CN104393834A - Module serial structure based photovoltaic power station - Google Patents
Module serial structure based photovoltaic power station Download PDFInfo
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- CN104393834A CN104393834A CN201410708503.4A CN201410708503A CN104393834A CN 104393834 A CN104393834 A CN 104393834A CN 201410708503 A CN201410708503 A CN 201410708503A CN 104393834 A CN104393834 A CN 104393834A
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- 238000004146 energy storage Methods 0.000 claims abstract description 39
- 239000003990 capacitor Substances 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 2
- 238000003491 array Methods 0.000 abstract 2
- 230000007547 defect Effects 0.000 abstract 1
- 238000007599 discharging Methods 0.000 abstract 1
- 238000010248 power generation Methods 0.000 abstract 1
- 238000005286 illumination Methods 0.000 description 25
- 238000004088 simulation Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
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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
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Photovoltaic Devices (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention aims at solving defects of the prior art and provides a module serial structure based photovoltaic power station. By means of the serial structure based photovoltaic power station, effects of constant fluctuation of the direct-current voltage on equipment operations are reduced, and the whole photovoltaic power station stability is improved. The photovoltaic power station comprises a plurality of photovoltaic modules which are connected in series on a controller. Compared with the prior art, DC/DC choppers in all photovoltaic modules output appropriate terminal voltages to connected photovoltaic arrays based on the stable direct-current energy-storage capacitor voltage, so that all photovoltaic arrays can work at the larges power point independently, and the photovoltaic power generation efficiency is improved apparently; according to the half H bridge converters which are connected in series, a sorting based capacitor voltage balance strategy is used, discharging and charging balance of the direct-current energy-storage capacitors connected with the half H bridge converters is adjusted, and accordingly, the voltages of the direct-current energy-storage capacitors of the photovoltaic modules are stable.
Description
Technical field
The present invention relates to a kind of voltage source converter station, particularly a kind of photovoltaic plant based on block coupled in series structure.
Background technology
Luminous energy, as a kind of clean energy resource, is more and more taken seriously now.But because the output voltage of single photovoltaic cell and electric current are very limited, carry out grid-connected after therefore often direct for the photovoltaic cell of some connection in series-parallel being formed photovoltaic array as shown in Figure 1 in prior art.The practical way that scale develops photovoltaic energy like this.The MPPT maximum power point tracking of photovoltaic cell is by regulating the direct voltage at photovoltaic cell two ends to realize.The direct series-parallel synchronizing mode of photovoltaic cell regulates the direct voltage at whole photovoltaic array two ends, realizes the MPPT maximum power point tracking of whole photovoltaic array.But, due to the direct voltage at uncontrollable each photovoltaic cell two ends, also just MPPT maximum power point tracking cannot be carried out to each photovoltaic cell.The intensity of illumination of each photovoltaic cell, temperature and Fabrication parameter etc. can not be completely the same, so the generating capacity of each photovoltaic cell is discrepant.Particularly when photovoltaic array is under local shades illumination condition, each generating capacity of photovoltaic cell widely different.Along with the direct increase of connection in series-parallel photovoltaic cell quantity and the expansion of generating capacity of photovoltaic cell difference, the efficiency of the direct connection in series-parallel synchronizing mode of photovoltaic cell will significantly decline thereupon.
For solving this problem, low profile photovoltaic array (by a small amount of photovoltaic cell connection in series-parallel) and DC/DC chopper can be used to form photovoltaic module, grid-connected again after being connected by photovoltaic module, its structure as shown in Figure 2.Use DC/DC chopper to regulate the direct voltage at low profile photovoltaic array two ends, each photovoltaic array can be made to be operated in maximum power point.The output current of each tandem photovoltaic module is equal, and their power output is discrepant.Therefore, the net side direct voltage of each DC/DC chopper is different, and direct voltage will change in time.The continuous fluctuation of direct voltage will run equipment and cause adverse effect.
Summary of the invention
The object of the invention is to the shortcoming solving prior art existence, provide a kind of novel photovoltaic plant based on block coupled in series structure, the continuous fluctuation reducing direct voltage runs the impact caused on equipment, improve the stability of whole photovoltaic plant.
In order to reach described object, a kind of photovoltaic plant based on block coupled in series structure of the present invention, comprise the photovoltaic module of connection multiple mutual series connection on the controller, each described photovoltaic module comprises photovoltaic array one by one, this photovoltaic array is in parallel with an electrochemical capacitor, the right side of the positive pole of electrochemical capacitor is connected to the collector electrode of an IGBT, the emitter of this IGBT is connected to the negative pole of the first diode, the positive pole of the first diode is connected with the negative pole of electrochemical capacitor, the positive pole of the first diode is connected with an inductance, IGBT described like this, first diode and inductance constitute a Buck type DC/DC chopper, the right side of described Buck chopper is connected to half H bridge converter by a DC energy storage electric capacity.
