CN103746592B - Two-way inversion system and two-way inverter circuit - Google Patents
Two-way inversion system and two-way inverter circuit Download PDFInfo
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- CN103746592B CN103746592B CN201310753755.4A CN201310753755A CN103746592B CN 103746592 B CN103746592 B CN 103746592B CN 201310753755 A CN201310753755 A CN 201310753755A CN 103746592 B CN103746592 B CN 103746592B
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Abstract
The invention provides a kind of two-way inversion system and two-way inverter circuit.The two-way inversion system includes：Three-phase inverter, including controller, the first power conversion modules, the second power conversion modules and the 3rd power conversion modules, controller the power supply capacity and loading condition of the two-way inversion system meet it is pre-conditioned in the case of control at least one of first power conversion modules, second power conversion modules and the 3rd power conversion modules power conversion modules mode of operation be different from other power conversion modules mode of operation；Energy-storage units, are connected with the direct current component of three-phase inverter, for storing the direct current of three-phase inverter or for three-phase inverter provides direct current；Single-phase of generating electricity equipment, single-phase circuit connection corresponding with the first power conversion modules, for providing electric energy for single-phase circuit.Two-way inversion system of the invention can be in normal work under three-phase imbalance load.
Description
Technical field
The present invention relates to circuit field, more particularly, to a kind of two-way inversion system and two-way inverter circuit.Background technology
In recent years, distributed power generation relied on its reliability and economy, and pollution less, reliability is high, using energy source
The characteristics of efficiency high, has obtained development at full speed.Micro-capacitance sensor (Micro Grid, MG) is by distributed power generation (Distributed
Generation, DG) system, energy-storage system and load composition miniature power network, as needed may be selected it is grid-connected with power distribution network
Operation also may be selected independent operating.
Energy-storage system mainly includes energy storage inverter and energy-storage units.The major function of energy storage inverter is to realize alternating current
Two-way energy transfer between net electric energy and energy-storage units electric energy.Energy-storage units can be DC energy storage unit, such as super capacitor
Device group, batteries, flying wheel battery etc., major power are storage electric energy and provide direct current.Energy-storage system not only can be quick
The fluctuation for stabilizing the random electric energy of distributed generation system or trend is effectively realized, power network is improved to extensive development of renewable energy
Electricity（Wind energy, photovoltaic）Receiving ability, and dispatch command can be received, receive or supplement the peak valley electric energy of power network, and provide
Reactive power, to improve the power supply quality and economic benefit of power network.In electric network fault or power failure, energy-storage system is also equipped with independence
Networking function of supplying power, to improve the Supply Security of load.
However, the load balance of conventional energy storage inversion system requirement three-phase circuit, therefore, it is impossible in three-phase imbalance load
Lower normal work.
The content of the invention
The embodiment provides a kind of two-way inversion system and two-way inverter circuit, can be negative in three-phase imbalance
Carry lower normal work.
A kind of first aspect, there is provided two-way inversion system, including：Three-phase inverter, for being converted into direct current to become
Stream electricity converts alternating current to direct current, and three-phase inverter includes that controller, the first power conversion modules, the second power become
Mold changing block and the 3rd power conversion modules, controller are used to meet default in the power supply capacity and loading condition of two-way inversion system
At least one in the first power conversion modules, the second power conversion modules and the 3rd power conversion modules is controlled in the case of condition
The mode of operation of individual power conversion modules is different from the mode of operation of other power conversion modules, and mode of operation includes：Stop work
Make, converting direct-current power into alternating-current power and alternating current are converted into direct current；Energy-storage units, are connected with the direct current component of three-phase inverter
Connect, for storing the direct current of three-phase inverter or for three-phase inverter provides direct current；At least one single-phase of generating electricity equipment, with
At least one of the three-phase circuit of two-way inversion system single-phase circuit is connected, for providing electricity for two-way inversion system
Can, three-phase circuit is corresponding with the first power conversion modules, the second power conversion modules and the 3rd power conversion modules respectively,
For providing electric energy at least one load.
Under the first possible implementation, three-phase inverter also includes：First isolating transformer, the second isolation transformation
Device and the 3rd isolating transformer, are connected in series in the first power conversion modules, the second power conversion modules and the 3rd power respectively
On the corresponding single-phase circuit of conversion module.
With reference to first aspect or the first possible implementation, under second possible implementation, two-way inversion
System also includes：At least one switch, is connected between at least one load and the three-phase circuit of three-phase inverter, controls
Device is additionally operable to turning on and off for the switch of control at least one, to connect or cut off at least one load.
With reference to second possible implementation, under the third possible implementation, at least one switch is included extremely
One single-phase switch, is connected between at least one load and the single-phase circuit of three-phase inverter, and controller is additionally operable to control
Turning on and off at least one single-phase switch is made, to connect or cut off at least one single-phase load.
