公司 Controllable turn-off current source type current converter and control method thereof
CN114050708A (en) * 2022-01-12 2022-02-15 清华大学 Control method, device, equipment and storage medium for converter full-control device
WO2022160791A1 (en) * 2021-02-01 2022-08-04 全球能源互联网研究院有限公司 Topological structure of hybrid converter and control method therefor
CN116865738A (en) * 2023-09-04 2023-10-10 中国科学院电工研究所 Direct-current solid-state circuit breaker circuit topology based on semi-controlled device and control method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113014086B (en) * 2021-03-08 2022-02-01 东南大学 Direct-current transformer topological structure with high voltage transmission ratio and control method thereof
CN113270887B (en) * 2021-06-03 2023-11-28 许继集团有限公司 DC power transmission control method and system based on controllable turn-off current source converter
CN113708351B (en) * 2021-07-14 2023-08-04 中国南方电网有限责任公司超高压输电公司广州局 Inverter for DC fault ride through and control method

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103424679A (en) * 2012-05-22 2013-12-04 Ls产电株式会社 Apparatus for testing thyristor valve
CN104767171A (en) * 2014-01-06 2015-07-08 国家电网公司 High-voltage DC circuit breaker and realization method thereof
CN104901269A (en) * 2015-06-02 2015-09-09 荣信电力电子股份有限公司 All-solid-state DC breaker and control method thereof
CN105281303A (en) * 2015-10-14 2016-01-27 南京南瑞继保电气有限公司 Mixed-type high-voltage DC breaker and implementation method thereof
CN105870877A (en) * 2016-03-14 2016-08-17 全球能源互联网研究院 Thyristor-based passive hybrid direct current circuit breaker and application method therefor
CN106786349A (en) * 2016-11-22 2017-05-31 平高集团有限公司 A kind of assist exchanging circuit module and high voltage DC breaker
CN107026577A (en) * 2017-04-21 2017-08-08 清华大学 A kind of modularization multi-level converter of cut-off direct-current short circuit fault current
CN108712090A (en) * 2018-07-03 2018-10-26 清华大学 A kind of D.C. high voltage transmission mixing transverter
CN110021919A (en) * 2019-04-28 2019-07-16 北京交通大学 Intensive bridge-type multiport mixed DC breaker and control method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103986178B (en) * 2014-05-09 2017-01-04 华北电力大学 A kind of LCC-HVDC topological structure and controlled submodule charging initial voltage thereof determine method
CN106026012B (en) * 2016-06-29 2018-01-09 中国西电电气股份有限公司 A kind of mixing type active type high voltage DC breaker
CN109742783B (en) * 2018-11-14 2022-07-22 南京南瑞继保电气有限公司 Method and device for online quitting voltage source type current converter of hybrid direct-current transmission system

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103424679A (en) * 2012-05-22 2013-12-04 Ls产电株式会社 Apparatus for testing thyristor valve
CN104767171A (en) * 2014-01-06 2015-07-08 国家电网公司 High-voltage DC circuit breaker and realization method thereof
CN104901269A (en) * 2015-06-02 2015-09-09 荣信电力电子股份有限公司 All-solid-state DC breaker and control method thereof
CN105281303A (en) * 2015-10-14 2016-01-27 南京南瑞继保电气有限公司 Mixed-type high-voltage DC breaker and implementation method thereof
CN105870877A (en) * 2016-03-14 2016-08-17 全球能源互联网研究院 Thyristor-based passive hybrid direct current circuit breaker and application method therefor
CN106786349A (en) * 2016-11-22 2017-05-31 平高集团有限公司 A kind of assist exchanging circuit module and high voltage DC breaker
CN107026577A (en) * 2017-04-21 2017-08-08 清华大学 A kind of modularization multi-level converter of cut-off direct-current short circuit fault current
CN108712090A (en) * 2018-07-03 2018-10-26 清华大学 A kind of D.C. high voltage transmission mixing transverter
CN110021919A (en) * 2019-04-28 2019-07-16 北京交通大学 Intensive bridge-type multiport mixed DC breaker and control method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022160791A1 (en) * 2021-02-01 2022-08-04 全球能源互联网研究院有限公司 Topological structure of hybrid converter and control method therefor
CN113991982A (en) * 2021-10-29 2022-01-28 许继电气股份有限公司 Controllable turn-off current source type current converter and control method thereof
CN113991982B (en) * 2021-10-29 2023-10-20 许继电气股份有限公司 Controllable turn-off current source type converter and control method thereof
CN114050708A (en) * 2022-01-12 2022-02-15 清华大学 Control method, device, equipment and storage medium for converter full-control device
CN114050708B (en) * 2022-01-12 2022-06-17 清华大学 Control method, device, equipment and storage medium of converter full-control device
CN116865738A (en) * 2023-09-04 2023-10-10 中国科学院电工研究所 Direct-current solid-state circuit breaker circuit topology based on semi-controlled device and control method
CN116865738B (en) * 2023-09-04 2023-11-28 中国科学院电工研究所 Direct-current solid-state circuit breaker circuit topology based on semi-controlled device and control method

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