CN109768569A - A kind of more gird-connected inverter parallel running systems - Google Patents
A kind of more gird-connected inverter parallel running systems Download PDFInfo
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- CN109768569A CN109768569A CN201811608239.1A CN201811608239A CN109768569A CN 109768569 A CN109768569 A CN 109768569A CN 201811608239 A CN201811608239 A CN 201811608239A CN 109768569 A CN109768569 A CN 109768569A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The present invention provides a kind of more gird-connected inverter parallel running systems, comprising: N platform inverter, the N-1 platform inverter parallel are connected with power grid, and the N-1 platform inverter is correspondingly arranged in N-1 power cell, and all power cells are connected in parallel to power grid；Each power cell includes an inverter, and an inverter connects a photovoltaic array by a Boost；It is carried out between every inverter by arcless breaking mode interconnected；The input terminal of the N platform inverter connects n-th photovoltaic array, and after the output end of the N group photovoltaic array concatenates power diode, the three-phase IPM inverter bridge for active power filtering is inputted, and output connects L filter, forms shunt active power filter device；It further include control unit, described control unit is for controlling the above-mentioned N platform inverter for working in active power filtering state.N platform inverter is directly run on into active power filtering state, filters out harmonic wave, clean electric energy is injected to power grid.
Description
Technical field
The invention belongs to the control of microgrid multi-inverter parallel and distributed generation technology fields, and in particular to more of one kind is simultaneously
Net inverter parallel system, the application being mainly used in micro-capacitance sensor.
Background technique
Demand with the whole world to the energy is growing, and effect of the distributed energy power generation in energy resource structure becomes outstanding
To be important, more and more equipment for power transmission and distribution for using power electronic technique, more and more novel loads are continuously emerged.It is grid-connected
Interface arrangement of the inverter as distributed generation system and power grid, needs to solve a series of technological challenge.Single inverter
It realizes the characteristics such as wide range input voltage and high-tension high-power, but is limited by power electronic devices power, is unable to satisfy
Large-scale distributed electricity consumption occasion.Gird-connected inverter output current harmonics are larger, can pollute power grid, and it is (main to reduce power quality
It is the total harmonic distortion factor of electric current).How to realize powerful gird-connected inverter access power grid, and injects and do to power grid
Net electric energy is a urgent problem.
Summary of the invention
In order to realize large-scale distributed using energy source high-power inverter access power grid and inject cleaning electric energy to power grid
Target, the present invention provides a kind of more gird-connected inverter parallel running systems, and wherein system includes N platform inverter, preceding N-1 platform
Parallel running is normally generated electricity by way of merging two or more grid systems, but since multi-machine parallel connection is run, the current harmonics of output is larger, therefore by N platform
Inverter directly runs on active power filtering state, filters out harmonic wave, and clean electric energy is injected to power grid.
It is used using N-1 platform inverter parallel, meets the requirement of wide range input voltage and high-tension high-power, had and hand over
The advantage for flowing redundancy power generation, increases grid-connected reliability.The operation of inverter multi-machine parallel connection, injection power network current waveform is poor, will
N platform gird-connected inverter is used as active filter, reaches clean to power grid injection and high-power power target.
To achieve the goals above, the invention provides the following technical scheme:
A kind of more gird-connected inverter parallel running systems, comprising:
N platform inverter, the N-1 platform inverter parallel are connected with power grid, and the N-1 platform inverter is correspondingly arranged in N-1 function
In rate unit, all power cells are connected in parallel to power grid；
Each power cell includes an inverter, and an inverter connects one by a Boost
Photovoltaic array；It is carried out between every inverter by arcless breaking mode interconnected；
The input terminal of the N platform inverter connects n-th photovoltaic array, the output end concatenation of the N group photovoltaic array
After power diode, the three-phase IPM inverter bridge for active power filtering is inputted, and output connects L filter, forms shunt active power filter
Device；
It further include control unit, described control unit is used to control the above-mentioned N platform inverter for working in active power filtering state, with
The N platform inverter is set to compensate the current harmonics of all N-1 platform inverter parallel inversion outputs.
In a preferred embodiment of the invention, the point and power grid in parallel of the system real-time detection N-1 platform inverter
Between harmonic wave be connected in parallel to by current controller control and by the instruction current after its reversed polarity as active filter
The net side of source filter, to compensate the harmonic wave of power network current.
