CN114530883A - Power control method, device and system of light storage integrated grid-connected inverter - Google Patents

Power control method, device and system of light storage integrated grid-connected inverter Download PDF

Info

Publication number
CN114530883A
CN114530883A CN202210052631.2A CN202210052631A CN114530883A CN 114530883 A CN114530883 A CN 114530883A CN 202210052631 A CN202210052631 A CN 202210052631A CN 114530883 A CN114530883 A CN 114530883A
Authority
CN
China
Prior art keywords
phase
photovoltaic
grid
voltage
current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210052631.2A
Other languages
Chinese (zh)
Inventor
张晓华
庞博
董杰
刘少宇
许�鹏
刘珅
赵建军
虞跃
赵盟
王宏波
潘宇
龙飞
宗瑾
齐鹏
张新一
安育伦
张鹏
林硕
梁晔
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Jibei Power Co ltd Smart Distribution Network Center
State Grid Jibei Electric Power Co Ltd
NARI Nanjing Control System Co Ltd
Qinhuangdao Power Supply Co of State Grid Jibei Electric Power Co Ltd
Original Assignee
State Grid Jibei Power Co ltd Smart Distribution Network Center
State Grid Jibei Electric Power Co Ltd
NARI Nanjing Control System Co Ltd
Qinhuangdao Power Supply Co of State Grid Jibei Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Jibei Power Co ltd Smart Distribution Network Center, State Grid Jibei Electric Power Co Ltd, NARI Nanjing Control System Co Ltd, Qinhuangdao Power Supply Co of State Grid Jibei Electric Power Co Ltd filed Critical State Grid Jibei Power Co ltd Smart Distribution Network Center
Priority to CN202210052631.2A priority Critical patent/CN114530883A/en
Publication of CN114530883A publication Critical patent/CN114530883A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • H02J3/381—Dispersed generators
    • 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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
    • 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

Abstract

The invention discloses a power control method, a device and a system of a light storage integrated grid-connected inverter, wherein the method comprises the steps of inputting three-phase power grid voltage and three-phase power grid current into an alternating-current side power controller, and outputting a three-phase initial modulation wave signal after processing; inputting photovoltaic voltage and photovoltaic current to a direct current side photovoltaic power controller, and outputting control parameters after processing; calculating an asymmetric triangular carrier based on the photovoltaic voltage and the energy storage voltage; and inputting the three-phase initial modulation wave signal, the control parameter and the asymmetric triangular carrier into an asymmetric carrier pulse width modulator to generate a PWM signal for controlling a switching tube of an inverter bridge in the grid-connected inverter. According to the invention, the direct-current side photovoltaic power controller outputs control parameters to modify the three-phase modulation wave output by the direct-current side power controller, and the modified modulation wave signal is compared with the asymmetric triangular carrier to generate the PWM driving signal, so that the power control of the optical storage integrated grid-connected inverter is realized.

