CN114447993A - Power control method, device, controller and optical storage system - Google Patents

Power control method, device, controller and optical storage system Download PDF

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Publication number
CN114447993A
CN114447993A CN202210367255.6A CN202210367255A CN114447993A CN 114447993 A CN114447993 A CN 114447993A CN 202210367255 A CN202210367255 A CN 202210367255A CN 114447993 A CN114447993 A CN 114447993A
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Prior art keywords
power
bus voltage
reference value
battery
storage system
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CN202210367255.6A
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CN114447993B (en
Inventor
姜亲宜
易德刚
陈健聪
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Shenzhen Sofarsolar Co Ltd
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Shenzhen Sofarsolar 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
    • H02J3/381—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
    • 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
    • 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
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Control Of Electrical Variables (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The embodiment of the invention relates to the technical field of power electronics, and discloses a power control method, a device, a controller and an optical storage system, wherein modules in the system at least comprise a photovoltaic module, a battery, a power grid and a load.

Description

Power control method, device, controller and optical storage system
Technical Field
The embodiment of the invention relates to the technical field of power electronics, in particular to a power control method, a power control device, a power controller and an optical storage system.
Background
A Photovoltaic energy storage system (also called a solar Photovoltaic energy storage power generation system) is a power generation system composed of Photovoltaic devices and energy storage devices. At present, due to the fact that a light storage system is related to energy management of Photovoltaic (PV), a battery, a load and a power grid, the related multiple working modes have complex control logic, and the control modes of systems of different manufacturers are different and are complex in general.
In implementing the embodiments of the present invention, the inventors found that at least the following problems exist in the above related art: in the use process of the light storage all-in-one machine, due to the fact that photovoltaic and load states are uncertain, energy scheduling needs to be controlled in real time, energy utilization rate is improved, economic benefits are generated to the maximum extent, the power of a required energy storage battery and the power of a required photovoltaic assembly are calculated by detecting grid-connected power and load power through a traditional energy control method, the power of the energy storage battery and the power of the photovoltaic assembly are controlled according to calculated values, the method is long in control process, generally needs more than several seconds, and the situation that certain special working conditions (such as backflow prevention) are difficult to control exists.
Disclosure of Invention
The embodiment of the application provides a power control method, a power control device, a controller and an optical storage system.
The purpose of the embodiment of the invention is realized by the following technical scheme:
in order to solve the above technical problem, in a first aspect, an embodiment of the present invention provides a power control method applied to a light storage system, where modules in the system at least include a photovoltaic module, a battery, a power grid, and a load, where the method includes: determining a bus voltage reference value of the light storage system according to the voltage data of the battery and the power grid; calculating a bus voltage reference value used by each module according to the bus voltage reference value of the optical storage system; and taking the bus voltage reference value used by each module as a control loop input, and independently adjusting the power of each module in the optical storage system.
In some embodiments, the determining a bus voltage reference value of the light storage system from the voltage data of the battery and the power grid comprises: acquiring an average voltage value of the battery and a first increase allowance of a bus voltage reference value used by a battery control module; acquiring a voltage effective value of the power grid and a second increase allowance of a bus voltage reference value used by a power grid control module; and acquiring the sum of the average voltage value of the battery and the first increase allowance and the larger value between the voltage effective value of the power grid and the sum of the second increase allowance, and assigning the larger value to a bus voltage reference value of the light storage system.
In some embodiments, the obtaining the average voltage value of the battery and the first margin of increase of the bus voltage reference value used by the battery control module comprises:
collecting a plurality of battery voltages in each power grid period and calculating an average value to obtain an average voltage value of the battery; determining a product of the average voltage value and a first preset multiple as the first increase margin, wherein the first preset multiple is less than 1.
In some embodiments, the obtaining of the second margin of increase of the voltage effective value of the power grid and the bus voltage reference value used by the grid control module includes: collecting the voltage of the power grid side for a plurality of times in the power grid period, and calculating the effective voltage value of the power grid through the following formula:
Vgrid=[1/T*∫(0→T) vg(t) dt]1/2
wherein Vgrid represents a voltage effective value of the power grid, T represents a period of the power grid, and vg (T) represents a voltage instantaneous value of the power grid; and determining the product of the voltage effective value of the power grid and a second preset multiple as the second increase allowance, wherein the second preset multiple is less than 1.
In some embodiments, the calculating a bus voltage reference value used by each module according to a bus voltage reference value of the light storage system includes: determining a third increase allowance according to the bus voltage ripple and the loop response speed of the light storage system; taking the sum of the third increase margin and a bus voltage reference value of the light storage system as a bus voltage reference value used by the battery control module; determining twice the third margin of increase as a fourth margin of increase; and taking the sum of the fourth increase allowance and a bus voltage reference value of the light storage system as a bus voltage reference value used by the photovoltaic control module.
