CN108233396A - A kind of Unified Power Quality Controller and its control method with light storage unit - Google Patents
A kind of Unified Power Quality Controller and its control method with light storage unit Download PDFInfo
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- CN108233396A CN108233396A CN201810213240.8A CN201810213240A CN108233396A CN 108233396 A CN108233396 A CN 108233396A CN 201810213240 A CN201810213240 A CN 201810213240A CN 108233396 A CN108233396 A CN 108233396A
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- 238000011217 control strategy Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 6
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
- H02J3/1814—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators wherein al least one reactive element is actively controlled by a bridge converter, e.g. unified power flow controllers [UPFC]
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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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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- H02J3/383—
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- H02J3/385—
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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
- Y02E40/30—Reactive power compensation
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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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Inverter Devices (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a kind of Unified Power Quality Controllers and its control method with light storage unit, it is characterized in that the series unit of close substation's mains side including being used for the improvement of quality of voltage problem, the parallel units for the improvement of current quality problem and grid-connected close load-side, the DC bus capacitor stablized for maintenance voltage and direct current component and processor unit.Advantage：1) can effectively solve the problems, such as power grid tip it is grid-connected caused by power quality severe exacerbation, UPQC is made to have certain uninterruptible power supply ability simultaneously because adding photovoltaic array and energy-storage battery, promotes the power quality and power supply reliability of power grid；2) UPQC and photovoltaic DC-to-AC converter have been merged, it is notable to reduce equipment cost, reduce overhaul of the equipments difficulty；3) make grid-connected power stability, no longer change and moment variation with intensity of illumination, reduce the possibility of power grid bi-directional current, be conducive to power grid operation.
Description
Technical field
The present invention relates to a kind of Unified Power Quality Controller (Unified Power Quality with light storage unit
Controller, UPQC) and its control method, belong to electrical equipment technical field.
Background technology
Photovoltaic generation is because its advantage such as environmental-friendly, renewable becomes one of developing direction of current and following power generation.
For reasonable distribution electric energy, grid-connected is main solution route.However because go out photovoltaic generation the characteristics of solar energy
Power has very strong randomness and fluctuation, and then influences the direction of tide in power grid.A large amount of photovoltaic accesses will cause more serious
Reversal tidal current, the pressure drop that photovoltaic electric stream is generated by feed line impedance will make load side voltage higher than transformer substation side, may cause
Load side voltage out-of-limit.In addition, the variation of photovoltaic output current can also cause voltage fluctuation, and the photovoltaic array of the same area is sent out
The influence that electrical power is illuminated by the light variation is with uniformity, this fluctuation that will aggravate voltage.
Grid-connected at present mainly to be connect by inverter with power grid, gird-connected inverter is typical non-linear electric power electricity
Sub-device.And it is grid-connected generally take pure active power grid-connected, i.e., power factor be 1, do not have Reactive-power control ability.Photovoltaic
Gird-connected inverter and its control strategy can inject a large amount of harmonic currents to power grid under the non-rated power of inverter and consume idle
Power.
It is particularly grid-connected in power grid tip, the above situation is more serious.At present, corresponding solution mainly has
Dynamic electric voltage recovery device (DVR), Active Power Filter-APF (APF), static reactive generator (SVG) etc., but due to these
Functions of the equipments are single, and in order to reduce cost and realize that function is integrated, UPQC becomes as comprehensive power quality controlling device
One very promising power electronic equipment.
Invention content
The technical problems to be solved by the invention are the defects of overcoming the prior art, provide a kind of system with light storage unit
One electric energy quality controller and its control method have merged traditional photovoltaic combining inverter and power quality controlling device and nothing
Reactive power compensation installations, can effectively solve the grid-connected power quality problem brought of power grid tip, and it is significant reduce equipment into
This, is conducive to the stabilization of power grid.
