CN112311006A - Photovoltaic integrated system - Google Patents
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- CN112311006A CN112311006A CN202011095842.1A CN202011095842A CN112311006A CN 112311006 A CN112311006 A CN 112311006A CN 202011095842 A CN202011095842 A CN 202011095842A CN 112311006 A CN112311006 A CN 112311006A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
- G05F1/67—Regulating electric power to the maximum power available from a generator, e.g. from solar cell
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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
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
- H02S10/20—Systems characterised by their energy storage means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/20—Climate change mitigation technologies for sector-wide applications using renewable energy
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Abstract
The invention relates to a photovoltaic integrated system, which is technically characterized in that: the photovoltaic and energy storage unit generated power in the microgrid can be flexibly configured, the system control unit establishes control over each unit based on communication, the photovoltaic power generation part and the energy storage part share the direct current bus, and compared with a traditional common alternating current bus structure, the inverter number is reduced, the size is smaller, and the structure is more compact. Meanwhile, the invention can be suitable for various application scenes, has good practical applicability, and can be applied to a roof photovoltaic energy storage integrated system and an industrial park. Meanwhile, the photovoltaic array PV terminal voltage regulation circuit realizes regulation of the photovoltaic array PV terminal voltage of the current source characteristic by adopting the Boost conversion circuit, and realizes two control modes of maximum power point tracking control (MPPT) and power limit control.
Description
Technical Field
The invention belongs to the technical field of new energy, and particularly relates to a photovoltaic integrated system.
Background
The new energy photovoltaic power generation technology converts solar energy with huge reserves into electric energy, forms powerful supplement to the existing energy consumption system, and has attracted extensive attention in recent years. However, the capacity of independent photovoltaic power generation is small, intermittent fluctuation exists, scattered access brings serious influence on the stability of a power grid, and wide engineering application of the power grid is limited. Practices show that photovoltaic power generation and energy storage are organically combined to form an integrated controllable microgrid which comprises distributed photovoltaic power generation, energy storage, load and a control system thereof, the balance effect of the energy storage under the condition of photovoltaic capacity fluctuation is fully exerted, the capacity is larger, the stability is better, and the method has important significance for effectively improving the permeability and the utilization efficiency of a photovoltaic power supply. At the present stage, related technologies such as microgrid networking architecture, cooperative operation control and micro-source transformation control are in a rapid development stage, and the market demand is large. Meanwhile, the microgrid formed by the photovoltaic power generation, energy storage, load and control units can fully utilize the characteristic of wide photovoltaic distribution and the inhibition capability of the energy storage on photovoltaic fluctuation to form a complementary controllable power generation unit, and has important engineering practice application value.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a photovoltaic integrated system, has good complementary capacity and good peak clipping and valley filling effects, inhibits photovoltaic power fluctuation and effectively improves the utilization rate of photovoltaic power generation.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
the photovoltaic integrated system comprises a photovoltaic power generation part, an energy storage part and an inversion part; the photovoltaic power generation part comprises a photovoltaic array PV and a Boost power converter, the energy storage part comprises an energy storage part and a bidirectional DC/DC converter, and the photovoltaic array PV is connected with the inversion part through the Boost power converter to realize maximum power tracking control and given power tracking control; the stored energy is connected with the inversion part through the bidirectional DC/DC converter to realize the control of voltage and current; the inversion part adopts three-phase full-bridge inversion grid connection and can be connected into the direct current load unit and the alternating current load unit.
And the photovoltaic power generation part and the energy storage part share a direct current bus.
And the photovoltaic power generation part is based on the direct current bus voltage, a Boost conversion circuit formed by a Boost power converter is adopted to realize the regulation of the voltage of the photovoltaic array PV terminal with the characteristics of a current source, and the power tracking control is realized under the condition of the change of illumination temperature.
Also, the power tracking control includes maximum power tracking control MPPT and limited power control.
