CN106816952A - A kind of double mode method for handover control of photovoltaic UPS off-network inverters - Google Patents
A kind of double mode method for handover control of photovoltaic UPS off-network inverters Download PDFInfo
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Classifications
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- 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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
-
- 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
-
- 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
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
-
- 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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
-
- 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 discloses a kind of double mode method for handover control of photovoltaic UPS off-network inverters, the method collection photovoltaic solar panel voltage output Vpv, collection battery tension Vb, collection busbar voltage VbusAnd line voltage Vgrid, then by line voltage VgridAccurate calculating so as to control the mode of operation of UPS off-network inverters.There are two important handoff procedures in double mode method for handover control.First is that, when system is in inversion mode of operation, if now power network is accessed, and during photovoltaic output deficiency, load is switched to and is powered by power network.Second is that, when system is powered by power network, when the unexpected power down of power network, system switches to be powered by battery at once, and switching time is less than the resetting time of load, so as to reach the function of UPS.The characteristics of invention has low off-network harmonic wave rate, strong adaptability and fast two-way switch speed.
Description
Technical field
The present invention relates to the control technology field of off-network inverter, and in particular to a kind of photovoltaic UPS off-networks inverter bimodulus
Formula method for handover control.
Background technology
From the point of view of total quantity consumed, China is an energy big country, but because environmental issue is increasingly serious, and traditional energy
Exhaustion, photovoltaic generation has obtained many concerns by its unique advantage.
In traditional photovoltaic off-grid electricity generation system, charged to battery by photovoltaic solar panel, battery tension
By the inversion powering load that boosts, or it is depressured again by after inversion of boosting by BUCK circuits by solar panels output voltage
It is powered to load.In the system of whole inverter, reversible transducer is a control topological structure for core, its control
Algorithm is also the Main way of current research.The aberration rate of the waveform of output voltage is to weigh the important finger of whole control algolithm
Mark.Control algolithm main at present mainly has PI controls, synovial membrane control, Repetitive controller, Based Intelligent Control etc..It is wherein most widely used
It is PI control algolithms.Digital PI control algolithms are simple, and parameter is easy to adjust, with stronger robustness.Due to the off-network inversion
Device also has UPS functions, it is necessary to ensure that system can be quickly switched into battery powering load when power network is abnormal, so that
Proof load not power down reaches the function of UPS.
Work as load changing, when occurring situations such as external disturbance aggravation and mode of operation switch, the stability of system occurs
It is greatly unstable.Therefore the PI algorithms based on fuzzy control are introduced in systems, fuzzy control need not set up and be accurately controlled
System model, has stronger robustness compared to more traditional current control strategies fuzzy control, has to improving the stability of a system
Help well.Fuzzy adaptivecontroller is incorporated into photovoltaic double closed-loop control system, for being fitted to PI control parameters
Work as amendment, whole system is more adapted to nonlinear condition of work.Additionally, in UPS off-network inversions universal on the market at present
The time is more long in the inversion of device and the handoff procedure of rectification mode
The content of the invention
The invention aims to solve drawbacks described above of the prior art, there is provided a kind of photovoltaic UPS off-network inverters
Double mode method for handover control, the process employs the quick method for calculating power network virtual value, occurs when line voltage is detected
When abnormal, system can rapidly be switched to storage battery power supply, it is to avoid the situation of load power down when civil power is lost occur.
The purpose of the present invention can be reached by adopting the following technical scheme that：
A kind of double mode method for handover control of photovoltaic UPS off-network inverters, comprises the following steps：
System is by sample circuit, collection photovoltaic solar panel voltage output Vpv, collection battery tension Vb, gather bus
Voltage VbusAnd line voltage Vgrid；
As photovoltaic solar panel voltage output VpvWhen normal, busbar voltage VbusBy full-bridge inverting, then obtain afterwards after filtering
It is the sinusoidal voltage V of 220V to virtual valueivt, the voltage powering load, system is operated in inversion mode of operation；
When sampling circuit samples to photovoltaic solar panel voltage output VpvWhen abnormal, and detect line voltage VgridPlace
When within normal range (NR), power network end relay K1 is opened, now by the direct powering load of power network, temporary transient on-off switching tube,
Inversion end relay K2 is closed, system is switched to rectification mode of operation by inversion mode of operation, and inversion end relay K2 is opened, electricity
Net voltage VgridBy PWM full-bridge rectifications, then charged a battery by front stage circuits topology；
System detectio line voltage VgridVirtual value, when sampling circuit samples are abnormal to line voltage, disconnect power network
End relay K1, system is quickly switched to inversion mode of operation by rectification mode of operation.
