CN101330219A - Multifunctional photovoltaic parallel inverting device - Google Patents
Multifunctional photovoltaic parallel inverting device Download PDFInfo
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- CN101330219A CN101330219A CNA2008101231489A CN200810123148A CN101330219A CN 101330219 A CN101330219 A CN 101330219A CN A2008101231489 A CNA2008101231489 A CN A2008101231489A CN 200810123148 A CN200810123148 A CN 200810123148A CN 101330219 A CN101330219 A CN 101330219A
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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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- 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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a multifunctional grid-connected photovoltaic inverter which comprises a main circuit connected with a power network; a signal acquisition module used for acquiring the DC voltage signal, the power network side voltage, the power network side current and the transformer original side current of the array voltage of a cell panel is respectively connected with a maximum power tracking control unit, a current control unit, an instantaneous and reactive calculating unit and an instruction current calculating unit; the maximum power tracking control unit is connected with a voltage regulation control unit; the voltage regulation control unit is connected with the instruction current calculating unit; and the instruction current calculating unit is connected with the current control unit and the instantaneous current calculating unit. The inverter has reasonable structure, and enables the inverting circuit to run in different states through changing the crest value and the phase of the inventing voltage, thereby realizing the multifunctional grid-connected photovoltaic inverter with grid-connected active or reactive function.
Description
Technical field:
Patent of the present invention belongs to photovoltaic generation and electric and electronic technical field, is specifically related to a kind of three-phase photovoltaic grid-connected inverting device with power quality controlling.
Background technology
Along with becoming increasingly conspicuous of energy scarcity in the global range and safety problem, it is to tackle the serious day by day energy and environmental problem that factors such as the increasing day by day of environmental pollution impel more and more countries to come to realise the development and use of strengthening regenerative resource, realizes the only way of sustainable development.Along with the world to the craving for of generation of electricity by new energy, the parallel network power generation scale will enlarge more rapidly, application surface will be wideer.
Border district away from electrical network, as the power supply of rural area, be in the tip of weak electrical network, the reactive power of user load can produce considerable influence to line voltage, reactive power compensation to load is preferably compensated on the spot, if adopt special-purpose active power filtering and reactive-load compensation equipment, its compensation characteristic and effect are good, but this need increase additional investment.What multifunctional photovoltaic parallel inverting device adopted is the voltage-type inverter main circuit, this main circuit can be realized the control of active power filtering and reactive power compensation, and extensive studies and application have been obtained in practice, with grid-connected Generation Control and reactive power compensation, active power filtering control combines, formation is generated electricity by way of merging two or more grid systems, the integral control system of reactive power compensation and active power filtering, so not only can carry out photovoltaic generation effectively, improve power supply quality and reduce power loss, and can make multi-functional parallel network reverse device obtain peak use rate and generation high economic benefit day and night, be the inexorable trend of generating electricity by way of merging two or more grid systems from now on.
Summary of the invention:
The object of the present invention is to provide a kind of rational in infrastructurely,, just can make inverter current operate in different states, gain merit or the multifunctional photovoltaic parallel inverting device of idle function thereby realize being incorporated into the power networks sending out by changing the amplitude and the phase place of inverter voltage.
Technical solution of the present invention is:
A kind of multifunctional photovoltaic parallel inverting device is characterized in that: comprise the main circuit that is connected with electrical network, gather the panel array voltage U for one
DcD. c. voltage signal, grid side voltage U
R, U
S, U
T, the grid side electric current I
R, I
S, I
T, the former avris electric current I of transformer
a, I
b, I
cSignal acquisition module and definite solar cell array maximum power point maximal power tracing control unit, the current control unit of finishing the control of synchronization AC current tracking, detection of grid idle component the instantaneous reactive computing unit, be connected in real component and the instruction current computing unit that idle component is synthesized, the maximal power tracing control unit is connected with the voltage-regulation control unit, voltage-regulation control unit and instruction current calculation unit connects, and the instruction current computing unit is connected with current control unit, transient current computing unit; Wherein main circuit has the inversion master unit; the inversion master unit comprises the three-phase circuit that six IGBT devices are formed; each IGBT device all has the RCD that protects to absorb circuit; the dc bus of circuit links to each other with the energy-storage units of solar panel; load piezo-resistance ZR1 at the dc bus two ends; six IGBT devices have three groups of power driver modules to drive; its output becomes sine-wave current through after the filtering; send into the former limit of transformer; the secondary coil of transformer is connected with the A.C. contactor of master control module controls; A.C. contactor leaves to link to each other with sky again and inserts electrical network, loads in the access grid side and carries out endomomental piezo-resistance.
