CN109327153A - The single-phase off-network inverter control method of photovoltaic - Google Patents
The single-phase off-network inverter control method of photovoltaic Download PDFInfo
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- CN109327153A CN109327153A CN201811197278.7A CN201811197278A CN109327153A CN 109327153 A CN109327153 A CN 109327153A CN 201811197278 A CN201811197278 A CN 201811197278A CN 109327153 A CN109327153 A CN 109327153A
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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
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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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 technical field of photovoltaic power generation, and the dynamic response capability and stable state accuracy requirement of system, and the technical problem that technology is relative complex cannot be taken into account by solving existing photovoltaic off-grid inverter.The present invention includes DC-DC double -loop control module and DC-AC three close-loop control module, the method controlled using the bicyclic PI and DC-AC tricyclic proportional integration of DC-DC and ratio, the advantages of remaining the easy to accomplish of PI, high robust and quick response, simultaneously again because adding instantaneous value tricyclic using virtual value, achieve the purpose that eliminate sine wave stable state static difference, it is able to maintain higher stable state accuracy again while effective lifting system dynamic response capability, to effectively improve the reliability of inverter system.The present invention is especially suitable for the single-phase off-network inverters of photovoltaic.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, the in particular to single-phase off-network technical field of inverter control of photovoltaic.
Background technique
Photovoltaic off-grid inversion system needs to switch to luminous energy AC energy and uses for load.Two-stage type photovoltaic off-grid inverter
Comprising DC-DC module and DC-AC module two parts, the former is DC converter, is the low dc voltage for exporting photovoltaic array
Higher DC bus-bar voltage is risen to, or DC voltage needed for being down to energy-storage battery group, the latter is to realize direct current to exchanging
Inverter.
Existing photovoltaic off-grid inverter, common control method have PI (proportional integration), PR (resonance), synovial membrane and repeat to control
System, structure is generally voltage monocycle or voltage and current is bicyclic.PI algorithm is simple, but simple monocycle or bicyclic PI can not accurately with
The steady-state error of track time-varying sinusoidal signal；PR has good steady-state characteristic, but every kind of harmonic wave is needed all to set a PR controller, develops
Higher cost；Synovial membrane control need to establish accurate system model to obtain synovial membrane surface function and control domain, and technology is relative complex；Weight
Multiple control can only postpone a cycle and generate control amount, bad dynamic performance.Therefore existing control method, exists to take into account and is
Dynamic response capability and the stable state accuracy requirement of system, and the problem that technology is relative complex.
Summary of the invention
The present invention is that the existing photovoltaic off-grid inverter of solution cannot take into account the dynamic response capability of system and stable state accuracy is wanted
It asks, and the technical problem that technology is relative complex, a kind of single-phase off-network inverter control method of photovoltaic is provided.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: the single-phase off-network inverter control method of photovoltaic,
Applied to the single-phase off-network inverter of photovoltaic, the single-phase off-network inverter of photovoltaic includes signal acquisition module, DC-DC module, DC-
AC module, DC-DC double -loop control module and DC-AC three close-loop control module, the DC-DC module and DC-AC module pass through direct current
Bus connection, the signal acquisition module acquire the current feedback of the voltage feedback value of photovoltaic panel output, photovoltaic panel output in real time
The single-phase inversion full-bridge two of value, the inductive current of DC-DC module, DC bus-bar voltage, load voltage and DC-AC module is to bridge arm
Electric current；
The processing method of the DC-DC double -loop control module the following steps are included:
Step 1: the current feedback values of voltage feedback value and photovoltaic panel output to photovoltaic panel output carry out at mean filter
After reason, it is sent into MPPT maximum power point tracking algoritic module, is calculated by disturbance observation or conductance increment and obtains photovoltaic panel Voltage Reference
Value；
Step 2: the voltage feedback value that photovoltaic panel voltage reference value and photovoltaic panel export is sent into the compensation of IIR voltage filter
