CN107846037A - Power transfer module, electricity generation system and its control method - Google Patents
Power transfer module, electricity generation system and its control method Download PDFInfo
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- CN107846037A CN107846037A CN201610836506.5A CN201610836506A CN107846037A CN 107846037 A CN107846037 A CN 107846037A CN 201610836506 A CN201610836506 A CN 201610836506A CN 107846037 A CN107846037 A CN 107846037A
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- 230000005611 electricity Effects 0.000 title claims abstract description 113
- 238000012546 transfer Methods 0.000 title claims abstract description 50
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- 238000010586 diagram Methods 0.000 description 10
- 238000010248 power generation Methods 0.000 description 10
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- 229910052742 iron Inorganic materials 0.000 description 5
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention discloses a kind of power transfer module, electricity generation system and its control method, wherein, power transfer module includes generating end change-over circuit, power network end change-over circuit and control drive circuit.Generating end change-over circuit exports one first electric current to receive an input voltage according to the input voltage.Power network end change-over circuit is electrically coupled to the generating end change-over circuit in a node, to receive first electric current and one power network is powered according to first electric current.Controlling drive circuit, to control the voltage quasi position of the node by the power network end change-over circuit, the wherein voltage class of the node is middle pressure grade to export a drive signal to the power network end change-over circuit.
Description
Technical field
The present invention is on a kind of electricity generation system, and especially with regard to a kind of electricity generation system using the renewable sources of energy.
Background technology
As global warming phenomenon is aggravated, passed with the renewable sources of energy such as low-carbon electric power such as wind-force, solar power generation source substitution
The thermal power generation unit for high carbon emission of uniting, it has also become various countries promote the important goal of energy transition.
However, electric power caused by existing Wind turbine and solar electrical energy generation module before feed-in power network, it is necessary to corresponding
Power-switching circuit handled.With the raising of TRT capacity, the body of circuit element needed for power-switching circuit
Product also improves therewith with cost.
Therefore, the framework of existing renewable energy generating system how is improved, to reduce installation cost and improve turning for power supply
Efficiency is changed, actually the important research theme in current this area.
The content of the invention
A kind of aspect of present invention is a kind of power transfer module.Power transfer module is changed comprising the first generating end
Circuit, power network end change-over circuit and control drive circuit.First generating end change-over circuit is receiving an input voltage, and root
One first electric current is exported according to the input voltage.Power network end change-over circuit is electrically coupled to the first generating end change-over circuit in a section
Point, to receive first electric current and be powered according to first electric current to a power network.Drive circuit is controlled to export a driving
Signal is to the power network end change-over circuit, to control the voltage quasi position of the node, the wherein node by the power network end change-over circuit
Voltage class be middle pressure grade.
In the section Example of present invention, the first generating end change-over circuit to control a solar energy module grasp
Make in a maximum power point, to receive the input voltage from the solar energy module, wherein the input voltage is DC voltage.
In the section Example of present invention, it is single that the first generating end change-over circuit includes the conversion of one first DC
Member, to control solar energy module operation to export a DC current in the maximum power point, and according to the input voltage；And
One second DC converting unit, it is electrically connected between the first DC converting unit and the node, to basis
The DC current exports first electric current to the node.
In the section Example of present invention, the second DC converting unit includes an isolated DC direct current
Converter, to provide being galvanically isolated between the solar energy module and the power network end change-over circuit.
In the section Example of present invention, the first generating end change-over circuit to control a wind-driven generator grasp
Make in a maximum power point, to receive the input voltage from the wind-driven generator, wherein the input voltage is alternating voltage.
In the section Example of present invention, the first generating end change-over circuit includes：The conversion of one AC DC is single
Member, to control wind-driven generator operation to export a DC current in the maximum power point, and according to the input voltage；And
One direct current DC conversion unit, it is electrically connected between the AC DC converting unit and the node, to according to the direct current
Stream exports first electric current to the node.
In the section Example of present invention, the power network end change-over circuit includes a direct current AC conversion unit, should
DC-AC converting unit is to export the alternating electromotive force with the power network with frequency with phase, to be powered to the power network.
In the section Example of present invention, power transfer module further includes one second generating end change-over circuit, uses
To receive one second input voltage, and one second electric current is exported according to second input voltage；The wherein power network end change-over circuit
The second generating end change-over circuit is electrically coupled in the node, to receive second electric current and according to first electric current with being somebody's turn to do
Second electric current is powered to the power network.
In the section Example of present invention, power transfer module further includes an energy storage device；An and energy storage end
Change-over circuit, it is electrically coupled between the node and the energy storage device, to provide the node or receive an energy storage from the node
Electric current is with to the energy storage device discharge and recharge；Wherein the control drive circuit is more exporting one second drive signal to the energy storage end
Change-over circuit, to control the energy storage electric current by the energy storage end change-over circuit, adjust exported from the node to the power network end according to this
The size of current of change-over circuit.
Another aspect of present invention is a kind of electricity generation system.Electricity generation system includes electricity generation module, power transfer module
And power network end switch circuit.Power transfer module includes the first generating end change-over circuit, power network end change-over circuit and control
Drive circuit.First generating end change-over circuit is electrically coupled to the electricity generation module, to receive an input electricity from the electricity generation module
Pressure, and one first electric current is exported according to the input voltage.Power network end change-over circuit is electrically coupled to the first generating end conversion electricity
Lu Yuyi nodes, to receive first electric current and be powered according to first electric current to a power network.Drive circuit is controlled to defeated
Go out a drive signal to the power network end change-over circuit, to control the voltage quasi position of the node by the power network end change-over circuit.Electricity
Net end switch circuit is electrically coupled between the power network end change-over circuit and the power network, to when the power network exception optionally
Shut-off, use and isolate the power network end change-over circuit and the power network.
In the section Example of present invention, the power network end change-over circuit is more local negative to be electrically coupled to one
Carry, with to the local load supplying.
Another aspect of present invention is a kind of control method of electricity generation system.Control method includes：By one first
Generating end change-over circuit receives an input voltage, and produces one first electric current according to the input voltage；Drive circuit is controlled by one,
Export a drive signal to a power network end change-over circuit, wherein the power network end change-over circuit and the first generating end change-over circuit coupling
It is connected to a node；By the power network end change-over circuit, the voltage quasi position of the node is controlled according to the drive signal；And by the electricity
First electric current is converted to exchange electricity output to a power network by net end change-over circuit.
