CN105024401B - Improve the photovoltaic DC-to-AC converter circuit of the utilization rate of photovoltaic generating system - Google Patents
Improve the photovoltaic DC-to-AC converter circuit of the utilization rate of photovoltaic generating system Download PDFInfo
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a kind of photovoltaic DC-to-AC converter circuit for the utilization rate for improving photovoltaic generating system, it is characterized in that：Photovoltaic cell is in parallel by a diode and electric capacity of voltage regulation, then by three-phase thyristor bridge circuit, then by a filter inductance access photovoltaic system.The present invention can be realized while parallel network power generation, realize to electric network reactive compensation, and it can also realize when grid-connected side voltage is less than grid entry point voltage, pass through the inverter reactive current certain to power network compensation, the multi-functional use of device is realized, not only improves the quality of power supply of power network, improves the utilization rate of whole system again, the repeatedly starting and stopping that photovoltaic power generation apparatus is incorporated into the power networks is it also avoid simultaneously, realizes and seamlessly transits.
Description
The application is that application number 201410341259.2, applying date 2014.7.18, title " have no-power compensation function
The divisional application of photovoltaic DC-to-AC converter circuit ".
Technical field
The present invention relates to a kind of photovoltaic DC-to-AC converter circuit with no-power compensation function.
Background technology
With the continuous increase of global resources pressure, energy-saving and emission-reduction, resources conservation have become becoming for development of world economy
Gesture.For electric energy as a kind of widely used energy, its application has been deep into side's aspect of industrial production, society and people's lives
Face.There is the shortcomings of rate of load condensate is low, power factor change is frequent, reactive compensation capacity is insufficient for China's power network.Country has made
Determined the policy planning of correlation and put into substantial contribution be used to strengthening power system construction and transformation, improve operation of power networks efficiency,
Reduce electric power energy loss.The problem of power quality, had increasingly attracted people's attention in the last few years.
With the improvement of photovoltaic cell production technique, power occurs in it and conversion efficiency greatly improves, and is large-scale grid connection
The offer green energy resource that generates electricity is possibly realized.But parallel network power generation has a significantly shortcoming, i.e., when intensity of illumination is relatively low
Or during night, photovoltaic generating system can not reach grid-connected requirement, now whole device must shut down and depart from power network, so frequent
Ground start-stop can influence the service life of system, and greatly reduce the utilization rate of equipment.
The content of the invention
It is an object of the invention to provide a kind of rational in infrastructure, improve the utilization rate of photovoltaic generating system and improve power network
The quality of power supply, and reduce the photovoltaic DC-to-AC converter circuit with no-power compensation function of the start-stop time of photovoltaic generating system.
The present invention technical solution be：
A kind of photovoltaic DC-to-AC converter circuit with no-power compensation function, it is characterized in that：Photovoltaic cell passes through a diode
It is in parallel with electric capacity of voltage regulation, then by three-phase thyristor bridge circuit, then by a filter inductance access photovoltaic system；Photovoltaic is inverse
Become device output side joint voltage check device, outlet side current sensing means, voltage check device and the first abc dq Coordinate Conversions
Device connects, voltage Vd, Vq of the first abc dq coordinate converter output inverter outlet sides；Outlet side current sensing means and
Two abc dq coordinate converters connect；Separately there is inverter load side current detector to be connected with the 3rd abc dq coordinate converters；
The voltage check device is connected with PLL phaselocked loops, and PLL phaselocked loops and first, second, third abc dq coordinate converters connect
Connecing, electric current id, iq of the output of the 2nd abc dq coordinate converters input S-Fuuction modules, first comparator respectively, and the 3rd
The system of abc dq coordinate converters output needs the reactive current IQ input S-Fuuction modules compensated, S-Fuuction moulds
Block is connected with first comparator, and first comparator is connected with the first PI controllers, and the first PI controllers are connected with the first calculator,
First calculator is connected with the second calculator, and the second calculator is connected with SPWM modulating devices, and SPWM modulating devices and three-phase are complete
Control bridge circuit connection；The negative pole of the positive pole of the photovoltaic cell and the diode is connected with MPTT controllers, MPTT controls
Device is connected with the second comparator, and the negative pole of the electric capacity of voltage regulation is connected with the second comparator, and the second comparator and the 2nd PI are controlled
Device is connected, and the 2nd PI controllers are connected with the 3rd comparator, and the 3rd comparator is connected with the 3rd PI controllers, the 3rd PI controllers
It is connected with the 4th comparator, the 4th comparator is connected with the first calculator, the 3rd comparator and the 2nd abc dq coordinate converters
Connection, receives the output current id from the 2nd abc dq coordinate converters.
