CN108336760B - A kind of no-voltage sampling coordinated control system and method for more gird-connected inverters - Google Patents
A kind of no-voltage sampling coordinated control system and method for more gird-connected inverters Download PDFInfo
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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
- H02M7/493—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 the static converters being arranged for operation in parallel
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- H02J3/385—
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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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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Abstract
The invention discloses a kind of no-voltages for more gird-connected inverters to sample coordinated control system and method, including multiple gird-connected inverters and a network voltage acquisition device, the input terminal of each gird-connected inverter is connect with generator unit, the output end of each gird-connected inverter is connect by public grid entry point with power grid, it is connect with communication line between each gird-connected inverter, the network voltage acquisition device is installed on one of gird-connected inverter, the gird-connected inverter acquires network voltage information by network voltage acquisition device, and it is shared by communication line to other gird-connected inverters, other gird-connected inverters utilize the shared network voltage information received and the voltage locally acquired, electric current and power information realize being incorporated into the power networks for Converter Without Voltage Sensor.
Description
Technical field
The present invention relates to a kind of no-voltages for more gird-connected inverters to sample coordinated control system and method.
Background technique
With the continuous development of renewable energy power generation technology, the installed capacity of renewable energy is continuously increased.It is grid-connected inverse
Becoming device is by the key equipment of photovoltaic battery panel, wind-driven generator access power grid.Using centralized photovoltaic plant, wind power plant as representative
Large-scale renewable energy system in need to equip large number of gird-connected inverter.
Gird-connected inverter needs to obtain accurate grid voltage amplitude, phase angle and frequency information when being incorporated into the power networks, to protect
It demonstrate,proves when inverter inputs active power or network voltage reduction to power grid under power grid normal operational condition and reactive power branch is provided
Support.The method that conventional method mostly uses network voltage sampling plus phaselocked loop obtains network voltage information.Therefore, gird-connected inverter is wanted
Install voltage check device additional.Since controller allows input voltage amplitude low, to guarantee accurate network voltage detection, power grid electricity
Pressure detection device will include that devices, the voltage check devices such as voltage transformer, operational amplifier will increase inverter cost.
The prior art is mostly to install voltage collecting device additional in every grid-connection converter, although every inverter can root
Voltage magnitude, phase angle, frequency information are calculated according to local information of voltage, but voltage collecting device increases the cost reduction of system
The competitive advantage of inverter.Existing patent, paper propose the network voltage acquisition methods of a variety of improved forms, are mainly
The detection accuracy in the case of network voltage distortion is improved, does not get rid of the dependence to voltage collecting device.
The communications services such as RS485 can be installed additional in existing large size grid-connected inverter system, and the operating parameter of inverter is carried out
Implement monitoring.Large-scale grid connection inverter system has the characteristics that inverter distance is close, the parameter that is incorporated into the power networks is similar, based on local
The phase-lock technique of information of voltage does not make full use of the advantage of communications service, causes the over-redundancy of hardware, algorithm.
Number of patent application is patent " the distributed grid-connected inversion system global synchronization pulsewidth modulation of " 201410073512.0 "
System and method " discloses a kind of distributed grid-connected inversion system global synchronization variable duration impulse system, it is determined that global pulsewidth tune
The basic structure of system processed, including main control unit (global synchronization unit) and positioned at several parallel network reverses of diverse geographic location
Device, each gird-connected inverter are connect with distributed generation resource, and each gird-connected inverter passes through public grid entry point and power grid
Connection, the main control unit are communicated with all gird-connected inverters, and the main control unit receives the information of each gird-connected inverter,
After determining global synchronization strategy, the global synchronizing signal comprising global synchronization strategy is sent respectively to each gird-connected inverter,
Each gird-connected inverter adjusts the pulsewidth modulation wave phase of oneself using global synchronizing signal, to reach each gird-connected inverter arteries and veins
It can satisfy the phase difference of harmonic cancellation between wide modulating wave, to offset the harmonic wave electricity of each gird-connected inverter injection power grid
Stream, this method can be effectively reduced the harmonic content of total current.But the patent does not refer to how utilizing existing communication channel
Carry out Converter Without Voltage Sensor coordinated control.
