CN104283412B - Photovoltaic inverter starting method and system - Google Patents
Photovoltaic inverter starting method and system Download PDFInfo
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- CN104283412B CN104283412B CN201410385429.7A CN201410385429A CN104283412B CN 104283412 B CN104283412 B CN 104283412B CN 201410385429 A CN201410385429 A CN 201410385429A CN 104283412 B CN104283412 B CN 104283412B
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- photovoltaic
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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 invention relates to a photovoltaic inverter starting method and system. The method includes the following steps that first, after a photovoltaic inverter is soft started at alternating current, the photovoltaic inverter is controlled to work in a rectifier mode, and the voltage value of a rectification bus is controlled to reach the photovoltaic voltage value of a photovoltaic battery array; second, the photovoltaic inverter is controlled to work in an active and reactive power mode, and the output power of the photovoltaic inverter is gradually increased till the photovoltaic inverter reaches preset output power; third, the photovoltaic inverter is controlled to work in a maximum power tracking mode. According to the photovoltaic inverter starting method and system, all modes can be switched through the different working modes of the photovoltaic inverter by detecting photovoltaic voltage and controlling the output power, the photovoltaic inverter can be well controlled to start when the power of the photovoltaic battery array is low, and the problem that because the power is low, the photovoltaic inverter needs to be repeatedly started and shut down is avoided.
Description
Technical field
A kind of the present invention relates to photovoltaic DC-to-AC converter technical field, more particularly, it relates to open method of photovoltaic DC-to-AC converter
And system.
Background technology
Photovoltaic generation, as a kind of main new forms of energy, is just widely used.The C-V characteristic of photovoltaic battery array is between electricity
Between potential source and current source, belong to a kind of highly unstable energy, the size of its power output is all non-to amblent air temperature, load
Often sensitive.
It is typically all at present to pass through photovoltaic DC-to-AC converter directly constantly to make repeated attempts switching on and shutting down, treat photovoltaic battery array output
When power disclosure satisfy that the minimum power that photovoltaic DC-to-AC converter runs, photovoltaic DC-to-AC converter could normally run.This method must be led to
After crossing the normal operation of photovoltaic DC-to-AC converter, be possible to determine photovoltaic battery array peak power output, in photovoltaic battery array work(
When rate is less (as morning, dusk or rainy weather), under the peak power output not knowing photovoltaic battery array, photovoltaic inversion
Device continuously attempts to switching on and shutting down, so will necessarily affect the life-span of photovoltaic DC-to-AC converter itself, and electrical network is impacted.
Content of the invention
The technical problem to be solved in the present invention is, less in the power of photovoltaic battery array for existing photovoltaic DC-to-AC converter
When repeated switching affect device lifetime and defect that electrical network is impacted, provide a kind of open method of photovoltaic DC-to-AC converter and
System.
The technical solution adopted for the present invention to solve the technical problems is：Construct a kind of open method of photovoltaic DC-to-AC converter,
Comprise the following steps：
S1, described photovoltaic DC-to-AC converter is controlled to be operated in rectifier pattern after described photovoltaic DC-to-AC converter AC soft starting, and
The bus voltage value of control rectification reaches the photovoltaic voltage value of photovoltaic battery array；
S2, the described photovoltaic DC-to-AC converter of control are operated in active reactive pattern, and are stepped up the defeated of described photovoltaic DC-to-AC converter
Go out power until reaching default power output；
S3, the described photovoltaic DC-to-AC converter of control are operated in maximal power tracing pattern；
Detect the photovoltaic voltage value of current photovoltaic battery array in described step S2, described photovoltaic is increased with the first step-length inverse
Become the power output of device, and when detecting that current photovoltaic voltage value is increased to the photovoltaic voltage value before increasing power output, continue
Increase the power output of described photovoltaic DC-to-AC converter with the first step-length, once increase defeated before the current photovoltaic voltage value of detection is increased to
When going out the photovoltaic voltage value after power, continue to increase the power output of photovoltaic DC-to-AC converter with the first step-length, until it reaches default defeated
Go out power.
In the open method according to photovoltaic DC-to-AC converter of the present invention, a length of 0.5kw of the first step in described step S2
To 2kw.
In the open method according to photovoltaic DC-to-AC converter of the present invention, a length of 1kw of the first step in described step S2.
In the open method according to photovoltaic DC-to-AC converter of the present invention, in described step S2, default power output is institute
State the 101% to 105% of photovoltaic DC-to-AC converter rated power.
