CN104079194A - Electric energy conversion system and method - Google Patents
Electric energy conversion system and method Download PDFInfo
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- CN104079194A CN104079194A CN201310109147.XA CN201310109147A CN104079194A CN 104079194 A CN104079194 A CN 104079194A CN 201310109147 A CN201310109147 A CN 201310109147A CN 104079194 A CN104079194 A CN 104079194A
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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
Abstract
The invention discloses an electric energy conversion system which comprises a source side converter, a wire side converter and an electric energy conversion controller. The source side converter is used for converting electric energy supplied by a power source module into direct currents. The wire side converter is used for converting the direct currents into alternating currents. The electric energy conversion controller is in connection and communication with the source side converter and the wire side converter. The electric energy conversion controller comprises a decomposition module, a source side control module and a wire side control module. The decomposition module is used for decomposing feedback DC voltage signals into first voltage component signals and second voltage component signals. The invention further discloses an electric energy conversion system control method. According to the electric energy conversion system and the electric energy conversion system control method, the method that the source side converter and the wire side converter are controlled simultaneously is used for optimizing output response of DC bus voltages.
Description
Technical field
Execution mode disclosed by the invention relates to electric energy conversion system and method, to be used for controlling DC bus-bar voltage.
Background technology
Along with to for example growth of solar energy demand of new forms of energy, the photovoltaic system based on photovoltaic effect is more and more used to solar energy to be converted to electric energy.Photovoltaic system is general adopts a plurality of electronic power switch devices to realize power conversion.Conventionally, solar panel is connected to the source of photovoltaic system as input power, and for solar energy is converted to electric energy, then this photovoltaic system can be converted to this electric energy the required electric energy of line lateral load.Electrical network is widely used as the load of photovoltaic system, for electric energy required in life is provided.Typical photovoltaic system comprises DC bus, and this DC bus is connected between source and line side, and it is one of key technology of electric energy transfer process that the DC bus-bar voltage at DC bus two ends is controlled.
Therefore, be necessary to provide a kind of improved system and method to solve above-mentioned technical problem.
Summary 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, and this electric energy conversion system comprises source transducer, line side transducer, DC bus and electric energy switching controller.This source transducer is converted to direct current for the electric energy that power supply module is provided.This line side transducer is connected with this source transducer, and this line side transducer is for being converted to alternating current by this direct current.This DC bus is connected between this source transducer and this line side transducer.And this electric energy switching controller is connected with this line side transducer with this source transducer and communication, this electric energy switching controller comprises decomposing module, source control module and line side control module.This decomposing module is for being decomposed into the first component of voltage signal and second voltage component signal by the feedback d. c. voltage signal that represents this DC bus both end voltage detecting.This source control module at least generates based on this first component of voltage signal the source control signal that offers this source transducer.This line side control module at least generates based on this second voltage component signal the line side control signal that offers this line side transducer.
Electric energy conversion system as above, this electric energy conversion system also comprises maximum power tracing circuit, the maximum power of this maximum power tracing circuit for following the trail of this power supply module.
Electric energy conversion system as above, wherein this decomposing module comprises high pass filter and low pass filter.This high pass filter is for this feedback d. c. voltage signal is decomposed into high frequency voltage component signal, and this low pass filter is for being decomposed into low-frequency voltage component signal by this feedback d. c. voltage signal.This high frequency voltage component signal is as this first component of voltage signal, and this low-frequency voltage component signal is as this second voltage component signal.
Electric energy conversion system as above, wherein this source control module comprises the first outer shroud control loop, and this first outer shroud control loop is used for controlling this first component of voltage signal and follows the first voltage command signal, and this first voltage command signal is zero command signal.
Electric energy conversion system as above, wherein this source control module comprises the first interior ring control loop, this first interior ring control loop is used for controlling source feedback DC current signal and follows source current command signal.
Electric energy conversion system as above, wherein this source control module comprises the first interior ring control loop, this first interior ring control loop is used for controlling source feedback d. c. voltage signal and follows source voltage command signal.
Electric energy conversion system as above, wherein this source control module comprises the first interior ring control loop, this first interior ring control loop is used for controlling source feedback DC power signal and follows source power instruction signal.
Electric energy conversion system as above, wherein this line side control module comprises the second outer shroud control loop and the second interior ring control loop, this the second outer shroud control loop is used for controlling this second voltage component signal and follows second voltage command signal, this second interior ring control loop is used for controlling this line side feedback power signal and follows line side power instruction signal, and this second voltage command signal is constant command signal.
Another aspect of the present invention is to provide a kind of electric energy conversion system control method, and the method comprises the steps: to measure DC bus both end voltage and obtains feeding back d. c. voltage signal.By decomposing module, this feedback d. c. voltage signal is decomposed into the first component of voltage signal and second voltage component signal.By source control module, at least based on this first component of voltage signal, generate source control signal, for controlling source transducer.And at least based on this second voltage component signal, generate line side control signal by line side control module, for control line side transducer.
