CN107834604A - A kind of active output control system of photovoltaic plant and method - Google Patents
A kind of active output control system of photovoltaic plant and method Download PDFInfo
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- CN107834604A CN107834604A CN201711251448.0A CN201711251448A CN107834604A CN 107834604 A CN107834604 A CN 107834604A CN 201711251448 A CN201711251448 A CN 201711251448A CN 107834604 A CN107834604 A CN 107834604A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000004146 energy storage Methods 0.000 claims abstract description 98
- 238000012937 correction Methods 0.000 claims description 38
- 230000002441 reversible effect Effects 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
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- H02J3/383—
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- 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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
-
- 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
-
- 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 invention provides a kind of active output control system of photovoltaic plant and method, including photovoltaic generation unit, energy-storage units, first voltage detector, second voltage detector, controller；The energy-storage system is connected in parallel on ac bus with least one photovoltaic generation unit, the first voltage detector is arranged at grid-connected point, for measuring the voltage UPV of photovoltaic electric station grid connection, the second voltage detector is arranged at the energy-storage units output end, for obtaining energy-storage units DC voltage；The controller determines the SOC of the energy-storage units and power demand Pt of power network, and the SOC and grid power demand Pt of the energy-storage units according to the determination, controls the active output of the photovoltaic generation unit.The present invention can accurately calculate the power output distribution of photovoltaic plant according to demand.
Description
Technical field
The invention belongs to new energy field, the more particularly to active output control system of photovoltaic plant and method.
Background technology
In recent years, photovoltaic generation generates electricity as renewable and clean energy resource and greatly developed.Photovoltaic generation have randomness,
How intermittent and uncontrollability, therefore, control the power stability of photovoltaic generation to export, and meets that photovoltaic plant is externally stablized and supplies
Can, it is in the urgent need to address in practical application to be exported for the stable energy of the offers such as power network, charging electric vehicle, then, electricity
Aging occurs in pond again in actual applications, and energy storage is inaccurate, how to coordinate battery and photovoltaic generation unit, both ensured
Energy supply is stable, also ensures that cell safety provides standby guarantee for photovoltaic plant, and this is problem in the urgent need to address at present.
The content of the invention
For problem above, a kind of active output control system of photovoltaic plant of proposition of the invention, including photovoltaic generation unit,
Energy-storage units, the first DC voltage detector, the second DC voltage detector, controller；The energy-storage system with it is at least one
Photovoltaic generation unit is connected in parallel on ac bus, and the first voltage detector is arranged at grid-connected point, for measuring
The voltage UPV of photovoltaic electric station grid connection, the second voltage detector is arranged at the energy-storage units output end, for obtaining energy storage
Unit DC voltage；The controller determines the SOC of the energy-storage units and power demand Pt of power network, and according to
The SOC and grid power demand Pt of the energy-storage units of the determination, control the active output of the photovoltaic generation unit.
The active output control system of described photovoltaic plant, the photovoltaic generation unit output end are connected by combining inverter
Ac bus is connect, the energy-storage units are connected on the ac bus by reversible transducer.
The active output control system of described photovoltaic plant, the controller include voltage jump judge module, amendment meter
Calculate module, SOC on-line corrections module, the first PWM output modules, the 2nd PWM output modules；
The voltage jump judge module is provided with voltage change ratio threshold value, works as DC voltageMore than the voltage change ratio
During threshold value, then start the SOC on-line corrections module；
The corrected Calculation module, for according to DC voltage rate of changeWith energy-storage system power output value, obtain
Energy-storage system SOC correction；
The SOC on-line corrections module, based on the correction calculated, the SOC of energy-storage system is corrected；
The first PWM output modules are used for output pwm signal to control combining inverter；
The 2nd PWM output modules are used for output pwm signal to control reversible transducer.
The active output control system of described photovoltaic plant, when energy-storage units DC voltage rate of changeFor timing,
Show that energy-storage units DC voltage raises, photovoltaic generation unit charges to energy-storage units；During to bear, show to store up
Energy unit DC voltage reduces, energy-storage units electric discharge；
SOC correctionsCalculation formula is as follows：
In formula,For SOC correction factors,For the energy-storage system power output value of current sample time,For energy storage
System nominal power output value,For the rate of change of energy-storage system DC voltage current sample time,For storage
The maximum rate of change of energy system dc side voltage.
The active output control system of described photovoltaic plant, the SOC on-line corrections module are carried out to the SOC of energy-storage units
Correction, the calculation formula of institute's foundation are as follows：
By controlling the first PWM output modules, the 2nd PWM output modules, the SOC of energy-storage units is corrected.
