CN107026463A - A kind of active parallel-connection type mixing energy storing system applied to photovoltaic generating system - Google Patents

A kind of active parallel-connection type mixing energy storing system applied to photovoltaic generating system Download PDF

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Publication number
CN107026463A
CN107026463A CN201610070869.2A CN201610070869A CN107026463A CN 107026463 A CN107026463 A CN 107026463A CN 201610070869 A CN201610070869 A CN 201610070869A CN 107026463 A CN107026463 A CN 107026463A
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power
energy
unit
inverter
triode
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周雪松
林怡彤
马幼捷
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Tianjin University of Technology
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Tianjin University of Technology
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • H02J3/382Dispersed generators the generators exploiting renewable energy
    • H02J3/383Solar energy, e.g. photovoltaic energy
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10Flexible AC transmission systems [FACTS]
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30Systems combining energy storage with energy generation of non-fossil origin

Abstract

A kind of active parallel-connection type mixing energy storing system applied to photovoltaic generating system, it is characterised in that it includes mixed energy storage system, biphase rectification/inverter unit, DSP control unit, power inverter A, power inverter B and energy storage grid-connected converter unit;It is advantageous in that:1. fast, accurately power adjusts the fluctuating power of photovoltaic generating system output in real time;2. there is high power density, high-energy-density, the characteristic of long circulation life;3. by two power inverters, energy is accurately distributed;4. calculated and data-handling capacity using the data of computer high speed, substantially increase the reliability of the control system.

Description

A kind of active parallel-connection type mixing energy storing system applied to photovoltaic generating system
(1) technical field:
The invention belongs to Power Electronic Technique and the crossing domain of power system energy storage technology, particularly apply In the active parallel-connection type mixing energy storing system of photovoltaic generating system.
(2) background technology:
In recent years, with the drastically consumption and the aggravation of environmental pollution of traditional energy, New Energy Industry is obtained Support to very big concern and energetically.Photovoltaic generation is as one of most cheap energy, and photovoltaic generation has been obtained extensively General application.However, natural light is influenceed tool by a variety of natural causes such as height above sea level, weather, temperature, landform Very strong uncontrollability, fluctuation and intermittence, and it is difficult to Accurate Prediction and a large amount of storages.With light Lie prostrate the increase of generated output proportion in power system, the fluctuation of photovoltaic generation power, it is intermittent with And uncontrollability can destroy the original power of power network and energy balance, and then to power network in planning construction, fortune Huge challenge is brought in terms of row scheduling and the quality of power supply.
Appropriate energy-storage system is configured in grid-connected photovoltaic system, the power output to wind power plant is adjusted, The controllability that photovoltaic generation is exerted oneself can be improved so that photovoltaic generating system turns into flexible controllable power supply.Work as light Lie prostrate generated output it is larger, but network load it is relatively low when, by power output of the energy-storage system to photovoltaic generating system Carry out long-time, the energy stores of Large Copacity;Treat that network load reaches peak value and photovoltaic generating system is gone out During power increase in demand, energy-storage system exports the energy stored to power network, for users to use.Energy-storage travelling wave tube The ability actively exchanged with photovoltaic generating system progress accurate power itself is not had, it is necessary to add discharge and recharge Controller, is accurately controlled the charge-discharge electric power of energy-storage travelling wave tube.Current single energy storage device can not be complete The requirement of full up sufficient engineering.Different energy storage modes is subjected to organic assembling, makes the energy storage of different energy storage modes Characteristic is able to complementation, can improve the overall performance of energy-storage system, while reducing the investment of energy-storage system, fortune Row cost.