The present invention is rational in infrastructure, by changing the amplitude and the phase place of inverter voltage, just can make inverter current operate in different states, gain merit or idle function thereby realize being incorporated into the power networks sending out, in high efficiency, high reliability, can either generate electricity by way of merging two or more grid systems, can carry out the Multifunction photovoltaic grid-connected device of power quality controlling again, this device is particularly useful for the border district away from electrical network.
Description of drawings:
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the configuration diagram of one embodiment of the invention.
Fig. 2 is a main circuit diagram.
Fig. 3 is the circuit diagram of 485 communication lines.
Fig. 4 is the circuit diagram of 232 communication lines.
Embodiment:
A kind of multifunctional photovoltaic parallel inverting device is characterized in that: comprise 1, one collection of main circuit cell panel (PV) array voltage U that is connected with electrical network
DcD. c. voltage signal, grid side voltage U
R, U
S, U
T, the grid side electric current I
R, I
S, I
T, the former avris electric current I of transformer
a, I
b, I
cSingle 2 of the maximal power tracing control, the current control unit 3 of finishing the control of synchronization AC current tracking, the instantaneous reactive computing unit 4 of detection of grid idle component, the instruction current computing unit 5 that real component and idle component are synthesized of signal acquisition module and definite solar cell array maximum power point be connected, the maximal power tracing control unit is connected with voltage-regulation control unit 6, voltage-regulation control unit and instruction current calculation unit 5 connects, and the instruction current computing unit is connected with current control unit, transient current computing unit; Wherein main circuit has the inversion master unit; the inversion master unit comprises the three-phase circuit that six IGBT devices are formed; each IGBT device all has RCD absorption circuit to protect; prevent that overcurrent or overvoltage are to the IGBT components from being damaged; the dc bus of circuit links to each other with the energy-storage units of solar panel (being exactly C1 among the figure～C12 electric capacity); disturb, destroy the inversion device for the overvoltage pulse that prevents the solar panel place, loaded piezo-resistance ZR1, be used to absorb overvoltage pulse at the dc bus two ends.Six IGBT devices have three groups of power driver modules to drive, become sine-wave current after its output process LC filtering, send into the former limit of transformer (being Δ/Y transformer among the figure), the secondary coil of transformer connects the A.C. contactor ZK1 by master control module controls, A.C. contactor ZK1 leaves ZK2 with sky again and links to each other and insert electrical network, for preventing the influence of line voltage pulse, carry out the pulse absorption at access grid side loading piezo-resistance ZR2, ZR3 and ZR4 to inverter.
Control unit TMPPT among Fig. 3 (indicating the square frame of TMPPT among the figure) is the maximal power tracing control unit, it finishes determining of solar cell array maximum power point operating voltage Udc, and according to the power output and the voltage magnitude size identification day and night of photovoltaic array.AVR (indicating the square frame of AVR among the figure) is the voltage-regulation control unit, and its adjusting is output as the given ip of amplitude of grid-connected current real component
*The idle component of instantaneous reactive computing unit detection of grid electric current, because the ip, the iq compute mode that adopt in the algorithm, need use the synchronous sinusoidal signal sin wt of line voltage and corresponding cosine signal cos wt mutually with A, they are obtained by digital phase-locked loop (PLL) and the sine table of DSP, determine reactive power compensation current i q thus
*, in the instruction current computing unit, real component and idle component are synthesized, finally obtain the synchronization AC current instruction value of PVPC.Current control unit is finished the tracking Control of synchronization AC electric current, adopts the SPWM close-loop control mode, guarantees the phase error and the amplitude error of current tracking, and this also is a key link.