In a preferred embodiment of the invention, N-1 platform inverter before being realized using the sagging control based on no interconnection
Grid-connected parallel running is realized etc. to hold inverter and divide equally and injects grid power and not equal appearance inverter is divided by sagging coefficient inverse ratio power
Match.
In a preferred embodiment of the invention, the photovoltaic array goes here and there n and the solar battery board group that constitutes by m
At.
In a preferred embodiment of the invention, every inverter include sequentially connected three-phase IPM inverter bridge,
LCL filter module and A.C. contactor.
In a preferred embodiment of the invention, after the output end concatenation power diode of the photovoltaic array, pass through
After Boost realizes maximal power tracing, three-phase IPM inverter bridge is inputed to, three-phase IPM inverter bridge output end and LCL are filtered
The connection of wave module, connect using A.C. contactor with power grid.
In a preferred embodiment of the invention, described control unit includes DSP control system, detection circuit and driving
Circuit, the DSP control system controls all components, and control instruction is input to power cell by driving circuit, described
Detection circuit is used for the range that can acquire actual Voltage to current transducer to the AD of DSP control chip.
In a preferred embodiment of the invention, the DSP control system further includes AD unit, PWM unit and control
Command unit, variable observed by the AD unit real-time detection, makes comparisons with given value, and departure is passed through control instruction list
Member, output duty cycle generate driving signal using PWM unit and send to driving circuit.
It in a preferred embodiment of the invention, further include accessory power supply, the accessory power supply uses Switching Power Supply, is responsible for
It powers to entire control unit.
By above technical scheme, the technical effects of the invention are that:
(1) photovoltaic battery panel of entire photovoltaic plant is grouped, is displayed by photovoltaic and carries out MPPT control, it can be to avoid illumination
Mismatch problems caused by shade, different size and different directions etc..
(2) multi-inverter parallel based on the sagging control of no control interconnection is utilized, it is mutually redundant between more, it can be enhanced and be
The stability of system, while improving the installed capacity of whole system.
(3) it does APF function using an inverter in system to run, the electric current that can filter out plural parallel stage generation is humorous
Wave injects clean electric energy to system.
Detailed description of the invention
Attached drawing 1 is overall structure block diagram of the invention.
Attached drawing 2 is the layout viewing of photovoltaic array of the invention.
Attached drawing 3 is maximal power tracing schematic diagram of the invention.
Attached drawing 4 is the control block diagram of the invention based on sagging control.
Attached drawing 5 is parallel connection type APF control block diagram of the invention.
Attached drawing 6 is sample circuit principle and connection figure of the invention.
Specific implementation
Below in conjunction with the attached drawing of the invention patent, the technical solution being related to is clearly and completely described.
Embodiment 1:
Core of the invention is to provide a kind of more gird-connected inverter parallel Operation Control system and methods with APF function.
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawings and detailed description to the present invention
Patent is described in further detail.
The embodiment of the first aspect of the present invention provides a kind of control system, for microgrid multi-inverter parallel control and
Distributed generation technology field, and in particular to a kind of more gird-connected inverter parallel Operation Control systems with APF function, it is attached
Fig. 1 is a kind of structural block diagram of the more gird-connected inverter parallel Operation Control systems with APF function provided by the invention.
The system filters mould by N group photovoltaic array, N-1 group Boost, N group three-phase IPM inverter bridge, N-1 group LCL
Extensive light is realized in the composition such as block, 1 group of L filter module and N group A.C. contactor, N-1 group photovoltaic combining inverter parallel running
Component is lied prostrate jointly to power grid output power, at the same N group photovoltaic combining inverter play the part of APF role (with current source characteristic,
To power grid injecting compensating electric current, and the harmonic current of harmonic wave generation is offset, makes power network current sine wave), compensate N-1 platform photovoltaic
Harmonic problem brought by gird-connected inverter parallel running finally reaches and injects clean electric energy to power grid.
Photovoltaic array provides energy as non-renewable energy, to whole system；Prime Boost is for boosting and photovoltaic
Array maximal power tracing；Three-phase IPM inverter bridge is responsible for carrying out ac-dc conversion；L and LCL filter are for filtering out in electric current
Higher hamonic wave；AC/DC contactor is for controlling on-off；Suntech Power of each photovoltaic array using 5 strings 10 simultaneously
Attached drawing 2 is shown in STP200-18-UB-1, the arrangement of photovoltaic array, and each photovoltaic array power is 10kW, and each array complementation phase
Even, directly it is connected with corresponding prime Boost.