Common energy-storage battery has lead-acid battery, good fortune nickel-based battery, Ni-H cell, buries ion battery etc..From following From the point of view of ring life-span, power density, the aspect of energy density three are evaluated, every kind of battery have its respective advantage with Deficiency, the characteristics of generally there is low specific power, high-energy-density, low circulation service life on the whole, this is just Limit application of the battery energy storage system in the larger occasion of load pulsation.Ultracapacitor is new in the last few years A kind of emerging power energy storage device, it has, and service life cycle length, operating temperature range is wide, discharge and recharge is fast Degree is fast, power density is big, the features such as energy density is relatively low.The above advantage of ultracapacitor just may be used It is effective complementary to be carried out with the shortcoming of battery.
This patent is proposed by the way of battery and ultracapacitor are used in mixed way storage electric energy.Which So that battery energy storage and the respective advantage of ultracapacitor energy storage are able to complementary wherein battery to meet great Rong The demand ultracapacitor that amount electric energy is handled up is to meet the demand that peak power is handled up.Using hybrid energy-storing side Formula is greatly improved energy-storage system on the premise of it can effectively save energy-storage system investment and volume, weight Overall performance, it is had broad application prospects in each production and living field in national economy.
(3) content of the invention:
It is an object of the invention to provide a kind of active parallel-connection type hybrid energy-storing system applied to photovoltaic generating system System, it can overcome the deficiencies in the prior art, be that a kind of simple in construction, stability is good, controllability by force mixed Close energy-storage system
Technical scheme:A kind of active parallel-connection type mixing energy storing system applied to photovoltaic generating system, Including photovoltaic system, it is characterised in that it includes mixed energy storage system, biphase rectification/inverter unit, DSP Controller unit, power inverter A, power inverter B and energy storage grid-connected converter unit;Wherein, The mixed energy storage system includes superconductive energy storage system and energy-storage system of accumulator, the energy storage grid-connected converter The AC of device unit is directly connected to power network, and its DC side is connected with biphase rectification/inverter unit;It is described Biphase rectification/inverter unit is connected with mixed energy storage system unit;The input of the dsp controller unit The output signal of photovoltaic system, power inverter B and mixed energy storage system, its output end point are gathered respectively Not Lian Jie energy storage grid-connected converter unit, power inverter A and power inverter B input.
Biphase rectification/the inverter unit is made up of power inverter A and power inverter B;Wherein institute Power inverter A sides are stated to be connected with the grid-connected rectification adverser unit of energy storage, opposite side respectively with power conversion Device B and super capacitor storage unit connection;The opposite side of the power inverter B and batteries to store energy unit Connection.
Biphase rectification/inverter unit of the energy-storage system is made up of controlled rectification circuit;The controlled rectification Circuit by turn-off thyristor or insulated gate bipolar IGCT class device for high-power power electronic and two poles Pipe parallel connection constitutes three phase rectifier bridge-type circuit;Its DC side is connected with power inverter A, AC and power network The output end connection of middle photovoltaic generating system.
The power inverter A and power inverter B be respectively by electric capacity C1, inductance L1, triode G1, Diode D1, electric capacity C2, diode D2, triode G2, inductance L2 and electric capacity C3 are constituted;Wherein, The triode G1 and triode G2 are in anti-phase connection;The electric capacity C2 is connected to triode G1 current collection Between pole and triode G2 colelctor electrode;The diode D1 is connected in parallel on triode G1 colelctor electrode and hair Between emitter-base bandgap grading;The colelctor electrode of inductance L1 one end connecting triode G1, the other end and the grid-connected rectification of energy storage The DC output end E1 connections of inverter unit;The electric capacity C1 is connected in parallel on inductance L1 and triode G1 two End;The diode D2 is connected in parallel between triode G2 collector and emitter;The inductance L2 mono- Hold connecting triode G2 colelctor electrode, the DC output end E2 connections of the other end and energy-storage units;The electricity Hold C3 and be connected in parallel on inductance L2 and triode G2 two ends.
