CN109768721A - A kind of three-level current transformer control method of intelligence energy in bidirectional flow - Google Patents
A kind of three-level current transformer control method of intelligence energy in bidirectional flow Download PDFInfo
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- CN109768721A CN109768721A CN201811593401.7A CN201811593401A CN109768721A CN 109768721 A CN109768721 A CN 109768721A CN 201811593401 A CN201811593401 A CN 201811593401A CN 109768721 A CN109768721 A CN 109768721A
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Abstract
The invention discloses a kind of three-level current transformer control methods of intelligent energy in bidirectional flow, general control system is separately connected control system 1 and control system 2 by CAN bus, control system 1 passes through the connection triple chopper circuits of three-phase, control system 2 connects bidirectional three-level current transformer, the triple chopper circuits of three-phase connect bidirectional three-level current transformer, bidirectional three-level current transformer connects transformer by contactor, and transformer connects power grid.The invention has the advantages that: the reliability of the invention that rectifier can be improved, efficient, high power density and power factor is improved, total harmonic distortion factor is reduced, reduces costs, expanded application range；Improve the control performance of electrical equipment；Improve the security performance and conformability of electrical equipment.
Description
Technical field
The present invention relates to urban rail transit contact network technical field, the three of especially a kind of intelligent energy in bidirectional flow
Level current transformer control method.
Background technique
With greatly developing for city, urban population increases, and traffic becomes crowded, and urban track traffic have quickly,
Many advantages, such as freight volume is big, low noise, comfortable safe and efficient economy, energy conservation and environmental protection, has been increasingly becoming countries in the world and has solved increasingly
The first choice of serious urban transport problems.And greatly developing and building with urban rail transit in China, city rail traffic by
Short in its distance between sites, vehicle train operation density is again bigger, thus train can be generated in frequent starting, braking it is considerable
Regenerating braking energy, the braking energy generated according to statistics can reach the 20%-40% or more of energy needed for tractor-trailer train, part
The energy of regenerative braking can by Adjacent vehicles on route and Ben Che auxiliary electrical equipment absorb, extra regenerating braking energy then only
Vehicle-mounted resistance heating consumption or the consumption of air damping machinery can be converted into.Although it is extra again that vehicle-mounted braking resistor can play absorption
Raw braking energy and the limitation contact raised effect of network pressure, but its amount of heat generated distributes in subway tunnel, can make
Subway tunnel temperature increases.Its drawback is embodied in: on the one hand consuming regenerating braking energy in vain, electric energy is caused largely to waste；
On the other hand, tunnel temperature rise aggravates, and increases the electricity consumption of ventilation equipment；The contact fallen by train starting can't be stablized
Network pressure.
When train braking distance, when braking resistor cannot be completely consumed braking energy, filled if being absorbed without other
It sets to absorb these energy, these energy can feed back to DC grid, cause the raising of network voltage, this will affect direct current supply
The security performance of system, and then influence the normal operation of other trains.It can be seen that the regenerating braking energy that city railway vehicle generates
It is considerable, the aggravation of additional world energy sources crisis, therefore it is also of crucial importance to the research of regenerating braking energy absorption plant.
The absorption of regenerating braking energy at present is broadly divided into dissipation type, can present formula and three kinds of energy storage type.Wherein dissipation type is inhaled
Debit's formula can present formula and energy storage type using opposite since the advantages that its is simple and reliable for structure, good economy performance is most widely used
It is less.The research that technology is absorbed and utilized in the regenerating braking energy of external rail traffic is more early, has formed some products, and domestic
Research ability ground zero, nearly all use dissipation type absorption pattern, can not extra regenerating braking energy is effectively sharp
It uses.
1 dissipation type regenerating braking energy absorption pattern
Dissipation type regenerating braking energy absorption pattern is the regenerating braking energy extra by resistance consumption, in this braking
The braking mode of vehicle will be converted into resistive braking mode from braking mode under mode.The working principle of vehicular such as Fig. 1
Shown, shortcoming has: (1) each vehicle marshalling is equipped with the resistance of consumption energy, increases the weight of vehicle, is unfavorable for
The lightweight of vehicle, and increase the maintenance workload of vehicle；(2) excess energy is dissipated in the form of heat, causes energy
Amount waste, to weaken the meaning of regenerative braking to a certain extent.
