CN105870953B - A kind of light storage joint grid-connected system and its control method - Google Patents

A kind of light storage joint grid-connected system and its control method Download PDF

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Publication number
CN105870953B
CN105870953B CN201610202607.7A CN201610202607A CN105870953B CN 105870953 B CN105870953 B CN 105870953B CN 201610202607 A CN201610202607 A CN 201610202607A CN 105870953 B CN105870953 B CN 105870953B
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current
voltage
module
energy
inverter
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CN105870953A (en
Inventor
郑玉平
王伟
韦徵
茹心芹
王彤
宋飞
姬秋华
马崇
于建成
卢欣
王越超
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DTYPV CO., LTD.
Nanjing Nanrui Solar Energy Technology Co., Ltd.
State Grid Corp of China SGCC
State Grid Tianjin Electric Power Co Ltd
Nari Technology Co Ltd
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Dtypv Co Ltd
NANJING NANRUI SOLAR ENERGY TECHNOLOGY Co Ltd
State Grid Corp of China SGCC
State Grid Tianjin Electric Power Co Ltd
Nari Technology Co Ltd
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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
    • Y02E70/00Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30Systems combining energy storage with energy generation of non-fossil origin

Abstract

The invention discloses a kind of light to store up joint grid-connected system, including sequentially connected photovoltaic array, three-phase inverter main circuit, filter circuit, power grid, two-way DC/DC converters, acquisition module, MPPT computing modules, DC voltage/alternating current double -loop control module, bridge arm voltage modulating wave generation module, battery current, battery voltage acquisition module, cell DC current computing module, battery current closed loop control module, DC/DC converter modulating wave generation modules.Control method based on the system can make light storage joint grid-connected system participate in power grid frequency modulation process as conventional electric power generation unit, when mains frequency occurs abnormal, two-way DC/DC converters participate in frequency modulation, to power grid conveying or absorbed power, adverse effect of the simple photovoltaic generating system to power grid is reduced, drastically increases the grid-connected adaptability of new energy grid connection system.

Description

A kind of light storage joint grid-connected system and its control method
Technical field
The present invention relates to a kind of light storage joint grid-connected system and its control method, it can be achieved that light storage association system is operated in simultaneously Under net operating mode, synchronous generator primary frequency function is simulated.
Background technology
In recent years, with the continuous development of new energy power generation technology, the distributed generation resource based on power electronics interface is in electricity The permeability of Force system is constantly promoted.In the control strategy of conventional photovoltaic gird-connected inverter, when photovoltaic DC-to-AC converter works normally The maximum power always obtained according to maximum power algorithm (MPPT) to power grid conveying from solar panel, works as mains frequency When disturbing, due to the limitation that solar panel is contributed, conventional photovoltaic inverter cannot respond to the variation of mains frequency, join With the primary frequency modulation of power grid.
Secondly, photovoltaic generating system lacks inertia, does not possess short-time overload capacity, and at the same time tradition centralization once can Source gradually decreases, this causes the rotary inertia of power grid to be gradually reduced, and frequency fluctuation becomes larger, the confession especially based on photovoltaic generation Electric system, the intermittence and non-scheduling of the energy more exacerbate the frequency fluctuation of power grid so that the frequency stability of system is asked Topic is increasingly severe, and short-time rating even off line cannot be provided under grid fault conditions, electric system is caused to be difficult to obtain foot The enough time causes grid stability drastically to decline to recover power grid.
Therefore, set up using energy storage device and conventional photovoltaic inverter into light and store up joint grid-connected system, and by using conjunction Suitable control program realizes that light storage joint grid-connected system participates in power grid frequency modulation process as conventional electric power generation unit, it is possible to reduce Simple photovoltaic generating system can be effectively power grid when being particularly power grid occurrence frequency anomalous event to the adverse effect of power grid Necessary active support and inertia damping are provided, the grid-connected adaptability of new energy grid connection system will be greatly improved.
