CN104079194B - Electric energy conversion system and method - Google Patents
Electric energy conversion system and method Download PDFInfo
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- CN104079194B CN104079194B CN201310109147.XA CN201310109147A CN104079194B CN 104079194 B CN104079194 B CN 104079194B CN 201310109147 A CN201310109147 A CN 201310109147A CN 104079194 B CN104079194 B CN 104079194B
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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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Abstract
The present invention discloses a kind of electric energy conversion system, and it includes source transducer, line side transducer and electric energy switching controller.The electric energy that this source transducer is used for providing power supply module is converted to unidirectional current.This line side transducer is used for for this unidirectional current being converted to alternating current.This electric energy switching controller is connected and communicates with this source transducer and this line side transducer.This electric energy switching controller includes decomposing module, source control module and line side control module.This decomposing module is used for for feedback d. c. voltage signal being decomposed into first voltage component signal and second voltage component signal.Present invention further teaches a kind of electric energy conversion system control method.Electric energy conversion system and electric energy conversion system control method that the present invention discloses, can optimize the output response of DC bus-bar voltage by controlling the method for this source transducer and this line side transducer simultaneously.
Description
Technical field
Embodiment disclosed by the invention is related to electric energy conversion system and method, with for controlling DC bus-bar voltage.
Background technology
With the growth to new forms of energy such as solar energy demand, the photovoltaic system based on photovoltaic effect more and more by with
In converting the solar into electric energy.Photovoltaic system typically to realize energy conversion using multiple electronic power switch devices.Generally,
Solar panel is connected to the source of photovoltaic system as input power, for converting the solar into electric energy, then should
This electric energy can be converted to the required electric energy of line side load by photovoltaic system.Electrical network is widely used as the load of photovoltaic system, with
Required electric energy in offer life.Typical photovoltaic system includes dc bus, and this dc bus is connected to source and line side
Between, it is one of key technology of electric energy transformation process that the DC bus-bar voltage at dc bus two ends controls.
Therefore, it is necessary to provide a kind of improved system and method to solve above-mentioned technical problem.
Content of the invention
In view of above mentioned technical problem, one aspect of the present invention is to provide a kind of electric energy conversion system, this electricity
Converting system can include source transducer, line side transducer, dc bus and electric energy switching controller.This source transducer is used for
The electric energy that power supply module is provided is converted to unidirectional current.This line side transducer is connected with this source transducer, and this line side is changed
Device is used for for this unidirectional current being converted to alternating current.This dc bus is connected between this source transducer and this line side transducer.
And this electric energy switching controller is connected and communicates with this source transducer and this line side transducer, this electric energy switching controller
Including decomposing module, source control module and line side control module.This decomposing module is used for will be female for this direct current of the representative detecting
The feedback d. c. voltage signal of line both end voltage is decomposed into first voltage component signal and second voltage component signal.This source control
Molding block generates the source control signal being supplied to this source transducer at least based on this first voltage component signal.This line side control
Molding block generates the line side control signal being supplied to this line side transducer at least based on this second voltage component signal.
Electric energy conversion system as above, this electric energy conversion system also includes maximum power tracing circuit, this maximum work
Rate is followed the trail of circuit and is used for following the trail of the peak power of this power supply module.
Electric energy conversion system as above, wherein this decomposing module includes high pass filter and low pass filter.This height
Bandpass filter is used for for this feedback d. c. voltage signal being decomposed into frequency voltage components signal, and this low pass filter is used for this is anti-
Feedback d. c. voltage signal is decomposed into low-frequency voltage component signal.This frequency voltage components signal is used as this first voltage component to be believed
Number, this low-frequency voltage component signal is used as this second voltage component signal.
Electric energy conversion system as above, wherein this source control module includes the first outer shroud control loop, and this first
Outer shroud control loop is used for controlling this first voltage component signal to follow first voltage command signal, this first voltage command signal
It is zero command signal.
Electric energy conversion system as above, wherein this source control module includes the first internal ring control loop, and this first
Internal ring control loop is used for controlling source feedback DC current signal to follow source current command signal.
Electric energy conversion system as above, wherein this source control module includes the first internal ring control loop, and this first
Internal ring control loop is used for controlling source feedback d. c. voltage signal to follow Source side voltage command signal.
Electric energy conversion system as above, wherein this source control module includes the first internal ring control loop, and this first
Internal ring control loop is used for controlling source feedback DC power signal to follow source power instruction signal.
Electric energy conversion system as above, wherein this line side control module is included in the second outer shroud control loop and second
Ring control loop, this second outer shroud control loop is used for controlling this second voltage component signal to follow second voltage command signal,
This second internal ring control loop is used for controlling this line side feedback power signal to follow line side power instruction signal, and this second voltage refers to
Signal is made to be constant command signal.
Another aspect of the present invention is to provide a kind of electric energy conversion system control method, and the method includes walking as follows
Suddenly：Measurement dc bus both end voltage simultaneously obtains feeding back d. c. voltage signal.By decomposing module, this feedback DC voltage is believed
Number it is decomposed into first voltage component signal and second voltage component signal.By source control module at least based on this first voltage
Component signal generates source control signal, for controlling source transducer.And by line side control module at least based on this
Second voltage component signal generates line side control signal, for controlling line side transducer.
