CN108288920A - The method for inhibiting photovoltaic combining inverter DC bus-bar voltage secondary ripple wave to influence MPPT - Google Patents
The method for inhibiting photovoltaic combining inverter DC bus-bar voltage secondary ripple wave to influence MPPT Download PDFInfo
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- CN108288920A CN108288920A CN201711400524.XA CN201711400524A CN108288920A CN 108288920 A CN108288920 A CN 108288920A CN 201711400524 A CN201711400524 A CN 201711400524A CN 108288920 A CN108288920 A CN 108288920A
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- 238000012545 processing Methods 0.000 claims abstract description 7
- 230000005540 biological transmission Effects 0.000 claims description 9
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H02J3/385—
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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
- H02M1/14—Arrangements for reducing ripples from dc input or output
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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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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Dc-Dc Converters (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention discloses a kind of methods that inhibition photovoltaic combining inverter DC bus-bar voltage secondary ripple wave influences MPPT, sample photovoltaic cell panel output voltage and output current, it obtains DC reference voltage and makees input of the difference as PI controllers 1 with input voltage is surveyed, adjusting obtains inductive current reference value and actual measurement inductive current work is poor, and error output signal is obtained by PI controllers 2；Processing DC bus-bar voltage obtains busbar secondary ripple wave fluctuation voltage, it is added with error output signal by feedforward controller, it finally obtains pwm pulse and controls signal, by driving circuit come driving switch pipe, realize the control to input voltage, inductive current secondary ripple wave.The present invention passes through MPPT controller, the cooperation of Boost controllers, feedforward controller and PWM controller, eliminate influence of the secondary power disturbance to DC input voitage and inductive current, improve MPPT control performances, dc-link capacitance need not be increased, to keep equipment volume smaller, cost lower.
Description
Technical field
The present invention relates to parallel network power generation technology field more particularly to a kind of direct current inhibiting photovoltaic combining inverter are female
The method that line voltage (BUS voltages) secondary ripple wave influences MPPT (MPPT maximum power point tracking).
Background technology
Two-stage type photovoltaic combining inverter is made of prime Boost and rear class net side inverter, relative to based on
For rear class net side inverter MPPT control programs, the control program front stage of the MPPT based on prime Boost couples
The high and modularized design convenient for system of small, control accuracy and it is integrated the advantages that, therefore be widely used.For single-phase inverter
For, instantaneous output is pulsed with twice of power frequency, and DC bus-bar voltage is caused to have secondary ripple wave, serious secondary ripple wave problem
It can influence MPPT controls.To improve the control performance of MPPT, usually inhibit secondary ripple wave by increasing dc-link capacitance.But
The method can increase the cost of equipment, meanwhile, the bus capacitor of bigger can also increase the volume of equipment.Therefore one kind is needed not increase
Oil (gas) filling device cost and volume can improve the scheme of MPPT control performances.
Invention content
The present invention in view of the drawbacks of the prior art, when providing intrinsic secondary ripple wave in a kind of busbar voltage, is not increasing mother
Under the premise of line capacitance, the inhibition photovoltaic combining inverter DC bus-bar voltage secondary ripple wave pair of MPPT control performances can be improved
The method that MPPT influences.
