CN108777497A - A kind of stage type photovoltaic generation is actively engaged in mains frequency adjusting control strategy - Google Patents

A kind of stage type photovoltaic generation is actively engaged in mains frequency adjusting control strategy Download PDF

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Publication number
CN108777497A
CN108777497A CN201810838580.XA CN201810838580A CN108777497A CN 108777497 A CN108777497 A CN 108777497A CN 201810838580 A CN201810838580 A CN 201810838580A CN 108777497 A CN108777497 A CN 108777497A
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voltage
axis
pressure side
current
controllers
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CN201810838580.XA
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CN108777497B (en
Inventor
贾祺
项丽
丁茂生
杨慧彪
严干贵
杨博闻
顾雨嘉
张爽
田蓓
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National Network Ningxia Electric Power Co Ltd
Northeast Electric Power University
Electric Power Research Institute of State Grid Ningxia Electric Power Co Ltd
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National Network Ningxia Electric Power Co Ltd
Northeast Dianli University
Electric Power Research Institute of State Grid Ningxia Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/383—
    • 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

Abstract

A kind of stage type photovoltaic generation is actively engaged in mains frequency adjusting control strategy, its main feature is that, including：Stage type photovoltaic generating system mesolow side, high-pressure side DC voltage, grid-connected current, grid entry point voltage are measured, handles to obtain d axis watt current and active voltage, q axis reactive current and reactive voltage by Park Transformation；The voltage difference of low-pressure side DC voltage and reference value is input in controller, duty ratio d driving Boost work is calculated；The voltage difference of high-pressure side DC voltage and reference value is input in controller, d axis watt current reference instructions is calculated, idle difference is input in controller, calculates q axis reactive current reference instructions；By d axis watt current, reactive current and watt current reference instruction, q axis is idle, and poor input controller is made in reference current instruction, calculates d axis inverter output voltages, q axis inverter output voltages, and then drives inverter work, the variation of response system frequency.

