CN103227469A - Secondary ripple wave suppression method for bus voltage of photovoltaic grid-connected inverter - Google Patents
Secondary ripple wave suppression method for bus voltage of photovoltaic grid-connected inverter Download PDFInfo
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- CN103227469A CN103227469A CN2012104961668A CN201210496166A CN103227469A CN 103227469 A CN103227469 A CN 103227469A CN 2012104961668 A CN2012104961668 A CN 2012104961668A CN 201210496166 A CN201210496166 A CN 201210496166A CN 103227469 A CN103227469 A CN 103227469A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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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
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- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a secondary ripple wave suppression method for bus voltage of a photovoltaic grid-connected inverter. The suppression method comprises the following steps: (1), sampling output voltage Upv and output current Ipv of a photovoltaic cell panel to obtain the amplitude value iref of a grid-connected current instruction value; (2), sending the amplitude value iref of the grid-connected current instruction value, a grid current feedback value igrid and grid voltage ugrid to a current controller together to obtain and finish an inverter grid-connected current output algorithm; (3), sending the instruction value output by the current controller to a PWM (pulse-width modulation) module, and sending the grid-connected current to the grid through controlling connection or disconnection of a switch tube of the inverter; and (4), sending the obtained grid current to a Boost voltage controller, and enabling an obtained error signal to pass through an PI (proportional-integral) controller to obtain an output signal. The suppression method can suppress the secondary ripple wave voltage of a bus caused by grid-connected alternating current output effectively without increasing bus capacitance excessively, and has the advantages of simplicity in implementation, convenience for control, low cost and obvious effect.
Description
Technical field
The present invention relates to a kind of inhibition method of photovoltaic combining inverter busbar voltage secondary ripple.
Background technology
Residents photovoltaic combining inverter power grade is the maximization of asking efficient most, minimumization of cost usually at 3-5kW, often adopts single-phase stage type not have the isolating transformer topological structure.This kind inverter intermediate dc busbar voltage is because there is the secondary ripple all the time in self reason.This secondary ripple is incorporated in the control system, and the meeting of grid-connected current is produced the influence of 3 subharmonic, has increased the aberration rate of output current, has influenced the grid-connected current quality.Conventional art adopts usually and increases the secondary ripple that the intermediate dc bus capacitor suppresses DC bus-bar voltage.The method can increase machine cost, and to be increased to when a certain amount of effect no longer obvious when electric capacity.
Summary of the invention
The object of the present invention is to provide a kind of inhibition method of photovoltaic combining inverter busbar voltage secondary ripple, control, introduce the power network current feedfoward control for the Boost voltage controller, finish the inhibition of secondary ripple by the Boost circuit.
The present invention adopts following technical scheme to realize:
A kind of inhibition method of photovoltaic combining inverter busbar voltage secondary ripple is characterized in that this inhibition method comprises the steps:
1) the output voltage U pv and the output current Ipv of sampling photovoltaic battery panel send two parameters that obtain into the angle sin θ that obtains line voltage ugrid behind the MPPT controller after electrical network is phase-locked, and multiplying each other obtains grid-connected current command value amplitude iref;
2) grid-connected current command value iref, power network current value of feedback igrid and line voltage ugrid send into current controller together and obtain finishing inverter grid-connected current output algorithm;
3) command value of current controller output is sent into the PWM module, opening or turn-offing and realize grid-connected current is sent to the electrical network purpose by the control inverter switching tube;
4) the grid-connected current command value iref that obtains is sent into the Boost voltage controller, the Boost voltage controller is compared the busbar voltage udc that collects with set-point udc_ref, the error signal that obtains is obtained the error output signal through the PI controller, and error output signal and power network current feedforward addition obtain the output signal of Boost voltage controller;
5) the Boost voltage controller is exported as modulation signal, compare with triangular carrier according to modulation signal and to obtain to be used to drive the drive signal of Boost circuit, modulation signal is used to change the size of Boost contactor pipe T5 duty ratio, as being lower than set-point udc_ref as busbar voltage udc, then error signal is for just, then the modulation signal increase makes the increase of contactor pipe T5 duty ratio make udc raise, make busbar voltage udc remove tracing preset value udc_ref by a such feedback, when output grid-connected current instantaneous value becomes big, then busbar voltage udc can reduce, and then makes modulation signal increase by the power network current feedforward.