2, energy storage type regenerating braking energy absorption pattern
Extra regenerating braking energy is absorbed using accumulator, can inhibit the raising of DC grid voltage；And it stores
Energy released at the time of vehicle accelerates and starts, while power grid can be given to provide voltage support, the energy of absorption obtains
Effective use can also prevent the network voltage drop range excessive.The energy storage technology that can be used for absorption and regeneration braking energy mainly has:
Battery energy storage, flywheel energy storage, superconducting energy storage and super capacitor energy-storage etc., foreign countries in conduct extensive research.
(1) battery energy storage
The electric power supply system for subway of battery energy storage regenerating braking energy absorption plant is as shown in Fig. 2, filling due to battery limited
The discharge cycles service life frequently opens the application of braking in rail traffic in this way, and service life falls short of, in addition a large amount of to use electricity
Pond pollutes the environment, therefore the use of battery energy storage system is much limited.
(2) flywheel energy storage
Flywheel energy storage system stores energy by the rotation of flywheel.When storing energy, the speed of flywheel is increased,
And when releasing energy, the speed of flywheel is reduced.Flywheel is driven when storing energy by motor, and in the Shi Youfei that releases energy
Wheel drives generator.It is connect by DC/AC converter with tractive power supply system, as shown in Figure 3.But flywheel is high speed rotation after all
Equipment, and closed environment and special manufacturing technology are used, service life and maintenanceability are worth further research, and the country does not have
There is related matured product.
(3) super capacitor energy-storage
The city rail tractive power supply system of super capacitor absorption and regeneration braking energy based on two-way DC/DC current transformer is such as
Shown in Fig. 4, the efficiency of supercapacitor charge and discharge is higher than other energy storage modes, can be simultaneously reached very high power density.It adopts
With super capacitor energy-storage in addition to can quick absorption and regeneration braking energy, additionally it is possible to net DC voltage be steadily contacted, and improve straight
Grid supply quality is flowed, can also continue to provide the energy of certain time, so that rail traffic vehicles be made to lack power grid power supply
In the case where, can emergency operating to platform.But it is expensive since super capacitor is bulky, and place capacity is small, it cannot
Meets the needs of fully absorbing regenerative electric energy, practical application is less.
3, inversion feedback type
Inversion feedback has two kinds of modes i.e. one kind to be fed back to middle-voltage network 10/35kV, and another kind is fed back to low-voltage distribution system
Unite 0.4kV, and the technological difficulties of (1) inversion feedback mechanisms have at high cost less economical, and the power quality of system feedback is lower, electric current
Harmonic wave is larger；(2) when energy feedback to low-voltage distribution system, due to individually standing, interior power consumption equipment capacity is smaller, the feedback mode
Biggish power rush will be generated in energy feedback can bring hidden danger to the safe operation of low-voltage distribution system, therefore inversion is returned
The electric energy of feedback only can be supplied to the load of less demanding to power quality；(3) its front end is diode rectification, due to diode rectification
For uncontrollable rectifier, energy can only one-way transmission, and the presence of the factors such as transformer leakage inductance, diode drop, line impedance can be led
It causes electric substation's output voltage as larger fluctuation occurs in the variation of train operation operating condition, keeps DC output voltage fluctuation range big；
(4) energy feedback is to middle-voltage network 10/35kV, and since system stability is poor, grid company is to regenerative braking energy feedback power grid
When power quality worry.
Therefore, it is necessary to propose a kind of three-level current transformer of intelligent energy in bidirectional flow in response to the above problems.
Summary of the invention
Object of the present invention is to overcome deficiency in the prior art, a kind of three electricity of intelligent energy in bidirectional flow are provided
Flat converter control method.
In order to solve the above-mentioned technical problem, the present invention is achieved through the following technical solutions:
A kind of three-level current transformer of intelligence energy in bidirectional flow, including general control system, control system 1, control system
System 2, the triple chopper circuits of three-phase, bidirectional three-level current transformer, contactor and transformer, the general control system are total by CAN
Line is separately connected control system 1 and control system 2, and the control system 1 passes through the connection triple chopper circuits of three-phase, the control
The connection bidirectional three-level current transformer of system 2, the triple chopper circuits connection bidirectional three-level current transformers of three-phase, described two-way three
Level current transformer connects transformer by contactor, and the transformer connects power grid.
Preferably, the triple chopper circuits of the three-phase include six the first choppers, and each first chopper wraps
Include the first IGBT and first diode.
Preferably, the collector of the first IGBT connects the emitter of the first IGBT by first diode.