The content of the invention
The technical problems to be solved by the invention are the defects of overcoming the prior art, provide a kind of light storage joint grid-connected system And its control method, it can be achieved that light storage association system be operated under grid-connected operating mode, simulate synchronous generator primary frequency function, when When mains frequency changes, the light storage joint grid-connected system invented conveys to power grid in real time or absorbs active power, to electricity Net provides active power support to participate in primary frequency regulation of power network, and the grid-connected adaptability to improve new-energy grid-connected device provides important Technical foundation.
In order to solve the above technical problems, the present invention is as follows using technical solution:
A kind of light stores up joint grid-connected system, including photovoltaic array, three-phase inverter main circuit, filter circuit, power grid, energy storage Battery and two-way DC/DC converters, the photovoltaic array, three-phase inverter main circuit, filter circuit, power grid are sequentially connected, institute It states two-way DC/DC converters to be connected between energy-storage battery and three-phase inverter main circuit, which is characterized in that further include:
DC current acquisition module, for gathering the electric current of photovoltaic array output;
DC voltage acquisition module, for gathering the input voltage of three-phase inverter main circuit;
AC current collecting module, for gathering the inductive current of three-phase inverter main circuit output;
AC voltage sampling module, for gathering the contravarianter voltage of three-phase inverter main circuit output;
MPPT computing modules, the electricity that the electric current exported according to DC current acquisition module, DC voltage acquisition module export Pressure calculates inverter direct-current voltage reference value;
DC voltage/alternating current double -loop control module, the inductive current collected according to AC current collecting module are handed over The contravarianter voltage that collects of stream voltage acquisition module and inverter direct-current voltage reference value, calculate alternating current reference signal and Inverter three-phase modulations signal;
Bridge arm voltage modulating wave generation module generates inverter power according to inverter three-phase modulations signal and carrier signal Pipe control signal;
Battery current acquisition module, for gathering the battery current of energy-storage battery output;
Battery voltage acquisition module, for gathering the cell voltage of energy-storage battery output;
Cell DC current computing module, the battery current exported according to battery current acquisition module, battery voltage acquisition The contravarianter voltage and energy-storage battery SOC signals that the cell voltage of module output, AC voltage sampling module collect calculate storage It can battery DC set-point;
Battery current closed loop control module calculates two-way DC/DC converters modulation letter according to energy-storage battery direct current set-point Number;
DC/DC converter modulating wave generation modules are converted according to two-way DC/DC converters modulated signal and two-way DC/DC Device carrier signal generates two-way DC/DC inverter powers pipe control signal.
Control method based on foregoing light storage joint grid-connected system, which is characterized in that comprise the following steps:
A when mains frequency is normal, using three-phase converter strategy, is as follows:
A1, the electric current that DC current acquisition module is exported, the voltage of DC voltage acquisition module output, is sent into MPPT meters Module is calculated, calculates inverter direct-current voltage reference value Udcref
A2, the inductive current i that AC current collecting module is collectedABC, the inversion that collects of AC voltage sampling module Device voltage uoABCWith inverter direct-current voltage reference value Udcref, it is sent into DC voltage/alternating current double -loop control module, direct current Output inverter three-phase modulations signal v after pressure/alternating current double -loop control module calculatesmABC
A3, by inverter three-phase modulations signal vmABCWith carrier signal vc, bridge arm voltage modulating wave generation module is sent into, it is raw Into inverter power pipe control signal d1
