CN107546844A - A kind of electric power electric transformer concatenated power module redundancy fault tolerant control method - Google Patents
A kind of electric power electric transformer concatenated power module redundancy fault tolerant control method Download PDFInfo
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- CN107546844A CN107546844A CN201710699518.2A CN201710699518A CN107546844A CN 107546844 A CN107546844 A CN 107546844A CN 201710699518 A CN201710699518 A CN 201710699518A CN 107546844 A CN107546844 A CN 107546844A
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Abstract
A kind of electric power electric transformer concatenated power module redundancy fault tolerant control method, suitable for Cascade H bridge type electric power electric transformer.When concatenated power module breaks down, in the case where meeting fault-tolerant operation condition, by fault power module bypass, and the switching device trigger signal of fault power module is reassigned to a redundant module, make the smooth redundancy switching of electric power electric transformer, realize the gapless and accuracy of redundancy switching.
Description
Technical field
The present invention relates to a kind of redundant fault-tolerant control method of electric power electric transformer concatenated power module.
Background technology
Electric power electric transformer also has in addition to the voltage class conversion with traditional transformer and electrical isolation function
There are trend double-direction control, utility power quality control, unit self-protection shield the multiple functions such as to exchange with information with self diagnosis, communication, and
AC and DC port with different voltage class, suitable for the flexible of polytype distributed energy, energy storage and load
Access, and the interconnection of AC/DC power network.It is played in intelligent grid, energy internet and following AC-DC interconnecting power network
Irreplaceable important function, it is that it realizes transformation of electrical energy and the core apparatus of processing.
As a kind of flexible electric equipment applied to distribution system, the electric power electric transformer equipment reliability pair of itself
It is particularly important in the safe and reliable operation of power distribution network.It can be effectively improved using redundancy and fault-toleranr technique and improve power electronics transformation
The reliability of device.For the redundant fault-tolerant control method of electric power electric transformer, it usually needs recalculate voltage vector or
Phase-shifting carrier wave angle, or change modulation ratio.Such as Chinese patent CN103916041A, Chinese patent CN103560689A etc..
The shortcomings that these existing programs is the control method that complexity is needed after power model failure, and recalculates each work(
The modulated signal of rate module, thus switching at runtime transient process is longer, and can not avoid producing electric current punching when redundancy switches
Hit.
The content of the invention
It is an object of the invention to overcome existing electric power electric transformer concatenated power module redundancy fault-tolerant operation control multiple
The shortcomings that miscellaneous, propose a kind of electric power electric transformer concatenated power module redundancy fault tolerant control method.The present invention need not adjust work(
The phase-shifting carrier wave angle of rate module, without recalculating modulated signal, you can realize trouble unit exit and redundant module
Input, the switching at runtime process quick and smooth of each power model state.
Formed using the electric power electric transformer of the present invention per circuitry phase by N+m power module cascade connection, and single-phase electricity
Road can independent operating.Wherein, N and m is positive integer, and N is without including redundant module in electric power electric transformer single-phase circuit
Concatenated power module number, m is redundant power module number.Each power model is humorous by H-bridge unit and double active bridge series connection
Vibration shape DC-DC converter forms.The present invention is exported to wherein each series resonance-type DC-DC converter using the square-wave voltage of open loop
Control method, under the mode that primary side DC energy storage electric capacity is connected in parallel, each DC-DC converter primary side DC energy storage electric capacity
Voltage can realize automatic equalization.