Electric energy conversion system control method as above, wherein this decomposition step include by high pass filter, this is anti-
Feedback d. c. voltage signal is decomposed into high-frequency voltage signal, by low pass filter, this feedback d. c. voltage signal is decomposed into low frequency
Voltage signal.This high-frequency voltage signal is used as this first voltage component signal, and this low-frequency voltage signal divides as this second voltage
Amount signal.
Electric energy conversion system control method as above, the step wherein generating this source control signal is included by the
One outer shroud control loop adjusts this first voltage component signal and follows first voltage command signal.
Electric energy conversion system control method as above, the step wherein generating this source control signal is included by the
One internal ring control loop adjusts source feedback DC current signal and follows source current command signal.
Electric energy conversion system control method as above, the step wherein generating this source control signal is included by the
One internal ring control loop adjusts source feedback d. c. voltage signal and follows source DC voltage command signal.
Electric energy conversion system control method as above, the step wherein generating this source control signal is included by the
One internal ring control loop adjusts source feedback DC power signal and follows source dc power command signal.
Electric energy conversion system control method as above, the step wherein generating this line side control signal includes：Pass through
Second outer shroud control loop adjusts this second voltage component signal and follows second voltage command signal.And pass through the second internal ring control
Loop modulation line side feedback power signal processed follows line side power instruction signal.
It is another aspect of the invention to provide a kind of photovoltaic energy conversion system.This photovoltaic energy conversion system is included
High-power tracking circuit, photovoltaic side transducer, load-side transducer, dc bus and electric energy switching controller.This peak power
Follow the trail of circuit to be used for following the trail of the peak power of photo-voltaic power supply module.This photovoltaic side transducer is connected with this photo-voltaic power supply module,
The electric energy that this photovoltaic side transducer is used for providing this photo-voltaic power supply module is converted to unidirectional current.This load-side transducer and this light
Volt side transducer is connected, and this load-side transducer is used for for this unidirectional current being converted to alternating current.This dc bus is connected to this
Between photovoltaic side transducer and this load-side transducer.And this electric energy switching controller and this photovoltaic side transducer and load-side
Transducer is connected and communicates, and this electric energy switching controller includes decomposing module, and photovoltaic side control module and load-side control mould
Block.This decomposing module is used for for the feedback d. c. voltage signal of this DC bus-bar voltage of the representative detecting being decomposed into first voltage
Component signal and second voltage component signal.This photovoltaic side control module generates photovoltaic at least based on this first voltage component signal
Side control signal.And this load-side control module generates load-side control signal at least based on this second voltage component signal.
The present invention provide electric energy conversion system and electric energy conversion system control method compared with traditional method, by source
Side transducer controls and the control of line side transducer combines, and the HFS in DC bus-bar voltage is controlled by source transducer
System, the low frequency part in DC bus-bar voltage is controlled by line side transducer.This Collaborative Control source transducer and line side
The method of transducer can ensure that DC bus-bar voltage has quick, accurate, stable response output.
Brief description
By combining accompanying drawing, embodiments of the present invention are described, the present invention may be better understood, in accompanying drawing
In：
Fig. 1 show a kind of module map of embodiment of electric energy conversion system.
Fig. 2 show the voltage-to-current of photovoltaic cell（C-V characteristic）Characteristic curve schematic diagram.
Fig. 3 show a kind of embodiment schematic diagram of decomposing module in electric energy conversion system as shown in Figure 1.
Fig. 4 show a kind of control block diagram of source control module in electric energy conversion system as shown in Figure 1.
Fig. 5 show another kind of control block diagram of source control module in electric energy conversion system as shown in Figure 1.
Fig. 6 show another kind of control block diagram of source control module in electric energy conversion system as shown in Figure 1.
Fig. 7 show a kind of control block diagram of line side control module in electric energy conversion system as shown in Figure 1.
Fig. 8 show power supply module output voltage as shown in Figure 1 and occurs during disturbance to apply three kinds of different control methods
The DC bus-bar voltage response curve schematic diagram producing in electric energy conversion system as shown in Figure 1.
Fig. 9 show the method flow diagram controlling electric energy conversion system as shown in Figure 1.And
Figure 10 show a kind of sub-step flow chart of the embodiment illustrating decomposition step as shown in Figure 9.
Specific embodiment
One or more specific embodiment of the present invention explained below.Firstly it is pointed out that in these enforcements
During the specific descriptions of mode, in order to carry out brief and concise description, this specification can not possibly be to actual embodiment
All features all describe in detail.It is to be understood that in the actual implementation process of any one embodiment, just
As during any one engineering project or design object, in order to realize the objectives of developer, or in order to full
The restriction that pedal system is related or business is related, usually can make various concrete decision-makings, and this also can be from a kind of real
Mode of applying changes between another embodiment.Although moreover, it is to be understood that being made in this development process
The effort going out is probably complicated and tediously long, but the ordinary skill for this area related to present disclosure
For personnel, some carrying out on the basis of the technology contents that the disclosure discloses design, and the change such as manufacture or produce and be
Conventional technique means, are not construed as present disclosure insufficient.