The active output control system of described photovoltaic plant, the controller also includes power deviation determining module, described
Power deviation determining module calculates voltage difference according to the voltage UPV of photovoltaic electric station grid connection, and grid entry point voltage-target Ut
Absolute value delta U；The system impedance X between photovoltaic plant and power network is identified,, wherein,For
Active increment；
Photovoltaic plant grid power demand Pt, Pt=Ut × (Ut-Upv) X+PmUpv × Ut are calculated, wherein,
Pm is the active instantaneous value of photovoltaic electric station grid connection point；
Grid power demand Pt is subtracted to the SOC ' of revised energy-storage units, obtains photovoltaic generation unit minimum generated energy
Pmin, by photovoltaic generation unit minimum generated energy Pmin divided by photovoltaic generation unit total number, it is determined that each photovoltaic generation list
The power output value minimum Psmin of member.
A kind of active output control method of photovoltaic plant, the SOC of energy-storage units is calculated, and SOC is corrected and obtains school
SOC ' after just；Calculate power network demand power Pt；Power network demand power Pt and the SOC ' after correction difference are asked for, determines photovoltaic
Generator unit power power output value minimum Pmin, and calculate each photovoltaic generation unit power output value minimum Psmin.
The active output control method of described photovoltaic plant, calculate the SOC ' after correction and specifically include：When energy-storage units are straight
Flow side voltage change ratioFor timing, show that energy-storage units DC voltage raises, photovoltaic generation unit gives energy storage list
Member charging；During to bear, show the reduction of energy-storage units DC voltage, energy-storage units electric discharge；
SOC correctionsCalculation formula is as follows：
In formula,For SOC correction factors,For the energy-storage system power output value of current sample time,For energy storage
System nominal power output value,For the rate of change of energy-storage system DC voltage current sample time,For
The maximum rate of change of energy-storage system DC voltage；
The calculation formula of institute's foundation is as follows：
。
The active output control method of described photovoltaic plant, calculate grid power demand Pt and specifically include：According to photovoltaic electric
The voltage UPV for standing grid-connected, and grid entry point voltage-target Ut, calculate the absolute value delta U of voltage difference；Identify photovoltaic plant with
System impedance X between power network,, | wherein,For active increment；
Photovoltaic plant grid power demand Pt, Pt=Ut × (Ut-Upv) X+PmUpv × Ut are calculated, wherein,
Pm is the active instantaneous value of photovoltaic electric station grid connection point.
Brief description of the drawings
Fig. 1 is the active output control system schematic diagram of the application photovoltaic plant.
Embodiment
Below in conjunction with the accompanying drawings and instantiation, the present invention is done and further described in detail, but embodiments of the present invention
Not limited to this.
As shown in figure 1, it is the active output control system schematic diagram of the application photovoltaic plant；The present invention proposes a kind of photovoltaic electric
Stand active output control system, including photovoltaic generation unit, such as photovoltaic array, energy-storage units, first voltage detector, second
Voltage detector, controller；The energy-storage system is connected in parallel on ac bus with least one photovoltaic generation unit, described
First voltage detector is arranged at grid-connected point, for measuring the voltage UPV of photovoltaic electric station grid connection, the second voltage detection
Device is arranged at the energy-storage units output end, for obtaining energy-storage units DC voltage；Described in the controller determines
The SOC of the energy-storage units and power demand Pt of power network, and the SOC and grid power need of the energy-storage units according to the determination
Pt is sought, controls the active output of the photovoltaic generation unit.
The active output control system of described photovoltaic plant, the photovoltaic generation unit output end are connected by combining inverter
Ac bus is connect, the energy-storage units are connected on the ac bus by reversible transducer.
The active output control system of described photovoltaic plant, the controller include voltage jump judge module, amendment meter
Calculate module, SOC on-line corrections module, the first PWM output modules, the 2nd PWM output modules；
The voltage jump judge module is provided with voltage change ratio threshold value, works as DC voltageMore than the voltage change ratio
During threshold value, then start the SOC on-line corrections module；
The corrected Calculation module, for according to DC voltage rate of changeWith energy-storage system power output value, obtain
Energy-storage system SOC correction；
The SOC on-line corrections module, based on the correction calculated, the SOC of energy-storage system is corrected；
The first PWM output modules are used for output pwm signal to control combining inverter；
The 2nd PWM output modules are used for output pwm signal to control reversible transducer.
