CN104113081B - There is the photovoltaic DC-to-AC converter circuit of no-power compensation function - Google Patents
There is the photovoltaic DC-to-AC converter circuit of no-power compensation function 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a kind of photovoltaic DC-to-AC converter circuit with no-power compensation function, it is characterized in that: photovoltaic cell, through a diode and electric capacity of voltage regulation parallel connection, then through three-phase thyristor bridge circuit, then accesses photovoltaic system through a filter inductance.While the present invention can be implemented in parallel network power generation, realize electric network reactive compensation, and also can realize when grid-connected side voltage is lower than grid-connected point voltage, by the reactive current that inverter is certain to power network compensation, achieve the multi-functional use of device, not only improve the quality of power supply of electrical network, turn improve the utilance of whole system, it also avoid the repeatedly starting and stopping that photovoltaic power generation apparatus is incorporated into the power networks simultaneously, achieve and seamlessly transit.
Description
Technical field
The present invention relates to a kind of photovoltaic DC-to-AC converter circuit with no-power compensation function.
Background technology
Along with the continuous increase of global resources pressure, energy-saving and emission-reduction, resources conservation have become the trend of development of world economy.Electric energy is as the widely used energy of one, and its application has been deep into the every aspect of industrial production, society and people's lives.China's electrical network also exists the shortcomings such as load factor is low, power factor change is frequent, reactive compensation capacity is not enough.Country has formulated relevant policy planning and has dropped into substantial contribution for strengthening electric power system construction and transformation, improving operation of power networks efficiency, reducing electric power energy loss.The problem of power quality more and more caused the attention of people in the last few years.
Along with the improvement of photovoltaic cell production technique, there is power in it and conversion efficiency improves greatly, for large-scale grid connection generating provides green energy resource to become possibility.But there is a shortcoming significantly in parallel network power generation; namely when intensity of illumination is lower or night time; photovoltaic generating system can not reach grid-connected requirement; now whole device must be shut down and be departed from electrical network; the useful life of start-stop meeting influential system so continually, and greatly reduce the utilance of equipment.
Summary of the invention
The object of the present invention is to provide a kind of rational in infrastructure, improve the utilance of photovoltaic generating system and improve the quality of power supply of electrical network, and reducing the photovoltaic DC-to-AC converter circuit with no-power compensation function of the start-stop time of photovoltaic generating system.
Technical solution of the present invention is:
There is a photovoltaic DC-to-AC converter circuit for no-power compensation function, it is characterized in that: photovoltaic cell, through a diode and electric capacity of voltage regulation parallel connection, then through three-phase thyristor bridge circuit, then accesses photovoltaic system through a filter inductance, photovoltaic DC-to-AC converter exports side joint voltage check device, outlet side current sensing means, and voltage check device is connected with an abcdq coordinate converter, voltage Vd, Vq of an abcdq coordinate converter output inverter outlet side, outlet side current sensing means is connected with the 2nd abcdq coordinate converter, inverter load side current detector is separately had to be connected with the 3rd abcdq coordinate converter, described voltage check device is connected with PLL phase-locked loop, PLL phase-locked loop and first, second, 3rd abcdq coordinate converter connects, the current i d that 2nd abcdq coordinate converter exports, iq inputs S-Fuuction module respectively, first comparator, the system that 3rd abcdq coordinate converter exports needs the reactive current IQ compensated to input S-Fuuction module, S-Fuuction module is connected with the first comparator, first comparator is connected with a PI controller, one PI controller is connected with the first calculator, first calculator is connected with the second calculator, second calculator is connected with SPWM modulating device, SPWM modulating device is connected with three-phase thyristor bridge circuit, the positive pole of described photovoltaic cell and the negative pole of described diode are connected with MPTT controller, MPTT controller is connected with the second comparator, the negative pole of described electric capacity of voltage regulation is connected with the second comparator, second comparator is connected with the 2nd PI controller, 2nd PI controller is connected with the 3rd comparator, 3rd comparator is connected with the 3rd PI controller, 3rd PI controller is connected with the 4th comparator, 4th comparator is connected with the first calculator, 3rd comparator is connected with the 2nd abcdq coordinate converter, accepts the output current id from the 2nd abcdq coordinate converter.
The present invention is rational in infrastructure, while can be implemented in parallel network power generation, realize electric network reactive compensation, and also can realize when grid-connected side voltage is lower than grid-connected point voltage, by the reactive current that inverter is certain to power network compensation, achieve the multi-functional use of device, not only improve the quality of power supply of electrical network, turn improve the utilance of whole system.And reduce the start-stop time of photovoltaic generating system.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is the structural representation of one embodiment of the invention.
Fig. 2 referenced reactive current value of the present invention selects flow chart.