In order to solve the above technical problems, the present invention adopts the following technical scheme that：Inhibit photovoltaic combining inverter DC bus
The method that voltage secondary ripple wave influences MPPT, it is characterised in that：Its control system framework includes MPPT controller, Boost controls
Device, DC bus-bar voltage feedforward controller and PWM drive modules processed, Boost controllers include PI controllers 1 and PI controllers 2,
It is as follows,
1), the output voltage u of sampling photovoltaic battery panel PVPVWith output current iPV, obtain two parameters are sent into MPPT
Controller obtains DC reference voltage UrefAs negative terminal；
2), DC reference voltage UrefWith actual measurement input voltage uPVMake poor, input of the difference as PI controllers 1, PI controls
Device 1 processed is adjusted in real time obtains the reference value I of inductive currentref, the reference value I of inductive currentrefAs anode, with actual measurement inductance electricity
Flow iLIt is poor to make, which obtains error output signal by PI controllers 2；
3) DC bus-bar voltage, is sampled, processing obtains busbar secondary ripple wave fluctuation voltage vBUS, feedover by busbar voltage
Controller is added with the error output signal described in step 2), obtains the output signal of Boost controllers；
4) it using the output signal of Boost controllers as modulated signal, is obtained compared with triangular carrier according to modulated signal
The pwm pulse of Boost circuit must be driven to control signal, the control signal is by driving circuit come driving switch pipe T5, realization pair
The control of input voltage, inductive current secondary ripple wave.
Preferably, the switch transistor T 5 is insulated gate bipolar transistor IGBT.
Further, the implementation process of step 2) is that Boost controllers inner ring is to photovoltaic input current iPVIt controls, closes
It is that formula is as follows：
In the control structure of the MPPT control systems based on prime Boost, including following parameter, Gc1 (s) are
The transmission function of PI controllers 1, Gc2 (s) are the transmission function of PI controllers 2；G1 (s), G2 (s) and G3 (s) are by control planning
Formula decomposes to obtain, and wherein G1 (s) * G2 (s)=Ga (s), G3 (s) * G2 (s)=Gb (s), G4 (s) are inverter input voltage uPV
With output current iPVRelationship；H1 (s) and H2 (s) is respectively the sampling function of input voltage and input current；
DC reference voltage UrefWith actual measurement input voltage uPVMake poor, input of the difference as PI controllers 1, PI controls
Device 1 adjusts obtain the reference value I of inductive current in real timeref, the reference value I of inducing currentrefAs anode, with actual measurement inductive current iL
It is poor to make, which obtains error output signal by PI controllers 2；
The implementation process of step 3) is to sample DC bus-bar voltage, and processing obtains busbar secondary ripple wave fluctuation voltage vBUS,
It is added with the error output signal by busbar voltage feedforward controller, obtains the output signal of Boost controllers, busbar electricity
It is G3 (s)/G2 (s) to press the transmission function of feedforward controller.
Compared with prior art, the present invention passes through single-phase photovoltaic MPPT controller, Boost controllers, DC bus-bar voltage
The cooperation of feedforward controller and PWM controller (drive module) eliminates secondary power disturbance to DC input voitage and inductance
The influence of electric current is effectively improved the control performance of MPPT, and implementation is simple, easy to control, with obvious effects；And it is not required to
Additionally to increase dc-link capacitance, and so that system bulk reduction, cost reduction.
Description of the drawings
Fig. 1 is the single-phase two-stage type photovoltaic combining inverter main circuit schematic diagram of transless of the prior art；
Fig. 2 is Control system architecture block diagram of the present invention；
Fig. 3 is that the present invention is based on the control block diagrams of the MPPT control systems of prime Boost；
Fig. 4 is input voltage, the inductive current secondary ripple wave figure of the prior art；
Fig. 5 is the input voltage of the present invention, inductive current secondary ripple wave figure.
Specific implementation mode
It is the single-phase main electricity of two-stage type photovoltaic combining inverter of transless of the prior art as shown in Figure 1 in the present embodiment
Road, the present invention are substantially carried out it improvement of control method, realize to photovoltaic DC-to-AC converter input voltage, inductive current secondary ripple wave
Inhibition.