In some embodiments, the light storage system further comprises a DC/AC converter, and the independently adjusting the power of each module in the light storage system by using the bus voltage reference value used by each module as a control loop input comprises: and when the photovoltaic power and the load power are changed, the bus voltage is simultaneously used as control loop feedback signals of the battery control module, the photovoltaic control module and the DC/AC converter, and a bus voltage reference value corresponding to each module is used as an input signal of each control loop, so that the bus voltage and the power supply state of the light storage system are automatically adjusted.
In some embodiments, the optical storage system further comprises a BOOST booster and a DC/DC converter, the adjusting the bus voltage and the power supply state of the optical storage system comprises: when the power of the photovoltaic is less than the power of the load, controlling the bus voltage to maintain a bus voltage reference value used by the battery control module, and controlling the battery to supply power to the load through the DC/DC converter and the DC/AC converter; when the power of the photovoltaic is larger than the power of the load and the bus voltage is larger than the bus voltage reference value used by the battery control module, the battery module automatically controls the bus voltage to maintain the bus voltage reference value used by the battery control module and controls the photovoltaic to supply power for the battery and the load through a bus; when the power of the photovoltaic is larger than the sum of the maximum powers of the load and the battery, and the bus voltage is larger than the bus voltage reference value used by the photovoltaic control module, controlling the bus voltage to be maintained at the bus voltage reference value used by the photovoltaic control module, and controlling the photovoltaic to supply power to the battery, the load and the power grid through a bus.
In some embodiments, the method further comprises: and when the backflow preventing working condition exists, taking the sum of the power of the load and the backflow preventing power as the power limiting value of the DC/AC converter.
In order to solve the above technical problem, in a second aspect, an embodiment of the present invention provides a power control apparatus applied to a light storage system, where modules in the system at least include a photovoltaic module, a battery, a power grid, and a load, and the apparatus includes: the determining unit is used for determining a bus voltage reference value of the light storage system according to the voltage data of the battery and the power grid; the calculation unit is used for calculating the bus voltage reference value used by each module according to the bus voltage reference value of the optical storage system; and the adjusting unit is used for taking the bus voltage reference value used by each module as the input of a control loop and independently adjusting the power of each module in the optical storage system.
In order to solve the above technical problem, in a third aspect, an embodiment of the present invention provides a controller, including: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of the first aspect as described above.
In order to solve the above technical problem, in a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the method according to the first aspect.
In order to solve the above technical problem, in a fifth aspect, the present invention further provides a computer program product, which includes a computer program stored on a computer-readable storage medium, the computer program including program instructions, which, when executed by a computer, cause the computer to execute the method according to the first aspect.
In order to solve the foregoing technical problem, in a sixth aspect, an embodiment of the present invention further provides an optical storage system, including: a photovoltaic, a BOOST booster, a DC/AC converter, a DC/DC converter, a battery, a grid, a load, and a controller as described in the third aspect, the controller being connected to the DC/AC converter and the DC/DC converter respectively, the photovoltaic being connected to the DC/AC converter through the BOOST booster, the DC/AC converter being further connected to the grid and the load respectively, the photovoltaic being further connected to the DC/DC converter through the BOOST booster, the DC/DC converter being further connected to the battery.
Compared with the prior art, the invention has the beneficial effects that: different from the prior art, the embodiment of the invention provides a power control method, a device, a controller and an optical storage system, wherein modules in the system at least comprise a photovoltaic module, a battery, a power grid and a load, the method firstly determines a bus voltage reference value of the optical storage system according to voltage data of the battery and the power grid, takes the working efficiency of the whole system into consideration, then calculates the bus voltage reference value used by each module according to the bus voltage reference value of the optical storage system, and independently adjusts the power of each module in the optical storage system by taking the bus voltage reference value used by each module as a control loop input, so that the response speed of energy scheduling is improved, and the control logic is simple.
Drawings
One or more embodiments are illustrated by the accompanying figures in the drawings that correspond thereto and are not to be construed as limiting the embodiments, wherein elements/modules and steps having the same reference numerals are represented by like elements/modules and steps, unless otherwise specified, and the drawings are not to scale.