In order to solve the above technical problems, the present invention provides a kind of Unified Power Quality Controller with light storage unit,
It is characterized in, close substation's power supply including being used for quality of voltage problem (Voltage Drop, flickering, asymmetry, distortion etc.) improvement
The series unit of side is administered and is leaned on grid-connected for current quality problem (current harmonics, reactive current, asymmetric electric current)
The parallel units of nearly load-side, for maintaining the DC bus capacitor of DC-side Voltage Stabilization and direct current component；
The series unit includes the first transverter and three identical output LC wave filters, first transverter include
Six switch transistor Ts11~T16, it is two-by-two one group, every group of two switching tubes are connected, parallel with one another between every group, three phase mains
Each one output LC wave filter of corresponding connection, the output LC wave filters include inductance LsrWith capacitance Csr, three phase mains
Any one phase connects the inductance L of its corresponding output LC wave filter respectivelysrWith capacitance CsrOne end, inductance LsrThe other end connect
Two switching tube tie points being connected in one of which switching tube, and pass through inductance L per phasesrIt does not repeat to be connected to same group of switch
Pipe, capacitance CsrThe other end be connected to load；
The parallel units include the second transverter and three identical output LC wave filters, second transverter include
Six switch transistor Ts21~T26, it is two-by-two one group, every group of two switching tubes are connected, parallel with one another, the defeated people LC between every group
Wave filter includes an inductance Lsh, each inductance LshOne end be correspondingly connected with a phase in three phase mains, the other end is connected to
Two switching tube tie points in two transverter one of which switching tubes, and pass through inductance L per phasesrIt does not repeat to be connected to same group
Switching tube；
The DC bus capacitor is by two capacitance CDC1And CDC2It is composed in series, tie point and the substation's power supply of two capacitances
Neutral point N connections, capacitance CDC1And CDC2It is in parallel with the first transverter and the second transverter after series connection；
The direct current component is made of photovoltaic cells and energy-storage units in the form of serial or parallel connection, and direct current component with it is straight
It is in parallel to flow lateral capacitance, for wherein photovoltaic cells for converting photovoltaic energy, energy-storage units are used to buffer the amplitude of variation of photovoltaic energy；
Processor is further included, the processor connects respectively with series unit, parallel units, DC bus capacitor and direct current component
It connects, for selecting UPQC operating modes or grid-connected operating mode, when intensity of illumination is stronger, which works at the same time
Under UPQC operating modes and grid-connected operating mode, and realize photovoltaic array MPPT (maximal power tracing)；Intensity of illumination is low
When certain value, which only chooses UPQC operating modes.
Further, the UPQC operating modes handle the power quality problem of voltage and current by controller synthesis, mend
It repays idle, and there is UPS (uninterruptible power supply), energy is provided jointly by photovoltaic cells and energy-storage units when playing UPS functions
Amount.
Further, the photovoltaic cells are only made of photovoltaic array or by photovoltaic arrays and Boost circuit (boost chopper
Circuit) composition；The energy-storage units are only made of energy-storage battery group or are made of energy-storage battery and two-way DC/DC circuits.
Further, the grid-connected operating mode is realized by photovoltaic array by parallel units grid-connected；If photovoltaic list
Member then realizes photovoltaic array MPPT without Boost circuit by parallel units；If photovoltaic cells have Boost circuit, by Boost electricity
Realize photovoltaic array MPPT in road.
A kind of control method of the Unified Power Quality Controller with light storage unit, it is characterized in that, include the following steps：
1) the network voltage v that will be detectedS, load current iL, series unit output voltage vsr, parallel units output current
ish, DC capacitor voltage vDCWith photovoltaic voltage vPV, photovoltaic electric current iPVSignal is input to processor；
2) processor uses instantaneous power detection method and grid-connected PQ control methods, and PQ control strategies output fundamental wave has
Work(electric current i1Grid-connected instruction current i is synthesized jointly with the electric current that instantaneous power detection method obtainssh */ish *', while acquisition instruction
Voltage signal vsr, ish */ish *' and ish/ishIt is modulated after ' compensated network I with carrier wave, then triggers the six of parallel units
A switch transistor T21~T26, wherein, ish *′、ish' be respectively intensity of illumination be more than certain value when, work at the same time in UPQC Working moulds
Under formula and grid-connected operating mode, the command value and actual value of parallel units when occurring grid-connected；ish *、ishRespectively light
When being less than certain value according to intensity, only UPQC operating modes, the current instruction value of parallel units and grid-connected during without grid-connected generation
Actual value, at this time i1=0, the voltage instruction value of series unit, real output value difference are equal under two kinds of operating modes, respectively
vsr *、vsr, it is modulated with carrier wave after the compensated network II of the two, then triggers six switch transistor Ts of series unit11~T16。
Further, the compensation network I uses PI controllers, reduces the mistake of compensated voltage instruction value and real output value
Difference.
Further, the use of the compensation network II PI controllers, reduction compensation current instruction value and real output value
Error.