With reference to Fig. 2, the method for inhibiting photovoltaic combining inverter DC bus-bar voltage secondary ripple wave to influence MPPT,
Control system framework includes MPPT controller, Boost controllers, DC bus-bar voltage feedforward controller and PWM drive modules,
Boost controllers include PI controllers 1 and PI controllers 2, are as follows,
1), the output voltage u of sampling photovoltaic battery panel PVPVWith output current iPV, obtain two parameters are sent into MPPT
Controller obtains DC reference voltage UrefAs negative terminal；
2), DC reference voltage UrefWith actual measurement input voltage uPVMake poor, input of the difference as PI controllers 1, PI controls
Device 1 processed is adjusted in real time obtains the reference value I of inductive currentref, the reference value I of inductive currentrefAs anode, with actual measurement inductance electricity
Flow iLIt is poor to make, which obtains error output signal by PI controllers 2；
3) DC bus-bar voltage, is sampled, processing obtains busbar secondary ripple wave fluctuation voltage vBUS, feedover by busbar voltage
Controller is added with the error output signal described in step 2), obtains the output signal of Boost controllers；
4) it using the output signal of Boost controllers as modulated signal, is obtained compared with triangular carrier according to modulated signal
The pwm pulse of Boost circuit must be driven to control signal, the control signal is by driving circuit come driving switch pipe T5, realization pair
The control of input voltage, inductive current secondary ripple wave.
The switch transistor T 5 is insulated gate bipolar transistor IGBT.
Boost controllers inner ring is to photovoltaic input current iPVIt controls, relational expression is as follows：
In the control structure of the MPPT control systems based on prime Boost, as shown in figure 3, including following ginseng
Number, Gc1 (s) are the transmission function of PI controllers 1, and Gc2 (s) is the transmission function of PI controllers 2；G1 (s), G2 (s) and G3 (s)
It decomposes to obtain by control relationship, wherein G1 (s) * G2 (s)=Ga (s), G3 (s) * G2 (s)=Gb (s), G4 (s) are inverter
Input voltage uPVWith output current iPVRelationship；H1 (s) and H2 (s) is respectively the sampling function of input voltage and input current；
DC reference voltage UrefWith actual measurement input voltage uPVMake poor, input of the difference as PI controllers 1, PI controls
Device 1 adjusts obtain the reference value I of inductive current in real timeref, the reference value I of inducing currentrefAs anode, with actual measurement inductive current iL
It is poor to make, which obtains error output signal by PI controllers 2；
DC bus-bar voltage is sampled, processing obtains busbar secondary ripple wave fluctuation voltage vBUS, by busbar voltage feedforward control
Device is added with the error output signal, obtains the output signal of Boost controllers, the transmission letter of busbar voltage feedforward controller
Number is G3 (s)/G2 (s).
As shown in Figure 4 and Figure 5, in figure waveform acquisition power be 2kW, input voltage and busbar voltage because voltage value compared with
Height, for convenience of comparing, the alternating component adopted with oscillograph " AC couplings " mode, with input voltage, inductive current without the present invention
Secondary ripple wave compared (i.e. shown in Fig. 4), after suppressing method using the present invention, secondary ripple wave substantially eliminates, such as Fig. 5.
The present invention is described in detail above, described above, only the preferred embodiments of the invention, when cannot
Limit the application practical range, i.e., it is all according to the made equivalent changes and modifications of the application range, it all should still belong to covering scope of the present invention
It is interior.
Claims (3)
1. the method for inhibiting photovoltaic combining inverter DC bus-bar voltage secondary ripple wave to influence MPPT, it is characterised in that：It is controlled
System architecture processed includes MPPT controller, Boost controllers, DC bus-bar voltage feedforward controller and PWM drive modules,
Boost controllers include PI controllers 1 and PI controllers 2, are as follows,
1), the output voltage u of sampling photovoltaic battery panel PVPVWith output current iPV, obtain two parameters are sent into MPPT controls
Device obtains DC reference voltage UrefAs negative terminal；
2), DC reference voltage UrefWith actual measurement input voltage uPVMake poor, input of the difference as PI controllers 1, PI controllers
1 adjusting in real time obtains the reference value I of inductive currentref, the reference value I of inductive currentrefAs anode, with actual measurement inductive current iL
It is poor to make, which obtains error output signal by PI controllers 2；
3) DC bus-bar voltage, is sampled, processing obtains busbar secondary ripple wave fluctuation voltage vBUS, by busbar voltage feedforward control
Device is added with the error output signal described in step 2), obtains the output signal of Boost controllers；
4) it using the output signal of Boost controllers as modulated signal, is driven compared with triangular carrier according to modulated signal
The pwm pulse of dynamic Boost circuit controls signal, which, come driving switch pipe T5, is realized to input by driving circuit
The control of voltage, inductive current secondary ripple wave.