Fig. 1 is a schematic diagram of an application environment of a power control method according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a power control method according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a sub-process of step S100 in the power control method shown in FIG. 2;
FIG. 4 is a schematic flow chart of a sub-process of step S200 in the power control method shown in FIG. 2;
FIG. 5 is a schematic flow chart of a sub-process of step S300 in the power control method shown in FIG. 2;
fig. 6 is a flowchart illustrating another power control method according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a power control apparatus according to a second embodiment of the present invention;
fig. 8 is a schematic structural diagram of a controller according to a third embodiment of the present invention;
fig. 9 is a schematic structural diagram of an optical storage system according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that, if not conflicted, the various features of the embodiments of the invention may be combined with each other within the scope of protection of the present application. Additionally, while functional block divisions are performed in apparatus schematics, with logical sequences shown in flowcharts, in some cases, steps shown or described may be performed in sequences other than block divisions in apparatus or flowcharts. Further, the terms "first," "second," "third," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In order to solve the problems that the existing optical storage system is complex in control mode and low in corresponding speed of energy scheduling, the embodiment of the invention provides a power control method, the method can determine the bus voltage reference value of the whole system based on the voltage data of a battery and a power grid in the system, and further determine the bus voltage reference value of each module as the input of a control loop, so that the fast energy scheduling is realized, and the control logic is clear and simple. And can be controlled simply when the backflow-preventing working condition exists.
Fig. 1 is a schematic diagram of an application environment of a power control method according to an embodiment of the present invention, where the application environment includes: the photovoltaic PV can transmit energy to the BUS BUS through the BOOST circuit and then provide the energy to the battery BAT through the DC/DC converter, or convert direct current into alternating current through the DC/AC converter and provide the alternating current to the GRID GRID and/or the LOAD LOAD, and when the energy of the photovoltaic PV is insufficient and the energy of the battery BAT is sufficient, the battery BAT can also transmit the energy to the BUS BUS through the DC/DC converter, so that the voltage stability of the BUS BUS is maintained, and the energy is provided to the GRID GRID and/or the LOAD LOAD. The power control method provided by the embodiment of the invention can collect voltage data of the battery BAT and the GRID, and can realize independent regulation of power of each module in the optical storage system by outputting a modulation signal to the BOOST booster, the DC/DC converter and/or the DC/AC converter.
Specifically, the embodiments of the present invention will be further explained below with reference to the drawings.
Example one
An embodiment of the present invention provides a power control method, where the method is applied to an optical storage system, where modules in the system at least include a photovoltaic module, a battery, a power grid, and a load, and the optical storage system may be the above application scenario and the optical storage system shown in fig. 1, please refer to fig. 2, which shows a flow of the power control method provided in the embodiment of the present invention, where the method includes, but is not limited to, the following steps:
step S100: determining a bus voltage reference value of the light storage system according to the voltage data of the battery and the power grid;
in the embodiment of the invention, the bus voltage reference value needs to be calculated according to the battery voltage and the power grid voltage at the same time, the bus voltage needs to be set in consideration of the overall working efficiency of the system and cannot exceed the bearing capacity of the hardware part of the system, the bus voltage reference value is dynamically changed, and therefore, before the bus voltage reference value of the whole system is calculated, the voltage data of the battery and the power grid need to be acquired, wherein the voltage of the battery and the voltage of the power grid side can be acquired through a hardware sampling circuit.
Specifically, referring to fig. 3, which shows a sub-process of step S100 in fig. 2 according to an embodiment of the present invention, the determining the bus voltage reference value of the optical storage system according to the voltage data of the battery and the power grid includes:
step S110: acquiring an average voltage value of the battery and a first increase allowance of a bus voltage reference value used by a battery control module;
in the embodiment of the invention, a plurality of Battery voltages are collected in each power grid period and the average value is calculated to obtain the average Voltage value (Vbat) of the Battery; determining the first increase margin Vstep1 as the product of the average voltage value Vbat and a first preset multiple, wherein the first preset multiple is smaller than 1. It should be noted that, due to the arrangement of the circuit structure, the reference value of the bus voltage used by the battery control module needs to be larger than the battery voltage, and if the first increase margin Vstep1 is set too large, the conversion efficiency is reduced, and if the first increase margin Vstep1 is set too small, the difficulty of the circuit control regulation is increased, therefore, preferably, the first preset multiple may be 0.2-0.4 times, that is, the first increase margin Vstep1 is equal to 0.2-0.4 times of the average voltage value Vbat of the battery, for the reasons of the conversion efficiency, the stress tolerance of the device, and the like.