With reference to second possible implementation, under the 4th kind of possible implementation, at least one switch includes：Extremely
One threephase switch, is connected between threephase load and the three-phase circuit of three-phase inverter, and controller is additionally operable to control extremely
Lack turning on and off for threephase switch, to connect or cut off threephase load.
With reference to the 4th kind of possible implementation, under the 5th kind of possible implementation, two-way inversion system also includes：
Extension switch board, the control signal for receiving controller, and control turning on and off at least one switch.
With reference to any of the above-described kind of possible implementation, under the 6th kind of possible implementation, at least one single-phase hair
Electric equipment includes the first single-phase of generating electricity equipment, and the first single-phase of generating electricity equipment connects the corresponding single-phase electricity of the first power conversion modules
Road.
With reference to the 6th kind of possible implementation, under the 7th kind of possible implementation, at least one load includes single
The load of phase load, threephase load and high priority, the load of high priority single-phase electricity corresponding with the first power conversion modules
Road connects.
With reference to the 7th kind of possible implementation, under the 8th kind of possible implementation, controller is used for two-way inverse
When becoming system power supply scarce capacity, load is cut off according to the sequencing of the load of single-phase load, threephase load and high priority.
With reference to any one in the 6th kind to the 8th kind possible implementation, under the 9th kind of possible implementation,
When the first single-phase of generating electricity equipment does not work, the second power conversion modules of control and the 3rd power conversion modules stop work to controller
Make.
With reference to any one in the 6th kind to the 9th kind possible implementation, under the tenth kind of possible implementation,
Controller when the first single-phase of generating electricity equipment works and energy-storage units electricity be less than first threshold when, control the first power conversion
Module converts alternating current to direct current, and controls the second power conversion modules and the 3rd power conversion modules to turn direct current
Change alternating current into.
With reference to any one in the 6th kind to the tenth kind possible implementation, in a kind of the tenth possible implementation
Under, controller controls the first power when the electricity of the work of single-phase of generating electricity equipment and energy-storage units is more than or equal to first threshold
Conversion module, the second power conversion modules and the 3rd power conversion modules are by converting direct-current power into alternating-current power.
A kind of second aspect, there is provided two-way inverter circuit, including：First power conversion modules, the second power conversion mould
Block and the 3rd power conversion modules, for direct current to be converted into unsteady flow electricity or direct current is converted alternating current to；Controller,
Two-way inversion system power supply capacity and loading condition meet it is pre-conditioned in the case of control the first power conversion modules
Mode of operation is different from the work of at least one of the second power conversion modules and the 3rd power conversion modules power conversion modules
Operation mode, mode of operation includes：It is stopped, converting direct-current power into alternating-current power and alternating current are converted into direct current.
Under the first possible implementation, three-phase inverter also includes：First isolating transformer, the second isolation transformation
Device and the 3rd isolating transformer, are connected in series in the first power conversion modules, the second power conversion modules and the 3rd power respectively
On the corresponding single-phase circuit of conversion module.
In the above-mentioned technical solutions, can be according to the power supply capacity of two-way inversion system and loading condition control three phase power
Conversion module is operated under different mode of operations so that three phase power conversion module can be relatively independently three-phase alternating current
The load of each single-phase circuit in road provides electric energy such that it is able to the normal work under three-phase imbalance load.
Brief description of the drawings
Technical scheme in order to illustrate more clearly the embodiments of the present invention, below will be to that will make needed for the embodiment of the present invention
Accompanying drawing is briefly described, it should be apparent that, drawings described below is only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 shows the circuit block diagram of two-way inversion system according to an embodiment of the invention.
Fig. 2 is the circuit diagram of the three-phase inverter of Fig. 1.
Fig. 3 is the schematic circuit of two-way inversion system according to another embodiment of the present invention.
Fig. 4 is the schematic circuit of three phase network system according to still another embodiment of the invention.
Fig. 5 is the schematic circuit of two-way inverter circuit a kind of according to an embodiment of the invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is a part of embodiment of the invention, rather than whole embodiments.Based on this hair
Embodiment in bright, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
Fig. 1 shows the circuit block diagram of two-way inversion system 100 according to an embodiment of the invention.Two-way contravariant system
System 100 includes three-phase inverter 110, at least one single-phase of generating electricity equipment 120 and energy-storage units 130.
Three-phase inverter 110 is used to for direct current to be converted into unsteady flow electricity or converts alternating current to direct current, three contraries
Becoming device 110 includes controller 114, the first power conversion modules 111, the second power conversion modules 112 and the 3rd power conversion mould
Block 113, controller 114 the power supply capacity and loading condition of two-way inversion system meet it is pre-conditioned in the case of control first
The work of at least one of power conversion modules, the second power conversion modules and the 3rd power conversion modules power conversion modules
Pattern is different from the mode of operation of other power conversion modules, and mode of operation includes：Be stopped, converting direct-current power into alternating-current power
Direct current is converted into alternating current.
