CN101860267B - Building method for photovoltaic power generation control system - Google Patents
Building method for photovoltaic power generation control system Download PDFInfo
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- CN101860267B CN101860267B CN2010101453956A CN201010145395A CN101860267B CN 101860267 B CN101860267 B CN 101860267B CN 2010101453956 A CN2010101453956 A CN 2010101453956A CN 201010145395 A CN201010145395 A CN 201010145395A CN 101860267 B CN101860267 B CN 101860267B
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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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
Abstract
The invention relates to a building method for a photovoltaic power generation control system, which is applicable to photovoltaic power generation, in particular to the field of analysis on the operating state and energy flow of a photovoltaic power generation system comprising an energy storage unit and an electrical energy transformation unit. The method mainly includes the following steps: defining the states of system parts, utilizing a stepped state association table to reduce the state scale, generating effective state links, then representing the state links in a code wheel coordinate system figure or a simple physical model, and meanwhile, establishing control schemes for corresponding states. The building method for the control system has the advantage that the building method can visually, accurately and comprehensively master the operating state of the system and realizes complete and reliable control.
Description
Technical field
A kind of construction method of photovoltaic power generation control system is applicable to photovoltaic generation, analyzes the operating state of photovoltaic generating system and the field of energy Flow when being specially adapted to comprise energy storage device, transformation of electrical energy device.
Background technology
In the modern power systems because being widely used and the structure of intelligent grid of the access of various generations of electricity by new energy, power electronic device; There are a large amount of converters and device in the electrical network; Energy Flow therebetween is very complicated with conversion, and system running state is very various.On top of the operating state of various parts is very difficult.And grasp the operating state that each installs, and consider the various operating conditions of electricity generation system as much as possible, different working modes adopts the control corresponding method, and is significant for the control precision and the reliability that improve grid-connected power generation system.Yet method commonly used at present is to enumerate out the various running statuses of system through the mode of enumerating or tabulate, so that implement concrete control; But this configuration process is complicated, and it is huge to tabulate, and omits some operating state easily; Make control precision not high, control method is complete inadequately.
As to photovoltaic parallel in system, when analyzing the running status of photovoltaic generating system, often only considered the part situation, and described complicated.Four kinds of operating states describing like document " research of grid-connected independently-powered dual-purpose inverter " and handoff procedure thereof, character property is described numerous and diverse, and inconvenience is understood and is formed the control corresponding scheme.Such as being described as of handoff procedure between relevant parallel network reverse and independent inversion " at first detection of grid voltage, battery tension and solar cell voltage behind the system boot; if line voltage is normal, and solar cell voltage is normal, and battery tension also is full; at this moment can generate electricity by way of merging two or more grid systems; inverter output voltage is supplied with electrical network and AC load, if this moment, electrical network broke down, then system can change independent inverter mode over to immediately after detecting electric network fault; continue powering load, play the effect of uninterrupted power supply.Behind power system restoration, continue again to generate electricity by way of merging two or more grid systems.", can't judge if voltage dip perhaps solar cell voltage undesired (not enough) according to this general description like sunlight; perhaps battery tension is discontented; or several kinds of situation are when having concurrently, and which kind of working method is system should turn to, and should adopt which kind of controlling schemes.Seven kinds of handoff procedures of five kinds of models in document " operation principle of parallel network power generation _ patent upright electric power system is probed into ", have been introduced; But still being not enough to contain the various mode of operations of overall optical photovoltaic generating system, researcher and operations staff also are difficult to the operating state of each several part in the grasp system comprehensively and take corresponding control measure.
Generally speaking, the weak point that exists in the existing photovoltaic generating system control procedure comprises that the operating state definition is unclear; And consider not comprehensive; Controlling schemes is single, is difficult to contain the complicated operating condition of photovoltaic generating system, is unfavorable for improving control precision and reliability.
Summary of the invention
The construction method that the purpose of this invention is to provide a kind of photovoltaic power generation control system, this method is convenient to the operating state of the system that grasps, and confirms rationally controlling schemes accurately, improves the control accuracy and the reliability of system.