Step S120: acquiring a voltage effective value of the power grid and a second increase allowance of a bus voltage reference value used by a power grid control module;
in the embodiment of the invention, the voltage of the power grid side is collected for a plurality of times in the period of the power grid, and the effective voltage value Vgrid of the power grid is calculated by the following formula:
Vgrid=[1/T*∫(0→T) vg(t) dt]1/2
wherein Vgrid represents a voltage effective value of the power grid, T represents a period of the power grid, vg (T) represents a voltage instantaneous value of the power grid; then, a product of the effective voltage value Vgrid of the power grid and a second preset multiple is determined as the second increase margin Vstep2, wherein the second preset multiple is smaller than 1. It should be noted that, due to the configuration of the circuit structure, the reference value of the bus voltage used by the grid control module needs to be greater than the peak voltage of the grid (i.e. 1.414 times the effective voltage Vgrid of the grid), and if the second increase margin Vstep2 is set too large, the conversion efficiency will be reduced, and if the second increase margin Vstep2 is set too small, the difficulty of the circuit control adjustment will be increased, so that, preferably, the second increase margin Vstep2 is 0.6-0.8 times the effective voltage Vgrid of the grid in consideration of the conversion efficiency and the stress tolerance of the device, etc., i.e. the second increase margin Vstep2 is equal to 0.6-0.8 times the effective voltage Vgrid of the grid.
Step S130: and acquiring the sum of the average voltage value of the battery and the first increase allowance and the larger value between the voltage effective value of the power grid and the sum of the second increase allowance, and assigning the larger value to a bus voltage reference value of the light storage system.
In the embodiment of the present invention, the average voltage value of the battery is added to the first increase margin to obtain a sum value Vbat + Vstep1, meanwhile, the voltage effective value of the power grid is added to the second increase margin to obtain a sum value Vgrid + Vstep2, and the two sum values Vbat + Vstep1 and Vgrid + Vstep2 are compared, where the larger value is a Bus voltage reference (Vbusref) of the optical storage system, and the larger value is also used as a Bus voltage reference of the DC/AC converter. It should be noted that, since the average voltage value Vbat of the battery and the effective voltage value Vgrid of the power grid are changed in real time, the bus voltage reference value Vbusref of the optical storage system is also a dynamic value.
Step S200: calculating a bus voltage reference value used by each module according to the bus voltage reference value of the optical storage system;
in the embodiment of the invention, the reference value of the bus voltage used by each module is required to be smaller than the maximum bearable voltage of the light storage system so as to ensure the power utilization safety.
Specifically, referring to fig. 4, it shows a sub-process of step S200 in fig. 2 according to an embodiment of the present invention, where calculating the bus voltage reference value used by each module according to the bus voltage reference value of the optical storage system includes:
step S210: determining a third increase allowance according to the bus voltage ripple and the loop response speed of the light storage system;
in the embodiment of the present invention, the third margin for increase Vstep3 is a difference between the bus voltage reference value used by the battery control module and the bus voltage reference value of the light storage system, is a margin set for increasing the bus voltage reference value used by the battery control module, is preset data, and needs to take a larger value, and when the third margin for increase Vstep3 is set, voltage ripple and loop response speed need to be considered, for example, may be set to any value between 10 and 20V.
Step S220: taking the sum of the third increase margin and a bus voltage reference value of the light storage system as a bus voltage reference value used by the battery control module;
in the embodiment of the present invention, after the third margin for increase Vstep3 is determined, Vbusref + Vstep3 obtained by adding the third margin for increase and the Bus voltage reference value of the optical storage system may be used as the Bus voltage reference value (Vbusbat) used by the battery control module.
Step S230: determining twice the third margin of increase as a fourth margin of increase;
in an embodiment of the present invention, the fourth margin for increase Vstep4 is a difference between a bus voltage reference value used by the grid control module and a bus voltage reference value of the light storage system, is a margin set for increasing the bus voltage reference value used by the grid control module, and is preset data, and needs to take a larger value, and preferably, the value of the fourth margin for increase Vstep4 is usually set to be 2 times of the value of the third margin for increase Vstep 3.
Step S240: and taking the sum of the fourth increase allowance and a bus voltage reference value of the light storage system as a bus voltage reference value used by the photovoltaic control module.
In the embodiment of the present invention, after the fourth margin for increase Vstep4 is determined, Vbusref + Vstep4 obtained by adding the fourth margin for increase and the Bus voltage reference value of the light storage system may be used as the Bus voltage reference value (Vbuspv) used by the battery control module.
Step S300: and taking the bus voltage reference value used by each module as a control loop input, and independently adjusting the power of each module in the optical storage system.
In the embodiment of the present invention, the optical storage system further includes a BOOST booster, a DC/AC (direct-current to alternating-current) converter, and a DC/DC (direct-current to direct-current) converter, when the power of the photovoltaic and the power of the load change, the bus voltage also changes, the bus voltage is simultaneously used as the control loop feedback signals of the battery control module (implemented by the DC/DC converter), the photovoltaic control module, and the DC/AC converter, and the bus voltage reference value corresponding to each module is used as the input signal of each control loop, so as to automatically adjust the bus voltage and the power supply state of the optical storage system, thereby independently adjusting the internal loops, that is, decoupling each module through the setting difference of the bus voltage.
