CN109768570A - A kind of light storage grid-connected system and its control method with APF function - Google Patents
A kind of light storage grid-connected system and its control method with APF function Download PDFInfo
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- CN109768570A CN109768570A CN201811608240.4A CN201811608240A CN109768570A CN 109768570 A CN109768570 A CN 109768570A CN 201811608240 A CN201811608240 A CN 201811608240A CN 109768570 A CN109768570 A CN 109768570A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The present invention provides a kind of, and the light with APF function stores up grid-connected system, including Boost, the output end of the input termination photovoltaic module of Boost, while the output end of Boost is connected to DC bus through dc circuit breaker K1；The input terminal of the photovoltaic combining inverter is connect with DC bus, after output end is connected with AC circuit breaker K3, is connect through ac bus with power grid；The battery and super capacitor mould group connect the input terminal of the bidirectional DC-DC converter, the output end of the bidirectional DC-DC converter is connected to DC bus through dc circuit breaker K2 using going here and there and combining；Described control unit includes DSP control system, detection circuit and driving circuit.The present invention is instructed according to intensity of illumination and dispatching of power netwoks, light storage microgrid can be made to make the best use of everything power grid peak load shifting and harmonics restraint.
Description
Technical field
The invention belongs to distributed generation technology fields, and in particular to a kind of light storage with APF function generates electricity by way of merging two or more grid systems and is
System and its control method.
Background technique
Demand with the whole world to the energy is also corresponding growing, and effect of the new energy in energy resource structure becomes more
To be important, wherein solar energy power generating is received significant attention with unique superiority.However, traditional photovoltaic grid-connected inversion
Device has the problems such as intermittent low with equipment utilization, while non-linear, impact load continues to bring out in power grid, reduces electric energy
Quality, traditional passive filtering can no longer meet.How while improving photovoltaic combining inverter utilization rate, improve electric energy
How on the basis of not increasing hardware costs quality realizes above functions, because of a kind of light storage with APF function of the invention
Grid-connected system has very important significance for generation of electricity by new energy using tool.
Summary of the invention
The object of the present invention is to provide a kind of light storage grid-connected system and control method with APF function, basis
Intensity of illumination and dispatching of power netwoks instruction can make light storage microgrid make the best use of everything power grid peak load shifting and harmonics restraint.
The system of the invention utilizes the general character of photovoltaic combining inverter and active filter in structure and principle, in conjunction with
The energy storage devices such as battery and super capacitor mould group, it is only necessary to modify core algorithm part, so that it may realize photovoltaic DC-to-AC converter peak clipping
Valley-fill and harmonic wave control, achievees the effect that a tractor serves several purposes and save the cost.
In order to achieve the above purpose, the invention provides the following technical scheme:
A kind of light storage grid-connected system with APF function, is made of power cell and control unit two parts；
The power cell includes photovoltaic module, Boost, can work in the photovoltaic combining inverter, two-way of APF state
DC-DC converter, battery and super capacitor mould group；
The output end of the input termination photovoltaic module of the Boost, while the output end of Boost is disconnected through direct current
Road device K1 is connected to DC bus；
The input terminal of the photovoltaic combining inverter is connect with DC bus, after output end is connected with AC circuit breaker K3, warp
Ac bus is connect with power grid；
The battery and super capacitor mould group connect the input terminal of the bidirectional DC-DC converter using going here and there and combining, described
The output end of bidirectional DC-DC converter is connected to DC bus through dc circuit breaker K2；
Described control unit includes DSP control system, detection circuit and driving circuit, and the DSP control system control is all
Component, and control instruction is input to by power cell by driving circuit, the detection circuit is used for actual voltage and current
It is transformed into the range that the AD of DSP control chip can be acquired.
In a preferred embodiment of the invention, the DSP control system further includes AD unit, PWM unit and control
Algorithm unit, variable observed by the AD unit real-time detection, makes comparisons with given value, and departure is passed through control algolithm list
Member, output duty cycle generate driving signal using PWM unit and send to driving circuit.
It in a preferred embodiment of the invention, further include accessory power supply, the accessory power supply uses Switching Power Supply, is responsible for
It powers to entire control unit.
