CN103227469B - A kind of suppressing method of photovoltaic combining inverter busbar voltage secondary ripple wave - Google Patents
A kind of suppressing method of photovoltaic combining inverter busbar voltage secondary ripple wave Download PDFInfo
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- CN103227469B CN103227469B CN201210496166.8A CN201210496166A CN103227469B CN 103227469 B CN103227469 B CN 103227469B CN 201210496166 A CN201210496166 A CN 201210496166A CN 103227469 B CN103227469 B CN 103227469B
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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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a kind of suppressing method of photovoltaic combining inverter busbar voltage secondary ripple wave, this suppressing method comprises the steps: 1) the sampling output voltage Upv of photovoltaic battery panel and output current Ipv, obtain grid-connected current command value amplitude iref; 2) grid-connected current command value amplitude iref, power network current value of feedback igrid send into current controller and have obtained grid-connected inverters electric current output algorithm together with line voltage ugrid; 3) command value that current controller exports sends into PWM module, opening or turning off and realize grid-connected current to be sent to electrical network object by control inverter switching tube; 4) power network current obtained is sent into Boost voltage controller, the error signal obtained is outputed signal through PI controller.Suppressing method of the present invention does not need excessively to increase bus capacitor and can effectively suppress because synchronization AC electric current exports the bus secondary ripple wave voltage caused, and realizes simple, and it is convenient to control, and cost is low, successful.
Description
Technical field
The present invention relates to a kind of suppressing method of photovoltaic combining inverter busbar voltage secondary ripple wave.
Background technology
Residents photovoltaic combining inverter power grade is usually at 3-5kW, and for asking most the maximization of efficiency, minimumization of cost, the single-phase stage type of normal employing is without isolating transformer topological structure.This kind of inverter intermediate dc busbar voltage is because there is secondary ripple wave all the time in self reason.This secondary ripple wave is incorporated in control system, produces 3 subharmonic impacts, increase the aberration rate of output current, have impact on grid-connected current quality the meeting of grid-connected current.Conventional art usually adopts and increases intermediate dc bus capacitor to suppress the secondary ripple wave of DC bus-bar voltage.The method can increase machine cost, and effect is no longer obvious when electric capacity is increased to a certain amount of.
Summary of the invention
The object of the present invention is to provide a kind of suppressing method of photovoltaic combining inverter busbar voltage secondary ripple wave, controlled by Boost circuit, introduce power network current feedfoward control to Boost voltage controller, complete the suppression of secondary ripple wave.
The present invention adopts following technical scheme to realize:
A suppressing method for photovoltaic combining inverter busbar voltage secondary ripple wave, is characterized in that, this suppressing method comprises the steps:
1) sample the output voltage Upv of photovoltaic battery panel and output current Ipv, obtains the angle sin θ of line voltage ugrid, be multiplied and obtain grid-connected current command value amplitude iref after obtain two parameters are sent into MPPT controller after electrical network is phase-locked;
2) grid-connected current command value iref, power network current value of feedback igrid send into current controller and have obtained grid-connected inverters electric current output algorithm together with line voltage ugrid;
3) command value that current controller exports sends into PWM module, opening or turning off and realize grid-connected current to be sent to electrical network object by control inverter switching tube;
4) the grid-connected current command value iref obtained is sent into Boost voltage controller, Boost voltage controller by the busbar voltage udc that collects compared with set-point udc_ref, the error signal obtained is obtained error output signal through PI controller, and error output signal and power network current feedover the output signal being added and obtaining Boost voltage controller;
5) Boost voltage controller is exported as modulation signal, the drive singal for driving Boost circuit is obtained compared with triangular carrier according to modulation signal, modulation signal is for changing the size of Boost circuit switch transistor T 5 duty ratio, as worked as busbar voltage udc lower than set-point udc_ref, then error signal is just, then modulation signal increase makes the increase of contactor pipe T5 duty ratio that udc is raised, busbar voltage udc is made to remove tracing preset value udc_ref by such a feedback, when output grid-connected current instantaneous value becomes large, then busbar voltage udc can reduce, then by power network current feedforward, modulation signal is increased.