Moreover, the algorithm for maximum power tracking control MPPT comprises the following steps:
In addition, the energy storage part adopts a Buck-Boost conversion circuit consisting of a bidirectional DC/DC converter to realize voltage/current control, and the voltage/current control is realized by direct-current bus voltage U in a current control modedcThe control of the charge and discharge power of the battery is realized by taking the charge and discharge power as a reference; in the voltage control mode, the voltage of the battery is used as a reference, and the stable control of the voltage of the direct current bus is realized.
In addition, the inverter part converts the three-phase alternating current voltage and current output by the inverter into a rotating coordinate system through coordinate conversion in an active-reactive P/Q mode, and realizes the control of the inverter based on SVPWM by taking the direct current bus voltage and reactive current as control targets and adopting PI closed-loop control; under a voltage-frequency VF mode, three-phase voltage and current output by the inverter are converted into a rotating coordinate system through coordinate conversion, the inverter output voltage and frequency are taken as control targets, PI closed-loop control is adopted, and the inverter is controlled based on SVPWM.
The invention has the advantages and positive effects that:
according to the invention, the generated power of the photovoltaic and energy storage units in the microgrid can be flexibly configured, and the system control unit establishes control of each unit and the photovoltaic power generation part and the energy storage part of the operation parameter configuration on the basis of communication and shares the direct current bus. Meanwhile, the invention can be suitable for various application scenes, has good practical applicability, and can be applied to a roof photovoltaic energy storage integrated system and an industrial park.
According to the photovoltaic array PV load balancing control system, the photovoltaic array PV terminal voltage with the characteristics of the current source is adjusted by adopting the Boost conversion circuit, two control modes of maximum power point tracking control (MPPT) and power limit control are realized, the photovoltaic array PV load balancing control system has good complementary capacity, the peak clipping and valley filling effects are good, the photovoltaic power fluctuation is inhibited, and the utilization rate of photovoltaic power generation is effectively improved. Meanwhile, the micro-grid of the invention is a single controllable unit for an external power grid, has good stability and controllability, and promotes the development of the energy Internet technology.
The inversion part adopts three-phase full-bridge inversion grid connection, has good flexible expansibility, and can be fully accessed to various types of alternating current and direct current power generation units and loads.
The invention improves the power supply safety of the power distribution network, and when the external power grid fails, the micro-grid system can ensure the uninterrupted power supply of the internal important loads.
The invention supports a plurality of operation modes of grid connection/grid disconnection, including photovoltaic maximum/given power tracking function, grid connection inversion P/Q independent control, grid disconnection V/F control, energy storage charging and discharging bidirectional power control and system power dynamic balance control.
Drawings
FIG. 1 is a block diagram of the present invention;
FIG. 2 is a control schematic of the photovoltaic power generation section of the present invention;
FIG. 3 is a flow chart of a maximum power tracking control algorithm of the photovoltaic power generation portion of the present invention;
FIG. 4 is a control schematic of the energy storage portion of the present invention;
FIG. 5 is a control schematic of the inverter section of the present invention;
FIG. 6 is a diagram of parameter settings during simulation according to the present invention;
FIG. 7 is a diagram of a model structure constructed by simulation according to the present invention;
FIG. 8 is a waveform diagram of the system output active power during simulation according to the present invention;
FIG. 9 is a diagram of the system output reactive power waveform during simulation according to the present invention;
FIG. 10 is a DC bus voltage waveform plot during simulation of the present invention;
FIG. 11 is a diagram of MPPT output power waveforms during simulation according to the present invention;
FIG. 12 is a waveform of energy storage charging during simulation of the present invention;
FIG. 13 is a waveform of the discharge in simulation of the present invention;
FIG. 14 is a voltage waveform diagram of the DC bus in an off-grid state during simulation according to the present invention;
FIG. 15 is a waveform diagram of output voltage and current in an off-grid state during simulation according to the present invention;
FIG. 16 is a waveform diagram of the output power at the DC side in the off-grid state during simulation according to the present invention;
FIG. 17 is a graph of photovoltaic and energy storage variation during simulation according to the present invention;
FIG. 18 is a graph of an AC output power waveform in simulation according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The integrated photovoltaic system, as shown in fig. 1, includes a photovoltaic power generation part, an energy storage part and an inversion part, wherein the photovoltaic power generation part and the energy storage part share a dc bus; the photovoltaic power generation part comprises a photovoltaic array PV and a Boost power converter, the energy storage part comprises an energy storage part and a bidirectional DC/DC converter, and the photovoltaic array PV is connected with the inversion part through the Boost power converter to realize maximum power tracking control and given power tracking control; the stored energy is connected with the inversion part through the bidirectional DC/DC converter to realize the control of voltage and current; the inversion part adopts three-phase full-bridge inversion grid connection and can be connected into the direct current load unit and the alternating current load unit. Meanwhile, the power generation power of the power generation part and the power storage part in the micro-grid can be flexibly configured, and the system control unit establishes control and operation parameter configuration on each unit based on communication.