In the section Example of present invention, the step of first electric current is produced by the first generating end change-over circuit
Suddenly include：Solar energy module operation is controlled in a maximum power point, to receive the input voltage from the solar energy module, wherein
The input voltage is DC voltage.
In the section Example of present invention, the step of first electric current is produced by the first generating end change-over circuit
Suddenly further include：By one first DC converting unit of the first generating end change-over circuit, the solar energy module is controlled to operate
In the maximum power point；One DC current is exported according to the input voltage by the first DC converting unit；And by this
One second DC converting unit of the first generating end change-over circuit, first electric current is exported to the section according to the DC current
Point.
In the section Example of present invention, the step of first electric current is produced by the first generating end change-over circuit
Suddenly include：Wind-driven generator operation is controlled in a maximum power point, to receive the input voltage from the wind-driven generator, wherein
The input voltage is alternating voltage.
In the section Example of present invention, the step of first electric current is produced by the first generating end change-over circuit
Suddenly further include：By an AC DC converting unit of the first generating end change-over circuit, wind-driven generator operation is controlled at this
Maximum power point；One DC current is exported according to the input voltage by the AC DC converting unit；And first generated electricity by this
A direct current DC conversion unit of change-over circuit is held, first electric current is exported to the node according to the DC current.
In the section Example of present invention, first electric current is converted into alternating current by the power network end change-over circuit
Output to the step of power network, includes：It is same with the power network by a direct current AC conversion unit of the power network end change-over circuit, output
Frequently with the alternating current of phase, to be powered to the power network.
In the section Example of present invention, control method further includes：Received by one second generating end change-over circuit
One second input voltage, and one second electric current is exported according to second input voltage；And by the power network end change-over circuit, certainly should
Node, which receives first electric current with second electric current and is converted to by first electric current with second electric current, exchanges electricity output to should
Power network.
In the section Example of present invention, control method further includes：When the power network exception, selectively turn off
The power network end switch circuit being electrically coupled between the power network end change-over circuit and the power network, use and isolate power network end conversion
Circuit and the power network；And first electric current is converted into alternating current to supply a local load by the power network end change-over circuit
Electricity.
In the section Example of present invention, control method further includes：The section is provided by an energy storage end change-over circuit
Point receives an energy storage electric current from the node；And one second drive signal to the energy storage end is exported by the control drive circuit and turned
Circuit is changed, to control the energy storage electric current by the energy storage end change-over circuit, adjusts exported from the node to the power network end turn according to this
Change the size of current of circuit.
In summary, present invention carries out the energy biography in conversion module by the direct current by middle pressure (MV) grade
Defeated reduce transmits online line loss, the overall conversion efficiency of lifting system.In addition, in present invention, driven by control
Dynamic circuit output drive signal, pass through voltage quasi position and the output current of feed-in power network of power network end change-over circuit control node
Frequency and phase, therefore generating end change-over circuit can use high frequency circuit design.Consequently, it is possible to the end change-over circuit that generates electricity into
The problems such as this reduction, volume-diminished, copper loss, iron loss are reduced so that conversion module, which is realized, to be minimized and more save.
Brief description of the drawings
Fig. 1 is the schematic diagram of the electricity generation system according to depicted in section Example of the present invention.
Fig. 2 is the schematic diagram of the electricity generation system according to depicted in section Example of the present invention.
Fig. 3 is the schematic diagram of the electricity generation system according to depicted in section Example of the present invention.
Fig. 4 is the schematic diagram of the electricity generation system according to depicted in section Example of the present invention.
Fig. 5 is the schematic diagram of the electricity generation system according to depicted in other parts embodiment of the present invention.
Fig. 6 is the flow chart of the control method of the electricity generation system according to depicted in present invention section Example.
Wherein, reference
100 power transfer modules
120th, 140 generating end change-over circuit
The DC converting unit of 122a, 142b, 124,144
122c, 142d AC DC converting unit
130 energy storage end change-over circuits
150 energy storage devices
160 power network end change-over circuits
180 control drive circuits
220th, 240 electricity generation module
300 power networks
400 power network end switch circuits
600 control methods
900 local loads
N1 nodes
PV1, PV2 solar energy module
WT1, WT2 wind-driven generator
Vin1, Vin2 input voltage
Vbus voltage quasi positions
I1, I2, I3, Ia, Ib, Ic, Id, Io, Iload electric current
DS, DS1, DS2 drive signal
S610~S680 steps
Embodiment
Hereafter coordinate institute's accompanying drawings to elaborate for embodiment, to more fully understand the aspect of the present invention, but provided
Embodiment and be not used to the scope that is covered of the limitation present invention, and the description of structure operation be not used to limit its perform it is suitable
Sequence, any structure reconfigured by element is produced to have equal and other effects device, is all the scope that the present invention is covered.
In addition, according to the standard and practice of industry, schema is mapped only for the purpose of aid illustration not according to full size, actual
The size of upper various features can be increased or decreased arbitrarily in order to illustrate.Similar elements will be with identical symbol in the description below
Indicate to illustrate in order to understand.
In word (terms) used in full piece specification and claim, in addition to having and especially indicating, generally have
Each word using in the content invented in this area, at this with the usual meaning in special content.It is some describing this
The word of invention by it is lower or this specification other places discuss, to provide those skilled in the art in description for the present invention
Upper extra guiding.
In addition, word "comprising", " comprising ", " having ", " containing " etc. used in herein, are open
Term, that is, mean " including but not limited to ".In addition, used herein " and/or ", comprising one or more in associated listed items
Any one and its all combination of individual project.
In this article, when an element is referred to as " connecting " or when " coupling ", can refer to " electric connection " or " electric property coupling ".
" connection " or " coupling " also can be used to represent to be collocated with each other operation or interactive between two or multiple element.Although in addition, make herein
With " first ", " second " ... wait term to describe different elements, the term be only distinguish with constructed term describe member
Part or operation.Indicated unless context understands, otherwise order or cis-position are not especially censured or implied to the term, is also not used to limit
The fixed present invention.