Preferably, the emitter of the first IGBT is respectively connected with the first inductance.
Preferably, the bidirectional three-level current transformer includes three level current transformers, and each level current transformer wraps
Include four the second choppers.
Preferably, each second chopper includes the second diode and the 2nd IGBT, the collection of the 2nd IGBT
Electrode connects the emitter of the 2nd IGBT by the second diode.
A kind of three-level current transformer control method of intelligence energy in bidirectional flow, when municipal rail train is at traction fortune
When row, the voltage of direct current contact net can be reduced, and the energy that train needs at this time is supplied by power grid, and fax is transported to change by power grid
Depressor, transformer are transmitted to filter, and electrical transmission bidirectional three-level current transformer, bidirectional three-level current transformer are transmitted to by transformer
The triple buck circuits of three-phase, the triple buck circuits of three-phase are transmitted to municipal rail train by direct current contact net；
When control system 1 detects that (when contact net voltage is 1500V, detection voltage is reduced as low as 600V or so for voltage drop
Arrive 1200V or so), the upper bridge arm IGBT of the triple chopper circuits of three-phase is fully open, and three-level current transformer works in rectification state,
To power to direct current contact net, stable DC contact net voltage；
When municipal rail train is in on-position, direct current contact net voltage can be caused to go up, it at this time will be by energy feedback
To power grid: direct current contact net feeds back to the triple buck circuits of three-phase, and the triple buck circuits of three-phase feed back to two-way three
Level current transformer；Bidirectional three-level current transformer feeds back to filter；Bidirectional three-level current transformer feeds back to transformer；Transformer is anti-
It is fed to power grid, and then stablizes direct current contact net in a certain range；
When control system 1 detects that voltage is increased to 900V or so and (when contact net voltage is 1500V, detects voltage and increase
Arrive 1650V or so), the upper bridge arm IGBT of the triple chopper circuits of three-phase carries out buck chopper, and three-level current transformer works in inversion
State, by braking energy feedback to AC network, and then stable DC contact net voltage.
Preferably, control system 1 is by detecting the size of direct current contact net DC voltage, and then controls the triple decompressions of three-phase
Chopper circuit transmits size and the direction of energy；Control system 1 is transferred to control system by the signal that CAN bus will test
2, and then control the size and Orientation of bidirectional three-level current transformer transmission energy.
The invention has the advantages that: rectifier has can be improved in the present invention reliabilities, efficient, high power density and raising
Power factor, reduces total harmonic distortion factor, reduces costs, expanded application range；Improve the control of electrical equipment
Performance；Improve the security performance and conformability of electrical equipment；Promote the energy conservation and environmental protection and national economy of electrical equipment
Development etc., uses safety energy-conserving environment protection；Work is in inversion operating condition: the voltage and current of its feedback grid is close to sine wave, harmonic wave
Content is less, has the effect of reactive compensation concurrently, and its power factor to reduce the fluctuation of power grid, makes train close to " -1 "
It can smoothly run；
With power electronic technique, full-digital intelligent technology, the steady efficient operation of city railway vehicle locomotive is realized,
The significantly more efficient various special operation conditions for realizing city railway vehicle of three-level current transformer energy of intelligent energy in bidirectional flow, it is real
Now to the effective use of regeneration energy, meet city railway vehicle and start under moment and case of heavy load, the supplement of energy realizes energy
The two-way flow of amount realizes energy conservation and environmental protection, avoids the waste of the energy；Three-level current transformer is due to voltage change ratio and electricity simultaneously
So that electromagnetic interference problem greatly reduces, equivalent switching frequency is the half of two level current transformers for the reduction of rheology rate, from
And the volume of inductance capacitor element is effectively reduced, the volume and cost of device are thereby reduced, while reducing switch damage
Consumption.The working efficiency of city railway vehicle is not only increased in this way, and there are also high cost performance, domestic market has a high potential, and has
There is important social and economic significance.
It is described further below with reference to technical effect of the attached drawing to design of the invention, specific structure and generation, with
It is fully understood from the purpose of the present invention, feature and effect.
Detailed description of the invention
Fig. 1 is the vehicle-mounted resistance regenerating braking energy absorption plant schematic diagram of the prior art；
Fig. 2 is the battery energy storage regenerating braking energy absorption plant schematic diagram of the prior art；
Fig. 3 is the flywheel energy storage regenerating braking energy absorption plant schematic diagram of the prior art；
Fig. 4 is the super capacitor energy-storage regenerating braking energy absorption plant schematic diagram of the prior art；
Fig. 5 is the inverse type schematic diagram of the prior art；
Fig. 6 is the three-level current transformer schematic diagram of intelligent energy in bidirectional flow of the invention；
Working-flow figure when Fig. 7 is train braking of the invention；
Working-flow figure when Fig. 8 is launch train of the invention.