Description

Power control method, device and system of light storage integrated grid-connected inverter
Technical Field
The invention belongs to the technical field of control of power electronic converters, and particularly relates to a power control method, device and system of a light storage integrated grid-connected inverter.
Background
In recent years, with the increasing problems of resource shortage, environmental pollution, and the like, renewable energy sources such as solar energy, wind energy, and the like have attracted attention. Under the influence of weather and environment, photovoltaic output power shows volatility. In order to stabilize the photovoltaic power fluctuation, a corresponding energy storage device is often configured in the photovoltaic power generation system to form a light storage integrated system.
The typical light-storage integrated system mainly comprises two types, wherein one type is that photovoltaic energy and stored energy are respectively connected to an alternating current power grid through respective DC/AC converters, and the other type is that the light-storage energy and the stored energy are respectively connected to a public direct current bus through the DC/DC converters and then connected to the alternating current power grid through a centralized DC/AC converter. These conventional integrated optical storage systems require multiple power electronic converters, which are costly and inefficient.
Disclosure of Invention
Aiming at the problems, the invention provides a power control method, a device and a system of a light storage integrated grid-connected inverter, wherein a direct current side photovoltaic power controller outputs control parameters to modify a three-phase modulation wave output by a direct current side power controller, the modified modulation wave signal is compared with an asymmetric triangular carrier to generate a PWM (pulse width modulation) driving signal, the asymmetric triangular carrier in the control method can adapt to voltage changes of photovoltaic and energy storage, and the power controller on the alternating current side and the direct current side realizes power control by modifying the modulation wave signal in real time.
In order to achieve the technical purpose and achieve the technical effects, the invention is realized by the following technical scheme:
in a first aspect, the invention provides a power control method for a light storage integrated grid-connected inverter, which includes:
acquiring three-phase power grid voltage, three-phase power grid current, photovoltaic voltage, photovoltaic current and energy storage voltage;
inputting the three-phase power grid voltage and the three-phase power grid current to an alternating-current side power controller, and outputting a three-phase initial modulation wave signal after processing;
inputting the photovoltaic voltage and the photovoltaic current to a direct-current side photovoltaic power controller, and outputting control parameters after processing;
calculating an asymmetric triangular carrier wave based on the photovoltaic voltage and the energy storage voltage;
and inputting the three-phase initial modulation wave signal, the control parameter and the asymmetric triangular carrier wave into an asymmetric carrier wave width modulator to generate a PWM signal, wherein the PWM signal is used for controlling a switching tube of an inverter bridge in the grid-connected inverter.
Optionally, the method further comprises:
and when the three-phase power grid voltage is over-voltage and/or the three-phase power grid current is over-current, setting all the PWM signals to be low levels, and enabling the grid-connected inverter to be shut down.
Optionally, the control parameter is obtained by the following processing method:
calculating photovoltaic power based on the photovoltaic voltage and the photovoltaic current;
and after the photovoltaic power is output by the MPPT algorithm, a control parameter k is output by the amplitude limiting unit, wherein the range of k is more than or equal to 0 and less than or equal to 1, and the control parameter is used for correcting the initial modulation wave output by the power controller at the alternating current side.
Optionally, the asymmetric carrier pulse width modulator includes a modulated wave correction calculation unit and a comparison unit for an asymmetric carrier, which are connected to each other.
Optionally, the modulated wave correction calculation unit performs the steps of:
solving the minimum value and the maximum value of the three-phase initial modulation wave signal;
calculating the correction quantity of the modulation wave by combining the output parameters;
and superposing the correction quantity to the three-phase initial modulation wave signal, and calculating the corrected three-phase modulation wave signal.
Optionally, the minimum value of the three-phase initial modulation wave signal is calculated by the following formula:
umin＝min(ua,ub,uc)
Figure BDA0003474905830000021
the maximum value of the three-phase initial modulation wave signal is calculated by the following formula:
umax＝max(ua,ub,uc)；
the correction amount of the modulation wave is calculated by the following formula:
u0＝(umax-umin-2)·k+1-umax
the corrected three-phase modulation wave signal is calculated by the following formula:
Figure BDA0003474905830000022
where m and θ are the modulation ratio and phase, respectively, and k is the control parameter.
Optionally, the comparing unit for the asymmetric carrier performs the following steps:
comparing the corrected three-phase modulation wave signal with an asymmetric triangular carrier wave to generate a PWM driving signal, wherein the triangular carrier wave frequency and the phase are the same, the amplitude is different, and the three-phase modulation wave signal is laminated on the triangular carrier waveIn the interval with ordinate of-1 to 1, the 1 st and 2 nd carriers are recorded as u from top to bottomtri1、utri2。
Optionally, the amplitude expression of the carrier wave is:
Figure BDA0003474905830000031
wherein: u shapePVFor photovoltaic voltage, UESSIs the stored energy voltage.
In a second aspect, the present invention provides a power control apparatus for an optical storage integrated grid-connected inverter, including:
the acquisition module is used for acquiring three-phase power grid voltage, three-phase power grid current, photovoltaic voltage, photovoltaic current and energy storage voltage;
the first processing module is used for inputting the three-phase power grid voltage and the three-phase power grid current to the alternating-current side power controller, and outputting a three-phase initial modulation wave signal after processing;