It refer to Fig. 1.Fig. 1 is the schematic diagram of the electricity generation system according to depicted in section Example of the present invention.Such as Fig. 1 institutes
Show, in some embodiments, electricity generation system includes power transfer module 100, electricity generation module 220,240 and power network 300.Power supply
Modular converter 100 is electrically coupled between electricity generation module 220,240 and power network 300, electricity generation module 220,240 to be exported
Electric energy be converted to suitable form feed-in power network 300.Specifically, the input of power transfer module 100 is electrically coupled to
Electricity generation module 220,240, to receive input voltage vin 1, Vin2.The output end of power transfer module 100 is electrically coupled to power network
300, to the power supply of power network 300 and output current Io.
In some embodiments, power transfer module 100 includes generating end change-over circuit 120,140, power network end conversion electricity
Road 160 and control drive circuit 180.In structure, generating end change-over circuit 120 to be electrically coupled to electricity generation module 220,
To receive input voltage vin 1, and according to the output current I1 of input voltage vin 1.Similarly, generating end change-over circuit 140 to
Electricity generation module 240 is electrically coupled to, to receive input voltage vin 2, and according to the output current I2 of input voltage vin 2.
Power network end change-over circuit 160, generating end change-over circuit 120,140 is electrically coupled in node N1, and to receive
Electric current I1, I2 simultaneously power according to electric current I1, I2 output current Io received to power network 300.Specifically, in section Example
In, power network end change-over circuit 160 includes DC-AC converting unit, DC current I1, the I2 that will be received, is converted to and electricity
Net 300 exports with frequency with the alternating current Io of phase, to be powered to power network 300.Specifically, in some embodiments, power network end
Change-over circuit 160 can pass through one or more groups of igbt (Insulated Gate Bipolar being one another in series
Transistor, IGBT) unit is realized, or the different circuits such as three level NPC inverters (3-Level NPC Inverter)
Framework is realized, but the present invention is not limited thereto.
Although it is worth noting that, illustrating two groups of generating end change-over circuits 120 in illustrated embodiment in Fig. 1, it is only
It is used for example, and is not used to the limitation present invention.For example, in some embodiments, electricity generation system also can only include one group
Electricity generation module 220 and corresponding generating end change-over circuit 120 so that power network end change-over circuit 160 receives electric current I1 and basis
Electric current I1 powers to power network 300.In other parts embodiment, electricity generation system can also include three groups or more of electricity generation module
220th, 240 and corresponding number of generating end change-over circuit 120,140 so that power network end change-over circuit 160 receives each group and generated electricity
The electric current for holding change-over circuit 120,140 to export, and power network 300 is powered according to this.
In some embodiments, control drive circuit 180 is electrically coupled to power network end change-over circuit 160, and to export
Drive signal DS is to power network end change-over circuit 160, to pass through the control node N1 of power network end change-over circuit 160 voltage quasi position
Vbus.Specifically, in some embodiments, control drive circuit 180 passes through the control node N1's of power network end change-over circuit 160
Voltage quasi position Vbus voltage class presses (MV) grade (such as to be middle：1kV~35kV).
For example, in some embodiments, power network end change-over circuit 160 can be included by multiple igbts
The inverter circuit of (Insulated Gate Bipolar Transistor, IGBT) implementation, and by controlling drive circuit
The keying of the drive signal DS control thyristors of 180 outputs, realizes energy between node N1 and power network 300 according to this
Two-way circulate.Thereby, opening for thyristor in power network end change-over circuit 160 is suitably switched by drive signal DS
Close, can control node N1 voltage quasi position Vbus, and maintain the output of power network end change-over circuit 160 with power network 300 with same phase frequently
Alternating electromotive force (such as：Electric current Io) power network 300 is powered.
Pass through the mutual operation of above circuit, the self power generation end change-over circuit 120,140 of power transfer module 100 transmission electric power
During to power network end change-over circuit 160, energy transmission can be carried out by the direct current of middle pressure grade.Consequently, it is possible to biography can be reduced
Defeated online line loss, the overall conversion efficiency of lifting system.
Further, since control drive circuit 180 output drive signal DS so that power network end change-over circuit 160 is to node N1
The voltage quasi position Vbus and output current Io of feed-in power network 300 frequency and phase be controlled, therefore generating end conversion electricity
Road 120,140 can use high frequency circuit design so that the cost of generating end change-over circuit 120,140 further reduces.In addition,
High frequency circuit design can also avoid the problems such as bulky, high copper loss, high iron loss caused by Industrial Frequency Transformer, and then make power supply
Modular converter 100 is minimized and more saved.
It refer to Fig. 2.Fig. 2 is the schematic diagram of the electricity generation system according to depicted in section Example of the present invention.In Fig. 2,
The similar components relevant with Fig. 1 embodiment represent in order to understand with the same references, and the specific original of similar components
Reason describes in detail in previous paragraph, if not there is Collaboration relation and necessity person of introduction with Fig. 2 interelement, in this not
Repeat again.
As shown in Fig. 2 in some embodiments, electricity generation module 220,240 includes solar energy module PV1, PV2 respectively, its
Input voltage vin 1, the DC voltage that Vin2 is photovoltaic output.Generating end change-over circuit 120,140 is respectively controlling
Solar energy module PV1, PV2 are operated at maximum power point (Maximum Power Point), are connect with self power generation module 220,240
Receive input voltage vin 1, Vin2.Specifically, when solar energy module PV1, PV2 are operated in different operating points, exported
Voltage, current characteristics all differ.Therefore, generating end change-over circuit 120,140 controls solar energy module PV1, PV2 operation most
At high-power, electricity generation module 220,240 can be made to provide generating efficiency maximum in real time.In addition, as Figure 2 illustrates, in this reality
Apply in example, power transfer module 100 is series type (String) DC-AC converter, therefore each group electricity generation module 220,240 can
Operating point is controlled by each self-corresponding generating end change-over circuit 120,140.Even if consequently, it is possible to each group solar energy module PV1,
PV2 is shielded from the influence of phenomena such as effect and has different maximum power point, and each group generating end change-over circuit 120,140 still may be used
It is controlled respectively by respective controller, each group of electricity generation module 220,240 is all provided the generating efficiency of real-time maximum,
To realize maximum power tracing (Maximum Power Point Tracking, MPPT).