Summary of the invention
In order to solve the deficiencies in the prior art, the present invention provides a kind of no-voltages for more gird-connected inverters to sample association
Regulate and control system and method processed, by only installing network voltage acquisition additional in an inverter in more inverter parallels
Device, and using communication modes by the network voltage information sharing of acquisition to other parallel running inverters, realize that no-voltage passes
The coordinated control of sensor is incorporated into the power networks.
To achieve the goals above, technical scheme is as follows:
A kind of no-voltage sampling coordinated control system for more gird-connected inverters, including multiple gird-connected inverters and one
The input terminal of network voltage acquisition device, each gird-connected inverter is connect with generator unit, each parallel network reverse
The output end of device is connect by public grid entry point with power grid, is connect with communication line between each gird-connected inverter, institute
It states network voltage acquisition device to be installed on one of gird-connected inverter, which passes through network voltage acquisition device
Network voltage information is acquired, and is shared by communication line to other gird-connected inverters, other gird-connected inverters are utilized and received
Shared network voltage information and the voltage that locally acquires, electric current and power information realize being incorporated into the power networks for Converter Without Voltage Sensor.
A kind of control method based on the above-mentioned no-voltage sampling coordinated control system for more gird-connected inverters, comprising:
After step 1) installs the gird-connected inverter acquisition network voltage instantaneous value of network voltage acquisition device additional, phaselocked loop is utilized
PLL algorithm obtains accurate electric network voltage phase information, and electric network voltage phase information is converted into pulse signal Syn2；
Step 2) installs the gird-connected inverter of network voltage acquisition device additional for pulse signal Syn2 arteries and veins synchronous with traditional PWM
Signal Syn1 combination is rushed, the mixed synchronization signal MixSyn of electric network voltage phase information and PWM synchronizing information is generated while including,
And mixed synchronization signal MixSyn is transferred to other gird-connected inverters；
Other gird-connected inverters of step 3) predict practical electricity according to the grid-connected inverters electric current value and inverter parameters of acquisition
Net voltage-phase recycles the input/output argument of received mixed synchronization signal MixSyn and inverter to the power grid electricity of prediction
Pressure phase is corrected, to realize being incorporated into the power networks for Converter Without Voltage Sensor.
Further, in the step 1), the grid phase generation module of inverter receives the phase that phase-locked loop pll generates
Signal is that zero moment generates synchronization signal Syn2 in phase, and Syn2 is 0 by 1 jump when phase is 360 °, by 1 number
Become 1 from 0 after the machine cycle of signal processor.
Further, in the step 2), the synchronization signal Syn1 of Syn2 and the generation of tradition PWM synchronization signal generation module
It is handled by signal binding modules and generates mixed synchronization signal MixSyn, wherein the rising edge of Syn1 signal is mixed synchronization letter
The rising edge of number MixSyn signal, the failing edge of Syn2 signal are the failing edge of mixed synchronization signal MixSyn.
Further, in the step 3), other gird-connected inverters predict actual electric network by network voltage prediction algorithm
Voltage-phase, and be corrected by electric network voltage phase of the network voltage correction algorithm to prediction.
Further, the network voltage prediction algorithm is according to the two-phase sample rate current under gird-connected inverter dq coordinate system
Information and known inverter output filtering parameter predict actual electric network voltage phase.
Further, the network voltage correction algorithm is to pass through received mixed synchronization signal MixSyn, parallel network reverse
Device actual output current and input power correct electric network voltage phase, and export the network voltage through overcorrection and predict phase
Position.