the second processing module is used for inputting the photovoltaic voltage and the photovoltaic current to the direct-current side photovoltaic power controller, and outputting control parameters after processing;
the calculation module is used for calculating the asymmetric triangular carrier wave based on the photovoltaic voltage and the energy storage voltage;
and the control module is used for inputting the three-phase initial modulation wave signal, the control parameter and the asymmetric triangular carrier wave into the asymmetric carrier wave width modulator to generate a PWM signal, and the PWM signal is used for controlling a switching tube of an inverter bridge in the grid-connected inverter.
In a third aspect, the present invention provides a power control device for an optical storage integrated grid-connected inverter, including: the system comprises an AC side power controller, a DC side photovoltaic power controller and an asymmetric carrier pulse width modulator;
the alternating current side power controller receives three-phase power grid voltage and three-phase power grid current, and outputs a three-phase initial modulation wave signal after processing;
the direct current side photovoltaic power controller receives photovoltaic voltage and photovoltaic current, and outputs control parameters after processing;
the asymmetric carrier pulse width modulator generates a PWM signal based on the three-phase initial modulation wave signal, the control parameter and an asymmetric triangular carrier, the PWM signal is used for controlling a switching tube of an inverter bridge in a grid-connected inverter, and the asymmetric triangular carrier is obtained based on photovoltaic voltage and energy storage voltage calculation.
Optionally, the ac-side power controller includes a dq conversion module, an active current loop regulator, a dq inverse conversion module, and a phase-locked loop, which are connected in sequence, wherein an input end of the phase-locked loop is connected to a three-phase grid voltage, and an output end of the phase-locked loop is connected to the dq conversion module and the dq inverse conversion module, respectively; three-phase network current iga,igb,igcGenerating a d-axis current signal i under a dq coordinate system through the dq conversion modulegdAnd q-axis current signal igq(ii) a d-axis current reference signal igdrefAnd d-axis current signal igdSubtracting, and outputting d-axis modulation signal u after passing through an active current loop regulatord(ii) a q-axis current reference signal igqrefAnd q-axis current signal igqSubtracting, and outputting a q-axis modulation signal u after passing through a reactive current loop regulatorq(ii) a Modulation signal u in dq coordinate systemdAnd uqAfter passing through the dq inverse transformation module, generating a three-phase primary modulation wave signal ua,ub,uc。
Optionally, the dc-side photovoltaic power controller includes an MPPT controller and a clipping unit connected in sequence; the MPPT controller is based on the photovoltaic voltage UPVPhotovoltaic current IPVAnd calculating the photovoltaic power, processing the photovoltaic power by using an MPPT algorithm, and outputting a control parameter k through an amplitude limiting unit, wherein the range of k is more than or equal to 0 and less than or equal to 1, and the control parameter is used for correcting an initial modulation wave output by the power controller at the alternating current side so as to realize power regulation.
Optionally, the asymmetric carrier pulse width modulator includes a modulated wave correction calculation unit and a comparison unit for an asymmetric carrier, which are connected to each other; the modulated wave correction calculation unit executes the steps of:
solving the minimum value and the maximum value of the three-phase initial modulation wave signal;
calculating the correction quantity of the modulation wave by combining the output parameters;
superposing the correction quantity to the three-phase initial modulation wave signal, and calculating the corrected three-phase modulation wave signal;
the comparing unit of the asymmetric carrier wave executes the following steps:
comparing the corrected three-phase modulation wave signal with an asymmetric triangular carrier wave to generate a PWM driving signal, wherein the triangular carrier wave frequency and the phase are the same, the amplitude is unequal, the three-phase modulation wave signal is stacked in a range with the ordinate of-1 to 1, the 1 st carrier wave and the 2 nd carrier wave are sequentially arranged from top to bottom and are marked as utri1、utri2。
Optionally, the minimum value of the three-phase initial modulation wave signal is calculated by the following formula:
umin＝min(ua,ub,uc)
Figure BDA0003474905830000041
the maximum value of the three-phase initial modulation wave signal is calculated by the following formula:
umax＝max(ua,ub,uc)；
the correction amount of the modulation wave is calculated by the following formula:
u0＝(umax-umin-2)·k+1-umax
the corrected three-phase modulation wave signal is calculated by the following formula:
Figure BDA0003474905830000042
where m and θ are the modulation ratio and phase, respectively, and k is the control parameter.
Optionally, the amplitude expression of the carrier wave is:
Figure BDA0003474905830000051
wherein: u shapePVFor photovoltaic voltage, UESSIs the stored energy voltage.
In a fourth aspect, the invention provides a power control system of an optical storage integrated grid-connected inverter, which comprises a storage medium and a processor;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of the first aspects.
Compared with the prior art, the invention has the beneficial effects that:
the invention uses the DC side photovoltaic power controller to output control parameters to modify the three-phase modulation wave output by the DC side power controller, the modified modulation wave signal is compared with the asymmetric triangular carrier to generate PWM driving signal, the asymmetric triangular carrier in the control method can adapt to the voltage change of photovoltaic and energy storage, and the AC side power controller realizes power control by modifying the modulation wave signal in real time.
The invention can realize smooth power regulation among photovoltaic, energy storage and alternating current power grids, and has simple control algorithm and easy realization.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which:
fig. 1 is a topological diagram of a typical optical storage integrated grid-connected inverter;
FIG. 2 is a flow chart of a control method provided in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a control device provided in one embodiment of the present invention;