In other words, controller 114 can be according to the power supply capacity of two-way inversion system 100 and loading condition control first
Power conversion modules 111, the second power conversion modules 112 and the 3rd power conversion modules 113 are independently operated in above-mentioned three kinds
One of mode of operation.Any two power conversion modules in above three power conversion modules can be according to two-way inversion system
Power supply capacity and loading condition control these power conversion modules to be operated under identical or different mode of operation.Above three
Power conversion modules can also respectively be operated under above-mentioned three kinds of mode of operations or while be operated under identical mode of operation.
Energy-storage units 130 are connected with the direct current component of three-phase inverter 110, for storing the straight of three-phase inverter 110
Stream electricity is the offer direct current of three-phase inverter 110.
In at least one single-phase of generating electricity equipment 120 and three-phase circuit A, B, C of two-way inversion system 100 at least one
The connection of individual single-phase circuit, for being the offer electric energy of two-way inversion system 100, three-phase circuit A, B, C respectively with the first power
Conversion module 111, second power conversion modules 112 and the correspondence of the 3rd power conversion modules 113, for at least one negative
Carry 140 and 150 and electric energy is provided.
Single-phase of generating electricity equipment 120 can be small generator（For example, single-phase diesel-driven generator）.For example, single-phase diesel oil hair
Chemical energy in diesel oil can be converted to mechanical energy by motor, and drive alternator shaft to rotate, so as to produce AC energy.It is single
Phase generating equipment can also be bioenergy power generation equipment or other chemical energy（For example, coal-fired）Generating equipment.Implementation of the invention
Example is not limited to this, for example, single-phase of generating electricity equipment 120 may also be photovoltaic array or wind-power electricity generation or fuel cell or energy storage electricity
Pond, and photovoltaic array or wind-power electricity generation or fuel cell or energy-storage battery can be by single-phase grid-connected inverter and single-phase electricities
Road connects.
Specifically, controller 114 can be according to the power supply capacity of two-way inversion system 100 and loading condition control first
The mode of operation of power conversion modules 111, the second power conversion modules 112 and the 3rd power conversion modules 113.For example, when single
The power supply capacity of the A circuitry phases where phase generating equipment 120 is more than the current electricity needs for mounting load of the A circuitry phases
In the case of, the first power conversion modules 111 of control of controller 114 are operated in alternating current and are converted under galvanic mode of operation,
So that the dump energy that single-phase of generating electricity equipment 120 is produced is supplied to energy-storage units 130 by the first power conversion modules 111, control
Device processed 114 can also control the second power conversion modules 112 to be operated under the mode of operation of converting direct-current power into alternating-current power, so as to
The direct current that energy-storage units 130 or single-phase of generating electricity equipment 130 are provided is changed into alternating current and is supplied to B circuitry phases, and controlled
3rd power conversion modules 113 are operated under the mode of operation of converting direct-current power into alternating-current power, so as to by energy-storage units 130 or
The direct current that single-phase of generating electricity equipment 130 is provided changes into alternating current and is supplied to C circuitry phases.Or, when needing to cut off single-phase circuit
Load（Load i.e. on the single-phase circuit is without power supply）When, single-phase power conversion module can be controlled to be in the work being stopped
Operation mode.For example, when the load 150 connected on B circuitry phases is cut off, the second power conversion can be controlled with controller 114
Module 112 is in the mode of operation being stopped.
Embodiments in accordance with the present invention, can be according to the power supply capacity of two-way inversion system and loading condition control three-phase work(
Rate conversion module is operated under different mode of operations so that three phase power conversion module can be relatively independently three-phase alternating current
The load of each single-phase circuit in circuit provides electric energy such that it is able to so that two-way inversion system is under three-phase imbalance load
Normal work.
Fig. 2 is the circuit diagram of the three-phase inverter 110 of Fig. 1.Referring to Fig. 2, three-phase inverter 110 also includes：First isolation
Transformer Ta, the second isolating transformer Tb and the 3rd isolating transformer Tc, are connected in series in the first power conversion modules respectively
111st, on 113 pieces of corresponding single-phase circuits of the second power conversion modules 112 and the 3rd power conversion mould.
To realize the unbalanced load of three-phase 100%, the three-phase energy storage inverter described in embodiments of the invention is in A, B, C phase
Three independent isolating transformer Ta, Tb, Tc are added between power conversion modules and three-phase circuit.Due to each isolation
Transformer is relatively independent, thus in the absence of the coupling of three-phase magnetic circuit such that it is able to realize the unbalanced load work(of threephase load 100%
Energy.Here, the unbalanced load of threephase load 100% refers to that the load mounted on three-phase circuit is asymmetric, such as A, B, C tri-
The load of a certain phase in intersecting current circuit is 0, and the load of other two-phases is nominal load.