The present invention is rational in infrastructure, it is possible to achieve while parallel network power generation, realizes to electric network reactive compensation, and
It can realize when grid-connected side voltage is less than grid entry point voltage, by the inverter reactive current certain to power network compensation,
The multi-functional use of device is realized, not only improves the quality of power supply of power network, improves the utilization rate of whole system again.And
Reduce the start-stop time of photovoltaic generating system.
Brief description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is the structural representation of one embodiment of the invention.
The referenced reactive current value selection flow chart of Fig. 2 present invention.
Embodiment
A kind of photovoltaic DC-to-AC converter circuit with no-power compensation function, photovoltaic cell 1 is by a diode 2 and voltage stabilizing electricity
Hold 3 parallel connections, then by three-phase thyristor bridge circuit 4, then by an access photovoltaic system of filter inductance 5；Photovoltaic DC-to-AC converter
Export side joint voltage check device 6, outlet side current sensing means, voltage check device and the first abc dq coordinate converters 7
Connection, voltage Vd, Vq of the first abc dq coordinate converter output inverter outlet sides；Outlet side current sensing means and second
Abc dq coordinate converters 8 connect；Separately there is inverter load side current detector to be connected with the 3rd abc dq coordinate converters 9；
The voltage check device is connected with PLL phaselocked loops 10, and PLL phaselocked loops and first, second, third abc dq coordinate converters connect
Connecing, electric current id, iq of the output of the 2nd abc dq coordinate converters input S-Fuuction modules 11, first comparator 12 respectively,
The system of 3rd abc dq coordinate converters output needs the reactive current IQ input S-Fuuction modules compensated, S-
Fuuction modules are connected with first comparator, and first comparator is connected with the first PI controllers 13, the first PI controllers and
One calculator 14 is connected, and the first calculator is connected with the second calculator 15, and the second calculator is connected with SPWM modulating devices 16,
SPWM modulating devices are connected with three-phase thyristor bridge circuit；The negative pole and MPTT of the positive pole of the photovoltaic cell and the diode
Controller 17 is connected, and MPTT controllers are connected with the second comparator 18, and the negative pole of the electric capacity of voltage regulation is connected with the second comparator,
Second comparator is connected with the 2nd PI controllers 19, and the 2nd PI controllers are connected with the 3rd comparator 20, the 3rd comparator and
Three PI controllers 21 are connected, and the 3rd PI controllers are connected with the 4th comparator 22, and the 4th comparator is connected with the first calculator, the
Three comparators are connected with the 2nd abc dq coordinate converters, receive the output current id from the 2nd abc dq coordinate converters.
This system can be operated under MPPT patterns and pure idle pattern.
When system is operated under MPPT patterns, its control strategy is the direct current obtained by photovoltaic maximal power tracing
The command value Vdc* of side voltage, this command value and actually detected obtained DC voltage Vdc compare obtained difference, warp
Cross command value id* of the PI link as watt current, this command value and actually detected obtained inverter outlet side electricity
Stream id compares obtained difference, by command value ed* of the PI link as modulation voltage.For referenced reactive current
Value iq* selection is as shown in Fig. 2 when the reactive current Iq that photovoltaic system can compensate for is less than the idle electricity that system side needs to compensate
When flowing IQ, command value iq*=Iq of reactive current, need to mend when the reactive current Iq that photovoltaic system can compensate for is more than system side
During the reactive current IQ repaid, command value iq*=IQ of reactive current.Then this command value iq* and actually detected obtained light
Volt inverter outlet side electric current iq compares obtained difference, by command value eq* of the PI link as modulation voltage.
Obtained ed* and eq* is obtained modulation index MI and modulation angle [alpha] by computing, then according to modulation index and modulation angle
The θ that degree and phaselocked loop obtain, obtains three-phase modulations voltage earef, ebref, ecref.Then again these three modulation voltages
Value and triangular carrier make comparisons to obtain switching signal.Obtained switching signal is controlled photovoltaic DC-to-AC converter through overdrive circuit.
By such control strategy, photovoltaic system can realize it is maximum to system conveying it is active while, system is carried out idle
Compensation.