fig. 4 is a simulation waveform using the control method provided in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
The application of the principles of the present invention will now be described in detail with reference to the accompanying drawings.
The light-storage integrated grid-connected inverter adopts an integrated DC/AC converter to be simultaneously connected with a photovoltaic power grid, an energy storage grid and an alternating current grid, and has the advantages of simple structure, high integration level, high efficiency and the like. The integrated grid-connected inverter based on the three-level structure is a typical circuit topology, as shown in fig. 1. The direct current side of the photovoltaic energy storage device is respectively connected with the photovoltaic energy storage device and the energy storage device, and the alternating current side of the photovoltaic energy storage device is connected with an alternating current power grid. Photovoltaic and storage voltages are noted as U, respectivelyPVAnd UESSThe AC mains voltage is denoted uga,ugb,ugc. The main power circuit of the inverter comprises 12 switching tubes (S)a1～Sa4、Sb1～Sb4、Sc1～Sc4) 6 diodes (D)a1～Da2、Db1～Db2、Dc1～Dc2) And 3 filter inductors (L)a、Lb、Lc)。
Example 1
The embodiment of the invention provides a power control method of a light storage integrated grid-connected inverter, which specifically comprises the following steps as shown in fig. 2:
collecting three-phase grid voltage uga,ugb,ugcThree-phase network current iga,igb,igcPhotovoltaic voltage UPVPhotovoltaic current IPVAnd an energy storage voltage UESS；
The three-phase network voltage uga,ugb,ugcAnd three-phase network current iga,igb,igcInputting the signal to an AC side power controller, realizing AC side power control through an active and reactive current loop under a dq axis, and then outputting a three-phase initial modulation wave signal ua,ub,uc；
Applying the photovoltaic voltage UPVPhotovoltaic current IPVInputting the voltage to a DC side photovoltaic power controller, and outputting a control parameter k after processing, wherein k is within the range of 0-1;
calculating an asymmetric triangular carrier wave based on the photovoltaic voltage and the energy storage voltage;
the three-phase initial modulation wave signal ua,ub,ucThe control parameter k and the asymmetric triangular carrier are input to an asymmetric carrier pulse width modulator to generate a PWM signal, and the PWM signal is used for controlling a switching tube of an inverter bridge in a grid-connected inverter;
and when the three-phase power grid voltage is over-voltage and/or the three-phase power grid current is over-current, setting all the PWM signals to be low levels, so that the grid-connected inverter is shut down, and otherwise, waiting for the next periodic signal to return to the initial step to start execution.
In a specific implementation manner of the embodiment of the present invention, the control parameter is obtained by the following processing method:
based on the photovoltaic voltage UPVPhotovoltaic current IPVCalculating the photovoltaic power;
and after the photovoltaic power is output by the MPPT algorithm, a control parameter k is output by the amplitude limiting unit, wherein the range of k is more than or equal to 0 and less than or equal to 1, and the control parameter is used for correcting the initial modulation wave output by the power controller at the alternating current side.
In a specific implementation manner of the embodiment of the present invention, the asymmetric carrier pulse width modulator includes a modulated wave correction calculation unit and a comparison unit for an asymmetric carrier, which are connected to each other.
Wherein the modulated wave correction calculation unit executes the steps of:
obtaining the minimum value and the maximum value of the three-phase initial modulation wave signals; the minimum value of the three-phase initial modulation wave signal is calculated by the following formula:
umin＝min(ua,ub,uc)
Figure BDA0003474905830000071
the maximum value of the three-phase initial modulation wave signal is calculated by the following formula:
umax＝max(ua,ub,uc)；
calculating the correction quantity of the modulation wave by combining the output parameters; the correction amount of the modulation wave is calculated by the following formula:
u0＝(umax-umin-2)·k+1-umax
superposing the correction quantity to the three-phase initial modulation wave signal, and calculating the corrected three-phase modulation wave signal; the corrected three-phase modulation wave signal is calculated by the following formula:
Figure BDA0003474905830000072
where m and θ are the modulation ratio and phase, respectively, and k is the control parameter.
In a specific implementation manner of the embodiment of the present invention, the comparing unit for the asymmetric carrier performs the following steps:
comparing the corrected three-phase modulation wave signal with an asymmetric triangular carrier wave to generate a PWM driving signal, wherein the triangular carrier wave frequency and the phase are the same, the amplitude is different, the three-phase modulation wave signal is stacked in a range with the ordinate of-1 to 1, the 1 st carrier wave and the 2 nd carrier wave are sequentially arranged from top to bottom and are marked as utri1、utri2。
Wherein the amplitude expression of the carrier wave is:
Figure BDA0003474905830000073
wherein: u shapePVFor photovoltaic voltage, UESSIs the stored energy voltage.
In order to verify the effectiveness of the power control method, the invention provides a specific example, and the main parameters of the specific example are as follows:
photovoltaic voltage UPV＝800V；
Energy storage voltage UESS＝360V；
Effective value U of line voltage of alternating current power gridAC(RMS)＝380V；
Rated power P at AC sideAC＝30kW；
Switching frequency fs＝10kHz；
Filter inductance La＝Lb＝Lc＝3mH；
The simulation waveform using the control method provided by the present invention shown in fig. 2 is shown in fig. 4. As can be seen from the figure, when the rated power of the alternating current side is 30kW and the photovoltaic MPPT power is 17kW, the residual required power is 13kW, the power regulation among the photovoltaic power, the stored energy and the alternating current power grid is realized, and the effectiveness of the control method is verified.
Example 2
Based on the same inventive concept as embodiment 1, an embodiment of the present invention provides a power control apparatus suitable for an optical storage integrated grid-connected inverter, including:
