CN108322023A - A kind of photovoltaic combining inverter resonance suppression circuit and its suppressing method - Google Patents
A kind of photovoltaic combining inverter resonance suppression circuit and its suppressing method Download PDFInfo
- Publication number
- CN108322023A CN108322023A CN201810231778.1A CN201810231778A CN108322023A CN 108322023 A CN108322023 A CN 108322023A CN 201810231778 A CN201810231778 A CN 201810231778A CN 108322023 A CN108322023 A CN 108322023A
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- Prior art keywords
- inversion unit
- circuit
- photovoltaic combining
- filter circuit
- combining inverter
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- 230000001629 suppression Effects 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims description 9
- 238000013016 damping Methods 0.000 claims abstract description 29
- 238000010248 power generation Methods 0.000 claims abstract description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 230000002401 inhibitory effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H02J3/383—
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
A kind of photovoltaic combining inverter resonance suppression circuit, including DC source and the inversion unit that is connected with DC source, inversion unit connect AC network by ac filter circuit；Setting has no chance damping circuit and its control switch in the ac filter circuit, and inversion unit connect control system with modulate circuit by signal acquisition, and control system output control signal is separately connected inversion unit and is switched with control.Sources PV that the DC source is constituted using solar panel or other can be used in the DC source of DC power generation system.When resonance occurs for inversion unit, control system adjusting control switch cut-offs to change the working condition of damping circuit for no reason at all, to change the impedance operator of ac filter circuit, finally so that ac filter circuit carries out inhibiting even to be eliminated resonance when resonance occurs for inversion unit in time.The circuit topological structure of the present invention is simple, is easy to implement.
Description
Technical field
The present invention relates to power electronics field, specially a kind of photovoltaic combining inverter resonance suppression circuit and its suppression
Method processed.
Background technology
With the continuous development of energy demand and power electronic technique, the grid connection capacity of photovoltaic plant is continuously improved, this is just
So that large-sized photovoltaic power station meets increasingly increased grid connection capacity using a kind of topology of photovoltaic combining inverter multi-machine parallel connection
Demand.
Simultaneously because the trend of market development, string type photovoltaic combining inverter is a dark horse, in different application scenarios,
String type photovoltaic combining inverter is also grid-connected to carry out through the system structure frequently with multi-inverter parallel.
In said structure, the system composition of multi-machine parallel connection, single inverter are often returned using the master of no isolating transformer
Road topology, filtering link mostly use the LCL filter of mainstream.Compare LC filters, and LCL filter design can be introduced to system
More resonant frequency points, in the case of multi-machine parallel connection, because without isolating transformer, the direct parallel connection of filter circuit so that be
The resonant network of system complicates.In actual operation, the probability of above-mentioned multi-machine parallel connection system generation resonance greatly increases.
Resonance leverages the safety and stability of electric system, seriously restricts photovoltaic combining inverter
Engineer application and popularization.For the resonance problems for how solving multi-machine parallel connection photovoltaic combining inverter, current major Research Center
Institute, institution of higher learning, enterprise and relevant unit are all carrying out thoroughgoing and painstaking research and analysis.
Invention content
It is an object of the invention to the problems in for the above-mentioned prior art, provide a kind of photovoltaic combining inverter resonance suppression
Circuit and its suppressing method processed, circuit topology is simple, is easy to implement, and has practical engineering value.
To achieve the goals above, the technical solution that photovoltaic combining inverter resonance suppression circuit of the present invention uses for：
The inversion unit being connected including DC source and with DC source, inversion unit is by ac filter circuit connection exchange
Power grid；In the ac filter circuit setting have no chance damping circuit and its control switch, inversion unit by signal acquisition with
Modulate circuit connects control system, and control system output control signal is separately connected inversion unit and is switched with control.
The DC source using solar panel constitute the sources PV or other can be used in DC power generation system
DC source.
The inversion unit uses single-phase inverter or three-phase inverter.
The AC network is single phase ac power grid or three-phase AC grid.
The ac filter circuit uses the filter circuit that topology is LC for the filter circuit of LCL or topology.
The damping circuit for no reason at all includes damping resistance, and control switch is in parallel with damping resistance.
The present invention is based on the suppressing methods of photovoltaic combining inverter resonance suppression circuit, including：
When inversion unit works normally, direct current energy is converted into AC energy by inversion unit, by ac filter circuit
It is incorporated to AC network, damping circuit includes damping resistance for no reason at all, and control switch is in parallel with damping resistance, and control switch closes at this time
It closes, damping resistance is bypassed；When resonance occurs for inversion unit, first by signal acquisition and modulate circuit by abnormal voltage,
Current signal is transmitted to control system, and control system passes through condition adjudgement, however, it is determined that inversion unit is in resonant condition, is opened to control
Pass issues open command, and after control switch disconnects, damping resistance puts into ac filter circuit and starts to work, due to ac filter
The impedance operator of circuit changes, and the resonance of inversion unit is inhibited or eliminates.