Further, the control method of the inversion mode of operation is to add the modulation of the unipolarity based on PI of fuzzy control
Method, wherein, the unipolarity modulator approach based on PI is specially：Each week for the inverter voltage obtained by full-bridge inverting
The sine table of phase 400 points of totally 400 sampled points with producing in advance is compared one by one, and constantly correction two is adjusted by PI
The dutycycle of individual high-frequency tube, so as to ensure that the voltage that inversion is obtained is 220V alternating voltages.
Further, the fuzzy control detailed process is as follows：
If two input quantities of fuzzy controller are error e (k) and error rate Δ e (k), its expression formula is：
E (k)=e (k)-e (k-1) (1)
Assuming that system is a BIBO system, input includes error e (k) and error rate Δ e (k),
In system, dual input is current error amount ie and current error rate of change d (ie)/dt, and output quantity is the on-line tuning of Ki and Kp
Amount Δ Ki and Δ Kp, control rule is write out after designing membership function by logic judgment sentence.
Further, the fuzzy controller selectes blur indicia as the fuzzy of variable based on PI parameter designings
Set, the blur indicia is designated as PB (honest), PE (just larger), PS (just smaller), ZO (zero), NS (negative smaller), NE respectively
(negative larger), NB (negative big).
Further, quick to be switched to inversion mode of operation detailed process by rectification mode of operation as follows for the system：
When detecting line voltage virtual value VgridWhen abnormal, close power network end relay K1, load be immediately switched to by
Storage battery power supply, in order that being supported on not power down in switching state, it is necessary to assure the resetting time T of loadresetDuring more than switching
Between Tswitch；
Resetting time according to load is a grid cycle, and be divided into for a cycle of power network discrete by as 20ms
400 points, calculate any 200 points therein virtual value V that can calculate line voltagegrid；
According to the modulated signal U of output inverter voltagegIt is 50HZ sine waves, carrier signal UcIt is 20KHZ triangular waves, by electricity
The a cycle of net voltage is divided into 400 discrete points；
The every 50 μ s of system enter a PWM to interrupt, and introduces the number of times grid_num for entering and interrupting, and initial value is 0, is often entered
Once interrupt, grid_num adds 1, when grid_num is 199, reset grid_num, and 200 power networks of point that will be sampled
Voltage data carries out equation below computing：
Wherein, V1, V2 ..., V200 are 200 sampled values of line voltage point, and 4095 is the AD of digital signal processor
Sampling precision, 3 is the maximum voltage to be sampled of AD sampling pins, PocIt is the ratio value of sample circuit.
Further, when sampling circuit samples to line voltage exceed normal grid voltage virtual value 220V ± 220*15%
When, judge line voltage exception.
The present invention has the following advantages and effect relative to prior art：
(1) off-network harmonic wave rate is low, strong adaptability.Harmonic wave rate is less than 3%.Using the unipolarity adjusting method adjusted with PI
Control, it is ensured that the voltage effective value of output waveform is 220V to 230V, harmonic wave rate is less than 1%.It is former due to being influenceed by loading
Some PI control algolithms introduce the concept of fuzzy control it is possible that the problem of stability mutation, and fuzzy control is mainly
For suitably being corrected to PI control parameters, improved PI control algolithms improve system and are worked under nonlinear load
Stability.
(2) two-way switch speed is fast.When civil power loss is detected or civil power is in abnormal state, load is cut at once
It is changed to by storage battery power supply.In this process, it is most important to be ensured be when civil power is abnormal, load need not power off
Switching, that is, the resetting time for loading is greater than switching time.Described inverter can ensure that switching time exists herein
10ms, i.e. switching time are 1/2 grid cycle.