Electric energy conversion system control method as above, wherein this decomposition step comprises by high pass filter this 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 as this first component of voltage signal, and this low-frequency voltage signal is as this second voltage component signal.
Electric energy conversion system control method as above, the step that wherein generates this source control signal comprises by the first outer shroud control loop and regulates this first component of voltage signal to follow the first voltage command signal.
Electric energy conversion system control method as above, the step that wherein generates this source control signal comprises that by the first interior ring control loop, regulating source to feed back DC current signal follows source current command signal.
Electric energy conversion system control method as above, the step that wherein generates this source control signal comprises that by the first interior ring control loop, regulating source to feed back d. c. voltage signal follows source direct voltage command signal.
Electric energy conversion system control method as above, the step that wherein generates this source control signal comprises that by the first interior ring control loop, regulating source to feed back DC power signal follows source direct current power command signal.
Electric energy conversion system control method as above, the step that wherein generates this line side control signal comprises: by the second outer shroud control loop, regulate this second voltage component signal to follow second voltage command signal.And regulate line side feedback power signal to follow line side power instruction signal by the second interior ring control loop.
Another aspect of the present invention is to provide a kind of photovoltaic energy converting system.This photovoltaic energy converting system comprises maximum power tracing circuit, photovoltaic side transducer, load-side transducer, DC bus and electric energy switching controller.The maximum power of this maximum power tracing circuit for following the trail 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 converted to direct current for the electric energy that this photo-voltaic power supply module is provided.This load-side transducer is connected with this photovoltaic side transducer, and this load-side transducer is for being converted to alternating current by this direct current.This DC bus is connected between this photovoltaic side transducer and this load-side transducer.And this electric energy switching controller and this photovoltaic side transducer are connected with load-side transducer and communication, this electric energy switching controller comprises decomposing module, photovoltaic side control module and load-side control module.This decomposing module is for being decomposed into the first component of voltage signal and second voltage component signal by the feedback d. c. voltage signal that represents this DC bus-bar voltage detecting.This photovoltaic side control module at least generates photovoltaic side control signal based on this first component of voltage signal.And this load-side control module at least generates load-side control signal based on this second voltage component signal.
Electric energy conversion system provided by the invention and electric energy conversion system control method are compared with traditional method, the control of source transducer and the control of line side transducer are combined, HFS in DC bus-bar voltage is controlled by source transducer, and the low frequency part in DC bus-bar voltage is controlled by line side transducer.The method of this Collaborative Control source transducer and line side transducer can guarantee that DC bus-bar voltage has fast, responds accurately, stably output.
Accompanying drawing explanation
For embodiments of the present invention, be described in conjunction with the drawings, the present invention may be better understood, in the accompanying drawings:
Figure 1 shows that the module map of a kind of execution mode of electric energy conversion system.
Figure 2 shows that voltage-to-current (voltage-current characteristic) the characteristic curve schematic diagram of photovoltaic cell.
Figure 3 shows that a kind of execution mode schematic diagram of decomposing module in electric energy conversion system as shown in Figure 1.
Figure 4 shows that a kind of control block diagram of source control module in electric energy conversion system as shown in Figure 1.
Figure 5 shows that the another kind of control block diagram of source control module in electric energy conversion system as shown in Figure 1.
Figure 6 shows that the another kind of control block diagram of source control module in electric energy conversion system as shown in Figure 1.
Figure 7 shows that a kind of control block diagram of electric energy conversion system center line side control module as shown in Figure 1.
The DC bus-bar voltage response curve schematic diagram that while Figure 8 shows that power supply module output voltage generation disturbance as shown in Figure 1, three kinds of different control methods is put on to electric energy conversion system as shown in Figure 1 and produce.
Figure 9 shows that the method flow diagram of control electric energy conversion system as shown in Figure 1.And
Figure 10 shows that the sub-step flow chart of a kind of execution mode of illustrating decomposition step as shown in Figure 9.
Embodiment
One or more embodiment of the present invention below will be described.First it is to be noted, in the specific descriptions process of these execution modes, in order to carry out brief and concise description, this specification can not all be done detailed description to all features of actual execution mode.Should be understandable that; in the actual implementation process of any one execution mode; in the process in any one engineering project or design object; in order to realize developer's objectives; or in order to meet system restriction relevant or that business is relevant; usually can make various concrete decision-makings, and this also can change to another kind of execution mode from a kind of execution mode.In addition, it will also be appreciated that, although the effort of having done in this development process may be complicated and tediously long, yet for those of ordinary skill in the art relevant to content disclosed by the invention, some designs of carrying out on the basis of the technology contents disclosing in the disclosure, the changes such as manufacture or production are conventional technological means, not should be understood to content disclosed by the invention insufficient.