As shown in fig. 2, the photovoltaic power generation part adjusts the voltage of the photovoltaic array PV terminal with the characteristics of a current source by using a Boost conversion circuit formed by a Boost power converter based on the voltage of a direct current bus, and realizes power tracking control under the condition of illumination temperature change. And the power tracking control includes maximum power tracking control MPPT and limited power control.
As shown in fig. 3, the algorithm for maximum power tracking control MPPT includes the following steps:
As shown in fig. 4, the energy storage part adopts a Buck-Boost conversion circuit composed of a bidirectional DC/DC converter to realize voltage/current control, and the direct current bus voltage U is used in the current control modedcThe control of the charge and discharge power of the battery is realized by taking the charge and discharge power as a reference; under the voltage control mode, the voltage of the battery is used as the reference, the stable control of the voltage of the direct current bus is realized, and the voltage support is provided for the later-stage inversion.
According to the topological structure of the inverter, a state equation under a rotating coordinate system under a grid-connected state is obtained by using kirchhoff's law:
wherein R is parasitic resistance of the inductor, UodFor equivalent rotational coordinate components of three-phase network voltage, UoqEquivalent rotational coordinate component, U, of the three-phase network voltagedFor the equivalent rotation coordinate component, U, of the inverter output voltageqIs the equivalent rotational coordinate component of the inverter output voltage. Meanwhile, the capacitor voltage is selected as an intermediate variable, and a state equation of the voltage outer ring in an off-grid state is obtained:
as shown in fig. 5, two mode control algorithms of the grid-connected inverter are obtained according to a mathematical model, in an active-reactive P/Q mode, three-phase alternating current voltage and current output by the inverter are transformed to a rotating coordinate system through coordinate transformation, and the inverter is controlled based on SVPWM by adopting PI closed-loop control with direct current bus voltage and reactive current as control targets; under a voltage-frequency VF mode, three-phase voltage and current output by the inverter are converted into a rotating coordinate system through coordinate conversion, the inverter output voltage and frequency are taken as control targets, PI closed-loop control is adopted, and the inverter is controlled based on SVPWM.
According to the photovoltaic integrated system, the invention is simulated to verify the correctness of the invention:
as shown in FIG. 7, the Matlab/Simulnk modular design is adopted, so that the system has good flexibility, openness, visualization and operability, and can fully meet the requirements of experimental teaching and engineering technicians. Fig. 6 shows the operation mode and functional parameters of the system, which can be set according to actual engineering requirements. The main parameters of the simulation model comprise: the photovoltaic rated power is 50kW, the energy storage maximum power is 50kW, the direct current bus voltage is 600V, the grid-connected voltage is three-phase AC380V, and the main element parameters in the main circuit are R respectivelys＝0.25Ω，Rsh＝5000Ω，Lpv＝10e-3H，Cpv＝1e-6F，L_ES＝10e-3H，C＝20e-3F，L＝2e-3H。
And carrying out experimental analysis on the grid connection of the micro-grid.