Specific embodiment
The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be defined by the claims
Implement with the multitude of different ways of covering.
As shown in Figure 6 to 8, a kind of three-level current transformer of intelligent energy in bidirectional flow, including general control system, control
System 1, control system 2, the triple chopper circuits of three-phase, bidirectional three-level current transformer, contactor and transformer processed, the master control
System is separately connected control system 1 and control system 2 by CAN bus, and the control system 1 passes through the connection triple copped waves of three-phase
Circuit, the control system 2 connect bidirectional three-level current transformer, and the triple chopper circuits of three-phase connect bidirectional three-level unsteady flow
Device, the bidirectional three-level current transformer connect transformer by contactor, and the transformer connects power grid.
Further, the triple chopper circuits of the three-phase include six the first choppers, and each first chopper is equal
Including the first IGBT and first diode, the collector of the first IGBT connects the transmitting of the first IGBT by first diode
Pole.
Wherein, the emitter of the first IGBT is respectively connected with the first inductance, and the bidirectional three-level current transformer includes three
A level current transformer, each level current transformer include four the second choppers.
In addition, each second chopper includes the second diode and the 2nd IGBT, the current collection of the 2nd IGBT
Pole connects the emitter of the 2nd IGBT by the second diode.
A kind of three-level current transformer control method of intelligence energy in bidirectional flow, when municipal rail train is at traction fortune
When row, the voltage of direct current contact net can be reduced, and the energy that train needs at this time is supplied by power grid, and fax is transported to change by power grid
Depressor, transformer are transmitted to filter, and electrical transmission bidirectional three-level current transformer, bidirectional three-level current transformer are transmitted to by transformer
The triple buck circuits of three-phase, the triple buck circuits of three-phase are transmitted to municipal rail train by direct current contact net；Work as control
System 1 detect voltage drop as low as 600V or so (contact net voltage be 1500V when, detect voltage drop as low as 1200V or so), three
The upper bridge arm IGBT of mutually triple chopper circuits is fully open, and three-level current transformer works in rectification state, gives direct current contact net
Power supply, stable DC contact net voltage；When municipal rail train is in on-position, direct current contact net voltage can be caused to go up, this
When energy will be fed back to power grid: direct current contact net feeds back to the triple buck circuits of three-phase, the triple buck choppers of three-phase
Electronic feedback is to bidirectional three-level current transformer；Bidirectional three-level current transformer feeds back to filter；Bidirectional three-level current transformer feedback
To transformer；Transformer feedback stablizes direct current contact net in a certain range to power grid；When control system 1 detects
Voltage is increased to 900V or so (when contact net voltage is 1500V, detection voltage is increased to 1650V or so), the triple copped waves of three-phase
The upper bridge arm IGBT of circuit carries out buck chopper, and three-level current transformer work is in inverter mode, by braking energy feedback to exchange
Power grid, and then stable DC contact net voltage.
Further, control system 1 is by detecting the size of direct current contact net DC voltage, and then controls the triple drops of three-phase
Press size and the direction of chopper circuit transmission energy；Control system 1 is transferred to control system by the signal that CAN bus will test
System 2, and then control the size and Orientation of bidirectional three-level current transformer transmission energy.
The present invention can be improved rectifier reliability, efficiently, high power density and improve power factor, reduce
Total harmonic distortion factor, reduces costs, has expanded application range；Improve the control performance of electrical equipment；It improves electrical
The security performance and conformability of equipment；The development etc. of the energy conservation and environmental protection and national economy of electrical equipment is promoted, use is safe
Energy conservation and environmental protection；Work is in inversion operating condition: for the voltage and current of its feedback grid close to sine wave, harmonic content is less, has nothing concurrently
The effect of function compensation, and its power factor to reduce the fluctuation of power grid, runs train smoothly close to " -1 ".