Specifically, in the embodiment depicted in Fig. 2, generating end change-over circuit 120 includes DC converting unit
122a、124.In structure, DC converting unit 122a electric property coupling solar energy module PV1, and to by corresponding
The control signal control solar energy module PV1 that controller is exported is operated in maximum power point, and defeated according to input voltage vin 1
Go out DC current Ia.In other words, DC converting unit 122a can be used as DC current source, and solar energy module PV1 is exported
Electric energy be transferred to DC converting unit 124.Specifically, in some embodiments, DC converting unit 122a
It can be realized by the various change-over circuits of boosting type converter or buck converter etc..Generating end change-over circuit 120 passes through phase
The keying of switch element in the controller output control signal control DC converting unit 122a answered, to cause solar energy mould
Block PV1 is operated in corresponding maximum power point.
Between DC converting unit 124 electric property coupling DC converting unit 122a and node N1, and to root
According to DC current Ia output currents I1 to node N1.As shown in Fig. 2 in some embodiments, DC converting unit 124 is wrapped
Direct current transducer containing isolated DC, to provide the electric current between electricity generation module 220 and power network end change-over circuit 160 every
From.Consequently, it is possible to the respective normal behaviour of 124 liang of lateral circuits of DC converting unit with different voltage class can be ensured
Make.For example, in some embodiments, the operating voltage of generating end change-over circuit 120 can be 650V or 800V etc..Relatively
, node N1 voltage quasi position Vbus can be middle pressure (MV) grade between 1kV~35kV.For example, in section Example
In, DC converting unit 124 realizes the power supply between front stage comprising commutator transformer (DC Transformer, DCX)
Isolation and transformation.Specifically, commutator transformer can be realized by LLC resonant mode power supply changeover devices framework, but the present invention is not
As limit.
Similarly, in some embodiments, generating end change-over circuit 140 includes DC converting unit 142b, 144.
DC converting unit 142b electric property coupling solar energy module PV2, and to control solar energy module PV2 operations in maximum work
Rate point, and DC current Ib is exported according to input voltage vin 2.The electric property coupling DC of DC converting unit 144 is changed
Between unit 142b and node N1, and to according to DC current Ib output currents I2 to node N1.As shown in Fig. 2 in part
In embodiment, DC converting unit 144 includes isolated DC direct current transducer, to provide solar energy module PV2 with
And being galvanically isolated between power network end change-over circuit 160.The physical circuit of generating end change-over circuit 140 turns with operation and generating end
It is similar to change circuit 120, and has been described in detail in previous paragraph, therefore is repeated no more in this.
It is worth noting that, DC converting unit 122a in the embodiment depicted in figure 2,124 and DC
Converting unit 142b, 144 can use various suitable power electronic elements (such as：Igbt etc.), and with various
Different types of non-isolation type exchangeable type power supply circuit and isolated form exchangeable type power supply circuit are realized.
It is worth noting that, the electricity generation system in present invention not only can be applicable to too with power transfer module 100
In positive energy electricity generation system, also it can be applicable in wind generator system.It refer to Fig. 3.Fig. 3 is according to section Example of the present invention
The schematic diagram of depicted electricity generation system.In Fig. 3, the similar components relevant with Fig. 1, Fig. 2 embodiment are referred to identical
Label is represented in order to understand, and the concrete principle of similar components describes in detail in previous paragraph, if not the element with Fig. 3
Between there is Collaboration relation and necessity person of introduction, repeated no more in this.
As shown in figure 3, in some embodiments, electricity generation module 220,240 includes wind-driven generator WT1, WT2 respectively, its
Input voltage vin 1, the alternating voltage that Vin2 is wind-driven generator WT1, WT2 output.For example, wind-driven generator WT1, WT2
Three-phase ac power can be exported respectively to generating end change-over circuit 120,140.Generating end change-over circuit 120,140 is respectively controlling
Wind-driven generator WT1, WT2 processed operation are at maximum power point (Maximum Power Point), with self power generation module 220,240
Receive input voltage vin 1, Vin2.
It is similar to the solar power system depicted in Fig. 2, when wind-driven generator WT1, WT2 are operated in different operating points
When, the voltage, the current characteristics that are exported all differ.Therefore, generating end change-over circuit 120,140 control wind-driven generator WT1,
WT2 is operated in maximum power point, and electricity generation module 220,240 can be made to provide generating efficiency maximum in real time.In addition, such as Fig. 3 institutes
Illustrate, in the present embodiment, power transfer module 100 is series type (String) converter, therefore each group electricity generation module 220,
240 can control operating point by each self-corresponding generating end change-over circuit 120,140.Even if consequently, it is possible to each group wind-driven generator
WT1, WT2 are in different wind friction velocities and have different maximum power point, and each group generating end change-over circuit 120,140 is still
It can be respectively controlled, each group of electricity generation module 220,240 is all provided the generating efficiency of real-time maximum, to realize peak power
Follow the trail of (Maximum Power Point Tracking, MPPT).
With Fig. 2 depicted in embodiment compare, in the embodiment depicted in Fig. 3, generating end change-over circuit 120 include it is multiple
AC DC converting unit 122c and DC converting unit 124.In structure, AC DC converting unit 122c difference
Each group winding in electric property coupling electricity generation module 220, and to control wind-driven generator WT1 to operate in maximum power point, and root
DC current Ic is exported according to input voltage vin 1.In other words, AC DC converting unit 122c can be used as DC current source, by wind
The electric energy of power generator WT1 outputs is transferred to DC converting unit 124.
Between DC converting unit 124 electric property coupling AC DC converting unit 122c and node N1, and to root
According to DC current Ic output currents I1 to node N1.It is similar to embodiment illustrated in fig. 2, in the present embodiment, DC conversion
Unit 124 can also include isolated DC direct current transducer, to provide electricity generation module 220 and power network end change-over circuit 160
Between be galvanically isolated, to ensure to have 124 liang of lateral circuits of DC converting unit of different voltage class respective normal
Operation.
Similarly, in some embodiments, generating end change-over circuit 140 include multiple AC DC converting unit 142d with
And DC converting unit 144.Each group in AC DC converting unit 142d difference electric property coupling electricity generation module 240 around
Group, and to control wind-driven generator WT2 operations to export DC current Id in maximum power point, and according to input voltage vin 2.