Unless otherwise defined, the technical term using in the present specification and claims or scientific terminology should be
There is in the technical field of the invention the ordinary meaning that the personage of general technical ability is understood.This specification and claims
Used in " first " or " second " and similar word be not offered as any order, quantity or importance, and be
It is used for distinguishing different ingredients.The similar word such as " one " or " one " is not offered as quantity and limits, but represents and exist
At least one."or" include in cited project any one or all.The word that " connection " or " being connected " etc. are similar to
Language is not limited to physics or machinery connection, but can include electrical connection, no matter being direct or indirect
's.Additionally, " circuit " and " control module " etc. can include single component or by multiple active members or passive device
The set being directly or indirectly connected, such as one or more IC chip, to provide the function of corresponding description.
"available" used in the present invention, " can " show the possibility of event generation in certain environments with words such as " possible "
Property.Have a kind of particular community, feature or function.And/or by with a certain qualified verb conjugations represent one or more abilities,
Performance or probability.Responsively, the use of " possible " shows：Adorned term for shown ability, function or purposes is
Substantially suitably, can mate or suitably.Simultaneously take account of the presence in some situations, adorned term there may come a time when discomfort
When mismatch or improper.For example, in some cases, a certain result or performance expectability can occur.And in other situations
Under, this result or performance may occur without.This difference is embodied by the word representing " possible ".
Fig. 1 show a kind of module map of embodiment of electric energy conversion system of present invention announcement.As shown in figure 1, should
Electric energy conversion system 10 includes source transducer 14, line side transducer 16, dc bus 15 and electric energy switching controller 18.Such as
In embodiment shown in Fig. 1, this dc bus 15 is connected between this source transducer 14 and this line side transducer 16.This electricity
Energy switching controller 18 and this source transducer 14, this line side transducer 16 is connected and communicates with this dc bus 15.This electricity
Can switching controller 18 be used for controlling this source transducer 14 and this line side transducer 16 to maintain this dc bus 15 two ends
DC voltage（Vdc）In a particular value or particular range.
As shown in figure 1, this source transducer 14 is connected with power supply module 12, for what this power supply module 12 was produced
First electric energy is converted to the second electric energy on this dc bus 15.This source transducer 14 may include multiple switch device（Figure is not
Illustrate）As mos field effect transistor（MOSFETs）And/or insulated gate bipolar transistor（IGBTs）.
In some embodiments, this power supply module 12 is DC source module, and this source transducer 14 includes direct current/straight
Stream power converter, this first electric energy for producing this power supply module 12 is converted to the second of this dc bus 15 two ends
Electric energy.In some embodiments, this dc/dc power transducer includes booster circuit, reduction voltage circuit or other any can
A kind of direct current energy is converted to the circuit of another kind of direct current energy.In one kind more specifically embodiment, this power supply module
12 include sun-generated electric power module such as solar panel or battery modules such as fuel cell.
In some embodiments, this power supply module 12 is alternating current power supply module, and this source transducer 14 includes exchange/straight
Stream power converter, the AC energy for producing this power supply module 12 is converted to the unidirectional current at this dc bus 15 two ends
Energy.In some embodiments, this AC/DC power transducer includes H bridge transducer, three-phase commutation bridge or other any can
AC energy is converted to the circuit of direct current energy.In one kind more specifically embodiment, this power supply module 12 includes blower fan
And/or alternating current generator.
As shown in figure 1, this line side transducer 16 is connected with load 17.This line side transducer 16 is used for turning direct current energy
It is changed to AC energy, then this AC energy is supplied to this load 17（Such as electrical network）.This line side transducer 16 may include many
Individual switching device（Not shown）As mos field effect transistor（MOSFETs）And/or insulated gate bipolar
Transistor（IGBTs）.In some embodiments, this line side transducer 16 includes H bridge transducer, three-phase inverter or other
Direct current energy can be converted to the circuit of AC energy by what.
In embodiment as shown in Figure 1, this power supply module 12 includes photo-voltaic power supply module such as least one set solar energy
Cell panel.The factors such as illumination, temperature and impedance can lead to solar panel to have non-linear output characteristic, this nonlinear object
Characteristic can use voltage-current curve 65 as shown in Figure 2 to represent.This voltage-current curve 65 shows under the conditions of particular light
The non-linear output characteristic of solar panel.Dash area 66 represents the output of this power supply module 12.VopenRepresent and work as
Output current I is open-circuit voltage when zero.IshortRepresent the short circuit current when output voltage is zero.Pmpp, Vmpp, and ImppPoint
Not Biao Shi maximum power point power, voltage and current.
As shown in figure 1, this electric energy conversion system 10 may include low pass filter 13, this low pass filter 13 is connected to this electricity
Between source module 12 and this source transducer 14.This low pass filter 13 is used for filtering the height in this power supply module 12 generation electric energy
Frequency component is with DC power output.Then this direct current energy is provided to this source transducer 14.This low pass filter 13 can
Including one or more electric capacity and/or inductance.
In embodiment as shown in Figure 1, this electric energy conversion system 10 may include maximum power tracing circuit 20, and this is
High-power tracking circuit 20 can under any given environmental condition to ensure this power supply module 12 for following the tracks of maximum power point
Maximum Power Output.In embodiment as above, one or more sensors such as current sensor and voltage sensor
Device is used for the measurement electrical quantity related to this electric energy conversion system 10.This one or more sensor this peak power exportable chases after
Track circuit 20 and this discernible signal of electric energy switching controller 18.In some embodiments, sensor includes resistance, Hall
Effect sensor and Fibre Optical Sensor.