Analyzing an independent control experiment of PQ:
a photovoltaic power limiting mode is set through a main interface of the photovoltaic energy storage integrated microgrid simulation system, the PV active power is 30kW, the reactive power is set to be 20kvar, and the voltage of a direct-current bus is 600V. The experimental result of the active power output by the system is shown in fig. 8, the reactive power output by the system is shown in fig. 9, the voltage of the direct-current bus is shown in fig. 10, and the result shows that the micro-grid system can realize active/reactive independent control in a grid-connected mode, has high precision and meets the requirements of engineering practice. Meanwhile, the photovoltaic power generation is set to be under the standard illumination and temperature conditions, the MPPT algorithm is adopted to realize the maximum power tracking effect as shown in fig. 11, the output maximum power is 50kW, and the design requirement is met.
Two-way charge and discharge of energy storage experimental analysis:
fig. 12 shows an energy storage charging waveform diagram, fig. 13 shows a discharging waveform diagram, the charging and discharging power is set to 30kW, a constant current charging method is adopted, the current is constant in the charging process, the SOC of the battery is increased, and the terminal voltage of the battery is slightly increased; by adopting a constant-current discharging method, the current is constant in the discharging process, the SOC of the battery is reduced, and the terminal voltage of the battery is in a decreasing trend, which accords with the theoretical analysis.
And carrying out experimental analysis on the off-grid of the microgrid.
Load test of grid-off VF output belt
In an off-grid state, the load power is set to be 20kW, wherein as shown in FIG. 14, the voltage waveform of an output direct-current bus is about 600V, as shown in FIG. 15, the output single-phase voltage and current waveforms are strictly synchronous in phase and good in waveform quality, as shown in FIG. 16, the output power on the direct-current side is slightly larger than 20kW, and the off-grid state accords with engineering practice.
Experiment of dynamic balance of power
The load power is set to be 25kW in an experiment, the illumination changes, a photovoltaic output power and energy storage SOC dynamic change curve is shown in figure 17, and an alternating current output side power curve is shown in figure 18. The result shows that the energy storage independent load SOC is reduced before photovoltaic access, the energy storage SOC dynamically changes along with the fluctuation of photovoltaic power after photovoltaic access, and the energy storage is automatically charged and discharged to maintain the load power constant, so that the method accords with theoretical analysis.
It should be emphasized that the embodiments described herein are illustrative rather than restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but also includes other embodiments that can be derived from the technical solutions of the present invention by those skilled in the art.
Claims (7)
1. The photovoltaic integrated system is characterized by comprising a photovoltaic power generation part, an energy storage part and an inversion part; the photovoltaic power generation part comprises a photovoltaic array PV and a Boost power converter, the energy storage part comprises an energy storage part and a bidirectional DC/DC converter, and the photovoltaic array PV is connected with the inversion part through the Boost power converter to realize maximum power tracking control and given power tracking control; the stored energy is connected with the inversion part through the bidirectional DC/DC converter to realize the control of voltage and current; the inversion part adopts three-phase full-bridge inversion grid connection and can be connected into the direct current load unit and the alternating current load unit.
2. The pv integration system of claim 1, wherein: the photovoltaic power generation part and the energy storage part share a direct current bus.
3. The pv integration system of claim 1, wherein: the photovoltaic power generation part is based on direct-current bus voltage, a Boost conversion circuit formed by a Boost power converter is used for adjusting the voltage of a photovoltaic array PV terminal with the characteristics of a current source, and power tracking control is realized under the condition of illumination temperature change.
4. The pv integration system of claim 3, wherein: the power tracking control comprises maximum power tracking control (MPPT) and limited power control.