Unless otherwise defined, the technical term using in the present specification and claims or scientific terminology should be has the ordinary meaning that the personage of general technical ability understands in the technical field of the invention." first " of using in this specification and claims or " second " and similarly word do not represent any order, quantity or importance, and are just used for distinguishing different parts.The similar words such as " one " or " one " do not represent restricted number, and mean and have at least one."or" comprise in cited project any one or all." connection " or " being connected " etc. similarly word be not defined in connection physics or machinery, but can comprise electrical connection, no matter be directly or indirectly.In addition, " circuit " and " control module " etc. can comprise single component or by a plurality of active members or passive device directly or connected set indirectly, one or more integrated circuit (IC) chip for example, the function of correspondence description to provide.
The words such as " can ", " can " who uses in the present invention and " possibility " show the possibility of event generation in some environment.Have a kind of particular community, feature or function.And/or by representing one or more abilities, performance or possibility with a certain qualified verb conjugations.Responsively, the use of " possibility " shows: adorned term for shown in ability, function or purposes be obviously suitably, can mate or suitable.Consider the existence in some situation, adorned term sometimes may be inappropriate simultaneously, do not mate or improper.For example, in some cases, can there is a certain result or performance by expectability.And in other cases, this result or performance may not occur.This difference is embodied by the word that represents " possibility ".
Figure 1 shows that the module map of a kind of execution mode of the electric energy conversion system that the present invention discloses.As shown in Figure 1, this electric energy conversion system 10 comprises source transducer 14, line side transducer 16, DC bus 15 and electric energy switching controller 18.In execution mode as shown in Figure 1, this DC bus 15 is connected between this source transducer 14 and this line side transducer 16.This electric energy switching controller 18 and this source transducer 14, this line side transducer 16 is connected with this DC bus 15 and communication.This electric energy switching controller 18 is for controlling this source transducer 14 and this line side transducer 16 to maintain the direct voltage (V at these DC bus 15 two ends
dc) in a particular value or particular range.
As shown in Figure 1, this source transducer 14 is connected with power supply module 12, for the first electric energy that this power supply module 12 is produced, is converted to the second electric energy on this DC bus 15.This source transducer 14 can comprise that a plurality of switching devices (scheming not shown) are as mos field effect transistor (MOSFETs) and/or insulated gate bipolar transistor (IGBTs).
In some embodiments, this power supply module 12 is DC power supply modules, and this source transducer 14 comprises dc/dc power transducer, is converted to second electric energy at these DC bus 15 two ends for this first electric energy that this power supply module 12 is produced.In some embodiments, this dc/dc power transducer comprises booster circuit, and reduction voltage circuit or other anyly can be converted to a kind of direct current energy the circuit of another kind of direct current energy.In a kind of execution mode more specifically, this power supply module 12 comprises that sun-generated electric power module is if solar panel or battery modules are as fuel cell.
In some embodiments, this power supply module 12 is AC power modules, and this source transducer 14 comprises AC/DC power transducer, is converted to the direct current energy at these DC bus 15 two ends for the AC energy that this power supply module 12 is produced.In some embodiments, this AC/DC power transducer comprises H bridge transducer, and three-phase commutation bridge or other anyly can be converted to AC energy the circuit of direct current energy.In a kind of execution mode more specifically, this power supply module 12 comprises 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, for direct current energy is converted to AC energy, then offers this AC energy for example electrical network of this load 17().This line side transducer 16 can comprise that a plurality of switching devices (scheming not shown) are as mos field effect transistor (MOSFETs) and/or insulated gate bipolar transistor (IGBTs).In some embodiments, this line side transducer 16 comprises H bridge transducer, and three-phase inverter or other anyly can be converted to direct current energy the circuit of AC energy.
In execution mode as shown in Figure 1, this power supply module 12 comprises that photo-voltaic power supply module is as at least one group of solar panel.Illumination, the factors such as temperature and impedance can cause solar panel to have non-linear output characteristic, and this non-linear output characteristic can represent with voltage-to-current curve 65 as shown in Figure 2.This voltage-to-current curve 65 shows the non-linear output characteristic of solar panel under particular light condition.Dash area 66 represents the power output of this power supply module 12.V
openrepresent the open circuit voltage when output current I is zero.I
shortrepresent the short circuit current when output voltage is zero.P
mpp, V
mpp, and I
mppthe power that represents respectively maximum power point, voltage and current.
As shown in Figure 1, this electric energy conversion system 10 can comprise low pass filter 13, and this low pass filter 13 is connected between this power supply module 12 and this source transducer 14.This low pass filter 13 for the high fdrequency component of these power supply module 12 generating electric energies of filtering with DC power output.Then this direct current energy can be provided for this source transducer 14.This low pass filter 13 can comprise one or more electric capacity and/or inductance.
