CN108521140A - A kind of distributed photovoltaic and from energy storage inversion system - Google Patents
A kind of distributed photovoltaic and from energy storage inversion system Download PDFInfo
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
A kind of distributed photovoltaic and from energy storage inversion system, including photovoltaic array, BOOST monotonic transformations circuit, MPPT maximum power point tracking MPPT devices, energy-storage system, DC bus and off-network controller and off-network inverter and micro-capacitance sensor；The output energy of the photovoltaic array is connected to after passing sequentially through BOOST monotonic transformations circuit and MPPT maximum power point tracking MPPT devices in DC bus, the energy-storage system parallel connection accesses DC bus, DC bus is connected by simultaneously off-network inverter with micro-capacitance sensor, micro-capacitance sensor forms grid-connect mode with major network connection, and micro-capacitance sensor forms off-network pattern with major network disconnection；Described and off-network controller is connected with simultaneously off-network inverter, and off-network controller carries out isolated island detection to micro-capacitance sensor, and automatically switches according to testing result to grid-connect mode and off-network pattern.Realize it is grid-connected, off-network, energy storage the coordinating and unifying, reduce system cost.
Description
Technical field
The present invention relates to the grid-connected field of solar cell more particularly to a kind of distributed photovoltaic and from energy storage inversion system.
Background technology
With the continuous increase of photovoltaic plant installed capacity, current general photovoltaic plant capacity all reaches MW grades, if
Also the inverter of low capacity is used the inverter number of units of entire photovoltaic plant will to be caused too many, can not only increase the construction in power station at
This, and the generating efficiency in entire power station can be influenced.In order to improve power, reliability and the efficiency in power station and reduce cost, mesh
Preceding large-scale photovoltaic plant all uses powerful photovoltaic combining inverter.Powerful photovoltaic combining inverter is adopted more in the industry
With the mode of more small-power inverter parallels.However when more photovoltaic DC-to-AC converter parallel connections, the DC side of inverter and
Exchange side shares a busbar respectively, and circulation is formed so as to cause between photovoltaic DC-to-AC converter in parallel.This electric current causes simultaneously
The photovoltaic DC-to-AC converter output current quality of through transport row reduces, and then damages the performance of whole system.
And there are following common defects in existing grid-connected photovoltaic system：
1) output of photovoltaic generating system be illuminated by the light, the influence of the environmental factors such as temperature, output power will present larger
Variation, when especially weather is changeable, more apparent randomness and uncontrollability is presented in generated output；
2) from the perspective of the design of hybrid energy-storing grid-connected photovoltaic system, the system power caused by this fluctuation is not
Balance, is required for that this part imbalance power is supplemented or absorbed by energy-storage units.So, energy-storage units are just bound to often
It is charged and discharged state in frequent, absorbs or send out larger power, and the charging and discharging currents of short time are also bigger.
The capacity of the lead-acid accumulator of frequent operation in this case and service life can all be affected, this is by lead-acid accumulator itself
What characteristic was determined, main cause has at 3 points：Frequent high-power charge and discharge can cause the temperature inside lead-acid accumulator increase and
The active material of positive/negative plate can largely fall off so that irreversible capacity loss occurs for accumulator；High current charge-discharge can make
Polar plate of lead acid storage battery flexural deformation also results in accumulator self-shield shutdown if there is big Voltage Drop；Frequent charge and discharge
Electricity can be such that lead-acid accumulator is operated under charge and discharge partial circulating state, can accelerate aging and the capacity loss of lead-acid accumulator, subtract
The service life cycle of few accumulator.
Invention content
In view of the deficiencies of the prior art, the purpose of the present invention is intended to provide a kind of distributed photovoltaic and off-network energy storage contravariant system
System, realize it is grid-connected, off-network, energy storage the coordinating and unifying, reduce system cost, effectively with the promotion and application of product.
