CN109830950A - High step-down ratio multiterminal element transformer with fault ride-through capacity - Google Patents
High step-down ratio multiterminal element transformer with fault ride-through capacity Download PDFInfo
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- CN109830950A CN109830950A CN201910145341.0A CN201910145341A CN109830950A CN 109830950 A CN109830950 A CN 109830950A CN 201910145341 A CN201910145341 A CN 201910145341A CN 109830950 A CN109830950 A CN 109830950A
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- 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 discloses a kind of high step-down ratio multiterminal element transformer with fault ride-through capacity, it is made of 2 stage converter, it is interconnected suitable for mesolow direct current system, front stage converter is connected with middle straightening Flow Line, is made of full-bridge sub-module cascade, realize that decompression passes through function with DC Line Fault, rear class converter is formed by multiple wired in parallel, and each module is made of bridge circuit and high frequency transformer, is connected with low-voltage direct route, it realizes isolation and voltage stabilizing function, meets different load demand.When bipolar short trouble occurs for commutator transformer medium voltage side, detect fault signature, the front stage converter of quick lock commutator transformer, backward voltage is provided for DC line, quickly reduces fault current to zero, commutator transformer restores to operate normally after fault clearance, entirely failure occurs, detection, removes, being not necessarily to dc circuit breaker disconnection DC line in recovery process, be conducive to the fast quick-recovery of system, complete bipolar short trouble and pass through, realize the stable operation of direct current system.
Description
Technical field
The invention belongs to applied power electronics technical field more particularly to a kind of high step-down ratios with fault ride-through capacity
Multiterminal element transformer.
Background technique
In future time, it will have a large amount of clean energy resource and DC load access power grid, power grid source and load side meeting
Recurring structure variation.With the maturation of power electronic technique, direct current system can effectively integrate DC power supply and direct current is negative
Lotus is a kind of very promising grid mode.
In fields such as communication, traffic, renewable energy, low-voltage direct application technology has obtained good popularization.Meanwhile
Under the joint efforts of scholar and enterprise, the high voltage dc transmission technology of high-power power transmission also achieves significant progress.But
It is adequately explored and is developed not yet due to lacking corresponding transformation and protection technique, middle straightening stream application technology.Direct current
Transformer is the different DC voltages of connection, the key equipment for constructing DC grid.Interconnection for mesolow direct current system, high drop
Pressure ratio commutator transformer technology is still a cutting edge technology.Commutator transformer is conducive to the peace of system using high frequency transformer isolation
Full guard also helps the volume for reducing device.Other than voltage transformation and the demand of isolation, since commutator transformer is using electricity
Power electronic device, reliability is lower than existing AC transformer, therefore commutator transformer also needs to have DC line fault
Ride-through capability.
High no-load voltage ratio demand and failure for the interconnection of mesolow direct current system maintain DC line and direct current to become after occurring
This Study on Problems of depressor safety is less, so urgently needing to propose that a kind of high step-down ratio direct current with fault ride-through capacity becomes
Depressor.
Summary of the invention
Goal of the invention: in view of the above problems, the present invention proposes that a kind of high step-down ratio multiterminal with fault ride-through capacity are straight
Convertor transformer.
Technical solution: to achieve the purpose of the present invention, the technical scheme adopted by the invention is that: one kind having fault traversing
The high step-down ratio multiterminal element transformer of ability, including front stage converter and rear class converter, the front stage converter is by full-bridge
Sub-module cascade composition, prime are connected with middle straightening Flow Line, realize that decompression passes through function with DC Line Fault；The rear class transformation
Device is made of multiple wired in parallel, and rear class is connected with low-voltage direct route, is realized isolation and voltage stabilizing function, is met different load need
It asks.
Further, the front stage converter includes upper and lower bridge arm inductance, upper and lower bridge arm chained block, filter inductance and filter
Wave capacitor, upper bridge arm chained block are connected by upper bridge arm inductance with middle straightening Flow Line anode, and lower bridge arm chained block passes through
Lower bridge arm inductance is connected with middle straightening Flow Line cathode, and upper and lower bridge arm chained block is connected and passes through filter inductance, filter capacitor
It is connected with rear class converter.
Further, the rear class converter is formed by multiple wired in parallel, and each module includes full-controlled bridge inversion electricity
Road, high-frequency isolation transformer, full-controlled bridge rectification circuit or diode uncontrollable rectifier circuit and filtering part, the full control
The input of bridge inverter main circuit is connected with the output of front stage converter, and output is connected with high-frequency isolation transformer, the fully controlled bridge
The input of formula rectification circuit or diode bridge rectifier circuit is connected with high-frequency isolation transformer, and output is accessed by filtering part
Low-voltage direct route.