Description

A kind of stage type photovoltaic generation is actively engaged in mains frequency adjusting control strategy
Technical field
It networks generator operation control field the present invention relates to photovoltaic, is that a kind of stage type photovoltaic generation is actively engaged in power grid frequency Rate adjusting control strategy.
Background technology
With the outburst of energy crisis and being on the rise for environmental problem, developing and using regenerative resource becomes countries in the world The key topics of energy strategy transition.Regenerative resource just gradually becomes newly-increased electric power important sources, electric network composition and operation mould Great change will all occur for formula.
The renewable energy power generations such as wind-powered electricity generation, photovoltaic be it is grid-connected via electronic power convertor, usually by maximum power point with When track mode is run, it is generally not involved in mains frequency adjusting.With the continuous expansion of renewable energy source power scale, power grid Anti- power disturbance ability declines, and by the frequency characteristic for the electric system that runs down, threatens power network safety operation.
Invention content
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a kind of scientific and reasonable, applicability By force, the good stage type photovoltaic generation of effect is actively engaged in mains frequency adjusting control strategy, spare certain active in photovoltaic generation Response system frequency changes on the basis of power.
Solve its technical problem the technical solution adopted is that, a kind of stage type photovoltaic generation is actively engaged in mains frequency adjusting Control strategy, characterized in that it includes the following steps：
(1) stage type photovoltaic generating system mesolow side DC voltage U is measuredPV, give a low-pressure side DC voltage ginseng Examine value UPVref, by low-pressure side DC voltage UPVWith low-pressure side direct voltage reference value UPVrefVoltage difference be input to PI controls In device, the duty ratio d of a Boost is calculated by the time-domain expression of PI controllers, duty ratio d is sent to PWM Link generates driving pulse, driving Boost work, and the time-domain expression of PI controllers is：
D=Kp(UPV-UPVref)+Ki∫(UPV-UPVref)dt
In formula, KPFor proportionality coefficient, KiFor integral coefficient；
(2) stage type photovoltaic generating system mesohigh side DC voltage U is measureddc, measure grid-connected electric current ia、ib、ic, Grid entry point voltage uta、utb、utc, handle to obtain the watt current i of d axis components by Park Transformationd, q axis components reactive current iq, d axis components active voltage Utd, q axis components reactive voltage Utq；
(3) a high-pressure side direct voltage reference value U is givendcref, by high-pressure side DC voltage UdcWith high-pressure side direct current Press reference value UdcrefVoltage difference be input in PI controllers, calculate a d axis by the time-domain expression of PI controllers Watt current reference instruction idref, by reactive power Q and reactive power reference qref QrefIdle difference be input to PI controllers In, calculate a q axis reactive current reference instructions i by the time-domain expression of PI controllersqref, the time domain table of PI controllers It is up to formula：idref=Kp(Udc-Udcref)+Ki∫(Udc-Udcref)dt,iqref=Kp(Q-Qref)+Ki∫(Q-Qref)dt；
(4) on the basis of step (3), f-U in being introduced intodcLinear compensation link, to correct d axis watt current reference instructions idref1
In formula, HPVFor the virtual inertia constant of voltage source converter, Udc0For high-pressure side DC voltage initial value, f0For electricity Net original frequency；
(5) the watt current i of d axis components will be obtained in step (2)d, d axis components reactive current iqRespectively with step (4) In d axis watt current reference instructions idref1, the idle reference current of q axis instructs i in step (3)qrefIt is poor to make, and difference is inputted PI controllers calculate d axis net side inverter output voltages U by the time-domain expression of PI controllersd, q axis net side inverters Output voltage Uq, the time-domain expression of PI controllers is：Ud=Kp(idref1-id)+Ki∫(idref1-id) dt, Uq=Kp(iqref-iq) +Ki∫(iqref-iq)dt；
(6) by d axis net side inverter output voltages Ud, q axis net side inverter output voltages UqIt send to PWM links to generate and drive Moving pulse, driving net side inverter work；
(7) when mains frequency, which exists, to be disturbed, the high-pressure side DC voltage in stage type photovoltaic generation perceives power grid first Frequency fluctuation, due to high-pressure side DC voltage UdcWith low-pressure side DC voltage UPVMeet UPV=d × UdcRelationship, mains frequency Disturbance can be transferred to low-pressure side DC voltage UPV, then straight to adjust low-pressure side by adjusting the control bandwidth of Boost Galvanic electricity presses UPVDynamic response, and then adjust photovoltaic generation output power, it made to be actively engaged in mains frequency adjusting.
A kind of stage type photovoltaic generation of the present invention is actively engaged in mains frequency adjusting control strategy, is in net side inverter Middle introducing f-UdcCompensation tache is based on active power deposit, to correct DC voltage control circuit, and then responsive electricity grid frequency Fluctuation may be implemented to provide the ancillary services such as the frequency modulation of similar conventional rack when system frequency declines, maintain system frequency steady It is qualitative.With scientific and reasonable, the advantages that strong applicability, effect is good.
Description of the drawings
Fig. 1 is the topology diagram of stage type photovoltaic generation；
Fig. 2 is stage type photovoltaic generation low-pressure side DC voltage control strategy block diagram；
Fig. 3 is that a kind of stage type photovoltaic generation of the present invention is actively engaged in mains frequency adjusting control strategy block diagram；