The redundancy control method of electric power electric transformer concatenated power module of the present invention can be automatically equal in power module voltage
On the premise of weighing apparatus, once occur power model failure, as long as meeting fault-tolerant operation condition, i.e., fault power module number be less than or
Equal to redundant power module number m, can be adjusted by fault power module bypass, and by the pulsewidth of H-bridge unit in fault power module
Signal processed is reassigned to the H-bridge unit in a redundant power module, makes the smooth redundancy switching of electric power electric transformer, specifically
Step is as follows：
(1) controller of electric power electric transformer calculates the road-load ripple phase-shifted pulse width modulation signals of N, and wherein N is power electronics
The concatenated power module number including redundant module, adjacent two-way phase-shifting carrier wave pulsewidth modulation are free of in transformer single-phase circuit
The phase shifting angle of signal is identical；
(2) controller of electric power electric transformer distributes to the road-load ripple phase-shifted pulse width modulation signals of N without redundant module
With the series power module of N number of input state including fault power module；
(3) controller of electric power electric transformer monitors the working condition of each power model in real time；
(4) during power model failure, the controller of electric power electric transformer recognizes event according to each power model real-time status
Hinder power model；
(5) controller of electric power electric transformer judges whether electric power electric transformer concatenated power circuit meets that redundancy is held
Whether wrong service condition, i.e. fault power module number are not more than redundant module quantity m.If meet that redundancy fault-tolerant runs bar
Part, then the controller of electric power electric transformer to fault power module issue locking and bypass action command, under redundant module
Hair input instruction, redundant module is switched into input state by stand-by state, and by the H bridge pulsewidth modulations in fault power module
Signal is sent to redundant module；If fault power module number is more than redundant module quantity m, redundancy fault-tolerant operation bar is unsatisfactory for
Part, then the controller of electric power electric transformer issue trip signal, electric power electric transformer concatenated power circuit is shut down and exited
Operation.
The Cascade H bridge circuit of described electric power electric transformer high-voltage alternating side uses phase-shifting carrier wave formula pulsewidth modulation side
Method, and there is N number of power model to be in input state all the time, m redundant power module is in stand-by state.In input state
N number of power model in H-bridge circuit use phase-shifting carrier wave formula pulse duration modulation method；The m redundant power mould in stand-by state
The H-bridge circuit of block is in the on off state of output no-voltage.Once there is power model failure in N number of power model, must hold
Row locking bypass instruction is by fault power module bypass, while redundant power module switches to input state by stand-by state, and
Phase-shifting carrier wave formula sinusoidal pulse width modulation state is switched to by the on off state of output no-voltage so that there is N high-voltage alternating side all the time
Individual H-bridge circuit participates in pulsewidth modulation.
The redundancy control method of electric power electric transformer of the present invention has the characteristics that and advantage：
1. input stage need not change phase shift using the phase-shifting carrier wave modulator approach of fixed phase shifting angle after power model bypass
Angle, simplify control algolithm.
2. each power model DC voltage automatic equalization, and only pass through between fault power module and redundant power module
Exchange triggering command and redundancy switching can be achieved, handoff procedure is smoothly quick.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of Monophase electric power electronic transformer；
Fig. 2 is power module circuit schematic diagram；
In figure：1H bridges unit, 2 couples of active bridge series resonance-type DC-DC converters, KpBy-pass switch, ChPrimary side direct current stores up
Can electric capacity, CrSeries resonant capacitance, ThfHigh frequency transformer, ClPrimary side DC energy storage electric capacity, KfSection breaker；
Fig. 3 implements electric power electric transformer concatenated power module redundancy control principle drawing for the present invention.
Embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
As shown in figure 1, illustrated by taking electric power electric transformer single-phase circuit as an example.The electric power electric transformer single-phase electricity
N+m power module cascade connection of route is formed, and single-phase circuit can independent operating.Wherein, N and m is positive integer, and N is irredundant mould
Series power module quantity needed for electric power electric transformer during block, m are redundant power module number.Wrapped in each power model
Containing H-bridge unit, double active bridge series resonance-type DC-DC converter, by-pass switch and section breakers.Double active bridge series resonance-types
DC-DC converter uses the square-wave voltage output control of open loop.Under the mode that primary side DC energy storage electric capacity is connected in parallel, respectively
DC-DC converter primary side DC energy storage capacitance voltage can realize automatic equalization.