Specifically, referring to fig. 5, it shows a sub-process of step S300 in fig. 2 according to an embodiment of the present invention, where the adjusting the bus voltage and the power supply state of the optical storage system includes:
step S310: when the power of the photovoltaic is less than the power of the load, controlling the bus voltage to maintain a bus voltage reference value used by the battery control module, and controlling the battery to supply power to the load through the DC/DC converter and the DC/AC converter;
in the embodiment of the invention, when the energy of the photovoltaic is small or no energy is available, the photovoltaic cannot inject enough energy into the bus, and at this time, the bus voltage is maintained at the bus voltage reference value vbusb used by the battery control module due to the control of the battery-side DC/DC converter, the battery is in a discharge state, and the load is supplied with power through the DC/AC converter.
Step S320: when the power of the photovoltaic is larger than the power of the load and the bus voltage is larger than a bus voltage reference value used by a battery control module, controlling the bus voltage to be maintained at the bus voltage reference value used by the battery control module and controlling the photovoltaic to supply power to the battery and the load through a bus;
in the embodiment of the present invention, when the energy of the photovoltaic is greater than the energy of the load, the photovoltaic injects energy into the bus, and when the bus voltage is greater than the bus voltage reference value vbusb used by the battery control module, the battery automatically changes to the charged state, the charging current increases, and the bus voltage does not continuously increase any more, so that the bus voltage is substantially stabilized near the bus voltage reference value vbusb used by the battery control module. When needing to explain, when the photovoltaic injects energy into the bus, the speed that the bus boosts needs to be controlled, namely, the energy is rapidly injected into the bus, and the bus is ensured not to be over-voltage, thereby realizing the effect of voltage stabilization.
Step S330: when the power of the photovoltaic is larger than the sum of the maximum powers of the load and the battery, and the bus voltage is larger than the bus voltage reference value used by the photovoltaic control module, controlling the bus voltage to be maintained at the bus voltage reference value used by the photovoltaic control module, and controlling the photovoltaic to supply power to the battery, the load and the power grid through a bus.
In the embodiment of the invention, the energy of the photovoltaic is particularly sufficient, and when the energy exceeds the sum of the maximum charging power of the load and the battery, the bus voltage continues to rise to the bus voltage reference value Vbus pv used by the photovoltaic control module, and the redundant energy is incorporated into the power grid through the DC/AC converter. The embodiment of the invention maintains the bus voltage to be near the bus voltage reference value used by the photovoltaic control module when the photovoltaic energy is sufficient, and also has the voltage stabilization effect. Meanwhile, Maximum Power Point Tracking (MPPT) of the photovoltaic can be performed all the time, and the voltage loop is only activated when the bus voltage exceeds the bus voltage reference value Vbuspv used by the photovoltaic control module.
In the power control method provided by the embodiment of the invention, because each module is provided with different bus reference values, and energy regulation is realized through the internal control loop of each module, the energy dispatching response rate is improved, the power of a load end can be quickly responded, no-load/full-load mutual switching within 100ms can be realized, and photovoltaic energy is preferentially utilized under any working condition. Meanwhile, the original program logic for calculating the power distribution control state of each module is simplified, the whole idea of the program is clearer and simpler, and the main work of controlling energy is transferred to the setting and selection of the bus reference value.
In some embodiments, please refer to fig. 6, which shows a flow of another power control method provided in an embodiment of the present invention, where the method further includes:
step S400: and when the backflow preventing working condition exists, taking the sum of the power of the load and the backflow preventing power as the power limiting value of the DC/AC converter.
In the embodiment of the invention, when the backflow preventing working condition exists, after the power of the load is obtained, only the power of the DC/AC converter is limited to the power of the load, and if the backflow preventing power is a specific value, the power value of the available load power plus the backflow preventing power is used as the power limiting value of the DC/AC converter.
Example two
An embodiment of the present invention provides a power control apparatus, which is characterized in that the power control apparatus is applied to a light storage system, modules in the system at least include a photovoltaic module, a battery, a power grid, and a load, please refer to fig. 7, which shows a structure of the power control apparatus provided in the embodiment of the present invention, where the power control apparatus 500 includes: a determination unit 510, a calculation unit 520 and an adjustment unit 530.
The determining unit 510 is configured to determine a bus voltage reference value of the light storage system according to the voltage data of the battery and the power grid.