In a preferred embodiment of the invention, the system according to intensity of illumination and whether be low power consumption condition,
Select the operating mode of the photovoltaic combining inverter and two-way DC/DC converter.
In a preferred embodiment of the invention, the photovoltaic combining inverter can both work in photovoltaic inverter grid-connected
State can also work in APF state；The two-way DC/DC converter can both work in Buck mode, can also work
Boost mode.
In a preferred embodiment of the invention, grid-connected in the case that daytime is sunny or sunlight is faint
Inverter works in normal inversion grid connection state；And in the case that sunlight on daytime is faint or evening, photovoltaic grid-connected inversion
Device works in APF (active power filtering) state.
In a preferred embodiment of the invention, in the case that daytime is sunny and non-electrical peak, two-way DC/DC
Converter works in Buck mode；When daytime sunlight it is weaker, it is faint or weaker in the case where, the work of two-way DC/DC converter
In Boost mode.
In a preferred embodiment of the invention, that state, specific deterministic process are entered by intensity of illumination judgement are as follows:
When intensity of illumination be greater than threshold value H, be judged as that daytime is sunny；When intensity of illumination is greater than threshold value L and is less than threshold value H, judgement
It is weaker for sunlight on daytime；When intensity of illumination be less than threshold value L, be judged as daytime sunlight it is faint and at night.
A kind of light storage with APF function is generated electricity by way of merging two or more grid systems control method, comprising the following steps:
When intensity of illumination M is greater than threshold value H, next judges whether it is low power consumption, if it is low power consumption, photovoltaic normal power generation,
Boost carries out MPPT control, and light stores up grid-connected system work in inverter mode, and bidirectional DC-DC converter work exists
Buck state charges to battery and super capacitor mould group；If not be in low power consumption, photovoltaic normal power generation,
Boost carries out MPPT control, and light stores up grid-connected system work in inverter mode, and bidirectional DC-DC converter work exists
Boost state inhibits grid power to fluctuate using energy storage；
When intensity of illumination M is less than threshold value H but is greater than threshold value L, photovoltaic normal power generation, Boost carries out MPPT control, light storage
Grid-connected system work is injected in Boost state, using energy storage to power grid in inverter mode, bidirectional DC-DC converter work
Power；
When intensity of illumination M is less than threshold value L, photovoltaic do not work, and light stores up grid-connected system work in active power filtering state, two-way
DC-DC converter work provides energy to active power filtering in Boost state, using energy storage.
By above technical scheme, the technical effects of the invention are that:
The patent of invention can all can effectively utilize photovoltaic electricity from the angle of power generation.From the angle of function,
Realize that one is multi-purpose, have both parallel network reverse and active power filtering, solve conventional photovoltaic gird-connected inverter only limit power generation on daytime,
The confinement problems of rest are shut down at night.Have simultaneously and fills and leads up low power consumption, grid power fluctuation, extension photovoltaic power generation is inhibited to have
It imitates duration and improves the advantages such as power quality.
Detailed description of the invention
Attached drawing 1 is overall structure block diagram of the invention.
Attached drawing 2 is the control principle drawing of Boost of the invention.
Attached drawing 3 is the maximal power tracing schematic diagram of the invention based on fixed step size disturbance observation method.
Attached drawing 4 is the control principle drawing of photovoltaic combining inverter of the invention.
Attached drawing 5 is bidirectional DC-DC converter and its control principle of the invention.
Attached drawing 6 is control model selection schematic diagram of the invention.
Attached drawing 7 is sun-drenched embodiment 1 on daytime.
Attached drawing 8 is the weaker embodiment 2 of sunlight on daytime.
Attached drawing 9 is the faint implementation 3 with evening of sunlight on daytime.
Specific embodiment
The present invention is described in further details with reference to the accompanying drawing.
Embodiment 1:
The embodiment of the first aspect of the present invention provides a kind of control system, is used for distributed generation technology field, and in particular to
A kind of light storage with APF function is generated electricity by way of merging two or more grid systems control system.Attached drawing 1 is a kind of light with APF function provided by the invention
Store up the structural block diagram of grid-connected system.
