CN105870964A - Microgrid-based distributed photovoltaic power generation boost (Boost) control method - Google Patents
Microgrid-based distributed photovoltaic power generation boost (Boost) control method Download PDFInfo
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- CN105870964A CN105870964A CN201610203741.9A CN201610203741A CN105870964A CN 105870964 A CN105870964 A CN 105870964A CN 201610203741 A CN201610203741 A CN 201610203741A CN 105870964 A CN105870964 A CN 105870964A
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- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000010248 power generation Methods 0.000 title claims abstract description 19
- 238000004146 energy storage Methods 0.000 claims abstract description 30
- 230000005611 electricity Effects 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000010349 pulsation Effects 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
- 238000003860 storage Methods 0.000 description 1
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- H02J3/385—
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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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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention provides a microgrid-based distributed photovoltaic power generation boost (Boost) control method, which comprises the following steps: firstly, detecting a voltage of a microgrid connection point and calculating a difference value between an actual voltage and a preset voltage; judging whether an output power of a microgrid needs to be increased or reduced through the size of a quantity difference; if the output power of the microgrid needs to be increased, firstly detecting whether an energy storage unit can discharge or not, if so, controlling the energy storage unit to discharge through an energy storage unit controller, and if not, judging whether a current photovoltaic cell panel runs at the maximum power point or not; and if so, not needing to adjust, and if not, carrying out control according to a conventional MPPT method to increase the power output. The microgrid-based distributed photovoltaic power generation boost (Boost) control method has the effects that after the control method is adopted by a photovoltaic power generation system, the change of a power load can be quickly and effectively tracked; and the proper power is output in an automatic adapting manner by combining charging and discharging of the energy storage unit, so that the capacity of the energy storage unit can be greatly reduced; and the engineering investment is reduced.
Description
Technical field
The invention belongs to microgrid type distributed photovoltaic power generation technology technical field, particularly relate to a kind of for
The distributed photovoltaic power generation Boost boost control method of micro-capacitance sensor.
Background technology
Parallel network power generation starts from the beginning of the eighties, due to the plurality of advantages of solar energy power generating, its
Research and development, industrialized manufacture technology and market development have become as the focus of world competition.
Control method for photovoltaic generation output is mainly maximum power point tracking (Maximum at present
Power Point Tracking, is called for short MPPT) method, MPPT control method mainly has three kinds: 1)
Constant voltage control methods；2) disturbance observation method；3) incremental conductance method.The core of these methods is all passed through
The generating voltage of detecting real-time photovoltaic battery panel, and follow the trail of ceiling voltage current value (VI), make micro-capacitance sensor system
System is with maximum power output, and it is widely used in solar energy photovoltaic system, coordinates photovoltaic battery panel, storage
Can unit, the work of load.
Therefore, MPPT system is a kind of duty by regulating electrical module, enables photovoltaic panel defeated
Go out more electric energy, it is possible to the unidirectional current sent by solar panel is effectively stored in accumulator or supplies
Give the electrical system that load uses.In microgrid type photovoltaic generating system (abbreviation micro-capacitance sensor), energy storage list
The part that unit is the most indispensable, plays the merit stabilized voltage pulsation, maintain short-time rating balance
Energy.But energy-storage units extravagent price has drawn high the construction cost of microgrid type photovoltaic generating system.
Summary of the invention
In order to solve the problems referred to above, it is an object of the invention to provide a kind of distributed light for micro-capacitance sensor
Volt generating Boost boost control method.