Further, the chained block is made of n identical sub-module cascades, submodule in upper and lower bridge arm chained block
Block number can be identical or different, is determined by specific voltage class and no-load voltage ratio.
Further, the submodule is bridge-type submodule, is made of a capacitor and four full-controlled switch pipes, the
One full-controlled switch pipe is connected with third full-controlled switch pipe with capacitance cathode, and tetra- full-control type of the second full-controlled switch Guan Yu is opened
Guan Guanyu capacitor cathode is connected；After the bridge-type submodule locking, the electric current of submodule is flowed through regardless of direction, is passed through
Freewheeling diode provides backward voltage to capacitor charging, for DC line.
Further, the full-controlled bridge inverter circuit is made of four full-controlled switch pipes, the first full-controlled switch pipe
It is connected with third full-controlled switch pipe with front stage converter output cathode, tetra- full-controlled switch pipe of the second full-controlled switch Guan Yu
It is connected with front stage converter output negative pole.
Further, the full-controlled bridge rectification circuit or diode bridge rectifier circuit are made of four switching tubes, the
One switching tube is connected with third switching tube with filtering part anode, second switch and the 4th switching tube and filtering part cathode phase
Even.
The utility model has the advantages that commutator transformer of the invention has the advantages such as high step-down ratio, high-efficient, the cascade of prime Neutron module
So that the requirement on devices such as switch tube, capacitor are low, it is provided simultaneously with DC line fault ride-through capability, rear class uses disparate modules simultaneously
Connection mode meets different workload demands, disconnected without dc circuit breaker in the generation of entire failure, detection, removing, recovery process
DC line is opened, the fast quick-recovery of system is conducive to.
Detailed description of the invention
Fig. 1 is the high step-down ratio commutator transformer topological diagram that the present invention has fault ride-through capacity；
Fig. 2 is bridge-type submodule topological diagram of the present invention；
Fig. 3 is that submodule of the present invention operates normally and the current loop figure under blocking；
Fig. 4 is commutator transformer front stage converter control block diagram of the present invention；
Fig. 5 is commutator transformer example output waveform of the present invention.
Specific embodiment
Further description of the technical solution of the present invention with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of high step-down ratio multiterminal element transformer with fault ride-through capacity of the present invention, by
Two-stage type framework composition, including front stage converter and rear class converter.Prime is connected with middle straightening Flow Line, by full-bridge submodule
Cascade composition realizes that decompression passes through function with DC Line Fault.Rear class is formed by multiple wired in parallel, and each module is by bridge circuit
It forms with high frequency transformer, is connected with low-voltage direct route, realize isolation and voltage stabilizing function, meet different load demand.
Front stage converter, by upper and lower bridge arm inductance, upper and lower bridge arm chained block, a filter inductance and a filter capacitor
Composition.Upper bridge arm chained block is connected by upper bridge arm inductance with middle straightening Flow Line anode, under lower bridge arm chained block passes through
Bridge arm inductance is connected with middle straightening Flow Line cathode；Upper and lower bridge arm chained block be connected and pass through filter inductance, filter capacitor with
Rear class converter is connected.Chained block is made of n identical sub-module cascades, and upper and lower bridge arm chained block Neutron module number can
With identical or different, determined by specific voltage class and no-load voltage ratio.Front stage converter control is equal using PWM control strategy and submodule
Control strategy is pressed, as shown in Figure 4.
Chained block is made of n identical sub-module cascades, and submodule is bridge-type submodule, by a capacitor and four
A full-controlled switch pipe composition, the first full-controlled switch pipe are connected with third full-controlled switch pipe with capacitance cathode, the second full control
Type switching tube is connected with the 4th full-controlled switch pipe with capacitor cathode.After the locking of bridge-type submodule, the electric current of submodule is flowed through
, can only be by freewheeling diode to capacitor charging regardless of direction, this, which is equivalent to, provides backward voltage for DC line, helps
In the extinguishing of short circuit current and the quick removing of failure.
Rear class converter is formed by multiple wired in parallel, and each module is by full-controlled bridge inverter circuit, high-frequency isolation transformation
Device, full-controlled bridge rectification circuit or diode bridge rectifier circuit and filtering part composition, full-controlled bridge inverter circuit it is defeated
Enter the output with front stage converter to be connected, output is connected with high-frequency isolation transformer, full-controlled bridge rectification circuit or diode bridge
The input of formula rectification circuit is connected with high-frequency isolation transformer, and output accesses low-voltage direct route by filtering part.
