CN104333316A - Boost control method for off-grid type distributed photovoltaic generating - Google Patents
Boost control method for off-grid type distributed photovoltaic generating Download PDFInfo
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- CN104333316A CN104333316A CN201410493487.1A CN201410493487A CN104333316A CN 104333316 A CN104333316 A CN 104333316A CN 201410493487 A CN201410493487 A CN 201410493487A CN 104333316 A CN104333316 A CN 104333316A
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- battery panel
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- photovoltaic battery
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000010248 power generation Methods 0.000 claims abstract description 17
- 238000004146 energy storage Methods 0.000 abstract description 6
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- 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)
- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention discloses a Boost control method for off-grid type distributed photovoltaic generating. The control method involves determining the size of current photovoltaic output power through detecting the voltage of the output end of a photovoltaic power generation system so as to determine whether to employ maximum power point tracking control or direct power control for a photovoltaic battery, and finally controlling the change trend of the photovoltaic output power by controlling the duty ratio of a Boost circuit. After the photovoltaic power generation system employs the control method provided by the invention, the change of an electric power load can be rapidly and effectively tracked, proper power is output automatically and adaptively, the capacity of an energy storage unit can be substantially reduced, and the engineering investment is decreased.
Description
Technical field
The invention belongs to DC/DC and convert Boost circuit technical field, particularly relate to a kind of for the Boost boost control method from net type distributed photovoltaic power generation.
Background technology
Parallel network power generation starts from the beginning of the eighties, and due to the plurality of advantages of solar energy power generating, its research and development, industrialized manufacture technology and market development have become the focus of world competition.Control method at present for photovoltaic generation power output is mainly maximum power point tracking (Maximum Power Point Tracking is called for short MPPT) method, and this MPPT method mainly contains three kinds: 1) constant voltage control methods; 2) disturbance observation method; 3) incremental conductance method.The core of these methods is all the generating voltage by detecting real-time photovoltaic battery panel, and follow the trail of ceiling voltage current value (VI), make system with maximum power output, be widely used in solar energy photovoltaic system, to coordinate the work of photovoltaic battery panel, energy-storage units, load.
Therefore, MPPT maximum power point tracking MPPT system is a kind of by regulating the operating state of electrical module, enable photovoltaic panel export the electrical system of more electric energy, its direct current that solar panel can be sent is stored in storage battery effectively or supply load uses.From in net type distributed photovoltaic power generation system, energy-storage units is an indispensable part always, play the function stabilized voltage fluctuation, maintain short-time rating balance, but energy-storage units extravagent price draws high the construction cost from net type photovoltaic generating system.
Summary of the invention
In order to solve the problem, the object of the present invention is to provide a kind of for the Boost boost control method from net type distributed photovoltaic power generation.
In order to achieve the above object, provided by the inventionly comprise for the Boost boost control method from net type distributed photovoltaic power generation the following step performed in order:
Step 1) first detect virtual voltage u from net type photovoltaic generating system AC, and calculate virtual voltage u and predeterminated voltage u
0difference △ u;
Step 2) judge that whether virtual voltage is equal with predeterminated voltage, namely judge whether difference △ u is zero; If judged result is "Yes", then this method so far terminates, otherwise next step enters step 3);
Step 3) judge whether above-mentioned difference △ u is greater than zero, if judged result is "No", then enters step 4), if judged result is "Yes", then next step enters step 8);
Step 4) increase the power output of photovoltaic generating system, and judge whether current photovoltaic battery panel operates in maximum power point place, if judged result is "Yes", then without the need to adjustment, this method so far terminates; Otherwise next step enters step 5);
Step 5) conveniently MPPT algorithm control, to increase its power stage, then judge that whether the operating point of photovoltaic battery panel is in the left side of output characteristic curve MPPT point, if judged result is "Yes", then enter step 6), otherwise next step enters step 7);
Step 6) reduce the duty ratio D of Boost circuit, to increase its power stage; This method so far terminates;
Step 7) increase the duty ratio D of Boost circuit, to increase its power stage; This method so far terminates;
Step 8) reduce the power output of photovoltaic generating system, and judge that whether the operating point of photovoltaic battery panel is in the left side of output characteristic curve MPPT point, if judged result is "Yes", then enter step 9), if judged result is on MPPT point or on the right side of MPPT point, then next step enters step 10);
Step 9) increase the duty ratio D of Boost circuit, to reduce the port voltage of photovoltaic battery panel; This method so far terminates;
Step 10) reduce the duty ratio D of Boost circuit, to increase the port voltage of photovoltaic battery panel, thus the power output of photovoltaic battery panel is reduced; This method so far terminates.
In step 4) in, the judgment formula of described maximum power point is:
Wherein: U2, I2 are photovoltaic battery panel port voltage and electric current in this computing cycle, dI is the difference of photovoltaic battery panel port current I2 in photovoltaic battery panel port current I1 and this computing cycle in a upper computing cycle; DU is the difference of photovoltaic battery panel port voltage U2 in photovoltaic battery panel port voltage U1 and this computing cycle in a upper computing cycle.