Between DC converting unit 144 electric property coupling AC DC converting unit 142d and node N1, and to according to direct current
Flow Id output currents I2 to node N1.The physical circuit of generating end change-over circuit 140 and operation and the phase of generating end change-over circuit 120
Seemingly, and describe in detail in previous paragraph, therefore repeated no more in this.
In other words, as shown in Figure 2 and Figure 3, in different embodiments of the invention, power transfer module 100 can include corresponding
Generating end change-over circuit 120,140 to coordinate different electricity generation modules 220,240, such as the solar energy mould of solar power system
Wind-driven generator WT1, WT2 of block PV1, PV2 or wind generator system etc..Consequently, it is possible to power transfer module 100
Apply in different renewable energy generating systems, to reduce the volume of power transfer module 100 and cost.In addition, pass through electricity
The high frequency circuit of source modular converter 100 and corresponding control, it can also realize the maximum power tracing of Generation Side, reduce copper and iron damage,
Thereby improve system overall generating efficiency and conversion efficiency.
In addition, in some embodiments, power transfer module 100 also can be applicable to solar energy-wind energy hybrid power generation system
In.It refer to Fig. 4.Fig. 4 is the schematic diagram of the electricity generation system according to depicted in section Example of the present invention.In Fig. 4, with Fig. 1
The similar components that~Fig. 3 embodiment is relevant represent in order to understand with the same references, and the specific original of similar components
Reason describes in detail in previous paragraph, if not there is Collaboration relation and necessity person of introduction with Fig. 4 interelement, in this not
Repeat again.
As shown in figure 4, generating end change-over circuit 120,140 can be respectively from solar energy module PV1 in power transfer module 100
Input voltage vin 1, Vin2 are received with wind-driven generator WT2, and passes through DC converting unit 122a and AC DC respectively
Converting unit 142d exports DC current Ia, Id to DC converting unit 124,144.Thereby, power network end change-over circuit 160
Electric energy can be received from the generating end change-over circuit 120,140 for being connected to different generating set of renewable energy resource, and converted electrical energy into
Exported for appropriate current forms to power network 300.Consequently, it is possible to power transfer module 100 just can be applicable to solar energy-wind energy
Operated in hybrid power system.Although in addition, only illustrate one group of solar energy module PV1 and one group in Fig. 4 institutes embodiment
Wind-driven generator WT2, but its it is merely illustrative be used, and be not used to limitation the present invention.As described in previous paragraph, this area tool is usual
Skill can set the group number and type of generating end change-over circuit 120,140 according to the actual requirements, to be sent out in electricity generation system of arranging in pairs or groups
The quantity and type of electric module 220,240 so that power network end change-over circuit 160 receives each group generating end change-over circuit 120,140
Electric current I1, I2 of output, and power network 300 is powered according to this.
In addition, similarly, generating end change-over circuit 120,140 also can be different from other respectively in power transfer module 100
Power source receive input voltage, and electric energy is received by the end change-over circuit 120,140 that generates electricity accordingly, and converted electrical energy into
Exported for appropriate current forms to power network 300.In other words, power transfer module 100 also can be applicable to various mixed power generation systems
Operated in system.For example, power transfer module 100 also can be from hydroelectric generation, tidal power generation, ocean current power generation, firepower hair
The generating set of electricity, nuclear energy power generation etc. the different renewable sources of energy or traditional energy receives electric power, and passes through generating end change-over circuit
120th, 140 convert electrical energy into appropriate current source form, and by circuit in parallel by electric power caused by each unit provide to
Power network end change-over circuit 160, and voltage quasi position Vbus and feed-in power network 300 by power network end change-over circuit 160 to node N1
Output current Io frequency and phase is controlled, to be powered to power network 300.
Similar to the change-over circuit in embodiment described in Fig. 2, in Fig. 3, embodiment illustrated in fig. 4, AC DC conversion is single
First 122c, 142d can also use various suitable power electronic elements (such as：Igbt etc.), and with various differences
The non-isolation type exchangeable type power supply circuit of type is realized.
It refer to Fig. 5.Fig. 5 is the schematic diagram of the electricity generation system according to depicted in other parts embodiment of the present invention.In Fig. 5
In, the similar components relevant with Fig. 1 embodiment represent in order to understand with the same references, and similar components is specific
Principle describes in detail in previous paragraph, necessity person of introduction if not having Collaboration relation with Fig. 5 interelement, in this
Repeat no more.
Compared with embodiment illustrated in fig. 1, as shown in figure 5, in some embodiments, electricity generation system further includes power network end switch
Circuit 400 and local load 900.Power network end switch circuit 400 is arranged between power transfer module 100 and power network 300.
Specifically, as shown in FIG., power network end switch circuit 400 is electrically coupled to power transfer module 100 in some embodiments
In power network end change-over circuit 160 and power network 300 between.When power transfer module 100 and 300 grid-connected operating of power network, power supply
The output current Io of modular converter 100 powers via the power network end switch circuit 400 of conducting to power network 300.Relatively, in power network
300 it is abnormal when, power network end switch circuit 400 accordingly selectively turns off, and uses isolation power network end change-over circuit 160 and power network
300。
Thereby, when abnormal situation, which occurs, for the power down of power network 300 or power quality occurs, power network end switch circuit 400
It can be turned off via corresponding control strategy, with the equipment of protection power source modular converter 100 and electricity generation module 220,240.It is similar
Ground, system also can be when detecting that power transfer module 100 and electricity generation module 220,240 occur abnormal, and control power network end is opened
Powered-down road 400 turns off, and power transfer module 100 and electricity generation module 220,240 is cut off into civil power, it is ensured that the system of power network 300
It is stable.Thereby, by setting the automatic separating when detecting failure or abnormality of power network end switch circuit 400, can avoid
Equipment is damaged or the further deterioration of stabilization of power grids degree.
In addition, in some embodiments, power network end change-over circuit 160 is more to be electrically coupled to local load 900, with right
The power supply of locality load 900.Even if consequently, it is possible to power transfer module 100 and electricity generation module 220,240 not with power network 300 simultaneously
Connection, the pattern of island movement is still operable in, load current Iload is directly provided to locality load 900, to provide local load
Electric power needed for 900.It is worth noting that, other function electricity can be set in some embodiments, in power transfer module 100
Road is carried with ensuring that power transfer module 100 loads 900 in the pattern of island movement with the operation of electricity generation module 220,240 to locality
For stable load current Iload.