Brief description of the drawings
Fig. 1 is photovoltaic UPS off-network inverter entire block diagrams in the present invention；
Fig. 2 is the circuit topology of reversible transducer in the present invention；
Fig. 3 is the flow chart that inversion is switched to rectification mode in the present invention；
Fig. 4 is the flow chart that rectification is switched to inverter mode in the present invention；
Fig. 5 is the circuit topology under rectification mode in the present invention.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Embodiment
In the embodiment, the double mode method for handover control collection photovoltaic solar panel voltage of photovoltaic UPS off-network inverters
Output Vpv, collection battery tension Vb, collection busbar voltage VbusAnd line voltage Vgrid, by line voltage VgridEssence
Really calculate so as to control the mode of operation of UPS off-network inverters.
Its control method is mainly used in being switched fast between inversion mode of operation and rectification mode of operation in inverter.
The control method of wherein inversion mode of operation employs the method for the unipolarity modulation based on PI, and is added in traditional algorithm
FUZZY ALGORITHMS FOR CONTROL, strengthens the stability that system works under nonlinear condition.The control method of rectification mode of operation is used
Based on the two close cycles algorithm of PI regulations, outer shroud is Voltage loop, and adjusting stabilization busbar voltage by PI produces current amplitude
Output quantity, the output quantity obtains a current-order after being multiplied with the unit sine vector table of phase with frequency with line voltage, passes through
The electric current that current sensor is sampled carries out PI computings so as to realize current closed-loop with the current-order.Double mode switching control is calculated
There are two important handoff procedures in method.First be when system is in inversion mode of operation, if now power network access, and
When photovoltaic output is not enough, load is switched to and is powered by power network.Second is, when system is powered by power network, to work as power network
During unexpected power down, system switches to be powered by battery at once, and switching time is less than the resetting time of load, so that
The function of UPS is reached.Wherein second switching embodies most crucial UPS functions.
Fig. 1 is whole photovoltaic UPS off-networks inverter system frame diagram.Fig. 2 is the core topological structure in whole system, inverse
Become and rectification is required for being controlled by reversible transducer.Fig. 3 is described in detail when system from inverter mode to rectification mode
Workflow during switching, Fig. 4 describes the workflow when system is switched from rectification mode to inverter mode in detail.This reality
Signified system refers in particular to photovoltaic UPS off-network inverter systems in applying example.
A kind of two-way method for handover control of photovoltaic UPS off-network inverters is disclosed in the present embodiment, is comprised the following steps：
S1, system are by sample circuit, collection photovoltaic solar panel voltage output Vpv, collection battery tension Vb, collection
Busbar voltage VbusAnd line voltage Vgrid。
S2, as photovoltaic solar panel voltage output VpvWhen normal, busbar voltage Vbus(400v or so) by full-bridge inverting,
Obtain the sinusoidal voltage V that virtual value is 220V afterwards after filtering againivt, the voltage powering load, system be operated in inversion work
Pattern.
S3, first switching：Switching of the inverter mode to rectification mode.
When sampling circuit samples to photovoltaic solar panel voltage output VpvWhen abnormal, and detect line voltage VgridPlace
When within normal range (NR), power network end relay K1 is opened, at this moment by the direct powering load of power network.Temporary transient on-off switching tube,
Close inversion end relay K2, it is to avoid because remaining electricity is with line voltage VgridSuperposition is offset and influences load.
S4, system are switched to rectification mode of operation, and inversion end relay K2 is opened, line voltage VgridBy PWM full-bridges
Rectification, then charged a battery by front stage circuits topology.
S5, second switching：Switching of the rectification mode to inverter mode.
System can always detect line voltage VgridVirtual value, when sampling circuit samples are abnormal to line voltage (just
Normal line voltage virtual value takes 220V ± 220*15%), power network end relay K1 is disconnected, system is quickly cut by rectification mode of operation
Inversion mode of operation is changed to, the characteristics of embody UPS.
In practical operation, 220V inverter voltages V is produced in the step S2ivtCarry out in accordance with the following steps：
S21, the control method of inversion mode of operation add fuzzy in original unipolarity modulator approach based on PI
The algorithm of control.
In practical operation, the described unipolarity modulator approach based on PI is achieved in that：
The control method of inversion mode of operation is the unipolarity adjusting method based on fuzzy control.Modulated signal is believed for sinusoidal
Number Ug, carrier signal UcIt is triangular signal, carrier signal amplitude is Ucm。
Circuit topological structure figure is Fig. 2, and Q1, Q2 are high-frequency tubes, and the arm of its composition is referred to as high frequency arm, and its control signal is by adjusting
Signal U processedgWith carrier signal UcCompare and obtain.The working frequency of high-frequency tube is the frequency of carrier wave.