In step 5) and step 8) in, whether the described operating point judging photovoltaic battery panel at the formula in output characteristic curve MPPT point left side is:
Wherein: U2, I2 are photovoltaic battery panel port voltage and electric current in this computing cycle, dI is the difference of photovoltaic battery panel port current I2 in photovoltaic battery panel port current I1 and this computing cycle in a upper computing cycle; DU is the difference of photovoltaic battery panel port voltage U2 in photovoltaic battery panel port voltage U1 and this computing cycle in a upper computing cycle.
Effect for the Boost boost control method from net type distributed photovoltaic power generation provided by the invention: by judging the size of current photovoltaic power output to the detection of photovoltaic generating system output end voltage, thus judge to adopt maximum power point tracking to photovoltaic cell or adopt direct Power Control, the final duty ratio controlling Boost circuit that utilizes is to reach the control to photovoltaic power output tendency of changes.After photovoltaic generating system adopts this control method, effectively can follow the tracks of the change of electrical load fast, automatically adapt to export suitable power, thus significantly can save the capacity of energy-storage units, reduce construction investment.
Accompanying drawing explanation
Fig. 1 is the output characteristic curve figure of photovoltaic cell;
Fig. 2 is the illustraton of model from net type photovoltaic generating system;
Fig. 3 is provided by the invention for the Boost boost control method flow chart from net type distributed photovoltaic power generation.
Embodiment
Be described in detail for the Boost boost control method from net type distributed photovoltaic power generation to provided by the invention below in conjunction with the drawings and specific embodiments.
Fig. 1 shows the output characteristic curve based on photovoltaic cell, can see, the electric current that photovoltaic cell exports is the variation tendency of non-linear reduction with the increase of port voltage.MPPT point on this output characteristic curve be photovoltaic cell output voltage and amp product maximum a bit, be the maximum power point of photovoltaic cell.As can be seen from Figure 1, when the port voltage of photovoltaic cell changes, its power output also can change.This method reaches by changing photovoltaic cell port voltage the object controlling power output; The present invention relates to from net type photovoltaic power generation system model as shown in Figure 2;
As shown in Figure 3, provided by the inventionly comprise from net type distributed photovoltaic power generation system power control method the following step performed in order based on Boost circuit:
Step 1) first detect virtual voltage u from net type photovoltaic generating system AC, and calculate virtual voltage u and predeterminated voltage u
0difference △ u;
Step 2) judge that whether virtual voltage is equal with predeterminated voltage, namely judge whether difference △ u is zero; If judged result is "Yes", then this method so far terminates, otherwise next step enters step 3);
Step 3) judge whether above-mentioned difference △ u is greater than zero, if judged result is "No", then enters step 4), if judged result is "Yes", then next step enters step 8);
Step 4) increase the power output of photovoltaic generating system, and judge whether current photovoltaic battery panel operates in maximum power point place, if judged result is "Yes", then without the need to adjustment, this method so far terminates; Otherwise next step enters step 5);
Step 5) conveniently MPPT algorithm control, to increase its power stage, then judge that whether the operating point of photovoltaic battery panel is in the left side of output characteristic curve MPPT point, if judged result is "Yes", then enter step 6), otherwise next step enters step 7);
Step 6) reduce the duty ratio D of Boost circuit, to increase its power stage; This method so far terminates;
Step 7) increase the duty ratio D of Boost circuit, to increase its power stage; This method so far terminates;
Step 8) reduce the power output of photovoltaic generating system, and judge that whether the operating point of photovoltaic battery panel is in the left side of output characteristic curve MPPT point, if judged result is "Yes", then enter step 9), if judged result is on MPPT point or on the right side of MPPT point, then next step enters step 10);
Step 9) increase the duty ratio D of Boost circuit, to reduce the port voltage of photovoltaic battery panel; This method so far terminates;
Step 10) reduce the duty ratio D of Boost circuit, to increase the port voltage of photovoltaic battery panel, thus the power output of photovoltaic battery panel is reduced; This method so far terminates.
In step 4) in, the judgment formula of described maximum power point is:
Wherein: U2, I2 are photovoltaic battery panel port voltage and electric current in this computing cycle, dI is the difference of photovoltaic battery panel port current I2 in photovoltaic battery panel port current I1 and this computing cycle in a upper computing cycle; DU is the difference of photovoltaic battery panel port voltage U2 in photovoltaic battery panel port voltage U1 and this computing cycle in a upper computing cycle.
In step 5) and step 8) in, whether the described operating point judging photovoltaic battery panel at the formula in output characteristic curve MPPT point left side is:
Wherein: U2, I2 are photovoltaic battery panel port voltage and electric current in this computing cycle, dI is the difference of photovoltaic battery panel port current I2 in photovoltaic battery panel port current I1 and this computing cycle in a upper computing cycle; DU is the difference of photovoltaic battery panel port voltage U2 in photovoltaic battery panel port voltage U1 and this computing cycle in a upper computing cycle.
Provided by the invention have following features based on Boost circuit from net type distributed photovoltaic power generation system power control method:
(1) without the need to changing the hardware configuration of existing photovoltaic generating system, only making a change in control method, making method proposed by the invention have wider applicability.