Module obtains the inductive current reference value of DC-DC module by second order compensation；
Step 3: the inductive current of the inductive current reference value of DC-DC module and DC-DC module is sent into the filter of IIR electric current
Wave compensating module obtains the PWM drive signal of DC-DC booster circuit power tube after carrying out second order compensation and saturation limiting；
Step 4: judging whether DC bus-bar voltage is more than preset threshold value one, one is thened follow the steps if being less than, if super
It crosses, closes MPPT maximum power point tracking algoritic module and enable, then execute step 5；
Step 5: the feedback that DC bus-bar voltage is sent into the outer voltage control module of DC-DC double -loop control module is defeated
Enter end, and obtains preset DC bus-bar voltage steady-state value as the outer voltage control module of DC-DC double -loop control module
Reference value, the outer voltage control module of DC-DC double -loop control module are carried out according to the DC bus-bar voltage and reference value of input
PID compensation calculation obtains the inductive current reference value of DC-DC module；
Step 6: it is bicyclic that the inductive current of the inductive current reference value of DC-DC module and DC-DC module is sent into DC-DC
The current inner loop control module of control module obtains DC-DC booster circuit power tube after carrying out PID compensation and saturation limiting
PWM drive signal；
Cease and desist order Step 7: judging whether to receive, if receive cease and desist order if finishing control process, otherwise execute
Step 5；
The processing method of the DC-AC three close-loop control module the following steps are included:
Step A, judge whether DC bus-bar voltage reaches preset exchange output threshold value, not enabled pair if not up to
The PWM drive signal of the single-phase inversion full bridge power pipe of DC-AC module exports, and enables if reaching to the single-phase of DC-AC module
The PWM drive signal of inversion full bridge power pipe exports；
Step B, the reference value for obtaining preset alternating voltage virtual value is handed over as the outermost layer of DC-AC three close-loop control module
Load voltage is obtained the effective of load voltage through Sinusoid Analysis resume module by the reference value for flowing voltage effective value ring moulds block
Value, and the virtual value of load voltage is sent into the anti-of the outermost layer alternating voltage effective value ring module of DC-AC three close-loop control module
Input terminal is presented, the outermost layer alternating voltage effective value ring module of DC-AC three close-loop control module according to the reference value got and is born
Voltage effective value is carried, the reference value of load voltage virtual value is calculated through proportional integration；
Step C, the standard unit generated the reference value of load voltage virtual value and standard sine wave generation module is sinusoidal
Vector does product calculation, obtains load voltage reference value, and load voltage reference value and load voltage are then sent into DC-AC tricyclic
The voltage middle ring module of control module obtains the reference of the current inner loop module of DC-AC three close-loop control module after ratio calculates
Value；
Step D, DC-AC is sent into after electric current of the single-phase inversion full-bridge two of DC-AC module to bridge arm being carried out calculus of differences
The feedback input end of the current inner loop module of three close-loop control module, then with the current inner loop module of DC-AC three close-loop control module
Reference value carry out ratio calculating, then will ratio calculated result carry out saturation limiting after obtain the single-phase inversion of DC-AC module
The PWM drive signal of full bridge power pipe；
Step E, judge whether to receive to cease and desist order, if receive cease and desist order if finishing control process, otherwise execute
Step A.
As advanced optimizing, the outer voltage control module of DC-DC double -loop control module is set in the step 5
Reference value is gradually increased to preset DC bus-bar voltage steady-state value by 0.By the electricity for being gradually increased DC-DC double -loop control module
The reference value of outer loop control module is pressed, with the heavy current impact for achieving the purpose that soft start, reducing starting moment, member can be protected
Device improves system reliability.
As advanced optimizing, the outermost layer alternating voltage virtual value of DC-AC three close-loop control module is set in the step B
The reference value that the reference value of ring moulds block is gradually increased to preset alternating voltage virtual value by 0.By being gradually increased DC-AC tricyclic
The reference value of the outermost layer alternating voltage effective value ring module of control module, with the big electricity for reaching soft start, reducing starting moment
The purpose for flowing impact can protect component, improve system reliability.