Such as: 100 groups of photovoltaic displays altogether, first 99 groups are used to normally generate electricity by way of merging two or more grid systems, last group gives APF to provide energy
Source.
Wherein control system module is by DSP28335 control system, detection module and drive module composition, DSP control module
As the core of entire control system, AD sampling is carried out to system, exports the pwm signal of control, software protection, and in difference
Control algolithm switching under working environment.
DSP control system is made of PWM unit, AD unit, protection location and control algolithm unit, and wherein PWM unit produces
The PWM of raw variable duty ratio, AD unit are sampled for digital and analog signaling, and protection location includes alternating current-direct current over-voltage or overcurrent
And overheat protector, control algolithm unit is for executing core control algolithm；Voltage and current detection circuit is responsible for alterating and direct current
Pressure or electric current are transformed into the AD mouthfuls of ranges that can directly sample；Driving circuit be responsible for the signal for exporting the PWM unit of DSP into
Row isolation is amplified to the power that can drive IPM；Accessory power supply is used to power to entire control system.Connection relationship is shown in attached drawing 6
It is shown.
The detection circuit uses DC voltage Hall sensor (VSM025A), DC current Hall sensor (HDC-
10SY), AC voltage transformer (DL-PT202H1), alternating current Hall sensor (HX-10-P) operational amplifier signal tune
Circuit is managed, actual voltage, current value are converted into the voltage range that DSP control chip can sample.
Big signal is converted into small magnitude using the principle of the raw electricity of magnetic by Hall sensor, and D.C mutual-inductor is using similar
The principle of transformer drops to voltage in the range of DSP can sample
The drive circuit module is constituted using isolation DC-DC module and HCPL-3120 light every driving chip, for controlling
The normal on-off of MOSFET and IGBT.
The Switching Power Supply of the accessory power supply use+15V, -15V, are powered the control unit of whole system.
Embodiment 2:
The embodiment of the second aspect of the present invention provides a kind of control method, utilizes the more gird-connected inverters with APF function
Parallel Operation Control method not only may be implemented to increase power grid input power, can also realize and filter out current harmonics.
Fig. 3 shows one embodiment of the control method, is a kind of typical maximum power tracking method-disturbance
Observation method detects the output voltage and electric current of photovoltaic array first, calculates the output power of photovoltaic array, then pass through disturbance light
The output voltage of photovoltaic array observes the variation of photovoltaic array output power, continuously changes disturbance electricity according to the trend of changed power
Direction is pressed, photovoltaic array is made finally to work in maximum power point.
As shown in Fig. 3, judge photovoltaic arrayP(k) withP(k-1) size, ifP(k) it is less thanP(k-1), explanation is worked as
Otherwise preceding operating point illustrates present operating point on the left of maximum power point on the right side of maximum power point；Judge that photovoltaic array is defeated again
Voltage outU(k) withU(k-1) size, ifU(k) it is greater thanU(k-1), illustrate increasing disturbance voltage, it should reduce given ginseng
Examine voltageU ref, otherwise illustrate reducing disturbance voltage, it should be carried out along perturbation direction；It is found with this perturbation scheme maximum
Power points.
Fig. 4 shows second embodiment of the control method, is the separate unit gird-connected inverter control based on sagging control
Block diagram.
More inverter parallel problems are directed to, we use arcless breaking technology, are using sagging control
N-1 platform parallel system in, there is no interconnection line between every inverter, be artificially induced sagging coefficient respectively, detect itself
Active power and reactive power, are adjusted output frequency and voltage magnitude, flow to realize.
Prime Boost realizes MPPT control using disturbance observation method, and latter stage grid inverter uses sagging control
Strategy.
Inductive current is detected firsti labc, inverter output end mouth voltageu oabcAnd grid-connected currenti oabc, utilize detection limitu oabcWithi labcIt realizes voltage and current double closed-loop, gird-connected inverter is made to enter off-grid operation mode.
Network voltage u is detected againgabc, carry out grid voltage amplitude and phase and gird-connected inverter synchronously control.Work as voltage
After amplitude phase synchronizes, off-network mode turns grid-connect mode, and sagging control ring is added.It will test using instantaneous power calculating method
Amountu oabcWithi oabcOutput power is calculated, generates reference voltage instruction in conjunction with sagging equation.List may be implemented by the method for top
Platform grid-connected inverters.
