CN109449989A - A kind of inverter input side control method and the inverter using it - Google Patents
A kind of inverter input side control method and the inverter using it Download PDFInfo
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- CN109449989A CN109449989A CN201811542259.3A CN201811542259A CN109449989A CN 109449989 A CN109449989 A CN 109449989A CN 201811542259 A CN201811542259 A CN 201811542259A CN 109449989 A CN109449989 A CN 109449989A
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 230000005611 electricity Effects 0.000 claims description 8
- 238000011897 real-time detection Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
Classifications
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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
Abstract
The present invention relates to a kind of inverter input side control methods, it is connected with applied to input side in the inverter of two kinds of input sources of voltage source and photovoltaic source, the inverter input side control method of compatible voltage source input and photovoltaic source input are as follows: output impedance detection is carried out to the input source of inverter, to identify that its current input side is voltage source or photovoltaic source, then the corresponding maximum power tracing of voltage source or photovoltaic source progress for current input side.The invention further relates to a kind of inverters using above-mentioned inverter input side control method.The present invention solves the problems, such as that current inverter can not be compatible with other input sources, to extend the application scenarios of inverter.
Description
Technical field
The invention belongs to field of photovoltaic power generation, and in particular to a kind of input side control method applied to photovoltaic DC-to-AC converter with
And the inverter using the input side control method.
Background technique
Photovoltaic DC-to-AC converter is the core component of photovoltaic generating system, is responsible for the DC conversion for generating photovoltaic panel (PV)
For alternating current.In general, photovoltaic DC-to-AC converter only supports PV to input, so that its application scenarios is limited.Due to for PV input
Control method and other input sources (such as voltage source/current source) are different, to realize compatible a variety of input source inputs (such as Fig. 1 institute
The compatible source PV of the inverter shown and voltage source input), inverter end must take new control program.
Summary of the invention
The object of the present invention is to provide a kind of inverter inputs that can be compatible with voltage source input and photovoltaic source input
Side control method.
In order to achieve the above objectives, the technical solution adopted by the present invention is that:
A kind of inverter input side control method is connected with two kinds of input sources of voltage source and photovoltaic source applied to input side
In inverter, the inverter input side control method of compatible the voltage source input and photovoltaic source input are as follows: to the inverter
Input source carry out output impedance detection, to identify that its current input side is the voltage source or the photovoltaic source, then be directed to
The voltage source or the photovoltaic source of current input side carry out corresponding maximum power tracing.
Preferably, impedance detection is carried out to the input source of the inverter, to identify that its current input side is the electricity
The method of potential source or the photovoltaic source are as follows: when the inverter has detected direct current input access, the inverter enters knowledge
Other state, and record input voltage U at this timestart, the inverter is that the input source sets target current value Igate, work as institute
The electric current for stating input source output reaches the target current value IgateWhen, the input voltage U of the inverter record at this timeend, from
And it utilizesCalculate the output impedance R of the input source0, as the output impedance R of the input source0Greatly
In the impedance threshold R of settinggateWhen, determine that the current input side of the inverter is the photovoltaic source, otherwise determines the inversion
The current input side of device is the voltage source.
Preferably, the inverter sets the target current value by the control loop of its DC side DC/DC circuit
Igate。
Preferably, the control loop of the DC side DC/DC circuit of the inverter works in single electric current ring control model
Set the target current value Igate。
Preferably, when identifying the current input side of the inverter is the voltage source, maximum power tracing is carried out
Method are as follows: the control loop of the DC side DC/DC circuit of the inverter is maintained at single electric current ring control model, with the of setting
One step-length Istep1It is gradually increased the given value of current of the control loop for stepping, increases the output electric current of the voltage source gradually
Greatly；During the output electric current of the voltage source is gradually increased, the output voltage of voltage source described in real-time detection, when described
The output voltage of voltage source is lower than Ustart-Ugate1When, stop the given value of current for increasing the control loop, then with setting
Second step-length Istep2The given value of current for reducing the control loop for stepping is gradually reduced the output electric current of the voltage source；
During the output electric current of the voltage source is gradually reduced, the output voltage of voltage source described in real-time detection, when the electricity
The output voltage of potential source is higher than Ustart-Ugate2When, stop reducing the given value of current of the control loop and remain unchanged, records
The output electric current I of the voltage source at this timework, the output electric current of the voltage source is made to remain Iwork, complete maximum power and chase after
Track；Wherein Ugate1For preset first voltage threshold value, Ugate2For preset second voltage threshold value.