As advanced optimizing, the Sinusoid Analysis module in the step B is by acquiring adjacent voltage over zero twice
Then the instantaneous voltage of period obtains the virtual value of load voltage by root mean square calculation.The above method relatively acquires the complete period
The algorithm of voltage value is faster, is capable of the dynamic response capability of further lifting system.
As advanced optimizing, the signal acquisition module also acquires load current in real time；
In the entire control process of the single-phase off-network inverter of photovoltaic, photovoltaic panel is exported respectively voltage feedback value, light
Lie prostrate the current feedback values of plate output, inductive current, DC bus-bar voltage, load current, load voltage and the DC- of DC-DC module
The single-phase inversion full-bridge two of AC module carries out real-time monitoring to the electric current of bridge arm, and respectively with preset corresponding alarm threshold value and/
Or close driving output threshold value and compare, it judges whether to alarm and/or close driving output accordingly.Pass through real-time monitoring
The voltage and current of system components is realized and carries out under-voltage, overcurrent and overvoltage protection to system multiple portions.
Beneficial effect is: the single-phase off-network inverter control method of photovoltaic of the invention, using DC-DC bicyclic PI and DC-AC
The method of tricyclic proportional integration and ratio control, the advantages of remaining the easy to accomplish of PI, high robust and quick response, simultaneously
Again because adding instantaneous value tricyclic using virtual value, achievees the purpose that eliminate sine wave stable state static difference, be rung in effective lifting system dynamic
It should be able to be able to maintain again higher stable state accuracy while power, to effectively improve the reliability of inverter system.The present invention is special
Suitable for the single-phase off-network inverter of photovoltaic.
Detailed description of the invention
Fig. 1 is the control block diagram of the embodiment of the present invention.
Wherein, Vpv_fbk is the voltage feedback value of photovoltaic panel output, and Ipv_fbk is the current feedback values of photovoltaic panel output,
Iboost_fbk is the inductive current of DC-DC module, and Vbus_fbk is DC bus-bar voltage, and uc_fbk is load voltage, io_
Fbk is load current, and ileg1_fbk and ileg2_fbk are electricity of the single-phase inversion full-bridge two to bridge arm of DC-AC module respectively
Stream, Vpv_ref is photovoltaic panel voltage reference value, and Iboost_ref is the inductive current reference value of DC-DC module, and Vbus_ref is
The reference value of the outer voltage control module of DC-DC double -loop control module, ucrms_ref be DC-AC three close-loop control module most
The reference value of outer layer alternating voltage effective value ring module, uc_rms are the virtual values of load voltage, and uc_ref_dc is load voltage
The reference value of virtual value, uc_ref are load voltage reference values, and ileg_ref is the current inner loop mould of DC-AC three close-loop control module
The reference value of block, PWM1 are the PWM drive signals of DC-DC booster circuit power tube, and PWM2 is that the single-phase inversion of DC-AC module is complete
The PWM drive signal of bridge power tube.
MPPT is MPPT maximum power point tracking algoritic module, and IIR_V is IIR voltage filter compensating module, and IIR_I is IIR electricity
Filtering compensation module is flowed, PID_Vb is the outer voltage control module of DC-DC double -loop control module, and PID_Ib is DC-DC bicyclic
The current inner loop control module of control module, PID_ucrms are the outermost layer alternating voltage virtual values of DC-AC three close-loop control module
Ring moulds block, Sine_Analyze are Sinusoid Analysis modules, and Sine_Gen is standard sine wave generation module, and P_uc is DC-AC
The voltage middle ring module of three close-loop control module, P_ileg are the current inner loop modules of DC-AC three close-loop control module.
Specific embodiment
With reference to the accompanying drawings and examples, technical solution of the present invention is further illustrated.