5. The pv integration system of claim 4, wherein: the algorithm for controlling MPPT by maximum power tracking comprises the following steps:
step 1, collecting voltage U of photovoltaic array PV end in real timekAnd current Ik；
Step 2, calculating the power P of the PV end of the photovoltaic arrayk，Wherein P isk＝Uk*Ik；
Step 3, judging the power P of the PV end of the photovoltaic arraykWhether the power P of the PV terminal of the photovoltaic array at the last time is equal to the power P of the PV terminal of the photovoltaic array at the last timek-1If P iskIs equal to Pk-1If not, performing the step 2, otherwise, performing the step 4;
step 4, judging PkWhether or not greater than Pk-1If P iskGreater than Pk-1If not, performing step 6;
step 5, judging UkWhether greater than Uk-1If U is presentkGreater than Uk-1If so, increasing the disturbance voltage delta U, comparing the duty ratio generated by the output of the disturbance voltage delta U with the triangular carrier to form a PWM wave, acting on the Boost power converter, and performing the step 1, otherwise, reducing the disturbance voltage delta U, comparing the duty ratio generated by the output of the disturbance voltage delta U with the triangular carrier to form the PWM wave, acting on the Boost power converter, and performing the step 1;
step 6, judging UkWhether greater than Uk-1If U is presentkGreater than Uk-1And if not, reducing the disturbance voltage delta U, comparing the duty ratio generated by the disturbance voltage delta U output with the triangular carrier wave to form a PWM wave, acting on the Boost power converter, and performing the step 1.
6. The pv integration system of claim 1, wherein: the energy storage part adopts a Buck-Boost conversion circuit consisting of a bidirectional DC/DC converter to realize voltage/current control, and the voltage/current control is realized by direct current bus voltage U in a current control modedcThe control of the charge and discharge power of the battery is realized by taking the charge and discharge power as a reference; in the voltage control mode, the voltage of the battery is used as a reference, and the stable control of the voltage of the direct current bus is realized.
7. The pv integration system of claim 1, wherein: the inverter part converts three-phase alternating current voltage and current output by the inverter into a rotating coordinate system through coordinate conversion in an active-reactive P/Q mode, and realizes the control of the inverter by adopting PI closed-loop control and based on SVPWM (space vector pulse width modulation) with direct-current bus voltage and reactive current as control targets; under a voltage-frequency VF mode, three-phase voltage and current output by the inverter are converted into a rotating coordinate system through coordinate conversion, the inverter output voltage and frequency are taken as control targets, PI closed-loop control is adopted, and the inverter is controlled based on SVPWM.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113644695A (en) * | 2021-08-04 | 2021-11-12 | 艾伏新能源科技(上海)股份有限公司 | Quick power limiting control system for photovoltaic grid-connected system |
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| CN104810858A (en) * | 2015-05-27 | 2015-07-29 | 广西大学 | Control method for grid-connected power generation system of optical storage microgrid |
| CN110768358A (en) * | 2019-09-23 | 2020-02-07 | 上海义阳新能源科技有限公司 | Expandable intelligent light storage system |
| CN111371120A (en) * | 2020-04-22 | 2020-07-03 | 山东科技大学 | Micro-grid smooth switching control system and method based on LCL grid-connected inverter |
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- 2020-10-14 CN CN202011095842.1A patent/CN112311006A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810858A (en) * | 2015-05-27 | 2015-07-29 | 广西大学 | Control method for grid-connected power generation system of optical storage microgrid |
| CN110768358A (en) * | 2019-09-23 | 2020-02-07 | 上海义阳新能源科技有限公司 | Expandable intelligent light storage system |
| CN111371120A (en) * | 2020-04-22 | 2020-07-03 | 山东科技大学 | Micro-grid smooth switching control system and method based on LCL grid-connected inverter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113644695A (en) * | 2021-08-04 | 2021-11-12 | 艾伏新能源科技(上海)股份有限公司 | Quick power limiting control system for photovoltaic grid-connected system |
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