The DSP control unit is control power inverter A and B and the grid-connected rectification adverser list of energy storage The core of member, is made up of TMS320F28335 control chips, drive circuit and sample circuit;It is described to adopt Input collection power network AC three-phase voltage, current signal and the bidirectional power current converter list of sample circuit The input terminal voltage current signal of member;The drive circuit is by receiving TMS320F28335 control chips Drive command controls power electronics in bidirectional power flow power converter cells and the grid-connected rectification adverser unit of energy storage The conducting and shut-off of switching device.
The DSP control unit is powered by power conversion chip TPS767D318 for it.
A kind of method of work of active parallel-connection type mixing energy storing system applied to photovoltaic generating system, its feature It is that it comprises the following steps:
1. when the power that photovoltaic system is sent is higher than power needed for power network, energy storage grid-connected converter unit starts Work, and in rectification state;
2. the electric energy of spilling is redistributed by power inverter A and power inverter B respectively;
3. the high-frequency energy in electric energy is absorbed by ultracapacitor energy storage unit, and batteries to store energy unit is then inhaled Receive low frequency energy;
4. when dsp controller, which detects the power that photovoltaic generating system sends, is higher by setting value, DSP controls Device control convertor circuit is allowed to be in rectification state, while detection power inverter A, power inverter B Inductance L1, inductance L2 electric current ILA、ILBAnd batteries terminal voltage Ubat, ultracapacitor group end electricity Press Ucap, control two power inverters to be allocated excessive electric energy;Ultracapacitor absorbs high-frequency energy, And battery absorbs low frequency energy.
4. middle dsp controller controls convertor circuit and power inverter specific steps including following several to the step Step:
1. analog-to-digital conversion signal is started;
2. controller is initialized;
3. voltage, electric current to AC and DC side and super capacitor and battery is adopted by sensor Sample;
4. sampled result is saved in corresponding register;
5. sampled result is calculated, then transmitted control signals in corresponding element, to unsteady flow electricity Road and two power inverters are controlled.
The operation principle of the present invention:In active parallel-connection type mixing energy storing system (APHESS), power conversion The task that device A undertakes is:Accurate control APHESS discharge and recharge general powers PwholeSize and direction.Work as light The real-time power output P of photovoltaic generating systemrealLess than power generation command target PrefWhen, power inverter A controls APHESS is with power Pwhole=Pref-PrealRelease energy, compensate the deficiency of photovoltaic power generation system output power; Work as PrealMore than PrefWhen, power inverter A controls APHESS with power Pwhole=Preal-PrefFrom photovoltaic generation Energy is absorbed in system, and is stored.Pass through power inverter A control so that APHESS's gulps down Tell random, accidental fluctuation power the demand that power disclosure satisfy that regulation photovoltaic generating system output in real time. In APHESS, the task that power inverter B undertakes is:Accurate adjustment accumulator cell charging and discharging power Pbat's Size and direction.The charge and discharge process of battery can accurately be controlled by power inverter B, favorably In the service life of extension battery.
During APHESS progress power is handled up, ultracapacitor plays the work of power/energy buffer With.Therefore, power inverter A and power inverter B can realize uneoupled control, and then complete independently is each From control targe.The size of ultracapacitor charge-discharge electric power | Pcap| for energy-storage system discharge and recharge general power and storage Difference between battery charging and discharging power
In Pwhole- timing, is controlled by power inverter B | Pbat|, can realize | Pcap| controllable precise.Lead to Controls of the overpower converter B to accumulator cell charging and discharging power, it is possible to achieve APHESS discharge and recharge total work Flexible allocation of the rate between battery and ultracapacitor.APHESS structure composition is battery and super Capacitor plays respective energy storage advantage, and P is adjusted respectivelywaveIn steady-sxtate wave motion power PsteadyWork(is fluctuated with spike Rate PpeakLay a good foundation.