The present invention also provides a kind of inverter, which can be compatible with voltage source input and photovoltaic source input, and use
Above-mentioned inverter input side control method.
Due to the above technical solutions, the present invention has the following advantages over the prior art: the present invention solves mesh
Preceding inverter can not be compatible with the problem of other input sources, to extend the application scenarios of inverter.
Detailed description of the invention
Attached drawing 1 is the inverter principle figure in the compatible source PV and voltage source input.
Attached drawing 2 is the I-V curve of photovoltaic source.
Attached drawing 3 is the flow chart of inverter input side control method of the invention.
Specific embodiment
The invention will be further described for embodiment shown in reference to the accompanying drawing.
Embodiment one: a kind of inverter, input side are connected with voltage source and photovoltaic source both input sources.Therefore it is used
Input side control method below.The inverter input side control method is to carry out output impedance inspection to the input source of inverter
It surveys, to identify that its current input side is voltage source or photovoltaic source, then is carried out for the voltage source or photovoltaic source of current input side
Corresponding maximum power tracing.
The electrical characteristic of PV panel is different from conventional voltage source or current source, its I-V output is curve, and voltage is with electricity
The increase of stream and reduce, and reduced amplitude non-linearity, therefore import its maximum power point at open-circuit voltage (electric current 0)
Some point between short-circuit voltage (electric current is maximum), as illustrated in solid line in figure 2.And voltage source is as common power source shapes,
It I-V output be it is linear, with the increase of electric current, voltage is remained unchanged, until electric current increase to power supply electric current limit
Value (at this time and maximum power point of power supply) processed, the I-V characteristic of voltage source is as shown in phantom in Figure 2.
Control program proposed by the present invention includes two pieces, first is that the identification of input source, is responsible for determining that currently entered is electricity
Potential source or PV panel (photovoltaic source)；Second is that different control programs is taken respectively for PV panel and voltage source, to track
The maximum power point of power supply.
One, input identification
According to the difference of voltage source and the I-V characteristic in the source PV, current power supply class is identified using the method for impedance detection
Type.Here impedance refers to the output impedance of input source, is defined as
I-V characteristic curve according to fig. 2 can be seen that the R of voltage source0Infinitesimal, levels off to 0, and the R in the source PV0It compares
Under it is bigger, therefore, detection R can be passed through0It is the source PV or voltage source to distinguish current DC side input, therefore such as attached drawing 3
It is shown, impedance detection is carried out to the input source of inverter, to identify that its current input side is the method for voltage source or photovoltaic source
Are as follows:
1, when inverter has detected direct current input access, inverter enters identification state, and records input at this time
Voltage Ustart。
2, in identification state, the control loop work of the DC side DC/DC circuit of inverter controls mould in single electric current ring
Formula, then inverter is that input source sets target current value I by the control loop of its DC side DC/DC circuitgate.The target
Current value IgateSetting determined by theoretical and practical debugging, be such as set as 3A.
3, inverter real-time detection input voltage value, when the electric current of input source output reaches target current value IgateWhen, it is inverse
Become the input voltage U of device record at this timeend。
4, it utilizes
Calculate the output impedance R of input source0。
5, according to theoretical and practical debugging, as the output impedance R of input source0Greater than the impedance threshold R of settinggateWhen, determine
The current input side of inverter is photovoltaic source, otherwise determines that the current input side of inverter is voltage source.Impedance threshold RgateSetting
It is also to be determined by theoretical and practical debugging.