The technical scheme is that the single-phase off-network inverter control method of photovoltaic, is applied to the single-phase off-network inversion of photovoltaic
Device, the single-phase off-network inverter of photovoltaic include signal acquisition module, DC-DC module, DC-AC module, DC-DC double -loop control mould
Block and DC-AC three close-loop control module, the DC-DC module are connect with DC-AC module by DC bus, the signal acquisition mould
Block acquire in real time photovoltaic panel output voltage feedback value, photovoltaic panel output current feedback values, DC-DC module inductive current,
Electric current of the single-phase inversion full-bridge two of DC bus-bar voltage, load voltage and DC-AC module to bridge arm；
The processing method of the DC-DC double -loop control module the following steps are included:
Step 1: the current feedback values of voltage feedback value and photovoltaic panel output to photovoltaic panel output carry out at mean filter
After reason, it is sent into MPPT maximum power point tracking algoritic module, is calculated by disturbance observation or conductance increment and obtains photovoltaic panel Voltage Reference
Value；
Step 2: the voltage feedback value that photovoltaic panel voltage reference value and photovoltaic panel export is sent into the compensation of IIR voltage filter
Module obtains the inductive current reference value of DC-DC module by second order compensation；
Step 3: the inductive current of the inductive current reference value of DC-DC module and DC-DC module is sent into the filter of IIR electric current
Wave compensating module obtains the PWM drive signal of DC-DC booster circuit power tube after carrying out second order compensation and saturation limiting；
Step 4: judging whether DC bus-bar voltage is more than preset threshold value one, one is thened follow the steps if being less than, if super
It crosses, closes MPPT maximum power point tracking algoritic module and enable, then execute step 5；
Step 5: the feedback that DC bus-bar voltage is sent into the outer voltage control module of DC-DC double -loop control module is defeated
Enter end, and obtains preset DC bus-bar voltage steady-state value as the outer voltage control module of DC-DC double -loop control module
Reference value, the outer voltage control module of DC-DC double -loop control module are carried out according to the DC bus-bar voltage and reference value of input
PID compensation calculation obtains the inductive current reference value of DC-DC module；
Step 6: it is bicyclic that the inductive current of the inductive current reference value of DC-DC module and DC-DC module is sent into DC-DC
The current inner loop control module of control module obtains DC-DC booster circuit power tube after carrying out PID compensation and saturation limiting
PWM drive signal；
Cease and desist order Step 7: judging whether to receive, if receive cease and desist order if finishing control process, otherwise execute
Step 5；
The processing method of the DC-AC three close-loop control module the following steps are included:
Step A, judge whether DC bus-bar voltage reaches preset exchange output threshold value, not enabled pair if not up to
The PWM drive signal of the single-phase inversion full bridge power pipe of DC-AC module exports, and enables if reaching to the single-phase of DC-AC module
The PWM drive signal of inversion full bridge power pipe exports；
Step B, the reference value for obtaining preset alternating voltage virtual value is handed over as the outermost layer of DC-AC three close-loop control module
Load voltage is obtained the effective of load voltage through Sinusoid Analysis resume module by the reference value for flowing voltage effective value ring moulds block
Value, and the virtual value of load voltage is sent into the anti-of the outermost layer alternating voltage effective value ring module of DC-AC three close-loop control module
Input terminal is presented, the outermost layer alternating voltage effective value ring module of DC-AC three close-loop control module according to the reference value got and is born
Voltage effective value is carried, the reference value of load voltage virtual value is calculated through proportional integration；
Step C, the standard unit generated the reference value of load voltage virtual value and standard sine wave generation module is sinusoidal
Vector does product calculation, obtains load voltage reference value, and load voltage reference value and load voltage are then sent into DC-AC tricyclic
The voltage middle ring module of control module obtains the reference of the current inner loop module of DC-AC three close-loop control module after ratio calculates
Value；
Step D, DC-AC is sent into after electric current of the single-phase inversion full-bridge two of DC-AC module to bridge arm being carried out calculus of differences
The feedback input end of the current inner loop module of three close-loop control module, then with the current inner loop module of DC-AC three close-loop control module
Reference value carry out ratio calculating, then will ratio calculate carry out saturation limiting after obtain the single-phase inversion full-bridge of DC-AC module
The PWM drive signal of power tube；
Step E, judge whether to receive to cease and desist order, if receive cease and desist order if finishing control process, otherwise execute
Step A.