The active output control system of described photovoltaic plant, when energy-storage units DC voltage rate of changeFor timing,
Show that energy-storage units DC voltage raises, photovoltaic generation unit charges to energy-storage units；During to bear, show to store up
Energy unit DC voltage reduces, energy-storage units electric discharge；
SOC correctionsCalculation formula is as follows：
In formula,For SOC correction factors,For the energy-storage system power output value of current sample time,For energy storage
System nominal power output value,For the rate of change of energy-storage system DC voltage current sample time,For storage
The maximum rate of change of energy system dc side voltage.
The active output control system of described photovoltaic plant, the SOC on-line corrections module are carried out to the SOC of energy-storage units
Correction, the calculation formula of institute's foundation are as follows：
By controlling the first PWM output modules, the 2nd PWM output modules, the SOC of energy-storage units is corrected.
The active output control system of described photovoltaic plant, the controller also includes power deviation determining module, described
Power deviation determining module calculates voltage difference according to the voltage UPV of photovoltaic electric station grid connection, and grid entry point voltage-target Ut
Absolute value delta U；The system impedance X between photovoltaic plant and power network is identified,, | wherein,
For active increment；
Photovoltaic plant grid power demand Pt, Pt=Ut × (Ut-Upv) X+PmUpv × Ut are calculated, wherein,
Pm is the active instantaneous value of photovoltaic electric station grid connection point；
Grid power demand Pt is subtracted to the SOC ' of revised energy-storage units, obtains photovoltaic generation unit minimum generated energy
Pmin, by photovoltaic generation unit minimum generated energy Pmin divided by photovoltaic generation unit total number, it is determined that each photovoltaic generation list
The power output value minimum Psmin of member.
A kind of active output control method of photovoltaic plant, the SOC of energy-storage units is calculated, and SOC is corrected and obtains school
SOC ' after just；Calculate power network demand power Pt；Power network demand power Pt and the SOC ' after correction difference are asked for, determines photovoltaic
Generator unit power power output value minimum Pmin, and calculate each photovoltaic generation unit power output value minimum Psmin.
The active output control method of described photovoltaic plant, calculate the SOC ' after correction and specifically include：When energy-storage units are straight
Flow side voltage change ratioFor timing, show that energy-storage units DC voltage raises, photovoltaic generation unit gives energy storage list
Member charging；During to bear, show the reduction of energy-storage units DC voltage, energy-storage units electric discharge；
SOC correctionsCalculation formula is as follows：
In formula,For SOC correction factors,For the energy-storage system power output value of current sample time,For energy storage
System nominal power output value,For the rate of change of energy-storage system DC voltage current sample time,For storage
The maximum rate of change of energy system dc side voltage；
The calculation formula of institute's foundation is as follows：
。
The active output control method of described photovoltaic plant, calculate grid power demand Pt and specifically include：According to photovoltaic electric
The voltage UPV for standing grid-connected, and grid entry point voltage-target Ut, calculate the absolute value delta U of voltage difference；Identify photovoltaic plant with
System impedance X between power network,, wherein,For active increment；
Photovoltaic plant grid power demand Pt, Pt=Ut × (Ut-Upv) X+PmUpv × Ut are calculated, wherein,
Pm is the active instantaneous value of photovoltaic electric station grid connection point.
The present invention can accurately calculate the power output distribution of photovoltaic plant according to demand.Photovoltaic plant and energy-storage battery are matched somebody with somebody
Close, stable is powered for external electrical network or charging equipment, meanwhile, the SOC of battery is corrected in time, improves battery.
Claims (9)
1. a kind of active output control system of photovoltaic plant, it is characterised in that including photovoltaic generation unit, energy-storage units, first
Voltage detector, second voltage detector, controller；The energy-storage system is connected in parallel with least one photovoltaic generation unit
On ac bus, the first voltage detector is arranged at grid-connected point, for measuring the voltage UPV of photovoltaic electric station grid connection,
The second voltage detector is arranged at the energy-storage units output end, for obtaining energy-storage units DC voltage；It is described
Controller determines the SOC of the energy-storage units and power demand Pt of power network, and the SOC of the energy-storage units according to the determination
And grid power demand Pt, control the active output of the photovoltaic generation unit.
2. the active output control system of photovoltaic plant as claimed in claim 1, it is characterised in that the photovoltaic generation unit is defeated
Go out end and ac bus is connected by combining inverter, the energy-storage units are connected to the ac bus by reversible transducer
On.