N-1 platform gird-connected inverter parallel running and access power grid before realizing, before equally using first off-grid mode access
One gird-connected inverter is re-introduced into sagging control ring after operating normally, and finally takes down locking phase information, is to realize by this method
N-1 platform gird-connected inverter parallel running before the sagging control of no interconnection is realized.
Realize etc. hold inverter divide equally inject grid power and not etc. appearance inverter by sagging coefficient inverse ratio power distribution
Control, analyzed for active, the output voltage amplitude of two inverters is respectively as follows:
When two inverter rated capacities are identical, i.e.,, take its voltage reference value, sagging coefficient difference equal at this time,
Have、, to make each inverter output power equal at this time, i.e., to make, then must have。
When two inverter rated capacities are not identical, have(For the ratio of the rated capacity of inverter 1,2)
It takes its voltage reference value equal at this time, that is, has, remove vertical coefficient, to make each inverter by respective volume at this time
Constant volume ratio active power of output, i.e.,, then must have。
Fig. 5 shows the third embodiment of the control method, is that N platform photovoltaic combining inverter realizes active power filtering
Control block diagram.Active filter uses the topology of parallel connection type, and N-1 inverter parallel node, filters out multimachine inverter before accessing
The current harmonics that parallel connection generates.
As shown in figure 5, using DC voltage outer ring, the control strategy of current inner loop.It is asked for the harmonic wave in power quality
Topic, utilizes parallel network reverse to the harmonic problem in power quality in the consistent needle of physical structure using gird-connected inverter and APF
The consistency of device and APF in physical structure, it is only necessary to which APF function can be realized by modifying algorithm, using being based on instantaneous reactive function
The compensation current methods of rate theory, the harmonic wave between real-time detection N-1 platform parallel connection point and power grid, and by conduct after its reversed polarity
The instruction current of APF is connected in parallel to the net side of APF by current controller control, to compensate the harmonic wave of power network current.
As shown in fig. 6, being the annexation figure of detection circuit, DC voltage Hall sensor VSM025A is connected in parallel on direct current
Between bus DC+ and DC-, output meets amplifier K1Carry out signal condition；DC current Hall sensor HDC-10SY is connected on directly
It flows on bus DC+, output meets amplifier K2Carry out signal condition；Alternating current Hall sensor HX-10-P is connected on ABC three-phase
On, output meets amplifier K3Carry out signal condition；AC voltage transformer DL-PT202H1 is connected in parallel on two in three-phase alternating current ABC
Phase, output meet amplifier K3Carry out signal condition；Big signal is converted into small magnitude using the principle of the raw electricity of magnetic by Hall sensor,
And D.C mutual-inductor utilizes the principle of similar transformer, and voltage is dropped in the range of DSP can sample.
To sum up, which is grouped the photovoltaic battery panel of entire photovoltaic plant, displays by photovoltaic and carries out MPPT
Control, can be to avoid mismatch problems caused by illumination shade, different size and different directions etc..
It is mutually redundant between more using the multi-inverter parallel based on the sagging control of no control interconnection, system can be enhanced
Stability, while improving the installed capacity of whole system.APF function is done using an inverter in system to run, it can be with
The current harmonics for filtering out plural parallel stage generation, clean electric energy is injected to system.
Claims (9)
1. a kind of more gird-connected inverter parallel running systems characterized by comprising
N platform inverter, the N-1 platform inverter parallel are connected with power grid, and the N-1 platform inverter is correspondingly arranged in N-1 function
In rate unit, all power cells are connected in parallel to power grid；
Each power cell includes an inverter, and an inverter connects one by a Boost
Photovoltaic array；It is carried out between every inverter by arcless breaking mode interconnected；
The input terminal of the N platform inverter connects n-th photovoltaic array, the output end concatenation of the N group photovoltaic array
After power diode, the three-phase IPM inverter bridge for active power filtering is inputted, and output connects L filter, forms shunt active power filter
Device；
It further include control unit, described control unit is used to control the above-mentioned N platform inverter for working in active power filtering state, with
The N platform inverter is set to compensate the current harmonics of all N-1 platform inverter parallel inversion outputs.