Above-mentioned control program can be divided into two parts DC-DC and DC-AC, and the part DC-DC passes through bicyclic PI and controlled,
So that DC side busbar voltage is reached exchange output threshold value, reach the part DC-AC after threshold value pass through virtual value add instantaneous value tricyclic into
Row control, the PWM drive signal of output single-phase inversion full bridge power pipe.The part DC-DC passes through bicyclic PI and is controlled, and remains
The advantages of the easy to accomplish of PI, high robust and quick response, while the part DC-AC passes through tricyclic proportional integration and ratio control
Method, achieve the purpose that eliminate sine wave stable state static difference, be able to maintain again while effective lifting system dynamic response capability
Higher stable state accuracy, to effectively improve the reliability of inverter system.
The above method is advanced optimized, specifically may is that the electricity that DC-DC double -loop control module can be set in step 5
The reference value of pressure outer loop control module is gradually increased to preset DC bus-bar voltage steady-state value by 0, by being gradually increased DC-DC
The reference value of the outer voltage control module of double -loop control module, with the heavy current impact for reaching soft start, reducing starting moment
Purpose, can protect component, improve system reliability.The outermost layer of DC-AC three close-loop control module can be set in step B
The reference value that the reference value of alternating voltage effective value ring module is gradually increased to preset alternating voltage virtual value by 0, by by
The reference value of the outermost layer alternating voltage effective value ring module of cumulative big DC-AC three close-loop control module, to reach soft start, reduce
The purpose for starting the heavy current impact of moment can protect component, improve system reliability.In addition, the sine wave in step B
Then analysis module can be obtained by the instantaneous voltage during acquiring adjacent voltage over zero twice by root mean square calculation
The virtual value of load voltage, the above method are faster compared with the algorithm of acquisition complete period voltage value, are capable of further lifting system
Dynamic response capability.Signal acquisition module can also acquire load current in real time, and then the present invention is inverse to the single-phase off-network of photovoltaic
Become in the entire control process of device, respectively to current feedback values, the DC- of the voltage feedback value of photovoltaic panel output, photovoltaic panel output
The inductive current of DC module, DC bus-bar voltage, load current, the single-phase inversion full-bridge two of load voltage and DC-AC module are right
The electric current of bridge arm carries out real-time monitoring, and compares respectively with preset corresponding alarm threshold value and/or closing driving output threshold value,
It judges whether to alarm and/or close driving output accordingly, above by the voltage and electricity of real-time monitoring system each section
Stream is realized and carries out under-voltage, overcurrent and overvoltage protection to system multiple portions.
Embodiment
As shown in Figure 1, concrete example illustrates that technical solution of the present invention, this example are inverse for the single-phase off-network of 3KW photovoltaic below
Become device, DC bus-bar voltage steady-state value is preset as 380V, and the reference value of alternating voltage virtual value is preset as 220V, and threshold value one is default
For 228V, exchange output threshold preset is 350V.