1, as shown in fig. 6, the three-level current transformer of intelligent energy in bidirectional flow is made of 4 parts, the triple drops of three-phase
Press chopper circuit, bidirectional three-level current transformer, transformer and control system composition.The triple chopper circuits of the three-phase of this system
The pressure stabilization function to direct current contact net may be implemented, bidirectional three-level current transformer may be implemented city railway vehicle braking energy and return
DC voltage needed for network voltage to be rectified into direct current contact net also may be implemented in transmission network, passes to fundamentally improve
System tractive power supply system energy unidirectional flow bring series of problems, effectively inhibits existing tractive power supply system to change in load
In the process and the voltage fluctuation problem under different operating condition (traction, braking), and then it is high to improve utilization rate of equipment and installations；
2, when municipal rail train is in running under power or starts, the voltage of direct current contact net can be reduced, and drop at this time
The voltage of lower part is supplied by the three-level current transformer of energy in bidirectional flow: power grid → transformer → filter → bidirectional three-level
The triple boost choppers of current transformer → three-phase → direct current contact net → municipal rail train；The triple boost choppers of three-phase can rise
To the effect of stable DC contact net voltage, simultaneously bi-directionally three-level current transformer work also has power density when rectifying operating condition
The advantages of height, input current sine, to guarantee the quality of power grid；
3, when municipal rail train is in on-position, direct current contact net voltage can be caused to go up, at this time energy in bidirectional flow
Three-level current transformer energy will be fed back to power grid: three electricity of the direct current contact net → triple buck circuits of three-phase → two-way
Flat current transformer → filter → transformer → power grid, and then stablize direct current contact net in a certain range；
4, the high-power converter of three level of energy in bidirectional flow has the arbitrarily adjustable ability of power factor, can be effectively
Power factor is relatively low between solving the problems, such as middle-voltage network non-peak period, improves the power factor of system, and then can replace dedicated
Reactive power compensator；
5, the triple chopper circuits of two-way three-phase work in pressure-increasning state, work at the same time when municipal rail train starts
Constant voltage mode provides steady dc voltage and gives D.C. contactor net；When municipal rail train braking, work is in decompression shape
State exports steady dc voltage to three-level current transformer；
6, the state of control system 1 and control system 2 according to detection power grid, direct current contact net, the fortune according to municipal rail train
The instructions starting intelligent high-efficiency operation such as row state and operation stopping, adjust automatically distribution power, while two control systems can
Directly to exchange data, adjust automatically intelligence operation by CAN bus；Total control system can also be passed through, to coordinate two
The effective and reasonable operation of a control system；
7, control system 1 is by detecting the size of direct current contact net DC voltage, and then controls the two-way triple copped waves of three-phase
The size of circuit transmission energy and direction；Control system 1 is transferred to control system 2 by the signal that CAN bus will test, into
And control the size and Orientation of bidirectional three-level current transformer transmission energy；
8, the operating status and data obtained of control system 1 and control system 2 are transferred to master control by CAN bus
System, by the efficient and rational orderly operation of general control system coordinated control system 1 and control system 2, while general control system
With wire and wireless functional module, it is able to carry out intelligent recognition, locating and tracking, fault diagnosis.；
9, by reasonable control strategy, the three-level current transformer power supply system of intelligent energy in bidirectional flow can be completed to hand over
The harmonics restraint and no-power compensation function of galvanic electricity net, improve the performance of tractive power supply system；Different works can also effectively be dealt with
Make situation and adverse circumstances, automatic adaptive adjusts power distribution, always works in the three-level current transformer of two-way flow most
High operational efficiency, does not use excessively, protects the service life of electrical equipment.Especially during regenerative braking, Bu Huila
Low network voltage also improves the service life of electrical equipment, reduces failure classes, energy conservation and environmental protection.
It is real compared with prior art the present invention has the advantages that with power electronic technique, full-digital intelligent technology
The three-level current transformer of the existing steady efficient operation of city railway vehicle locomotive, intelligent energy in bidirectional flow can significantly more efficient reality
The various special operation conditions of existing city railway vehicle, realize the effective use to regeneration energy, meet city railway vehicle and start wink
Between and case of heavy load under, the supplement of energy realizes the two-way flow of energy, realizes energy conservation and environmental protection, avoids the waste of the energy；Together
When three-level current transformer since the reduction of voltage change ratio and current changing rate is so that electromagnetic interference problem greatly reduces, it is equivalent
Switching frequency is that the half of two level current transformers thereby reduces dress to effectively reduce the volume of inductance capacitor element
The volume and cost set, while reducing switching loss.The working efficiency of city railway vehicle is not only increased in this way, and there are also poles
High cost performance, domestic market have a high potential, and have important social and economic significance.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be within the scope of protection determined by the claims.