Two, maximum power output
6, when identifying the current input side of inverter is photovoltaic source, the DC/DC circuit of inverter exits single electric current ring control
Molding formula calls the maximum power tracing (MPPT) for photovoltaic source to handle function, realizes that maximum power is defeated to control photovoltaic source
Out.
7, when identifying the current input side of inverter is voltage source, the method that carries out maximum power tracing are as follows:
The control loop of the DC side DC/DC circuit of inverter is maintained at single electric current ring control model, with the first of setting
Step-length Istep1It is gradually increased the given value of current of control loop for stepping, is gradually increased the output electric current of voltage source.Because when reaching
To after the peak power output of voltage source, if still increasing High-current output, voltage source voltage can quickly fall.Therefore in voltage
During the output electric current in source is gradually increased, the output voltage of real-time detection voltage source, when the output voltage of voltage source is lower than
Ustart-Ugate1When, stop the given value of current for increasing control loop immediately, then with the second step-length I of settingstep2Subtract for stepping
The given value of current of small control loop is gradually reduced the output electric current of voltage source.It exports electric current to reduce, leads to voltage source output electricity
Pressure is gradually recovered, and during the output electric current of voltage source is gradually reduced, the output voltage of real-time detection voltage source works as voltage
The output voltage in source is higher than Ustart-Ugate2When, stop reducing the given value of current of control loop and remain unchanged, record is electric at this time
The output electric current I of potential sourcework, given value of current simultaneously keeps IworkIt is constant, so that the output electric current of voltage source is remained Iwork, at this time
Power is the peak power output for being regarded as voltage source, completes maximum power tracing.Wherein Ugate1For preset first voltage
Threshold value, Ugate2For preset second voltage threshold value.Ugate1、Ugate2And Istep1、Istep2Come with the debugging of theoretical and laboratory
It determines, is set to U in the practical debugging of this programmegate1=20V, Ugate2=0.5V, Istep1=0.5A, Istep2=0.75A.
Above scheme enhances the compatibility of photovoltaic DC-to-AC converter, extends the application scenarios of inverter, improves inverter
Competitiveness.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of inverter input side control method is connected with the inverse of two kinds of input sources of voltage source and photovoltaic source applied to input side
Become in device, it is characterised in that: the inverter input side control method of compatible the voltage source input and photovoltaic source input are as follows: to institute
The input source for stating inverter carries out output impedance detection, to identify that its current input side is the voltage source or the photovoltaic
Source, then corresponding maximum power tracing is carried out for the voltage source of current input side or the photovoltaic source.
2. a kind of inverter input side control method according to claim 1, it is characterised in that: to the defeated of the inverter
Enter source and carry out impedance detection, to identify that its current input side is the method for the voltage source or the photovoltaic source are as follows: when described
When inverter has detected direct current input access, the inverter enters identification state, and records input voltage U at this timestart,
The inverter is that the input source sets target current value Igate, when the electric current of input source output reaches the target electricity
Flow valuve IgateWhen, the input voltage U of the inverter record at this timeend, to utilizeDescribed in calculating
The output impedance R of input source0, as the output impedance R of the input source0Greater than the impedance threshold R of settinggateWhen, determine described inverse
Become the current input side of device as the photovoltaic source, otherwise determines that the current input side of the inverter is the voltage source.
3. a kind of inverter input side control method according to claim 2, it is characterised in that: the inverter passes through it
The control loop of DC side DC/DC circuit and set the target current value Igate。
4. a kind of inverter input side control method according to claim 3, it is characterised in that: the direct current of the inverter
The control loop work of side DC/DC circuit sets the target current value I in single electric current ring control modelgate。
5. a kind of inverter input side control method according to any one of claim 4, it is characterised in that: when identifying
When the current input side of inverter is the voltage source, the method that carries out maximum power tracing are as follows: the direct current of the inverter
The control loop of side DC/DC circuit is maintained at single electric current ring control model, with the first step-length I of settingstep1Gradually increase for stepping
The given value of current of the big control loop, is gradually increased the output electric current of the voltage source；In the output electricity of the voltage source
During stream is gradually increased, the output voltage of voltage source described in real-time detection, when the output voltage of the voltage source is lower than
Ustart-Ugate1When, stop the given value of current for increasing the control loop, then with the second step-length I of settingstep2Subtract for stepping
The given value of current of the small control loop is gradually reduced the output electric current of the voltage source；In the output electricity of the voltage source
During stream is gradually reduced, the output voltage of voltage source described in real-time detection, when the output voltage of the voltage source is higher than
Ustart-Ugate2When, the given value of current for stopping reducing the control loop simultaneously remains unchanged, the record voltage source at this time it is defeated
Electric current I outwork, the output electric current of the voltage source is made to remain Iwork, complete maximum power tracing；Wherein Ugate1It is preset
First voltage threshold value, Ugate2For preset second voltage threshold value.