In some embodiments, current sensor 56 is used for measuring electric current the output current of the generation of this power supply module 12
Signal feeds back DC current signal as source（Idc_source_fbk）57.Voltage sensor 58 is used for measuring this power supply module 12 and produces
Raw voltage output voltage signal feeds back d. c. voltage signal as source（Vdc_source_fbk）59.This maximum power tracing electricity
DC current signal I is fed back according at least to this source in road 20dc_source_fbk57 feed back d. c. voltage signal with this source
Vdc_source_fbk59 obtain maximum power point reference signal 30.This maximum power point reference signal 30 may include maximum power point work(
Rate reference signal P* mpp, maximum power point voltage reference signal V* mpp, and/or maximum power point current reference signal I* mpp.P* mpp, V* mpp, and I* mppShow this power supply module 12 in maximum power point work and Maximum Power Output point given or reference
Power, voltage and current.
A kind of direct current bus voltage control method is used for maintaining the DC voltage V at this dc bus 15 two endsdcIn a spy
In definite value or particular range.Control signal according to the offer of this electric energy switching controller 18 is come this source transducer 14 of Collaborative Control
With this line side transducer 16 to obtain desired DC bus-bar voltage.In some embodiments, this electric energy switching controller 18
Any suitable programmable circuit or device can be included, including digital signal processor（Digital Signal
Processor, DSP）, field programmable gate array（Field Programmable Gate Array, FPGA）, programmable patrol
Collect controller（Programmable Logic Controller, PLC）And special IC（Application
Specific Integrated Circuit, ASIC）Deng.This electric energy switching controller 18 can be tied with hardware, software or software and hardware
The form closed is implemented.
In view of the bandwidth that as the limited power delivering capability in source of the restriction on hardware and line side are limited, this dc bus
The DC bus-bar voltage at 15 two ends controls to be realized by this source transducer 14 of Collaborative Control and this line side transducer 16.More
Body ground, this electric energy switching controller 18 includes decomposing module 24, source control module 22 and line side control module 26.
In embodiment as shown in Figure 1, first voltage sensor 60 is used for detecting the straight of this dc bus 15 both sides
Stream voltage VdcAnd export feedback d. c. voltage signal（Vdc_fbk）40.One or more second voltage sensors 62 are used for detecting
This electrical network 17, in the three-phase voltage of any point between this line side transducer 16, or electrical network 17 and line side transducer 16 at least
One phase voltage output voltage signal 46 give this electric energy switching controller 18.Voltage magnitude signal Vamp（Not shown）Can be based on
This voltage signal 46 is calculated in this electric energy switching controller 18.
This decomposing module 24 receives this feedback d. c. voltage signal Vdc_fbk40 and generate first voltage component signal 32 He
Second voltage component signal 34.This source control module 22 receives this first voltage component signal 32, to voltage command signal 42
With this maximum power point reference signal 30（Such as P* mpp, V* mppAnd I* mpp）And generate source control signal 50 to be supplied to this source
Side transducer 14.This line side control module 26 receives this second voltage component signal 34, second voltage command signal 44 and this electricity
Pressure signal 46 simultaneously generates line side control signal 52 to be supplied to this line side transducer 16.By this source transducer 14 of Collaborative Control
This DC bus-bar voltage can be made to obtain quick, accurate, stable response output with the method for this line side transducer 16.
In some embodiments, this decomposing module 24 is used for this feedback d. c. voltage signal Vdc_fbk40 are decomposed into two
Individual component, this two components can be two DC component, a DC component and an AC compounent or two AC compounents.
In other embodiments, this feedback d. c. voltage signal Vdc_fbk40 can be broken down into more than two component.
Embodiment as shown in Figure 3, via high pass filter 74 by this feedback d. c. voltage signal Vdc_fbk40 are decomposed into
First voltage component signal 32, via low pass filter 76 by this feedback d. c. voltage signal Vdc_fbk40 are decomposed into second voltage
Component signal 34.This first voltage component signal 32 is used as feedback signal Vdc_h_fbkIt is provided to this source control module 22.Should
Second voltage component signal 34 is used as feeding back signal Vdc_l_fbkIt is supplied to this line side control module 26.Wherein, Vdc_h_fbkRepresent
This first voltage component signal 32, Vdc_l_fbkRepresent this second voltage component signal 34.Vdc_h_fbk32 and Vdc_l_fbk34 and then quilt
It is respectively supplied to this source control module 22 and this line side control module 26.
In some embodiments, this high pass filter 74 and this low pass filter 76 can be in this electric energy switching controllers 18
The software form of middle programming is realized.In other embodiments, this high pass filter 74 and this low pass filter 76 can be using electricity
The example, in hardware of sub- device is realized.
When electric energy conversion system shown in Fig. 1 is photovoltaic energy conversion system, this power supply module 12 is photo-voltaic power supply module,
This source transducer 14 is photovoltaic side transducer, and this line side transducer 16 is load-side transducer, this electric energy switching controller 18
In this source control module 22 be photovoltaic side control module, this line side control module 26 be load-side control module, this source
Control signal 50 is photovoltaic side control signal, and this line side control signal 52 is load-side control signal.