In order to achieve the above object, the distributed photovoltaic power generation Boost for micro-capacitance sensor that the present invention provides
Boost control method includes the following step performed in order:
Step 1) first detect inverter and the distribution system in micro-capacitance sensor in microgrid type photovoltaic generating system
The virtual voltage u of junction point P, and calculate virtual voltage u and predeterminated voltage u0Difference △ u；
Step 2) judge that virtual voltage is the most equal with predeterminated voltage, i.e. judge whether difference △ u is zero；
If it is judged that be "Yes", then this method so far terminates, and otherwise next step enters step 3)；
Step 3) judge that above-mentioned difference △ u, whether more than zero, if it is judged that be "Yes", then enters
Step 4), it is judged that result is that then next step enters step 5 to "No")；
Step 4) judge whether energy-storage units can discharge, if it is judged that be "Yes", then enter step
Rapid 6), it is judged that result is "No", then step 7 is entered)；
Step 5) judge that energy-storage units is the most chargeable, if it is judged that be "Yes", then enter step
Rapid 8), it is judged that result is "No", then step 9 is entered)；
Step 6) control energy-storage units charging；This method so far terminates；
Step 7) reduce the output of photovoltaic generating system, and judge that the operating point of photovoltaic battery panel is
The no left side at output characteristic curve MPPT point D, if it is judged that be "Yes", then enters step
12), if it is judged that be on MPPT point D or on the right side of MPPT point D, then next step enters
Step 11)；
Step 8) control energy-storage units electric discharge；This method so far terminates；
Step 9) increase the output of photovoltaic generating system, and judge whether current photovoltaic battery panel is transported
Row is at maximum power point, if it is judged that be "Yes", then without adjusting, this method so far terminates；
Otherwise next step enters step 10)；
Step 10) it is controlled according to conventional MPPT method, to increase the output of its power, then judge
The operating point of photovoltaic battery panel whether in the left side of output characteristic curve MPPT point D, if it is judged that
For "Yes", then enter step 11), otherwise next step enters step 12)；
Step 11) reduce Boost circuit dutycycle D, with increase photovoltaic battery panel port electricity
Pressure, so that the output of photovoltaic battery panel reduces；This method so far terminates；
Step 12) increase Boost circuit dutycycle D, with reduce photovoltaic battery panel port electricity
Pressure；This method so far terminates.
In step 9) in, described judges whether current photovoltaic battery panel operates in the public affairs of maximum power point
Formula is:
Wherein: U2, I2 are photovoltaic battery panel port voltage and electric current in this calculating cycle, dI is upper one
Photovoltaic battery panel port current I1 and photovoltaic battery panel port current in this calculating cycle in the individual calculating cycle
The difference of I2；DU be in a upper calculating cycle photovoltaic battery panel port voltage U1 with in this calculating cycle
The difference of photovoltaic battery panel port voltage U2.
In step 7) and step 10) in, whether the described operating point judging photovoltaic battery panel is in output
Formula on the left of characteristic curve MPPT point D is:
Wherein: U2, I2 are photovoltaic battery panel port voltage and electric current in this calculating cycle, dI is upper one
Photovoltaic battery panel port current I1 and photovoltaic battery panel port current in this calculating cycle in the individual calculating cycle
The difference of I2；DU be in a upper calculating cycle photovoltaic battery panel port voltage U1 with in this calculating cycle
The difference of photovoltaic battery panel port voltage U2.
The effect of the distributed photovoltaic power generation Boost boost control method for micro-capacitance sensor that the present invention provides
Really: after photovoltaic generating system uses this control method, can the most effectively follow the tracks of the change of electrical load,
In conjunction with the discharge and recharge of energy-storage units, automatically adapt to export suitable power, such that it is able to significantly save energy storage
The capacity of unit, reduces construction investment.
Accompanying drawing explanation
Fig. 1 is the output characteristic curve figure of photovoltaic cell；
Fig. 2 is the illustraton of model of microgrid type photovoltaic generating system；
Fig. 3 is the distributed photovoltaic power generation Boost boosting rectifier control side for micro-capacitance sensor provided for the present invention
Method flow chart；
Detailed description of the invention
The distributed photovoltaic for micro-capacitance sensor with specific embodiment, the present invention provided below in conjunction with the accompanying drawings
Generating Boost boost control method is described in detail.