Present invention also offers a kind of open system of photovoltaic DC-to-AC converter, including：
First control unit, for controlling described photovoltaic DC-to-AC converter to be operated in after described photovoltaic DC-to-AC converter AC soft starting
Rectifier pattern, and control the bus voltage value of rectification to reach the photovoltaic voltage value of photovoltaic battery array；
Second control unit, for controlling described photovoltaic DC-to-AC converter to be operated in active reactive pattern, and is stepped up described
The power output of photovoltaic DC-to-AC converter is until reach default power output；
3rd control unit, for controlling described photovoltaic DC-to-AC converter to be operated in maximal power tracing pattern；
Described second control unit detects the photovoltaic voltage value of current photovoltaic battery array, increases described light with the first step-length
The power output of volt inverter, and when detecting that current photovoltaic voltage value is increased to the photovoltaic voltage value before increasing power output,
Continue to increase the power output of described photovoltaic DC-to-AC converter with the first step-length, once increase before current photovoltaic voltage value is increased to detecting
Plus during photovoltaic voltage value after power output, continue to increase the power output of photovoltaic DC-to-AC converter with the first step-length, until it reaches pre-
If power output.
In the open system according to photovoltaic DC-to-AC converter of the present invention, a length of 0.5kw to 2kw of the described first step.
In the open system according to photovoltaic DC-to-AC converter of the present invention, a length of 1kw of the described first step.
In the open system according to photovoltaic DC-to-AC converter of the present invention, described default power output is that described photovoltaic is inverse
Become the 101% to 105% of device rated power.
Implement the open method of photovoltaic DC-to-AC converter and the system of the present invention, have the advantages that：The present invention utilizes light
The different mode of operation of volt inverter, by the detection to photovoltaic voltage and the control to power output, completes various patterns
Switching, controls the startup when photovoltaic battery array power is less for the photovoltaic DC-to-AC converter well, it is to avoid because power is less anti-
The problem of multiple switching on and shutting down.
Brief description
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the flow chart of the open method of the photovoltaic DC-to-AC converter according to the preferred embodiment of the present invention；
Fig. 2 is the module diagram of the open system of the photovoltaic DC-to-AC converter according to the preferred embodiment of the present invention.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.
Refer to Fig. 1, be the flow chart of the open method of photovoltaic DC-to-AC converter according to the preferred embodiment of the present invention.As Fig. 1
Shown, the open method of the photovoltaic DC-to-AC converter that this embodiment provides comprises the following steps：
First, in step sl, photovoltaic DC-to-AC converter is controlled to be operated in rectifier mould after photovoltaic DC-to-AC converter AC soft starting
Formula, and control the bus voltage value of rectification to reach photovoltaic (PV) magnitude of voltage of photovoltaic battery array.This step can directly be passed through
The DSP control chip of photovoltaic DC-to-AC converter is realized, and this DSP control chip is sending switching signal to soft starting circuit by the friendship inputting
After stream electricity completes soft start, then control photovoltaic DC-to-AC converter to be operated in rectifier pattern, alternating current by rectifier circuit rectifies is
Direct current, and make the PV magnitude of voltage for photovoltaic battery array for the bus voltage value of rectification, allow system be in a stable fortune
Row state.
Subsequently, in step s 2, when the bus voltage value of rectification reaches the PV magnitude of voltage of photovoltaic battery array, photovoltaic inversion
Device is stable, now the mode of operation of photovoltaic DC-to-AC converter is adjusted to active reactive (PQ) pattern.And it is stepped up photovoltaic
The power output of inverter is until reach default power output.This default power output is preferably photovoltaic DC-to-AC converter rated power
101% to 105%.In this step, photovoltaic DC-to-AC converter sequentially passes through booster circuit, inversion by the direct current of photovoltaic battery array
The power output such as circuit and output filter circuit.Can be accounted for by increasing the conducting of IGBT switching tube in inverter circuit in this step
Sky compares to increase the power output of photovoltaic DC-to-AC converter.
In a preferred embodiment of the invention, step S2 can be gradually increased photovoltaic DC-to-AC converter with setting time interval
Power output, increases 1kw in such as every 10 minutes, until it reaches default power output.Another preferred embodiment in the present invention
In, step S2 can detect the PV magnitude of voltage of current photovoltaic battery array, increase the output work of photovoltaic DC-to-AC converter with the first step-length
Rate, and detect current photovoltaic battery array PV magnitude of voltage be increased to increase power output before PV magnitude of voltage when, continue with
First step-length increases the power output of photovoltaic DC-to-AC converter, and once increases power output detecting before current PV magnitude of voltage is increased to
During rear PV magnitude of voltage, continue to increase the power output of photovoltaic DC-to-AC converter with the first step-length, until it reaches default power output.Should
First step-length is preferably 0.5kw to 2kw.For example, the PV magnitude of voltage that current photovoltaic battery array is detected and stored is V1, then
The power output of photovoltaic DC-to-AC converter is increased 1kW, now the PV magnitude of voltage of photovoltaic battery array will decline, storage now photovoltaic electric
The PV magnitude of voltage of pond array is V2.With the improvement of illumination condition, the PV magnitude of voltage of photovoltaic battery array will constantly rise, when it
When rising to V1, again power output is increased 1kW, the current PV magnitude of voltage of storage is V3, when PV voltage rises to V2, again
Power output is increased 1kW, storage is V4 when its PV magnitude of voltage, when PV voltage rises to V3, increases power output again
1kW…….Through multiple power output adjustment so that the power output of photovoltaic DC-to-AC converter reaches default power output.