The Advantageous Effects that the present invention possesses is: do not need excessively to increase bus capacitor to suppress busbar voltage secondary ripple wave, utilize grid-connected current set-point numeral rectification after current feed-forward mutually multiplied with coefficient k, coefficient k is proportionality coefficient, be an adjustable fixed value, by the actuating quantity regulating the size of k value to adjust power network current feedforward.Then export the modulating wave that is added with Boost Voltage loop to obtain switching tube drive waveforms, can effectively suppress because synchronization AC electric current exports the bus secondary ripple wave voltage caused, realize simple, it is convenient to control, and cost is low, successful.
Accompanying drawing explanation
Fig. 1 is the transless isolated form single-phase stage type photovoltaic combining inverter main circuit of prior art.
Fig. 2 is Boost control circuit block diagram.
Fig. 3 is inverter control circuit block diagram.
Fig. 4 is grid-connected voltage and current waveform experiment effect figure.
Fig. 5 is without busbar voltage secondary ripple wave figure of the present invention,
Fig. 6 has busbar voltage secondary ripple wave figure of the present invention.
Embodiment
By below to the description of embodiment; to more contribute to public understanding the present invention; but the restriction that the specific embodiment given by applicant can't be considered as technical solution of the present invention, any definition to parts or technical characteristic change and/or to overall structure do form and immaterial conversion all should be considered as the protection range that technical scheme of the present invention limits.
Transless isolated form single-phase stage type photovoltaic combining inverter main circuit in prior art as shown in Figure 1, the present invention mainly carries out the improvement of control method to it, realize the suppression to busbar voltage secondary ripple wave.In figure, T1-T4 is IGBT, and contactor pipe T5 is MOSFET pipe.
As Fig. 2 and Fig. 3 and shown in composition graphs 1, the suppressing method of photovoltaic combining inverter busbar voltage secondary ripple wave of the present invention comprises the steps:
A suppressing method for photovoltaic combining inverter busbar voltage secondary ripple wave, is characterized in that, this suppressing method comprises the steps:
1) sample the output voltage Upv of photovoltaic battery panel PV and output current Ipv, obtains the angle sin θ of line voltage ugrid, be multiplied and obtain grid-connected current command value amplitude iref after obtain two parameters are sent into MPPT controller after electrical network is phase-locked;
2) grid-connected current command value amplitude iref, power network current value of feedback igrid send into current controller and have obtained grid-connected inverters electric current output algorithm together with line voltage ugrid;
3) command value that current controller exports sends into PWM module, opening or turning off and realize grid-connected current to be sent to electrical network object by control inverter switching tube;
4) the grid-connected current command value iref obtained is sent into Boost voltage controller, Boost voltage controller realizes bus voltage stabilizing and secondary ripple wave voltage suppresses.Boost voltage controller by the busbar voltage udc that collects compared with set-point udc_ref, the error signal obtained is obtained error output signal through PI controller, and error output signal and power network current feedover the output signal being added and obtaining Boost voltage controller.Only this ring can complete busbar voltage stability requirement, but can not suppress busbar voltage secondary ripple wave.By analyzing inverter secondary ripple wave voltage fluctuation reason, it is relevant that known secondary ripple wave voltage and grid-connected current export size.When grid-connected current is larger, secondary ripple wave voltage will inevitably be caused also to there is larger fluctuation.Introduce grid-connected current feedfoward control to Boost voltage link and compensate the impact of grid-connected current on busbar voltage.
5) Boost voltage controller being exported as modulation signal, obtaining the drive singal for driving Boost circuit according to modulation signal compared with triangular carrier, thus reached the stable of busbar voltage and secondary ripple wave voltage suppression object.Modulation signal is for changing the size of Boost circuit switch transistor T 5 duty ratio, as worked as busbar voltage udc lower than set-point udc_ref, then error signal is just, then modulation signal increase makes the increase of contactor pipe T5 duty ratio that udc is raised, and makes busbar voltage remove tracing preset value udc_ref by such a feedback.Become large with exporting grid-connected current instantaneous value, then busbar voltage udc can reduce, then by power network current feedforward, modulation signal is increased, thus makes the increase of switching tube duty ratio make udc rising realize suppressing busbar voltage secondary ripple wave to suppress object.