Next will be to this control signal（Source control signal 50 and line side control signal 52）In this electric energy conversion and control
Generating process in device 18 is described in detail.
Fig. 4 show a kind of control block diagram of source control module in electric energy conversion system as shown in Figure 1.This source controls
Module 22 is used for controlling this first voltage component signal Vdc_h_fbk32 follow this first voltage command signal 42.In some embodiment party
In formula, this first voltage command signal 42 is high frequency voltage command signal（Vdc_h_cmd）.In embodiment as shown in Figure 4,
This first voltage command signal 42 is zero command signal, i.e. DC bus-bar voltage VdcIn high fdrequency components amplitude control to as far as possible
Little.Controller chassis Figure 100 of this source control module 22 includes the first outer shroud control loop 133 and the first internal ring control loop 131.
In this first outer shroud control loop 133（Or voltage control loop）In, this source control module 22 receives this first electricity
Pressure command signal Vdc_h_cmd42 and this first voltage component signal Vdc_h_fbk32.By summator 103 by Vdc_h_cmd42 Hes
Vdc_h_fbk32 make the difference and obtain first voltage error signal 106.Then this first voltage error signal 106 is admitted to outer loop voltag and adjusts
Section device 105 is supplied to the first current reference signal Δ I of this first internal ring control loop 131 for outputdc_source108.
This first internal ring control loop 131（Or current regulator）It is used for controlling source feedback DC current signal
Idc_source_fbk57 follow source current command signal Idc_source_cmd114.By summator 113 by this first current reference
Signal delta Idc_source108 and this maximum power point current reference signal I* mpp112 summations obtain this source current command signal
Idc_source_cmd114.Then pass through summator 117 by this source current command signal Idc_source_cmd114 feed back with this source
DC current signal Idc_source_fbk57 make the difference and obtain the first current error signal 118.
As shown in figure 4, rheonome 107 receive after this first current error signal 118 output voltage signal 120 to
Modem 109.In some embodiments, by by the carrier signal of this voltage signal 120 and fixed frequency or frequency conversion
（Such as triangular wave or sawtooth signal）It is compared and obtain this source control signal PWMsource50.This source control signal
PWMsource50 are then supplied to this source transducer 14 for turning on and off the multiple switch in this source transducer 14
Device.
Fig. 5 show another kind of control block diagram of source control module in electric energy conversion system as shown in Figure 1.With Fig. 4 institute
The controller chassis Figure 100 showing is similar, and the controller chassis Figure 200 shown in Fig. 5 is used for controlling this first voltage component signal Vdc_h_fbk32
Follow first voltage command signal Vdc_h_cmd42.This first voltage command signal Vdc_h_cmd42 is zero command signal.I.e. outside first
Ring control loop 233 is voltage control loop.Therefore, the specific descriptions here for this first outer shroud control loop 233 is omitted.
However, the difference that Fig. 4 and Fig. 5 is respectively shown in control block diagram is this first internal ring control loop 231.Shown in Fig. 5
Embodiment includes another voltage control loop as this first internal ring control loop 231.In embodiment as shown in Figure 5
In, this first voltage error signal 106 is admitted to outer shroud voltage regulator 105 and is supplied to the control of this first internal ring for output
The first voltage reference signal Δ V in loop 231dc_source208.
As shown in figure 5, this first internal ring control loop 231（Or voltage control loop）It is used for controlling this source feedback direct current
Voltage Vdc_source_fbk59 follow this Source side voltage command signal Vdc_source_cmd214.By summator 213 by this first electricity
Pressure reference signal Δ Vdc_source208 and this maximum power point voltage reference signal V* mpp212 summations obtain the instruction of this Source side voltage
Signal Vdc_source_cmd214.Then pass through summator 217 by this Source side voltage command signal Vdc_source_cmd214 and this source
Feedback DC voltage Vdc_source_fbk59 make the difference and obtain the first internal ring voltage error signal 218.
Internal ring voltage regulator 207 receives after this first internal ring voltage error signal 218 output voltage signal 220 to adjusting
Modulator-demodulator 209.In some embodiments, by by the carrier signal of this voltage signal 220 and fixed frequency or frequency conversion（Example
As triangular wave or sawtooth signal）It is compared and obtain this source control signal PWMsource50.This source control signal
PWMsource50 are then supplied to this source transducer 14 for turning on and off the multiple switch in this source transducer 14
Device.
Fig. 6 show another kind of control block diagram of source control module in electric energy conversion system as shown in Figure 1.With Fig. 4 institute
The controller chassis Figure 100 showing is similar, and the control block diagram 300 shown in Fig. 6 is used for controlling this first voltage component signal Vdc_h_fbk32
Follow first voltage command signal Vdc_h_cmd42.This first voltage command signal Vdc_h_cmd42 is zero command signal.I.e. outside first
Ring control loop 333 is voltage control loop.Therefore, the specific descriptions here for this first outer shroud control loop 333 is omitted.
However, the difference that Fig. 4 and Fig. 6 is respectively shown in control block diagram is this first internal ring control loop 331.Shown in Fig. 6
Embodiment include a power control loop as this first internal ring control loop 331.In embodiment as shown in Figure 6,
This first voltage error signal 106 is admitted to outer shroud voltage regulator 105 and is supplied to this first internal ring and controls back for output
The first power reference signal Δ P on road 331dc_source308.