In execution mode as shown in Figure 1, this electric energy conversion system 10 can comprise maximum power tracing circuit 20, and this maximum power tracing circuit 20 is for following the tracks of maximum power point to guarantee this power supply module 12 exportable maximum power under any given environmental condition.In execution mode as above, one or more transducers for example current sensor and voltage sensor for measuring the electrical quantity relevant to this electric energy conversion system 10.These one or more transducers exportable this maximum power tracing circuit 20 and the discernible signal of this electric energy switching controller 18.In some embodiments, transducer comprises resistance, hall effect sensor and Fibre Optical Sensor.
In some embodiments, current sensor 56 feeds back DC current signal (I for measuring electric current the output current signal of these power supply module 12 generations as source
dc_source_fbk) 57.Voltage sensor 58 feeds back d. c. voltage signal (V for measuring voltage the output voltage signal of these power supply module 12 generations as source
dc_source_fbk) 59.This maximum power tracing circuit 20 is at least according to this source feedback DC current signal I
dc_source_fbk57 feed back d. c. voltage signal V with this source
dc_source_fbk59 obtain maximum power point reference signal 30.This maximum power point reference signal 30 can comprise maximum power point power 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 that this power supply module 12 is at the given or reference power of maximum power point work Maximum Power Output point, voltage and current.
A kind of direct current bus voltage control method is for maintaining the direct voltage V at these DC bus 15 two ends
dcin a particular value or particular range.The control signal providing according to this electric energy switching controller 18 comes this source transducer 14 of Collaborative Control and this line side transducer 16 to obtain the DC bus-bar voltage of expectation.In some embodiments, this electric energy switching controller 18 can comprise any suitable programmable circuit or device, comprise digital signal processor (Digital Signal Processor, DSP), field programmable gate array (Field Programmable Gate Array, FPGA), programmable logic controller (PLC) (Programmable Logic Controller, PLC) and application-specific integrated circuit (ASIC) (Application Specific Integrated Circuit, ASIC) etc.This electric energy switching controller 18 can hardware, the form of software or software and hardware combining is implemented.
Consider restriction power providing capability and the limited bandwidth of line side as limited in source on hardware, the DC bus-bar voltage at these DC bus 15 two ends is controlled by this source transducer 14 of Collaborative Control and this line side transducer 16 and is realized.More specifically, this electric energy switching controller 18 comprises decomposing module 24, source control module 22 and line side control module 26.
In execution mode as shown in Figure 1, the first voltage sensor 60 is for detection of the direct voltage V of these DC bus 15 both sides
dcand output feedback d. c. voltage signal (V
dc_fbk) 40.One or more second voltage transducers 62 are used to detect this electrical network 17, this line side transducer 16, or between electrical network 17 and line side transducer 16, at least one phase voltage in the three-phase voltage of any point output voltage signal 46 are given this electric energy switching controller 18.Voltage magnitude signal V
amp(scheming not shown) can calculate based on this voltage signal 46 in this electric energy switching controller 18.
This decomposing module 24 receives this feedback d. c. voltage signal V
dc_fbk40 and generate the first component of voltage signal 32 and second voltage component signal 34.This source control module 22 receives these the first component of voltage signals 32, to voltage command signal 42 and this maximum power point reference signal 30(P for example
* mpp, V
* mppand I
* mpp) and generate source control signal 50 to offer this source transducer 14.This line side control module 26 receives this second voltage component signal 34, and second voltage command signal 44 and this voltage signal 46 also generate line side control signal 52 to offer this line side transducer 16.Method by this source transducer 14 of Collaborative Control and this line side transducer 16 can make this DC bus-bar voltage obtain fast, respond accurately, stably output.
In some embodiments, this decomposing module 24 is for feeding back d. c. voltage signal V by this
dc_fbk40 are decomposed into two components, and these two components can be two DC component, DC component and an alternating current component or two alternating current components.In other embodiments, this feedback d. c. voltage signal V
dc_fbk40 can be broken down into more than two components.
Execution mode as shown in Figure 3, feeds back d. c. voltage signal V via high pass filter 74 by this
dc_fbk40 are decomposed into the first component of voltage signal 32, via low pass filter 76, this are fed back to d. c. voltage signal V
dc_fbk40 are decomposed into second voltage component signal 34.This first component of voltage signal 32 is as feedback signal V
dc_h_fbkbe provided for this source control module 22.This second voltage component signal 34 is used as feedback signal V
dc_l_fbkoffer this line side control module 26.Wherein, V
dc_h_fbkrepresent this first component of voltage signal 32, V
dc_l_fbkrepresent this second voltage component signal 34.V
dc_h_fbk32 and V
dc_l_fbkthen 34 be supplied to this source control module 22 and this line side control module 26.