Full-controlled bridge inverter circuit is made of four full-controlled switch pipes, and the first full-controlled switch pipe is opened with third full-control type
Guan Guanyu front stage converter output cathode is connected, and tetra- full-controlled switch pipe of the second full-controlled switch Guan Yu and front stage converter are defeated
Cathode is connected out.Full-controlled bridge rectification circuit or diode bridge rectifier circuit are made of four switching tubes, first switch tube with
Third switching tube is connected with filtering part anode, and second switch is connected with the 4th switching tube with filtering part cathode.
As shown in Fig. 2, submodule is bridge-type submodule, it is made of a capacitor and four full-controlled switch pipes, first
Full-controlled switch pipe is connected with third full-controlled switch pipe with capacitance cathode, tetra- full-controlled switch of the second full-controlled switch Guan Yu
Pipe is connected with capacitor cathode.Fig. 3 (a) is that submodule operates normally circuit, exports two kinds of level of no-voltage and positive capacitance voltage.Figure
Current loop after the locking of 3 (b) bridge-type submodules, flows through the electric current of submodule regardless of direction, can only pass through two pole of afterflow
For pipe to capacitor charging, this, which is equivalent to, provides backward voltage for DC line, facilitate short circuit current extinguishing and failure it is quick
It removes.
Fault ride-through capacity is to detect fault signature, fastly when bipolar short trouble occurs for commutator transformer medium voltage side
The front stage converter of speed locking commutator transformer, short circuit current can only flow through submodule by freewheeling diode, at capacitor
In charged state, backward voltage is provided for DC line, quickly reduces fault current to zero, commutator transformer is extensive after fault clearance
It is multiple to operate normally, DC line is disconnected without dc circuit breaker in the generation of entire failure, detection, removing, recovery process, favorably
In the fast quick-recovery of system, completes bipolar short trouble and pass through, realize the stable operation of direct current system.
There is the feasibility of the high step-down ratio commutator transformer of fault ride-through capacity for verifying, in Matlab/Simulink
DC Transformer model is built on emulation platform.Upper bridge arm chained block Neutron module quantity is 4, lower bridge arm chained block neutron
Module number is 2, and control uses Phase-shifted PWM Control Method, and specific simulation parameter is as shown in table 1.Commutator transformer output voltage
As shown in Figure 5.
Table 1
Claims (7)
1. a kind of high step-down ratio multiterminal element transformer with fault ride-through capacity, which is characterized in that including front stage converter
With rear class converter, the front stage converter is made of full-bridge sub-module cascade, and prime is connected with middle straightening Flow Line, realizes drop
Pressure passes through function with DC Line Fault；The rear class converter is made of multiple wired in parallel, and rear class is connected with low-voltage direct route,
It realizes isolation and voltage stabilizing function, meets different load demand.
2. the high step-down ratio multiterminal element transformer according to claim 1 with fault ride-through capacity, which is characterized in that
The front stage converter includes upper and lower bridge arm inductance, upper and lower bridge arm chained block, filter inductance and filter capacitor, upper bridge arm chain type
Module is connected by upper bridge arm inductance with middle straightening Flow Line anode, and lower bridge arm chained block passes through lower bridge arm inductance and middle straightening
Flow Line cathode is connected, and upper and lower bridge arm chained block is connected and passes through filter inductance, filter capacitor is connected with rear class converter.
3. the high step-down ratio multiterminal element transformer according to claim 1 with fault ride-through capacity, which is characterized in that
The rear class converter is formed by multiple wired in parallel, each module include full-controlled bridge inverter circuit, high-frequency isolation transformer,
Full-controlled bridge rectification circuit or diode uncontrollable rectifier circuit and filtering part, the input of the full-controlled bridge inverter circuit
It is connected with the output of front stage converter, output is connected with high-frequency isolation transformer, the full-controlled bridge rectification circuit or diode
The input of bridge rectifier is connected with high-frequency isolation transformer, and output accesses low-voltage direct route by filtering part.
4. the high step-down ratio multiterminal element transformer according to claim 2 with fault ride-through capacity, which is characterized in that
The chained block is made of n identical sub-module cascades, and upper and lower bridge arm chained block Neutron module number can be identical or not
Together, it is determined by specific voltage class and no-load voltage ratio.