B, when mains frequency occurs abnormal, two-way DC/DC converters participate in primary frequency modulation, when actual electric network frequency is less than electricity Net rated frequency fn, and energy-storage battery state-of-charge soc > socminWhen, wherein socminIt is minimum for the charged coefficient of energy-storage battery Value, two-way DC/DC converters are according to energy-storage battery direct current set-point IdcrefClosed-loop control is carried out, active power branch is provided to power grid Support;When actual electric network frequency is higher than power grid rated frequency fnWhen, if energy-storage battery state-of-charge soc < soc at this timemax, wherein socmaxFor the charged coefficient maximum of energy-storage battery, three-phase inverter remains operating in MPPT maximal power tracing patterns, two-way DC/DC converters will absorb the active power of photovoltaic array output, and having for power grid is transported to limit light storage joint grid-connected system Work(power;If energy-storage battery state-of-charge soc=soc at this timemax, limit power measure is directly taken three-phase inverter, makes its fortune Row is as follows in limit power mode:
B1, the battery current that battery current acquisition module is exported, the cell voltage of battery voltage acquisition module output, friendship The contravarianter voltage u that stream voltage acquisition module collectsoABCWith energy-storage battery SOC signals, it is sent into cell DC current and calculates mould Block calculates energy-storage battery direct current set-point Idcref
B2, by energy-storage battery direct current set-point Idcref, battery current closed loop control module is sent into, two-way DC/DC is calculated and becomes Parallel operation modulated signal vmdc
B3, by two-way DC/DC converters modulated signal vmdcWith two-way DC/DC converters carrier signal vcdc, it is sent into DC/DC Converter modulating wave generation module generates two-way DC/DC inverter powers pipe control signal d2
The control method of foregoing light storage joint grid-connected system, it is characterised in that:Cell DC current in the step B1 Computing module calculates energy-storage battery direct current set-point IdcrefWhen, it is calculated by equation below:
Wherein, k=fn-fgmin, fgTo utilize measured contravarianter voltage uoABCThe actual electric network frequency obtained, fgmin To set mains frequency lower limit, fnFor power grid rated frequency,For mains frequency change rate, PmaxFor two-way DC/DC converters Maximum Power Output, VdcFor energy-storage battery voltage, J is virtual rotation inertia.
The control method of foregoing light storage joint grid-connected system, it is characterised in that:Alternating current is adopted in the step A2 The inductive current i that collection module collectsABC, the contravarianter voltage u that collects of AC voltage sampling moduleoABCWith inverter direct current Voltage reference value Udcref, DC voltage/alternating current double -loop control module is sent into, calculates inverter three-phase modulations signal vmABC, It is calculated by equation below:
Wherein, IdrefFor alternating current d shaft current reference signals, kpFor electric current loop adjuster proportionality coefficient, kiElectric current loop tune Save device integral coefficient, UdcFor inverter dc bus feedback voltage, irefABCFor alternating current reference signal.
The present invention has following advantageous effect:
The light storage joint grid-connected system and its control method of the present invention, can make light store up joint grid-connected system as conventional electric power generation Unit equally participates in power grid frequency modulation process, and when mains frequency is normal, using three-phase converter strategy, two-way DC/DC becomes Parallel operation is not involved in frequency modulation, and when mains frequency occurs abnormal, two-way DC/DC converters participate in frequency modulation, is conveyed to power grid or absorbs work( Rate reduces adverse effect of the simple photovoltaic generating system to power grid, drastically increases the grid-connected suitable of new energy grid connection system Ying Xing.
Description of the drawings
Fig. 1 is the overall structure block diagram of the present invention.
Fig. 2 is network voltage frequency discontinuity simulation waveform.
Fig. 3 is in network voltage frequency discontinuity, and two-way DC/DC converters participate in inverter three-phase current during primary frequency modulation Simulation waveform.
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.
A kind of light stores up joint grid-connected system, as shown in Figure 1, including photovoltaic array, three-phase inverter main circuit, filtered electrical Road, power grid, energy-storage battery and two-way DC/DC converters, photovoltaic array, three-phase inverter main circuit, filter circuit, power grid are successively It is connected, the two-way DC/DC converters are connected between energy-storage battery and three-phase inverter main circuit, are further included:DC current Acquisition module 2, DC voltage acquisition module 3, AC current collecting module 4, AC voltage sampling module 5, MPPT computing modules 6th, DC voltage/alternating current double -loop control module 7, bridge arm voltage modulating wave generation module 8, battery current acquisition module 9, electricity Cell voltage acquisition module 10, cell DC current computing module 11, battery current closed loop control module 12, DC/DC converter tune Ripple generation module 13 processed.