For realizing the foregoing invention purpose; Technical scheme of the present invention is a kind of construction method of photovoltaic power generation control system, it is characterized in that: the photovoltaic generating system of this method comprises super capacitor and photovoltaic cell duplicate supply, two DC converter and three phase inverter bridge main circuit; After checkout gear detects the required electric current of photovoltaic generating system control, voltage parameter; Confirm the current state of photovoltaic generating system; From solution bank, extract controlling schemes according to the conditional code in the state repository; Send control signal according to this controlling schemes through controller then, two DC converters of unsteady flow parts in the photovoltaic generating system and three-phase inverter are implemented control, and then the compensation rate of output expectation;
This method is undertaken by following sequential steps:
(1) operating state of critical piece in the definition photovoltaic generating system
Critical piece comprises super capacitor, photovoltaic cell, electrical network, two DC converters (super capacitor discharges and recharges DC converter and maximum power of photovoltaic cell output DC converter) and three-phase inverter;
(2) utilize stairstepping state contingency table tentatively to obtain the feasible operating state of system
Unit status is shown in the stairstepping state contingency table, confirms the relation between each unit status, eliminate and can not and deposit or the state relation of contradiction, thus the Preliminary screening of the feasible state of realization system;
(3) utilize code wheel figure to represent the parts operating state
Utilize computer software Word to draw code wheel figure based on the code wheel coordinate system; The axial coordinate of code wheel coordinate system is represented photovoltaic cell in the photovoltaic generating system, super capacitor, electrical network, three-phase inverter and two DC converter, and the numeral number on its code wheel is represented the various operating states of a certain parts; Perhaps make easy code wheel in kind, the hand rotation code wheel is showed various states more intuitively;
(4) formation of photovoltaic generating system state
Each code wheel with part relation in the code wheel coordinate system rotates alone; Code wheel rotates each time and makes that one of total existence is parallel to axial line between each parts; The conditional code that is positioned on this line all can constitute a kind of new operating state, and judges the existence and the feasibility of this kind state; According to the primary election state of each parts in the step (2), rotate code wheel or change code wheel coordinate, produce a state chain that comprises each unit status, the conditional code of state chain is made up of the numeral number on the code wheel;
(5) formation of photovoltaic power generation control system
Repeated execution of steps (4) produces new operating state, and all the feasible states up to each parts of traversal obtain many bar states chain; For each bar state chain, set up the control corresponding scheme; Many bar states chain forms the state repository of photovoltaic generating system, and corresponding a plurality of controlling schemes form the control system of photovoltaic generation.
The present invention compared with prior art, technique effect is:
1, adopt stairstepping state contingency table, can be detailed and clearly list each parts operating state of photovoltaic generating system, be beneficial to the control precision and the reliability of raising system.Simultaneously according to containing between state or exclusion relations, reduced state scale greatly obtains the state chain of system.
2, utilize the code wheel coordinate diagram to show system and the residing operating state of parts thereof intuitively, for energy Flow situation and definite controlling schemes accurately of analytical system provide convenience in order.
3, utilize method of the present invention can realize the accurate definition of system mode, and eliminate and can not or do not hope the state that exists, and the malfunction that can the system of omitting not occur, realize that " seamless " control.
Description of drawings
Fig. 1 is the photovoltaic generating system control flow chart;
Fig. 2 is the enforcement illustration of photovoltaic generating system structure among Fig. 1;
Fig. 3 is the enforcement illustration of stairstepping attitude contingency table among Fig. 1;
Fig. 4 is the enforcement illustration of code wheel coordinate system among Fig. 1.
Among Fig. 2, PV represents photovoltaic cell, and SC represents super capacitor, and DC/DC1 represents the maximum power output DC converter of photovoltaic cell, and on behalf of super capacitor, DC/DC2 discharge and recharge DC converter, and DC/AC represents three-phase inverter, and Grid represents main electrical network;
Among Fig. 3 and Fig. 4, PV represents photovoltaic cell, and SC represents super capacitor, and GR represents main electrical network, and INV represents three-phase inverter, and DC/DC1 represents the maximum power output DC converter of photovoltaic cell, and on behalf of super capacitor, DC/DC2 discharge and recharge DC converter.
Embodiment
The present invention will combine accompanying drawing to do further explain.
Extremely shown in Figure 4 like Fig. 2:
1, the operating state of definition component
As shown in Figure 2, photovoltaic generating system comprises super capacitor (SC) and photovoltaic cell (PV) duplicate supply, electrical network (Grid), two DC converter (DC/DC1 and DC/DC2) and three-phase inverter (DC/AC) main circuit; The controlling schemes that makes up by the method for the invention is achieved in PVS (Photovoltaic System) unified controller.