As shown in Figure 1, a kind of light with APF function stores up grid-connected system, by power cell and control unit two
It is grouped as；The system is made of power cell and control unit two parts, and specifically power cell includes photovoltaic module
(SUNPOWER 80W 18V), Boost, dc circuit breaker K1 and K2, battery and super capacitor mould group, two-way DC-
DC converter, photovoltaic combining inverter, the AC circuit breaker K3(just Thailand's CJX1 contactor that can be worked in APF state)；
The power cell includes photovoltaic module, Boost, can work in the photovoltaic combining inverter, two-way of APF state
DC-DC converter, battery and super capacitor mould group；The output end of the input termination photovoltaic module of the Boost, together
When Boost output end be connected to DC bus through dc circuit breaker K1；
The input terminal of the photovoltaic combining inverter is connect with DC bus, after output end is connected with AC circuit breaker K3, warp
Ac bus is connect with power grid；
The battery and super capacitor mould group connect the input terminal of the bidirectional DC-DC converter using going here and there and combining, described
The output end of bidirectional DC-DC converter is connected to DC bus through dc circuit breaker K2；
Described control unit includes DSP control system, detection circuit and driving circuit, and the DSP control system control is all
Component, and control instruction is input to by power cell by driving circuit, the detection circuit is used for actual voltage and current
It is transformed into the range that the AD of DSP control chip can be acquired.
The Boost topological structure is as shown in Fig. 2, the output end of input termination photovoltaic module, simultaneously
The output end of Boost is connected to DC bus through dc circuit breaker K1.
Wherein: the electrolytic capacitor C1 of photovoltaic module side chooses 100uF/500V, and inductance L1 chooses 5mH, switching tube IGBT choosing
FGL60N100BNTD, the electrolytic capacitor C2 of DC bus side is taken to choose 24mF/1000V.
By method of perturbation realize MPPT control, the disturbance observation method, first detection photovoltaic array output voltage and
Electric current calculates the output power of photovoltaic array, then by the output voltage of disturbance photovoltaic array, observes photovoltaic array output work
The variation of rate continuously changes disturbance voltage direction according to the trend of changed power, photovoltaic array is made finally to work in maximum power
Point.
It as shown in Fig. 3, is the maximal power tracing schematic diagram based on fixed step size disturbance observation method.Judge photovoltaic array P
(k) illustrate that present operating point on the right side of maximum power point, otherwise illustrates if P (k) is less than P (k-1) with the size of P (k-1)
Present operating point is on the left of maximum power point；The size for judging photovoltaic array output voltage U (k) Yu U (k-1) again, if U (k)
Greater than U (k-1), illustrate increasing disturbance voltage, it should reduce given la tension de reference Uref est, otherwise illustrate reducing disturbance electricity
Pressure, it should be carried out along perturbation direction；Maximum power point is found with this perturbation scheme.
The photovoltaic combining inverter topological structure with APF function is as shown in Fig. 4, the light with APF function
The input terminal of volt gird-connected inverter is connect with DC bus, after output end is connected with AC circuit breaker K3, through ac bus and
Power grid connection.
Wherein three phase inverter bridge IPM uses PM50CLA120, ac filter inductance Ls to choose 3mH, and control strategy is using straight
Flow the conventional double-loop control strategy of busbar voltage outer shroud, inductive current inner ring.
The bidirectional DC-DC converter topological structure is as shown in Fig. 5, and use is non-isolated, Current Reversible Chopper.
Wherein low-pressure side electrolytic capacitor C3 chooses 1000uF/450V, and inductance L2 chooses 2.35mH.Choose power outer ring, current inner loop
Double-loop control strategy can inhibit grid power to fluctuate；The control strategy for choosing DC voltage outer ring, current inner loop, can be with
A stable voltage source is provided to DC bus.
The battery and super capacitor mould group are using going here and there and combining, and voltage reaches 300V, as bidirectional DC-DC converter
The input terminal of device, simultaneously bi-directionally the output end of DC-DC converter is connected to DC bus through dc circuit breaker K2.
Wherein control unit is made of DSP28335 control system (DSP28335), detection circuit and driving circuit, DSP control
Maincenter of the system processed as entire control system is responsible for PWM output, AD detection, software protection and under working environment not of the same race
Control algolithm switching.