In some embodiments, the form of software that this high pass filter 74 and this low pass filter 76 can be programmed in this electric energy switching controller 18 realizes.In other embodiments, this high pass filter 74 and this low pass filter 76 can adopt the example, in hardware of electronic device to realize.
When electric energy conversion system shown in Fig. 1 is photovoltaic energy converting system, this power supply module 12 is photo-voltaic power supply module, this source transducer 14 is photovoltaic side transducer, this line side transducer 16 is load-side transducer, this source control module 22 in this electric energy switching controller 18 is photovoltaic side control module, this line side control module 26 is load-side control module, and this source control signal 50 is photovoltaic side control signal, and this line side control signal 52 is load-side control signal.
Next by this control signal (source control signal 50 and line side control signal 52), the generative process in this electric energy switching controller 18 is described in detail.
Figure 4 shows that a kind of control block diagram of source control module in electric energy conversion system as shown in Figure 1.This source control module 22 is for controlling this first component of voltage signal V
dc_h_fbk32 follow this first voltage command signal 42.In some embodiments, this first voltage command signal 42 is high frequency voltage command signal (V
dc_h_cmd).In execution mode as shown in Figure 4, this first voltage command signal 42 is zero command signal, i.e. DC bus-bar voltage V
dcin high fdrequency component amplitude control to as far as possible little.Controller chassis Figure 100 of this source control module 22 comprises the first outer shroud control loop 133 and the first interior ring control loop 131.
At this first outer shroud control loop 133(or voltage control loop) in, this source control module 22 receives this first voltage command signal V
dc_h_cmd42 and this first component of voltage signal V
dc_h_fbk32.By summator 103 by V
dc_h_cmd42 and V
dc_h_fbk32 do poor first voltage error signal 106 that obtains.Then this first voltage error signal 106 is admitted to outer shroud voltage regulator 105 and for output, offers the first current reference signal Δ I of this first interior ring control loop 131
dc_source108.
This first interior ring control loop 131(or current regulator) be used to control source feedback DC current signal I
dc_source_fbk57 follow source current command signal I
dc_source_cmd114.By summator 113 by this first current reference signal Δ I
dc_source108 and this maximum power point current reference signal I
* mpp112 summations obtain this source current command signal I
dc_source_cmd114.Then by summator 117 by this source current command signal I
dc_source_cmd114 feed back DC current signal I with this source
dc_source_fbk57 do poor first current error signal 118 that obtains.
As shown in Figure 4, current regulator 107 receives the rear output voltage signal 120 of this first current error signal 118 to modulator-demodulator 109.In some embodiments, for example, by the carrier signal of this voltage signal 120 and fixed frequency or frequency conversion (triangular wave or sawtooth signal) is compared and obtains this source control signal PWM
source50.This source control signal PWM
sourcethen 50 be provided for this source transducer 14 for turning on and off a plurality of switching devices in this source transducer 14.
Figure 5 shows that the another kind of control block diagram of source control module in electric energy conversion system as shown in Figure 1.Similar with the controller chassis Figure 100 shown in Fig. 4, the controller chassis Figure 200 shown in Fig. 5 is used for controlling this first component of voltage signal V
dc_h_fbk32 follow the first voltage command signal V
dc_h_cmd42.This first voltage command signal V
dc_h_cmdthe 42nd, zero command signal.The first outer shroud control loop 233 is voltage control loops.Therefore, for the specific descriptions of this first outer shroud control loop 233, at this, omit.
Yet, Fig. 4 and Fig. 5 respectively shown in the difference of control block diagram be this first interior ring control loop 231.Fig. 5 illustrated embodiment comprises that another voltage control loop is as this first interior ring control loop 231.In execution mode as shown in Figure 5, this first voltage error signal 106 is admitted to outer shroud voltage regulator 105 and for output, offers the first voltage reference signal Δ V of this first interior ring control loop 231
dc_source208.
As shown in Figure 5, this first interior ring control loop 231(or voltage control loop) be used to control this source feedback direct voltage V
dc_source_fbk59 follow this source voltage command signal V
dc_source_cmd214.By summator 213 by this first voltage reference signal Δ V
dc_source208 and this maximum power point voltage reference signal V
* mpp212 summations obtain this source voltage command signal V
dc_source_cmd214.Then by summator 217 by this source voltage command signal V
dc_source_cmd214 feed back direct voltage V with this source
dc_source_fbk59 do the poor first interior loop voltag error signal 218 that obtains.
Interior loop voltag adjuster 207 receives the rear output voltage signal 220 of this first interior loop voltag error signal 218 to modulator-demodulator 209.In some embodiments, for example, by the carrier signal of this voltage signal 220 and fixed frequency or frequency conversion (triangular wave or sawtooth signal) is compared and obtains this source control signal PWM
source50.This source control signal PWM
sourcethen 50 be provided for this source transducer 14 for turning on and off a plurality of switching devices in this source transducer 14.