Further, in network voltage prediction algorithm, current forecasting value dq component is exported using grid-connected invertersActual output current dq component iM,d、iM,q, the network voltage angular frequency that is corrected 'MIt exports and filters with inverter
Wave inductance value LMCalculate the voltage prediction value dq component at outputting inductance both ends
Wherein, Kp、KiFor the proportional and integral controller parameter in network voltage prediction algorithm；
In network voltage prediction algorithm, the voltage prediction value dq component at inverter outputting inductance both ends is utilized
Output inductor value LM, inductance equivalent resistance is RMBe corrected network voltage angular frequency 'MCalculate inverter simultaneously
Net output current forecasting value dq component
In network voltage prediction algorithm, duty cycle signals v under dq coordinate system is utilizedM,od, vM,oq, DC voltage vM,dc, defeated
The voltage prediction value dq component at inductance both ends outCalculate network voltage predicted value dq component
Further, in predicted voltage correction algorithm, inverter input power P is utilizedM,In, actual output current dq points
Measure iM,d、iM,qCalculate input power and output electric current dq component iM,d、iM,qThe ratio λ of modulus valueM,k:
Wherein, j indicates imaginary unit.In predicted voltage correction algorithm, the mixed synchronization signal MixSyn received is passed through
It crosses grid phase synchronization module and generates reset signal Reset, specifically: grid phase synchronization module detects mixed synchronization signal
Reset signal Reset is generated when failing edge in MixSyn；
In predicted voltage correction algorithm, maximum value tracing algorithm MVT utilizes net voltage prediction value dq componentLocking phase resultRatio λM,k, the network voltage angular frequency that is corrected in previous step 'M,k-1It calculates
The network voltage angular frequency being currently corrected 'M,k。
Electric network voltage phase θ ' in predicted voltage correction algorithm, after correctingMTo utilize the power grid electricity after correcting
Pressure angular frequency 'M,kIt is calculated:
θ′M=ω 'M,k·t (1-5)
When receiving reset signal Reset, the time, t became 0.
Further, the specific steps of the maximum value tracing algorithm MVT are as follows:
If λM,k> λM,k-1And ω 'M,k< ω 'M,k-1, then execute algorithm:
ω′M,k=ω 'M,k-1-Δω′
If λM,k> λM,k-1And ω 'M,k> ω 'M,k-1, then execute algorithm:
ω′M,k=ω 'M,k-1+Δω′
If λM,k< λM,k-1And ω 'M,k> ω 'M,k-1, then execute algorithm:
ω′M,k=ω 'M,k-1-Δω′
If λM,k< λM,k-1And ω 'M,k< ω 'M,k-1, then execute algorithm:
ω′M,k=ω 'M,k-1+Δω′
Wherein, the variable with k indicates this calculated result, and the variable with k-1 indicates last computation as a result, Δ ω '
For the numerical value that angular frequency changes every time, switching frequency f can be utilized by having valueM, sWith power grid nominal operating frequency f0It acquires:
In above-mentioned various subscript, M indicates current gird-connected inverter number.
Compared with prior art, the beneficial effects of the present invention are:
(1) the Converter Without Voltage Sensor coordinated control system and method for this patent institute drawings Yu Duotai grid-connected inverter system,
A set of voltage sampling apparatus only need to be installed in inverter 1, adopted compared to existing voltage of installing in every gird-connected inverter
For sampling device, the mentioned system of this patent can reduce the overall cost of more grid-connected inverter systems.
(2) the Converter Without Voltage Sensor coordinated control system and method for this patent institute drawings Yu Duotai grid-connected inverter system,
For the method for individually sampling electric network voltage phase compared to existing every inverter, the consistency of locking phase can be increased, improved
The response characteristic of more inverter entirety.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is the multi-inverter parallel system schematic of the invention containing communication channel；
Fig. 2 is the power circuit and each section control algolithm schematic diagram of inverter 1 of the present invention；
Fig. 3 is power circuit and each section control algolithm schematic diagram of the inverter 2 of the present invention to N；
Mixed synchronization signal generates in Fig. 4 inverter 1 of the present invention and inverter 2 is to N reset signal production method schematic diagram
The maximum value tracing algorithm flow chart of Fig. 5 present invention amendment network voltage angular frequency.
Specific embodiment
The present invention is described further with specific embodiment with reference to the accompanying drawing.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
In the present invention, term for example "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", " side ",
The orientation or positional relationship of the instructions such as "bottom" is to be based on the orientation or positional relationship shown in the drawings, only to facilitate describing this hair
Bright each component or component structure relationship and the relative of determination, not refer in particular to either component or element in the present invention, cannot understand
For limitation of the present invention.