As shown in fig. 6, this first internal ring control loop 331（Or power control loop）It is used for controlling this source feedback power
Signal Pdc_source_fbk316 follow this source power instruction signal Pdc_source_cmd314.By summator 313 by this first work(
Rate reference signal Δ Pdc_source308 and this maximum power point power reference signal P* mpp312 summations obtain this source power instruction
Signal Pdc_source_cmd314.Then pass through summator 317 by this source power instruction signal Pdc_source_cmd314 and this source
Feedback power signal Pdc_source_fbk316 make the difference and obtain the first power error signal 318.
First power governor 307 receives after this first power error signal 318 output voltage signal 320 to modulatedemodulate
Adjust device 309.In some embodiments, by by the carrier signal of this voltage signal 320 and fixed frequency or frequency conversion（Such as three
Angle ripple or sawtooth signal）It is compared and obtain this source control signal PWMsource50.This source control signal PWMsource50
It is then supplied to this source transducer 14 for turning on and off the multiple switch device in this source transducer 14.
Fig. 7 show a kind of control block diagram of line side control module in electric energy conversion system as shown in Figure 1.This control block diagram
400 are used for controlling this second voltage component signal Vdc_l_fbk34 follow this second voltage command signal 44.In some embodiments
In, this second voltage command signal 44 is low-frequency voltage command signal（Vdc_l_cmd）.In embodiment as shown in Figure 7, should
Second voltage command signal 44 is constant command signal, i.e. DC bus-bar voltage VdcIn low frequency component amplitude be controlled in constant
Value.The control block diagram 400 of this line side control module 26 includes the second outer shroud control loop 433 and the second internal ring control loop 431.
In embodiment as shown in Figure 7, in this second outer shroud control loop 433（Or voltage control loop）In, this line
Side control module 26 receives this second voltage command signal Vdc_l_cmd44 and this second voltage component signal Vdc_l_fbk34.Pass through
Summator 403 is by this second voltage command signal Vdc_l_cmd44 and this second voltage component signal Vdc_l_fbk34 make the difference and obtain
Second voltage error signal 406.Then this second voltage error signal 406 is admitted to voltage regulator 405 and carries for output
Supply the first power reference signal Δ P of this second internal ring control loop 431dc_line408.
As shown in fig. 7, this second internal ring control loop 431（Or power control loop）It is used for controlling line side Feedback of Power letter
Number Pdc_line_fbk416 follow line side power instruction signal Pdc_line_cmd414.As shown in Figure 7 in embodiment, this line side power
Feedback signal Pdc_line_fbk416 are calculated according at least to the voltage signal 46 of this electrical network 17.By summator 413 by this
One power reference signal Δ Pdc_line408 and this maximum power point power reference signal P* mpp112 summations obtain this line side power and refer to
Make signal Pdc_line_cmd414.Then pass through summator 417 by this line side power instruction signal Pdc_line_cmd414 and this line side
Power feedback signal Pdc_line_fbk416 make the difference and obtain the first current error signal 418.
Second power governor 407 receives output frequency error signal after this first current error signal 418（ωc）Give
Integrator 410.In some embodiments, this integrator 410 may include phase angle signal higher limit and lower limit.This integrator
410 according to this frequency error signal ωcOutput phase angle signal θc.In some embodiments, this integrator 410 can also be arranged
There are phase angle signal higher limit and phase angle signal lower limit, or by the clipping element of other setting to output phase angle signal θc's
Amplitude is limited.If θcExceed the phase angle signal higher limit of this integrator 410, this integrator 410 will export this phase angle letter
Number higher limit.If θcExceed the phase angle signal lower limit of this integrator 410, this integrator 410 will export under this phase angle signal
Limit value.If θcBetween the phase angle signal higher limit of this integrator 410 and lower limit, this integrator 413 will export this phase angle
Signal θc.In embodiment as shown in Figure 7, this modem 409 receives this phase angle signal θcWith this voltage magnitude signal
Vamp420 and export line side control signal PWMline52 give this line side transducer 16 for turning on and off this line side transducer
Multiple switch device in 16.
In embodiments described above, this outer shroud voltage regulator 105, this rheonome 107, this interior loop voltag
Actuator 207, this first power governor 307, this voltage regulator 405 and this second power governor 407 can passing ratios
Control algolithm, proportional plus integral control algorithm or other intelligent control algorithm forms are realized.
Fig. 8 show power supply module output voltage shown in Fig. 1 occur during disturbance three kinds of different control methods put on as
The DC bus-bar voltage response curve of the electric energy conversion system shown in Fig. 1.As shown in figure 8, the first curve 702 is to control such as Fig. 1
Shown dc bus dc bus 15 both end voltage and execute curve chart produced by the first control method existing, this control
Method processed controls this source transducer 14 to realize DC bus-bar voltage control by independent.
Second curve 704 executes existing for controlling dc bus dc bus 15 both end voltage as shown in Figure 1
Curve chart produced by two kinds of control methods, this control method controls this line side transducer 16 to realize dc bus by independent
Voltage controls.