Preferably, this photovoltaic array described is composed in parallel by the dry photovoltaic cell string of even number.
Preferably, half described H bridge converter is made up of two power switch pipes and two diodes; Wherein, the collector electrode of upper brachium pontis power switch pipe is connected with the positive output end of half H bridge converter storage capacitor, the emitter of upper brachium pontis power switch pipe is connected with the collector electrode of lower brachium pontis power switch pipe and is the first output of half H bridge converter, the emitter of lower brachium pontis power switch pipe is connected with the negative output terminal of half H bridge converter and is the second output of half H bridge converter, and the gate pole of two power switch pipes receives the drive singal of a pair complementation that controller provides respectively.Preferably, described photovoltaic module quantity is n,
Wherein Ud1 is the rated value of the total output dc voltage of cascaded structure, and UC is the rated value of the DC energy storage capacitance voltage be connected on half H bridge converter.Can make full use of each photovoltaic module like this.
Further, the present invention adopts following control method, comprising:
(1) voltage of the DC energy storage electric capacity of Real-time Collection half and half H bridge converter;
(2) for next control cycle, the voltage of the DC energy storage electric capacity of half and half H bridge converter is sorted from high to low;
(3) the half H bridge converter of n before the arrangement of DC energy storage capacitance voltage is placed in input state, the upper brachium pontis power switch pipe by these half H bridge converters is all open-minded, and lower brachium pontis power switch pipe is all closed; All the other half H bridge converters are placed in excision state, and the upper brachium pontis power switch pipe by these half H bridge converters is all closed, and lower brachium pontis power switch pipe is all open-minded; N be greater than 0 natural number.
The present invention compared with prior art, DC/DC chopper in each photovoltaic module exports suitable terminal voltage based on stable DC energy storage capacitance voltage to connected photovoltaic array, make each photovoltaic array can both be operated in maximum power point independently, significantly promote photovoltaic efficiency; Each series connection half H bridge converter uses the capacitor voltage balance strategy based on sequence, regulates the electric discharge of the connected DC energy storage electric capacity of each half H bridge converter to balance with charging, makes the voltage of the DC energy storage electric capacity of each photovoltaic module keep stable.
Accompanying drawing explanation
Fig. 1 is photovoltaic cell connection in series-parallel synchronizing mode;
Fig. 2 is photovoltaic module series connection synchronizing mode;
Fig. 3 is single photovoltaic figure;
Fig. 4 is photovoltaic parallel in system structure;
Fig. 5 is operating mode Traffic simulation oscillogram always;
Fig. 6 is operating mode one of ac and photovoltaic module power output simulation waveform figure;
Fig. 7 is operating mode two DC quantity simulation waveform figure;
Fig. 8 is operating mode two of ac and photovoltaic module power output simulation waveform figure.
Embodiment
As shown in Figure 3, be a specific embodiment of the present invention.For the above-mentioned technical disadvantages existing for prior art, the invention provides a kind of photovoltaic plant based on cascaded structure and control method thereof, can, under various working, the direct voltage of each photovoltaic module be remained unchanged.