Fig. 4 is twoth areas, the four machine simulation example system schematic built；
Fig. 5 is the waveform signal of mains frequency, photovoltaic array output power and single Synchronous generator output power Figure；
Fig. 6 is the waveform diagram of the low-pressure side DC voltage and high-pressure side DC voltage of stage type photovoltaic generation.
Specific implementation mode
Mains frequency is actively engaged in below with drawings and examples to a kind of centralized photovoltaic generation of the present invention to adjust Control strategy is described in detail.
- Fig. 4 referring to Fig.1, Fig. 1 are the topology diagrams of stage type photovoltaic generation；Fig. 2 is stage type photovoltaic generation low pressure Side DC voltage control strategy block diagram；Fig. 3 is that a kind of stage type photovoltaic generation of the present invention is actively engaged in mains frequency adjusting control The tactful block diagram of system；Fig. 4 is twoth areas, the four machine simulation example system schematic built；By three Synchronous generators, a photovoltaic Power station is constituted.
A kind of stage type photovoltaic generation of the present invention is actively engaged in mains frequency adjusting control strategy, includes the following steps：
(1) stage type photovoltaic generating system mesolow side DC voltage U is measuredPV, give a low-pressure side DC voltage ginseng Examine value UPVref, by low-pressure side DC voltage UPVWith low-pressure side direct voltage reference value UPVrefVoltage difference be input to PI controls In device, the duty ratio d of a Boost is calculated by the time-domain expression of PI controllers, duty ratio d is sent to PWM Link generates driving pulse, driving Boost work, and the time-domain expression of PI controllers is：
D=Kp(UPV-UPVref)+Ki∫(UPV-UPVref)dt
In formula, KPFor proportionality coefficient, KiFor integral coefficient；
(2) stage type photovoltaic generating system mesohigh side DC voltage U is measureddc, measure grid-connected electric current ia、ib、ic, Grid entry point voltage uta、utb、utc, handle to obtain the watt current i of d axis components by Park Transformationd, q axis components reactive current iq, d axis components active voltage Utd, q axis components reactive voltage Utq；
(3) a high-pressure side direct voltage reference value U is givendcref, by high-pressure side DC voltage UdcWith high-pressure side direct current Press reference value UdcrefVoltage difference be input in PI controllers, calculate a d axis by the time-domain expression of PI controllers Watt current reference instruction idref, by reactive power Q and reactive power reference qref QrefIdle difference be input to PI controllers In, calculate a q axis reactive current reference instructions i by the time-domain expression of PI controllersqref, the time domain table of PI controllers It is up to formula：idref=Kp(Udc-Udcref)+Ki∫(Udc-Udcref)dt,iqref=Kp(Q-Qref)+Ki∫(Q-Qref)dt；
(4) on the basis of step (3), f-U in being introduced intodcLinear compensation link, to correct d axis watt current reference instructions idref1
In formula, HPVFor the virtual inertia constant of voltage source converter, Udc0For high-pressure side DC voltage initial value, f0For electricity Net original frequency；
(5) the watt current i of d axis components will be obtained in step (2)d, d axis components reactive current iqRespectively with step (4) In d axis watt current reference instructions idref1, the idle reference current of q axis instructs i in step (3)qrefIt is poor to make, and difference is inputted PI controllers calculate d axis net side inverter output voltages U by the time-domain expression of PI controllersd, q axis net side inverters Output voltage Uq, the time-domain expression of PI controllers is：Ud=Kp(idref1-id)+Ki∫(idref1-id) dt, Uq=Kp(iqref-iq) +Ki∫(iqref-iq)dt；
(6) by d axis net side inverter output voltages Ud, q axis net side inverter output voltages UqIt send to PWM links to generate and drive Moving pulse, driving net side inverter work；
(7) when mains frequency, which exists, to be disturbed, the high-pressure side DC voltage in stage type photovoltaic generation perceives power grid first Frequency fluctuation, due to high-pressure side DC voltage UdcWith low-pressure side DC voltage UPVMeet UPV=d × UdcRelationship, mains frequency Disturbance can be transferred to low-pressure side DC voltage UPV, then straight to adjust low-pressure side by adjusting the control bandwidth of Boost Galvanic electricity presses UPVDynamic response, and then adjust photovoltaic generation output power, it made to be actively engaged in mains frequency adjusting.
With reference to Fig. 5, when system loading is uprushed, in the case of the control bandwidth of different Boosts, mains frequency, photovoltaic The waveform diagram of array output power and single Synchronous generator output power can be seen that when load disturbs Stage type formula photovoltaic generation can be actively engaged in mains frequency adjusting, inhibit that mains frequency is minimum falls, and it is inclined to improve steady frequency Difference.
With reference to Fig. 6, when system loading is uprushed, in the case of the control bandwidth of different Boosts, stage type photovoltaic generation The waveform diagram of low-pressure side DC voltage and high-pressure side DC voltage can be seen that stage type photovoltaic using the present invention and send out After electricity is actively engaged in mains frequency adjusting control strategy, stage type photovoltaic generation can actively adjust low-pressure side DC voltage to respond System frequency changes.
A kind of stage type photovoltaic generation that the present embodiment demonstrates the present invention participates in having for mains frequency adjusting control strategy Effect property and feasibility.
The embodiment that the specific embodiment of the invention provides, it is not exhaustive, it does not constitute to claims It limits, the enlightenment that those skilled in the art obtain according to embodiments of the present invention would occur to other without creative work Substantially equivalent replacement, all falls in the scope of protection of the present invention.