In addition, G1And G2It is anti-phase middle connection storage capacitor C2.In addition, G1With D1Parallel connected in reverse phase. Same G2With D2Parallel connected in reverse phase.Wherein, L1With L2And C1With C3For steady voltage electric current, filtering electricity The harmonic wave of pressure and electric current.E1It is expressed as connecing the DC side of rectification circuit, E2Expression connects energy storage device.
The input and output sense of current of power current converter (see Fig. 3) can make just or negative.It is special Putting is:Output input current do not pulse, voltage can with again between 0 and ∞ change, switching transistor emitter collection Ground connection.
The present invention is advantageous in that:1. energy-storage battery is organically combined with ultracapacitor, passes through quick, essence True power adjusts the fluctuating power of photovoltaic generating system output in real time;2. by battery and super capacitor Device undertakes the reasonable distribution of power adjusting task, make energy-storage system have high power density, high-energy-density, The characteristic of long circulation life;3. by two power inverters, energy is accurately distributed;4. meter is utilized The data of calculation machine high speed are calculated and data-handling capacity, substantially increase the reliability of the control system.
(4) illustrate:
Fig. 1 is a kind of involved active parallel-connection type mixing energy storing system applied to photovoltaic generating system of the present invention General structure schematic diagram.
Fig. 2 is a kind of involved active parallel-connection type mixing energy storing system applied to photovoltaic generating system of the present invention Electrical block diagram.
Fig. 3 is a kind of involved active parallel-connection type mixing energy storing system applied to photovoltaic generating system of the present invention Middle power inverter A and power inverter B electrical block diagram.
Fig. 4 is a kind of involved active parallel-connection type mixing energy storing system applied to photovoltaic generating system of the present invention Structure and Process schematic diagram.
(5) embodiment:
Embodiment:A kind of active parallel-connection type mixing energy storing system (see Fig. 1) applied to photovoltaic generating system, Including photovoltaic system, it is characterised in that it includes mixed energy storage system, biphase rectification/inverter unit, DSP Controller unit, power inverter A, power inverter B and energy storage grid-connected converter unit;Wherein, The mixed energy storage system includes superconductive energy storage system and energy-storage system of accumulator, the energy storage grid-connected converter The AC of device unit is directly connected to power network, and its DC side is connected with biphase rectification/inverter unit;It is described Biphase rectification/inverter unit is connected with mixed energy storage system unit;The input of the dsp controller unit The output signal of photovoltaic system, power inverter B and mixed energy storage system, its output end point are gathered respectively Not Lian Jie energy storage grid-connected converter unit, power inverter A and power inverter B input.
Biphase rectification/the inverter unit is made up of power inverter A and power inverter B;Wherein institute Power inverter A sides are stated to be connected with the grid-connected rectification adverser unit of energy storage, opposite side respectively with power conversion Device B and super capacitor storage unit connection;The opposite side of the power inverter B and batteries to store energy unit Connection.
Biphase rectification/inverter unit (see Fig. 2) of the energy-storage system is made up of controlled rectification circuit;Institute Controlled rectification circuit is stated by turn-off thyristor or the high-power electric and electronic of insulated gate bipolar IGCT class Device constitutes three phase rectifier bridge-type circuit with diodes in parallel;Its DC side is connected with power inverter A, hands over Stream side is connected with the output end of photovoltaic generating system in power network.
The power inverter A and power inverter B be respectively by electric capacity C1, inductance L1, triode G1, Diode D1, electric capacity C2, diode D2, triode G2, inductance L2 and electric capacity C3 are constituted (see Fig. 3); Wherein, the triode G1 and triode G2 are in anti-phase connection;The electric capacity C2 is connected to triode G1 Colelctor electrode and triode G2 colelctor electrode between;The diode D1 is connected in parallel on triode G1 current collection Between pole and emitter stage;The colelctor electrode of inductance L1 one end connecting triode G1, the other end and energy storage are simultaneously The DC output end E1 connections of net rectification adverser unit;The electric capacity C1 is connected in parallel on inductance L1 and triode G1 two ends;The diode D2 is connected in parallel between triode G2 collector and emitter;The inductance The DC output end E2 connections of L2 one end connecting triode G2 colelctor electrode, the other end and energy-storage units;Institute State electric capacity C3 and be connected in parallel on inductance L2 and triode G2 two ends.