Fig. 1 is the output characteristic curve figure of photovoltaic cell.It can be seen that photovoltaic cell output
Electric current IphVariation tendency in non-linear reduction is increased with port voltage U.MPPT on characteristic curve
Point D is a bit of photovoltaic cell output voltage and amp product maximum, is the peak power of photovoltaic cell
Point.During it will be seen from figure 1 that the port voltage U of photovoltaic cell changes, its output also can occur
Change.This method reaches to control the purpose of output by changing photovoltaic cell port voltage U；This
The microgrid type photovoltaic power generation system model that invention relates to is as shown in Figure 2；The unidirectional current of photovoltaic array output
Boosting through Boost circuit, the outfan of Boost circuit is connected in parallel with energy-storage units,
This unidirectional current is transformed into alternating current through inverter afterwards, and sends the micro-capacitance sensor being connected with inverter to
Interior distribution system.
As it is shown on figure 3, the distributed photovoltaic power generation Boost for micro-capacitance sensor that the present invention provides rises voltage-controlled
Method processed includes the following step performed in order:
Step 1) first detect inverter and the distribution system in micro-capacitance sensor in microgrid type photovoltaic generating system
The virtual voltage u of junction point P (i.e. the voltage of micro-grid connection point), and calculate virtual voltage u and preset
Voltage u0Difference △ u；
Step 2) judge that virtual voltage is the most equal with predeterminated voltage, i.e. judge whether difference △ u is zero；
If it is judged that be "Yes", then this method so far terminates, and otherwise next step enters step 3)；
Step 3) judge that above-mentioned difference △ u, whether more than zero, if it is judged that be "Yes", then enters
Step 4), it is judged that result is that then next step enters step 5 to "No")；
Step 4) judge whether energy-storage units can discharge, if it is judged that be "Yes", then enter step
Rapid 6), it is judged that result is "No", then step 7 is entered)；
Step 5) judge that energy-storage units is the most chargeable, if it is judged that be "Yes", then enter step
Rapid 8), it is judged that result is "No", then step 9 is entered)；
Step 6) control energy-storage units charging；This method so far terminates；
Step 7) reduce the output of photovoltaic generating system, and judge that the operating point of photovoltaic battery panel is
The no left side at output characteristic curve MPPT point D, if it is judged that be "Yes", then enters step
12), if it is judged that be on MPPT point D or on the right side of MPPT point D, then next step enters
Step 11)；
Step 8) control energy-storage units electric discharge；This method so far terminates；
Step 9) increase the output of photovoltaic generating system, and judge whether current photovoltaic battery panel is transported
Row is at maximum power point, if it is judged that be "Yes", then without adjusting, this method so far terminates；
Otherwise next step enters step 10)；
Step 10) it is controlled according to conventional MPPT method, to increase the output of its power, then judge
The operating point of photovoltaic battery panel whether in the left side of output characteristic curve MPPT point D, if it is judged that
For "Yes", then enter step 11), otherwise next step enters step 12)；
Step 11) reduce Boost circuit dutycycle D, with increase photovoltaic battery panel port electricity
Pressure, so that the output of photovoltaic battery panel reduces；This method so far terminates；
Step 12) increase Boost circuit dutycycle D, with reduce photovoltaic battery panel port electricity
Pressure；This method so far terminates.
In step 9) in, described judges whether current photovoltaic battery panel operates in the public affairs of maximum power point
Formula is:
Wherein: U2, I2 are photovoltaic battery panel port voltage and electric current in this calculating cycle, dI is upper one
Photovoltaic battery panel port current I1 and photovoltaic battery panel port current in this calculating cycle in the individual calculating cycle
The difference of I2；DU be in a upper calculating cycle photovoltaic battery panel port voltage U1 with in this calculating cycle
The difference of photovoltaic battery panel port voltage U2.