To achieve the above object, the present invention adopts the following technical scheme that：
A kind of distributed photovoltaic and from energy storage inversion system, including photovoltaic array, BOOST monotonic transformations circuit, maximum work
Rate point tracking MPPT devices, energy-storage system, DC bus and off-network controller and off-network inverter and micro-capacitance sensor；The photovoltaic
The output energy of array is connected to direct current mother after passing sequentially through BOOST monotonic transformations circuit and MPPT maximum power point tracking MPPT devices
In line, the energy-storage system parallel connection accesses DC bus, and DC bus is connected by simultaneously off-network inverter with micro-capacitance sensor, micro- electricity
Net forms grid-connect mode with major network connection, and micro-capacitance sensor forms off-network pattern with major network disconnection；Described and off-network controller with and from
Net inverter is connected, and off-network controller to micro-capacitance sensor carry out isolated island detection, and according to testing result to grid-connect mode and from
Net pattern is automatically switched.
Further, the energy-storage system includes accumulator and bidirectional DC-DC converter circuit, and the accumulator passes through two-way
DC-DC conversion circuit accesses in DC bus.
Further, the bidirectional DC-DC converter circuit use buck/boost circuits, including four NPN triode T1,
T2, T3 and T4, super capacitor and two inductance L1 and L2, described NPN triode T1, T2, T3 and T4 are in parallel, the inductance L1 with
After accumulator is connected in the parallel branch of access NPN triode, the super capacitor is incorporated to tri- poles NPN after connecting with inductance L2
The collector and emitter both ends of pipe T4.
Further, described and off-network inverter includes three-phase inverting circuit and three-phase filter inductance composition, the three-phase
There are six switch, each two switch one phase bridge arms of composition, and complementary state is all operated in per the switch of phase bridge arm for inverter circuit.
Further, described and off-network controller is as follows to the charge and discharge control mode of energy-storage system：
S1：Acquisition photovoltaic array is operated in the output power P of maximum power pointpv, and by maximum power point of photovoltaic array
Output power PpvWith power P needed for micro-capacitance sensorrefIt is compared；
S2：To the voltage U of accumulator in energy-storage systembatIt is acquired, and by the voltage U of accumulatorbatWith accumulator
Driving voltage UB, relIt is compared；
S3：The comparison result of combining step S1 and step S2 select four kinds of different operating modes, root according to comparison result
The charge status of accumulator is controlled according to operating mode；Wherein comparison result and its corresponding operating mode situation is as follows：
Operating mode 1：Work as Ppv>Pref, Ubat<UB, relWhen, BOOST monotonic transformation circuits are operated in MPPT patterns；It is two-way
DC-DC conversion circuit is then operated in buck (decompression) pattern, and accumulator charges at this time；
Operating mode 2：Work as Ppv>Pref, Ubat>UB, relWhen, BOOST monotonic transformation circuits are operated in constant power mode；It is two-way
DC-DC conversion circuit does not work；
Operating mode 3：Work as Ppv<Pref, Ubat>UB, relWhen, BOOST monotonic transformation circuits are operated in MPPT patterns；It is two-way
DC-DC conversion circuit is then operated in boost (boosting) pattern, at this time battery discharging；
Operating mode 4：Work as Ppv<Pref, Ubat<UB, relWhen, BOOST monotonic transformation circuits are operated in constant power mode；It is two-way
DC-DC conversion circuit does not work.
Further, described and off-network controller is switched to grid-connect mode in micro-capacitance sensor the control mode of off-network pattern
For：
S1：Under grid-connect mode, major network passes through MPPT maximum power point tracking MPPT to the load supplying being connected in micro-capacitance sensor
Photovoltaic array is adjusted to maximum output by device, and energy-storage system is in charged state；
S2：When detecting external power supply failure using isolated island detection technique, isolated island detection is realized by simultaneously off-network controller
With overall isolation, then use current control mode, by the lead lag relationship of grid-connected front and back micro-capacitance sensor voltage phase angle, gradually
It adjusts its output voltage phase angle to coincide with network voltage, realize grid-connected to off-grid switching；
S3：Under off-network pattern, energy-storage system is to load supplying.