As shown in figure 5, in some embodiments, power transfer module 100 further includes energy storage end change-over circuit 130 and storage
Can device 150.Specifically, energy storage end change-over circuit 130 can include DC change-over circuit, and energy storage device 150 can include
The power storage equipments such as battery.In structure, energy storage end change-over circuit 130 be electrically coupled to node N1 and energy storage device 150 it
Between.Consequently, it is possible to which energy storage end change-over circuit 130 can provide node N1 energy storage electric current I3, or energy storage electricity is received from node N1
I3 is flowed with to the discharge and recharge of energy storage device 150, to maintain node N1 voltage quasi position Vbus stabilization.
In other words, energy storage end change-over circuit 130 can realize that two-way electric power passes between node N1 and energy storage device 150
It is defeated, with the power balance of the operation maintenance system for power network end change-over circuit 160 of arranging in pairs or groups.Energy storage end change-over circuit 130 can pass through control
Drive circuit 180 processed is controlled.Specifically, in the present embodiment, the exportable drive signal DS1 of drive circuit 180 is controlled
Outside the operation that power network end change-over circuit 160 is controlled to power network end change-over circuit 160, more exportable drive signal DS2 to energy storage
Change-over circuit 130 is held, to control energy storage electric current I3 by energy storage end change-over circuit 130, adjusts exported from node N1 to storage according to this
The energy storage electric current I3 of energy end change-over circuit 130 size, or exported from energy storage end change-over circuit 130 to node N1 energy storage electricity
Flow I3 size.
For example, under the sunny, advantage such as wind-force is plentiful, the generating at generating end needed for power network 300 than adjusting
In the case that electric power needed for the electric power of degree and local load 900 is more, additional power that electricity generation module 220,240 is sent
Can be delivered in energy storage device 150 and stored via energy storage end change-over circuit 130 from node N1 in the form of energy storage electric current I3, avoid because
Generate electricity excessively by energy accumulation on circuit, and then cause node N1 voltage quasi position Vbus acute variations.
Relatively, under the unfavorable conditions such as light-shielding, the abatement of wind, the generation deficiency at generating end is to supply power network 300
During electric power needed for the electric power of required scheduling and local load 900, power network end change-over circuit 160 can be by node N1 from energy storage
Hold change-over circuit 130 to receive energy storage electric current I3, avoid because generation deficiency causes node N1 voltage quasi position Vbus acute variations.By
This, stored electric power can export via energy storage end change-over circuit 130 in energy storage device 150, and change electricity by power network end
Road 160 is converted to appropriate frequency and alternating current to the power network 300 and locality of phase loads 900 even load ends.
Consequently, it is possible in the case of electricity generation module 220,240 and the 300 grid-connected operating of power transfer module 100 and power network,
The power that power network 300 receives from power network end change-over circuit 160 can be stablized relatively, avoid because of the generating of electricity generation module 220,240
Amount changes and causes the violent variation of power, and then damages the power quality of power network 300.In addition, electricity generation module 220,240 with
The island movement of power transfer module 100, without and in the case that power network 300 is grid-connected, power transfer module 100 also can be by energy storage
Device 150 realizes the load balance on circuit, will when electricity generation module 220,240 generated energy are higher than 900 power consumption of local load
Excrescent electric power is stored in energy storage device 150, and when electricity generation module 220,240 generated energy are less than 900 power consumption of local load
The energy stored by energy storage device 150 supplies the part of generation deficiency, to maintain stable power supply quality.
It is worth noting that, energy storage end change-over circuit 130 in the embodiment shown in fig. 5 can also use various suitable electricity
Power electronic component is (such as：Igbt etc.), and realized by various types of exchangeable type power supply circuit.In addition,
Power network end switch circuit 400 can also be realized by various types of electronic power switch device.
In summary, in above-mentioned each embodiment, power network end change-over circuit 160 can be by controlling drive circuit 180
Control realizes node N1 with load end (such as：The transmitted in both directions of electric power between power network 300 or local load 900), and control according to this
Node N1 processed voltage quasi position Vbus.In addition, in some embodiments, energy storage end change-over circuit 130 can be by controlling driving electricity
The transmitted in both directions of electric power between node N1 and energy storage device 150 is realized in the control on road 180.Thereby, by controlling drive circuit 180
Suitable control, generating end change-over circuit 120,140 export electric current I1, I2, what energy storage end change-over circuit 130 was exported or received
The electric current Io and/or load current Iload that energy storage electric current I3 can be received with load end reach energy balance.
Simultaneously, because generating end change-over circuit 120,140 is not necessary to be controlled node N1 voltage quasi position Vbus,
Therefore the circuit design of high frequency can be used, and then reduces volume, reduces cost.In addition, also can effectively reduce on circuit and
Copper loss, iron loss in change-over circuit etc. are lost.Thereby, no matter system is in fully loaded or unloaded, can all have higher energy
Conversion efficiency.
Furthermore it is noted that in the case where not conflicting, in each schema of present invention, embodiment and implementation
Feature in example can be mutually combined with circuit.Depicted circuit is merely illustrative in above-mentioned schema is used, and simplifies so that explanation
Succinctly and readily appreciate, and be not used to the limitation present invention.
It refer to Fig. 6.Fig. 6 is the control method 600 of the electricity generation system according to depicted in present invention section Example
Flow chart.For convenience and for the sake of clear explanation, following control methods 600 are to coordinate Fig. 1~embodiment illustrated in fig. 5 to be said
It is bright, but be not limited, any those skilled in the relevant technical field, without departing from the spirit and scope of the present invention, when
Can be to making various changes and retouching.As shown in fig. 6, control method 600 includes step S610, S620, S630 and S640.In portion
Divide in embodiment, control method 600 can further include step S650 and S660.In some embodiments, control method 600
It can further include step S670 and S680.