When solar power system and mains system parallel operation, when the civil power system of breaking down fails in time to detect and cut off mains system, and produce independently-powered phenomenon.When in case island effect takes place, can cause the damage of injury to personnel and equipment, so system design must possess this effect detecting defencive function.The present invention is when having passive detection island effect method, added improved active island effect detection method one frequency difference phase shift mode, under multiple loading condition, done anti-isolated island experimental study, experiment shows, anti-isolated island response time when this mode can be accelerated load matched, has stronger antinoise capability of influence.
Adopt 485 communication modes between photovoltaic network inverter of the present invention and liquid-crystal controller, as shown in Figure 4, transmission, reception and controller signals are all by high speed 6N136 light-coupled isolation.Utilize MAX485 as communication interface chip, MAX485 is a kind of difference balanced type low-power transceiving chip, and employing+5V power supply is exclusively used in the conversion between TTL agreement and 485 agreements.
Liquid-crystal controller of the present invention adopts ARM7 to control, and selects RS232 with upper machine communication, as shown in Figure 5, or the RS485 mode, RAM7 can realize embedded system, is convenient to the systemic-function expansion, the exploitation of accessories of a product.For avoiding the phase mutual interference, realize isolating by optocoupler.
Claims (1)
1, a kind of multifunctional photovoltaic parallel inverting device is characterized in that: comprise the main circuit that is connected with electrical network, gather the panel array voltage U for one
DcD. c. voltage signal, grid side voltage U
R, U
S, U
T, the grid side electric current I
R, I
S, I
T, the former avris electric current I of transformer
a, I
b, I
cSignal acquisition module and definite solar cell array maximum power point maximal power tracing control unit, the current control unit of finishing the control of synchronization AC current tracking, detection of grid idle component the instantaneous reactive computing unit, be connected in real component and the instruction current computing unit that idle component is synthesized, the maximal power tracing control unit is connected with the voltage-regulation control unit, voltage-regulation control unit and instruction current calculation unit connects, and the instruction current computing unit is connected with current control unit, transient current computing unit; Wherein main circuit has the inversion master unit; the inversion master unit comprises the three-phase circuit that six IGBT devices are formed; each IGBT device all has the RCD that protects to absorb circuit; the dc bus of circuit links to each other with the energy-storage units of solar panel; load piezo-resistance ZR1 at the dc bus two ends; six IGBT devices have three groups of power driver modules to drive; its output becomes sine-wave current through after the filtering; send into the former limit of transformer; the secondary coil of transformer is connected with the A.C. contactor of master control module controls; A.C. contactor leaves to link to each other with sky again and inserts electrical network, loads in the access grid side and carries out endomomental piezo-resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101231489A CN101330219A (en) | 2008-06-06 | 2008-06-06 | Multifunctional photovoltaic parallel inverting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101231489A CN101330219A (en) | 2008-06-06 | 2008-06-06 | Multifunctional photovoltaic parallel inverting device |
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|---|---|
| CN101330219A true CN101330219A (en) | 2008-12-24 |
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| CNA2008101231489A Pending CN101330219A (en) | 2008-06-06 | 2008-06-06 | Multifunctional photovoltaic parallel inverting device |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101777775A (en) * | 2010-02-26 | 2010-07-14 | 东南大学 | High-frequency isolation single-phase photovoltaic grid-connected system and control method thereof |