the acquisition module is used for acquiring three-phase power grid voltage, three-phase power grid current, photovoltaic voltage and photovoltaic current;
the first processing module is used for inputting the three-phase power grid voltage and the three-phase power grid current to the alternating-current side power controller, and outputting a three-phase initial modulation wave signal after processing;
the second processing module is used for inputting the photovoltaic voltage and the photovoltaic current to the direct-current side photovoltaic power controller, and outputting control parameters after processing;
the calculation module is used for calculating the asymmetric triangular carrier wave based on the photovoltaic voltage and the energy storage voltage;
and the control module is used for inputting the three-phase initial modulation wave signal, the control parameter and the asymmetric triangular carrier wave into the asymmetric carrier wave width modulator to generate a PWM signal, and the PWM signal is used for controlling a switching tube of an inverter bridge in the grid-connected inverter.
Example 3
Based on the same inventive concept as embodiment 1, as shown in fig. 3, an embodiment of the present invention provides a power control apparatus suitable for an optical storage integrated grid-connected inverter, including: the system comprises an AC side power controller, a DC side photovoltaic power controller and an asymmetric carrier pulse width modulator;
the AC side power controller receives three-phase power grid voltage uga,ugb,ugcAnd three-phase network current iga,igb,igcAfter being processed, the three-phase initial modulation wave signal u is outputa,ub,uc；
The DC side photovoltaic power controller receives a photovoltaic voltage UPVAnd photovoltaic current IPVOutputting a control parameter k after processing;
the asymmetric carrier pulse width modulator is based on a received three-phase initial modulation wave signal ua,ub,ucThe control parameter k and the asymmetric triangular carrier wave generate PWM signals, and the PWM signals are used for controlling a switching tube of an inverter bridge in the grid-connected inverter; the asymmetric triangular carrier wave is obtained based on photovoltaic voltage and energy storage voltage calculation.
In a specific implementation manner of the embodiment of the present invention, the ac-side power controller includes a dq conversion module, an active current loop regulator, a dq inverse conversion module, and a phase-locked loop, which are sequentially connected to each other, wherein an input end of the phase-locked loop is connected to a three-phase power grid voltage, and an output end of the phase-locked loop is respectively connected to the dq conversion module and the dq inverse conversion module. Three-phase network current iga,igb,igcGenerating a d-axis current signal i under a dq coordinate system through the dq conversion modulegdAnd q-axis current signal igq. d-axis current reference signal igdrefAnd d-axis current signal igdSubtracting, and outputting d-axis modulation signal u after passing through an active current loop regulatord(ii) a q-axis current reference signal igqrefAnd q-axis current signal igqSubtracting, and outputting a q-axis modulation signal u after passing through a reactive current loop regulatorq. Modulation signal u in dq coordinate systemdAnd uqAfter passing through the dq inverse transformation module, generating a three-phase primary modulation wave signal ua,ub,uc。
In a specific implementation manner of the embodiment of the present invention, the dc-side photovoltaic power controller includes an MPPT controller and a clipping unit, which are sequentially connected; the MPPT controller is based on the photovoltaic voltage UPVPhotovoltaic current IPVAnd calculating the photovoltaic power, processing the photovoltaic power by using an MPPT algorithm, and outputting a control parameter k through an amplitude limiting unit, wherein the range of k is more than or equal to 0 and less than or equal to 1, and the control parameter is used for correcting an initial modulation wave output by the power controller at the alternating current side so as to realize power regulation.
In a specific implementation manner of the embodiment of the present invention, the asymmetric carrier pulse width modulator includes a modulated wave correction calculation unit and a comparison unit for comparing the asymmetric carrier, which are connected to each other.
Wherein the modulated wave correction calculation unit executes the steps of:
solving the minimum value and the maximum value of the three-phase initial modulation wave signal; the minimum value of the three-phase initial modulation wave signal is calculated by the following formula:
umin＝min(ua,ub,uc)
Figure BDA0003474905830000091
the maximum value of the three-phase initial modulation wave signal is calculated by the following formula:
umax＝max(ua,ub,uc)；
calculating the correction quantity of the modulation wave by combining the output parameters; the correction amount of the modulation wave is calculated by the following formula:
u0＝(umax-umin-2)·k+1-umax
superposing the correction quantity to the three-phase initial modulation wave signal, and calculating the corrected three-phase modulation wave signal; the corrected three-phase modulation wave signal is calculated by the following formula:
Figure BDA0003474905830000092
where m and θ are the modulation ratio and phase, respectively, and k is a control parameter.
In a specific implementation manner of the embodiment of the present invention, the comparing unit for the asymmetric carrier performs the following steps:
and comparing the corrected three-phase modulation wave signal with an asymmetric triangular carrier to generate a PWM (pulse-width modulation) driving signal, wherein the asymmetric triangular carrier is obtained by calculation based on photovoltaic voltage and energy storage voltage, the triangular carrier frequencies and phases are the same, the amplitudes are different, the triangular carrier frequencies and the phases are stacked in an interval with the ordinate of-1 to 1, the 1 st carrier and the 2 nd carrier are sequentially arranged from top to bottom and are marked as u carrierstri1、utri2。
Wherein the amplitude expression of the carrier wave is:
Figure BDA0003474905830000101
wherein: u shapePVFor photovoltaic voltage, UESSIs the stored energy voltage.
Example 4
The embodiment of the invention provides a power control system suitable for a light storage integrated grid-connected inverter, which comprises a storage medium and a processor, wherein the storage medium is used for storing a power control signal;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any of embodiment 1.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (16)