The advantageous effect that the present invention is reached：
1) can effectively solve the problems, such as power grid tip it is grid-connected caused by power quality severe exacerbation, simultaneously because add in
Photovoltaic array and energy-storage battery make UPQC have certain uninterruptible power supply ability, promote power quality and the power supply of power grid
Reliability；
2) UPQC and photovoltaic DC-to-AC converter have been merged, it is notable to reduce equipment cost, and run due to tables of equipment one steady
It is qualitative to be improved, reduce overhaul of the equipments difficulty；
3) make grid-connected power stability, no longer change and moment variation with intensity of illumination, reduce power grid bi-directional current
May, be conducive to power grid operation.
Description of the drawings
Fig. 1 is the Unified Power Quality Controller circuit diagram proposed by the present invention with light storage unit；
Fig. 2 is direct current component schematic diagram, and Fig. 2 (a) is the light storage unit being composed in series by photovoltaic cells and energy-storage units, figure
2 (b) is the light storage unit composed in parallel by photovoltaic cells and energy-storage units；
Fig. 3 is photovoltaic cells circuit diagram, and wherein Fig. 3 (a) is the light being only made of photovoltaic array (no Boost circuit)
Unit is lied prostrate, Fig. 3 (b) is the photovoltaic cells of photovoltaic array and Boost circuit composition；
Fig. 4 is energy-storage units circuit diagram, and wherein Fig. 4 (a) is only to be made of energy-storage battery group (No DC/DC circuits)
Energy-storage units, the energy-storage units that Fig. 4 (b) is made of energy-storage battery group and two-way DC/DC circuits；
Fig. 5 chooses schematic diagram for two kinds of operating modes of UPQC operating modes and grid-connected pattern；
Fig. 6 is system controller structure diagram.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and be not intended to limit the protection scope of the present invention and limit the scope of the invention.
As shown in Figure 1, the Unified Power Quality Controller proposed by the present invention with light storage unit, structure such as Fig. 1 institutes
Show, including series unit, parallel units, DC bus capacitor and direct current component, series unit passes through in the output filter LC that connects
Filter capacitor seal in power grid, close to mains side；Parallel units are directly incorporated into power grid, close to load-side；Direct current component is by photovoltaic
Unit and energy-storage units composition, are connected in parallel on UPQC DC bus capacitors both ends.
The series unit includes the first transverter and three identical output LC wave filters, first transverter include
Six switch transistor Ts11~T16, wherein switch transistor T11、T14Series connection, switch transistor T13、T16Series connection, switch transistor T15、T12Phase again after series connection
Mutually in parallel, each corresponding one output LC wave filter of connection of three phase mains, the output LC wave filters include inductance LsrWith
Capacitance Cs, any one phase of three phase mains connects the inductance L of its corresponding output LC wave filter respectivelysrWith capacitance CsOne end,
Inductance LsrOther end connecting valve pipe T11、T14Or switch transistor T13、T16Or switch transistor T15、T12Common end, and per mutually passing through
Inductance LsrIt does not repeat to connect same common end, capacitance CsThe other end be connected to load；
The parallel units include the second transverter and three identical input LC wave filters, second transverter include
Six switch transistor Ts21~T26, wherein switch transistor T21、T24Series connection, switch transistor T23、T26Series connection, switch transistor T25、T22Phase again after series connection
Mutually in parallel, the defeated people LC wave filters include an inductance Lsh, each inductance LshOne end be correspondingly connected in three phase mains one
Phase, other end connecting valve pipe T21、T24Or switch transistor T23、T26Or switch transistor T25、T22Common end, and per mutually pass through inductance Lsh
It does not repeat to connect same common end；
In the present embodiment, the switching tube uses IGBT switching tubes (insulated gate bipolar transistor).
The above-mentioned Unified Power Quality Controller with light storage unit, the direct current component is by photovoltaic cells and energy storage
Unit is connected, as shown in Fig. 2 (a).Can also be in parallel by photovoltaic cells and energy-storage units, as shown in Fig. 2 (b).
The above-mentioned Unified Power Quality Controller with light storage unit, the photovoltaic cells can be only by photovoltaic arrays
(no Boost circuit) forms, as shown in Fig. 3 (a).It can also be made of photovoltaic array and Boost circuit, as shown in Fig. 3 (b).
The above-mentioned Unified Power Quality Controller with light storage unit, the energy-storage units can by energy-storage battery with
Filter capacitor forms, as shown in Fig. 4 (a).It can also be made of energy-storage battery and two-way DC/DC circuits, as shown in Fig. 4 (b).
The control strategy of Unified Power Quality Controller proposed by the present invention includes UPQC operating modes and grid-connected work
Operation mode selects different operating modes according to actual conditions, and photovoltaic array keeps grid-connected power with energy-storage battery cooperation
Stablize.When intensity of illumination is stronger, which works at the same time under UPQC patterns and grid-connected pattern, and realizes photovoltaic array
MPPT；When intensity of illumination is less than certain value, which only chooses UPQC patterns.Its structure diagram is as shown in Figure 5.