Wherein DSP control system is made of PWM unit, AD unit, control algolithm unit and protection location；(four hard
It is parallel running on part, but is again series operation in program execution.DSP circuit is equivalent to people in entire control process
Brain, control all components and organ operation.Variable observed by AD unit real-time detection by DSP control system, with
Given value is made comparisons, and departure is passed through control algolithm unit, output duty cycle generates driving signal using PWM unit, in turn
Entire control system is driven, system is maintained to operate normally.And protection location is to prevent overcurrent, over-voltage or the entire control of excess temperature damage
System processed.
The detection circuit uses DC voltage Hall sensor (VSM025A), DC current Hall sensor
(HDC-10SY), AC voltage transformer (DL-PT202H1), alternating current Hall sensor (HX-10-P) and amplifier conditioning
Circuit is responsible for the range that can acquire actual Voltage to current transducer to the AD of DSP control chip；
The driving circuit is using isolation DC-DC module and A3120 driving chip composition, for driving metal-oxide-semiconductor and IGBT just
Normal open is disconnected；
The accessory power supply uses Switching Power Supply, is responsible for powering to entire control unit.
Photovoltaic combining inverter with APF function can both work in photovoltaic inverter grid-connected state, can also work
In APF (active power filtering) state.Specifically in the case that daytime is sunny or sunlight is faint, photovoltaic combining inverter work
Make in normal inversion grid connection state；And in the case that sunlight on daytime is faint or evening, photovoltaic combining inverter work exists
APF (active power filtering) state.
Simultaneously bi-directionally DC/DC converter can both work in Buck mode, can also work in Boost mode；Specifically
In the case that daytime is sunny and non-electrical peak, two-way DC/DC converter work is in Buck mode；When daytime sunlight compared with
In the case where weak, faint or weaker, two-way DC/DC converter work is in Boost mode.
Above by intensity of illumination judgement enter that state, specific deterministic process are as follows: when intensity of illumination be greater than threshold value H,
It is judged as that daytime is sunny；When intensity of illumination is greater than threshold value L and is less than threshold value H, it is judged as that daytime sunlight is weaker；Work as illumination
Intensity be less than threshold value L, be judged as daytime sunlight it is faint and at night.
On daytime, sunny (sunny and weaker daytime is judged by control unit, and intensity of illumination can be passed through
Judged, measures real-time lighting intensity using GZD system illuminance sensor, filled according to illuminance parameter decision sunlight on daytime
Foot and weaker two kinds of situations.According to illuminance parameter, system automatically selects operating mode, into corresponding working condition.) feelings
Under condition, photovoltaic module realizes maximal power tracing output by prime Boost, provides preceding step voltage for DC bus
Source, the photovoltaic combining inverter with APF function work in photovoltaic inverter grid-connected state, to power grid input power.Root at this time
According to the operating status of power grid, the working condition of bidirectional DC-DC converter is selected.When being in peak of power consumption, in bidirectional DC-DC converter
Under the action of device, energy storage device works in Boost pressure constant state, provides power to power grid together with photovoltaic module, reaches peak clipping
Valley-fill effect；
When being in low power consumption (peak of power consumption is determined according to dispatching of power netwoks instruction), bidirectional DC-DC converter
Work carries out charging energy-storing in Buck state, to battery and super capacitor mould group；It is two-way when being in non-electrical low ebb
DC-DC converter work inhibits grid power to fluctuate in Boost state, using energy storage.
In the case where daytime, sunlight was weaker, photovoltaic module realizes that maximal power tracing is defeated by prime Boost
Out, simultaneously bi-directionally the work of DC/DC converter is in Boost constant voltage mode, and the energy of battery and super capacitor mould group is by two-way
DC/DC converter maintains DC bus-bar voltage constant, and the photovoltaic combining inverter with APF function works in photovoltaic DC-to-AC converter
Grid connection state, photovoltaic module and energy storage device provide power to power grid jointly, extend the grid-connected effective operating time of photovoltaic inversion.