Q3, Q4 are low-frequency tubes, and switching frequency is mutually all 50HZ with mains frequency.
The course of work：As modulated signal Ug>When 0：Ug3=Ucm, Ug=0；Work as Ug<When 0：Ug3=0, Ug4=Ucm；Unipolarity
The output voltage U of SPWM inversion full-bridgesoutputIt is divided into three kinds of situations：
(1) Q1 is worked as, when Q3 is turned on, Uoutput=+E；
(2) when Q1 and Q4 is turned on or Q2 and Q3 is turned on, Uoutput=0；
(3) Q2, Q4 conductings U are worked asoutput=-E.
What the off-network inverter in the system was used is both unipolar control mode described above, and high frequency tube power is
20KHZ, low frequency tube power is 50HZ, so sine table takes 400 points.Voltage by passing through again after sampling processing circuit after inversion
AD mouthfuls is input in digital signal processor, is collected using oscillograph and is input to numeral when inverter voltage virtual value is 220V
Waveform signal in signal processor, 400 sinusoidal cycles tables of point are produced according to the waveform signal for collecting.So whole
The thinking that controls of inversion is：Each cycle for the inverter voltage obtained by full-bridge totally 400 sampled points with producing in advance
The sine table of 400 points is compared one by one, constantly two dutycycles of high-frequency tube of correction is adjusted by PI, so as to ensure inversion
The voltage for obtaining is 220V alternating voltages.
S22, the diversity due to loading in actual applications, for the stabilization that strengthening system works under nonlinear condition
Property, therefore the algorithm of fuzzy control is added in whole algorithm.If two input quantities of fuzzy controller are error e (k) and error
Rate of change Δ e (k), its expression formula is：
E (k)=e (k)-e (k-1) (1)
The system is a BIBO system, and input includes error (e (k)) and error rate (Δ e (k)),
In systems, dual input is current error amount ie and current error rate of change d (ie)/dt, and output quantity is the online tune of Ki and Kp
Whole amount Δ Ki and Δ Kp.Control rule is write out by logic judgment sentence after designing membership function.For being ground in the system
The fuzzy controller of the PI parameter designings studied carefully, selectes fuzzy set of seven blur indicias as variable.PB is designated as respectively (just
Greatly), PE (just larger), PS (just smaller), ZO (zero), NS (negative smaller), NE (negative larger), NB (negative big), programming foundation
Fuzzy control rule table shown in table 3 and table 4.
Table 1.Ki parameter fuzzy control rule tables
Table 2.Kp parameter fuzzy control rule tables
In practical operation, the rectification mode of operation described in S4 is realized by following steps：
The control method of rectification mode employs the double-closed-loop control algorithm based on PI.It is negative in Fig. 5 in ups system
Carry be battery when system detectio to there is normal power network to access when, and photovoltaic now is when being input into relatively low, whole inversion
Device will be into rectification link.The circuit of rectifying part uses the circuit with a part with Converting Unit, and using with inverse
Method as covert, wherein U in upper figures, IsAC network effective voltage value and alternating current virtual value are represented respectively.By triangle
The SPWM that ripple and sine wave are produced after being modulated controls 5 V1-V4 processed, so as to produce SPWM ripples U at ab two endsab, UabIn contain with
Sinusoidal signal wave amplitude is directly proportional and frequency identical fundametal compoment, in addition also contains with the relevant high order of switching frequency
Harmonic wave, but without low-order harmonic.In circuit due to the presence of inductance L, the voltage of higher hamonic wave can't largely shadow
Ring to alternating current Is, ignore this small influence, IsIt is with mains frequency identical sine wave, in power network end alternating voltage
UsOne timing, IsAmplitude and phase be by UabIn fundametal compoment amplitude and its and UsPhase difference determine.Therefore control
UabCorresponding I can be obtaineds.L assume responsibility for the effect of balanced voltage in circuit, its both end voltage UL=Ldis/ dt, can obtain UL
=j ω Lis=US-Uab。
This explanation PWM rectification circuit can realize the flowing of the positive and negative both direction of energy.Work as IsWith UsSame phase, circuit operation
In rectification state, work as IsWith UsAnti-phase, circuit operates in inverter mode.