In the present invention, term such as " affixed ", " connected ", " connection " be shall be understood in a broad sense, and indicate may be a fixed connection,
It is also possible to be integrally connected or is detachably connected；It can be directly connected, it can also be indirectly connected through an intermediary.For
The related scientific research of this field or technical staff can determine the concrete meaning of above-mentioned term in the present invention as the case may be,
It is not considered as limiting the invention.
As background technique is introduced, exists in the prior art in every grid-connection converter and installs voltage collecting device additional,
The cost for increasing system reduces the competitive advantage of inverter, and do not make full use of communications service, causes hardware, algorithm
The problem of over-redundancy, in order to solve technical problem as above, this application provides a kind of for more gird-connected inverters without electricity
Pressure sampling coordinated control system and method, by only installing power grid additional in an inverter in more inverter parallels
Voltage collecting device, and realized the network voltage information sharing of acquisition to other parallel running inverters using communication modes
The coordinated control of Converter Without Voltage Sensor is incorporated into the power networks.
As shown in Figure 1, a kind of no-voltage for more gird-connected inverters samples coordinated control system, including multiple grid-connected inverse
Become device and a network voltage acquisition device, the input terminal of each gird-connected inverter connect with renewable generator unit,
The output end of each gird-connected inverter is connect by public grid entry point PCC with power grid, between each gird-connected inverter
It is connect with communication line CH, the network voltage acquisition device is installed on one of gird-connected inverter, the parallel network reverse
Device acquires network voltage information by network voltage acquisition device, and is shared by communication line CH to other gird-connected inverters,
Other gird-connected inverters are realized using the shared network voltage information received and the voltage locally acquired, electric current and power information
Converter Without Voltage Sensor is incorporated into the power networks.
For convenience of explanation, total gird-connected inverter quantity is defined as N, and inverter number definition is M, therefore M=1 ..., N,
The gird-connected inverter number for wherein installing network voltage acquisition device additional is 1, and the number of other gird-connected inverters is 2-N, and is defined
The output inductor value that gird-connected inverter M is connected is LM, inductance equivalent resistance is RM, the three-phase output of gird-connected inverter M
Current definition is iM,a、iM,bAnd iM,c, it is collectively referred to as iM,abc, the switching frequency of gird-connected inverter is defined as fM, s, the selection of size
For common knowledge in the industry.
As shown in Fig. 2, the inverter 1 includes power circuit and controller.
Power circuit portion mainly includes DC-DC converter (DC-DC), direct-current-alternating-current converter (DC-AC), simultaneously
Net current sample and network voltage sampling, design parameter design method are common knowledge in the industry.
Controller mainly includes that inverter traditional control algorithm and mixed pulses generate algorithm.
Inverter traditional control algorithm is common knowledge in the industry, wherein maximum power tracing module is used to guarantee photovoltaic electric
The output of pond plate remains at maximum power, v1,dcrefFor the reference value of inverter direct-current voltage, DC control module is used to
By DC voltage v1,dcControl v1,dcref, phase-locked loop pll is according to the network voltage v of sampling1,abcCalculate the reality of network voltage
Phase theta, abc/dq algorithm utilize θ by three-phase grid electric current i1,abcBe converted to biphase current i under dq coordinate system1,dAnd i1,qIt (is collectively referred to as
For i1,dq), i1,dqWith reference current i1,drefAnd i1,qref(it is collectively referred to as i1,dqref) be compared, dq coordinate is generated by adjuster
It is lower duty cycle signals v1,odAnd v1,oq(it is collectively referred to as v1,odq), v1,odqArteries and veins is generated by dq/abc inverse transformation and PWM generation module
It rushes signal and is sent to power circuit portion.
It includes tradition PWM synchronization signal generation module, grid phase signal generator module and letter that mixed pulses, which generate algorithm,
Number binding modules, algorithm output are mixed synchronization signal MixSyn, and detailed process will elaborate in control method below.
As shown in figure 3, the inverter M (M=2,3 ... ..., N) includes power circuit and controller.
Power circuit portion mainly includes DC-DC converter (DC-DC), direct current friendship-current converter (DC-AC) and simultaneously
Net current sample.