Compared with prior art, the present invention has following advantageous effect：Setting damps back for no reason at all in ac filter circuit
Road and its control switch, inversion unit connect control system, control system output control letter with modulate circuit by signal acquisition
Inversion unit number is separately connected to switch with control, when resonance occurs for inversion unit, control system adjusting control switch is cut-off,
Change the working condition of damping circuit for no reason at all, to changing the impedance operator of ac filter circuit, finally so that ac filter
Circuit carries out inhibiting even to be eliminated resonance when resonance occurs for inversion unit in time.The circuit topological structure letter of the present invention
It is single, it is easy to implement, there is practical engineering value, provide the solution of multi-machine parallel connection photovoltaic combining inverter resonance inhibition.
Description of the drawings
Using the operation mode schematic diagram of LC ac filter circuits when Fig. 1 inversion units work normally；
Using the operation mode schematic diagram of LCL ac filter circuits when Fig. 2 inversion units work normally；
Using the operation mode schematic diagram of LC ac filter circuits when Fig. 3 inversion units generation resonance；
Using the operation mode schematic diagram of LCL ac filter circuits when Fig. 4 inversion units generation resonance；
In attached drawing：1- DC sources；2- inversion units；3- AC networks；4- signal acquisitions and modulate circuit；5- controls system
System.
Specific implementation mode
Present invention will be described in further detail below with reference to the accompanying drawings.
Photovoltaic combining inverter resonance suppression circuit of the present invention, including DC source 1 and the inversion list that is connected with DC source 1
Member 2, inversion unit 2 connect AC network 3 by ac filter circuit；In ac filter circuit setting have no chance damping circuit and its
Switch K is controlled, inversion unit 2 connect control system 5, the output control signal of control system 5 with modulate circuit 4 by signal acquisition
It is separately connected inversion unit 2 and control switch K.Wherein, damping circuit includes damping resistance R for no reason at all, control switch K and damping electricity
It is in parallel to hinder R.Sources PV that DC source 1 is constituted using solar panel or other can be used in the direct current of DC power generation system
Source.Inversion unit 2 uses single-phase inverter or three-phase inverter.AC network 3 is single phase ac power grid or three-phase alternating current
Power grid.Ac filter circuit uses the filter circuit that topology is LC for the filter circuit of LCL or topology.
Referring to Fig. 1-2, when inversion unit 2 works normally, direct current energy is converted into AC energy by inversion unit 2, is passed through
Ac filter circuit is incorporated to AC network 3, controls switch K at this time and is closed, damping resistance R is bypassed.
It, first will be abnormal electric by signal acquisition and modulate circuit 4 when resonance occurs for inversion unit 2 referring to Fig. 3-4
Pressure, current signal are transmitted to control system 5, and control system 5 passes through condition adjudgement, however, it is determined that inversion unit 2 is in resonant condition, gives
Control switch K issues open command, and after control switch K is disconnected, damping resistance R input ac filter circuits are started to work, by
Change in the impedance operator of ac filter circuit, the resonance of inversion unit 2 is inhibited or eliminates.
When the present invention implements, by detecting the voltage of inverter output in real time, voltage and electricity is calculated in the magnitude of current
Waveform is flowed, judges whether system occurs resonance with this.Using solar panel (sources PV) or DC source, direct current output
Just, the direct current input of the negative access inverter of direct current output is negative for the direct current input of positive access inverter.Inverter ac exports bridge
Then mouth side or phase line side meet filter reactor L, the other side of filter reactor L connects first by voltage, current sampling circuit
Filter capacitor C and simultaneously net side reactance L ', and the other end incoming transport power grid of net side reactance L '.For using LC filter circuits
For inverter circuit, and net side reactance L ' is not present, therefore the other side of filter reactor L meets filter capacitor C later directly simultaneously
Enter AC network.Another termination damping resistance R of filter capacitor C, damping resistance R the other end connection inverter neutral side or
Neutral point side N, is then incorporated into AC network, and the both ends of damping resistance R are parallel with control switch K.Inverter ac exports bridge mouth
After side or phase line side are by voltage, current sampling circuit, sample obtained signal and pass through signal conditioning circuit, subsequently into control
System 5 processed.The output signal of control system 5 respectively enters inverter and control switch K.
Above describe the basic principle and implementation method of the present invention, in specific implementation process can be it is various,
It does not depart from the simple transformation carried out in the range of the basic principle and implementation of the present invention and optimization belongs to the guarantor of the present invention
Protect range.
Claims (7)
1. a kind of photovoltaic combining inverter resonance suppression circuit, it is characterised in that：Including DC source (1) and with DC source (1)
Connected inversion unit (2), inversion unit (2) is by ac filter circuit connection AC network (3)；The ac filter electricity
Setting has no chance damping circuit in road and its control switch (K), inversion unit (2) are connect by signal acquisition with modulate circuit (4)
Control system (5), control system (5) output control signal are separately connected inversion unit (2) and control switch (K).
2. photovoltaic combining inverter resonance suppression circuit according to claim 1, it is characterised in that：The DC source
(1) sources PV that solar panel is constituted or other is used to can be used in the DC source of DC power generation system.