Alternatively, three-phase inverter 110 can be connected by dc bus BUS+ and BUS- with energy-storage units.Direct current
Electric capacity C can also be connected between bus BUS+ and BUS-, for example, also referred to as dc bus Support Capacitor, electric capacity C can be played
The effect of charge or discharge.For example, when the power conversion modules 111 of controller 114 first carry out alternating current to galvanic conversion
When, electric capacity C can charge, while when controller 114 controls the second power conversion modules 112 and/or the 3rd power conversion modules
113 carry out direct current to alternating current conversion when, electric capacity can discharge, to be that B circuitry phases and C circuitry phases provide electric energy, from
And directly to provide electric energy on B circuitry phases and C circuitry phases when enabling to the electric energy on single-phase circuit A remaining, and without to storage
Energy unit 130 is charged and discharged, and can so improve the efficiency of energy conversion, and improves the service life of energy-storage units.
Alternately, as another embodiment, the first power conversion modules 111, the second power conversion modules 112 and the 3rd
Power conversion modules 113 directly can be connected with A circuitry phases, B circuitry phases and C circuitry phases respectively.In this case, due to
Isolating transformer can be omitted, it is thus possible to reduce the cost of three-phase inverter.
Alternatively, as another embodiment, three-phase inverter 110 also includes：At least one switch, is connected at least
One load and the three-phase circuit of three-phase inverter 110 between, controller 114 be additionally operable to control at least one switch connection and
Shut-off, to connect or cut off at least one load.For example, at least one switch can be relay, contactor or other controls
Switch element.
Embodiments in accordance with the present invention, at least one switch is including to a single-phase switch, being connected at least one
Between load and the single-phase circuit of three-phase inverter, controller is additionally operable to control turning on and off at least one single-phase switch,
To connect or cut off at least one single-phase load.
Embodiments in accordance with the present invention, at least one switch includes：To a threephase switch, threephase load is connected to
And the three-phase circuit of three-phase inverter between, controller is additionally operable to control turning on and off at least threephase switch, connecting or
Excision threephase load.It should be understood that above-mentioned threephase switch can also be three single-phase switch is combined into a form for threephase switch.
Alternatively, as another embodiment, three-phase inverter 110 also includes：Extension switch board, for receiving controller
Control signal, and control at least one to switch.
Embodiments in accordance with the present invention, above-mentioned at least one single-phase of generating electricity equipment 120 includes the first single-phase of generating electricity equipment, the
One single-phase of generating electricity equipment connects the corresponding single-phase circuit of the first power conversion modules.
Embodiments in accordance with the present invention, above-mentioned at least one load includes single-phase load, threephase load and high priority
Load, the load of high priority single-phase circuit connection corresponding with the first power conversion modules.The load of high priority can refer to
Visual plant, for example, the equipment that the place such as hospital, school needs continual and steady power supply.
Embodiments in accordance with the present invention, controller 114 is used for when the power supply capacity of two-way inversion system 100 is not enough, according to
The sequencing excision load of the load of single-phase load, threephase load and high priority.According to pre- during system energy insufficient supply
The rule classification excision load for first setting, realizes the stable operation of system.
Embodiments in accordance with the present invention, when the first single-phase of generating electricity equipment does not work, the second power of control becomes controller 114
Mold changing block and the 3rd power conversion modules are stopped.
For example, because the first single-phase of generating electricity equipment does not work, and mounted high priority in the first single-phase of generating electricity equipment
Load, therefore, it can the second power conversion modules of control and the 3rd power conversion modules are stopped, to stop as the two work(
Load supplying on the corresponding single-phase circuit of rate conversion module, so as to ensure the need for electricity of the load of high priority.
Embodiments in accordance with the present invention, controller 114 when the first single-phase of generating electricity equipment works and energy-storage units electricity
During less than first threshold, the first power conversion modules of control convert alternating current to direct current, and control the second power conversion
Module and the 3rd power conversion modules are by converting direct-current power into alternating-current power.
When the electricity of energy-storage units is less than first threshold, at this moment the not enough power supply of energy-storage units can change alternating current
Into direct current, to be charged to energy-storage units.
Embodiments in accordance with the present invention, controller the first single-phase of generating electricity equipment work and energy-storage units electricity be more than or
During equal to first threshold, the first power conversion modules, the second power conversion modules and the 3rd power conversion modules are controlled by direct current
Electricity is converted into alternating current.
When the electricity of energy-storage units is more than or equal to first threshold, the electricity of energy-storage units is sufficient, at this moment can directly
Stream electricity is converted into alternating current, to provide electric energy for load.