3. the active output control system of photovoltaic plant as claimed in claim 2, it is characterised in that the controller includes voltage
It is mutated judge module, corrected Calculation module, SOC on-line corrections module, the first PWM output modules, the 2nd PWM output modules；
The voltage jump judge module is provided with voltage change ratio threshold value, works as DC voltageMore than the voltage change ratio
During threshold value, then start the SOC on-line corrections module；
The corrected Calculation module, for according to DC voltage rate of changeWith energy-storage system power output value, obtain
Energy-storage system SOC correction；
The SOC on-line corrections module, based on the correction calculated, the SOC of energy-storage system is corrected；
The first PWM output modules are used for output pwm signal to control combining inverter；
The 2nd PWM output modules are used for output pwm signal to control reversible transducer.
4. the active output control system of photovoltaic plant according to claim 3, it is characterised in that：When energy-storage units DC side
Voltage change ratioFor timing, show that energy-storage units DC voltage raises, photovoltaic generation unit fills to energy-storage units
Electricity；During to bear, show the reduction of energy-storage units DC voltage, energy-storage units electric discharge；
SOC correctionsCalculation formula is as follows：
In formula,For SOC correction factors,For the energy-storage system power output value of current sample time,For energy storage system
System rated power output valve,For the rate of change of energy-storage system DC voltage current sample time,For energy storage
The maximum rate of change of system dc side voltage.
5. the active output control system of photovoltaic plant according to claim 4, it is characterised in that：The SOC on-line corrections
Module is corrected to the SOC of energy-storage units, and the calculation formula of institute's foundation is as follows：
By controlling the first PWM output modules, the 2nd PWM output modules, the SOC of energy-storage units is corrected.
6. the active output control system of photovoltaic plant according to claim 5, it is characterised in that the controller also includes
Power deviation determining module, the power deviation determining module is according to the voltage UPV of photovoltaic electric station grid connection, and grid entry point voltage
Desired value Ut, calculate the absolute value delta U of voltage difference；The system impedance X between photovoltaic plant and power network is identified,, | wherein,For active increment；
Photovoltaic plant grid power demand Pt, Pt=Ut × (Ut-Upv) X+PmUpv × Ut are calculated, wherein,
Pm is the active instantaneous value of photovoltaic electric station grid connection point；
Grid power demand Pt is subtracted to the SOC ' of revised energy-storage units, obtains photovoltaic generation unit minimum generated energy
Pmin, by photovoltaic generation unit minimum generated energy Pmin divided by photovoltaic generation unit total number, it is determined that each photovoltaic generation list
The power output value minimum Psmin of member.
7. a kind of active output control method of photovoltaic plant, it is characterised in that calculate the SOC of energy-storage units, and school is carried out to SOC
SOC ' after just being corrected；Calculate power network demand power Pt；Power network demand power Pt and the SOC ' after correction difference are asked for,
Photovoltaic generation unit power power output value minimum Pmin is determined, and it is minimum to calculate each photovoltaic generation unit power output value
Psmin。
8. the active output control method of photovoltaic plant as claimed in claim 7, it is characterised in that calculate the SOC ' tools after correction
Body includes：When energy-storage units DC voltage rate of changeFor timing, show that energy-storage units DC voltage raises, photovoltaic
Generator unit charges to energy-storage units；During to bear, show the reduction of energy-storage units DC voltage, energy-storage units are put
Electricity；
SOC correctionsCalculation formula is as follows：
In formula,For SOC correction factors,For the energy-storage system power output value of current sample time,For energy storage
System nominal power output value,For the rate of change of energy-storage system DC voltage current sample time,For storage
The maximum rate of change of energy system dc side voltage；
The calculation formula of institute's foundation is as follows：
。
9. the active output control method of photovoltaic plant as claimed in claim 8, it is characterised in that calculate grid power demand Pt
Specifically include：According to the voltage UPV of photovoltaic electric station grid connection, and grid entry point voltage-target Ut, the absolute of voltage difference is calculated
It is worth Δ U；The system impedance X between photovoltaic plant and power network is identified,, wherein,To be active
Increment；
Photovoltaic plant grid power demand Pt, Pt=Ut × (Ut-Upv) X+PmUpv × Ut are calculated, wherein,
Pm is the active instantaneous value of photovoltaic electric station grid connection point.
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| CN108494023A (en) * | 2018-04-06 | 2018-09-04 | 冯辉 | A kind of active output control system of photovoltaic plant and method |
| CN113162128A (en) * | 2021-04-16 | 2021-07-23 | 沈阳微控新能源技术有限公司 | Photovoltaic power station integrated with flywheel energy storage system and control method |
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| CN107834604B (en) | 2020-09-18 |
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