The DSP control unit is control power inverter A and B and the grid-connected rectification adverser list of energy storage The core of member, is made up of TMS320F28335 control chips, drive circuit and sample circuit;It is described to adopt Input collection power network AC three-phase voltage, current signal and the bidirectional power current converter list of sample circuit The input terminal voltage current signal of member;The drive circuit is by receiving TMS320F28335 control chips Drive command controls power electronics in bidirectional power flow power converter cells and the grid-connected rectification adverser unit of energy storage The conducting and shut-off of switching device.
The DSP control unit is powered by power conversion chip TPS767D318 for it.
A kind of method of work (see Fig. 4) of active parallel-connection type mixing energy storing system applied to photovoltaic generating system, It is characterized in that it comprises the following steps:
1. when the power that photovoltaic system is sent is higher than power needed for power network, energy storage grid-connected converter unit starts Work, and in rectification state;
2. the electric energy of spilling is redistributed by power inverter A and power inverter B respectively;
3. the high-frequency energy in electric energy is absorbed by ultracapacitor energy storage unit, and batteries to store energy unit is then inhaled Receive low frequency energy;
4. when dsp controller, which detects the power that photovoltaic generating system sends, is higher by setting value, DSP controls Device control convertor circuit is allowed to be in rectification state, while detection power inverter A, power inverter B Inductance L1, inductance L2 electric current ILA、ILBAnd batteries terminal voltage Ubat, ultracapacitor group end electricity Press Ucap, control two power inverters to be allocated excessive electric energy;Ultracapacitor absorbs high-frequency energy, And battery absorbs low frequency energy.
4. middle dsp controller controls convertor circuit and power inverter specific steps including following several to the step Step:
1. analog-to-digital conversion signal is started;
2. controller is initialized;
3. voltage, electric current to AC and DC side and super capacitor and battery is adopted by sensor Sample;
4. sampled result is saved in corresponding register;
5. sampled result is calculated, then transmitted control signals in corresponding element, to unsteady flow electricity Road and two power inverters are controlled.

Claims (8)

1. a kind of active parallel-connection type mixing energy storing system applied to photovoltaic generating system, including photovoltaic system, It is characterized in that it includes mixed energy storage system, biphase rectification/inverter unit, dsp controller unit, work( Rate converter A, power inverter B and energy storage grid-connected converter unit;Wherein, the hybrid energy-storing system System includes superconductive energy storage system and energy-storage system of accumulator, the AC of the energy storage grid-connected converter unit It is directly connected to power network, its DC side is connected with biphase rectification/inverter unit;Biphase rectification/the inverter Unit is connected with mixed energy storage system unit;The input of the dsp controller unit gathers photovoltaic system respectively The output signal of system, power inverter B and mixed energy storage system, it is grid-connected that its output end connects energy storage respectively The input of converter cell, power inverter A and power inverter B.
2. a kind of active parallel-connection type hybrid energy-storing system applied to photovoltaic generating system according to claim 1 System, it is characterised in that the biphase rectification/inverter unit is by power inverter A and power inverter B structures Into;Wherein described power inverter A sides are connected with the grid-connected rectification adverser unit of energy storage, opposite side difference It is connected with power inverter B and super capacitor storage unit;The opposite side of the power inverter B and electric power storage Pond energy-storage units connection.
3. a kind of active parallel-connection type hybrid energy-storing system applied to photovoltaic generating system according to claim 1 System, it is characterised in that the biphase rectification/inverter unit is made up of controlled rectification circuit;The controlled rectification Circuit by turn-off thyristor or insulated gate bipolar IGCT class device for high-power power electronic and two poles Pipe parallel connection constitutes three phase rectifier bridge-type circuit;Its DC side is connected with power inverter A, AC and power network The output end connection of middle photovoltaic generating system.