2. the side according to claim 1 for inhibiting photovoltaic combining inverter DC bus-bar voltage secondary ripple wave to influence MPPT
Method, it is characterised in that：The switch transistor T 5 is insulated gate bipolar transistor.
3. the side according to claim 1 for inhibiting photovoltaic combining inverter DC bus-bar voltage secondary ripple wave to influence MPPT
Method, it is characterised in that：The implementation process of step 2) is that Boost controllers inner ring is to photovoltaic input current iPVIt controls, relational expression
It is as follows：
In the control structure of the MPPT control systems based on prime Boost, including following parameter, Gc1 (s) are controlled for PI
The transmission function of device 1 processed, Gc2 (s) are the transmission function of PI controllers 2；G1 (s), G2 (s) and G3 (s) are by control relationship point
Solution obtains, and wherein G1 (s) * G2 (s)=Ga (s), G3 (s) * G2 (s)=Gb (s), G4 (s) are inverter input voltage uPVWith it is defeated
Go out electric current iPVRelationship；H1 (s) and H2 (s) is respectively the sampling function of input voltage and input current；
DC reference voltage UrefWith actual measurement input voltage uPVMake poor, input of the difference as PI controllers 1, PI controllers 1 are real
When adjust to obtain the reference value I of inductive currentref, the reference value I of inducing currentrefAs anode, with actual measurement inductive current iLIt is poor to make,
The difference obtains error output signal by PI controllers 2；
The implementation process of step 3) is to sample DC bus-bar voltage, and processing obtains busbar secondary ripple wave fluctuation voltage vBUS, pass through
Busbar voltage feedforward controller is added with the error output signal, obtains the output signal of Boost controllers, before busbar voltage
The transmission function for presenting controller is G3 (s)/G2 (s).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109327153A (en) * | 2018-10-15 | 2019-02-12 | 四川长虹电器股份有限公司 | The single-phase off-network inverter control method of photovoltaic |
| CN109347331A (en) * | 2018-12-05 | 2019-02-15 | 深圳市英可瑞科技股份有限公司 | A kind of tri-level switch power-supply system and its bus voltage eqaulation control method |
| CN110350530A (en) * | 2019-06-26 | 2019-10-18 | 华中科技大学 | A kind of active stabilization device and method of direct-current grid high order ripple |
| CN113162108A (en) * | 2021-01-20 | 2021-07-23 | 苏州海鹏科技有限公司 | Method for improving load limiting stability of inverter |
-
2017
- 2017-12-22 CN CN201711400524.XA patent/CN108288920A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109327153A (en) * | 2018-10-15 | 2019-02-12 | 四川长虹电器股份有限公司 | The single-phase off-network inverter control method of photovoltaic |
| CN109347331A (en) * | 2018-12-05 | 2019-02-15 | 深圳市英可瑞科技股份有限公司 | A kind of tri-level switch power-supply system and its bus voltage eqaulation control method |
| CN110350530A (en) * | 2019-06-26 | 2019-10-18 | 华中科技大学 | A kind of active stabilization device and method of direct-current grid high order ripple |
| CN113162108A (en) * | 2021-01-20 | 2021-07-23 | 苏州海鹏科技有限公司 | Method for improving load limiting stability of inverter |
| CN113162108B (en) * | 2021-01-20 | 2023-11-21 | 苏州海鹏科技有限公司 | Method for improving load limiting stability of inverter |
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Application publication date: 20180717 |