Claims (1)

1. a kind of stage type photovoltaic generation is actively engaged in mains frequency adjusting control strategy, characterized in that it includes the following steps：
(1) stage type photovoltaic generating system mesolow side DC voltage U is measuredPV, give a low-pressure side direct voltage reference value UPVref, by low-pressure side DC voltage UPVWith low-pressure side direct voltage reference value UPVrefVoltage difference be input in PI controllers, Duty ratio d is sent to PWM links and is given birth to by the duty ratio d that a Boost is calculated by the time-domain expression of PI controllers At driving pulse, driving Boost works, and the time-domain expression of PI controllers is：
D=Kp(UPV-UPVref)+Ki∫(UPV-UPVref)dt
In formula, KPFor proportionality coefficient, KiFor integral coefficient；
(2) stage type photovoltaic generating system mesohigh side DC voltage U is measureddc, measure grid-connected electric current ia、ib、ic, grid-connected Point voltage uta、utb、utc, handle to obtain the watt current i of d axis components by Park Transformationd, q axis components reactive current iq、d The active voltage U of axis componenttd, q axis components reactive voltage Utq；
(3) a high-pressure side direct voltage reference value U is givendcref, by high-pressure side DC voltage UdcJoin with high-pressure side DC voltage Examine value UdcrefVoltage difference be input in PI controllers, it is active to calculate a d axis by the time-domain expression of PI controllers Current reference instructs idref, by reactive power Q and reactive power reference qref QrefIdle difference be input in PI controllers, pass through The time-domain expression for crossing PI controllers calculates a q axis reactive current reference instructions iqref, the time-domain expression of PI controllers For：idref=Kp(Udc-Udcref)+Ki∫(Udc-Udcref)dt,iqref=Kp(Q-Qref)+Ki∫(Q-Qref)dt；
(4) on the basis of step (3), f-U in being introduced intodcLinear compensation link, to correct d axis watt current reference instructions idref1
In formula, HPVFor the virtual inertia constant of voltage source converter, Udc0For high-pressure side DC voltage initial value, f0For at the beginning of power grid Beginning frequency；
(5) the watt current i of d axis components will be obtained in step (2)d, d axis components reactive current iqRespectively in step (4) D axis watt current reference instructions idref1, the idle reference current of q axis instructs i in step (3)qrefIt is poor to make, and difference input PI is controlled Device processed calculates d axis net side inverter output voltages U by the time-domain expression of PI controllersd, the output of q axis net side inverters Voltage Uq, the time-domain expression of PI controllers is：Ud=Kp(idref1-id)+Ki∫(idref1-id) dt, Uq=Kp(iqref-iq)+Ki∫ (iqref-iq)dt；
(6) by d axis net side inverter output voltages Ud, q axis net side inverter output voltages UqIt send to PWM links and generates driving arteries and veins Punching, driving net side inverter work；
(7) when mains frequency, which exists, to be disturbed, the high-pressure side DC voltage in stage type photovoltaic generation perceives mains frequency first Fluctuation, due to high-pressure side DC voltage UdcWith low-pressure side DC voltage UPVMeet UPV=d × UdcRelationship, mains frequency disturbance Low-pressure side DC voltage U can be transferred toPV, then low-pressure side direct current is adjusted by adjusting the control bandwidth of Boost Press UPVDynamic response, and then adjust photovoltaic generation output power, it made to be actively engaged in mains frequency adjusting.
CN201810838580.XA 2018-07-27 2018-07-27 Two-stage type photovoltaic power generation active participation power grid frequency regulation control strategy Active CN108777497B (en)

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CN110350551A (en) * 2019-06-11 2019-10-18 华中科技大学 A kind of direct amplitude-frequency control method and system of grid-connected converting means electric current of voltage-source type
CN110739707A (en) * 2019-11-29 2020-01-31 科华恒盛股份有限公司 Reactive power closed-loop control method and device for single-phase grid-connected inverter
CN111555354A (en) * 2020-05-25 2020-08-18 国网重庆市电力公司电力科学研究院 Control method and device for autonomous renewable micro-grid system and storage medium
CN113659625A (en) * 2021-08-18 2021-11-16 西交利物浦大学 Power control method and device of photovoltaic system and storage medium

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CN107968417A (en) * 2017-12-20 2018-04-27 长沙理工大学 A kind of three-phase two-stage type photovoltaic system participates in the control method for coordinating that mains frequency is adjusted
CN108233415A (en) * 2018-01-15 2018-06-29 合肥工业大学 Two-stage type photovoltaic DC-to-AC converter virtual synchronous generator control method

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US20170199502A1 (en) * 2014-07-10 2017-07-13 Nr Electric Co., Ltd. Line power control method and system for unified power flow controller
CN104300820A (en) * 2014-09-25 2015-01-21 南京航空航天大学 Digital control method of two-stage three-phase three-level photovoltaic grid-connected inverter
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CN106816890A (en) * 2016-09-30 2017-06-09 中国电力科学研究院 A kind of photovoltaic plant frequency adjustment method and system
CN107968417A (en) * 2017-12-20 2018-04-27 长沙理工大学 A kind of three-phase two-stage type photovoltaic system participates in the control method for coordinating that mains frequency is adjusted
CN108233415A (en) * 2018-01-15 2018-06-29 合肥工业大学 Two-stage type photovoltaic DC-to-AC converter virtual synchronous generator control method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110350551A (en) * 2019-06-11 2019-10-18 华中科技大学 A kind of direct amplitude-frequency control method and system of grid-connected converting means electric current of voltage-source type
CN110350551B (en) * 2019-06-11 2021-12-03 华中科技大学 Direct current amplitude-frequency control method and system for voltage source type grid-connected conversion device
CN110739707A (en) * 2019-11-29 2020-01-31 科华恒盛股份有限公司 Reactive power closed-loop control method and device for single-phase grid-connected inverter
CN111555354A (en) * 2020-05-25 2020-08-18 国网重庆市电力公司电力科学研究院 Control method and device for autonomous renewable micro-grid system and storage medium
CN113659625A (en) * 2021-08-18 2021-11-16 西交利物浦大学 Power control method and device of photovoltaic system and storage medium
CN113659625B (en) * 2021-08-18 2023-09-05 西交利物浦大学 Power control method, equipment and storage medium of photovoltaic system

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