3. photovoltaic combining inverter resonance suppression circuit according to claim 1, it is characterised in that：The inversion unit
(2) single-phase inverter or three-phase inverter are used.
4. photovoltaic combining inverter resonance suppression circuit according to claim 3, it is characterised in that：The AC network
(3) it is single phase ac power grid or three-phase AC grid.
5. photovoltaic combining inverter resonance suppression circuit according to claim 1, it is characterised in that：The ac filter
Circuit uses the filter circuit that topology is LC for the filter circuit of LCL or topology.
6. photovoltaic combining inverter resonance suppression circuit according to claim 1, it is characterised in that：Described damps for no reason at all
Circuit includes damping resistance (R), and control switch (K) is in parallel with damping resistance (R).
7. a kind of suppression based on photovoltaic combining inverter resonance suppression circuit described in any one of claim 1-6 claims
Method processed, which is characterized in that including：When inversion unit (2) works normally, direct current energy is converted into exchanging by inversion unit (2)
Electric energy is incorporated to AC network (3) by ac filter circuit, and damping circuit includes damping resistance (R) for no reason at all, control switch (K)
In parallel with damping resistance (R), control switch (K) is closed at this time, and damping resistance (R) is bypassed；
When resonance occurs for inversion unit (2), first by signal acquisition and modulate circuit (4) by abnormal voltage, current signal
It is transmitted to control system (5), control system (5) passes through condition adjudgement, however, it is determined that inversion unit (2) is in resonant condition, to control
Switch (K) issues open command, and after control switch (K) disconnects, damping resistance (R) puts into ac filter circuit and starts to work,
Since the impedance operator of ac filter circuit changes, the resonance of inversion unit (2) is inhibited or eliminates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810231778.1A CN108322023A (en) | 2018-03-20 | 2018-03-20 | A kind of photovoltaic combining inverter resonance suppression circuit and its suppressing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810231778.1A CN108322023A (en) | 2018-03-20 | 2018-03-20 | A kind of photovoltaic combining inverter resonance suppression circuit and its suppressing method |
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| Publication Number | Publication Date |
|---|---|
| CN108322023A true CN108322023A (en) | 2018-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810231778.1A Pending CN108322023A (en) | 2018-03-20 | 2018-03-20 | A kind of photovoltaic combining inverter resonance suppression circuit and its suppressing method |
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| CN (1) | CN108322023A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111682579A (en) * | 2020-05-09 | 2020-09-18 | 杭州电子科技大学 | Single-phase harmonic resonance optimization suppression device and suppression method |
Citations (6)
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|---|---|---|---|---|
| CN101010865A (en) * | 2004-09-08 | 2007-08-01 | 大金工业株式会社 | Polyphase current supplying circuit and driver apparatus |
| CN101714826A (en) * | 2004-12-09 | 2010-05-26 | 大金工业株式会社 | Multi-phase current supplying circuit, driving apparatus, compressor, and air conditioner |
| CN102655369A (en) * | 2011-03-04 | 2012-09-05 | 株式会社电装 | Power conversion apparatus |
| CN104124859A (en) * | 2014-07-01 | 2014-10-29 | 特变电工新疆新能源股份有限公司 | Grid-connected current harmonic suppression circuit and method for photovoltaic grid-connected inverter |
| WO2017061192A1 (en) * | 2015-10-06 | 2017-04-13 | 株式会社村田製作所 | Power receiving device |
| TW201737616A (en) * | 2016-04-11 | 2017-10-16 | 聯發科技股份有限公司 | Oscillator circuit with reconfigurable oscillator amplifier and/or hybrid amplitude calibration circuit and associated method |
-
2018
- 2018-03-20 CN CN201810231778.1A patent/CN108322023A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101010865A (en) * | 2004-09-08 | 2007-08-01 | 大金工业株式会社 | Polyphase current supplying circuit and driver apparatus |
| CN101714826A (en) * | 2004-12-09 | 2010-05-26 | 大金工业株式会社 | Multi-phase current supplying circuit, driving apparatus, compressor, and air conditioner |
| CN102655369A (en) * | 2011-03-04 | 2012-09-05 | 株式会社电装 | Power conversion apparatus |
| CN104124859A (en) * | 2014-07-01 | 2014-10-29 | 特变电工新疆新能源股份有限公司 | Grid-connected current harmonic suppression circuit and method for photovoltaic grid-connected inverter |
| WO2017061192A1 (en) * | 2015-10-06 | 2017-04-13 | 株式会社村田製作所 | Power receiving device |
| TW201737616A (en) * | 2016-04-11 | 2017-10-16 | 聯發科技股份有限公司 | Oscillator circuit with reconfigurable oscillator amplifier and/or hybrid amplitude calibration circuit and associated method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111682579A (en) * | 2020-05-09 | 2020-09-18 | 杭州电子科技大学 | Single-phase harmonic resonance optimization suppression device and suppression method |
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Application publication date: 20180724 |