When system is operated under pure idle pattern, its control strategy is, a fixed value（Usually 500v) conduct
The command value Vdc* of DC voltage, this command value and actually detected obtained DC voltage Vdc compare obtained difference
Value, by command value id* of the PI link as watt current, this command value and detect obtained inverter outlet side
Electric current id compares obtained difference, by command value ed* of the PI link as modulation voltage.Refer to for reactive current
Make value iq* selection as shown in Fig. 2 when the reactive current Iq that photovoltaic system can compensate for be less than system side need compensate it is idle
During electric current IQ, command value iq*=Iq of reactive current, when the reactive current Iq that photovoltaic system can compensate for is more than system side needs
During the reactive current IQ of compensation, command value iq*=IQ of reactive current.Then this command value iq* and actually detected obtain
Photovoltaic DC-to-AC converter outlet side electric current iq compares obtained difference, by command value of the PI link as modulation voltage
eq*.Obtained ed* and eq* is obtained modulation index MI and modulation angle [alpha] by computing, then according to modulation index and tune
The θ that controlling angle and phaselocked loop obtain, obtain three-phase modulations voltage earef, ebref, ecref.Then these three are modulated again
Magnitude of voltage and triangular carrier make comparisons to obtain switching signal.Obtained switching signal is controlled photovoltaic inversion through overdrive circuit
Device.By such control strategy, photovoltaic system can is realized carries out reactive-load compensation to system.
By the invention it is possible to realize while parallel network power generation, realize to electric network reactive compensation, and can also
Realize when grid-connected side voltage is less than grid entry point voltage, by the inverter reactive current certain to power network compensation, realize
The multi-functional use of device, the quality of power supply of power network is not only improved, improve the utilization rate of whole system again.
Claims (1)
1. a kind of photovoltaic DC-to-AC converter circuit for the utilization rate for improving photovoltaic generating system, it is characterized in that：Photovoltaic cell passes through one
Diode and electric capacity of voltage regulation are in parallel, then by three-phase thyristor bridge circuit, then by a filter inductance access photovoltaic system；
Photovoltaic DC-to-AC converter output side joint voltage check device, outlet side current sensing means, voltage check device and the first abc/dq are sat
Mark converter connection, voltage Vd, Vq of the first abc/dq coordinate converter output inverter outlet sides；Outlet side current detecting fills
Put and be connected with the 2nd abc/dq coordinate converters；Separately there are inverter load side current detector and the 3rd abc/dq coordinate converters
Connection；The voltage check device is connected with PLL phaselocked loops, PLL phaselocked loops and first, second, third abc/dq Coordinate Conversions
Device connects, and electric current id, iq of the output of the 2nd abc/dq coordinate converters input S-Function modules, first comparator respectively,
The system of 3rd abc/dq coordinate converters output needs the reactive current IQ input S-Function modules compensated, S-
Function modules are connected with first comparator, and first comparator is connected with the first PI controllers, the first PI controllers and first
Calculator is connected, and the first calculator is connected with the second calculator, and the second calculator is connected with SPWM modulating devices, SPWM modulation dresses
Put and be connected with three-phase thyristor bridge circuit；The negative pole of the positive pole of the photovoltaic cell and the diode connects with MPTT controllers
Connect, MPTT controllers are connected with the second comparator, and the negative pole of the electric capacity of voltage regulation is connected with the second comparator, the second comparator with
2nd PI controllers are connected, and the 2nd PI controllers are connected with the 3rd comparator, and the 3rd comparator is connected with the 3rd PI controllers, the
Three PI controllers are connected with the 4th comparator, and the 4th comparator is connected with the first calculator, the 3rd comparator and the 2nd abc/dq
Coordinate converter connects, and receives the output current id from the 2nd abc/dq coordinate converters；
When system is operated under MPPT patterns, its control strategy is the DC side electricity obtained by photovoltaic maximal power tracing
The command value Vdc* of pressure, this command value and actually detected obtained DC voltage Vdc compare obtained difference, by one
Command value id* of the individual PI links as watt current, this command value and actually detected obtained inverter outlet side electric current id
Obtained difference is compared, by command value ed* of the PI link as modulation voltage；It can compensate for when photovoltaic system
When reactive current Iq is less than the reactive current IQ that system side needs compensate, command value iq*=Iq of reactive current, work as photovoltaic system
When the reactive current Iq that can compensate for is more than the reactive current IQ that system side needs compensate, command value iq*=IQ of reactive current；
Then this command value iq* and actually detected obtained photovoltaic DC-to-AC converter outlet side electric current iq are compared obtained difference, passed through
Cross command value eq* of the PI link as modulation voltage；Obtained ed* and eq* are obtained modulation index MI by computing
With modulation angle [alpha], the θ then obtained according to modulation index and modulation angle and phaselocked loop, three-phase modulations voltage is obtained
earef、ebref、ecref；Then again these three modulation voltage values and triangular carrier are made comparisons to obtain switching signal；Obtaining
Switching signal control photovoltaic DC-to-AC converter through overdrive circuit；
When system is operated under pure idle pattern, its control strategy is, using a fixed value 500V as DC voltage
Command value Vdc*, this command value and actually detected obtained DC voltage Vdc compare obtained difference, by a PI
The inverter outlet side electric current id that command value id* of the link as watt current, this command value and detection obtain is compared
The difference arrived, by command value ed* of the PI link as modulation voltage；When the reactive current that photovoltaic system can compensate for
When Iq is less than the reactive current IQ that system side needs compensate, command value iq*=Iq of reactive current, when photovoltaic system can compensate for
Reactive current Iq be more than system side need compensate reactive current IQ when, command value iq*=IQ of reactive current；Then this
Individual command value iq* and actually detected obtained photovoltaic DC-to-AC converter outlet side electric current iq compare obtained difference, by a PI
Command value eq* of the link as modulation voltage；Obtained ed* and eq* is obtained modulation index MI and modulation angle by computing
Spend α, then according to modulation index and modulation angle and the obtained θ of phaselocked loop, obtain three-phase modulations voltage earef, ebref,
ecref；Then again these three modulation voltage values and triangular carrier are made comparisons to obtain switching signal；Obtained switching signal is passed through
Overdrive circuit controls photovoltaic DC-to-AC converter；By such control strategy, realize and reactive-load compensation is carried out to system.