The calculating unit 520 is configured to calculate a bus voltage reference value used by each module according to the bus voltage reference value of the optical storage system.
The adjusting unit 530 is configured to use the bus voltage reference value used by each module as a control loop input, and independently adjust the power of each module in the optical storage system.
In some embodiments, the determining unit 510 is further configured to obtain an average voltage value of the battery and a first margin of increase of a bus voltage reference value used by a battery control module; acquiring a voltage effective value of the power grid and a second increase allowance of a bus voltage reference value used by a power grid control module; and acquiring the sum of the average voltage value of the battery and the first increase allowance and the larger value between the voltage effective value of the power grid and the sum of the second increase allowance, and assigning the larger value to a bus voltage reference value of the light storage system.
In some embodiments, the determining unit 510 is further configured to collect several battery voltages in each grid cycle and calculate an average value to obtain an average voltage value of the battery; determining a product of the average voltage value and a first preset multiple as the first increase margin, wherein the first preset multiple is less than 1.
In some embodiments, the determining unit 510 is further configured to collect voltages of the grid side several times in a grid cycle, and calculate a voltage effective value of the grid by using the following formula:
Vgrid=[1/T*∫(0→T) vg(t) dt]1/2
wherein Vgrid represents a voltage effective value of the power grid, T represents a sampling period of the power grid, and vg (T) represents a voltage instantaneous value of the power grid; and determining the product of the voltage effective value of the power grid and a second preset multiple as the second increase allowance, wherein the second preset multiple is smaller than 1.
In some embodiments, the calculating unit 520 is further configured to determine a third margin for increase according to a bus voltage ripple and a loop response speed of the light storage system; the sum of the third increase allowance and a bus voltage reference value of the light storage system is used as a bus voltage reference value used by the battery control module; determining twice the third margin of increase as a fourth margin of increase; and taking the sum of the fourth increase allowance and a bus voltage reference value of the light storage system as a bus voltage reference value used by the photovoltaic control module.
In some embodiments, the light storage system further includes a DC/AC converter, and the adjusting unit 530 is further configured to, when the power of the photovoltaic and the power of the load change, use the bus voltage as a feedback signal of control loops of the battery control module, the photovoltaic control module, and the DC/AC converter, and use a bus voltage reference value corresponding to each module as an input signal of each control loop, so as to automatically adjust the bus voltage and the power supply state of the light storage system.
In some embodiments, the optical storage system further comprises a BOOST booster and a DC/DC converter, the regulating unit 530 is further configured to control the bus voltage to maintain a bus voltage reference value used by the battery control module and control the battery to supply power to the load through the DC/DC converter and the DC/AC converter when the power of the photovoltaic is less than the power of the load; when the power of the photovoltaic is larger than the power of the load and the bus voltage is larger than a bus voltage reference value used by a battery control module, controlling the bus voltage to be maintained at the bus voltage reference value used by the battery control module and controlling the photovoltaic to supply power to the battery and the load through a bus; when the power of the photovoltaic is larger than the sum of the maximum powers of the load and the battery, and the bus voltage is larger than the bus voltage reference value used by the photovoltaic control module, controlling the bus voltage to be maintained at the bus voltage reference value used by the photovoltaic control module, and controlling the photovoltaic to supply power to the battery, the load and the power grid through a bus.
In some embodiments, the adjusting unit 530 is further configured to use the sum of the power of the load and the backflow prevention power as the power limit value of the DC/AC converter when the backflow prevention condition exists.
EXAMPLE III
An embodiment of the present invention further provides a controller, please refer to fig. 8, which shows a hardware structure of a controller capable of executing the power control method described in fig. 2 to fig. 6.
The controller 10 includes: at least one processor 11; and a memory 12 communicatively connected to the at least one processor 11, one processor 11 being exemplified in fig. 8. The memory 12 stores instructions executable by the at least one processor 11, the instructions being executable by the at least one processor 11 to enable the at least one processor 11 to perform the power control method described above with reference to fig. 2-6. The processor 11 and the memory 12 may be connected by a bus or other means, and fig. 8 illustrates the connection by a bus as an example.
The memory 12, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as program instructions/modules corresponding to the power control method in the embodiment of the present application, for example, the respective modules shown in fig. 7. The processor 11 executes various functional applications of the server and data processing by running nonvolatile software programs, instructions and modules stored in the memory 12, namely, implements the power control method of the above-mentioned method embodiment.
The memory 12 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of the power control apparatus, and the like. Further, the memory 12 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, memory 12 may optionally include memory located remotely from processor 11, which may be connected to the power control device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory 12 and when executed by the one or more processors 11 perform the power control method in any of the method embodiments described above, e.g., perform the method steps of fig. 2-6 described above, implementing the functionality of the modules and units in fig. 7.