Based on a photovoltaic plant for cascaded structure, comprising: multiple photovoltaic module and a controller; Described photovoltaic module be connected with DC ?DC converter, described DC ?the DC output side of DC converter be parallel with DC energy storage electric capacity 5 and half H bridge converter 6; The outlet side of the multiple stage half H bridge converter 6 that multiple photovoltaic module is corresponding is respectively connected successively; As shown in Figure 3, the leftmost side of this module is a photovoltaic array to the structure of described single photovoltaic module, and the short circuit current of this photovoltaic array is 800.5A, and open circuit voltage is 4.53kV, is made up of the connection in series-parallel of some photovoltaic cells 1.In parallel with the electrochemical capacitor 2 of 10000 microfarads on the right side of this photovoltaic array, this electrochemical capacitor 2 for when electric current is interrupted, for photovoltaic array provides current path.The right side of the positive pole of electrochemical capacitor 2 is connected to the collector electrode of an IGBT3, and the emitter of this IGBT3 is connected to the negative pole of the first diode 4, and the positive pole of this diode is connected with the negative pole of electrochemical capacitor 2.The positive pole of this diode is connected with the inductance 7 of 0.01 henry.Above-mentioned IGBT3, diode and inductance 7 constitutes a Buck type DC/DC chopper.The electric capacity on the right side of Buck chopper is the DC energy storage electric capacity 5 of half H bridge converter 6, and the capacitance of DC energy storage electric capacity 5 is 8000 microfarads, and its rated direct voltage is 2kV, represents with UC.Buck chopper regulates the terminal voltage of photovoltaic array according to the output characteristic of photovoltaic array, thus realizes the MPPT maximum power point tracking of photovoltaic array.Half described H bridge converter 6 is made up of two power switch pipes and two diodes; Wherein, the collector electrode of upper brachium pontis power switch pipe is connected with the positive output end of half H bridge converter 6 storage capacitor, the emitter of upper brachium pontis power switch pipe is connected with the collector electrode of lower brachium pontis power switch pipe and is the first output of half H bridge converter 6, the emitter of lower brachium pontis power switch pipe is connected with the negative output terminal of half H bridge converter 6 and is the second output of half H bridge converter 6, and the gate pole of two power switch pipes receives the drive singal of a pair complementation that controller provides respectively.The control method of above-mentioned photovoltaic plant, comprises the steps:
(1) voltage of the DC energy storage electric capacity 5 of Real-time Collection half and half H bridge converter 6;
(2) for next control cycle, the voltage of the DC energy storage electric capacity 5 of half and half H bridge converter 6 is sorted from high to low;
(3) the half H bridge converter 6 of n before DC energy storage electric capacity 5 voltage alignment is placed in input state, the upper brachium pontis power switch pipe by these half H bridge converters 6 is all open-minded, and lower brachium pontis power switch pipe is all closed; All the other half H bridge converters 6 are placed in excision state, and the upper brachium pontis power switch pipe by these half H bridge converters 6 is all closed, and lower brachium pontis power switch pipe is all open-minded; N be greater than 0 natural number.
Each photovoltaic module in photovoltaic plant of the present invention adopts and is connected in series, and whether the electric discharge of the DC energy storage electric capacity 5 of half H bridge converter 6 is controlled by half H bridge converter 6.The voltage of the DC energy storage electric capacity 5 of half and half H bridge converter 6 is gathered and sorted.According to capacitance voltage order from high to low, select the DC energy storage electric capacity 5 of some, the half H bridge converter 6 be connected with these DC energy storage electric capacity 5 is placed in input state, and all the other half H bridge converters 6 are placed in excision state.The DC energy storage electric capacity 5 in parallel with the half H bridge converter 6 being in input state is discharged, the DC energy storage electric capacity 5 in parallel with the half H bridge converter 6 being in excision state is not discharged.
The output of half and half H bridge converter 6 is directly connected by the present invention, the direct current energy that the head and end output voltage of cascaded structure is higher, be connected with a total inverter by direct current cables by the head and end of cascaded structure, direct current energy inversion is AC energy and sends into public electric wire net by total inverter.Total inverter uses conventional constant DC voltage control, stablizes the voltage of the head and end of cascaded structure.
The beneficial effect that the present invention compared with prior art has is: the DC/DC chopper in each photovoltaic module exports suitable terminal voltage based on stable DC energy storage electric capacity 5 voltage to connected photovoltaic array, make each photovoltaic array can both be operated in maximum power point independently, significantly promote photovoltaic efficiency; Each series connection half H bridge converter 6 uses the capacitor voltage balance strategy based on sequence, regulates the electric discharge of the connected DC energy storage electric capacity 5 of each half H bridge converter 6 to balance with charging, makes the voltage of the DC energy storage electric capacity 5 of each photovoltaic module keep stable.
Switching control method corresponding to present embodiment middle controller, as follows:
First, the DC capacitor voltage of Real-time Collection half and half H bridge converter;
Then, for next control cycle, the DC capacitor voltage of half and half H bridge converter is sorted from high to low;
Finally, make the upper brachium pontis IGBT of half H bridge converter of DC capacitor voltage arrangement front 10 all open-minded, lower brachium pontis IGBT all closes; The upper brachium pontis IGBT of all the other 8 half H bridge converters is all closed, and lower brachium pontis IGBT is all open-minded.