In the method for control full bridge PWM rectification, the two close cycles algorithm based on PI regulations is employed, outer shroud is Voltage loop,
Stabilization busbar voltage is adjusted by PI and produces a current amplitude output quantity, the output quantity is with line voltage with frequently with the unit of phase
Sinusoidal vector table obtains a current-order after being multiplied, and the electric current sampled by current sensor carries out PI with the current-order
Computing realizes unity power factor current control so as to realize current closed-loop.
In practical operation, the switching for being rectified to inversion described in S5 is realized by following steps：
S51, second switching are the core switchings of UPS, when detecting line voltage virtual value VgridWhen abnormal, electricity is closed
Net end relay K1, load should be immediately switched to by storage battery power supply, in order that being supported on not power down in switching state, it is necessary to protect
Demonstrate,prove the resetting time T of loadresetMore than switching time Tswitch。
S52, generally, the resetting time of load is a grid cycle, as 20ms.In order to ensure switching time
Less than a grid cycle time, a cycle of power network is divided into 400 discrete points, is by any 200 points therein
The virtual value V of line voltage can be calculatedgrid, that is, the time of 10ms can complete to be rectified to the switching of inversion.
S53, the modulated signal U due to exporting inverter voltagegIt is 50HZ sine waves, carrier signal UcIt is 20KHZ triangular waves,
Therefore a cycle of line voltage is divided into 400 discrete points.
S54, system enter a PWM per (1/20KHZ) 50 μ s and interrupt, and the number of times for entering and interrupting is introduced in a program
Grid_num, initial value is 0, often enters and once interrupts, and grid_num adds 1, when grid_num is 199, resets grid_num,
And 200 voltage datas of point that will be sampled carry out equation below computing：
Wherein, V1, V2 ..., V200 are 200 sampled values of line voltage point, and 4095 is the AD of digital signal processor
Sampling precision, 3 is the maximum voltage to be sampled of AD sampling pins, PocIt is the ratio value of sample circuit, different samplings
Circuit ratio value is different, need to a point situation treat.
In sum, for the problem that the universal UPS photovoltaic off-grid inverter switch speeds in market are slower, the present embodiment is public
The double mode method for handover control of a kind of photovoltaic UPS off-network inverters opened, line voltage V is calculated by using quickgridEffectively
The algorithm of value, allows inverter to be quickly switched to inversion mode of operation by rectification mode, and ensure that switching time is half
Individual grid cycle, makes to be supported on not power down in handoff procedure.
Above-described embodiment is the present invention preferably implementation method, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from Spirit Essence of the invention and the change, modification, replacement made under principle, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (6)
1. the double mode method for handover control of a kind of photovoltaic UPS off-network inverters, it is characterised in that comprise the following steps：
System is by sample circuit, collection photovoltaic solar panel voltage output Vpv, collection battery tension Vb, gather busbar voltage
VbusAnd line voltage Vgrid；
As photovoltaic solar panel voltage output VpvWhen normal, busbar voltage VbusBy full-bridge inverting, then had afterwards after filtering
Valid value is the sinusoidal voltage V of 220Vivt, the voltage powering load, system is operated in inversion mode of operation；
When sampling circuit samples to photovoltaic solar panel voltage output VpvWhen abnormal, and detect line voltage VgridIt is in just
When within the scope of often, power network end relay K1 is opened, now by the direct powering load of power network, temporary transient on-off switching tube is closed
Inversion end relay K2, system is switched to rectification mode of operation by inversion mode of operation, and inversion end relay K2 is opened, power network electricity
Pressure VgridBy PWM full-bridge rectifications, then charged a battery by front stage circuits topology；
System detectio line voltage VgridVirtual value, when sampling circuit samples are abnormal to line voltage, disconnect power network end relay
Device K1, system is quickly switched to inversion mode of operation by rectification mode of operation.