The product can execute the method provided by the embodiment of the application, and has the corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the methods provided in the embodiments of the present application.
Embodiments of the present application also provide a non-transitory computer-readable storage medium storing computer-executable instructions for execution by one or more processors, for example, to perform the method steps of fig. 2-6 described above to implement the functions of the modules in fig. 7.
Embodiments of the present application further provide a computer program product comprising a computer program stored on a non-volatile computer-readable storage medium, the computer program comprising program instructions that, when executed by a computer, cause the computer to perform the power control method in any of the above-described method embodiments, for example, to perform the method steps of fig. 2 to 6 described above, to implement the functions of the respective modules in fig. 7.
Example four
An embodiment of the present invention provides an optical storage system, which can be applied to the above application scenarios and the optical storage system shown in fig. 1, please refer to fig. 9, which shows a structure of the optical storage system provided in the embodiment of the present invention, where the optical storage system 100 includes: a photovoltaic PV, a BOOST booster, a DC/AC converter, a DC/DC converter, a battery BAT, a GRID, a LOAD, and a controller 10 according to the third embodiment, wherein the controller 10 is connected to the DC/AC converter and the DC/DC converter, respectively, the photovoltaic PV is connected to the DC/AC converter through the BOOST booster, the DC/AC converter is further connected to the GRID and the LOAD, respectively, the photovoltaic PV is further connected to the DC/DC converter through the BOOST booster, and the DC/DC converter is further connected to the battery BAT. It should be noted that thicker solid lines respectively connected between the photovoltaic PV and the DC/AC converter and the DC/DC converter through the BOOST booster represent the bus bars.
In the embodiment of the present invention, the power control method according to the first embodiment is executed by the controller 10, the power control apparatus according to the second embodiment is provided in the controller 10, and specifically, when the controller 10 executes the power control method, the voltage data of the battery BAT and the GRID are acquired through a sampling port arranged on the battery BAT or an external sampling module, then, after calculating the bus reference voltage values of the modules in the optical storage system 100, which are mainly used by the battery BAT and the GRID, and determining the power required by each module according to the bus reference voltage values of each module, the modules are decoupled through the setting difference of the bus voltage, and Pulse Width Modulation (PWM) signals are respectively output to the DC/AC converter and/or the DC/DC converter, so that the inner loop of each module is adjusted.
In the embodiment of the invention, the photovoltaic PV refers to a photovoltaic power generation system, and can directly convert solar radiation energy into electric energy by utilizing the photovoltaic effect of a photovoltaic cell; the DC/AC converter is a circuit module capable of converting a direct current power supply into an alternating current power supply; the DC/DC converter utilizes the energy storage characteristics of a capacitor and an inductor to perform high-frequency switching action through a controllable switch (such as a MOSFET (metal-oxide-semiconductor field effect transistor)) so as to realize a circuit module for boosting or reducing voltage; the battery BAT is an energy storage module and can store electric energy output by the photovoltaic PV, and preferably can be a battery with high energy density such as a lithium battery; the GRID is an integral body formed by a substation and a power transmission and distribution line of various voltages in an electric power system, and the system particularly refers to a single-phase alternating-current power GRID for transmitting and distributing electric energy and changing voltage; the LOAD LOAD is an electric device.
The embodiment of the invention provides a power control method, a device, a controller and an optical storage system, wherein modules in the system at least comprise a photovoltaic module, a battery, an electric network and a load, the method comprises the steps of firstly determining a bus voltage reference value of the optical storage system according to voltage data of the battery and the electric network, considering the overall working efficiency of the system, then calculating the bus voltage reference value used by each module according to the bus voltage reference value of the optical storage system, and independently adjusting the power of each module in the optical storage system by taking the bus voltage reference value used by each module as a control loop input, so that the response speed of energy scheduling is improved, and the control logic is simple.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a general hardware platform, and certainly can also be implemented by hardware. It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (11)

1. A power control method applied to a light storage system, wherein modules in the system at least comprise a photovoltaic, a battery, a power grid and a load, the method comprising:
determining a bus voltage reference value of the light storage system according to the voltage data of the battery and the power grid;
calculating a bus voltage reference value used by each module according to the bus voltage reference value of the optical storage system;
and taking the bus voltage reference value used by each module as a control loop input, and independently adjusting the power of each module in the optical storage system.