3rd curve 706 is to control the dc bus dc bus 15 both end voltage two execution present invention as shown in Figure 1 to carry
The curve chart produced by the third control method going out, this control method passes through this source transducer 14 of Collaborative Control and this line side
Transducer 16 is realizing DC bus-bar voltage control.
Vdc_cmdRepresent this Vdc_h_cmdAnd Vdc_l_cmdSuperposition.In moment t0, the output voltage generation 5% of this power supply module 12
Disturbance, under three kinds of distinct methods control, this DC bus-bar voltage VdcThere is different degrees of oscillatory response.
More specifically, as shown in figure 8, after disturbance occurs, the recovery time of this first curve 702 is t1, this second song
The recovery time of line 704 is t2, the recovery time of the 3rd curve 706 is t3, wherein, t1>t2>t3.Result shows that the present invention carries
The third control method going out can quickly allow this DC bus-bar voltage VdcRecover steadily.Under three kinds of different control methods, with
702,704 and 706 corresponding voltage oscillation value sizes are respectively Vdc_source-Vdc_cmd, Vdc_cmd-Vdc_lineAnd Vdc_cmd-
Vdc_sourceline.Wherein, Vdc_source-Vdc_cmd>Vdc_cmd-Vdc_line>Vdc_cmd-Vdc_sourceline.With curve 702 and 704 phases
Than, when there is disturbance, 706 can be obtained using the method for this source transducer of Collaborative Control 14 and this line side transducer 16 shorter
Recovery time and less oscillation amplitude.
Fig. 9 show the method flow diagram controlling electric energy conversion system as shown in Figure 1.As shown in figure 9, in step 801,
Voltage sensor is used for detecting the voltage at this dc bus 15 two ends and exporting feedback d. c. voltage signal Vdc_fbk40.
In step 803, decomposing module 24 is used for this feedback d. c. voltage signal Vdc_fbk40 are decomposed into first voltage divides
Amount signal 32 and second voltage component signal 34.One specific embodiment of this decomposition step 803 is as shown in Figure 10.
In embodiment as shown in Figure 10, this decomposition step 803 may include sub-step 901 and 903.In sub-step
In 901, high pass filter 74 is used for this feedback d. c. voltage signal Vdc_fbk40 resolve into a frequency voltage components Vdc_h_fbk
As this first voltage component signal 32.In sub-step 903, low pass filter 76 is used for this feedback d. c. voltage signal
Vdc_fbk40 resolve into a low-frequency voltage component Vdc_h_fbkAs this second voltage component signal 34.
As shown in figure 9, in step 805, source control module 22 generates at least based on this first voltage component signal 32
Source control signal 50, for controlling source transducer 14.In step 807, line side control module 26 at least based on this
Two component of voltage signal 34 generates line side control signal 52, for controlling line side transducer 16.
Although describing the present invention in conjunction with specific embodiment, it will be appreciated by those skilled in the art that
To the present invention can many modifications may be made and modification.It is therefore contemplated that, being intended to of claims is covered in the present invention
All such modifications in true spirit and scope and modification.
Claims (16)
1. a kind of electric energy conversion system it is characterised in that：
This electric energy conversion system includes source transducer, line side transducer, dc bus and electric energy switching controller；
The electric energy that this source transducer is used for providing power supply module is converted to unidirectional current；
This line side transducer is connected with this source transducer, and this line side transducer is used for for this unidirectional current being converted to alternating current；
This dc bus is connected between this source transducer and this line side transducer；And
This electric energy switching controller is connected and communicates with this source transducer and this line side transducer, this electric energy switching controller
Including decomposing module, source control module and line side control module；This decomposing module is used for will be female for this direct current of the representative detecting
The feedback d. c. voltage signal of line both end voltage is decomposed into first voltage component signal and second voltage component signal；This source control
Molding block generates the source control signal being supplied to this source transducer at least based on this first voltage component signal；This line side control
Molding block generates the line side control signal being supplied to this line side transducer at least based on this second voltage component signal.
2. electric energy conversion system as claimed in claim 1, wherein this electric energy conversion system also include maximum power tracing circuit,
This maximum power tracing circuit is used for following the trail of the peak power of this power supply module.
3. electric energy conversion system as claimed in claim 1, wherein this decomposing module include high pass filter and low pass filter；
This high pass filter is used for for this feedback d. c. voltage signal being decomposed into frequency voltage components signal, and this low pass filter is used for will
This feedback d. c. voltage signal is decomposed into low-frequency voltage component signal；This frequency voltage components signal is used as this first voltage component
Signal, this low-frequency voltage component signal is used as this second voltage component signal.
4. electric energy conversion system as claimed in claim 1, wherein this source control module include the first outer shroud control loop, should
First outer shroud control loop is used for controlling this first voltage component signal to follow first voltage command signal, and this first voltage instructs
Signal is zero command signal.
5. electric energy conversion system as claimed in claim 4, wherein this source control module include the first internal ring control loop, should
First internal ring control loop is used for controlling source feedback DC current signal to follow source current command signal.
6. electric energy conversion system as claimed in claim 4, wherein this source control module include the first internal ring control loop, should
First internal ring control loop is used for controlling source feedback d. c. voltage signal to follow Source side voltage command signal.
7. electric energy conversion system as claimed in claim 4, wherein this source control module include the first internal ring control loop, should
First internal ring control loop is used for controlling source feedback DC power signal to follow source power instruction signal.