Claims (8)
1. a kind of three-level current transformer of intelligence energy in bidirectional flow, it is characterised in that: including general control system, control system
1, the triple chopper circuits of control system 2, three-phase, bidirectional three-level current transformer, contactor and transformer, the general control system are logical
It crosses CAN bus and is separately connected control system 1 and control system 2, the control system 1 passes through the connection triple chopper circuits of three-phase,
The control system 2 connects bidirectional three-level current transformer, and the triple chopper circuits of three-phase connect bidirectional three-level current transformer, institute
It states bidirectional three-level current transformer and transformer is connected by contactor, the transformer connects power grid.
2. a kind of three-level current transformer of intelligent energy in bidirectional flow as described in claim 1, it is characterised in that: described three
Mutually triple chopper circuits include six the first choppers, and each first chopper includes the first IGBT and the one or two pole
Pipe.
3. a kind of three-level current transformer of intelligent energy in bidirectional flow as claimed in claim 2, it is characterised in that: described the
The collector of one IGBT connects the emitter of the first IGBT by first diode.
4. a kind of three-level current transformer of intelligent energy in bidirectional flow as claimed in claim 3, it is characterised in that: described the
The emitter of one IGBT is respectively connected with the first inductance.
5. a kind of three-level current transformer of intelligent energy in bidirectional flow as described in claim 1, it is characterised in that: described double
It include three level current transformers to three-level current transformer, each level current transformer includes four the second choppers.
6. a kind of three-level current transformer of intelligent energy in bidirectional flow as claimed in claim 5, it is characterised in that: Mei Gesuo
Stating the second chopper includes the second diode and the 2nd IGBT, and the collector of the 2nd IGBT is connected by the second diode
The emitter of 2nd IGBT.
7. a kind of control for the three-level current transformer for being used in a kind of any intelligent energy in bidirectional flow of claim 1-6
Method processed, it is characterised in that: when municipal rail train is at running under power, the voltage of direct current contact net can be reduced, this
When train need energy supplied by power grid, fax is transported to transformer by power grid, and transformer is transmitted to filter, and transformer will be electric
Bidirectional three-level current transformer is transmitted, bidirectional three-level current transformer is transmitted to the triple buck circuits of three-phase, the triple decompressions of three-phase
Chopper circuit is transmitted to municipal rail train by direct current contact net；
When control system 1 detects voltage drop as low as 600V or so, the upper bridge arm IGBT of the triple chopper circuits of three-phase is fully open,
Three-level current transformer work is powered in rectification state to direct current contact net, stable DC contact net voltage；
When municipal rail train is in on-position, direct current contact net voltage can be caused to go up, energy will be fed back to electricity at this time
Net: direct current contact net feeds back to the triple buck circuits of three-phase, and the triple buck circuits of three-phase feed back to bidirectional three-level
Current transformer；Bidirectional three-level current transformer feeds back to filter；Bidirectional three-level current transformer feeds back to transformer；Transformer feedback is extremely
Power grid, and then stablize direct current contact net in a certain range；
When control system 1 detects that voltage is increased to 900V or so, the upper bridge arm IGBT of the triple chopper circuits of three-phase is depressured
Copped wave, three-level current transformer work is in inverter mode, and by braking energy feedback to AC network, and then stable DC contact net is electric
Pressure.
8. a kind of three-level current transformer control method of intelligent energy in bidirectional flow as claimed in claim 7, feature exist
In: control system 1 controls the triple buck circuits transmission of three-phase by detecting the size of direct current contact net DC voltage
The size of energy and direction；Control system 1 is transferred to control system 2 by the signal that CAN bus will test, and then controls double
To the size and Orientation of three-level current transformer transmission energy.
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| CN111775973A (en) * | 2020-06-21 | 2020-10-16 | 中车永济电机有限公司 | Locomotive power supply system and control method thereof |
| CN111775972A (en) * | 2020-06-21 | 2020-10-16 | 中车永济电机有限公司 | High-reliability locomotive electric transmission system and control method thereof |
| CN111775972B (en) * | 2020-06-21 | 2021-06-22 | 中车永济电机有限公司 | High-reliability locomotive electric transmission system and control method thereof |
| CN111775973B (en) * | 2020-06-21 | 2021-06-22 | 中车永济电机有限公司 | Locomotive power supply system and control method thereof |
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Application publication date: 20190517 |