Figure 6 shows that the another kind of control block diagram of source control module in electric energy conversion system as shown in Figure 1.Similar with the controller chassis Figure 100 shown in Fig. 4, the control block diagram 300 shown in Fig. 6 is for controlling this first component of voltage signal V
dc_h_fbk32 follow the first voltage command signal V
dc_h_cmd42.This first voltage command signal V
dc_h_cmdthe 42nd, zero command signal.The first outer shroud control loop 333 is voltage control loops.Therefore, for the specific descriptions of this first outer shroud control loop 333, at this, omit.
Yet, Fig. 4 and Fig. 6 respectively shown in the difference of control block diagram be this first interior ring control loop 331.Execution mode shown in Fig. 6 comprises that a power control loop is as this first interior ring control loop 331.In execution mode as shown in Figure 6, this first voltage error signal 106 is admitted to outer shroud voltage regulator 105 and for output, offers the first power reference signal Δ P of this first interior ring control loop 331
dc_source308.
As shown in Figure 6, this first interior ring control loop 331(or power control loop) be used to control this source feedback power signal P
dc_source_fbk316 follow this source power instruction signal P
dc_source_cmd314.By summator 313 by this first power reference signal Δ P
dc_source308 and this maximum power point power reference signal P
* mpp312 summations obtain this source power instruction signal P
dc_source_cmd314.Then by summator 317 by this source power instruction signal P
dc_source_cmd314 and this source feedback power signal P
dc_source_fbk316 do poor first power error signal 318 that obtains.
The first power governor 307 receives the rear output voltage signal 320 of this first power error signal 318 to modulator-demodulator 309.In some embodiments, for example, by the carrier signal of this voltage signal 320 and fixed frequency or frequency conversion (triangular wave or sawtooth signal) is compared and obtains this source control signal PWM
source50.This source control signal PWM
sourcethen 50 be provided for this source transducer 14 for turning on and off a plurality of switching devices in this source transducer 14.
Figure 7 shows that a kind of control block diagram of electric energy conversion system center line side control module as shown in Figure 1.This control block diagram 400 is for controlling this second voltage component signal V
dc_l_fbk34 follow this second voltage command signal 44.In some embodiments, this second voltage command signal 44 is low-frequency voltage command signal (V
dc_l_cmd).In execution mode as shown in Figure 7, this second voltage command signal 44 is constant command signals, i.e. DC bus-bar voltage V
dcin low frequency component amplitude be controlled in constant value.The control block diagram 400 of this line side control module 26 comprises the second outer shroud control loop 433 and the second interior ring control loop 431.
In execution mode as shown in Figure 7, at this second outer shroud control loop 433(or voltage control loop) in, this line side control module 26 receives this second voltage command signal V
dc_l_cmd44 and this second voltage component signal V
dc_l_fbk34.By summator 403 by this second voltage command signal V
dc_l_cmd44 and this second voltage component signal V
dc_l_fbk34 do the poor second voltage error signal 406 that obtains.Then this second voltage error signal 406 is admitted to voltage regulator 405 and for output, offers the first power reference signal Δ P of this second interior ring control loop 431
dc_line408.
As shown in Figure 7, this second interior ring control loop 431(or power control loop) be used to control line side power feedback signal P
dc_line_fbk416 follow line side power instruction signal P
dc_line_cmd414.As shown in Figure 7 in execution mode, this line side power feedback signal P
dc_line_fbk416 at least calculate according to the voltage signal 46 of this electrical network 17.By summator 413 by this first power reference signal Δ P
dc_line408 and this maximum power point power reference signal P
* mpp112 summations obtain this line side power instruction signal P
dc_line_cmd414.Then by summator 417 by this line side power instruction signal P
dc_line_cmd414 and this line side power feedback signal P
dc_line_fbk416 do poor first current error signal 418 that obtains.
The second power governor 407 receives the rear output frequency error signal of this first current error signal 418 (ω
c) to integrator 410.In some embodiments, this integrator 410 can comprise phase angle signal higher limit and lower limit.This integrator 410 is according to this frequency error signal ω
coutput phase angle signal θ
c.In some embodiments, this integrator 410 can also be provided with phase angle signal higher limit and phase angle signal lower limit, or the clipping element that passes through to arrange is in addition to output phase angle signal θ
camplitude limit.If θ
cthe phase angle signal higher limit that surpasses this integrator 410, this integrator 410 will be exported this phase angle signal higher limit.If θ
cthe phase angle signal lower limit that surpasses this integrator 410, this integrator 410 will be exported this phase angle signal lower limit.If θ
cbetween the phase angle signal higher limit and lower limit of this integrator 410, this integrator 413 will be exported this phase angle signal θ
c.In execution mode as shown in Figure 7, this modulator-demodulator 409 receives this phase angle signal θ
cwith this voltage magnitude signal V
amp420 and output line side control signal PWM
line52 give this line side transducer 16 for turning on and off a plurality of switching devices in this line side transducer 16.