In step 7) and step 10) in, whether the described operating point judging photovoltaic battery panel is in output
Formula on the left of characteristic curve MPPT point D is:
Wherein: U2, I2 are photovoltaic battery panel port voltage and electric current in this calculating cycle, dI is upper one
Photovoltaic battery panel port current I1 and photovoltaic battery panel port current in this calculating cycle in the individual calculating cycle
The difference of I2；DU be in a upper calculating cycle photovoltaic battery panel port voltage U1 with in this calculating cycle
The difference of photovoltaic battery panel port voltage U2.
The distributed photovoltaic power generation Boost boost control method for micro-capacitance sensor that the present invention provides is used
Technical scheme be: first detect the voltage of micro-grid connection point, calculate virtual voltage and predeterminated voltage
Difference；Then the output needing to increase or reduce micro-capacitance sensor is judged by quantity extent；
As micro-capacitance sensor output need to be increased, then first determine whether whether energy-storage units can discharge, the most then pass through
Energy-storage units controller controls energy-storage units electric discharge；As discharged, then judge current photovoltaic battery panel
Whether operate at maximum power point, the most then without adjusting, as non-, enter according to conventional MPPT method
Row controls, to increase the output of its power；If micro-capacitance sensor output need to be reduced, then need to judge energy-storage units
Whether can charge, the most then control energy-storage units by energy-storage units controller and charge；As filled
Electricity, then judge the operating point of photovoltaic battery panel whether in the left side of output characteristic curve MPPT point, as
Left side then needs to increase dutycycle D of Boost circuit, to reduce the port voltage of photovoltaic battery panel,
As on MPPT point or on the right side of MPPT point, then need to reduce dutycycle D of Boost circuit,
To increase the port voltage of photovoltaic battery panel, so that the output of photovoltaic battery panel reduces.
The present invention provide the distributed photovoltaic power generation Boost boost control method for micro-capacitance sensor have as
Lower feature:
(1) without changing the hardware configuration of existing photovoltaic generating system, only make in control algolithm and changing
Become so that the inventive method has the wider suitability.
(2) power to photovoltaic generating system controls to be to utilize himself characteristic, rather than relies on inversion
The control of device, such that it is able to simplify the control strategy of inverter, more brief on control principle.
(3) power controls is the most merely maximum power point tracking, but chases after bearing power
Track controls, and the control strategy more combining energy-storage units links, such that it is able to rapidly adapt to bearing power
Change, it is no longer necessary to large-scale energy-storage units carries out stabilizing power.
Claims (3)
1., for a distributed photovoltaic power generation Boost boost control method for micro-capacitance sensor, its feature exists
In: the described distributed photovoltaic power generation Boost boost control method for micro-capacitance sensor includes holding in order
The following step of row:
Step 1) first detect inverter and the distribution system in micro-capacitance sensor in microgrid type photovoltaic generating system
The virtual voltage u of junction point P, and calculate virtual voltage u and predeterminated voltage u0Difference DELTA u；
Step 2) judge that virtual voltage is the most equal with predeterminated voltage, i.e. judge whether difference DELTA u is zero；
If it is judged that be "Yes", then this method so far terminates, and otherwise next step enters step 3)；
Step 3) judge that above-mentioned difference DELTA u, whether more than zero, if it is judged that be "Yes", then enters
Step 4), it is judged that result is that then next step enters step 5 to "No")；
Step 4) judge whether energy-storage units can discharge, if it is judged that be "Yes", then enter step
Rapid 6), it is judged that result is "No", then step 7 is entered)；
Step 5) judge that energy-storage units is the most chargeable, if it is judged that be "Yes", then enter step
Rapid 8), it is judged that result is "No", then step 9 is entered)；
Step 6) control energy-storage units charging；This method so far terminates；
Step 7) reduce the output of photovoltaic generating system, and judge that the operating point of photovoltaic battery panel is
The no left side at output characteristic curve MPPT point D, if it is judged that be "Yes", then enters step
12), if it is judged that be on MPPT point D or on the right side of MPPT point D, then next step enters
Step 11)；
Step 8) control energy-storage units electric discharge；This method so far terminates；
Step 9) increase the output of photovoltaic generating system, and judge whether current photovoltaic battery panel is transported
Row is at maximum power point, if it is judged that be "Yes", then without adjusting, this method so far terminates；
Otherwise next step enters step 10)；
Step 10) it is controlled according to conventional MPPT method, to increase the output of its power, then judge
The operating point of photovoltaic battery panel whether in the left side of output characteristic curve MPPT point D, if it is judged that
For "Yes", then enter step 11), otherwise next step enters step 12)；
Step 11) reduce Boost circuit dutycycle D, with increase photovoltaic battery panel port electricity
Pressure, so that the output of photovoltaic battery panel reduces；This method so far terminates；
Step 12) increase Boost circuit dutycycle D, with reduce photovoltaic battery panel port electricity
Pressure；This method so far terminates.