1. A power control method of a light storage integrated grid-connected inverter is characterized by comprising the following steps:
acquiring three-phase power grid voltage, three-phase power grid current, photovoltaic voltage, photovoltaic current and energy storage voltage;
inputting the three-phase power grid voltage and the three-phase power grid current to an alternating-current side power controller, and outputting a three-phase initial modulation wave signal after processing;
inputting the photovoltaic voltage and the photovoltaic current to a direct-current side photovoltaic power controller, and outputting control parameters after processing;
calculating an asymmetric triangular carrier wave based on the photovoltaic voltage and the energy storage voltage;
and inputting the three-phase initial modulation wave signal, the control parameter and the asymmetric triangular carrier wave into an asymmetric carrier wave width modulator to generate a PWM signal, wherein the PWM signal is used for controlling a switching tube of an inverter bridge in the grid-connected inverter.
2. The power control method of the light-storage integrated grid-connected inverter according to claim 1, characterized in that: the method further comprises the following steps:
and when the three-phase power grid voltage is over-voltage and/or the three-phase power grid current is over-current, setting all the PWM signals to be low levels, and enabling the grid-connected inverter to be shut down.
3. The power control method of the grid-connected inverter integrating light storage and energy storage according to claim 1, wherein the control parameters are obtained by the following processing method:
calculating photovoltaic power based on the photovoltaic voltage and the photovoltaic current;
and after the photovoltaic power is output by the MPPT algorithm, a control parameter k is output by the amplitude limiting unit, wherein the range of k is more than or equal to 0 and less than or equal to 1, and the control parameter is used for correcting the initial modulation wave output by the power controller at the alternating current side.
4. The power control method of the light-storage integrated grid-connected inverter according to claim 1, characterized in that: the asymmetric carrier pulse width modulator comprises a modulation wave correction calculation unit and a comparison unit of the asymmetric carrier which are connected.
5. The power control method of the light-storage integrated grid-connected inverter according to claim 4, characterized in that: the modulated wave correction calculation unit executes the steps of:
solving the minimum value and the maximum value of the three-phase initial modulation wave signal;
calculating the correction quantity of the modulation wave by combining the output parameters;
and superposing the correction quantity to the three-phase initial modulation wave signal, and calculating the corrected three-phase modulation wave signal.
6. The power control method of the grid-connected inverter integrated with light storage according to claim 4, wherein the minimum value of the three-phase initial modulation wave signal is calculated by the following formula:
umin＝min(ua,ub,uc)
Figure FDA0003474905820000011
the maximum value of the three-phase initial modulation wave signal is calculated by the following formula:
umax＝max(ua,ub,uc)；
the correction amount of the modulation wave is calculated by the following formula:
u0＝(umax-umin-2)·k+1-umax
the corrected three-phase modulation wave signal is calculated by the following formula:
Figure FDA0003474905820000021
where m and θ are the modulation ratio and phase, respectively, and k is the control parameter.
7. The power control method of the light-storage integrated grid-connected inverter according to claim 5, characterized in that: the comparing unit of the asymmetric carrier wave executes the following steps:
and comparing the corrected three-phase modulation wave signal with an asymmetric triangular carrier to generate a PWM (pulse-width modulation) driving signal, wherein the triangular carrier frequency and the phase are the same, the amplitude is different, the three-phase modulation wave signal is stacked in a range with the ordinate of-1 to 1, the 1 st carrier and the 2 nd carrier are sequentially marked as u from top to bottomtri1、utri2。
8. The power control method of the light-storage integrated grid-connected inverter according to claim 6, characterized in that: the amplitude expression of the carrier wave is as follows:
Figure FDA0003474905820000022
wherein: u shapePVFor photovoltaic voltage, UESSIs the stored energy voltage.
9. The utility model provides a power control device of light storage integration grid-connected inverter which characterized in that includes:
the acquisition module is used for acquiring three-phase power grid voltage, three-phase power grid current, photovoltaic voltage, photovoltaic current and energy storage voltage;
the first processing module is used for inputting the three-phase power grid voltage and the three-phase power grid current to the alternating-current side power controller, and outputting a three-phase initial modulation wave signal after processing;
the second processing module is used for inputting the photovoltaic voltage and the photovoltaic current to the direct-current side photovoltaic power controller, and outputting control parameters after processing;
the calculation module is used for calculating the asymmetric triangular carrier wave based on the photovoltaic voltage and the energy storage voltage;
and the control module is used for inputting the three-phase initial modulation wave signal, the control parameter and the asymmetric triangular carrier wave into the asymmetric carrier wave width modulator to generate a PWM signal, and the PWM signal is used for controlling a switching tube of an inverter bridge in the grid-connected inverter.