In step s3, the power output in photovoltaic DC-to-AC converter reaches default power output, is greater than photovoltaic DC-to-AC converter
Rated power itself 1% when, control photovoltaic DC-to-AC converter mode of operation to be switched to maximal power tracing (MPPT) pattern, photovoltaic is inverse
Become device and automatically do maximal power tracing.
Refer to Fig. 2, be the module diagram of the open system of photovoltaic DC-to-AC converter according to the preferred embodiment of the present invention.As
Shown in Fig. 2, the open system of this photovoltaic DC-to-AC converter includes the first control unit 10, the second control unit 20 and the 3rd control unit
30.
Wherein, the first control unit 10 is used for controlling described photovoltaic DC-to-AC converter work after photovoltaic DC-to-AC converter AC soft starting
In rectifier pattern, and the bus voltage value of rectification is controlled to reach the PV magnitude of voltage of photovoltaic battery array.First control unit 10
Can directly be realized by the DSP control chip of photovoltaic DC-to-AC converter, this DSP control chip is sending switching signal to soft start electricity
After route alternating current completes soft start, then control photovoltaic DC-to-AC converter to be operated in rectifier pattern, the alternating current of input is passed through whole
Current circuit rectification is direct current, and makes the PV magnitude of voltage for photovoltaic battery array for the bus voltage value of rectification, allows system to be in
One stable running status.
Second control unit 20 is used for controlling photovoltaic DC-to-AC converter to be operated in PQ pattern, and is stepped up described photovoltaic DC-to-AC converter
Power output until reach default power output.This default power output is preferably the 101% of photovoltaic DC-to-AC converter rated power
To 105%.Second control unit 20 controls and sequentially passes through booster circuit, inverter circuit and defeated by the direct current of photovoltaic battery array
Go out the power outputs such as filter circuit.Photovoltaic DC-to-AC converter is increased by the conducting dutycycle increasing IGBT switching tube in inverter circuit
The power output of photovoltaic DC-to-AC converter.
In a preferred embodiment of the invention, the second control unit 20 can be gradually increased photovoltaic with setting time interval
The power output of inverter, increases 1kw in such as every 10 minutes, until it reaches default power output.Another in the present invention is excellent
Select in embodiment, the second control unit 20 can detect the PV magnitude of voltage of current photovoltaic battery array, light is increased with the first step-length
The power output of volt inverter, and it is increased to the PV before increasing power output in the PV magnitude of voltage detecting current photovoltaic battery array
During magnitude of voltage, continue to increase the power output of photovoltaic DC-to-AC converter with the first step-length, and before detecting that current PV magnitude of voltage is increased to
When once increasing the PV magnitude of voltage after power output, continue to increase the power output of photovoltaic DC-to-AC converter with the first step-length, until reaching
To default power output.This first step-length is preferably 0.5kw to 2kw.
3rd control unit 30 is used for controlling photovoltaic DC-to-AC converter to be operated in maximal power tracing pattern.In photovoltaic DC-to-AC converter
Power output reaches default power output, be greater than photovoltaic DC-to-AC converter rated power itself 1% when, the 3rd control unit 30
The mode of operation controlling photovoltaic DC-to-AC converter is switched to maximal power tracing (MPPT) pattern, and photovoltaic DC-to-AC converter does peak power automatically
Follow the tracks of.
In sum, the present invention utilizes the different mode of operation of photovoltaic DC-to-AC converter, by the detection of photovoltaic voltage and right
The control of power output, completes the switching of various patterns, controls photovoltaic DC-to-AC converter well when photovoltaic array power is less
Startup, it is to avoid because of the problem of the less repeated switching of power.
The present invention is described according to specific embodiment, but it will be understood by those skilled in the art that without departing from this
During bright scope, various change and equivalent can be carried out.Additionally, being the specific occasion adapting to the technology of the present invention, can be to the present invention
Carry out many modifications without deviating from its protection domain.Therefore, the present invention is not limited to specific embodiment disclosed herein, and includes
All embodiments dropping into claims.