As shown in Fig. 2 the connected mode of the power model is：By-pass switch KpIt is connected to the exchange output a of H-bridge unit
On terminal and b terminals.The DC output terminal of H-bridge unit is x, y, the primary of double active bridge series resonance-type DC-DC converters
Side DC energy storage electric capacity ChIt is connected to direct current output x-terminal and y terminals, primary side DC energy storage electric capacity ClPositive terminal j pass through
It is connected to after being connected with section breaker Kf on the positive terminal h of dc bus.
The redundancy control method of electric power electric transformer concatenated power module of the present invention is：Can be automatic in power module voltage
On the premise of equilibrium, once power model failure occurs, as long as meeting fault-tolerant operation condition, i.e. fault power module number is less than
Or equal to redundant power module number m, can be by fault power module bypass, and by the pulsewidth of H-bridge unit in fault power module
Modulated signal is reassigned to the H-bridge unit in a redundant power module, makes the smooth redundancy switching of electric power electric transformer.Such as
Shown in Fig. 3, redundancy control method of the present invention specifically includes following steps：
(1) controller of electric power electric transformer calculates the road-load ripple phase-shifted pulse width modulation signals of N, and wherein N is power electronics
The concatenated power module number including redundant module, adjacent two-way phase-shifting carrier wave pulsewidth modulation are free of in transformer single-phase circuit
The phase shifting angle of signal is identical；
(2) controller of electric power electric transformer distributes the road-load ripple phase-shifted pulse width modulation signals of the N of generation in step (1)
To the series power module without N number of input state including redundant module and fault power module；
(3) controller of electric power electric transformer is monitored in real time to the working condition of N+m power model in circuit；
(4) controller of electric power electric transformer judges whether i-th of power model breaks down, 0<i≤N+m；If
There is no failure, then continue to inquire about the malfunction of next power model, until having inquired power model there occurs failure, then
Continue executing with next step；
(5) controller of electric power electric transformer judges now whether electric power electric transformer concatenated power circuit meets superfluous
Whether remaining fault-tolerant operation condition, i.e. fault power module number are not more than redundant module quantity m, if being unsatisfactory for redundancy fault-tolerant fortune
Row condition, then controller issue trip signal, electric power electric transformer concatenated power circuit system is shut down simultaneously out of service.If
Meet redundancy fault-tolerant service condition, then perform power model redundancy handover operation, the operating procedure specifically includes：
(5.1) controller of electric power electric transformer issues bypass instruction to fault power module, and by its running status
Stand-by state is switched to by input state；
(5.2) controller of electric power electric transformer issues input instruction to redundant module, by redundant module by standby shape
State switches to input state；
(5.3) the by-pass switch K of fault power modulepClosure, section breaker KfDisconnect, perform bypass instruction；
(5.4) H-bridge unit of fault power module and double active equal lockings of bridge series resonance-type DC-DC converter, i.e. institute
There is controllable type switching device to be performed both by open command；
(5.5) controller of electric power electric transformer sends out the primary H bridges pulse-width signal for delivering to fault power module
Redundant module is delivered to, the H-bridge unit of redundant module participates in modulating according to the pulse-width signal.
Above method can promote the use of three-phase power electronic transformer.