In the case where sunlight on daytime faint and evening, photovoltaic module stops working, energy storage device using accumulation energy,
Make bidirectional DC-DC converter work in Boost pressure constant state, the photovoltaic combining inverter with APF function works in active filter
Wavy state compensates the harmonic wave in power grid, improves power quality.
The above-mentioned Algorithms Integration application problem about gird-connected inverter and active filter
Firstly, found by the principle Analysis to gird-connected inverter and parallel connection type active electric filter, both
Topological structure it is closely similar.Its core is all the control to three-phase bridge type converter, is all control three-phase inverter output electricity
Stream tracks given constant current.It is only different to constant current for distinguishing, and photovoltaic combining inverter is with network voltage to constant current
The three-phase current signal of frequency (working in unity power factor) identical as phase.
And Three-Phase Parallel Active Power Filter-APF is then to detect as caused by nonlinear load to constant current
Harmonic current signal.The core of photovoltaic combining inverter with APF function is control PWM rectifier, makes its output to be expected
Given value, to realize grid-connected and active power filtering function.
Secondly, the core algorithm of parallel connection type APF mainly has: Harmonic currents detection, DC voltage outer loop control, exchange side
The three parts such as current inner loop control.Wherein DC voltage outer loop control, ac-side current inner loop control are both for its system
The control of core, that is, PWM rectifier part and the shared control algolithm of two kinds of functions, be both suitble to the spy of gird-connected inverter
Point, while also reaching the requirement of APF.
Therefore, it realizes the dual-use function with the light storage grid-connected system of APF function, is calculated in hardware and software
Method is with uniformity, and difference is only in the difference for giving constant current.Need additional Harmonic currents detection module, in real time to harmonic current into
Row uses, and only comes into operation in active power filtering state.
Embodiment 2:
The embodiment of the second aspect of the invention patent also provides the controlling party with the light storage grid-connected system of APF function
Method.
As shown in Fig. 6, according to intensity of illumination and whether be low power consumption condition, select have APF function light store up
The control model of grid-connected system.
When intensity of illumination M is greater than threshold value H, next judges whether it is low power consumption, and if it is low power consumption, photovoltaic is normally sent out
Electricity, Boost carry out MPPT control, and light stores up grid-connected system work in inverter mode, bidirectional DC-DC converter work
In Buck state, charge to battery and super capacitor mould group；If not be in low power consumption, photovoltaic normal power generation,
Boost carries out MPPT control, and light stores up grid-connected system work in inverter mode, and bidirectional DC-DC converter work exists
Boost state inhibits grid power to fluctuate using energy storage.
When intensity of illumination M is less than threshold value H but is greater than threshold value L, photovoltaic normal power generation, Boost carries out MPPT control,
Light stores up grid-connected system work in inverter mode, and bidirectional DC-DC converter works in Boost state, using energy storage to power grid
Injecting power.
When intensity of illumination M is less than threshold value L, photovoltaic do not work, and light stores up grid-connected system work in active power filtering state, double
To DC-DC converter work in Boost state, energy is provided to active power filtering using energy storage.
Embodiment 1 is in the case where daytime is sunny, and as shown in Fig. 7, dc circuit breaker K1 is closed, direct current interruption
Device K2 closure, photovoltaic module PV realize that maximal power tracing exports using climbing method by prime Boost, are that direct current is female
Line provide prime voltage source, at this time with APF function photovoltaic combining inverter work voltage-controlled photovoltaic DC-to-AC converter simultaneously
Net state keeps inverter output voltage and frequency consistent with power grid.Software phlase locking is carried out to network voltage simultaneously, works as Phase synchronization
When, AC circuit breaker K3 closure, photovoltaic combining inverter seamlessly switches to the state of current control from voltage control, defeated to power grid
Enter power.At this time according to the operating status of power grid, the working condition of bidirectional DC-DC converter is selected.When in low power consumption
When, bidirectional DC-DC converter work is in Buck state, and remaining photovoltaic module energy is by bidirectional DC-DC converter to storage
Battery and super capacitor mould group carry out charging energy-storing；When low ebb non-in electricity consumption, bidirectional DC-DC converter work exists
Boost state inhibits grid power to fluctuate using battery group and super capacitor group, can achieve valley-fill and inhibition grid power
The effect of fluctuation.