Fig. 3 is the schematic circuit of two-way inversion system 300 according to another embodiment of the present invention.Fig. 3 is two-way inverse
Change system 300 is the example of the embodiment of Fig. 1.Two-way inversion system 300 includes three-phase inverter 310, single-phase of generating electricity equipment 320
350 are loaded with energy-storage units 330, threephase load 340, single-phase load A, single-phase load B, single-phase load C, high priority and open
Close K1 to K8.Three-phase inverter 310 is similar with the three-phase inverter 110 of Fig. 1, will not be repeated here.
Three-phase inverter 310 is used to carry out energy conversion between energy-storage units 330 and three-phase circuit A, B, C, will store up
Converting direct-current power into alternating-current power in energy unit 330 is supplied to three-phase circuit A, B, C or the alternating current by three-phase circuit A, B, C
Direct current can be converted into and be supplied to energy-storage units.Single-phase of generating electricity equipment 320 connects A circuitry phases.Single-phase load A by switch K1 and
Switch K5 connection A circuitry phases, single-phase load B connects B circuitry phases by switching K2, and single-phase load C connects C phases electricity by switching K3
Road.High priority load 350 connects A circuitry phases by switching K1.Threephase load 340 by threephase switch K4 and switch K1,
Switch K2 and switch K3 connection three-phase circuits A, B, C.In other words, switch K1 and switch K5 are connected in series in A circuitry phases and list
It is single-phase for connecting single-phase load A or excision unloading under the control of the controller 311 of three-phase inverter 310 between phase load A
Load A, switch K2 is connected between B circuitry phases and single-phase load B, for the control of the controller 311 in three-phase inverter 310
Lower connection single-phase load B or excision unloading single-phase load B, switch K3 be connected between C circuitry phases and single-phase load C, for
Single-phase load C or excision unloading single-phase load C is connected under the control of the controller 311 of three-phase inverter 310.Switch K1 is connected to
It is high preferential for being connected under the control of the controller 311 of three-phase inverter 310 between A circuitry phases and high priority load 350
The load 350 of level or the load 350 of excision unloading high priority.
For example, when the power supply capacity of two-way inversion system 300 is not enough, is cut off by following order and loaded：Cut off first
Single-phase load A, B, C, are then sliced out threephase load 340, finally cut off high priority load 350.For example, being closed by making switch K5
Break and cut off single-phase load A, single-phase load B is cut off by turning off switch K2, cut off single-phase by turning off switch K3
Load C.Threephase load 340 is cut off by turning off switch K4.Preferential load 350 high is cut off by turning off K1.
It should be understood that single-phase of generating electricity equipment 320 is not limited to above-described embodiment with the connection of single-phase circuit, for example, single-phase hair
Electric equipment 320 can also be connected with B circuitry phases or C circuitry phases.Three single-phase circuits can respectively connect three single-phase of generating electricity and set
Standby 320.
In addition, load is not limited to above-described embodiment connected mode with the connection of single-phase circuit, for example, single-phase load A also may be used
It is connected with B circuitry phases, single-phase load B can also be connected with C circuitry phases, single-phase load C can also be connected with A circuitry phases, it is high
Priority load 350 can also be connected with B circuitry phases or C circuitry phases.
Fig. 4 is the schematic circuit of three phase network system 400 according to still another embodiment of the invention.The three-phase of Fig. 4
Network system 400 is Fig. 1 to the example of inversion system, detailed description is suitably omitted herein.
Three phase network system 400 includes three-phase inverter（Also referred to as three-phase energy storage inverter）410th, diesel-driven generator 420,
The load 450 of battery 430, single-phase load A, B, C and threephase load 440, high priority, single-phase grid-connected inverter 480, photovoltaic battle array
Row or wind power plant or fuel cell or energy-storage battery 490, other generating equipments or system 460, extension switch board 470 with
And switch K1 to K8.
The single-phase circuit or polyphase circuit of three phase network system can respectively mount single-phase of generating electricity equipment.For example, in Fig. 4
In, single-phase diesel-driven generator is articulated in the single-phase circuit of three phase network system（For example, A phases）On.Three-phase energy storage inverter to A,
While B, C circuitry phase are powered, can also be single-phase grid-connected inverter 480 provide can be grid-connected voltage source.For example, photovoltaic array
Or wind power plant or fuel cell or energy-storage battery 490 can be connected to single-phase circuit by single-phase grid-connected inverter 480
（For example, A phases）.In addition, three phase network system can also mount other generating equipments or system 460, for example, being connected with power distribution network
Connect, for being powered to power distribution network or obtaining electric energy from power distribution network.
