CN104615190B - The control method of MPPT optimizers in a kind of photovoltaic generating system - Google Patents

The control method of MPPT optimizers in a kind of photovoltaic generating system Download PDF

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CN104615190B
CN104615190B CN201510080899.7A CN201510080899A CN104615190B CN 104615190 B CN104615190 B CN 104615190B CN 201510080899 A CN201510080899 A CN 201510080899A CN 104615190 B CN104615190 B CN 104615190B
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mppt
optimizers
switching frequency
generating system
photovoltaic generating
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CN104615190A (en
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罗劼
葛鹏霄
鹿明星
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Sineng Electric Co Ltd
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Sineng Electric Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

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  • Dc-Dc Converters (AREA)

Abstract

The present invention discloses a kind of control method of MPPT optimizers in photovoltaic generating system, and the method is according to the working condition of photovoltaic generating system, the switching frequency of real-time adjustment MPPT optimizers, to realize the maximization of system effectiveness.The present invention is simple and easy to apply, can to a certain extent lift photovoltaic generating system generated energy, lifts the gene-ration revenue of photovoltaic system.

Description

The control method of MPPT optimizers in a kind of photovoltaic generating system
Technical field
The present invention relates to a kind of control of MPPT optimizers in technical field of photovoltaic power generation, more particularly to photovoltaic generating system Method.
Background technology
Large-scale ground photovoltaic plant is typically confluxed using header box, centralized photovoltaic inverter grid-connected.Existing photovoltaic electric Pond plate operating voltage is generally 500-700V, and with external environment, such as change of environment temperature, irradiation level, photovoltaic cell The voltage of plate can be in interior fluctuation on a large scale.To realize DC voltage higher, maximum work can be carried out with photovoltaic submatrix cell distribution The mode of rate point tracking (MPPT) optimization, that is, install MPPT optimizers additional.MPPT optimizers can be separately positioned at battery pack string side, Can also be integrated with header box, form so-called intelligent junction box.Photovoltaic is installed additional by centralized inverter front end The MPPT optimizers of submatrix unit, on the one hand can reduce the MPPT match penalties of photovoltaic module, on the other hand can also improve The output characteristics of photovoltaic battery panel.MPPT optimizers generally can rise high voltage using Boost circuit, and circuit topology is as schemed Shown in 1.Existing control mode typically all uses pulse width modulation (PWM) control mode, and switching frequency is constant.When load compared with When low, or input voltage and output voltage difference it is smaller when, inductive current ripple can be smaller, the iron loss of inductor also compared with It is small, but, now switching device works also according to original frequency, and switching loss is basically unchanged.Under this operating mode, use Surely work is unfavorable for the lifting of conversion efficiency to PWM frequently.
The content of the invention
It is an object of the invention to by a kind of control method of MPPT optimizers in photovoltaic generating system come more than solving The problem that background section is mentioned.
It is that, up to this purpose, the present invention uses following technical scheme:
The control method of MPPT optimizers in a kind of photovoltaic generating system, it includes:According to the work of photovoltaic generating system State, according to the switching frequency of predeterminated frequency regulative mode real-time adjustment MPPT optimizers.
Especially, the predeterminated frequency regulative mode is specifically included:The switching frequency of MPPT optimizers is with PWM duty cycle Change and change, when PWM duty cycle is more than preset value, the switching frequency of MPPT optimizers keeps default maximum switching frequency value It is constant, when PWM duty cycle be less than preset value when, the switching frequency of MPPT optimizers with certain amplitude linear reduction, until reaching During lower frequency limit, keep constant.
Especially, the predeterminated frequency regulative mode is specifically included:When PWM duty cycle is more than 0.2, MPPT optimizers Switching frequency keeps 16KHZ constant, and when PWM duty cycle is less than 0.2, the switching frequency of MPPT optimizers is linear with certain amplitude Reduce, until when reaching 4KHZ, keeping constant.
Work of the control method of MPPT optimizers according to photovoltaic generating system in photovoltaic generating system proposed by the present invention State, the switching frequency of real-time adjustment MPPT optimizers is simple and easy to apply to realize the maximization of system effectiveness, can be certain Photovoltaic generating system generated energy is lifted in degree, the gene-ration revenue of photovoltaic system is lifted.
Brief description of the drawings
Fig. 1 is MPPT optimizers circuit topology schematic diagram provided in an embodiment of the present invention;
Fig. 2 is the function relation figure of switching frequency provided in an embodiment of the present invention and PWM duty cycle.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.It is understood that tool described herein Body embodiment is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that, for the ease of retouching State, part rather than full content related to the present invention is illustrate only in accompanying drawing, it is unless otherwise defined, used herein all Technology and scientific terminology are identical with the implication that those skilled in the art of the invention are generally understood that is belonged to.It is used herein Term be intended merely to describe specific embodiment, it is not intended that in limitation the present invention.
The control method of MPPT optimizers is specifically included in photovoltaic generating system in the present embodiment:According to photovoltaic generating system Working condition, according to the switching frequency of predeterminated frequency regulative mode real-time adjustment MPPT optimizers.
For photovoltaic generating system, improving conversion efficiency means more generated energy, it may be considered that in some operating modes Decline low switching frequency, reduce switching loss.The reduction of switching frequency, can cause inductance ripple current to increase, and iron loss increases.But Boost circuit operative duty cycles are smaller, and inductance ripple current is smaller.Switching frequency can be now reduced, it is appropriate to increase electricity Sense iron loss, exchanges the significantly reduction of switching loss for, improves the transformation efficiency of converter.
It is optimal as principle with photovoltaic generating system gross efficiency, determine the mode of frequency conversion and the scope of frequency conversion.MPPT optimizes The switching frequency of device determines frequency work with PWM duty cycle as variable change during higher than certain dutycycle, dutycycle is less than certain value When, working frequency reduction, dutycycle is smaller, and working frequency is lower.
Predeterminated frequency regulative mode is specifically included described in the present embodiment:The switching frequency of MPPT optimizers is accounted for PWM The change of empty ratio and change, when PWM duty cycle is more than preset value, the switching frequency of MPPT optimizers keeps default maximum switch Frequency values are constant, when PWM duty cycle is less than preset value, the switching frequency of MPPT optimizers with certain amplitude linear reduction, directly When lower frequency limit is reached, keep constant.Specifically, as shown in Fig. 2 when PWM duty cycle be more than 0.2 when, MPPT optimizers Switching frequency keeps 16KHZ constant, and when PWM duty cycle is less than 0.2, the switching frequency of MPPT optimizers is linear with certain amplitude Reduce, until when reaching 4KHZ, keeping constant.
, according to the working condition of photovoltaic generating system, the switch of real-time adjustment MPPT optimizers is frequently for technical scheme Rate, it is simple and easy to apply to realize the maximization of system effectiveness, photovoltaic generating system generated energy can be to a certain extent lifted, carry Rise the gene-ration revenue of photovoltaic system.
The preferred embodiments of the present invention are the foregoing is only, is not intended to limit the invention, for those skilled in the art For, the present invention can have various changes and change.It is all any modifications made within spirit and principles of the present invention, equivalent Replace, improve etc., should be included within the scope of the present invention.