First, in step S610, input voltage vin 1 is received by generating end change-over circuit 120, and according to input voltage
Vin1 produces electric current I1.In different embodiments, input voltage vin 1 can be direct current or friendship according to power source difference
Flow electric form.Specifically, in some embodiments, the PV1 operations of control solar energy module can be included in step S610 in maximum
Power points, to receive the input voltage vin 1 of DC voltage from solar energy module PV1.For example, can be by step S610
The DC converting unit 122a control solar energy modules PV1 of generating end change-over circuit 120 is operated in maximum power point.Connect
, DC current Ia is exported according to input voltage vin 1 by DC converting unit 122a.Finally, by generating end change-over circuit
120 DC converting unit 124, according to DC current Ia output currents I1 to node N1.
In addition, the WT1 operations of control wind-driven generator can be included in other parts embodiment, in step S610 in maximum work
Rate point, to receive the input voltage vin 1 of alternating voltage from wind-driven generator WT1.For example, can be by sending out in step S610
The AC DC converting unit 122c of electric end change-over circuit 120, the WT1 operations of control wind-driven generator are in maximum power point.Then,
DC current Ic is exported according to input voltage vin 1 by AC DC converting unit 122c.Finally, by generating end change-over circuit 120
DC converting unit 124, according to DC current Ic output currents I1 to node N1.
Then, in step S620, by the output drive signal DS of control drive circuit 180 to power network end change-over circuit 160.
As described in the previous paragraph, in some embodiments, power network end change-over circuit 160 is coupled to section with generating end change-over circuit 120
Point N1.
Then, in step S630, by power network end change-over circuit 160, according to drive signal DS control nodes N1 electricity
Press level Vbus.Specifically, power network end change-over circuit 160 can control node N1 voltage quasi position Vbus voltage class to be in
Middle pressure (MV) grade.Consequently, it is possible to the loss on circuit can be reduced.
Finally, in step S640, electric current I1 is converted into exchange electricity output to power network by power network end change-over circuit 160
300.For example, in some embodiments, step S630 can include changes list by the DC-AC of power network end change-over circuit 160
Member, the alternating current with frequency with phase with power network 300 is exported, to be powered to power network 300.
In addition, in some embodiments, control method 600 can also include and receive input electricity by generating end change-over circuit 140
Vin2 is pressed, and according to the output current I2 of input voltage vin 2, and by power network end change-over circuit 160, electric current is received from node N1
I1 is with electric current I2 and is converted to electric current I1 and electric current I2 and exchanges electricity output to power network 300.Its concrete operations is in previous paragraph
It is middle to coordinate multiple embodiments to describe in detail, therefore do not repeated then at this.
In some embodiments, control method 600 further includes step S650 and step S660, and being generated electricity with control is
System operation is in island movement pattern.For example, in step S650, when power network 300 is abnormal, electrical coupling is selectively turned off
The power network end switch circuit 400 being connected between power network end change-over circuit 160 and power network 300, use isolation power network end change-over circuit
160 and power network 300.Then, in step S660, electric current I1 is converted into alternating current with to working as by power network end change-over circuit 160
The power supply of ground load 900.Even if consequently, it is possible in the case where being de-connected with power network 300, electricity generation system still can be by island movement mould
Formula is to the power supply of locality load 900.
In some embodiments, control method 600 further includes step S670 and step S680, with energy storage dress of arranging in pairs or groups
150 are put to be operated.For example, in step S670, node N1 is provided by energy storage end change-over circuit 130 or is connect from node N1
Storing up can electric current I3.In step S680, by the output drive signal DS2 of control drive circuit 180 to energy storage end change-over circuit
130, to control energy storage electric current I3 by energy storage end change-over circuit 130, adjust to export to power network end from node N1 according to this and change electricity
The size of current on road 160.Consequently, it is possible to electricity generation system can carry out discharge and recharge by energy storage electric current I3 to energy storage device 150, with
The equilibrium of supply and demand of maintenance system.
Art tool usually intellectual can be directly acquainted with how this control method 600 is based on above-mentioned multiple differences
Electricity generation system in embodiment is to perform such operation and function, therefore no longer this is repeated.
In addition, although disclosed method is shown and described as into a series of step or event herein, should manage
The order of solution, these shown steps or event should not be construed as limited significance.For example, part steps can be with different order
Occur and/or occur simultaneously with other steps in addition to step or event illustrated herein and/or described or event.Separately
Outside, when implementing one or more aspects or embodiment described herein, and not all is all required the step of this shows.This
Outside, one or more steps herein may also perform in one or more the step of separating and/or in the stage.
In summary, present invention is changed by above-mentioned multiple embodiments by the direct current of middle pressure (MV) grade
Energy transmission in device module.Online line loss is transmitted consequently, it is possible to can reduce, the overall conversion effect of lifting system
Rate.Further, since the conversion module in present invention passes through power network end change-over circuit by drive circuit output drive signal
The voltage quasi position of control node and the frequency and phase of the output current of feed-in power network, therefore generating end change-over circuit can use height
Frequencyization circuit design.Consequently, it is possible to the problems such as cost reduction for the end change-over circuit that generates electricity, volume-diminished, copper loss, iron loss reduction,
Minimize and more save so that conversion module is realized.
Although present invention with embodiment invention as above, so its be not limited to present invention, it is any ripe
Know the person skilled of this area, in the spirit and scope for not departing from present invention, when can make it is various change and retouching,
But these change should all be contained in the protection domain of appended claims of the present invention with retouching.
Claims (20)
1. a kind of power transfer module, it is characterised in that include：
One first generating end change-over circuit, to receive an input voltage, and one first electric current is exported according to the input voltage；
One power network end change-over circuit, the first generating end change-over circuit is electrically coupled in a node, to receive first electricity
Flow and one power network is powered according to first electric current；And
One control drive circuit, to export a drive signal to the power network end change-over circuit, to change electricity by the power network end
Road controls the voltage quasi position of the node, and the wherein voltage class of the node is middle pressure grade.
2. power transfer module as claimed in claim 1, it is characterised in that the first generating end change-over circuit is controlling one
Solar energy module is operated in a maximum power point, and to receive the input voltage from the solar energy module, wherein the input voltage is
DC voltage.
3. power transfer module as claimed in claim 2, it is characterised in that the first generating end change-over circuit includes：
One first DC converting unit, to control solar energy module operation in the maximum power point, and it is defeated according to this
Enter the DC current of voltage output one；And
One second DC converting unit, it is electrically connected between the first DC converting unit and the node, to
First electric current is exported to the node according to the DC current.