Three-phase inverter 410 is used to carry out energy conversion between energy-storage units 430 and three-phase circuit A, B, C, will store up
Converting direct-current power into alternating-current power in energy unit 430 is supplied to three-phase circuit A, B, C or the alternating current by three-phase circuit A, B, C
Direct current can be converted into and be supplied to energy-storage units.Single-phase of generating electricity equipment 420 connects A circuitry phases.Single-phase load A by switch K1 and
Switch K5 connection A circuitry phases, single-phase load B by switch K2 and switch K6 connect B circuitry phases, single-phase load C by switch K3,
Switch K7 connection C circuitry phases.High priority load 450 connects A circuitry phases by switching K1, switch K8.Threephase load 440 passes through
Threephase switch K4 and switch K1, switch K2 and switch K3 connection three-phase circuits A, B, C.In other words, switch K1 and switch K5
It is connected in series between A circuitry phases and single-phase load A, for connecting single under the control of the controller 411 of three-phase inverter 410
Phase load A or excision unloading single-phase load A, switch K2 and switch K6 are connected in series between B circuitry phases and single-phase load B, are used
In under the control in the controller 411 of three-phase inverter 410 connect single-phase load B or excision unloading single-phase load B, switch K3 and
Switch K7 is connected in series between C circuitry phases and single-phase load C, under the control of the controller 411 of three-phase inverter 410
Connect single-phase load C or excision unloading single-phase load C.Switch K1 and switch K8 are connected in series in A circuitry phases and are born with high priority
Carry between 450, for connecting high priority load 450 or excision unloading under the control of the controller 411 of three-phase inverter 410
High priority load 450.
For example, when the power supply capacity of two-way inversion system 400 is not enough, is cut off by following order and loaded：Cut off first
Single-phase load A, B, C, are then sliced out threephase load 440, finally cut off the load 450 of high priority.For example, by making switch K5
Turn off and cut off single-phase load B, single-phase load B is cut off by turning off switch K6, cut off single by turning off switch K7
Phase load C.Threephase load 440 is cut off by turning off switch K4.Preferential load 450 high is cut off by turning off K8.
All loads that switch K1, switch K2 and switch K3 are used on cut-out single-phase circuit respectively.
The controller 414 of three-phase energy storage inverter 410 can be according to size, the electricity of battery 430, the single-phase of generating electricity of load
Equipment（For example, diesel-driven generator 420）Power situation control each phase power conversion modules and switch K1 to K8 according to as follows
Mode works.
When the not enough power supply of battery 430（I.e. the electricity of battery 430 is less than first threshold）When, single-phase of generating electricity equipment（For example,
Diesel-driven generator machine）420 work, export larger power, and diesel-driven generator machine 420 is powered to single-phase load A, while passing through three
The A phases input of phase energy storage inverter 410 provides power supply and phase to three-phase energy storage inverter 410.Three-phase energy storage inverter 410
A phases the energy that diesel-driven generator machine 420 is exported is rectified to dc bus, realize the charging to battery.Wherein dc bus
Upper to include dc bus Support Capacitor, dc bus Support Capacitor can storage energy, the B phases and C phases of three-phase energy storage inverter 410
Energy is obtained from dc bus Support Capacitor, realizes that DC/AC is converted, and exported in voltage source form, B phases and C phases phase are divided
120 ° and 240 ° are not fallen behind than the phase that A phases are detected, so as to realize being exported on A, B, C three-phase the three-phase electricity of stabilization, as three
Phase voltage source form, uses for load.
When battery electric quantity is sufficient（For example, the electricity of battery 430 is more than or equal to first threshold）When, diesel-driven generator machine
420 work, diesel-driven generator machine 420 gives the load supplying of A circuitry phases, while being input into by the A phases of three-phase energy storage inverter 410
Hold and provide power supply and phase to three-phase energy storage inverter 410.The A phases of three-phase energy storage inverter 410 are defeated by diesel-driven generator machine 420
The energy for going out is rectified to dc bus, and battery is in floating charge state or non-charged state.It is female comprising direct current wherein on dc bus
Line Support Capacitor, dc bus Support Capacitor can storage energy, the B phases and C phases of three-phase energy storage inverter are supported from dc bus
Energy is obtained on electric capacity, realizes that DC/AC is converted, and detected than A phases respectively with the output of voltage source form, B phases and C phases phase
Phase falls behind 120 ° and 240 °, so as to realize being exported on A, B, C three-phase the three-phase electricity of stabilization, as three-phase voltage source form, supplies
Load is used.
When battery electric quantity is sufficient, diesel-driven generator machine 420 works, and wherein diesel-driven generator machine 420 is to the negative of A circuitry phases
Power supply is carried, while providing voltage source and phase to three-phase energy storage inverter 410 by the A phases input of three-phase energy storage inverter 410
Position.The A phases of three-phase energy storage inverter 410 export powering load in current source form, while the B of three-phase energy storage inverter 410
Mutually exported in voltage source form with C phases, B phases and C phases phase fall behind 120 ° and 240 ° than the phase that A phases are detected respectively, so that
Realize being exported on A, B, C three-phase the three-phase electricity of stabilization, as three-phase voltage source form, used for load.