Above-mentioned photovoltaic generating system energy Flow is complicated, and there is multiple operating state in each parts; The major part and the groundwork state thereof that influence system's operation define as follows:
Photovoltaic cell sunshine condition (three state): 1 weather is fine, the 2 weather rain of turning out cloudy, 3 nights;
Super capacitor energy-storage state (4 kinds of states): 1 charged state, 2 discharge conditions, 3 high charges, 4 minimum discharges;
Network operation state (three state): 1 voltage is normal, 2 voltage dips, 3 voltage swells;
Three-phase inverter (three state): 1 inversion, 2 rectifications, 3 lockings;
DC converter DC/DC1 (three state): 1 boosts, 2 step-downs, 3 lockings;
DC converter DC/DC2 (5 kinds of states): 1 forward boosts, 2 forward step-downs, and 3 oppositely boost, 4 reverse step-downs, 5 lockings;
2, utilize the feasible state of stairstepping state contingency table primary election system
Photovoltaic generating system comprises a plurality of functional components or parts (general designation parts); Every kind of parts all have multiple operating state; Be in a kind of operating state at certain (or time period) a kind of parts constantly; Operating state by each parts constitutes the whole system operation state jointly, is called a kind of state chain (State Link) of system, and system has the different state chain in the different moment or time period;
According to the method for exhaustion, the state chain of system reaches 3 * 4 * 3 * 3 * 3 * 5=1620 bar in theory, and promptly system possibly have 1620 kinds of operating states; Obviously enumeration method is very difficult, possibly realize the complete analysis of system hardly, also is difficult to eliminate wherein redundant state or actual infeasible state;
Form first row in the accompanying drawing 3 have comprised six chief components (parts) of photovoltaic generating system, and secondary series provides the code of the groundwork state of each parts, and wherein, PV represents photovoltaic cell; SC represents super capacitor; GR represents main electrical network; INV represents three-phase inverter; DC/DC1 represents the maximum power output DC converter of the photovoltaic cell of photovoltaic cell; On behalf of super capacitor, DC/DC2 discharge and recharge DC converter; The 3rd classifies the concrete state of each parts as, since the stairstepping contingency table of the 4th row for various states; Wherein, when indicating " * " in the cell, expression can not simultaneously and be deposited with the different conditions of a part (parts), does not also promptly have related question; When can not and depositing, exist contradiction between the two states of different parts or not hoping simultaneously and when depositing, the relating value of respective cells is " 0 ", otherwise is " 1 "; Such as overcast and rainy or night solar energy not enough or lack; When not hoping under such weather conditions to charge to super capacitor; The charged state SC1 of super capacitor is " 0 " with the state of weather PV2 and the related cell value of PV3 of photovoltaic cell; And when the fine state PV1 of weather, relating value is " 1 ", promptly is the super capacitor charging when weather is fine;
Only provide two inverted "L" shaped state relation examples in the form; Such as, concentrate for " L " shape attitude chain at super capacitor charged state SC1 place, traveled through the different conditions of each one; But some relating value is " 0 ", thereby in the state chain of this state chain subclass, gets rid of " 0 " state; Such as when super capacitor charges, there is not voltage dip to take place, three-phase inverter is not operated in inverter mode; But be super capacitor charging to AC rectification, DC converter DC/DC2 should make energy flow to super capacitor simultaneously; When charging for super capacitor; Obtain 1 * 1 * 2 * 2 * 3 * 2=24 bar state chain according to this inverted "L" shaped state chain subclass; 24 kinds of system modes when being the super capacitor charging; The state chain of getting rid of like this behind the association status not is the effective status chain, and is few more than several 1 * 3 * 3 * 3 * 3 * 5=405 bar state of the theory state that possibly occur chain; Utilize the state that the stairstepping contingency table can also evaluating system and influence the principal element of system;
3, form photovoltaic power generation control system according to code wheel figure
Utilize the code wheel coordinate system to represent each parts operating state; Its axial coordinate is represented photovoltaic cell in the photovoltaic generating system, super capacitor, electrical network, three-phase inverter and two DC converter, and the numeral number on its code wheel is represented the various operating states of a certain parts; Each code wheel in its code wheel coordinate system rotates alone; Or associated member rotates synchronously; Code wheel rotates each time and makes that one of total existence is parallel to axial line between each parts; The conditional code that is positioned on this line all can constitute a kind of new operating state, and judges the existence and the feasibility of this kind state;
Code wheel figure shown in Figure 4 has represented the code wheel coordinate system (CWS) about the photovoltaic generating system running status intuitively; Indicate various component names codes on the axle; Numeral number on the wheel is represented the state of each parts. utilize computer software Word to draw code wheel figure based on the code wheel coordinate system; And the numbering on the change code wheel, and then produce new operating state; When the simple and easy material object wheel of making shaft model, directly Status Name is write on the code wheel (status wheel); Rotate each code wheel and align vertically, align, promptly constitute a bar state chain 111234 like 1,1,1,2,3,4 of each wheel among the figure up to each code wheel coordinate; The system mode that this state-chain-table shows is that promptly weather is fine, the super capacitor charging; Line voltage is normal; Three-phase inverter is in rectification state, and DC converter DC/DC1 does not work, and it is the super capacitor charging that DC converter DC/DC2 takes alternating current step-down mode; Code wheel figure shown in Figure 4 with the code wheel of cardboard or other each parts of material, and writes the state of each one, is through jointly on the axle, can produce easy code wheel model, and is more directly perceived during the analytical system operating state;
Change code wheel coordinate as shown in Figure 4, all the feasible states up to each parts of traversal obtain many bar states chain, for each bar state chain, set up the control corresponding scheme; Many bar states chain forms the state repository of photovoltaic generating system, and corresponding a plurality of controlling schemes form the control system of photovoltaic generation.