Further, described and off-network controller is to off-network pattern switching in micro-capacitance sensor to the control mode of grid-connect mode
For：
S1：Under off-network pattern, energy-storage system is to load supplying；
S2：When detecting external power supply fault recovery using isolated island detection technique, using V/f control modes to entire isolated
Micro-capacitance sensor voltage magnitude and phase reference are provided, by and off-network inverter output voltage and its phase according to voltage magnitude and
Phase reference is adjusted, and realizes off-network to grid-connected seamless switching；
S3：Under grid-connect mode, major network passes through MPPT maximum power point tracking MPPT to the load supplying being connected in micro-capacitance sensor
Photovoltaic array is adjusted to maximum output by device, and energy-storage system is in charged state.
The beneficial effects of the present invention are：
(1) and the main topological structure optimization of off-network inverter design, realize it is grid-connected, off-network, energy storage the coordinating and unifying, drop
Low system cost.
(2) it in terms of accumulator and super capacitor hybrid energy-storing coordination control strategy, needs to avoid battery-operated as possible
In frequent charging and discharging state, while reducing the electric current of accumulator cell charging and discharging.
(3) multichannel MPPT tracking and power coordination control technology, overcome between the rapidity of tracking and stable state accuracy of detection
Contradiction, improve the stability of output power.
(4) and the research of off-network change device high efficiency modulation technique, reduction underload switch loss are conducive to improve efficiency.
(5) switching control technology detected based on isolated island and off-network controller, realizes grid-connected and off-grid automatic switchover,
Complete response of the inverter to power grid is realized, the stability and the safety that improve micro-capacitance sensor are conducive to.
Description of the drawings
Fig. 1 is for distributed photovoltaic of the present invention and from the structure chart of energy storage inversion system；
Fig. 2 is for distributed photovoltaic of the present invention and from the circuit diagram of energy storage inversion system.
Reference numeral：1, photovoltaic array；2, BOOST monotonic transformations circuit；3, MPPT maximum power point tracking MPPT devices；4, it stores up
It can system；5, DC bus；6 and off-network controller；7 and off-network inverter；8, micro-capacitance sensor.
Specific implementation mode
In the following, in conjunction with attached drawing and specific implementation mode, the present invention is described further：
As depicted in figs. 1 and 2, a kind of distributed photovoltaic and unidirectional from energy storage inversion system, including photovoltaic array, BOOST
Translation circuit, MPPT maximum power point tracking MPPT devices, energy-storage system, DC bus and off-network controller and off-network inverter and
Micro-capacitance sensor.
The output energy of the photovoltaic array passes sequentially through BOOST monotonic transformations circuit and MPPT maximum power point tracking MPPT dresses
Postpone and be connected in DC bus, the energy-storage system parallel connection accesses DC bus, DC bus by and off-network inverter with
Micro-capacitance sensor is connected, and micro-capacitance sensor forms grid-connect mode with major network connection, and micro-capacitance sensor forms off-network pattern with major network disconnection；It is described simultaneously
Off-network controller is connected with simultaneously off-network inverter, and off-network controller carries out isolated island detection to micro-capacitance sensor, and is tied according to detection
Fruit automatically switches grid-connect mode and off-network pattern.
Photovoltaic array is the basic link of grid-connected photovoltaic system, it is by solar-energy photo-voltaic cell monomer string and to seal
Component is dressed up, further according to the needs of system, connects and is mounted on holder by series and parallel and constitute, photovoltaic array is by solar energy
It is converted into the energy conversion unit of electric energy.