5. the high step-down ratio multiterminal element transformer according to claim 4 with fault ride-through capacity, which is characterized in that
The submodule is bridge-type submodule, is made of a capacitor and four full-controlled switch pipes, the first full-controlled switch pipe with
Third full-controlled switch pipe is connected with capacitance cathode, tetra- full-controlled switch pipe of the second full-controlled switch Guan Yu and capacitor cathode phase
Even；After the bridge-type submodule locking, the electric current of submodule is flowed through regardless of direction, passes through freewheeling diode to capacitor
Charging, provides backward voltage for DC line.
6. the high step-down ratio multiterminal element transformer according to claim 3 with fault ride-through capacity, which is characterized in that
The full-controlled bridge inverter circuit is made of four full-controlled switch pipes, the first full-controlled switch pipe and third full-controlled switch pipe
It is connected with front stage converter output cathode, tetra- full-controlled switch pipe of the second full-controlled switch Guan Yu and front stage converter output are negative
Extremely it is connected.
7. the high step-down ratio multiterminal element transformer according to claim 3 with fault ride-through capacity, which is characterized in that
The full-controlled bridge rectification circuit or diode bridge rectifier circuit are made of four switching tubes, and first switch tube and third switch
Pipe is connected with filtering part anode, and second switch is connected with the 4th switching tube with filtering part cathode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910145341.0A CN109830950B (en) | 2019-02-27 | 2019-02-27 | High-voltage-reduction-ratio multi-terminal direct-current transformer with fault ride-through capability |
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| CN201910145341.0A CN109830950B (en) | 2019-02-27 | 2019-02-27 | High-voltage-reduction-ratio multi-terminal direct-current transformer with fault ride-through capability |
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| CN109830950B CN109830950B (en) | 2022-08-19 |
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Cited By (6)
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| CN110677026A (en) * | 2019-07-25 | 2020-01-10 | 西安交通大学 | Double-active-bridge-structure-based fault current limiting topology and current limiting method for solid-state transformer |
| CN110797903A (en) * | 2019-12-05 | 2020-02-14 | 国网江苏省电力有限公司扬州供电分公司 | Rapid fault recovery method for flexible direct-current power distribution network of energy storage built-in converter |
| CN113098276A (en) * | 2021-03-10 | 2021-07-09 | 国网江苏省电力有限公司电力科学研究院 | Photovoltaic direct-current transformer topological structure and no-latching fault ride-through control method |
| CN114050566A (en) * | 2021-08-19 | 2022-02-15 | 天津大学 | Short-circuit fault ride-through circuit of direct-current power distribution network containing DAB type direct-current transformer |
| CN117639517A (en) * | 2024-01-25 | 2024-03-01 | 广东工业大学 | Fault isolation type medium-voltage direct-current transformer and control strategy thereof |
| CN117639517B (en) * | 2024-01-25 | 2024-04-26 | 广东工业大学 | Fault isolation type medium-voltage direct-current transformer and control strategy thereof |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110677026A (en) * | 2019-07-25 | 2020-01-10 | 西安交通大学 | Double-active-bridge-structure-based fault current limiting topology and current limiting method for solid-state transformer |
| CN110677026B (en) * | 2019-07-25 | 2021-04-20 | 西安交通大学 | Double-active-bridge-structure-based fault current limiting topology and current limiting method for solid-state transformer |
| CN110797903A (en) * | 2019-12-05 | 2020-02-14 | 国网江苏省电力有限公司扬州供电分公司 | Rapid fault recovery method for flexible direct-current power distribution network of energy storage built-in converter |
| CN113098276A (en) * | 2021-03-10 | 2021-07-09 | 国网江苏省电力有限公司电力科学研究院 | Photovoltaic direct-current transformer topological structure and no-latching fault ride-through control method |
| CN113098276B (en) * | 2021-03-10 | 2022-10-21 | 国网江苏省电力有限公司电力科学研究院 | Photovoltaic direct-current non-blocking fault ride-through control method and transformer topological structure |
| CN114050566A (en) * | 2021-08-19 | 2022-02-15 | 天津大学 | Short-circuit fault ride-through circuit of direct-current power distribution network containing DAB type direct-current transformer |
| CN114050566B (en) * | 2021-08-19 | 2023-06-13 | 天津大学 | Short-circuit fault ride-through circuit of direct-current distribution network containing DAB (DAB) type direct-current transformer |
| CN117639517A (en) * | 2024-01-25 | 2024-03-01 | 广东工业大学 | Fault isolation type medium-voltage direct-current transformer and control strategy thereof |
| CN117639517B (en) * | 2024-01-25 | 2024-04-26 | 广东工业大学 | Fault isolation type medium-voltage direct-current transformer and control strategy thereof |
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