2. the double mode method for handover control of a kind of photovoltaic UPS off-network inverters according to claim 1, it is characterised in that
The control method of the inversion mode of operation is the unipolarity modulator approach based on PI for adding fuzzy control, wherein, the base
It is specially in the unipolarity modulator approach of PI：Each cycle for the inverter voltage obtained by full-bridge inverting totally 400 sampled points
The sine table of 400 points with producing in advance is compared one by one, and constantly two duties of high-frequency tube of correction are adjusted by PI
Than so as to ensure that the voltage that inversion is obtained is 220V alternating voltages.
3. the double mode method for handover control of a kind of photovoltaic UPS off-network inverters according to claim 2, it is characterised in that
The fuzzy control detailed process is as follows：
If two input quantities of fuzzy controller are error e (k) and error rate Δ e (k), its expression formula is：
E (k)=e (k)-e (k-1) (1)
Assuming that system is a BIBO system, input includes error e (k) and error rate Δ e (k), in system
In, dual input is current error amount ie and current error rate of change d (ie)/dt, and output quantity is the on-line tuning amount Δ of Ki and Kp
Ki and Δ Kp, control rule is write out after designing membership function by logic judgment sentence.
4. the double mode method for handover control of a kind of photovoltaic UPS off-network inverters according to claim 3, it is characterised in that
The fuzzy controller selectes fuzzy set of the blur indicia as variable, the blur indicia based on PI parameter designings
PB (honest), PE (just larger), PS (just smaller), ZO (zero), NS (negative smaller), NE (negative larger), NB (negative big) are designated as respectively.
5. the double mode method for handover control of a kind of photovoltaic UPS off-network inverters according to claim 1, it is characterised in that
It is as follows that the system is quickly switched to inversion mode of operation detailed process by rectification mode of operation：
When detecting line voltage virtual value VgridWhen abnormal, power network end relay K1 is closed, load is immediately switched to by battery
Power supply, in order that being supported on not power down in switching state, it is necessary to assure the resetting time T of loadresetMore than switching time
Tswitch；
Resetting time according to load is a grid cycle, and a cycle of power network is divided into discrete 400 by as 20ms
Point, calculates any 200 points therein virtual value V that can calculate line voltagegrid；
According to the modulated signal U of output inverter voltagegIt is 50HZ sine waves, carrier signal UcIt is 20KHZ triangular waves, by power network electricity
The a cycle of pressure is divided into 400 discrete points；
The every 50 μ s of system enter a PWM to interrupt, and introduces the number of times grid_num for entering and interrupting, and initial value is 0, often into once
Interrupt, grid_num adds 1, when grid_num is 199, reset grid_num, and 200 line voltages of point that will be sampled
Data carry out equation below computing：
Wherein, V1, V2 ..., V200 are 200 sampled values of line voltage point, and 4095 is the AD samplings of digital signal processor
Precision, 3 is the maximum voltage to be sampled of AD sampling pins, PocIt is the ratio value of sample circuit.
6. the double mode method for handover control of a kind of photovoltaic UPS off-network inverters according to claim 1, it is characterised in that
When sampling circuit samples to line voltage exceed normal grid voltage virtual value 220V ± 220*15%, power network electricity is judged
Reduce off-flavor is normal.
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| CN110365243A (en) * | 2019-08-20 | 2019-10-22 | 惠州汇能精电科技有限公司 | Contravarianter voltage method of adjustment, device, inverter and computer-readable medium |
| CN112865583A (en) * | 2021-02-05 | 2021-05-28 | 联合汽车电子有限公司 | Control method and system of single-phase off-grid inverter, electronic device and storage medium |
| CN114253139A (en) * | 2021-12-20 | 2022-03-29 | 华中科技大学 | Nanometer positioning platform control system based on switching structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107907763A (en) * | 2017-11-10 | 2018-04-13 | 江苏固德威电源科技股份有限公司 | The quick off-network detection method of energy storage inverter |
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| CN110365243A (en) * | 2019-08-20 | 2019-10-22 | 惠州汇能精电科技有限公司 | Contravarianter voltage method of adjustment, device, inverter and computer-readable medium |
| CN112865583A (en) * | 2021-02-05 | 2021-05-28 | 联合汽车电子有限公司 | Control method and system of single-phase off-grid inverter, electronic device and storage medium |
| CN114253139A (en) * | 2021-12-20 | 2022-03-29 | 华中科技大学 | Nanometer positioning platform control system based on switching structure |
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