10. A power control device of a light storage integrated grid-connected inverter comprises: the system comprises an AC side power controller, a DC side photovoltaic power controller and an asymmetric carrier pulse width modulator;
the alternating current side power controller receives three-phase power grid voltage and three-phase power grid current, and outputs a three-phase initial modulation wave signal after processing;
the direct current side photovoltaic power controller receives photovoltaic voltage and photovoltaic current, and outputs control parameters after processing;
the asymmetric carrier pulse width modulator generates a PWM signal based on the three-phase initial modulation wave signal, the control parameter and an asymmetric triangular carrier, the PWM signal is used for controlling a switching tube of an inverter bridge in a grid-connected inverter, and the asymmetric triangular carrier is obtained based on photovoltaic voltage and energy storage voltage calculation.
11. The power control device of the integrated grid-connected inverter for light storage according to claim 10, wherein the ac side power controller comprises a dq conversion module, an active current loop regulator, a dq inverse conversion module, and a phase-locked loop, which are connected in sequence, wherein an input end of the phase-locked loop is connected to a three-phase grid voltage, and an output end of the phase-locked loop is connected to the dq conversion module and the dq inverse conversion module, respectively; three-phase network current iga,igb,igcGenerating a d-axis current signal i under a dq coordinate system through the dq conversion modulegdAnd q-axis current signal igq(ii) a d-axis current reference signal igdrefAnd d-axis current signal igdSubtracting, and outputting d-axis modulation signal u after passing through an active current loop regulatord(ii) a q-axis current reference signal igqrefAnd q-axis current signal igqSubtracting, and outputting a q-axis modulation signal u after passing through a reactive current loop regulatorq(ii) a Modulation signal in dq coordinate systemudAnd uqAfter passing through the dq inverse transformation module, generating a three-phase primary modulation wave signal ua,ub,uc。
12. The power control device of the optical storage integrated grid-connected inverter according to claim 10, wherein the dc-side photovoltaic power controller comprises an MPPT controller and a limiting unit which are connected in sequence; the MPPT controller is based on the photovoltaic voltage UPVPhotovoltaic current IPVAnd calculating the photovoltaic power, processing the photovoltaic power by using an MPPT algorithm, and outputting a control parameter k through an amplitude limiting unit, wherein the range of k is more than or equal to 0 and less than or equal to 1, and the control parameter is used for correcting an initial modulation wave output by the power controller at the alternating current side so as to realize power regulation.
13. The power control device of the optical storage integrated grid-connected inverter according to claim 10, wherein the asymmetric carrier pulse width modulator comprises a modulation wave correction calculation unit and a comparison unit of an asymmetric carrier which are connected with each other; the modulated wave correction calculation unit executes the steps of:
obtaining the minimum value and the maximum value of the three-phase initial modulation wave signals;
calculating the correction quantity of the modulation wave by combining the output parameters;
superposing the correction quantity to the three-phase initial modulation wave signal, and calculating the corrected three-phase modulation wave signal;
the comparing unit of the asymmetric carrier wave executes the following steps:
comparing the corrected three-phase modulation wave signal with an asymmetric triangular carrier wave to generate a PWM driving signal, wherein the triangular carrier wave frequency and the phase are the same, the amplitude is unequal, the three-phase modulation wave signal is stacked in a range with the ordinate of-1 to 1, the 1 st carrier wave and the 2 nd carrier wave are sequentially arranged from top to bottom and are marked as utri1、utri2。
14. The power control device of the grid-connected inverter integrated with light and storage according to claim 13, wherein the minimum value of the three-phase initial modulation wave signal is calculated by the following formula:
umin＝min(ua,ub,uc)
Figure FDA0003474905820000041
the maximum value of the three-phase initial modulation wave signal is calculated by the following formula:
umax＝max(ua,ub,uc)；
the correction amount of the modulation wave is calculated by the following formula:
u0＝(umax-umin-2)·k+1-umax
the corrected three-phase modulation wave signal is calculated by the following formula:
Figure FDA0003474905820000042
where m and θ are the modulation ratio and phase, respectively, and k is the control parameter.
15. The power control device of the optical storage integrated grid-connected inverter according to claim 13, wherein the amplitude expression of the carrier wave is as follows:
Figure FDA0003474905820000043
wherein: u shapePVFor photovoltaic voltage, UESSIs the stored energy voltage.
16. The power control system of the light storage integrated grid-connected inverter is characterized by comprising a storage medium and a processor;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of claims 1 to 8.
CN202210052631.2A 2022-01-18 2022-01-18 Power control method, device and system of light storage integrated grid-connected inverter Pending CN114530883A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210052631.2A CN114530883A (en) 2022-01-18 2022-01-18 Power control method, device and system of light storage integrated grid-connected inverter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210052631.2A CN114530883A (en) 2022-01-18 2022-01-18 Power control method, device and system of light storage integrated grid-connected inverter