In above-described execution mode, this outer shroud voltage regulator 105, this current regulator 107, this interior loop voltag adjuster 207, this first power governor 307, this voltage regulator 405 and this second power governor 407 can passing ratio control algolithms, proportional plus integral control algorithm or other intelligent control algorithm forms realize.
While Figure 8 shows that the power supply module output voltage generation disturbance shown in Fig. 1, three kinds of different control methods put on the DC bus-bar voltage response curve of electric energy conversion system as shown in Figure 1.As shown in Figure 8, the first curve 702 carries out for DC bus DC bus 15 both end voltage of controlling as shown in Figure 1 the curve chart that existing the first control method produces, and this control method realizes DC bus-bar voltage by this source transducer 14 of independent control and controls.
The second curve 704 carries out for DC bus DC bus 15 both end voltage of controlling as shown in Figure 1 the curve chart that existing the second control method produces, and this control method realizes DC bus-bar voltage by this line side transducer 16 of independent control and controls.
The curve chart that the third control method that the 3rd curve 706 proposes for the DC bus DC bus 15 both end voltage two execution the present invention that control as shown in Figure 1 produces, this control method realizes DC bus-bar voltage by this source transducer 14 of Collaborative Control and this line side transducer 16 and controls.
V
dc_cmdrepresent this V
dc_h_cmdand V
dc_l_cmdstack.At moment t
0, there is 5% disturbance in the output voltage of this power supply module 12, under three kinds of distinct methods are controlled, and this DC bus-bar voltage V
dcthere is oscillatory response in various degree.
More specifically, as shown in Figure 8, after disturbance occurs, be t the recovery time of this first curve 702
1, be t the recovery time of this second curve 704
2, be t the recovery time of the 3rd curve 706
3, wherein, t
1>t
2>t
3.Result shows that the third control method that the present invention proposes can allow this DC bus-bar voltage V fast
dcrecover steadily.Under three kinds of different control methods, be respectively V with 702,704 and 706 corresponding voltage oscillation value sizes
dc_source-V
dc_cmd, V
dc_cmd-V
dc_lineand V
dc_cmd-V
dc_sourceline.Wherein, V
dc_source-V
dc_cmd>V
dc_cmd-V
dc_line>V
dc_cmd-V
dc_sourceline.Compare with 704 with curve 702, when there is disturbance, 706 adopt the method for this source transducer 14 of Collaborative Control and this line side transducer 16 can obtain shorter recovery time and less oscillation amplitude.
Figure 9 shows that and control the method flow diagram of electric energy conversion system as shown in Figure 1.As shown in Figure 9, in step 801, voltage sensor is for detection of voltage the output feedback d. c. voltage signal V at these DC bus 15 two ends
dc_fbk40.
In step 803, decomposing module 24 is for feeding back d. c. voltage signal V by this
dc_fbk40 are decomposed into the first component of voltage signal 32 and second voltage component signal 34.A specific embodiment of this decomposition step 803 as shown in figure 10.
In execution mode as shown in figure 10, this decomposition step 803 can comprise sub-step 901 and 903.In sub-step 901, high pass filter 74 is for feeding back d. c. voltage signal V by this
dc_fbk40 resolve into a high frequency voltage component V
dc_h_fbkas this first component of voltage signal 32.In sub-step 903, low pass filter 76 is for feeding back d. c. voltage signal V by this
dc_fbk40 resolve into a low-frequency voltage component V
dc_h_fbkas this second voltage component signal 34.
As shown in Figure 9, in step 805, source control module 22 at least generates source control signal 50 based on this first component of voltage signal 32, for controlling source transducer 14.In step 807, line side control module 26 at least generates line side control signal 52 based on this second voltage component signal 34, for control line side transducer 16.
Although describe the present invention in conjunction with specific execution mode, those skilled in the art will appreciate that and can make many modifications and modification to the present invention.Therefore, recognize, the intention of claims is to be encompassed in all such modifications and the modification in true spirit of the present invention and scope.
Claims (16)
1. an electric energy conversion system, is characterized in that:
This electric energy conversion system comprises source transducer, line side transducer, DC bus and electric energy switching controller;
This source transducer is converted to direct current for the electric energy that power supply module is provided;
This line side transducer is connected with this source transducer, and this line side transducer is for being converted to alternating current by this direct current;
This DC bus is connected between this source transducer and this line side transducer; And
This electric energy switching controller is connected with this line side transducer with this source transducer and communication, and this electric energy switching controller comprises decomposing module, source control module and line side control module; This decomposing module is for being decomposed into the first component of voltage signal and second voltage component signal by the feedback d. c. voltage signal that represents this DC bus both end voltage detecting; This source control module at least generates based on this first component of voltage signal the source control signal that offers this source transducer; This line side control module at least generates based on this second voltage component signal the line side control signal that offers this line side transducer.