4. a kind of active parallel-connection type hybrid energy-storing system applied to photovoltaic generating system according to claim 1 System, it is characterised in that the power inverter A and power inverter B be respectively by electric capacity C1, inductance L1, Triode G1, diode D1, electric capacity C2, diode D2, triode G2, inductance L2 and electric capacity C3 Constitute;Wherein, the triode G1 and triode G2 are in anti-phase connection;The electric capacity C2 is connected to three Between pole pipe G1 colelctor electrode and triode G2 colelctor electrode;The diode D1 is connected in parallel on triode G1 Collector and emitter between;The colelctor electrode of inductance L1 one end connecting triode G1, the other end with The DC output end E1 connections of the grid-connected rectification adverser unit of energy storage;The electric capacity C1 is connected in parallel on inductance L1 With triode G1 two ends;The diode D2 is connected in parallel between triode G2 collector and emitter; The DC output end E2 of the colelctor electrode of inductance L2 one end connecting triode G2, the other end and energy-storage units Connection;The electric capacity C3 is connected in parallel on inductance L2 and triode G2 two ends.
5. a kind of active parallel-connection type hybrid energy-storing system applied to photovoltaic generating system according to claim 1 System, it is characterised in that the DSP control unit be control power inverter A and power inverter B and The core of the grid-connected rectification adverser unit of energy storage, be by TMS320F28335 control chips, drive circuit and Sample circuit is constituted;The input collection power network AC three-phase voltage of the sample circuit, current signal with And the input terminal voltage current signal of bidirectional power flow power converter cells;The drive circuit is by receiving The drive command control bidirectional power flow power converter cells of TMS320F28335 control chips and energy storage are grid-connected The conducting and shut-off of electronic power switch device in rectification adverser unit.
6. a kind of active parallel-connection type hybrid energy-storing system applied to photovoltaic generating system according to claim 1 System, it is characterised in that the DSP control unit is powered by power conversion chip TPS767D318 for it.
7. a kind of method of work of active parallel-connection type mixing energy storing system applied to photovoltaic generating system, it is special Levy and be that it comprises the following steps:
1. when the power that photovoltaic system is sent is higher than power needed for power network, energy storage grid-connected converter unit starts Work, and in rectification state;
2. the electric energy of spilling is redistributed by power inverter A and power inverter B respectively;
3. the high-frequency energy in electric energy is absorbed by ultracapacitor energy storage unit, and batteries to store energy unit is then inhaled Receive low frequency energy;
4. when dsp controller, which detects the power that photovoltaic generating system sends, is higher by setting value, DSP controls Device control convertor circuit is allowed to be in rectification state, while detection power inverter A, power inverter B Inductance L1, inductance L2 electric current ILA、ILBAnd batteries terminal voltage Ubat, ultracapacitor group end electricity Press Ucap, control two power inverters to be allocated excessive electric energy;Ultracapacitor absorbs high-frequency energy, And battery absorbs low frequency energy.
8. a kind of active parallel-connection type hybrid energy-storing system applied to photovoltaic generating system according to claim 7 The method of work of system, it is characterised in that 4. middle dsp controller controls convertor circuit and power conversion to the step Implement body step includes the following steps:
1. analog-to-digital conversion signal is started;
2. controller is initialized;
3. voltage, electric current to AC and DC side and super capacitor and battery is adopted by sensor Sample;
4. sampled result is saved in corresponding register;
5. sampled result is calculated, then transmitted control signals in corresponding element, to unsteady flow electricity Road and two power inverters are controlled.
CN201610070869.2A 2016-02-02 2016-02-02 A kind of active parallel-connection type mixing energy storing system applied to photovoltaic generating system Pending CN107026463A (en)

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