Controller mainly includes inverter traditional control algorithm, network voltage prediction algorithm and network voltage correction algorithm.
Inverter traditional control algorithm is common knowledge in the industry, wherein maximum power tracing module is used to guarantee the defeated of photovoltaic battery panel
Maximum power is remained at out, and maximum power tracing module calculates the input power P of inverterM,in, vM,dcrefFor inverter
The reference value of DC voltage, DC control module are used to DC voltage vM,dcControl vM,dcref, θ 'MFor network voltage correction
Output in algorithm is as a result, abc/dq algorithm utilizes θ 'MBy three-phase grid electric current iM,abcBe converted to biphase current under dq coordinate system
iM,dAnd iM,q(it is collectively referred to as iM,dq), iM,dqWith reference current iM,drefAnd iM,qref(it is collectively referred to as iM,dqref) be compared, through overregulating
Device generates duty cycle signals v under dq coordinate systemM,odAnd vM,oq(it is collectively referred to as vM,odq), vM,odqIt is raw by dq/abc inverse transformation and PWM
Pulse signal is generated at module and is sent to power circuit portion.
Network voltage prediction algorithm is according to two-phase sample rate current information under gird-connected inverter dq coordinate system and known
Inverter exports filtering parameter and predicts that actual electric network voltage phase, network voltage correction algorithm are believed by received mixed synchronization
Number MixSyn, sampling iM,dqWith inverter input power PM,inElectric network voltage phase is corrected, is exported as through overcorrection
Network voltage predicted phase θ 'M, detailed process will elaborate in control method below.
A kind of control method based on the above-mentioned no-voltage sampling coordinated control system for more gird-connected inverters, comprising:
After step 1) gird-connected inverter 1 acquires network voltage instantaneous value, accurate power grid is obtained using phase-locked loop pll algorithm
Voltage phase information, and electric network voltage phase information is converted into pulse signal Syn2；
Step 2) gird-connected inverter 1 in conjunction with traditional PWM synchronization pulse Syn1, generates pulse signal Syn2 same
When the mixed synchronization signal MixSyn comprising electric network voltage phase information and PWM synchronizing information, and by mixed synchronization signal
MixSyn is transferred to other gird-connected inverters 2-N；
Step 3) other gird-connected inverters 2-N predicts practical according to the grid-connected inverters electric current value and inverter parameters of acquisition
Electric network voltage phase recycles the input/output argument of received mixed synchronization signal MixSyn and inverter to the power grid of prediction
Voltage-phase is corrected, to realize being incorporated into the power networks for Converter Without Voltage Sensor.
In the step 1), the grid phase generation module 1PU of inverter 1 receives the phase signal that phase-locked loop pll generates,
It is that zero moment generates synchronization signal Syn2 in phase, Syn2 is 0 by 1 jump when phase is 360 °, at 1 digital signal
Become 1 from 0 after the machine cycle of reason device.
In the step 2), the synchronization signal Syn1 that Syn2 and tradition PWM synchronization signal generation module 1GSU are generated passes through
Signal binding modules 1MU processing generates mixed synchronization signal MixSyn, wherein the rising edge of Syn1 signal is mixed synchronization signal
The rising edge of MixSyn signal, the failing edge of Syn2 signal are the failing edge of mixed synchronization signal MixSyn, implement process
As shown in Figure 4.
In specific implementation, the producing method of the Syny1 be patent " 201410073512.0, distributed grid-connected contravariant system
Method described in global synchronization variable duration impulse system of uniting and method ".
In the step 3), other gird-connected inverters 2-N predicts actual electric network voltage phase by network voltage prediction algorithm
Position, and be corrected by electric network voltage phase of the network voltage correction algorithm to prediction.
The detailed process of network voltage prediction algorithm is as shown in Figure 3.