Distributed photovoltaic power generation Boost for micro-capacitance sensor the most according to claim 1 rises voltage-controlled
Method processed, it is characterised in that: in step 9) in, described judges whether current photovoltaic battery panel runs
Formula at maximum power point is:
Wherein: U2, I2 are photovoltaic battery panel port voltage and electric current in this calculating cycle, dI is upper one
Photovoltaic battery panel port current I1 and photovoltaic battery panel port current in this calculating cycle in the individual calculating cycle
The difference of I2；DU be in a upper calculating cycle photovoltaic battery panel port voltage U1 with in this calculating cycle
The difference of photovoltaic battery panel port voltage U2.
Distributed photovoltaic power generation Boost for micro-capacitance sensor the most according to claim 1 rises voltage-controlled
Method processed, it is characterised in that: in step 7) and step 10) in, described judge photovoltaic battery panel
Operating point whether formula on the left of output characteristic curve MPPT point D is:
Wherein: U2, I2 are photovoltaic battery panel port voltage and electric current in this calculating cycle, dI is upper one
Photovoltaic battery panel port current I1 and photovoltaic battery panel port current in this calculating cycle in the individual calculating cycle
The difference of I2；DU be in a upper calculating cycle photovoltaic battery panel port voltage U1 with in this calculating cycle
The difference of photovoltaic battery panel port voltage U2.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109066774A (en) * | 2018-08-02 | 2018-12-21 | 国网安徽省电力有限公司芜湖供电公司 | Utilize distributed energy region managing and control system and its control method |
| CN113270876A (en) * | 2021-05-27 | 2021-08-17 | 深圳供电局有限公司 | Power balancing method, device, control chip and storage medium |
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| US20130002032A1 (en) * | 2011-06-28 | 2013-01-03 | Shigeki Mori | Power grid operation control system, device, and method |
| CN104092278A (en) * | 2014-07-11 | 2014-10-08 | 安徽启光能源科技研究院有限公司 | Energy management method applied to photovoltaic energy storage system |
| CN104333316A (en) * | 2014-09-24 | 2015-02-04 | 国家电网公司 | Boost control method for off-grid type distributed photovoltaic generating |
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2016
- 2016-03-31 CN CN201610203741.9A patent/CN105870964A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20130002032A1 (en) * | 2011-06-28 | 2013-01-03 | Shigeki Mori | Power grid operation control system, device, and method |
| CN104092278A (en) * | 2014-07-11 | 2014-10-08 | 安徽启光能源科技研究院有限公司 | Energy management method applied to photovoltaic energy storage system |
| CN104333316A (en) * | 2014-09-24 | 2015-02-04 | 国家电网公司 | Boost control method for off-grid type distributed photovoltaic generating |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066774A (en) * | 2018-08-02 | 2018-12-21 | 国网安徽省电力有限公司芜湖供电公司 | Utilize distributed energy region managing and control system and its control method |
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| CN113270876A (en) * | 2021-05-27 | 2021-08-17 | 深圳供电局有限公司 | Power balancing method, device, control chip and storage medium |
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Application publication date: 20160817 |