The single-phase off-network inverter control method of the photovoltaic of this example is applied to the single-phase off-network inverter of photovoltaic, the photovoltaic list
Phase off-network inverter includes signal acquisition module, DC-DC module, DC-AC module, DC-DC double -loop control module and DC-AC tricyclic
Control module, the DC-DC module are connect with DC-AC module by DC bus, and the signal acquisition module acquires light in real time
Lie prostrate plate output voltage feedback value Vpv_fbk, photovoltaic panel output current feedback values Ipv_fbk, DC-DC module inductive current
The list of Iboost_fbk, DC bus-bar voltage Vbus_fbk, load voltage uc_fbk, load current io_fbk and DC-AC module
Electric current ileg1_fbk and ileg2_fbk of the phase inversion full-bridge two to bridge arm；
Wherein DC-DC double -loop control module processing method the following steps are included:
Step 1: the current feedback values Ipv_fbk of voltage feedback value Vpv_fbk and photovoltaic panel output to photovoltaic panel output
After carrying out mean filter processing, it is sent into MPPT maximum power point tracking algoritic module MPPT, is calculated by disturbance observation or conductance increment
Obtain photovoltaic panel voltage reference value Vpv_ref；
Step 2: photovoltaic panel voltage reference value Vpv_ref and photovoltaic panel the voltage feedback value Vpv_fbk exported are sent into
IIR voltage filter compensating module IIR_V obtains the inductive current reference value Iboost_ref of DC-DC module by second order compensation；
Step 3: by the inductive current reference value Iboost_ref of DC-DC module and the inductive current of DC-DC module
Iboost_fbk is sent into IIR current filtering compensating module IIR_I, obtains after carrying out second order compensation and saturation limiting [0,0.85]
The PWM drive signal PWM1 of DC-DC booster circuit power tube；
Step 4: judging that DC bus-bar voltage Vbus_fbk whether more than 228V, thens follow the steps one if being less than, if super
It crosses, closes MPPT maximum power point tracking algoritic module MPPT and enable, then execute step 5；
Step 5: DC bus-bar voltage Vbus_fbk to be sent into the outer voltage control module of DC-DC double -loop control module
The feedback input end of PID_Vb, and the reference value of the outer voltage control module PID_Vb of DC-DC double -loop control module is set
Vbus_ref is gradually increased to 380V by 0, and the outer voltage control module PID_Vb of DC-DC double -loop control module is according to input
DC bus-bar voltage Vbus_fbk and reference value Vbus_ref carries out PID compensation calculation and obtains the inductive current ginseng of DC-DC module
Examine value Iboost_ref；
Step 6: by the inductive current reference value Iboost_ref of DC-DC module and the inductive current of DC-DC module
Iboost_fbk is sent into the current inner loop control module PID_Ib of DC-DC double -loop control module, carries out PID compensation and saturation limiting
[0,0.85] the PWM drive signal PWM1 of DC-DC booster circuit power tube is obtained after；
Cease and desist order Step 7: judging whether to receive, if receive cease and desist order if finishing control process, otherwise execute
Step 5, to realize the double -loop control of the inductive current Iboost_fbk of DC bus-bar voltage Vbus_fbk and DC-DC module；
The processing method of the DC-AC three close-loop control module the following steps are included:
Step A, judge whether DC bus-bar voltage Vbus_fbk reaches 350V, it is not enabled to DC-AC mould if not up to
The PWM drive signal of the single-phase inversion full bridge power pipe of block exports, and the single-phase inversion full-bridge to DC-AC module is enabled if reaching
The PWM drive signal of power tube exports；
Step B, the ginseng of the outermost layer alternating voltage effective value ring module PID_ucrms of DC-AC three close-loop control module is set
It examines value ucrms_ref and is gradually increased to 220V by 0, load voltage uc_fbk is sent into Sinusoid Analysis module Sine_
Then Analyze is loaded by the instantaneous voltage during acquiring adjacent voltage over zero twice by root mean square calculation
The virtual value uc_rms of voltage, and the virtual value uc_rms of the load voltage outermost layer for being sent into DC-AC three close-loop control module is handed over
The feedback input end of voltage effective value ring moulds block PID_ucrms is flowed, the outermost layer alternating voltage of DC-AC three close-loop control module is effective
Value ring moulds block PID_ucrms is according to the reference value ucrms_ref and load voltage virtual value uc_rms got, through proportional integration
The reference value uc_ref_dc of load voltage virtual value is calculated；