When battery electric quantity is not enough, three-phase inverter switchs to single-phase work, only gives wherein single-phase important load（High priority
Load）Power supply, disconnects the power supply of other two-phases.When important load is only single-phase in system, can be by the phase important load
Configuration is powered on certain is single-phase, and realizes that important load extends power-on time by the method.Without setting special in addition
Distribution and protection equipment, reduce system cost.
When three-phase energy storage inverter and not enough single-phase diesel-driven generator fan-out capability, can cut off negative by following order
Carry：In other words single-phase load A, single-phase load B, single-phase load C, threephase load, high priority load, cut off power stage first
Other load, finally cuts off limit priority load, is supplied with the energy for realizing priority level load high during system charge deficiency
Should.
Fig. 5 is the schematic circuit of two-way inverter circuit 510 a kind of according to an embodiment of the invention.Two-way inversion electricity
Road 510 is the three-phase inverter 110 of Fig. 1, and detailed description is suitably omitted herein.
Two-way inverter circuit 510 includes controller 514, the first power conversion modules 511, the second power conversion modules 512
With the 3rd power conversion modules 513.
First power conversion modules 511, the second power conversion modules 512 and the 3rd power conversion modules 513 are used for will be straight
Stream electricity is converted into unsteady flow electricity or converts alternating current to direct current.
Controller 514, for the power supply capacity and loading condition of two-way inversion system meet it is pre-conditioned in the case of
Control at least one of the first power conversion modules, the second power conversion modules and the 3rd power conversion modules power conversion mould
The mode of operation of block is different from the mode of operation of other power conversion modules, and mode of operation includes：It is stopped, direct current is changed
Direct current is converted into alternating current and alternating current.
Embodiments in accordance with the present invention, can be according to the power supply capacity of two-way inversion system and loading condition control three-phase work(
Rate conversion module is operated under different mode of operations so that three phase power conversion module can be relatively independently three-phase alternating current
The load of each single-phase circuit in circuit provides electric energy, so that two-way inversion system can be under three-phase imbalance load
Normal work.
Alternatively, as another embodiment, three-phase inverter also includes：First isolating transformer, the second isolating transformer
With the 3rd isolating transformer, the first power conversion modules, the second power conversion modules and the 3rd power are connected in series in respectively and are become
On the corresponding single-phase circuit of mold changing block.First isolating transformer, the second isolating transformer and the 3rd isolating transformer and Fig. 2 every
It is similar with Tc from transformer Ta, Tb, will not be repeated here.
Those of ordinary skill in the art are it is to be appreciated that the list of each example described with reference to the embodiments described herein
Unit and algorithm steps, can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
Performed with hardware or software mode, depending on the application-specific and design constraint of technical scheme.Professional and technical personnel
Described function, but this realization can be realized it is not considered that exceeding using distinct methods to each specific application
The scope of the present invention.
It is apparent to those skilled in the art that, for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, may be referred to the corresponding process in preceding method embodiment, will not be repeated here.
In several embodiments provided herein, it should be understood that disclosed system, apparatus and method, can be with
Realize by another way.For example, device embodiment described above is only schematical, for example, the unit
Divide, only a kind of division of logic function there can be other dividing mode when actually realizing, for example multiple units or component
Can combine or be desirably integrated into another system, or some features can be ignored, or do not perform.It is another, it is shown or
The coupling each other for discussing or direct-coupling or communication connection can be the indirect couplings of device or unit by some interfaces
Close or communicate to connect, can be electrical, mechanical or other forms.
The unit that is illustrated as separating component can be or may not be it is physically separate, it is aobvious as unit
The part for showing can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be according to the actual needs selected to realize the mesh of this embodiment scheme
's.
In addition, during each functional unit in each embodiment of the invention can be integrated in a processing unit, it is also possible to
It is that unit is individually physically present, it is also possible to which two or more units are integrated in a unit.
If the function is to realize in the form of SFU software functional unit and as independent production marketing or when using, can be with
Storage is in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words
The part contributed to prior art or the part of the technical scheme can be embodied in the form of software product, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used to so that a computer equipment（Can be individual
People's computer, server, or network equipment etc.）Perform all or part of step of each embodiment methods described of the invention.
And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage（ROM, Read-Only Memory）, arbitrary access deposits
Reservoir（RAM, Random Access Memory）, magnetic disc or CD etc. are various can be with the medium of store program codes.
The above, specific embodiment only of the invention, but protection scope of the present invention is not limited thereto, and it is any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.