2. The power control method of claim 1,
the determining a bus voltage reference value of the light storage system according to the voltage data of the battery and the power grid comprises:
acquiring an average voltage value of the battery and a first increase allowance of a bus voltage reference value used by a battery control module;
acquiring a voltage effective value of the power grid and a second increase allowance of a bus voltage reference value used by a power grid control module;
and acquiring the sum of the average voltage value of the battery and the first increase allowance and the larger value between the voltage effective value of the power grid and the sum of the second increase allowance, and assigning the larger value to a bus voltage reference value of the light storage system.
3. The power control method of claim 2,
the acquiring the average voltage value of the battery and the first margin of increase of the bus voltage reference value used by the battery control module comprises:
collecting a plurality of battery voltages in each power grid period and calculating an average value to obtain an average voltage value of the battery;
determining a product of the average voltage value and a first preset multiple as the first increase margin, wherein the first preset multiple is less than 1.
4. The power control method of claim 2,
the obtaining of the second increase allowance of the voltage effective value of the power grid and the bus voltage reference value used by the power grid control module includes:
collecting the voltage of the power grid side for a plurality of times in the power grid period, and calculating the effective voltage value of the power grid through the following formula:
Vgrid=[1/T*∫(0→T) vg(t) dt]1/2
wherein Vgrid represents a voltage effective value of the power grid, T represents a period of the power grid, and vg (T) represents a voltage instantaneous value of the power grid;
and determining the product of the voltage effective value of the power grid and a second preset multiple as the second increase allowance, wherein the second preset multiple is smaller than 1.
5. The power control method according to any one of claims 1 to 4,
the calculating the bus voltage reference value used by each module according to the bus voltage reference value of the optical storage system includes:
determining a third increase allowance according to the bus voltage ripple and the loop response speed of the light storage system;
taking the sum of the third increase margin and a bus voltage reference value of the light storage system as a bus voltage reference value used by the battery control module;
determining twice the third margin of increase as a fourth margin of increase;
and taking the sum of the fourth increase allowance and a bus voltage reference value of the light storage system as a bus voltage reference value used by the photovoltaic control module.
6. The power control method of claim 5,
the light storage system further comprises a DC/AC converter,
the independently adjusting the power of each module in the optical storage system by taking the bus voltage reference value used by each module as the input of a control loop comprises:
and when the photovoltaic power and the load power are changed, the bus voltage is simultaneously used as control loop feedback signals of the battery control module, the photovoltaic control module and the DC/AC converter, and a bus voltage reference value corresponding to each module is used as an input signal of each control loop, so that the bus voltage and the power supply state of the light storage system are automatically adjusted.
7. The power control method of claim 6,
the optical storage system further comprises a BOOST booster and a DC/DC converter,
the adjusting the bus voltage and the power supply state of the light storage system comprises:
when the power of the photovoltaic is less than the power of the load, controlling the bus voltage to maintain a bus voltage reference value used by the battery control module, and controlling the battery to supply power to the load through the DC/DC converter and the DC/AC converter;
when the power of the photovoltaic is larger than the power of the load and the bus voltage is larger than a bus voltage reference value used by a battery control module, controlling the bus voltage to be maintained at the bus voltage reference value used by the battery control module and controlling the photovoltaic to supply power to the battery and the load through a bus;
when the power of the photovoltaic is larger than the sum of the maximum power of the load and the battery, and the bus voltage is larger than the bus voltage reference value used by the photovoltaic control module, controlling the bus voltage to be maintained at the bus voltage reference value used by the photovoltaic control module, and controlling the photovoltaic to supply power to the battery, the load and the power grid through a bus.
8. The power control method of claim 7, further comprising:
and when the backflow preventing working condition exists, taking the sum of the power of the load and the backflow preventing power as the power limiting value of the DC/AC converter.
9. A power control device for a light storage system, wherein modules in the system include at least a photovoltaic, a battery, a power grid and a load, the device comprising:
the determining unit is used for determining a bus voltage reference value of the light storage system according to the voltage data of the battery and the power grid;
the calculation unit is used for calculating the bus voltage reference value used by each module according to the bus voltage reference value of the optical storage system;
and the adjusting unit is used for taking the bus voltage reference value used by each module as the input of a control loop and independently adjusting the power of each module in the optical storage system.
10. A controller, comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-8.
11. A light storage system, comprising: photovoltaic, BOOST booster, DC/AC converter, DC/DC converter, battery, grid, load, and controller as claimed in claim 10,
the controller is connected with the DC/AC converter and the DC/DC converter respectively,
the photovoltaic is connected with the DC/AC converter through a BOOST booster, the DC/AC converter is further respectively connected with the power grid and the load, the photovoltaic is further connected with the DC/DC converter through the BOOST booster, and the DC/DC converter is further connected with the battery.
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