Above-mentioned Unified Power Quality Controller control strategy, the UPQC operating modes handle electricity by controller synthesis
Power quality problem, the compensating reactive power of pressure and electric current, and there is UPS.
Above-mentioned Unified Power Quality Controller control strategy, the grid-connected operating mode (photovoltaic array MPPT)
It is realized by photovoltaic array by parallel units grid-connected.If photovoltaic cells realize photovoltaic without Boost circuit by parallel units
MPPT；If photovoltaic cells have Boost circuit, photovoltaic MPPT is realized by Boost circuit.
Below in conjunction with attached drawing, the Unified Power Quality Controller proposed by the present invention with light storage unit and control is discussed in detail
The operation principle and the course of work of method processed：
When intensity of illumination is less than certain value, which starts UPQC operating modes, such as the Working mould the upper surface of in Fig. 5
Formula --- UPQC patterns, series unit solve voltage power quality problems, and side in parallel solves electric current power quality problem.Controller
There is no the exchanging of active power (assuming that UPQC is not lost, three-phase system balance and voltage magnitude is normal), energy storage electricity with power grid
Pond group and DC bus capacitor CDCDC-side Voltage Stabilization is maintained, when occurring to have a power failure or during Voltage Drop, from energy-storage battery to negative
It carries and energy is provided, play the UPS functions of UPQC.When intensity of illumination is more than certain value, photovoltaic array starts to generate electricity, and starts to start
It is grid-connected, controller switching control pattern, such as operating mode following in Fig. 5, i.e. the grid-connected patterns of UPQC+, and receipts or other documents in duplicate
Electric current from member to power network compensation by ishBecome ish', wherein when containing UPQC operating modes to the reactive current of power network compensation and
Inhibit the harmonic current of harmonic wave and the grid-connected fundamental active current injected to power grid.Due to the cooperation of energy-storage battery,
By controlling energy-storage battery charge-discharge electric power, grid-connected power is made to stablize relatively, is conducive to the stabilization of power grid terminal voltage
With the stabilization of system.Wherein, when photovoltaic cells are without Boost circuit, DC voltage is adjusted by parallel units control and realizes photovoltaic
MPPT；When using the circuit structure for having Boost, photovoltaic MPPT is realized by Boost circuit.
The specific implementation of control method, as shown in fig. 6, network voltage v will be detectedS, load current iL, series unit
Output voltage vsr, parallel units output current ish, DC capacitor voltage vDCWith photovoltaic voltage vPV, photovoltaic electric current iPVSignal is defeated
Enter to controller.Controller uses instantaneous power detection method and grid-connected PQ control strategies, PQ control strategies output fundamental wave
Watt current i1Grid-connected instruction current i is synthesized jointly with the electric current that instantaneous power detection method obtainssh *(ish *'), it obtains simultaneously
Command voltage signal vsr, ish *(ish *') and ish(ish') compensated network I (such as PI controllers) is modulated afterwards with carrier wave, so
Six switching tubes of parallel units are triggered afterwards.Wherein, ish *′、ish' for intensity of illumination be more than certain value when (UPQC+ is grid-connected
Pattern), the current instruction value and actual value of parallel units when occurring grid-connected；ish *、ishWhen being less than certain value for intensity of illumination
(only UPQC patterns), the current instruction value of parallel units and grid-connected actual value during without grid-connected generation, at this time i1=0.Two kinds
The voltage instruction value of series unit, real output value are equal under pattern, respectively vsr *、vsr, after the compensated network II of the two with load
Wave is modulated, and then triggers six switching tubes of series unit.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformation can also be made, these are improved and deformation
Also it should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of Unified Power Quality Controller with light storage unit, it is characterized in that, it is administered including being used for quality of voltage problem
Close substation's mains side series unit, for current quality problem administer and grid-connected close load-side parallel connection
Unit, for maintaining the DC bus capacitor of DC-side Voltage Stabilization and direct current component；
The series unit includes the first transverter and three identical output LC wave filters, and first transverter includes six
Switch transistor T11~T16, be two-by-two one group, the series connection of every group of two switching tubes is parallel with one another between every group, three phase mains it is each
Corresponding one output LC wave filter of connection, the output LC wave filters include inductance LsrWith capacitance Csr, three phase mains it is arbitrary
One phase connects the inductance L of its corresponding output LC wave filter respectivelysrWith capacitance CsrOne end, inductance LsrThe other end be connected to