Step C, the reference value uc_ref_dc of load voltage virtual value and standard sine wave generation module Sine_Gen is produced
Raw standard unit's sine vector does product calculation, obtains load voltage reference value uc_ref, then by load voltage reference value
The voltage middle ring module P_uc that uc_ref and load voltage uc_fbk is sent into DC-AC three close-loop control module is obtained after ratio calculates
Obtain the reference value ileg_ref of the current inner loop module P_ileg of DC-AC three close-loop control module；
Step D, electric current ileg1_fbk and ileg2_fbk of the single-phase inversion full-bridge two of DC-AC module to bridge arm are carried out
After calculus of differences be sent into DC-AC three close-loop control module current inner loop module P_ileg feedback input end, then with DC-AC tri-
The reference value ileg_ref of the current inner loop module P_ileg of ring control module carries out ratio calculating, then by ratio calculated result
The PWM drive signal PWM2 of the single-phase inversion full bridge power pipe of DC-AC module is obtained after progress saturation limiting [- 1,1]；
Step E, judge whether to receive to cease and desist order, if receive cease and desist order if finishing control process, otherwise execute
Step A reaches the working condition that output is stablized in exchange.
In above-mentioned whole process, respectively to the electric current of the voltage feedback value Vpv_fbk of photovoltaic panel output, photovoltaic panel output
Value of feedback Ipv_fbk, the inductive current Iboost_fbk of DC-DC module, DC bus-bar voltage Vbus_fbk, load current io_
Electric current ileg1_fbk and ileg2_fbk of the single-phase inversion full-bridge two of fbk, load voltage uc_fbk and DC-AC module to bridge arm
Carry out real-time monitoring, and respectively with preset corresponding alarm threshold value and/or close driving output threshold value compare, judge whether into
The corresponding alarm of row and/or closing driving output, to carry out under-voltage, overcurrent and overvoltage protection to system.
Claims (5)
1. the single-phase off-network inverter control method of photovoltaic, is applied to the single-phase off-network inverter of photovoltaic, the single-phase off-network of photovoltaic is inverse
Becoming device includes signal acquisition module, DC-DC module and DC-AC module, and the DC-DC module and DC-AC module pass through direct current mother
Line connection, the signal acquisition module acquire in real time photovoltaic panel output voltage feedback value, photovoltaic panel output current feedback values,
The inductive current of DC-DC module, DC bus-bar voltage, load voltage and DC-AC module single-phase inversion full-bridge two to bridge arm
Electric current, it is characterised in that: the single-phase off-network inverter of photovoltaic further includes DC-DC double -loop control module and DC-AC three close-loop control
Module；
The processing method of the DC-DC double -loop control module the following steps are included:
Step 1: the current feedback values of voltage feedback value and photovoltaic panel output to photovoltaic panel output carry out mean filter processing
Afterwards, it is sent into MPPT maximum power point tracking algoritic module, is calculated by disturbance observation or conductance increment and obtains photovoltaic panel voltage reference value；
Step 2: the voltage feedback value that photovoltaic panel voltage reference value and photovoltaic panel export is sent into IIR voltage filter compensating module,
The inductive current reference value of DC-DC module is obtained by second order compensation；
It is mended Step 3: the inductive current of the inductive current reference value of DC-DC module and DC-DC module is sent into IIR current filtering
Module is repaid, obtains the PWM drive signal of DC-DC booster circuit power tube after carrying out second order compensation and saturation limiting；
Step 4: judging whether DC bus-bar voltage is more than preset threshold value one, one is thened follow the steps if being less than, if being more than
It is enabled to close MPPT maximum power point tracking algoritic module, then executes step 5；
Step 5: DC bus-bar voltage is sent into the feedback input end of the outer voltage control module of DC-DC double -loop control module,
And obtain reference of the preset DC bus-bar voltage steady-state value as the outer voltage control module of DC-DC double -loop control module
Value, the outer voltage control module of DC-DC double -loop control module carry out PID according to the DC bus-bar voltage and reference value of input
Compensation calculation obtains the inductive current reference value of DC-DC module；