DC current acquisition module 2, for gathering the electric current of photovoltaic array output;
DC voltage acquisition module 3, for gathering the input voltage of three-phase inverter main circuit;
AC current collecting module 4, for gathering the inductive current of three-phase inverter main circuit output;
AC voltage sampling module 5, for gathering the contravarianter voltage of three-phase inverter main circuit output;
MPPT computing modules 6, the electric current exported according to DC current acquisition module 2, DC voltage acquisition module 3 export Voltage calculates inverter direct-current voltage reference value;
DC voltage/alternating current double -loop control module 7, the inductive current collected according to AC current collecting module 4, The contravarianter voltage and inverter direct-current voltage reference value that AC voltage sampling module 5 collects calculate alternating current electric current ginseng Examine signal and inverter three-phase modulations signal;
Bridge arm voltage modulating wave generation module 8 generates inverter work(according to inverter three-phase modulations signal and carrier signal Rate pipe control signal;
Battery current acquisition module 9, for gathering the battery current of energy-storage battery output;
Battery voltage acquisition module 10, for gathering the cell voltage of energy-storage battery output;
Cell DC current computing module 11, the battery current exported according to battery current acquisition module 9, cell voltage are adopted The contravarianter voltage and energy-storage battery SOC signal meters that the cell voltage of the collection output of module 10, AC voltage sampling module 5 collect Calculate energy-storage battery direct current set-point;
Battery current closed loop control module 12 calculates two-way DC/DC converters according to energy-storage battery direct current set-point and modulates Signal;
DC/DC converter modulating waves generation module 13 becomes according to two-way DC/DC converters modulated signal and two-way DC/DC Parallel operation carrier signal generates two-way DC/DC inverter powers pipe control signal.
Based on the control method of above-mentioned light storage joint grid-connected system, comprise the following steps:
A when mains frequency is normal, using three-phase converter strategy, is as follows:
A1, the voltage that the electric current that DC current acquisition module 2 is exported, DC voltage acquisition module 3 export are sent into MPPT Computing module 6 calculates inverter direct-current voltage reference value Udcref
A2, the inductive current i that AC current collecting module 4 is collectedABC, AC voltage sampling module 5 collect it is inverse Become device voltage uoABCWith inverter direct-current voltage reference value Udcref, it is sent into DC voltage/alternating current double -loop control module 7 and calculates Output inverter three-phase modulations signal v afterwardsmABC
A3, by inverter three-phase modulations signal vmABCWith carrier signal vc, bridge arm voltage modulating wave generation module 8 is sent into, it is raw Into inverter power pipe control signal d1
B, when mains frequency occurs abnormal, two-way DC/DC converters participate in primary frequency modulation, when actual electric network frequency is less than electricity Net rated frequency fn, and energy-storage battery state-of-charge soc > socminWhen, wherein socminIt is minimum for the charged coefficient of energy-storage battery Value, two-way DC/DC converters are according to energy-storage battery direct current set-point IdcrefClosed-loop control is carried out, active power branch is provided to power grid Support;When actual electric network frequency is higher than power grid rated frequency fnWhen, if energy-storage battery state-of-charge soc < soc at this timemax, wherein socmaxFor the charged coefficient maximum of energy-storage battery, three-phase inverter remains operating in MPPT maximal power tracing patterns, two-way DC/DC converters will absorb the active power of photovoltaic array output, and having for power grid is transported to limit light storage joint grid-connected system Work(power;If energy-storage battery state-of-charge soc=soc at this timemax, limit power measure is directly taken three-phase inverter, makes its fortune It goes in limit power mode,
It is as follows:
B1, the battery electricity that the battery current that battery current acquisition module 9 is exported, battery voltage acquisition module 10 export The contravarianter voltage u that pressure, AC voltage sampling module 5 collectoABCWith energy-storage battery SOC signals, cell DC current is sent into Computing module 11 calculates energy-storage battery direct current set-point Idcref
B2, by energy-storage battery direct current set-point Idcref, battery current closed loop control module 12 is sent into, calculates two-way DC/DC Converter modulated signal vmdc
B3, by two-way DC/DC converters modulated signal vmdcWith two-way DC/DC converters carrier signal vcdc, it is sent into DC/DC Converter modulating wave generation module 13 generates two-way DC/DC inverter powers pipe control signal d2
In step B1, cell DC current computing module 11 calculates energy-storage battery direct current set-point IdcrefWhen, by as follows Formula calculates:
Wherein, k=fn-fgmin, fgTo utilize measured contravarianter voltage uoABCThe actual electric network frequency obtained, fgmin To set mains frequency lower limit, fnFor power grid rated frequency,For mains frequency change rate, PmaxFor two-way DC/DC converters Maximum Power Output, VdcFor energy-storage battery voltage, J is virtual rotation inertia.