Two switching tube tie points in one of which switching tube, and pass through inductance L per phasesrIt does not repeat to be connected to same group of switching tube,
Capacitance CsrThe other end be connected to load；
The parallel units include the second transverter and three identical output LC wave filters, and second transverter includes six
Switch transistor T21~T26, it is two-by-two one group, every group of two switching tubes are connected, parallel with one another between every group, the defeated people LC filtering
Device includes an inductance Lsh, each inductance LshOne end be correspondingly connected with a phase in three phase mains, the other end is connected to second and changes
Two switching tube tie points in device one of which switching tube are flowed, and pass through inductance L per phasesrIt does not repeat to be connected to same group of switch
Pipe；
The DC bus capacitor is by two capacitance CDC1And CDC2It is composed in series, in the tie point of two capacitances and substation's power supply
Property point N connections, capacitance CDC1And CDC2It is in parallel with the first transverter and the second transverter after series connection；
The direct current component is made of photovoltaic cells and energy-storage units in the form of serial or parallel connection, and direct current component and DC side
Capacitance is in parallel, and for wherein photovoltaic cells for converting photovoltaic energy, energy-storage units are used to buffer the amplitude of variation of photovoltaic energy；
Processor is further included, the processor is connect respectively with series unit, parallel units, DC bus capacitor and direct current component,
For selecting UPQC operating modes or grid-connected operating mode, when intensity of illumination is stronger, which works at the same time
Under UPQC operating modes and grid-connected operating mode, and realize photovoltaic array MPPT；When intensity of illumination is less than certain value, the control
Device processed only chooses UPQC operating modes.
2. a kind of Unified Power Quality Controller with light storage unit according to claim 1, it is characterized in that, it is described
UPQC operating modes are handled power quality problem, the compensating reactive power of voltage and current by controller synthesis, and have the function of UPS,
Energy is provided jointly by photovoltaic cells and energy-storage units when playing UPS functions.
3. a kind of Unified Power Quality Controller with light storage unit according to claim 1, it is characterized in that, the light
Volt unit is only made of photovoltaic array or is made of photovoltaic array and Boost circuit；The energy-storage units are only by energy-storage battery group
Composition is made of energy-storage battery and two-way DC/DC circuits.
4. a kind of Unified Power Quality Controller with light storage unit according to claim 3, it is characterized in that, the light
Grid-connected operating mode is lied prostrate, is realized by photovoltaic array by parallel units grid-connected；If photovoltaic cells are without Boost circuit, by parallel connection
Unit realizes photovoltaic array MPPT；If photovoltaic cells have Boost circuit, photovoltaic array MPPT is realized by Boost circuit.
5. a kind of control method of Unified Power Quality Controller with light storage unit according to claim 1, special
Sign is to include the following steps：
1) the network voltage v that will be detectedS, load current iL, series unit output voltage vsr, parallel units output current ish、
DC capacitor voltage vDCWith photovoltaic voltage vPV, photovoltaic electric current iPVSignal is input to processor；
2) processor uses instantaneous power detection method and grid-connected PQ control methods, PQ control strategies output fundamental active electricity
Flow i1Grid-connected instruction current i is synthesized jointly with the electric current that instantaneous power detection method obtainssh */ish *', while acquisition instruction voltage
Signal vsr, ish */ish *' and ish/ishIt is modulated after ' compensated network I with carrier wave, then trigger parallel units six open
Close pipe T21~T26, wherein, ish *′、ish' when being respectively that intensity of illumination is more than certain value, work at the same time in UPQC operating modes and
Under grid-connected operating mode, the command value and actual value of parallel units when occurring grid-connected；ish *、ishRespectively illumination is strong
When degree is less than certain value, only UPQC operating modes, the current instruction value of parallel units and grid-connected reality during without grid-connected generation
It is worth, at this time i1=0, the voltage instruction value of series unit, real output value distinguish equal, respectively v under two kinds of operating modessr *、
vsr, it is modulated with carrier wave after the compensated network II of the two, then triggers six switch transistor Ts of series unit11~T16。
6. a kind of control method of Unified Power Quality Controller with light storage unit according to claim 5, special
Sign is that the compensation network I uses PI controllers, reduces the error of compensated voltage instruction value and real output value.
7. a kind of control method of Unified Power Quality Controller with light storage unit according to claim 5, special
Sign is that the compensation network II uses PI controllers, reduces the error of compensation current instruction value and real output value.
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