Embodiment 2 is in the case where daytime, sunlight was weaker, and as shown in Fig. 8, dc circuit breaker K1 and K2 are closed, light
It lies prostrate component and maximal power tracing output is realized by prime Boost, simultaneously bi-directionally the work of DC/DC converter is in Boost
The energy of constant voltage mode, battery and super capacitor mould group maintains DC bus-bar voltage constant by two-way DC/DC converter,
Photovoltaic combining inverter work with APF function is in photovoltaic inverter grid-connected state, AC circuit breaker K3 closure, photovoltaic module
Power is provided to power grid jointly with energy storage device, extends the effective operating time of photovoltaic combining inverter.
Embodiment 3 is in the case where sunlight on daytime faint and evening, and as shown in Fig. 9, dc circuit breaker K1 is disconnected, directly
Flow breaker K2 cooperation, photovoltaic module stops working, bidirectional DC-DC converter work in Boost pressure constant state, battery group and
Super capacitor group maintains DC voltage by bi-directional DC-DC using the energy of accumulation, and AC circuit breaker K3 closure has APF
The photovoltaic combining inverter of function works in active power filtering state, and real-time detection goes out the harmonic and reactive currents of power grid, and by its
As the instruction current of active power filtering after reversed polarity, the current on line side of APF is connected in parallel to by current control, to compensate in power grid
Harmonic wave and reactive power make power network current sine wave, improve power quality.
The patent of invention can all can effectively utilize photovoltaic electricity from the angle of power generation.From the angle of function
Degree realizes that one is multi-purpose, has both parallel network reverse and active power filtering, solves conventional photovoltaic gird-connected inverter and only limits hair on daytime
Electricity, the confinement problems for shutting down rest at night.Have simultaneously and fills and leads up low power consumption, inhibit grid power fluctuation, extend photovoltaic hair
The advantages such as electric effective time and improvement power quality.
The above content is combining specific preferred embodiment to be further described to made by patent of invention, cannot recognize
The specific implementation for determining the invention patent is only limited to these instructions.For the ordinary skill people of the invention patent technical field
For member, under the premise of not departing from the invention patent design, a number of simple deductions or replacements can also be made, all should be considered as
Belong to the scope of protection of the patent of the present invention.
Claims (9)
1. a kind of light with APF function stores up grid-connected system, it is made of power cell and control unit two parts；
The power cell includes photovoltaic module, Boost, can work in the photovoltaic combining inverter, two-way of APF state
DC-DC converter, battery and super capacitor mould group；
The output end of the input termination photovoltaic module of the Boost, while the output end of Boost is disconnected through direct current
Road device K1 is connected to DC bus；
The input terminal of the photovoltaic combining inverter is connect with DC bus, after output end is connected with AC circuit breaker K3, warp
Ac bus is connect with power grid；
The battery and super capacitor mould group connect the input terminal of the bidirectional DC-DC converter using going here and there and combining, described
The output end of bidirectional DC-DC converter is connected to DC bus through dc circuit breaker K2；
Described control unit includes DSP control system, detection circuit and driving circuit, and the DSP control system control is all
Component, and control instruction is input to by power cell by driving circuit, the detection circuit is used for actual voltage and current
It is transformed into the range that the AD of DSP control chip can be acquired.
2. a kind of light with APF function according to claim 1 stores up grid-connected system, which is characterized in that the DSP
Control system further includes AD unit, PWM unit and control algolithm unit, variable observed by the AD unit real-time detection,
It makes comparisons with given value, departure is passed through into control algolithm unit, output duty cycle generates driving signal using PWM unit and send
To driving circuit.
3. a kind of light with APF function according to claim 1 stores up grid-connected system, which is characterized in that further include
Accessory power supply, the accessory power supply use Switching Power Supply, are responsible for powering to entire control unit.
4. a kind of light storage grid-connected system with APF function described in one of -3 according to claim 1, which is characterized in that
The system according to intensity of illumination and whether be low power consumption condition, select the photovoltaic combining inverter and two-way DC/DC
The operating mode of converter.