Embodiment
Have a photovoltaic DC-to-AC converter circuit for no-power compensation function, photovoltaic cell 1, through a diode 2 and electric capacity of voltage regulation 3 parallel connection, then through three-phase thyristor bridge circuit 4, then accesses photovoltaic system through a filter inductance 5, photovoltaic DC-to-AC converter exports side joint voltage check device 6, outlet side current sensing means, and voltage check device is connected with an abcdq coordinate converter 7, voltage Vd, Vq of an abcdq coordinate converter output inverter outlet side, outlet side current sensing means is connected with the 2nd abcdq coordinate converter 8, inverter load side current detector is separately had to be connected with the 3rd abcdq coordinate converter 9, described voltage check device is connected with PLL phase-locked loop 10, PLL phase-locked loop and first, second, 3rd abcdq coordinate converter connects, the current i d that 2nd abcdq coordinate converter exports, iq inputs S-Fuuction module 11 respectively, first comparator 12, the system that 3rd abcdq coordinate converter exports needs the reactive current IQ compensated to input S-Fuuction module, S-Fuuction module is connected with the first comparator, first comparator is connected with a PI controller 13, one PI controller is connected with the first calculator 14, first calculator is connected with the second calculator 15, second calculator is connected with SPWM modulating device 16, SPWM modulating device is connected with three-phase thyristor bridge circuit, the positive pole of described photovoltaic cell and the negative pole of described diode are connected with MPTT controller 17, MPTT controller is connected with the second comparator 18, the negative pole of described electric capacity of voltage regulation is connected with the second comparator, second comparator is connected with the 2nd PI controller 19, 2nd PI controller is connected with the 3rd comparator 20, 3rd comparator is connected with the 3rd PI controller 21, 3rd PI controller is connected with the 4th comparator 22, 4th comparator is connected with the first calculator, 3rd comparator is connected with the 2nd abcdq coordinate converter, accept the output current id from the 2nd abcdq coordinate converter.
Under this system can be operated in MPPT pattern and pure idle pattern.
When system works is under MPPT pattern, its control strategy is, the command value Vdc* of the DC voltage obtained by photovoltaic maximal power tracing, this command value and the actual DC voltage Vdc obtained that detects compare the difference obtained, through the command value id* of a PI link as active current, this command value and the actual inverter outlet side current i d obtained that detects compare the difference obtained, through the command value ed* of a PI link as modulation voltage.Choose as shown in Figure 2 for referenced reactive current value iq*, when the reactive current Iq that photovoltaic system can compensate is less than the reactive current IQ of system side needs compensation, the command value iq*=Iq of reactive current, when the reactive current Iq that photovoltaic system can compensate is greater than the reactive current IQ of system side needs compensation, the command value iq*=IQ of reactive current.Then this command value iq* and the actual photovoltaic DC-to-AC converter outlet side current i q obtained that detects is compared the difference obtained, through the command value eq* of a PI link as modulation voltage.Ed* and eq* obtained is obtained modulation index MI and modulation angle [alpha] through computing, then according to the θ that modulation index obtains with modulation angle and phase-locked loop, obtains three-phase modulations voltage earef, ebref, ecref.And then these three modulation voltage values and triangular carrier are made comparisons obtain switching signal.The switching signal obtained through overdrive circuit to control photovoltaic DC-to-AC converter.By such control strategy, photovoltaic system just can realize maximum meritorious to system conveying while, reactive power compensation is carried out to system.
When system works is under pure idle pattern, its control strategy is, using the command value Vdc* of a fixed value (being generally 500v) as DC voltage, this command value and the actual DC voltage Vdc obtained that detects compare the difference obtained, through the command value id* of a PI link as active current, the inverter outlet side current i d that this command value and detection obtain compares the difference obtained, through the command value ed* of a PI link as modulation voltage.Choose as shown in Figure 2 for referenced reactive current value iq*, when the reactive current Iq that photovoltaic system can compensate is less than the reactive current IQ of system side needs compensation, the command value iq*=Iq of reactive current, when the reactive current Iq that photovoltaic system can compensate is greater than the reactive current IQ of system side needs compensation, the command value iq*=IQ of reactive current.Then this command value iq* and the actual photovoltaic DC-to-AC converter outlet side current i q obtained that detects is compared the difference obtained, through the command value eq* of a PI link as modulation voltage.Ed* and eq* obtained is obtained modulation index MI and modulation angle [alpha] through computing, then according to the θ that modulation index obtains with modulation angle and phase-locked loop, obtains three-phase modulations voltage earef, ebref, ecref.And then these three modulation voltage values and triangular carrier are made comparisons obtain switching signal.The switching signal obtained through overdrive circuit to control photovoltaic DC-to-AC converter.By such control strategy, photovoltaic system just can realize carrying out reactive power compensation to system.
Pass through the present invention, while can be implemented in parallel network power generation, realize electric network reactive compensation, and also can realize when grid-connected side voltage is lower than grid-connected point voltage, by the reactive current that inverter is certain to power network compensation, achieve the multi-functional use of device, not only improve the quality of power supply of electrical network, turn improve the utilance of whole system.