2. more gird-connected inverter parallel running systems of one kind according to claim 1, which is characterized in that the system is real
When detection N-1 platform inverter in parallel point and power grid between harmonic wave, and by the finger after its reversed polarity as active filter
Electric current is enabled, is connected in parallel to the net side of active filter, by current controller control to compensate the harmonic wave of power network current.
3. more gird-connected inverter parallel running systems of one kind according to claim 1 or 2, which is characterized in that utilize base
The N-1 platform grid-connected inverters parallel running before the sagging control of no interconnection is realized, realization etc. hold inverter and respectively inject power grid function
Rate and does not hold inverter not etc. and press sagging coefficient inverse ratio power distribution.
4. more gird-connected inverter parallel running systems of one kind according to claim 1, which is characterized in that the photovoltaic battle array
Column go here and there n by m and the solar panel that constitutes forms.
5. more gird-connected inverter parallel running systems of one kind according to claim 3, which is characterized in that described every inverse
Becoming device includes sequentially connected three-phase IPM inverter bridge, LCL filter module and A.C. contactor.
6. more gird-connected inverter parallel running systems of one kind according to claim 1, which is characterized in that the photovoltaic battle array
After the output end concatenation power diode of column, after Boost realizes maximal power tracing, it is inverse to input to three-phase IPM
Become bridge, three-phase IPM inverter bridge output end connect with LCL filter module, connect using A.C. contactor with power grid.
7. more gird-connected inverter parallel running systems of one kind according to claim 1, which is characterized in that the control is single
Member includes DSP control system, detection circuit and driving circuit, and the DSP control system controls all components, and passes through driving
Control instruction is input to power cell by circuit, and the detection circuit is used to actual Voltage to current transducer to DSP controlling core
The range that the AD of piece can be acquired.
8. more gird-connected inverter parallel running systems of one kind according to claim 7, which is characterized in that the DSP control
System processed further includes AD unit, PWM unit and controling instructin unit, variable observed by the AD unit real-time detection, with
Given value is made comparisons, by departure pass through controling instructin unit, output duty cycle, using PWM unit generate driving signal send to
Driving circuit.
9. more gird-connected inverter parallel running systems of one kind according to claim 8, which is characterized in that further include auxiliary
Power supply, the accessory power supply use Switching Power Supply, are responsible for powering to entire control unit.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110120683A (en) * | 2019-06-05 | 2019-08-13 | 贵州电网有限责任公司 | A kind of exchange micro-capacitance sensor simulation system and its control method |
| CN110350582A (en) * | 2019-07-16 | 2019-10-18 | 华北水利水电大学 | Island-grid based on the sagging control of fuzzy optimizes power distribution method |
| CN110502057A (en) * | 2019-07-05 | 2019-11-26 | 北京空间飞行器总体设计部 | A kind of spacecraft solar power adjustment module current equalizing method without current detecting |
| CN111817348A (en) * | 2020-07-31 | 2020-10-23 | 苏州华商新能源有限公司 | Reactive voltage control method for photovoltaic power station |
| CN112803475A (en) * | 2020-12-31 | 2021-05-14 | 深圳市富兰瓦时技术有限公司 | Parallel operation control system and method for household energy storage inverter |
| CN115642783A (en) * | 2022-12-06 | 2023-01-24 | 眉山博雅新材料股份有限公司 | High-frequency power supply and power device for high-frequency power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110120683A (en) * | 2019-06-05 | 2019-08-13 | 贵州电网有限责任公司 | A kind of exchange micro-capacitance sensor simulation system and its control method |
| CN110502057A (en) * | 2019-07-05 | 2019-11-26 | 北京空间飞行器总体设计部 | A kind of spacecraft solar power adjustment module current equalizing method without current detecting |
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| CN110350582A (en) * | 2019-07-16 | 2019-10-18 | 华北水利水电大学 | Island-grid based on the sagging control of fuzzy optimizes power distribution method |
| CN111817348A (en) * | 2020-07-31 | 2020-10-23 | 苏州华商新能源有限公司 | Reactive voltage control method for photovoltaic power station |
| CN112803475A (en) * | 2020-12-31 | 2021-05-14 | 深圳市富兰瓦时技术有限公司 | Parallel operation control system and method for household energy storage inverter |
| CN115642783A (en) * | 2022-12-06 | 2023-01-24 | 眉山博雅新材料股份有限公司 | High-frequency power supply and power device for high-frequency power supply |
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