Half H bridge converter of each photovoltaic module in photovoltaic plant adopts and is connected in series; The direct current energy that photovoltaic array sends is to DC energy storage capacitor charging, and whether DC energy storage capacitor discharge is by half H bridge converter control.The voltage of controller to the DC energy storage electric capacity of each AC ?DC converter is measured and sorts, and according to DC energy storage capacitance voltage order from high to low, selects the DC energy storage electric capacity of some.The half H bridge converter corresponding with these storage capacitors is placed in input state, and on it, brachium pontis IGBT is open-minded, when lower brachium pontis IGBT turns off, and the voltage of the DC energy storage electric capacity that half H bridge inverter output voltage connects for it, and this DC energy storage capacitor discharge; All the other half H bridge converters are placed in excision state, and on it, brachium pontis IGBT turns off, and when lower brachium pontis IGBT opens, half H bridge inverter output voltage is zero, and the DC energy storage electric capacity of its correspondence does not discharge.The output of all photovoltaic modules is directly connected by present embodiment, the head and end of cascaded structure exports the direct current energy of high voltage, be connected with a total inverter by direct current cables by the head and end of cascaded structure, direct current energy inversion is AC energy and sends into public electric wire net by total inverter.Total inverter uses conventional constant DC voltage control, stablizes the voltage of the head and end of cascaded structure.
Dc-link capacitance is in parallel with half H bridge converter, and whether dc-link capacitance discharges by half H bridge converter control.When the upper brachium pontis IGBT in half H bridge converter is open-minded, when lower brachium pontis IGBT turns off, the voltage of the dc-link capacitance that half H bridge inverter output voltage connects for it, and the electric discharge of this dc-link capacitance.When the upper brachium pontis IGBT in half H bridge converter turns off, when lower brachium pontis IGBT opens, half H bridge inverter output voltage is zero, and the dc-link capacitance of its correspondence does not discharge.
In order to make result more clear, 18 photovoltaic modules are equally divided into three groups, first, second, and third group comprises the 1 to 6, the 7 to 12, the 13 to 18 photovoltaic module respectively, and the intensity of illumination of the photovoltaic module in same group is consistent.For real system, the illumination condition of most of photovoltaic module that infield is close is also basically identical.
(1) operating mode one
Operating mode one simulated light overhead utility enters the situation of shade illumination condition from normal lighting conditions.Under normal condition, the intensity of illumination of photovoltaic plant is 1000W/m2.After 2.5s, photovoltaic plant enters shade illumination condition, and the intensity of illumination of the 3rd group of photovoltaic module (the 13rd ?18 photovoltaic modules) reduces to 300W/m2, and the intensity of illumination of all the other modules is constant.After 2.8s, photovoltaic plant returns to normal illumination condition.Fig. 5 sets forth the oscillogram of total direct voltage, direct current, active power, and the oscillogram of the DC capacitor voltage of each photovoltaic module.Fig. 6 (a) and (b) sets forth the alternating voltage of grid-connected inverters point (PCC) and the oscillogram of alternating current.Fig. 6 (c) gives the power output of each group of first photovoltaic module, and often in group, the power output of all the other photovoltaic modules is also substantially identical.
After photovoltaic plant enters shade illumination condition, the MPPT maximum power point tracking control action of the 3rd group of photovoltaic module, this group photovoltaic module is adjusted to the maximum power point under low-light condition, the power output of this group photovoltaic module significantly declines.The illumination condition of first group and second group photovoltaic module is constant, and its power output remains unchanged substantially.The power output of whole photovoltaic plant is only slightly decline, and the DC capacitor voltage of each photovoltaic module remains unchanged substantially.Therefore, under the grid-connected scheme that the present invention proposes, after part photovoltaic module enters shade illumination condition, can not affect the normal work of all the other photovoltaic modules, the photovoltaic module under different illumination conditions can be operated in respective maximum power point.
(2) operating mode two
The remarkable unbalanced situation of illumination condition of each photovoltaic module in operating mode two simulated light overhead utility.Under normal condition, the intensity of illumination of photovoltaic plant is 1000W/m2.After 2.5s, photovoltaic plant enters uneven illumination condition, the intensity of illumination of first group of photovoltaic module (the 1st ?6 photovoltaic modules) reduces to 900W/m2, the intensity of illumination of second group of photovoltaic module (the 7th ?12 photovoltaic modules) reduces to 600W/m2, and the intensity of illumination of the 3rd group of photovoltaic module (the 13rd ?18 photovoltaic modules) reduces to 300W/m2.After 2.8s, photovoltaic plant recovers normal lighting conditions.Fig. 7 sets forth the oscillogram of total direct voltage, direct current, active power, and the oscillogram of the DC capacitor voltage of each photovoltaic module.Fig. 8 (a) and (b) sets forth the alternating voltage of grid-connected inverters point (PCC) and the oscillogram of alternating current.Fig. 8 (c) gives the power output of each group of first photovoltaic module, and often in group, the power output of all the other photovoltaic modules is also substantially identical.