In step A2, inductive current i that AC current collecting module 4 is collectedABC, AC voltage sampling module 5 gathers The contravarianter voltage u arrivedoABCWith inverter direct-current voltage reference value Udcref, it is sent into DC voltage/alternating current double -loop control mould Block 7 calculates inverter three-phase modulations signal vmABC, calculated by equation below:
Wherein, IdrefFor alternating current d shaft current reference signals, kpFor electric current loop adjuster proportionality coefficient, kiElectric current loop tune Save device integral coefficient, UdcFor inverter dc bus feedback voltage, irefABCFor alternating current reference signal.
Correctness and feasibility to illustrate the invention, to a kind of light storage joint grid-connected system and its controlling party proposed Method has carried out simulating, verifying, and wherein simulation parameter is:Photovoltaic array open-circuit voltage 761.6V, short circuit current flow 912.8A, illumination are strong It spends for 1000, maximum power point voltage 610V during 25 degree of temperature, current transformer output inductor L is 0.15mH, output filtering Capacitance C is 200 μ F (triangular form connection), two-way DC/DC converters energy-storage battery voltage 500V.
(1) Fig. 2 is network voltage frequency discontinuity simulation waveform:In figure, during 2s, network voltage frequency by 50Hz be mutated to 49.5Hz;
(2) Fig. 3 is in network voltage frequency discontinuity, and two-way DC/DC converters participate in inverter three-phase during primary frequency modulation Current simulations waveform, inverter output current increases after when 2s, two-way DC/DC converters participated in primary frequency modulation;
The simulation waveform that Fig. 2 Fig. 3 is provided is shown, for mains frequency fluctuation, two-way DC/DC converters can participate in once Frequency modulation exports certain active power support mains frequency.
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 (3)

1. a kind of light stores up joint grid-connected system, including photovoltaic array, three-phase inverter main circuit, filter circuit, power grid, energy storage electricity Pond and two-way DC/DC converters, the photovoltaic array, three-phase inverter main circuit, filter circuit, power grid are sequentially connected, described Two-way DC/DC converters are connected between energy-storage battery and three-phase inverter main circuit, which is characterized in that are further included:
DC current acquisition module (2), for gathering the electric current of photovoltaic array output;
DC voltage acquisition module (3), for gathering the input voltage of three-phase inverter main circuit;
AC current collecting module (4), for gathering the inductive current of three-phase inverter main circuit output;
AC voltage sampling module (5), for gathering the contravarianter voltage of three-phase inverter main circuit output;
MPPT computing modules (6), the electric current exported according to DC current acquisition module (2), DC voltage acquisition module (3) export Voltage, calculate inverter direct-current voltage reference value;
DC voltage/alternating current double -loop control module (7), the inductive current collected according to AC current collecting module (4), The contravarianter voltage and inverter direct-current voltage reference value that AC voltage sampling module (5) collects calculate alternating current reference Signal and inverter three-phase modulations signal;
Bridge arm voltage modulating wave generation module (8) generates inverter power according to inverter three-phase modulations signal and carrier signal Pipe control signal;
Battery current acquisition module (9), for gathering the battery current of energy-storage battery output;
Battery voltage acquisition module (10), for gathering the cell voltage of energy-storage battery output;
Cell DC current computing module (11), the battery current exported according to battery current acquisition module (9), cell voltage are adopted The contravarianter voltage and energy-storage battery SOC letters that the cell voltage of collection module (10) output, AC voltage sampling module (5) collect Number calculate energy-storage battery direct current set-point;
Battery current closed loop control module (12) calculates two-way DC/DC converters modulation letter according to energy-storage battery direct current set-point Number;
DC/DC converter modulating wave generation modules (13) are converted according to two-way DC/DC converters modulated signal and two-way DC/DC Device carrier signal generates two-way DC/DC inverter powers pipe control signal;