Claims (1)

1. in a kind of photovoltaic generating system MPPT optimizers control method, it is characterised in that including:According to photovoltaic generating system Working condition, according to the switching frequency of predeterminated frequency regulative mode real-time adjustment MPPT optimizers;Wherein, the predeterminated frequency Regulative mode is specifically included:The switching frequency of MPPT optimizers changes with the change of PWM duty cycle, when PWM duty cycle is more than During preset value, the switching frequency of MPPT optimizers keeps default maximum switching frequency value constant, when PWM duty cycle is less than preset value When, the switching frequency of MPPT optimizers is with certain amplitude linear reduction, until when reaching lower frequency limit, keeping constant, specifically: When PWM duty cycle is more than 0.2, the switching frequency of MPPT optimizers keeps 16KHZ constant, when PWM duty cycle is less than 0.2, The switching frequency of MPPT optimizers is with certain amplitude linear reduction, until when reaching 4KHZ, keeping constant.
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CN110098635B (en) * 2019-04-17 2022-06-28 华为数字能源技术有限公司 Photovoltaic inverter and corresponding switching frequency control method
CN112821754B (en) * 2020-12-31 2023-01-06 深圳市禾望科技有限公司 Photovoltaic power generation system and control method thereof

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CN101236446A (en) * 2008-02-28 2008-08-06 上海交通大学 Voltage-variable photovoltaic system maximal power tracing control method adapting to weather status
CN102403928A (en) * 2010-12-27 2012-04-04 董密 Maximum power point tracking control method and system thereof of photovoltaic electrical energy optimization
CN202334369U (en) * 2010-12-27 2012-07-11 董密 Photovoltaic electrical energy optimizer
US20120223583A1 (en) * 2011-03-03 2012-09-06 Massachusetts Institute Of Technology Photovoltaic energy extraction with multilevel output dc-dc switched capacitor converters
CN103095164A (en) * 2012-03-14 2013-05-08 新豪博业科技江苏有限公司 Novel photovoltaic micro inverter control method
CN103117557A (en) * 2013-03-06 2013-05-22 东南大学 Grid-connected current control method for combined single-phase two-stage photovoltaic generation system
CN103226374A (en) * 2013-04-25 2013-07-31 南京邮电大学 Maximum power point tracking circuit of constant flow source control photovoltaic panel

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101236446A (en) * 2008-02-28 2008-08-06 上海交通大学 Voltage-variable photovoltaic system maximal power tracing control method adapting to weather status
CN102403928A (en) * 2010-12-27 2012-04-04 董密 Maximum power point tracking control method and system thereof of photovoltaic electrical energy optimization
CN202334369U (en) * 2010-12-27 2012-07-11 董密 Photovoltaic electrical energy optimizer
US20120223583A1 (en) * 2011-03-03 2012-09-06 Massachusetts Institute Of Technology Photovoltaic energy extraction with multilevel output dc-dc switched capacitor converters
CN103095164A (en) * 2012-03-14 2013-05-08 新豪博业科技江苏有限公司 Novel photovoltaic micro inverter control method
CN103117557A (en) * 2013-03-06 2013-05-22 东南大学 Grid-connected current control method for combined single-phase two-stage photovoltaic generation system
CN103226374A (en) * 2013-04-25 2013-07-31 南京邮电大学 Maximum power point tracking circuit of constant flow source control photovoltaic panel

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