Claims (12)
1. a kind of two-way inversion system, it is characterised in that including：
Three-phase inverter, for direct current to be converted into unsteady flow electricity or direct current, the three-phase inversion is converted alternating current to
Device includes controller, the first power conversion modules, the second power conversion modules and the 3rd power conversion modules, and the controller is used
In the power supply capacity and loading condition of the two-way inversion system meet it is pre-conditioned in the case of control first power
At least one of conversion module, second power conversion modules and the 3rd power conversion modules power conversion modules
Mode of operation is different from the mode of operation of other power conversion modules, and the mode of operation includes：It is stopped, direct current is changed
Direct current is converted into alternating current and alternating current；
Energy-storage units, the direct current component with the three-phase inverter is connected, the direct current for storing the three-phase inverter
With provide direct current for the three-phase inverter；
At least one single-phase of generating electricity equipment, with least one of the three-phase circuit of two-way inversion system single-phase circuit
Connection, for providing electric energy for the two-way inversion system, the three-phase circuit respectively with the first power conversion mould
Block, second power conversion modules are corresponding with the 3rd power conversion modules, for providing electric energy at least one load.
2. two-way inversion system according to claim 1, it is characterised in that the three-phase inverter also includes：First every
From transformer, the second isolating transformer and the 3rd isolating transformer, first power conversion modules, institute are connected in series in respectively
State on the second power conversion modules and the corresponding single-phase circuit of the 3rd power conversion modules.
3. two-way inversion system according to claim 1 and 2, it is characterised in that also include：
At least one switch, be connected at least one load and the three-phase circuit of the three-phase inverter it
Between, the controller is additionally operable to turning on and off for control at least one switch, to connect or cut off described at least one
Load.
4. two-way inversion system according to claim 3, it is characterised in that at least one switch includes at least one
Single-phase switch, is connected between the single-phase circuit of at least one load and the three-phase inverter, and the controller is also used
In turning on and off at least one single-phase switch is controlled, to connect or cut off at least one single-phase load.
5. two-way inversion system according to claim 3, it is characterised in that at least one switch includes：At least one
Individual threephase switch, is connected between the three-phase circuit of threephase load and the three-phase inverter, and the controller is additionally operable to
Turning on and off at least one threephase switch is controlled, to connect or cut off the threephase load.
6. two-way inversion system according to claim 3, it is characterised in that also include：Extension switch board, for receiving
The control signal of controller is stated, and controls turning on and off at least one switch.
7. two-way inversion system according to claim 1, it is characterised in that at least one single-phase of generating electricity equipment includes
First single-phase of generating electricity equipment, the first single-phase of generating electricity equipment connects the corresponding single-phase circuit of the first power conversion modules.
8. two-way inversion system according to claim 7, it is characterised in that at least one load includes single-phase bearing
Load, threephase load and the load of high priority, the load of high priority list corresponding with first power conversion modules
Circuitry phase is connected.
9. two-way inversion system according to claim 8, it is characterised in that the controller is used in two-way inversion system
When power supply capacity is not enough, load is cut off according to the sequencing of the load of single-phase load, threephase load and high priority.
10. two-way inversion system according to claim 7, it is characterised in that the controller is also single-phase described first
When generating equipment does not work, second power conversion modules and the 3rd power conversion modules are controlled to be stopped.
11. two-way inversion systems according to claim 7, it is characterised in that the controller is also single-phase described first
When generating equipment works and when the electricity of the energy-storage units is less than first threshold, first power conversion modules are controlled to hand over
Stream electricity is converted into direct current, and controls second power conversion modules and the 3rd power conversion modules to be converted into direct current
Alternating current.
12. according to the described two-way inversion system of any one of claim 7 to 11, it is characterised in that the controller is also
When the electricity of single-phase of generating electricity equipment work and the energy-storage units is more than or equal to first threshold, first work(is controlled
Rate conversion module, second power conversion modules and the 3rd power conversion modules are by converting direct-current power into alternating-current power.
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| CN104078971A (en) * | 2014-07-10 | 2014-10-01 | 广东工业大学 | Microgrid three-phase-balanced and electricity-optimized sub-grid structure and control method |
| KR101644522B1 (en) * | 2015-11-20 | 2016-08-01 | 케이씨코트렐 주식회사 | Power supply system of ac microgrid three phase |
| CN108178040B (en) * | 2017-12-11 | 2019-12-10 | 日立楼宇技术（广州）有限公司 | power failure emergency method and device for multiple elevators, computer equipment and storage medium |
| CN107834534B (en) * | 2017-12-19 | 2023-12-22 | 青岛孚迪尔电气自动化有限公司 | Power supply management system for intelligent inspection robot and management method thereof |
| CN110266029A (en) * | 2019-06-03 | 2019-09-20 | 杭州模储科技有限公司 | A kind of modular multilevel energy-storage system |
| CN114257085A (en) * | 2021-11-30 | 2022-03-29 | 阳光电源股份有限公司 | Power conversion circuit, control method thereof and power supply system |
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