4. power transfer module as claimed in claim 3, it is characterised in that the second DC converting unit include one every
Release DC to DC converter, to provide being galvanically isolated between the solar energy module and the power network end change-over circuit.
5. power transfer module as claimed in claim 1, it is characterised in that the first generating end change-over circuit is controlling one
Wind-driven generator is operated in a maximum power point, and to receive the input voltage from the wind-driven generator, wherein the input voltage is
Alternating voltage.
6. power transfer module as claimed in claim 5, it is characterised in that the first generating end change-over circuit includes：
One AC DC converting unit, to control wind-driven generator operation in the maximum power point, and according to input electricity
Pressure one DC current of output；And
One direct current DC conversion unit, it is electrically connected between the AC DC converting unit and the node, to straight according to this
Stream electric current exports first electric current to the node.
7. power transfer module as claimed in claim 1, it is characterised in that the power network end change-over circuit includes a DC-AC
Converting unit, the DC-AC converting unit is to export the alternating electromotive force with the power network with frequency with phase, to be powered to the power network.
8. power transfer module as claimed in claim 1, it is characterised in that further include：
One second generating end change-over circuit, to receive one second input voltage, and according to second input voltage output 1 the
Two electric currents；
Wherein the power network end change-over circuit is electrically coupled to the second generating end change-over circuit in the node, to receive this second
Electric current is simultaneously powered according to first electric current and second electric current to the power network.
9. power transfer module as claimed in claim 1, it is characterised in that further include：
One energy storage device；And
One energy storage end change-over circuit, is electrically coupled between the node and the energy storage device, to provide the node or from the section
Point receives an energy storage electric current with to the energy storage device discharge and recharge；
Wherein the control drive circuit is more to export one second drive signal to the energy storage end change-over circuit, to pass through the energy storage
End change-over circuit controls the energy storage electric current, adjusts exported from the node to the size of current of the power network end change-over circuit according to this.
10. a kind of electricity generation system, it is characterised in that include：
One electricity generation module；And
One power transfer module, comprising：
One first generating end change-over circuit, is electrically coupled to the electricity generation module, to receive an input voltage from the electricity generation module,
And one first electric current is exported according to the input voltage；
One power network end change-over circuit, the first generating end change-over circuit is electrically coupled in a node, to receive first electricity
Flow and one power network is powered according to first electric current；And
One control drive circuit, to export a drive signal to the power network end change-over circuit, to change electricity by the power network end
Road controls the voltage quasi position of the node.
One power network end switch circuit, is electrically coupled between the power network end change-over circuit and the power network, to abnormal in the power network
When selectively turn off, use and isolate the power network end change-over circuit and the power network.
11. electricity generation system as claimed in claim 10, it is characterised in that the power network end change-over circuit is more being electrically coupled to
One local load, with to the local load supplying.
12. a kind of control method of electricity generation system, it is characterised in that include：
One input voltage is received by one first generating end change-over circuit, and one first electric current is produced according to the input voltage；
By one control drive circuit, export a drive signal to a power network end change-over circuit, wherein the power network end change-over circuit with
The first generating end change-over circuit is coupled to a node；
By the power network end change-over circuit, the voltage quasi position of the node is controlled according to the drive signal；And
First electric current is converted into exchange electricity output to a power network by the power network end change-over circuit.
13. control method as claimed in claim 12, it is characterised in that by the first generating end change-over circuit produce this
The step of one electric current, includes：
Control a solar energy module to operate in a maximum power point, to receive the input voltage from the solar energy module, wherein should
Input voltage is DC voltage.
14. control method as claimed in claim 13, it is characterised in that by the first generating end change-over circuit produce this
The step of one electric current, further includes：
By one first DC converting unit of the first generating end change-over circuit, the solar energy module is controlled to operate at this most
High-power point；
One DC current is exported according to the input voltage by the first DC converting unit；And
By one second DC converting unit of the first generating end change-over circuit, first electricity is exported according to the DC current
It flow to the node.
15. control method as claimed in claim 12, it is characterised in that by the first generating end change-over circuit produce this
The step of one electric current, includes：
Control a wind-driven generator to operate in a maximum power point, to receive the input voltage from the wind-driven generator, wherein should
Input voltage is alternating voltage.
16. control method as claimed in claim 15, it is characterised in that by the first generating end change-over circuit produce this
The step of one electric current, further includes：
By an AC DC converting unit of the first generating end change-over circuit, wind-driven generator operation is controlled in the maximum work
Rate point；
One DC current is exported according to the input voltage by the AC DC converting unit；And
By a direct current DC conversion unit of the first generating end change-over circuit, first electric current is exported extremely according to the DC current
The node.
17. control method as claimed in claim 12, it is characterised in that turned first electric current by the power network end change-over circuit
Be changed to exchange electricity output to the step of power network include：
By a direct current AC conversion unit of the power network end change-over circuit, the alternating current with frequency with phase with the power network is exported, with right
The power network is powered.
18. control method as claimed in claim 12, it is characterised in that further include：
One second input voltage is received by one second generating end change-over circuit, and according to the electricity of second input voltage output one second
Stream；And
By the power network end change-over circuit, receive first electric current with second electric current from the node and by first electric current and this
Two electric currents are converted to exchange electricity output to the power network.
19. control method as claimed in claim 12, it is characterised in that further include：
When the power network exception, the power network being electrically coupled between the power network end change-over circuit and the power network is selectively turned off
End switch circuit, use and isolate the power network end change-over circuit and the power network；And
First electric current is converted into alternating current with to a local load supplying by the power network end change-over circuit.
20. control method as claimed in claim 12, it is characterised in that further include：
The node is provided by an energy storage end change-over circuit or receives an energy storage electric current from the node；And
One second drive signal is exported to the energy storage end change-over circuit by the control drive circuit, to change electricity by the energy storage end
Road controls the energy storage electric current, adjusts exported from the node to the size of current of the power network end change-over circuit according to this.
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| CN114833829A (en) * | 2022-04-25 | 2022-08-02 | 阳光电源（上海）有限公司 | Control method and device of photovoltaic cleaning robot and photovoltaic cleaning robot |
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