MPPT maximum power point tracking (MPPT) device is the necessary controlling unit for ensureing photovoltaic energy and making full use of, photovoltaic array
With strong nonlinear characteristic, the influence of the factors such as its output is directly illuminated by the light, temperature, load, MPPT maximum power point tracking
Control can ensure that photovoltaic battery array can export corresponding maximum power always in any condition, realize photovoltaic energy
It makes full use of；MPPT (MPPT maximum power point tracking) technology is to make full use of the technology of photovoltaic cell component energy indispensability, by not
Disconnected voltage (voltage control) or electric current (current control) to photovoltaic array carries out disturbance by a small margin, calculates its output work in real time
The variation of rate, to gradually realize the tracking of maximum power point.And the present embodiment proposes the photovoltaic based on dynamic impedance matching
Battery MPPT strategy, the method for introducing centered difference keep it more accurate to the detection of motional impedance, and the general of motional impedance
It reads in the light storage control method for coordinating being applied to, according to MPPT state changes when adjusting motional impedance, realizes that photovoltaic is sent out in light storage
The coordination of electric system energy-storage system controls；Dynamic impedance matching MPPT modes based on central difference method, it is right that reference value passes through
The real-time detection of the output end voltage, electric current of photovoltaic array is calculated, and nonlinear internal resistance is equivalent to when external condition changes
Anti- parameter change, as long as terminal voltage and the accuracy of detection of electric current are enough, motional impedance can be obtained accurately, be not in similar
The phenomenon that " erroneous judgement ".
In order to solve the problem of management of the photovoltaic micro battery output power under photovoltaic generating system maximal power tracing operating mode,
Inhibit the changed power caused by external condition, is a good solution in DC side configuration energy storage device.
Energy-storage system is the adjusting of grid-connected photovoltaic system, controlling unit, it is when illumination well generates electricity abundance by portion
Point electric energy stores, and is supplied further according to needing to discharge this part electric energy at the appropriate time and playing stable photo-voltaic power supply and export and adjust
The effect of coulomb balance.The energy-storage system includes accumulator and bidirectional DC-DC converter circuit, and the accumulator passes through two-way
DC-DC conversion circuit accesses in DC bus.The bidirectional DC-DC converter circuit uses buck/boost circuits, including four
NPN triode T1, T2, T3 and T4, super capacitor and two inductance L1 and L2, described NPN triode T1, T2, T3 and T4 are in parallel,
After the inductance L1 is connected with accumulator in the parallel branch of access NPN triode, the super capacitor is connected with inductance L2
It is incorporated to the collector and emitter both ends of NPN triode T4 afterwards.
Wherein, super capacitor is mainly responsible for system power fluctuation moment Fast-Balance system power, after stablizing mainly still
Play main energy storage by accumulator.In terms of accumulator and super capacitor hybrid energy-storing coordination control strategy, need as possible
It avoids battery-operated in frequent charging and discharging state, while reducing the electric current of accumulator cell charging and discharging.Super capacitor has power
The high advantage of density can be sent out or be absorbed with the short time charging or discharging current that is high-power, and allowing larger, can just make up electric power storage
Pond is not suitable for the shortcomings that high current charge-discharge.The cycle-index of super capacitor charge and discharge simultaneously is very high, and depth of discharge is reachable
100%, and memory-less effect, it can preferably alleviate the frequent charge and discharge of accumulator.