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| CN201510419491.8A CN105024401B (en) | 2014-07-18 | 2014-07-18 | Improve the photovoltaic DC-to-AC converter circuit of the utilization rate of photovoltaic generating system |
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| CN201510419491.8A CN105024401B (en) | 2014-07-18 | 2014-07-18 | Improve the photovoltaic DC-to-AC converter circuit of the utilization rate of photovoltaic generating system |
| CN201410341259.2A CN104113081B (en) | 2014-07-18 | 2014-07-18 | There is the photovoltaic DC-to-AC converter circuit of no-power compensation function |
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| CN201410341259.2A Division CN104113081B (en) | 2014-07-18 | 2014-07-18 | There is the photovoltaic DC-to-AC converter circuit of no-power compensation function |
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| CN201510419491.8A Active CN105024401B (en) | 2014-07-18 | 2014-07-18 | Improve the photovoltaic DC-to-AC converter circuit of the utilization rate of photovoltaic generating system |
| CN201410341259.2A Active CN104113081B (en) | 2014-07-18 | 2014-07-18 | There is the photovoltaic DC-to-AC converter circuit of no-power compensation function |
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| CN105281368B (en) * | 2015-11-12 | 2017-12-19 | 中国能源建设集团江苏省电力设计院有限公司 | A kind of grid-connected and power quality controlling Unified Control Strategy |
| CN105305505A (en) * | 2015-11-27 | 2016-02-03 | 国家电网公司 | Photovoltaic grid-connected inverter with voltage control function |
| CN106059058B (en) * | 2016-07-15 | 2018-09-28 | 湖北追日电气股份有限公司 | Energy storage off-network inverter improves the system and method for uninterrupted power supply power factor |
| CN107689642A (en) * | 2016-08-03 | 2018-02-13 | 中兴通讯股份有限公司 | Poewr control method, device, inverter apparatus and plant controller |
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| CN102185341B (en) * | 2011-04-14 | 2013-01-02 | 天津大学 | Master-slave control strategy microgrid-based main power supply double-mode running control method |
| KR101269659B1 (en) * | 2011-09-05 | 2013-05-30 | 카코뉴에너지 주식회사 | New and renewable energy generation system and its anti islanding protecting method |
| CN102355007A (en) * | 2011-09-30 | 2012-02-15 | 河北省电力建设调整试验所 | Modeling method for grid-connected photovoltaic power supply based on PSASP (power system analysis software package) |
| CN102611143B (en) * | 2012-03-14 | 2014-03-19 | 电子科技大学 | Method for controlling grid-connected current of three-phase grid-connected inverter |
| CN102856916B (en) * | 2012-04-10 | 2014-10-22 | 北京昆兰新能源技术有限公司 | Reactive power control method and circuit of single-phase photovoltaic inverter |
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| CN101697418A (en) * | 2009-10-23 | 2010-04-21 | 湖南大学 | Photovoltaic inversion grid-connection and harmonic suppression hybrid system for micro grid and composite control method thereof |
| CN103490446A (en) * | 2013-09-24 | 2014-01-01 | 许继集团有限公司 | Operational control method for photovoltaic inverter |
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| CN105024385A (en) | 2015-11-04 |
| CN105024385B (en) | 2017-12-01 |
| CN104113081A (en) | 2014-10-22 |
| CN104113081B (en) | 2016-02-03 |
| CN105024401A (en) | 2015-11-04 |
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