Claims (3)
1. a kind of electric power electric transformer concatenated power module redundancy fault tolerant control method, the list of described electric power electric transformer
Circuitry phase is connected and composed by N+m concatenated power module, and N and m are positive integer, electric power when wherein N is irredundant power model
Concatenated power module number needed for electronic transformer, m are redundant power module number；Each power model is by H-bridge circuit and double
Active bridge series resonance-type DC-DC converter composition, the transformer secondary output DC output side of each DC-DC converter are connected in parallel,
The primary DC side storage capacitor voltage of different DC-DC converters is enabled to realize automatic equalization, it is characterised in that：
The redundant fault-tolerant control method is in the case where meeting fault-tolerant operation condition, i.e., fault power module number is small in single-phase circuit
In or equal to m, one is reassigned to by fault power module bypass, and by the switching device trigger signal of fault power module
H-bridge unit in redundant power module, makes the smooth redundancy switching of electric power electric transformer, and specific steps include：
(1) controller of electric power electric transformer calculates the road-load ripple phase-shifted pulse width modulation signals of N, and wherein N is power electronics transformation
The concatenated power module number including redundant module, adjacent two-way phase-shifting carrier wave pulse-width signal are free of in device single-phase circuit
Phase shifting angle it is identical；
(2) controller of electric power electric transformer distributes to the road-load ripple phase-shifted pulse width modulation signals of N without redundant module and event
The series power module of N number of input state including barrier power model；
(3) controller of electric power electric transformer monitors the working condition of each power model in real time；
(4) during power model failure, the controller of electric power electric transformer is according to each power model real-time status identification of defective work(
Rate module；
(5) controller of electric power electric transformer judges whether electric power electric transformer meets redundancy fault-tolerant service condition, i.e. event
Whether barrier power model quantity is not more than redundant module quantity m, if meeting redundancy fault-tolerant service condition, power electronics transformation
The controller of device issues locking and bypass action command to fault power module, and input instruction is issued to redundant power module, will
Redundant power module switches to input state by stand-by state, and the H bridges pulse-width signal in fault power module is sent
To redundant power module；If fault power module number is more than redundant power module number m, redundancy fault-tolerant operation bar is unsatisfactory for
Part, then the controller of electric power electric transformer issue trip signal, electric power electric transformer is shut down simultaneously out of service.
2. electric power electric transformer concatenated power module redundancy fault tolerant control method according to claim 1, its feature exist
In：The controller of electric power electric transformer judges that electric power electric transformer concatenated power circuit meets that redundancy fault-tolerant is transported as mentioned
Row condition, specifically include the step of the power model redundancy handover operation of execution：
(1) controller of electric power electric transformer issues bypass instruction to fault power module, and by its running status by putting into
State switches to stand-by state；
(2) controller of electric power electric transformer issues input instruction to redundant module, and redundant module is switched by stand-by state
To put into state；
(3) the by-pass switch K of fault power modulepClosure, section breaker KfDisconnect, perform bypass instruction；
(4) H-bridge unit of fault power module and double active equal lockings of bridge series resonance-type DC-DC converter, i.e., it is all controllable
Type switching device is performed both by open command；
(5) controller of electric power electric transformer sends the primary H bridge pulse-width signals for delivering to fault power module to superfluous
The H-bridge unit of complementary modul block, the H-bridge unit of redundant module participate in modulating according to the pulse-width signal.
3. electric power electric transformer concatenated power module redundancy fault tolerant control method according to claim 1, its feature exist
In：The Cascade H bridge circuit of described electric power electric transformer high-voltage alternating side uses phase-shifting carrier wave formula pulse duration modulation method, and
All the time N number of power model is in input state, m redundant power module is in stand-by state；N number of work(in input state
H-bridge circuit uses phase-shifting carrier wave formula pulse duration modulation method in rate module；The H bridges of the m redundant power module in stand-by state
Circuit is in the on off state of output no-voltage；Once there is power model failure in N number of power model, must perform by locking
Road instruction is by fault power module bypass, while redundant power module switches to input state by stand-by state, and by output zero
The on off state of voltage switches to phase-shifting carrier wave formula sinusoidal pulse width modulation state so that there is N number of H-bridge circuit high-voltage alternating side all the time
Participate in pulsewidth modulation.
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| CN201710699518.2A CN107546844B (en) | 2017-08-16 | 2017-08-16 | Redundant fault-tolerant control method for cascaded power modules of power electronic transformer |
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|---|---|---|---|
| CN201710699518.2A CN107546844B (en) | 2017-08-16 | 2017-08-16 | Redundant fault-tolerant control method for cascaded power modules of power electronic transformer |
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| CN107546844B CN107546844B (en) | 2020-10-30 |
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| CN109039081A (en) * | 2018-06-20 | 2018-12-18 | 中国科学院电工研究所 | Electric power electric transformer, two-way DC converter and its control method |
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