8. electric energy conversion system as claimed in claim 1, wherein this line side control module include the second outer shroud control loop and
Second internal ring control loop, this second outer shroud control loop is used for controlling this second voltage component signal to follow second voltage instruction
Signal, this second internal ring control loop is used for controlling line side feedback power signal to follow line side power instruction signal, this second electricity
Pressure command signal is constant command signal.
9. a kind of electric energy conversion system control method is it is characterised in that the method comprises the steps：
Measurement dc bus both end voltage simultaneously obtains feeding back d. c. voltage signal；
This feedback d. c. voltage signal is decomposed into by first voltage component signal and second voltage component signal by decomposing module；
Source control signal is generated at least based on this first voltage component signal by source control module, for controlling source
Transducer；And
Line side control signal is generated at least based on this second voltage component signal by line side control module, for controlling line side
Transducer.
10. electric energy conversion system control method as claimed in claim 9, wherein this decomposition step includes：
This feedback d. c. voltage signal is decomposed into by high-frequency voltage signal by high pass filter, this high-frequency voltage signal is used as should
First voltage component signal；
This feedback d. c. voltage signal is decomposed into by low-frequency voltage signal by low pass filter, this low-frequency voltage signal is used as should
Second voltage component signal.
11. electric energy conversion system control methods as claimed in claim 9, the step wherein generating this source control signal includes
This first voltage component signal is adjusted by the first outer shroud control loop and follows first voltage command signal.
12. electric energy conversion system control methods as claimed in claim 11, wherein generate the step bag of this source control signal
Include and source current command signal is followed by the first internal ring control loop regulation source feedback DC current signal.
13. electric energy conversion system control methods as claimed in claim 11, wherein generate the step bag of this source control signal
Include and source DC voltage command signal is followed by the first internal ring control loop regulation source feedback d. c. voltage signal.
14. electric energy conversion system control methods as claimed in claim 11, wherein generate the step bag of this source control signal
Include and source dc power command signal is followed by the first internal ring control loop regulation source feedback DC power signal.
15. electric energy conversion system control methods as claimed in claim 9, wherein generate the step bag of this line side control signal
Include：
This second voltage component signal is adjusted by the second outer shroud control loop and follows second voltage command signal；And
Line side feedback power signal is adjusted by the second internal ring control loop and follows line side power instruction signal.
A kind of 16. photovoltaic energy conversion system it is characterised in that：
This photovoltaic energy conversion system includes maximum power tracing circuit, photovoltaic side transducer, load-side transducer, dc bus
With electric energy switching controller；
This maximum power tracing circuit is used for following the trail of the peak power of photo-voltaic power supply module；
This photovoltaic side transducer is connected with this photo-voltaic power supply module, and this photovoltaic side transducer is used for carrying this photo-voltaic power supply module
For electric energy be converted to unidirectional current；
This load-side transducer is connected with this photovoltaic side transducer, and this load-side transducer is used for for this unidirectional current being converted to friendship
Stream electricity；
This dc bus is connected between this photovoltaic side transducer and this load-side transducer；And
This electric energy switching controller is connected and communicates with this photovoltaic side transducer and this load-side transducer, the conversion control of this electric energy
Device processed includes decomposing module, photovoltaic side control module and load-side control module；This decomposing module is used for the representative detecting
The feedback d. c. voltage signal of this DC bus-bar voltage is decomposed into first voltage component signal and second voltage component signal；This light
Volt side control module generates photovoltaic side control signal at least based on this first voltage component signal；This load-side control module is at least
Load-side control signal is generated based on this second voltage component signal.
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|---|---|---|---|---|
| CN101227090A (en) * | 2007-12-03 | 2008-07-23 | 天津理工大学 | Photovoltaic power generation tracking controller based on digital signal processor |
| CN201174592Y (en) * | 2008-03-11 | 2008-12-31 | 天津市海日电子有限公司 | Active filter for power source |
| CN101841160A (en) * | 2009-03-19 | 2010-09-22 | 孔小明 | Grid-connection control method for solar photovoltaic power generation |
| CN102904273A (en) * | 2011-07-29 | 2013-01-30 | 通用电气公司 | Maximum power point tracking (MPPT) control of energy conversion system and relevant method |
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| US8598741B2 (en) * | 2008-12-23 | 2013-12-03 | Samsung Electro-Mechanics Co, Ltd. | Photovoltaic and fuel cell hybrid generation system using single converter and single inverter, and method of controlling the same |
| GB2482653B (en) * | 2010-06-07 | 2012-08-29 | Enecsys Ltd | Solar photovoltaic systems |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101227090A (en) * | 2007-12-03 | 2008-07-23 | 天津理工大学 | Photovoltaic power generation tracking controller based on digital signal processor |
| CN201174592Y (en) * | 2008-03-11 | 2008-12-31 | 天津市海日电子有限公司 | Active filter for power source |
| CN101841160A (en) * | 2009-03-19 | 2010-09-22 | 孔小明 | Grid-connection control method for solar photovoltaic power generation |
| CN102904273A (en) * | 2011-07-29 | 2013-01-30 | 通用电气公司 | Maximum power point tracking (MPPT) control of energy conversion system and relevant method |
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