5. a kind of light with APF function according to claim 4 stores up grid-connected system, which is characterized in that the light
Volt gird-connected inverter can both work in photovoltaic inverter grid-connected state, can also work in APF state；The two-way DC/DC
Converter can both work in Buck mode, can also work in Boost mode.
6. a kind of light with APF function according to claim 4 stores up grid-connected system, which is characterized in that work as daytime
Sunny or in the case that sunlight is faint, photovoltaic combining inverter works in normal inversion grid connection state；And work as daytime
In the case that sunlight is faint or evening, photovoltaic combining inverter works in APF (active power filtering) state.
7. a kind of light with APF function according to claim 6 stores up grid-connected system, which is characterized in that work as daytime
In the case where sunny and non-electrical peak, two-way DC/DC converter work is in Buck mode；When daytime sunlight it is weaker, micro-
In the case where weak or weaker, two-way DC/DC converter work is in Boost mode.
8. a kind of light with APF function according to claim 7 stores up grid-connected system, which is characterized in that pass through light
According to intensity judgement enter that state, specific deterministic process are as follows: when intensity of illumination be greater than threshold value H, be judged as that daytime is sunny；
When intensity of illumination is greater than threshold value L and is less than threshold value H, it is judged as that daytime sunlight is weaker；When intensity of illumination is less than threshold value L, judgement
For sunlight on daytime it is faint and at night.
The control method 9. a kind of light storage with APF function is generated electricity by way of merging two or more grid systems, which comprises the following steps:
When intensity of illumination M is greater than threshold value H, next judges whether it is low power consumption, if it is low power consumption, photovoltaic normal power generation,
Boost carries out MPPT control, and light stores up grid-connected system work in inverter mode, and bidirectional DC-DC converter work exists
Buck state charges to battery and super capacitor mould group；If not be in low power consumption, photovoltaic normal power generation,
Boost carries out MPPT control, and light stores up grid-connected system work in inverter mode, and bidirectional DC-DC converter work exists
Boost state inhibits grid power to fluctuate using energy storage；
When intensity of illumination M is less than threshold value H but is greater than threshold value L, photovoltaic normal power generation, Boost carries out MPPT control, light storage
Grid-connected system work is injected in Boost state, using energy storage to power grid in inverter mode, bidirectional DC-DC converter work
Power；
When intensity of illumination M is less than threshold value L, photovoltaic do not work, and light stores up grid-connected system work in active power filtering state, two-way
DC-DC converter work provides energy to active power filtering in Boost state, using energy storage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811608240.4A CN109768570A (en) | 2018-12-27 | 2018-12-27 | A kind of light storage grid-connected system and its control method with APF function |
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| CN110456590A (en) * | 2019-07-29 | 2019-11-15 | 努比亚技术有限公司 | Method of supplying power to, flash lamp, mobile terminal and computer readable storage medium |
| CN110571842A (en) * | 2019-07-23 | 2019-12-13 | 许继集团有限公司 | New energy station electric energy quality regulation and control method, device and system |
| CN112217475A (en) * | 2020-09-29 | 2021-01-12 | 合肥阳光新能源科技有限公司 | IV curve scanning method and optical storage system |
| CN112653347A (en) * | 2020-12-16 | 2021-04-13 | 国网江苏省电力有限公司经济技术研究院 | Power router topology based on direct current integration mode and control method thereof |
| CN113555874A (en) * | 2020-04-23 | 2021-10-26 | 株洲中车时代电气股份有限公司 | Electric energy quality management system for micro-grid |
| CN114204515A (en) * | 2021-12-14 | 2022-03-18 | 阳光电源股份有限公司 | Control method of electromagnetic switch and electrical system |
| CN114243751A (en) * | 2021-11-09 | 2022-03-25 | 长春吉电能源科技有限公司 | Power electronics light storage fusion grid-connected system |
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| CN114243751A (en) * | 2021-11-09 | 2022-03-25 | 长春吉电能源科技有限公司 | Power electronics light storage fusion grid-connected system |
| CN114204515A (en) * | 2021-12-14 | 2022-03-18 | 阳光电源股份有限公司 | Control method of electromagnetic switch and electrical system |
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