The useful technique effect that the present invention possesses is: do not need excessively to increase bus capacitor and suppress busbar voltage secondary ripple, utilize after the rectification of grid-connected current set-point numeral with coefficient k multiply each other current feed-forward, coefficient k is proportionality coefficient, be an adjustable fixed value, adjust the actuating quantity of power network current feedforward by the size of regulating the k value.Modulating wave with Boost Voltage loop output addition obtains the switching tube drive waveforms then, can effectively suppress because the bus secondary ripple voltage that the output of synchronization AC electric current causes realizes that simply, control is convenient, and cost is low, and effect is obvious.
Description of drawings
Fig. 1 is the single-phase stage type photovoltaic combining inverter of the transless isolated form main circuit of prior art.
Fig. 2 is a Boost control circuit block diagram.
Fig. 3 is the inverter control circuit block diagram.
Fig. 4 is the voltage and current waveform experiment effect figure that is incorporated into the power networks.
Fig. 5 is no busbar voltage secondary ripple figure of the present invention,
Fig. 6 has busbar voltage secondary ripple figure of the present invention.
Embodiment
By following description to embodiment; to help public understanding the present invention more; but can't the specific embodiment that the applicant is given be considered as restriction to technical solution of the present invention, any definition to parts or technical characterictic change and/or to overall structure do form but not the conversion of essence all should be considered as the protection range that technical scheme of the present invention limits.
The single-phase stage type photovoltaic combining inverter of transless isolated form main circuit in the prior art as shown in Figure 1, the present invention mainly carries out the improvement of control method to it, realizes the inhibition to busbar voltage secondary ripple.T1-T4 is IGBT among the figure, and contactor pipe T5 is the MOSFET pipe.
As Fig. 2 and Fig. 3 and in conjunction with shown in Figure 1, the inhibition method of photovoltaic combining inverter busbar voltage secondary ripple of the present invention comprises the steps:
A kind of inhibition method of photovoltaic combining inverter busbar voltage secondary ripple is characterized in that this inhibition method comprises the steps:
1) output voltage U pv and the output current Ipv of sampling photovoltaic battery panel PV send two parameters that obtain into the angle sin θ that obtains line voltage ugrid behind the MPPT controller after electrical network is phase-locked, and multiplying each other obtains grid-connected current command value amplitude iref;
2) grid-connected current command value amplitude iref, power network current value of feedback igrid and line voltage ugrid send into current controller together and obtain finishing inverter grid-connected current output algorithm;
3) command value of current controller output is sent into the PWM module, opening or turn-offing and realize grid-connected current is sent to the electrical network purpose by the control inverter switching tube;
4) the grid-connected current command value iref that obtains is sent into the Boost voltage controller, the Boost voltage controller realizes that bus voltage stabilizing and secondary ripple voltage suppress.The Boost voltage controller is compared the busbar voltage udc that collects with set-point udc_ref, the error signal that obtains is obtained the error output signal through the PI controller, and error output signal and power network current feedforward addition obtain the output signal of Boost voltage controller.Only this ring can be finished the busbar voltage stability requirement, but can not suppress busbar voltage secondary ripple.By analyzing inverter secondary ripple voltage cause of fluctuation, the secondary ripple voltage is relevant with grid-connected current output size as can be known.When grid-connected current is big, will inevitably cause the secondary ripple voltage also to exist than great fluctuation process.Introduce the grid-connected current feedfoward control for Boost voltage link and compensate the influence of grid-connected current busbar voltage.
5) the Boost voltage controller is exported as modulation signal, comparing with triangular carrier according to modulation signal obtains to be used to drive the drive signal of Boost circuit, suppresses purpose thereby reach the stable and secondary ripple voltage of finishing busbar voltage.Modulation signal is used to change the size of Boost contactor pipe T5 duty ratio, as being lower than set-point udc_ref as busbar voltage udc, then error signal is for just, then the modulation signal increase makes the increase of contactor pipe T5 duty ratio make udc raise, and makes busbar voltage remove tracing preset value udc_ref by a such feedback.Become big with exporting the grid-connected current instantaneous value, then busbar voltage udc can reduce, and then feedovering by power network current makes modulation signal increase, and realizes suppressing busbar voltage secondary ripple inhibition purpose thereby make the increase of switching tube duty ratio make udc raise.