In network voltage prediction algorithm, current forecasting value dq component is exported using grid-connected invertersIt is practical
Export electric current dq component iM,d、iM,q, the network voltage angular frequency that is corrected 'MWith inverter output inductor value LMIt calculates defeated
The voltage prediction value dq component at inductance both ends out
Wherein, Kp、KiFor the proportional and integral controller parameter in network voltage prediction algorithm, specific choosing method is in the industry
Common knowledge；
In network voltage prediction algorithm, the voltage prediction value dq component at inverter outputting inductance both ends is utilized Output inductor value LM, inductance equivalent resistance is RMBe corrected network voltage angular frequency 'MCalculate inversion
The grid-connected output current forecasting value dq component of device
In network voltage prediction algorithm, duty cycle signals dq component v under dq coordinate system is utilizedM,od, vM,oq, DC voltage
vM,dc, the voltage prediction value dq component at outputting inductance both endsCalculate network voltage predicted value dq component
The detailed process of predicted voltage correction algorithm is as shown in Figure 3.
In predicted voltage correction algorithm, inverter input power P is utilizedM,In, actual output current dq component iM,d、iM,q
Calculate input power and output electric current dq component iM,d、iM,qThe ratio λ of modulus valueM,k:
In predicted voltage correction algorithm, the mixed synchronization signal MixSyn received is by grid phase synchronization module
1RU generates reset signal Reset, specifically: under grid phase synchronization module 1RU is detected in mixed synchronization signal MixSyn
Drop along when generate reset signal Reset；
In predicted voltage correction algorithm, maximum value tracing algorithm MVT utilizes net voltage prediction value dq componentLocking phase resultRatio λM,k, the network voltage angular frequency that is corrected in previous step 'M,k-1It calculates
The network voltage angular frequency being currently corrected 'M,k。
Electric network voltage phase θ ' in predicted voltage correction algorithm, after correctingMTo utilize the power grid electricity after correcting
Pressure angular frequency 'M,kIt is calculated:
θ′M=ω 'M,k·t (1-5)
When receiving reset signal Reset, the time, t became 0.
As shown in figure 5, the specific steps of the maximum value tracing algorithm MVT are as follows:
If λM,k> λM,k-1And ω 'M,k< ω 'M,k-1, then execute algorithm:
ω′M,k=ω 'M,k-1-Δω′
If λM,k> λM,k-1And ω 'M,k> ω 'M,k-1, then execute algorithm:
ω′M,k=ω 'M,k-1+Δω′
If λM,k< λM,k-1And ω 'M,k> ω 'M,k-1, then execute algorithm:
ω′M,k=ω 'M,k-1-Δω′
If λM,k< λM,k-1And ω 'M,k< ω 'M,k-1, then execute algorithm:
ω′M,k=ω 'M,k-1+Δω′
Wherein, the variable with k indicates this calculated result, and the variable with k-1 indicates last computation as a result, Δ ω '
For the numerical value that angular frequency changes every time, switching frequency f can be utilized by having valueM, sWith power grid nominal operating frequency f0It acquires:
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (6)
1. a kind of control method of the no-voltage sampling coordinated control system for more gird-connected inverters, this method are based on a kind of use
Coordinated control system, including multiple gird-connected inverters and a network voltage acquisition dress are sampled in the no-voltage of more gird-connected inverters
It sets, the input terminal of each gird-connected inverter is connect with generator unit, and the output end of each gird-connected inverter is logical
It crosses public grid entry point to connect with power grid, be connect with communication line between each gird-connected inverter, the network voltage acquisition
Device is installed on one of gird-connected inverter, which acquires network voltage letter by network voltage acquisition device
Breath, and shared by communication line to other gird-connected inverters, other gird-connected inverters utilize the shared network voltage received
Information and the voltage locally acquired, electric current and power information realize being incorporated into the power networks for Converter Without Voltage Sensor；It is characterized in that, packet
It includes:
After step 1) installs the gird-connected inverter acquisition network voltage instantaneous value of network voltage acquisition device additional, phase-locked loop pll is utilized
Algorithm obtains accurate electric network voltage phase information, and electric network voltage phase information is converted into pulse signal Syn2；
The gird-connected inverter that step 2) installs network voltage acquisition device additional believes pulse signal Syn2 and traditional PWM lock-out pulse
Number Syn1 is combined, generate include simultaneously electric network voltage phase information and PWM synchronizing information mixed synchronization signal MixSyn, and general
Mixed synchronization signal MixSyn is transferred to other gird-connected inverters；