The control method of the light storage joint grid-connected system, comprises the following steps:
A when mains frequency is normal, using three-phase converter strategy, is as follows:
A1 by the electric current of DC current acquisition module (2) output, the voltage of DC voltage acquisition module (3) output, is sent into MPPT Computing module (6) calculates inverter direct-current voltage reference value Udcref
A2, the inductive current i that AC current collecting module (4) is collectedABC, AC voltage sampling module (5) collect it is inverse Become device voltage uoABCWith inverter direct-current voltage reference value Udcref, DC voltage/alternating current double -loop control module (7) is sent into, Output inverter three-phase modulations signal v after DC voltage/alternating current double -loop control module (7) calculatesmABC
A3, by inverter three-phase modulations signal vmABCWith carrier signal vc, it is sent into bridge arm voltage modulating wave generation module (8), generation Inverter power pipe control signal d1
B, when mains frequency occurs abnormal, two-way DC/DC converters participate in primary frequency modulation, when actual electric network frequency is less than power grid volume Determine frequency fn, and energy-storage battery state-of-charge soc>socminWhen, wherein socminIt is two-way for the charged coefficient minimum value of energy-storage battery DC/DC converters are according to energy-storage battery direct current set-point IdcrefClosed-loop control is carried out, active power support is provided to power grid;Work as reality Border mains frequency is higher than power grid rated frequency fnWhen, if energy-storage battery state-of-charge soc at this time<socmax, wherein socmaxFor storage Energy battery charge coefficient maximum, three-phase inverter remain operating in MPPT maximal power tracing patterns, two-way DC/DC converters The active power of photovoltaic array output will be absorbed, to limit the active power that light storage joint grid-connected system is transported to power grid;If this When energy-storage battery state-of-charge soc=socmax, limit power measure is directly taken three-phase inverter, it is made to run on limit power Pattern is as follows:
B1, by the battery current of battery current acquisition module (9) output, the battery electricity of battery voltage acquisition module (10) output The contravarianter voltage u that pressure, AC voltage sampling module (5) collectoABCWith energy-storage battery SOC signals, battery DC electricity is sent into Stream calculation module (11) calculates energy-storage battery direct current set-point Idcref
B2, by energy-storage battery direct current set-point Idcref, battery current closed loop control module (12) is sent into, two-way DC/DC is calculated and becomes Parallel operation modulated signal vmdc
B3, by two-way DC/DC converters modulated signal vmdcWith two-way DC/DC converters carrier signal vcdc, it is sent into DC/DC conversion Device modulating wave generation module (13) generates two-way DC/DC inverter powers pipe control signal d2
2. the control method of light storage joint grid-connected system according to claim 1, it is characterised in that:It is electric in the step B1 Pond DC current calculates module (11) and calculates energy-storage battery direct current set-point IdcrefWhen, it is calculated by equation below:
Wherein, k=fn-fgmin, fgTo utilize measured contravarianter voltage uoABCThe actual electric network frequency obtained, fgminTo set Determine mains frequency lower limit, fnFor power grid rated frequency,For mains frequency change rate, PmaxIt is exported for two-way DC/DC converters Maximum power, VdcFor energy-storage battery voltage, J is virtual rotation inertia.
3. the control method of light storage joint grid-connected system according to claim 1, it is characterised in that:It will in the step A2 The inductive current i that AC current collecting module (4) collectsABC, the contravarianter voltage that collects of AC voltage sampling module (5) uoABCWith inverter direct-current voltage reference value Udcref, DC voltage/alternating current double -loop control module (7) is sent into, calculates inversion Device three-phase modulations signal vmABC, calculated by equation below:
Wherein, IdrefFor alternating current d shaft current reference signals, kpFor electric current loop adjuster proportionality coefficient, kiElectric current loop adjuster Integral coefficient, UdcFor inverter dc bus feedback voltage, irefABCFor alternating current reference signal.
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