As shown in Figures 4 to 6, compared with the busbar voltage secondary ripple wave of inventing without this, after adopting suppressing method of the present invention, secondary ripple wave obviously reduces.
Certainly; the present invention can also have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art can make various corresponding change and distortion according to the present invention, but these change accordingly and are out of shape the protection range that all should belong to the claim appended by the present invention.
Claims (1)
1. a suppressing method for photovoltaic combining inverter busbar voltage secondary ripple wave, is characterized in that, this suppressing method comprises the steps:
1) sample the output voltage Upv of photovoltaic battery panel and output current Ipv, obtain two parameters are sent into MPPT controller and obtains grid-connected current command value amplitude Iref, obtain the angle sin θ of line voltage ugrid after electrical network is phase-locked, being multiplied with described angle sin θ by described grid-connected current command value amplitude Iref obtains grid-connected current command value iref;
2) grid-connected current command value iref, power network current value of feedback igrid send into current controller together with line voltage ugrid, obtain contravarianter voltage control command uref;
3) command value that current controller exports sends into PWM module, opening or turning off and realize grid-connected current to be sent to electrical network object by control inverter switching tube;
4) the grid-connected current command value iref obtained is sent into Boost voltage controller, Boost voltage controller by the busbar voltage udc that collects compared with set-point udc_ref, the error signal obtained is obtained error output signal through PI controller, and error output signal and power network current feedover the output signal being added and obtaining Boost voltage controller;
5) Boost voltage controller is exported as modulation signal, the drive singal for driving Boost circuit is obtained compared with triangular carrier according to modulation signal, modulation signal is for changing the size of Boost circuit switch transistor T 5 duty ratio, when busbar voltage udc is lower than set-point udc_ref, then error signal is just, then modulation signal increase makes the increase of contactor pipe T5 duty ratio that udc is raised, busbar voltage udc is made to remove tracing preset value udc_ref by such a feedback, when output grid-connected current instantaneous value becomes large, then busbar voltage udc can reduce, then by power network current feedforward, modulation signal is increased.
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| CN103490653B (en) * | 2013-09-25 | 2016-05-25 | 国网河南省电力公司南阳供电公司 | Grid-connected electric current and DC voltage secondary Ripple Suppression control system and control method |
| CN103633866A (en) * | 2013-11-29 | 2014-03-12 | 南京理工大学 | Device and method for inhibiting single-phase photovoltaic grid-connected inverter input current low frequency pulsation |
| TWI559659B (en) * | 2015-06-05 | 2016-11-21 | Univ Nat Taipei Technology | Active power supply compensation circuit |
| CN106505621B (en) * | 2016-11-28 | 2019-05-17 | 易事特集团股份有限公司 | Inverter and its control method and device |
| CN106899224B (en) * | 2017-05-03 | 2019-03-08 | 浙江埃菲生能源科技有限公司 | A kind of inverter Boost electric current loop vector auxiliary control method |
| CN110401346B (en) * | 2019-07-25 | 2021-07-30 | 合肥巨一动力系统有限公司 | Control method of cascade multiphase staggered parallel Boost converter |
| CN112838657B (en) * | 2021-01-28 | 2023-09-26 | 国网河北省电力有限公司电力科学研究院 | Control method and device of charging system and terminal equipment |
| CN116979608B (en) * | 2023-08-03 | 2024-03-01 | 南通大学 | Overvoltage power limiting control method and system for photovoltaic grid-connected inverter |
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| CN101604848A (en) * | 2009-07-07 | 2009-12-16 | 东南大学 | The modified fuzzy sliding mode controlling method of monopole three-phase photovoltaic grid-connected system |
| CN102761138A (en) * | 2012-07-31 | 2012-10-31 | 慈溪市宇时通信电力设备有限公司 | LCL type grid-connected inverter without resonance damping and integrated design method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101604848A (en) * | 2009-07-07 | 2009-12-16 | 东南大学 | The modified fuzzy sliding mode controlling method of monopole three-phase photovoltaic grid-connected system |
| CN102761138A (en) * | 2012-07-31 | 2012-10-31 | 慈溪市宇时通信电力设备有限公司 | LCL type grid-connected inverter without resonance damping and integrated design method thereof |
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