, compare to shown in Figure 6 as Fig. 4 with the busbar voltage secondary ripple that does not have this invention, adopt inhibition method of the present invention after, the secondary ripple obviously reduces.
Certainly; the present invention can also have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (1)
1. the inhibition method of a photovoltaic combining inverter busbar voltage secondary ripple is characterized in that, this inhibition method comprises the steps:
1) the output voltage U pv and the output current Ipv of sampling photovoltaic battery panel send two parameters that obtain into the angle sin θ that obtains line voltage ugrid behind the MPPT controller after electrical network is phase-locked, and multiplying each other obtains grid-connected current command value amplitude iref;
2) grid-connected current command value iref, power network current value of feedback igrid and line voltage ugrid send into current controller together and obtain finishing inverter grid-connected current output algorithm;
3) command value of current controller output is sent into the PWM module, opening or turn-offing and realize grid-connected current is sent to the electrical network purpose by the control inverter switching tube;
4) the grid-connected current command value iref that obtains is sent into the Boost voltage controller, the Boost voltage controller is compared the busbar voltage udc that collects with set-point udc_ref, the error signal that obtains is obtained the error output signal through the PI controller, and error output signal and power network current feedforward addition obtain the output signal of Boost voltage controller;
5) the Boost voltage controller is exported as modulation signal, compare with triangular carrier according to modulation signal and to obtain to be used to drive the drive signal of Boost circuit, modulation signal is used to change the size of Boost contactor pipe T5 duty ratio, as being lower than set-point udc_ref as busbar voltage udc, then error signal is for just, then the modulation signal increase makes the increase of contactor pipe T5 duty ratio make udc raise, make busbar voltage udc remove tracing preset value udc_ref by a such feedback, when output grid-connected current instantaneous value becomes big, then busbar voltage udc can reduce, and then makes modulation signal increase by the power network current feedforward.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490653A (en) * | 2013-09-25 | 2014-01-01 | 国网河南省电力公司南阳供电公司 | Secondary ripple reduction control system and control method for photovoltaic grid-connected currents and direct current voltage |
| 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 |
| CN106505621A (en) * | 2016-11-28 | 2017-03-15 | 易事特集团股份有限公司 | Inverter and its control method and device |
| CN106899224A (en) * | 2017-05-03 | 2017-06-27 | 浙江埃菲生能源科技有限公司 | A kind of inverter Boost electric current loops vector auxiliary control method |
| CN110401346A (en) * | 2019-07-25 | 2019-11-01 | 合肥巨一动力系统有限公司 | Tandem type multiphase interleaving Boost control method |
| CN112838657A (en) * | 2021-01-28 | 2021-05-25 | 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 |
| CN116979608A (en) * | 2023-08-03 | 2023-10-31 | 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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| 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 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490653A (en) * | 2013-09-25 | 2014-01-01 | 国网河南省电力公司南阳供电公司 | Secondary ripple reduction control system and control method for photovoltaic grid-connected currents and direct current voltage |
| 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 |
| CN106505621A (en) * | 2016-11-28 | 2017-03-15 | 易事特集团股份有限公司 | Inverter and its control method and device |
| CN106899224A (en) * | 2017-05-03 | 2017-06-27 | 浙江埃菲生能源科技有限公司 | A kind of inverter Boost electric current loops vector auxiliary control method |
| 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 |
| CN110401346A (en) * | 2019-07-25 | 2019-11-01 | 合肥巨一动力系统有限公司 | Tandem type multiphase interleaving Boost 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 |
| CN112838657A (en) * | 2021-01-28 | 2021-05-25 | 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 |
| 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 |
| CN116979608A (en) * | 2023-08-03 | 2023-10-31 | 南通大学 | Overvoltage power limiting control method and system for photovoltaic grid-connected inverter |
| 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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