6. a kind of inverter, input side is connected with two kinds of input sources of voltage source and photovoltaic source, it is characterised in that: the inverter
Using the inverter input side control of the input of compatibility voltage source and photovoltaic source input as described in any one of claims 1 to 5
Method.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110112777A (en) * | 2019-05-13 | 2019-08-09 | 无锡清盛电力电子有限公司 | Adaptive approach, device and the electric energy router of photovoltaic and energy storage input |
| CN110635704A (en) * | 2019-08-22 | 2019-12-31 | 江苏固德威电源科技股份有限公司 | Inverter bus voltage control method |
| CN113690962A (en) * | 2021-07-29 | 2021-11-23 | 广东博力威科技股份有限公司 | MPPT control method, device, equipment and storage medium for different input sources |
| CN113991745A (en) * | 2021-11-30 | 2022-01-28 | 阳光电源股份有限公司 | Inverter control method, inverter controller, inverter and power supply system |
| CN116774768A (en) * | 2023-08-22 | 2023-09-19 | 深圳市德兰明海新能源股份有限公司 | Power tracking method and system for channel multiplexing energy storage power supply |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110112777A (en) * | 2019-05-13 | 2019-08-09 | 无锡清盛电力电子有限公司 | Adaptive approach, device and the electric energy router of photovoltaic and energy storage input |
| CN110635704A (en) * | 2019-08-22 | 2019-12-31 | 江苏固德威电源科技股份有限公司 | Inverter bus voltage control method |
| CN110635704B (en) * | 2019-08-22 | 2021-08-24 | 江苏固德威电源科技股份有限公司 | Inverter bus voltage control method |
| CN113690962A (en) * | 2021-07-29 | 2021-11-23 | 广东博力威科技股份有限公司 | MPPT control method, device, equipment and storage medium for different input sources |
| CN113690962B (en) * | 2021-07-29 | 2024-04-05 | 广东博力威科技股份有限公司 | MPPT control method, device, equipment and storage medium for different input sources |
| CN113991745A (en) * | 2021-11-30 | 2022-01-28 | 阳光电源股份有限公司 | Inverter control method, inverter controller, inverter and power supply system |
| CN113991745B (en) * | 2021-11-30 | 2024-04-12 | 阳光电源股份有限公司 | Inverter control method, inverter controller, inverter and power supply system |
| CN116774768A (en) * | 2023-08-22 | 2023-09-19 | 深圳市德兰明海新能源股份有限公司 | Power tracking method and system for channel multiplexing energy storage power supply |
| CN116774768B (en) * | 2023-08-22 | 2024-02-06 | 深圳市德兰明海新能源股份有限公司 | Power tracking method and system for channel multiplexing energy storage power supply |
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Address after: 215000 No. 90, Zijin Road, high tech Zone, Suzhou, Jiangsu Patentee after: Goodway Technology Co.,Ltd. Patentee after: Goodway Power Technology (Guangde) Co., Ltd Address before: 215163 No.189 Kunlunshan Road, high tech Zone, Suzhou City, Jiangsu Province Patentee before: JIANGSU GOODWE POWER SUPPLY TECHNOLOGY Co.,Ltd. Patentee before: Goodway Power Technology (Guangde) Co., Ltd |