Claims (1)
1. the construction method of a photovoltaic power generation control system is characterized in that the photovoltaic generating system of this method comprises super capacitor, photovoltaic cell, electrical network, two DC converter and three-phase inverter; After checkout gear detects photovoltaic generating system control required electric current and voltage parameter; Confirm the current state of photovoltaic generating system; From solution bank, extract controlling schemes according to the conditional code in the state repository; Send control signal according to this controlling schemes through controller then, two DC converters of the unsteady flow parts in the photovoltaic generating system and three-phase inverter are implemented control, and then the compensation rate of output expectation;
This method is carried out according to following sequential steps:
(1) operating state of critical piece in the definition photovoltaic generating system
Critical piece comprises super capacitor, photovoltaic cell, electrical network, two DC converter and three-phase inverter;
(2) utilize stairstepping state contingency table tentatively to obtain the feasible operating state of system
Unit status is shown in the stairstepping state contingency table, confirms the relation between each unit status, eliminate and can not and deposit or the state relation of contradiction, thus the Preliminary screening of the feasible state of realization system;
(3) utilize the code wheel coordinate system to represent the parts operating state
Utilize computer software Word to draw code wheel figure based on the code wheel coordinate system; The axial coordinate of code wheel coordinate system is represented photovoltaic cell in the photovoltaic generating system, super capacitor, electrical network, three-phase inverter and two DC converter, and the numeral number on its code wheel is represented the various operating states of a certain parts; Perhaps make easy code wheel in kind, the hand rotation code wheel is showed various states more intuitively;
(4) formation of photovoltaic generating system state
Each code wheel with part relation in the code wheel coordinate system rotates alone; Code wheel rotates each time and makes that one of total existence is parallel to axial line between each parts; The numeral number that is positioned on this line all can constitute a kind of new operating state, and judges the existence and the feasibility of this kind state; According to the primary election state of each parts in the step (2), rotate code wheel or change code wheel coordinate, produce a state chain that comprises each unit status, the conditional code of state chain is made up of the numeral number on each code wheel;
(5) formation of photovoltaic power generation control system
Repeated execution of steps (4) produces new operating state, and all the feasible states up to each parts of traversal obtain many bar states chain; For each bar state chain, set up the control corresponding scheme; Many bar states chain forms the state repository of photovoltaic generating system, and corresponding a plurality of controlling schemes form the control system of photovoltaic generation.
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| CN108400647A (en) * | 2018-05-14 | 2018-08-14 | 北方工业大学 | Solar power supply based on Internet photocatalyst fresh air system |
| CN111347926B (en) * | 2018-12-21 | 2022-04-15 | 比亚迪股份有限公司 | Power battery charging and discharging device, vehicle and heating device |
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| US4649334A (en) * | 1984-10-18 | 1987-03-10 | Kabushiki Kaisha Toshiba | Method of and system for controlling a photovoltaic power system |
| AU665468B2 (en) * | 1992-12-18 | 1996-01-04 | Emhart Glass S.A. | Glass container forming machine control |
| US7843085B2 (en) * | 2007-10-15 | 2010-11-30 | Ampt, Llc | Systems for highly efficient solar power |
| CN101309017B (en) * | 2008-07-11 | 2012-05-30 | 中国科学院电工研究所 | Wind power and photovoltaic power complementary power supply system based on mixed energy accumulation of super capacitor accumulator |
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