After photovoltaic plant enters uneven illumination condition, the MPPT maximum power point tracking control action of three groups of photovoltaic modules, is adjusted to the maximum power point under corresponding illumination condition by each group of photovoltaic module.Intensity of illumination declines more, and the power output of this group photovoltaic module declines also more.The power output of whole photovoltaic plant significantly declines, but the DC capacitor voltage of each photovoltaic module remains unchanged substantially.Operating mode one is consistent with the intensity of illumination of group photovoltaic cell of the 3rd under operating mode two, and corresponding Fig. 6 (c) is also basically identical with the power output of the 3rd group of photovoltaic module in Fig. 8 (c).Therefore, the power output of photovoltaic module is only determined by himself operating mode, not by the impact of other photovoltaic modules.Under the grid-connected scheme that the present invention proposes, after photovoltaic plant enters serious uneven illumination condition, each photovoltaic module can carry out MPPT maximum power point tracking independently, realizes generating efficiency and maximizes.
The present invention is only described in detail with regard to most preferred embodiment of the present invention; but the restriction to other modes of the invention process can not be interpreted as; everyly further improve and similar or identical scheme on basis of the present invention, being all considered as is the scope that request of the present invention is protected.
Claims (5)
1. the photovoltaic plant based on block coupled in series structure, comprise the photovoltaic module of connection multiple mutual series connection on the controller, it is characterized in that, each described photovoltaic module comprises a photovoltaic array, this photovoltaic array is in parallel with an electrochemical capacitor (2), the right side of the positive pole of electrochemical capacitor (2) is connected to the collector electrode of an IGBT (3), the emitter of this IGBT (3) is connected to the negative pole of the first diode (4), the positive pole of the first diode (4) is connected with the negative pole of electrochemical capacitor (2), the positive pole of the first diode (4) is connected with an inductance (7), IGBT (3) described like this, first diode (4) and inductance (7) constitute a Buck type DC/DC chopper, the right side of described Buck chopper is connected to half H bridge converter (6) by a DC energy storage electric capacity (5).
2. a kind of photovoltaic plant based on block coupled in series structure as claimed in claim 1, is characterized in that: this photovoltaic array described is made up of the dry photovoltaic cell of even number (1) connection in series-parallel.
3. a kind of photovoltaic plant based on block coupled in series structure as claimed in claim 1, is characterized in that: half described H bridge converter (6) is made up of two power switch pipes and two diodes; Wherein, the collector electrode of upper brachium pontis power switch pipe is connected with the positive output end of half H bridge converter (6) storage capacitor, the emitter of upper brachium pontis power switch pipe is connected with the collector electrode of lower brachium pontis power switch pipe and is the first output of half H bridge converter (6), the emitter of lower brachium pontis power switch pipe is connected with the negative output terminal of half H bridge converter (6) and is the second output of half H bridge converter (6), and the gate pole of two power switch pipes receives the drive singal of a pair complementation that controller provides respectively.
4. a kind of photovoltaic plant based on block coupled in series structure as claimed in claim 1, is characterized in that: described photovoltaic module quantity is n,
Wherein U
d1for the rated value of the total output dc voltage of cascaded structure, U
cfor being connected to the rated value of DC energy storage electric capacity (5) voltage on half H bridge converter (6).
5. a kind of photovoltaic plant based on block coupled in series structure as claimed in claim 1, is characterized in that:
Adopt following control method, comprising:
(1) voltage of the DC energy storage electric capacity (5) of Real-time Collection half and half H bridge converter (6);
(2) for next control cycle, the voltage of the DC energy storage electric capacity (5) of half and half H bridge converter (6) is sorted from high to low;
(3) the half H bridge converter (6) of n before DC energy storage electric capacity (5) voltage alignment is placed in input state, upper brachium pontis power switch pipe by these half H bridges converter (6) is all open-minded, and lower brachium pontis power switch pipe is all closed; All the other half H bridge converters (6) are placed in excision state, and the upper brachium pontis power switch pipe by these half H bridges converter (6) is all closed, and lower brachium pontis power switch pipe is all open-minded; N be greater than 0 natural number.
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| CN109787270B (en) * | 2017-11-13 | 2023-02-24 | 丰郅(上海)新能源科技有限公司 | Voltage converter for power optimization and mode switching method thereof |
| CN110649864A (en) * | 2019-09-20 | 2020-01-03 | 中国电子科技集团公司第十八研究所 | Modularized photovoltaic energy storage system for realizing optimization of photovoltaic and energy storage performance |
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