Publications (1)

Publication Number Publication Date
CN114530883A true CN114530883A (en) 2022-05-24

Family

ID=81620492

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210052631.2A Pending CN114530883A (en) 2022-01-18 2022-01-18 Power control method, device and system of light storage integrated grid-connected inverter

Country Status (1)

Country Link
CN (1) CN114530883A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116865584A (en) * 2023-09-04 2023-10-10 西安千帆翼数字能源技术有限公司 Two-level converter, control method, SPWM (sinusoidal pulse Width modulation) method and SPWM (sinusoidal pulse Width modulation) system
CN117856642B (en) * 2024-03-06 2024-05-10 东南大学 Network construction control method and medium applied to multiport optical storage integrated converter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116865584A (en) * 2023-09-04 2023-10-10 西安千帆翼数字能源技术有限公司 Two-level converter, control method, SPWM (sinusoidal pulse Width modulation) method and SPWM (sinusoidal pulse Width modulation) system
CN116865584B (en) * 2023-09-04 2023-11-21 西安千帆翼数字能源技术有限公司 Two-level converter, control method, SPWM (sinusoidal pulse Width modulation) method and SPWM (sinusoidal pulse Width modulation) system
CN117856642B (en) * 2024-03-06 2024-05-10 东南大学 Network construction control method and medium applied to multiport optical storage integrated converter

Similar Documents

Publication Publication Date Title
CN104158212B (en) A kind of many level photovoltaic generating system topological structure and control method thereof
CN103401463B (en) The miniature photovoltaic grid-connected inverter that dc-link capacitance reduces and control method
CN105048490B (en) The photovoltaic micro-inverter and its numerical control device of low current stress
CN113746357B (en) Electrolytic hydrogen production rectification power supply based on two-stage auxiliary converter and power supply control method
CN103532417B (en) A kind of control method of topology variable combining inverter
CN115250074B (en) Electrolytic hydrogen production rectifier with harmonic wave and ripple wave compensation function and control method
CN104638676A (en) Alternating current series photovoltaic power generation grid-connected system and control system and method thereof
CN102522910A (en) Mixed SVPWM control method used for three-phase grid-connected inverter
CN109120169A (en) A kind of pressure equalizing control method for cascade connection type two-stage type inverter
Anand et al. A Single phase Five level Inverter for Grid Connected Photovoltaic System by employing PID Controller
CN110783965B (en) Micro-source power coordination method suitable for micro-grid with MMC half-bridge series structure
CN114530883A (en) Power control method, device and system of light storage integrated grid-connected inverter
CN107968580B (en) One-way hybrid three-phase three-level rectifier
Parimalasundar et al. Investigation of efficient multilevel inverter for photovoltaic energy system and electric vehicle applications
CN116260348B (en) MMC-based high-capacity electrolytic hydrogen production hybrid rectifier and control method
CN107612027A (en) A kind of photovoltaic DC-to-AC converter DC voltage transient state falls suppressing method
CN203278685U (en) Inverter
CN113872209B (en) Single-phase photovoltaic grid-connected control method for eliminating DC bus voltage sampling ripple
CN113489363B (en) Bidirectional H6 photovoltaic grid-connected converter and modulation method thereof
CN112003319B (en) Double-current feedback control method applied to bidirectional grid-connected converter
CN113949294A (en) Isolated AC/DC converter control method based on modulation signal compensation
Lee et al. High efficiency grid-connected multi string PV PCS using H-bridge multi-level topology
CN107069820B (en) Distributed renewable energy power generation grid-connected power fluctuation control system and control method
CN113224964A (en) Control method of single-phase single-stage boost inverter
Zhang Design and Simulation Implementation of All-DC Offshore Wind Power System

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination