CN104348186A - Novel controller for single-stage three-phase photovoltaic grid-connected inverter - Google Patents
Novel controller for single-stage three-phase photovoltaic grid-connected inverter Download PDFInfo
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- CN104348186A CN104348186A CN201410591863.0A CN201410591863A CN104348186A CN 104348186 A CN104348186 A CN 104348186A CN 201410591863 A CN201410591863 A CN 201410591863A CN 104348186 A CN104348186 A CN 104348186A
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Classifications
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- H02J3/385—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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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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- Engineering & Computer Science (AREA)
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Abstract
The invention provides a novel controller for a single-stage three-phase photovoltaic grid-connected inverter, which can simultaneously realizethe grid-connected control and the track for the maximum power point of a photovoltaic array. The novel controller comprises a photovoltaic control module, a space vector pulse width modulation module and a passive power controller, wherein the photovoltaic control module is connected with an inverter and the passive power controller is connected with the photovoltaic control module and the space vector pulse width modulation module. The novel controller for the single-stage three-phase photovoltaic grid-connected inverter provided by the invention can simultaneously realize the functions of grid-connected control and track for the maximum power point of the photovoltaic array; a passive nonlinear control strategy is adopted by a photovoltaic grid-connected inverter, so that the inverter has the advantages of simple algorithm design, few adjustable parameters, strong robustness, and the like; a variable-step conductive increment algorithm based on power control is adopted by the photovoltaic array, so that the track for the maximum power point is realized; the novel controller has the advantages of simple analysis process, convenience in realization and capability of simultaneously considering the demands on response speed, track precision, stability of direct current bus capacitor voltage, and the like.
Description
Technical field
The present invention relates to a kind of circuit control device, especially a kind of new controller for monopole three-phase photovoltaic grid-connected inverter.
Background technology
Solar energy resources is abundant, widely distributed, is the most potential regenerative resource.Along with global energy shortage and the problem such as environmental pollution become increasingly conspicuous, solar energy power generating because of its clean, safety, facility, the feature such as efficient, the new industry having become countries in the world common concern and given priority to.In this context, the key technology studying grid-connected photovoltaic system has important practical significance for the application of solar energy power generating and development.
Photovoltaic combining inverter converts the direct current that photovoltaic array exports to equipment that the alternating current meeting grid requirements inputs electrical network again, it is the core of power conversion and control in grid-connected photovoltaic system, whether its performance excellent not only affects and decide whole system can stablize, safe, reliable, efficient to run, and is the principal element affecting whole system useful life.Most photovoltaic combining inverter all adopts Voltage Source PWM Inverter topological structure, and this structure has the advantages such as power factor is controlled, current on line side sinusoidalization.Therefore, when topological structure is certain, the performance of photovoltaic combining inverter depends on control strategy.Domestic existing comparatively ripe control strategy has digital IIR filters, Sliding mode variable structure control, fuzzy control, Repetitive controller, track with zero error etc., and meanwhile, external scholar also has the research to additive method.Now, for the typical non linear system that photovoltaic combining inverter is a multivariable, close coupling, emerge again both at home and abroad some comparatively effective non-linear control strategies, such as modified feedback linearization control, control, Active Disturbance Rejection Control, Passive Shape Control etc. based on Lyapunov Theory of Stability.
Simultaneously, for grid-connected photovoltaic system, due to environment as intensity of illumination, cell panel temperature etc. often change in time, result in photovoltaic array can not continuous firing in maximum power point place, then reduce the energy conversion efficiency of grid-connected photovoltaic system, decrease the electric energy that photovoltaic array injects to electrical network or load.Therefore, for adapting to the change of surrounding enviroment, obtaining the peak power output of photovoltaic array, improving the utilance of photovoltaic array, need the research carried out MPPT technology.At present, the control technology research of MPPT has achieved a lot of achievements, propose multiple MPPT method both at home and abroad, mainly comprise constant voltage process, open circuit voltage method, short circuit current method, power back coupling method, disturbance observation, conductance increment method, duty ratio method of perturbation, center of gravity comparison method, optimum gradient method, intermittent scanning tracing, power mathematical model method, actual measurement method, fuzzy logic method, neural network prediction methods etc. at 3.Wherein, the algorithm of comparative maturity has constant voltage process, disturbance observation and conductance increment method.For the deficiency of these three kinds of algorithms, many scholars propose corresponding innovatory algorithm again in succession, comprise constant voltage process to start and start in conjunction with the conductance increment method of variable step, constant voltage process in conjunction with conductance increment method etc. in conjunction with the disturbance observation of variable step, constant voltage process, its basic thought is all using the open circuit voltage of 0.78 times as voltage initial baseline value, controlling output voltage moves near maximum power point voltage, then variable step or little step length algorithm is started, namely when distance maximum power point is distant, step-length is got comparatively large, and tracking velocity is accelerated; When distance maximum power point is closer, step-length is got less, prevents the oscillatory occurences near maximum power point.
Summary of the invention
The invention provides and a kind ofly can realize the tracking of maximum power point of photovoltaic array and the new controller for monopole three-phase photovoltaic grid-connected inverter of cutting-in control simultaneously.
Realize a kind of new controller for monopole three-phase photovoltaic grid-connected inverter of the object of the invention, comprise the photovoltaic control module and space vector pulse width modulation module that are connected with inverter, the Passive Power controller that described photovoltaic control module is connected with space vector pulse width modulation module.
The beneficial effect of a kind of new controller for monopole three-phase photovoltaic grid-connected inverter of the present invention is as follows:
A kind of new controller for monopole three-phase photovoltaic grid-connected inverter of the present invention, can realize the function such as tracking and cutting-in control of maximum power point of photovoltaic array simultaneously; Photovoltaic combining inverter adopts Passive Nonlinear control strategy, has the advantages such as algorithm design is simple, adjustable parameter is few, strong robustness; Photovoltaic array adopts the tracking of the variable step conductance increment algorithm realization maximum power point controlled based on power, has analytic process simple, and it is convenient to realize, and can take into account the requirements such as the stability of response speed, tracking accuracy and dc-link capacitance voltage simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of new controller for monopole three-phase photovoltaic grid-connected inverter of the present invention.
Embodiment
As shown in Figure 1, a kind of new controller for monopole three-phase photovoltaic grid-connected inverter of the present invention, comprise the photovoltaic control module 2 and space vector pulse width modulation module 3 that are connected with inverter 1, the Passive Power controller 4 that described photovoltaic control module 2 is connected with space vector pulse width modulation module 3.
The advantage of a kind of new controller for monopole three-phase photovoltaic grid-connected inverter of the present invention is as follows:
The present invention is directed to the non-linear of photovoltaic combining inverter Mathematical Modeling and passivity, based on the Passive Nonlinear control theory of energy hole thought as the control strategy of inverter, respectively uneoupled control is carried out, to meet the control overflow such as unity power factor, output current sine degree to the active power exported and reactive power.This control strategy has the advantages such as algorithm design is simple, adjustable parameter is few, strong robustness.Simultaneously, for realizing the MPPT maximum power point tracking of photovoltaic array, by the comparative analysis to existing MPPT algorithm, the present invention proposes a kind of variable step conductance increment algorithm controlled based on power, the power output of the direct selective light photovoltaic array of this algorithm is as controlled quentity controlled variable, during judgement, no matter photovoltaic array is operated in which side of maximum power point, and its change direction always increases or remains unchanged.This Algorithm Analysis process is simple, and it is convenient to realize, and can take into account the requirements such as the stability of response speed, tracking accuracy and dc-link capacitance voltage simultaneously.
Embodiment recited above is only be described the preferred embodiment of the present invention; not scope of the present invention is limited; do not departing under the present invention designs spiritual prerequisite; the various distortion that the common engineers and technicians in this area make technical solution of the present invention and improvement, all should fall in protection range that claims of the present invention determine.
Claims (1)
1. the new controller for monopole three-phase photovoltaic grid-connected inverter, it is characterized in that: comprise the photovoltaic control module and space vector pulse width modulation module that are connected with inverter, the Passive Power controller that described photovoltaic control module is connected with space vector pulse width modulation module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410591863.0A CN104348186A (en) | 2014-10-29 | 2014-10-29 | Novel controller for single-stage three-phase photovoltaic grid-connected inverter |
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| CN201410591863.0A CN104348186A (en) | 2014-10-29 | 2014-10-29 | Novel controller for single-stage three-phase photovoltaic grid-connected inverter |
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| CN104348186A true CN104348186A (en) | 2015-02-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106292828A (en) * | 2016-08-30 | 2017-01-04 | 天津理工大学 | A kind of photovoltaic system maximum power point tracking device and control method |
| CN106532744A (en) * | 2016-12-01 | 2017-03-22 | 华北电力大学（保定） | Photovoltaic power station low-frequency oscillation suppression method based on active disturbance rejection control |
| CN107850914A (en) * | 2015-09-09 | 2018-03-27 | 株式会社日立产机系统 | The control method of power governor and power governor |
-
2014
- 2014-10-29 CN CN201410591863.0A patent/CN104348186A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107850914A (en) * | 2015-09-09 | 2018-03-27 | 株式会社日立产机系统 | The control method of power governor and power governor |
| CN107850914B (en) * | 2015-09-09 | 2020-04-24 | 株式会社日立产机系统 | Power regulator and control method of power regulator |
| CN106292828A (en) * | 2016-08-30 | 2017-01-04 | 天津理工大学 | A kind of photovoltaic system maximum power point tracking device and control method |
| CN106532744A (en) * | 2016-12-01 | 2017-03-22 | 华北电力大学（保定） | Photovoltaic power station low-frequency oscillation suppression method based on active disturbance rejection control |
| CN106532744B (en) * | 2016-12-01 | 2019-04-02 | 华北电力大学（保定） | A method of the photovoltaic plant based on Active Disturbance Rejection Control inhibits electricity grid oscillating |
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