(2) control to be utilize himself characteristic to the power of photovoltaic generating system, but not rely on the control to inverter, thus the control strategy of inverter can be simplified, simpler on control principle.
(3) power controls is no longer merely maximum power point tracking, but the Tracing Control to bearing power, thus the change of bearing power can be adapted to fast, no longer need large-scale energy-storage units to carry out stabilizing power.
Claims (3)
1. for the Boost boost control method from net type distributed photovoltaic power generation, it is characterized in that: it comprises the following step performed in order:
Step 1) first detect virtual voltage u from net type photovoltaic generating system AC, and calculate virtual voltage u and predeterminated voltage u
0difference △ u;
Step 2) judge that whether virtual voltage is equal with predeterminated voltage, namely judge whether difference △ u is zero; If judged result is "Yes", then this method so far terminates, otherwise next step enters step 3);
Step 3) judge whether above-mentioned difference △ u is greater than zero, if judged result is "No", then enters step 4), if judged result is "Yes", then next step enters step 8);
Step 4) increase the power output of photovoltaic generating system, and judge whether current photovoltaic battery panel operates in maximum power point place, if judged result is "Yes", then without the need to adjustment, this method so far terminates; Otherwise next step enters step 5);
Step 5) conveniently MPPT algorithm control, to increase its power stage, then judge that whether the operating point of photovoltaic battery panel is in the left side of output characteristic curve MPPT point, if judged result is "Yes", then enter step 6), otherwise next step enters step 7);
Step 6) reduce the duty ratio D of Boost circuit, to increase its power stage; This method so far terminates;
Step 7) increase the duty ratio D of Boost circuit, to increase its power stage; This method so far terminates;
Step 8) reduce the power output of photovoltaic generating system, and judge that whether the operating point of photovoltaic battery panel is in the left side of output characteristic curve MPPT point, if judged result is "Yes", then enter step 9), if judged result is on MPPT point or on the right side of MPPT point, then next step enters step 10);
Step 9) increase the duty ratio D of Boost circuit, to reduce the port voltage of photovoltaic battery panel; This method so far terminates;
Step 10) reduce the duty ratio D of Boost circuit, to increase the port voltage of photovoltaic battery panel, thus the power output of photovoltaic battery panel is reduced; This method so far terminates.
2. according to claim 1 for the Boost boost control method from net type distributed photovoltaic power generation, it is characterized in that: in step 4) in, the judgment formula of described maximum power point is:
Wherein: U2, I2 are photovoltaic battery panel port voltage and electric current in this computing cycle, dI is the difference of photovoltaic battery panel port current I2 in photovoltaic battery panel port current I1 and this computing cycle in a upper computing cycle; DU is the difference of photovoltaic battery panel port voltage U2 in photovoltaic battery panel port voltage U1 and this computing cycle in a upper computing cycle.
3. according to claim 1 for the Boost boost control method from net type distributed photovoltaic power generation, it is characterized in that: in step 5) and step 8) in, whether the described operating point judging photovoltaic battery panel at the formula in output characteristic curve MPPT point left side is:
Wherein: U2, I2 are photovoltaic battery panel port voltage and electric current in this computing cycle, dI is the difference of photovoltaic battery panel port current I2 in photovoltaic battery panel port current I1 and this computing cycle in a upper computing cycle; DU is the difference of photovoltaic battery panel port voltage U2 in photovoltaic battery panel port voltage U1 and this computing cycle in a upper computing cycle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410493487.1A CN104333316A (en) | 2014-09-24 | 2014-09-24 | Boost control method for off-grid type distributed photovoltaic generating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105870964A (en) * | 2016-03-31 | 2016-08-17 | 国网天津市电力公司 | Microgrid-based distributed photovoltaic power generation boost (Boost) control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1731651A (en) * | 2005-08-26 | 2006-02-08 | 清华大学 | Maximum-power-point-tracking method for separate controlled photovoltaic system |
| US20130234516A1 (en) * | 2012-03-09 | 2013-09-12 | Panasonic Corporation | Electricity generation controller, electricity generation control system, and electricity generation control method |
| CN103472886A (en) * | 2013-08-30 | 2013-12-25 | 浙江大学 | MPPT (maximum power point tracking) control method and MPPT control circuit used for distributed photovoltaic array |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1731651A (en) * | 2005-08-26 | 2006-02-08 | 清华大学 | Maximum-power-point-tracking method for separate controlled photovoltaic system |
| US20130234516A1 (en) * | 2012-03-09 | 2013-09-12 | Panasonic Corporation | Electricity generation controller, electricity generation control system, and electricity generation control method |
| CN103472886A (en) * | 2013-08-30 | 2013-12-25 | 浙江大学 | MPPT (maximum power point tracking) control method and MPPT control circuit used for distributed photovoltaic array |
Non-Patent Citations (1)
| Title |
|---|
| 李烨: "光伏电站有功功率控制策略研究", 《中国优秀硕士学位论文全文数据库 工程科技II辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105870964A (en) * | 2016-03-31 | 2016-08-17 | 国网天津市电力公司 | Microgrid-based distributed photovoltaic power generation boost (Boost) control method |
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