Described and off-network controller is as follows to the charge and discharge control mode of energy-storage system：
S1：Acquisition photovoltaic array is operated in the output power P of maximum power pointpv, and by maximum power point of photovoltaic array
Output power PpvWith power P needed for micro-capacitance sensorrefIt is compared；
S2：To the voltage U of accumulator in energy-storage systembatIt is acquired, and by the voltage U of accumulatorbatWith accumulator
Driving voltage UB, relIt is compared；
S3：The comparison result of combining step S1 and step S2 select four kinds of different operating modes, root according to comparison result
The charge status of accumulator is controlled according to operating mode；Wherein comparison result and its corresponding operating mode situation is as follows：
Operating mode 1：Work as Ppv>Pref, Ubat<UB, relWhen, BOOST monotonic transformation circuits are operated in MPPT patterns；It is two-way
DC-DC conversion circuit is then operated in buck (decompression) pattern, and accumulator charges at this time；
Operating mode 2：Work as Ppv>Pref, Ubat>UB, relWhen, BOOST monotonic transformation circuits are operated in constant power mode；It is two-way
DC-DC conversion circuit does not work；
Operating mode 3：Work as Ppv<Pref, Ubat>UB, relWhen, BOOST monotonic transformation circuits are operated in MPPT patterns；It is two-way
DC-DC conversion circuit is then operated in boost (boosting) pattern, at this time battery discharging；
Operating mode 4：Work as Ppv<Pref, Ubat<UB, relWhen, BOOST monotonic transformation circuits are operated in constant power mode；It is two-way
DC-DC conversion circuit does not work.
Further, and the effect of off-network inverter is to be by the lower DC conversion of voltage that photovoltaic array is sent out
The suitable alternating current of voltage class, necessary requirement is provided for parallel network power generation.Described and off-network inverter includes three-phase inversion
Circuit and three-phase filter inductance composition, there are six switch, each two switch one phase bridge arms of composition, per phase for the three-phase inverting circuit
The switch of bridge arm is all operated in complementary state.
Further, described and off-network controller is switched to grid-connect mode in micro-capacitance sensor the control mode of off-network pattern
For：
S1：Under grid-connect mode, major network passes through MPPT maximum power point tracking MPPT to the load supplying being connected in micro-capacitance sensor
Photovoltaic array is adjusted to maximum output by device, and energy-storage system is in charged state；
S2：When detecting external power supply failure using isolated island detection technique, isolated island detection is realized by simultaneously off-network controller
With overall isolation, then use current control mode, by the lead lag relationship of grid-connected front and back micro-capacitance sensor voltage phase angle, gradually
It adjusts its output voltage phase angle to coincide with network voltage, realize grid-connected to off-grid switching；
S3：Under off-network pattern, energy-storage system is to load supplying.
Further, described and off-network controller is to off-network pattern switching in micro-capacitance sensor to the control mode of grid-connect mode
For：
S1：Under off-network pattern, energy-storage system is to load supplying；
S2：When detecting external power supply fault recovery using isolated island detection technique, using V/f control modes to entire isolated
Micro-capacitance sensor voltage magnitude and phase reference are provided, by and off-network inverter output voltage and its phase according to voltage magnitude and
Phase reference is adjusted, and realizes off-network to grid-connected seamless switching；
S3：Under grid-connect mode, major network passes through MPPT maximum power point tracking MPPT to the load supplying being connected in micro-capacitance sensor
Photovoltaic array is adjusted to maximum output by device, and energy-storage system is in charged state.
Wherein present invention employs detected based on isolated island and off-network switching control technology and advanced dq digital servo-controls skills
Art.Under normal circumstances, system controls photovoltaic to station internal loading power supply, is then sent to power grid is counter if any dump energy.Work as external power supply
When failure, system switches to off-grid operation state, in handoff procedure, using quick isolated island detection technique, by and from
Net controller realizes the detection of quick isolated island and overall isolation, realizes by grid-connected to off-network seamless switching, it is ensured that important load not between
Cut-off electricity, switching time are less than 5ms.Under the conditions of off-grid operation, off-network energy is realized by the way that simultaneously off-network controller coordinate commander is lower
Management of balance function is measured, is combined with wind-force, photovoltaic array itself control by controlling backstage, realizes that hair electricity when off-network exists
Reach Fast-Balance in safe range.When external power supply restores electricity, system switches to grid-connected state.
Before grid-connected, by the lead lag relationship of grid voltage phase-angle, its output voltage phase angle and electricity are gradually adjusted
Net voltage coincide, then controls grid-connected switch with the control mode of voltage source converter and put into.Pass through after input the of short duration time, then
The control model of simultaneously off-network inverter is switched to current-mode control mode by voltage mode control mode.Meanwhile in order to reduce electricity
Stream impact, the given value of current of current-mode control mode progressively increase to stable state given value from a relatively low value.
When major network breaks down suddenly or artificially needs to cut off power grid, power grid should rapidly change control strategy, realize
Off-network seamless switching.At this point, the electric network voltage phase of power grid detection handoff procedure previous moment, as simultaneously off-network inverter off-network
The voltage-phase initial value that voltage source converter controls under pattern, in off-network moment, while it is V/f electricity to switch simultaneously off-network inverter
Die mould control mode.
By effective multiplexing of above-mentioned functional unit, realizes charging energy-storing, electric discharge inversion, off-grid operation, is incorporated into the power networks
The interaction of equal multiple-working modes.Occasion of the program especially suitable for Distributed Application, especially areas without electricity or electric power are not
Stablize area.
Parallel network reverse operating mode：
When sunny, solar energy is after photovoltaic array, and (current source is former by simultaneously off-network inverter inversion for the energy of output
Reason), it is directly incorporated into AC network, while the energy storage to charge the battery of extra energy；
When sunlight deficiency, solar energy is after photovoltaic is most low-priced, and (current source is former by simultaneously off-network inverter inversion for the energy of output
Reason), it is incorporated to AC network, insufficient energy is supplemented by accumulator；
Off-network operating mode：
In electric network power-fail or exception, and off-network inverter automatically switches to off-network operating mode (voltage source principle), real
Existing DC-AC inversion bands carry.The access of solar energy at this time plays the role of supplementing energy, can effectively extend the standby of accumulator
Time reduces battery discharge depth, extends battery life, while decreasing the configuration requirement of accumulator, is promoted convenient for batch.
Storage energy operation pattern：
The function of " peak load shifting " may be implemented.In power grid electricity price low ebb, and off-network inverter can be according to setting, automatically
It is switched to the operating status of hf rectifier, realizes the reverse charging function of power grid, reaches the effect of " low ebb charges, crest discharge "
Energy.Can be that user brings additional income, while also subtracting by this operational mode because of the difference of different periods electricity price
Few network load allowance, is also beneficial to the stabilization of power grid.
It will be apparent to those skilled in the art that technical solution that can be as described above and design, make various other
Corresponding change and deformation, and all these changes and deformation should all belong to the protection domain of the claims in the present invention
Within.
Claims (7)
1. a kind of distributed photovoltaic and from energy storage inversion system, which is characterized in that including photovoltaic array, BOOST monotonic transformation electricity
Road, MPPT maximum power point tracking MPPT devices, energy-storage system, DC bus and off-network controller and off-network inverter and micro- electricity
Net；After the output energy of the photovoltaic array passes sequentially through BOOST monotonic transformations circuit and MPPT maximum power point tracking MPPT devices
It is connected in DC bus, the energy-storage system parallel connection accesses DC bus, and DC bus passes through simultaneously off-network inverter and micro- electricity
Net is connected, and micro-capacitance sensor forms grid-connect mode with major network connection, and micro-capacitance sensor forms off-network pattern with major network disconnection；Described and off-network
Controller is connected with simultaneously off-network inverter, and off-network controller carries out isolated island detection to micro-capacitance sensor, and right according to testing result
Grid-connect mode and off-network pattern are automatically switched.
2. distributed photovoltaic according to claim 1 and from energy storage inversion system, which is characterized in that the energy-storage system packet
Accumulator and bidirectional DC-DC converter circuit are included, the accumulator is accessed by bidirectional DC-DC converter circuit in DC bus.
3. distributed photovoltaic according to claim 2 and from energy storage inversion system, feature is being, the two-way DC-
DC translation circuits use buck/boost circuits, including four NPN triodes T1, T2, T3 and T4, super capacitor and two inductance
L1 and L2, described NPN triode T1, T2, T3 and T4 are in parallel, and the inductance L1 accesses NPN triode after being connected with accumulator
Parallel branch on, the super capacitor is incorporated to the collector and emitter both ends of NPN triode T4 after connecting with inductance L2.