Step 6: the inductive current of the inductive current reference value of DC-DC module and DC-DC module is sent into DC-DC double -loop control
The current inner loop control module of module obtains the PWM drive of DC-DC booster circuit power tube after carrying out PID compensation and saturation limiting
Dynamic signal；
Cease and desist order Step 7: judging whether to receive, if receive cease and desist order if finishing control process, it is no to then follow the steps
Five；
The processing method of the DC-AC three close-loop control module the following steps are included:
Step A, judge whether DC bus-bar voltage reaches preset exchange output threshold value, it is not enabled to DC-AC if not up to
The PWM drive signal of the single-phase inversion full bridge power pipe of module exports, and enables if reaching complete to the single-phase inversion of DC-AC module
The PWM drive signal of bridge power tube exports；
Step B, outermost layer alternating current of the reference value of preset alternating voltage virtual value as DC-AC three close-loop control module is obtained
It is pressed with the reference value of valid value ring moulds block, load voltage is obtained to the virtual value of load voltage through Sinusoid Analysis resume module, and
The virtual value of load voltage is sent into the feed back input of the outermost layer alternating voltage effective value ring module of DC-AC three close-loop control module
End, the outermost layer alternating voltage effective value ring module of DC-AC three close-loop control module is according to the reference value and load voltage got
The reference value of load voltage virtual value is calculated through proportional integration for virtual value；
Step C, the standard unit's sine vector for generating the reference value of load voltage virtual value and standard sine wave generation module
Product calculation is done, load voltage reference value is obtained, load voltage reference value and load voltage are then sent into DC-AC three close-loop control
The voltage middle ring module of module obtains the reference value of the current inner loop module of DC-AC three close-loop control module after ratio calculates；
Step D, DC-AC tricyclic is sent into after electric current of the single-phase inversion full-bridge two of DC-AC module to bridge arm being carried out calculus of differences
The feedback input end of the current inner loop module of control module, then with the ginseng of the current inner loop module of DC-AC three close-loop control module
Value carry out ratio calculating is examined, obtains the single-phase inversion full-bridge of DC-AC module after ratio calculated result is then carried out saturation limiting
The PWM drive signal of power tube；
Step E, judge whether to receive to cease and desist order, if receive cease and desist order if finishing control process, it is no to then follow the steps
A。
2. the single-phase off-network inverter control method of photovoltaic as described in claim 1, it is characterised in that: be arranged in the step 5
It is steady that the reference value of the outer voltage control module of DC-DC double -loop control module by 0 is gradually increased to preset DC bus-bar voltage
State value.
3. the single-phase off-network inverter control method of photovoltaic as described in claim 1, it is characterised in that: be arranged in the step B
The reference value of the outermost layer alternating voltage effective value ring module of DC-AC three close-loop control module is gradually increased to preset exchange by 0
The reference value of voltage effective value.
4. the single-phase off-network inverter control method of photovoltaic as described in claim 1, it is characterised in that: in the step B just
Then string wave analysis module is obtained by the instantaneous voltage during acquiring adjacent voltage over zero twice by root mean square calculation
The virtual value of load voltage.
5. the single-phase off-network inverter control method of photovoltaic as described in claim 1, it is characterised in that: the signal acquisition module
Load current is also acquired in real time；
In the entire control process of the single-phase off-network inverter of photovoltaic, respectively to photovoltaic panel output voltage feedback value, photovoltaic panel
The current feedback values of output, the inductive current of DC-DC module, DC bus-bar voltage, load current, load voltage and DC-AC mould
The single-phase inversion full-bridge two of block carries out real-time monitoring to the electric current of bridge arm, and respectively with preset corresponding alarm threshold value and/or pass
It closes driving output threshold value to compare, judges whether to alarm and/or close driving output accordingly.
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