| CN102222935A (en) * | 2011-06-15 | 2011-10-19 | 中国电力科学研究院 | Grid-connected full digital monitoring system for controllable high-temperature superconducting magnetic energy storage (SMES) system |
| CN102299525A (en) * | 2011-09-08 | 2011-12-28 | 天津理工大学 | Hybrid control device for grid-connected photovoltaic power generating system and control method of hybrid control device |
| CN101534015B (en) * | 2009-04-10 | 2012-10-24 | 保定天威集团有限公司 | Three-phase photovoltaic grid-connected inverting control method |
| CN102969735A (en) * | 2012-10-30 | 2013-03-13 | 中南大学 | Photovoltaic flexibility grid-connection device and control method |
| CN105186552A (en) * | 2015-07-15 | 2015-12-23 | 天津伟力盛世节能科技股份有限公司 | Three-phase sine wave photovoltaic inverter |
| CN105305505A (en) * | 2015-11-27 | 2016-02-03 | 国家电网公司 | Photovoltaic grid-connected inverter with voltage control function |
| EP2478610A4 (en) * | 2009-09-15 | 2016-08-10 | Univ Western Ontario | Utilization of distributed generator inverters as statcom |
| CN108306343A (en) * | 2018-01-31 | 2018-07-20 | 深圳市德兰明海科技有限公司 | A kind of load current calculating method, apparatus and two-way inverter |
| CN108574427A (en) * | 2017-03-10 | 2018-09-25 | 西门子公司 | Transducer brake unit and frequency converter |
| CN114447994A (en) * | 2022-04-11 | 2022-05-06 | 江苏黑马高科股份有限公司 | Reactive compensation grid-connected method and system suitable for new energy intelligent grid-connected cabinet |
| US11784496B2 (en) | 2009-09-15 | 2023-10-10 | Rajiv Kumar Varma | Utilization of distributed generator inverters as STATCOM |
-
2008
- 2008-06-06 CN CNA2008101231489A patent/CN101330219A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101534015B (en) * | 2009-04-10 | 2012-10-24 | 保定天威集团有限公司 | Three-phase photovoltaic grid-connected inverting control method |
| US10256635B2 (en) | 2009-09-15 | 2019-04-09 | Rajiv Kumar Varma | Utilization of distributed generator inverters as STATCOM |
| US11784496B2 (en) | 2009-09-15 | 2023-10-10 | Rajiv Kumar Varma | Utilization of distributed generator inverters as STATCOM |
| US11211799B2 (en) | 2009-09-15 | 2021-12-28 | Rajiv Kumar Varma | Utilization of distributed generator inverters as STATCOM |
| EP2478610A4 (en) * | 2009-09-15 | 2016-08-10 | Univ Western Ontario | Utilization of distributed generator inverters as statcom |
| CN101777775A (en) * | 2010-02-26 | 2010-07-14 | 东南大学 | High-frequency isolation single-phase photovoltaic grid-connected system and control method thereof |
| CN102222935A (en) * | 2011-06-15 | 2011-10-19 | 中国电力科学研究院 | Grid-connected full digital monitoring system for controllable high-temperature superconducting magnetic energy storage (SMES) system |
| CN102222935B (en) * | 2011-06-15 | 2014-03-12 | 中国电力科学研究院 | Grid-connected full digital monitoring system for controllable high-temperature superconducting magnetic energy storage (SMES) system |
| CN102299525A (en) * | 2011-09-08 | 2011-12-28 | 天津理工大学 | Hybrid control device for grid-connected photovoltaic power generating system and control method of hybrid control device |
| CN102299525B (en) * | 2011-09-08 | 2013-12-11 | 天津理工大学 | Hybrid control device for grid-connected photovoltaic power generating system and control method of hybrid control device |
| CN102969735A (en) * | 2012-10-30 | 2013-03-13 | 中南大学 | Photovoltaic flexibility grid-connection device and control method |
| CN105186552A (en) * | 2015-07-15 | 2015-12-23 | 天津伟力盛世节能科技股份有限公司 | Three-phase sine wave photovoltaic inverter |
| CN105305505A (en) * | 2015-11-27 | 2016-02-03 | 国家电网公司 | Photovoltaic grid-connected inverter with voltage control function |
| CN108574427A (en) * | 2017-03-10 | 2018-09-25 | 西门子公司 | Transducer brake unit and frequency converter |
| CN108574427B (en) * | 2017-03-10 | 2022-06-28 | 西门子公司 | Frequency converter brake unit and frequency converter |
| CN108306343A (en) * | 2018-01-31 | 2018-07-20 | 深圳市德兰明海科技有限公司 | A kind of load current calculating method, apparatus and two-way inverter |
| CN114447994A (en) * | 2022-04-11 | 2022-05-06 | 江苏黑马高科股份有限公司 | Reactive compensation grid-connected method and system suitable for new energy intelligent grid-connected cabinet |
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Open date: 20081224 |