Claims (8)
1. a kind of open method of photovoltaic DC-to-AC converter is it is characterised in that comprise the following steps：
S1, control described photovoltaic DC-to-AC converter to be operated in rectifier pattern after described photovoltaic DC-to-AC converter AC soft starting, and control
The bus voltage value of rectification reaches the photovoltaic voltage value of photovoltaic battery array；
S2, the described photovoltaic DC-to-AC converter of control are operated in active reactive pattern, and are stepped up the output work of described photovoltaic DC-to-AC converter
Blunt to reaching default power output；
S3, the described photovoltaic DC-to-AC converter of control are operated in maximal power tracing pattern；
Detect the photovoltaic voltage value of current photovoltaic battery array in described step S2, described photovoltaic DC-to-AC converter is increased with the first step-length
Power output, and when detecting that current photovoltaic voltage value is increased to the photovoltaic voltage value before increasing power output, continue with the
One step-length increases the power output of described photovoltaic DC-to-AC converter, once increases output work detecting before current photovoltaic voltage value is increased to
During photovoltaic voltage value after rate, continue to increase the power output of photovoltaic DC-to-AC converter with the first step-length, until it reaches default output work
Rate.
2. the open method of photovoltaic DC-to-AC converter according to claim 1 is it is characterised in that the first step-length in described step S2
For 0.5kw to 2kw.
3. the open method of photovoltaic DC-to-AC converter according to claim 2 is it is characterised in that the first step-length in described step S2
For 1kw.
4. the open method of photovoltaic DC-to-AC converter according to claim 1 is it is characterised in that default in described step S2 export
Power is the 101% to 105% of described photovoltaic DC-to-AC converter rated power.
5. a kind of open system of photovoltaic DC-to-AC converter is it is characterised in that include：
First control unit, for controlling described photovoltaic DC-to-AC converter to be operated in rectification after described photovoltaic DC-to-AC converter AC soft starting
Device pattern, and control the bus voltage value of rectification to reach the photovoltaic voltage value of photovoltaic battery array；
Second control unit, for controlling described photovoltaic DC-to-AC converter to be operated in active reactive pattern, and is stepped up described photovoltaic
The power output of inverter is until reach default power output；
3rd control unit, for controlling described photovoltaic DC-to-AC converter to be operated in maximal power tracing pattern；
Described second control unit detects the photovoltaic voltage value of current photovoltaic battery array, increases described photovoltaic with the first step-length inverse
Become the power output of device, and when detecting that current photovoltaic voltage value is increased to the photovoltaic voltage value before increasing power output, continue
Increase the power output of described photovoltaic DC-to-AC converter with the first step-length, once increase defeated before the current photovoltaic voltage value of detection is increased to
When going out the photovoltaic voltage value after power, continue to increase the power output of photovoltaic DC-to-AC converter with the first step-length, until it reaches default defeated
Go out power.
6. the open system of photovoltaic DC-to-AC converter according to claim 5 is it is characterised in that a length of 0.5kw of the described first step
To 2kw.
7. the open system of photovoltaic DC-to-AC converter according to claim 6 is it is characterised in that a length of 1kw of the described first step.
8. the open system of photovoltaic DC-to-AC converter according to claim 5 is it is characterised in that described default power output is institute
State the 101% to 105% of photovoltaic DC-to-AC converter rated power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410385429.7A CN104283412B (en) | 2014-08-07 | 2014-08-07 | Photovoltaic inverter starting method and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410385429.7A CN104283412B (en) | 2014-08-07 | 2014-08-07 | Photovoltaic inverter starting method and system |
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| Publication Number | Publication Date |
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| CN104283412A CN104283412A (en) | 2015-01-14 |
| CN104283412B true CN104283412B (en) | 2017-02-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2325984A1 (en) * | 2009-11-24 | 2011-05-25 | SMA Solar Technology AG | Start up of a photovoltiac field with high open circuit voltage |
| CN102214932B (en) * | 2011-06-09 | 2013-03-06 | 电子科技大学 | Method for distributing active power of wind-light storage transmission comprehensive power station |
| CN102843022A (en) * | 2011-06-23 | 2012-12-26 | 深圳市汇川技术股份有限公司 | System and method for suppressing repeat start of photovoltaic inverter |
| DE102011121197B4 (en) * | 2011-12-16 | 2013-08-22 | Sma Solar Technology Ag | Procedure for commissioning an inverter and inverter |
| CN103227561B (en) * | 2013-04-12 | 2016-05-25 | 深圳市汇川技术股份有限公司 | Photovoltaic DC-to-AC converter starting drive and method |
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