4. distributed photovoltaic according to claim 1 and from energy storage inversion system, which is characterized in that described and off-network inversion
Device includes three-phase inverting circuit and three-phase filter inductance composition, and there are six switch, each two switching groups for the three-phase inverting circuit
Cheng Yixiang bridge arms are all operated in complementary state per the switch of phase bridge arm.
5. distributed photovoltaic according to claim 1 and from energy storage inversion system, which is characterized in that described and off-network controls
Device is as follows to the charge and discharge control mode of energy-storage system：
S1：Acquisition photovoltaic array is operated in the output power P of maximum power pointpv, and by the output of maximum power point of photovoltaic array
Power PpvWith power P needed for micro-capacitance sensorrefIt is compared；
S2：To the voltage U of accumulator in energy-storage systembatIt is acquired, and by the voltage U of accumulatorbatWith the excitation of accumulator
Voltage UB, relIt is compared；
S3：The comparison result of combining step S1 and step S2 select four kinds of different operating modes, according to work according to comparison result
Operation mode controls the charge status of accumulator；Wherein comparison result and its corresponding operating mode situation is as follows：
Operating mode 1：Work as Ppv>Pref, Ubat<UB, relWhen, BOOST monotonic transformation circuits are operated in MPPT patterns；Bi-directional DC-DC becomes
It changes circuit and is then operated in buck (decompression) pattern, accumulator charges at this time；
Operating mode 2：Work as Ppv>Pref, Ubat>UB, relWhen, BOOST monotonic transformation circuits are operated in constant power mode；Bi-directional DC-DC
Translation circuit does not work；
Operating mode 3：Work as Ppv<Pref, Ubat>UB, relWhen, BOOST monotonic transformation circuits are operated in MPPT patterns；Bi-directional DC-DC becomes
It changes circuit and is then operated in boost (boosting) pattern, at this time battery discharging；
Operating mode 4：Work as Ppv<Pref, Ubat<UB, relWhen, BOOST monotonic transformation circuits are operated in constant power mode；Bi-directional DC-DC
Translation circuit does not work.
6. distributed photovoltaic according to claim 1 and from energy storage inversion system, which is characterized in that described and off-network controls
The control mode that device is switched to grid-connect mode in micro-capacitance sensor off-network pattern is：
S1：Under grid-connect mode, major network passes through MPPT maximum power point tracking MPPT devices to the load supplying being connected in micro-capacitance sensor
Photovoltaic array is adjusted to maximum output, energy-storage system is in charged state；
S2：When detecting external power supply failure using isolated island detection technique, by and off-network controller realize isolated island detection with it is whole
Body is isolated, then is gradually adjusted by the lead lag relationship of grid-connected front and back micro-capacitance sensor voltage phase angle using current control mode
Its output voltage phase angle coincide with network voltage, realizes grid-connected to off-grid switching；
S3：Under off-network pattern, energy-storage system is to load supplying.
7. distributed photovoltaic according to claim 1 and from energy storage inversion system, which is characterized in that described and off-network controls
Device is to the control mode of off-network pattern switching to grid-connect mode in micro-capacitance sensor：
S1：Under off-network pattern, energy-storage system is to load supplying；
S2：It is micro- to what is entirely isolated using V/f control modes when detecting external power supply fault recovery using isolated island detection technique
Power grid provides voltage magnitude and phase reference, by the simultaneously output voltage of off-network inverter and its phase according to voltage magnitude and phase
Benchmark is adjusted, and realizes off-network to grid-connected seamless switching；
S3：Under grid-connect mode, major network passes through MPPT maximum power point tracking MPPT devices to the load supplying being connected in micro-capacitance sensor
Photovoltaic array is adjusted to maximum output, energy-storage system is in charged state.
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