Other gird-connected inverters of step 3) predict actual electric network electricity according to the grid-connected inverters electric current value and inverter parameters of acquisition
Phase is pressed, recycles the input/output argument of received mixed synchronization signal MixSyn and inverter to the network voltage phase of prediction
Position is corrected, to realize being incorporated into the power networks for Converter Without Voltage Sensor；
In the step 3), other gird-connected inverters predict actual electric network voltage-phase by network voltage prediction algorithm, and lead to
Network voltage correction algorithm is crossed to be corrected the electric network voltage phase of prediction；
The network voltage prediction algorithm is according to two-phase sample rate current information under gird-connected inverter dq coordinate system and known
Inverter output filtering parameter predict actual electric network voltage phase；
In network voltage prediction algorithm, current forecasting value dq component is exported using grid-connected invertersReality output
Electric current dq component iM,d、iM,q, the network voltage angular frequency that is corrected 'MWith inverter output inductor value LMCalculate output electricity
Feel the voltage prediction value dq component at both ends
Wherein, Kp、KiFor the proportional and integral controller parameter in network voltage prediction algorithm；
In network voltage prediction algorithm, the voltage prediction value dq component at inverter outputting inductance both ends is utilized Output
Filter inductance value LM, inductance equivalent resistance is RMBe corrected network voltage angular frequency 'MIt is defeated to calculate grid-connected inverters
Current forecasting value dq component out
In network voltage prediction algorithm, duty cycle signals dq component v under dq coordinate system is utilizedM,od, vM,oq, DC voltage vM,dc,
The voltage prediction value dq component at outputting inductance both endsCalculate network voltage predicted value dq component
In above-mentioned various subscript, M indicates current gird-connected inverter number, wherein M=2,3 ... ..., N.
2. a kind of controlling party of no-voltage sampling coordinated control system for more gird-connected inverters as described in claim 1
Method, which is characterized in that in the step 1), the grid phase generation module of inverter receives the phase letter that phase-locked loop pll generates
Number, it is that zero moment generates synchronization signal Syn2 in phase, Syn2 is 0 by 1 jump when phase is 360 °, by 1 number letter
Become 1 from 0 after the machine cycle of number processor.
3. a kind of controlling party of no-voltage sampling coordinated control system for more gird-connected inverters as described in claim 1
Method, which is characterized in that in the step 2), the synchronization signal Syn1 that Syn2 and tradition PWM synchronization signal generation module generate is passed through
It crosses the processing of signal binding modules and generates mixed synchronization signal MixSyn, wherein the rising edge of Syn1 signal is mixed synchronization signal
The rising edge of MixSyn signal, the failing edge of Syn2 signal are the failing edge of mixed synchronization signal MixSyn.
4. a kind of controlling party of no-voltage sampling coordinated control system for more gird-connected inverters as described in claim 1
Method, which is characterized in that the network voltage correction algorithm is real by received mixed synchronization signal MixSyn, gird-connected inverter
Border output electric current and input power correct electric network voltage phase, and export the network voltage predicted phase through overcorrection.
5. a kind of controlling party of no-voltage sampling coordinated control system for more gird-connected inverters as claimed in claim 4
Method, which is characterized in that in predicted voltage correction algorithm, utilize inverter input power PM,In, actual output current iM,d、iM,q
Calculate input power and output electric current iM,d、iM,qThe ratio λ of modulus valueM,k:
In predicted voltage correction algorithm, the mixed synchronization signal MixSyn received is produced by grid phase synchronization module 1RU
Raw reset signal Reset, specifically: grid phase synchronization module 1RU detects the failing edge in mixed synchronization signal MixSyn
When generate reset signal Reset；
In predicted voltage correction algorithm, maximum value tracing algorithm MVT utilizes net voltage prediction value dq component
Locking phase resultRatio λM,kAnd the network voltage angular frequency being corrected in previous step 'M,k-1It calculates currently through repairing
Positive network voltage angular frequency 'M,k；
Electric network voltage phase θ ' in predicted voltage correction algorithm, after correctingMTo utilize the network voltage angular frequency after correcting
Rate ω 'M,kIt is calculated:
θ′M=ω 'M,k·t (1-5)
When receiving reset signal Reset, the time, t became 0；
In above-mentioned various subscript, M indicates current gird-connected inverter number, wherein M=2,3 ... ..., N.