2. electric energy conversion system as claimed in claim 1, wherein this electric energy conversion system also comprises maximum power tracing circuit, the maximum power of this maximum power tracing circuit for following the trail of this power supply module.
3. electric energy conversion system as claimed in claim 1, wherein this decomposing module comprises high pass filter and low pass filter; This high pass filter is for this feedback d. c. voltage signal is decomposed into high frequency voltage component signal, and this low pass filter is for being decomposed into low-frequency voltage component signal by this feedback d. c. voltage signal; This high frequency voltage component signal is as this first component of voltage signal, and this low-frequency voltage component signal is as this second voltage component signal.
4. electric energy conversion system as claimed in claim 1, wherein this source control module comprises the first outer shroud control loop, this the first outer shroud control loop is used for controlling this first component of voltage signal and follows the first voltage command signal, and this first voltage command signal is zero command signal.
5. electric energy conversion system as claimed in claim 4, wherein this source control module comprises the first interior ring control loop, this first interior ring control loop is used for controlling source feedback DC current signal and follows source current command signal.
6. electric energy conversion system as claimed in claim 4, wherein this source control module comprises the first interior ring control loop, this first interior ring control loop is used for controlling source feedback d. c. voltage signal and follows source voltage command signal.
7. electric energy conversion system as claimed in claim 4, wherein this source control module comprises the first interior ring control loop, this first interior ring control loop is used for controlling source feedback DC power signal and follows source power instruction signal.
8. electric energy conversion system as claimed in claim 1, wherein this line side control module comprises the second outer shroud control loop and the second interior ring control loop, this the second outer shroud control loop is used for controlling this second voltage component signal and follows second voltage command signal, this second interior ring control loop is used for controlling this line side feedback power signal and follows line side power instruction signal, and this second voltage command signal is constant command signal.
9. an electric energy conversion system control method, is characterized in that, the method comprises the steps:
Measure DC bus both end voltage and obtain feeding back d. c. voltage signal;
By decomposing module, this feedback d. c. voltage signal is decomposed into the first component of voltage signal and second voltage component signal;
By source control module, at least based on this first component of voltage signal, generate source control signal, for controlling source transducer; And
By line side control module, at least based on this second voltage component signal, generate line side control signal, for control line side transducer.
10. electric energy conversion system control method as claimed in claim 9, wherein this decomposition step comprises:
By high pass filter, this feedback d. c. voltage signal is decomposed into high-frequency voltage signal, this high-frequency voltage signal is as this first component of voltage signal;
By low pass filter, this feedback d. c. voltage signal is decomposed into low-frequency voltage signal, this low-frequency voltage signal is as this second voltage component signal.
11. electric energy conversion system control methods as claimed in claim 9, the step that wherein generates this source control signal comprises by the first outer shroud control loop and regulates this first component of voltage signal to follow the first voltage command signal.
12. electric energy conversion system control methods as claimed in claim 11, the step that wherein generates this source control signal comprises that by the first interior ring control loop, regulating source to feed back DC current signal follows source current command signal.
13. electric energy conversion system control methods as claimed in claim 11, the step that wherein generates this source control signal comprises that by the first interior ring control loop, regulating source to feed back d. c. voltage signal follows source direct voltage command signal.
14. electric energy conversion system control methods as claimed in claim 11, the step that wherein generates this source control signal comprises that by the first interior ring control loop, regulating source to feed back DC power signal follows source direct current power command signal.
15. electric energy conversion system control methods as claimed in claim 9, the step that wherein generates this line side control signal comprises:
By the second outer shroud control loop, regulate this second voltage component signal to follow second voltage command signal; And
By the second interior ring control loop, regulate line side feedback power signal to follow line side power instruction signal.
16. 1 kinds of photovoltaic energy converting systems, is characterized in that:
This photovoltaic energy converting system comprises maximum power tracing circuit, photovoltaic side transducer, load-side transducer, DC bus and electric energy switching controller;
The maximum power of this maximum power tracing circuit for following the trail 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 converted to direct current for the electric energy that this photo-voltaic power supply module is provided;
This load-side transducer is connected with this photovoltaic side transducer, and this load-side transducer is for being converted to alternating current by this direct current;
This DC bus is connected between this photovoltaic side transducer and this load-side transducer; And
This electric energy switching controller is connected with this load-side transducer with this photovoltaic side transducer and communication, and this electric energy switching controller comprises decomposing module, photovoltaic side control module and load-side control module; This decomposing module is for being decomposed into the first component of voltage signal and second voltage component signal by the feedback d. c. voltage signal that represents this DC bus-bar voltage detecting; This photovoltaic side control module at least generates photovoltaic side control signal based on this first component of voltage signal; This load-side control module at least generates load-side control signal based on this second voltage component signal.
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