Claims (1)
1. there is a photovoltaic DC-to-AC converter circuit for no-power compensation function, it is characterized in that: photovoltaic cell, through a diode and electric capacity of voltage regulation parallel connection, then through three-phase thyristor bridge circuit, then accesses photovoltaic system through a filter inductance, photovoltaic DC-to-AC converter exports side joint voltage check device, outlet side current sensing means, and voltage check device is connected with an abc/dq coordinate converter, voltage Vd, Vq of an abc/dq coordinate converter output inverter outlet side, outlet side current sensing means is connected with the 2nd abc/dq coordinate converter, inverter load side current detector is separately had to be connected with the 3rd abc/dq coordinate converter, described voltage check device is connected with PLL phase-locked loop, PLL phase-locked loop and first, second, 3rd abc/dq coordinate converter connects, the current i d that 2nd abc/dq coordinate converter exports inputs S ?Function module, the current i q that 2nd abc/dq coordinate converter exports inputs the first comparator, 3rd abc/dq coordinate converter export system need compensate reactive current IQ input S ?Function module, S ?Function module be connected with the first comparator, first comparator is connected with a PI controller, one PI controller is connected with the first calculator, first calculator is connected with the second calculator, second calculator is connected with SPWM modulating device, SPWM modulating device is connected with three-phase thyristor bridge circuit, the positive pole of described photovoltaic cell and the negative pole of described diode are connected with MPPT controller, MPPT controller is connected with the second comparator, the negative pole of described electric capacity of voltage regulation is connected with the second comparator, second comparator is connected with the 2nd PI controller, 2nd PI controller is connected with the 3rd comparator, 3rd comparator is connected with the 3rd PI controller, 3rd PI controller is connected with the 4th comparator, 4th comparator is connected with the first calculator, 3rd comparator is connected with the 2nd abc/dq coordinate converter, accepts the output current id from the 2nd abc/dq coordinate converter,
When photovoltaic system is operated under MPPT pattern, its control strategy is, the command value Vdc* of the DC voltage obtained by photovoltaic maximal power tracing, this command value and the actual DC voltage Vdc obtained that detects compare the difference obtained, through the command value id* of a PI link as active current, this command value and the actual inverter outlet side current i d obtained that detects compare the difference obtained, through the command value ed* of a PI link as modulation voltage; When the reactive current Iq that photovoltaic system can compensate is less than the reactive current IQ of system side needs compensation, the command value iq*=Iq of reactive current, when the reactive current Iq that photovoltaic system can compensate is greater than the reactive current IQ of system side needs compensation, the command value iq*=IQ of reactive current; Then this command value iq* and the actual photovoltaic DC-to-AC converter outlet side current i q obtained that detects is compared the difference obtained, through the command value eq* of a PI link as modulation voltage; Ed* and eq* obtained is obtained modulation index MI and modulation angle [alpha] through computing, then according to the θ that modulation index obtains with modulation angle and phase-locked loop, obtains three-phase modulations voltage earef, ebref, ecref; And then these three modulation voltage values and triangular carrier are made comparisons obtain switching signal; The switching signal obtained through overdrive circuit to control photovoltaic DC-to-AC converter; By such control strategy, photovoltaic system just can realize maximum meritorious to system conveying while, reactive power compensation is carried out to system;
When photovoltaic system is operated under pure idle pattern, its control strategy is, using the command value Vdc* of a fixed value as DC voltage, this command value and the actual DC voltage Vdc obtained that detects compare the difference obtained, through the command value id* of a PI link as active current, the inverter outlet side current i d that this command value and detection obtain compares the difference obtained, through the command value ed* of a PI link as modulation voltage; When the reactive current Iq that photovoltaic system can compensate is less than the reactive current IQ of system side needs compensation, the command value iq*=Iq of reactive current, when the reactive current Iq that photovoltaic system can compensate is greater than the reactive current IQ of system side needs compensation, the command value iq*=IQ of reactive current; Then this command value iq* and the actual photovoltaic DC-to-AC converter outlet side current i q obtained that detects is compared the difference obtained, through the command value eq* of a PI link as modulation voltage; Ed* and eq* obtained is obtained modulation index MI and modulation angle [alpha] through computing, then according to the θ that modulation index obtains with modulation angle and phase-locked loop, obtains three-phase modulations voltage earef, ebref, ecref; And then these three modulation voltage values and triangular carrier are made comparisons obtain switching signal; The switching signal obtained through overdrive circuit to control photovoltaic DC-to-AC converter; By such control strategy, photovoltaic system just can realize carrying out reactive power compensation to system.
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| CN201410341259.2A CN104113081B (en) | 2014-07-18 | 2014-07-18 | There is the photovoltaic DC-to-AC converter circuit of no-power compensation function |
| 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 |
| CN201510419559.2A CN105024385B (en) | 2014-07-18 | 2014-07-18 | Improve the quality of power supply of power network, have the photovoltaic DC-to-AC converter circuit of no-power compensation function |
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| CN201510419491.8A Division 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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| 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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| 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 |
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| 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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| CN105024401A (en) | 2015-11-04 |
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