6. a kind of controlling party of no-voltage sampling coordinated control system for more gird-connected inverters as claimed in claim 5
Method, which is characterized in that the specific steps of the maximum value tracing algorithm MVT are as follows:
If λM,k> λM,k-1And ω 'M,k< ω 'M,k-1, then execute algorithm:
ω′M,k=ω 'M,k-1-Δω′
If λM,k> λM,k-1And ω 'M,k> ω 'M,k-1, then execute algorithm:
ω′M,k=ω 'M,k-1+Δω′
If λM,k< λM,k-1And ω 'M,k> ω 'M,k-1, then execute algorithm:
ω′M,k=ω 'M,k-1-Δω′
If λM,k< λM,k-1And ω 'M,k< ω 'M,k-1, then execute algorithm:
ω′M,k=ω 'M,k-1+Δω′
Wherein, the variable with k indicates this calculated result, and the variable with k-1 indicates last computation as a result, Δ ω ' is angle
The numerical value that frequency changes every time, tool value can utilize switching frequency fM, sWith power grid nominal operating frequency f0It acquires:
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| PCT/CN2018/115560 WO2019184389A1 (en) | 2018-03-29 | 2018-11-15 | System and method for voltage-free sampling coordination control for multiple grid-connected inverters |
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| CN108336760B (en) * | 2018-03-29 | 2019-08-23 | 山东大学 | A kind of no-voltage sampling coordinated control system and method for more gird-connected inverters |
| CN109004681B (en) * | 2018-09-05 | 2019-07-12 | 山东大学 | Based on phaselocked loop without communicating global modulated signal synchronisation control means and system |
| CN111487498B (en) * | 2020-05-20 | 2022-03-25 | 广州思泰信息技术有限公司 | Distribution automation remote availability test system and method |
| CN113935670A (en) * | 2020-07-13 | 2022-01-14 | 中国石油化工股份有限公司 | Storage, and method, device and equipment for grid connection after refining enterprise isolated network operation |
| CN112803803B (en) * | 2021-01-29 | 2022-04-22 | 中国兵器工业集团第二一四研究所苏州研发中心 | Flexible multi-state switch control method and system based on fuzzy logic PI controller |
| CN112994083B (en) * | 2021-02-03 | 2023-10-03 | 深圳科士达新能源有限公司 | Grid-connected rapid presynchronization control method and control system |
| CN113437896B (en) * | 2021-06-25 | 2022-08-19 | 北京英博电气股份有限公司 | Control method and system for parallel connection of multiple inverters |
| CN113625054B (en) * | 2021-08-20 | 2024-07-23 | 固德威技术股份有限公司 | Power grid impedance detection device, inverter and power grid impedance detection method |
| CN114050605B (en) * | 2021-11-18 | 2023-08-15 | 山东大学 | Variable frequency pulse width modulation synchronization system and method based on local power grid phase |
| CN114050597B (en) * | 2021-11-19 | 2024-05-14 | 山东大学 | Cooperative active heat control system and method for multiple grid-connected inverters |
| CN114629151B (en) * | 2022-04-01 | 2024-07-05 | 电力规划总院有限公司 | Current decoupling control method, device and equipment for energy storage grid-connected converter |
| CN115049323B (en) * | 2022-08-16 | 2022-11-15 | 东方电子股份有限公司 | Virtual power plant monitoring system based on distributed resource collaboration |
| CN115800380B (en) * | 2022-12-26 | 2023-12-08 | 山东大学 | Grid-connected variable-current pulse width modulation phase and frequency coordination method and system |
| CN116599125B (en) * | 2023-05-04 | 2023-11-24 | 国网江苏省电力有限公司电力科学研究院 | New energy station simulation optimization method, device, equipment and storage medium |
| CN116599159B (en) * | 2023-07-13 | 2023-10-13 | 湖北长江电气有限公司 | Intelligent control method of photovoltaic grid-connected inverter |
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