CN114513013A - Energy scheduling method, device, control equipment and storage medium - Google Patents

Energy scheduling method, device, control equipment and storage medium Download PDF

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Publication number
CN114513013A
CN114513013A CN202111321019.2A CN202111321019A CN114513013A CN 114513013 A CN114513013 A CN 114513013A CN 202111321019 A CN202111321019 A CN 202111321019A CN 114513013 A CN114513013 A CN 114513013A
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China
Prior art keywords
power
energy storage
storage battery
charging
difference value
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CN202111321019.2A
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Chinese (zh)
Inventor
高凡
宫芳涛
贺王斌
胡兆伟
刘铜强
张克闯
郭军涛
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Longi Solar Technology Co Ltd
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Longi Solar Technology Co Ltd
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Priority to CN202111321019.2A priority Critical patent/CN114513013A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—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
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
    • H02J3/144—Demand-response operation of the power transmission or distribution network
    • 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
    • H02J3/28—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
    • H02J3/322—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
    • 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
    • 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
    • H02J7/34—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
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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
    • 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
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/50—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads
    • H02J2310/56—The network for supplying or distributing electric power characterised by its spatial reach or by the load for selectively controlling the operation of the loads characterised by the condition upon which the selective controlling is based
    • H02J2310/58—The condition being electrical
    • H02J2310/60—Limiting power consumption in the network or in one section of the network, e.g. load shedding or peak shaving

Abstract

The invention provides an energy scheduling method, an energy scheduling device, control equipment and a storage medium, and relates to the technical field of photovoltaic, wherein the method comprises the following steps: under the condition that the charging pile is started, the current operating power of the charging pile is obtained, a first power difference value between the upper limit of the operating power of the charging pile and the current operating power is obtained, and under the condition that the output power of the public connection point of the power grid is smaller than or equal to the first power difference value, if the energy storage battery is in a charging or standby state, the output power and/or the charging power of the energy storage battery is reduced, and the current operating power is increased. When the PCC is in output state, increase the current operating power who fills electric pile, reduce energy storage battery's charging power, can reduce energy storage battery's charge-discharge number of times, prolong energy storage battery's life to can reduce photovoltaic energy storage charging system's running cost.

Description

Energy scheduling method, device, control equipment and storage medium
Technical Field
The invention relates to the technical field of photovoltaic, in particular to an energy scheduling method, an energy scheduling device, control equipment and a storage medium.
Background
The photovoltaic energy storage charging system generally includes a control device, a photovoltaic module, an energy storage battery, and a load, where the control device is connected to the energy storage battery, the photovoltaic module, and the load, respectively, and is connected to a Point of Common Coupling (PCC) of a power grid. The control equipment can schedule the power among the energy storage battery, the power grid and the load according to the power generation power of the photovoltaic module, the load power of the load and the charge-discharge power of the energy storage battery, so that the power in the energy storage system is kept balanced.
Along with the development of new forms of energy technique, more and more fill electric pile and be inserted photovoltaic energy storage charging system, because it is random to fill electric pile start or stop, the access of filling electric pile can increase photovoltaic energy storage charging system's running cost.
Disclosure of Invention
The invention provides an energy scheduling method, an energy scheduling device, control equipment and a storage medium, and aims to solve the problem that the operation cost is increased after a photovoltaic energy storage charging system is connected to a charging pile.
The first aspect of the embodiment of the invention provides an energy scheduling method, which is applied to control equipment in a photovoltaic energy storage charging system, wherein the photovoltaic energy storage charging system further comprises a charging pile and an energy storage battery, and the control equipment is respectively connected with the charging pile, the energy storage battery and a public connection point of a power grid; the method comprises the following steps:
under the condition that the charging pile is started, acquiring the current operating power of the charging pile;
acquiring a first power difference value between the upper operating power limit of the charging pile and the current operating power;
under the condition that the output power of the grid public connection point does not exceed the first power difference value, if the energy storage battery is in a charging or standby state, reducing the output power and/or the charging power of the energy storage battery, and increasing the current operation power;
wherein the increased current operating power is less than or equal to the operating power upper limit.
Optionally, the method further comprises:
under the condition that the output power does not exceed the first power difference value, if the energy storage battery is in a discharging state, reducing the output power to 0, and increasing the current operation power by the output power;
reducing the output power and increasing the current operating power when the output power is greater than the first power difference;
wherein the increased current operating power is less than or equal to the operating power upper limit.
Optionally, the reducing the output power and/or the charging power of the energy storage battery and increasing the current operating power includes:
obtaining a first power sum of the charging power and the output power;
adjusting the output power to 0 and decreasing the charging power and increasing the current operating power to the operating power upper limit if the first power sum is greater than the first power difference;
and reducing the output power and the charging power to 0 and increasing the current operation power by the first power sum if the first power sum is less than or equal to the first power difference.
Optionally, the method further comprises:
acquiring a second power difference value between the lower operating power limit of the charging pile and the current operating power;
reducing the current operating power and the input power by the same magnitude when the input power of the grid point of common connection is greater than the second power difference;
wherein the reduced current operating power is not lower than the operating power lower limit.
Optionally, the method further comprises:
and under the condition that the input power is smaller than or equal to the second power difference value, if the energy storage battery is in a charging state, adjusting the input power to be 0, and reducing the current operation power by the input power.
Under the condition that the input power is smaller than or equal to the second power difference value, if the energy storage battery is in a discharging or standby state, reducing the input power and/or the discharging power of the energy storage battery, and reducing the current operation power;
wherein the reduced current operating power is not lower than the operating power lower limit.
Optionally, the reducing the input power and/or the discharge power of the energy storage battery and reducing the current operating power includes:
acquiring a second power sum of the input power and the discharge power;
reducing the input power to 0 and the discharge power and the current operating power to the operating power lower limit if the second power sum is greater than the second power difference;
and reducing the input power and the discharge power to 0 and reducing the current operation power by the second power sum when the second power sum is less than or equal to the second power difference.
Optionally, the method further comprises:
under the condition that the power of the public connection point of the power grid is 0, if the energy storage battery is in a discharging or standby state, reducing the current running power and the discharging power of the energy storage battery by the same amplitude; the reduced current operating power is not lower than the lower limit of the operating power of the charging pile;
under the condition that the power of the public connection point of the power grid is 0, if the energy storage battery is in a charging state, reducing the charging power of the energy storage battery and increasing the current operation power;
wherein the increased current operating power is not higher than the operating power upper limit.
The second aspect of the embodiment of the present invention provides another energy scheduling method, which is applied to a control device in a photovoltaic energy storage charging system, where the photovoltaic energy storage charging system further includes a charging pile, an energy storage battery, and a load that can be turned off, and the control device is connected to the charging pile, the energy storage battery, and the load that can be turned off, respectively; the method further comprises the following steps:
under the condition that the charging pile is started, closing the turn-off load, and acquiring the current operating power of the charging pile and the load power of the turn-off load;
obtaining a third power difference value between the load power and the current operation power;
keeping the current operation power unchanged, and adjusting the charging and discharging power of the energy storage battery based on the third power difference value so as to keep the power balance of the photovoltaic energy storage charging system.
Optionally, the adjusting the charging and discharging power of the energy storage battery based on the third power difference includes:
under the condition that the current running power is smaller than or equal to the load power, if the energy storage battery is in a discharging state, reducing the discharging power of the energy storage battery by the third power difference;
under the condition that the current running power is smaller than or equal to the load power, if the energy storage battery is in a standby state, controlling the energy storage battery to be charged at a charging power which is not higher than the third power difference value;
and under the condition that the current running power is less than or equal to the load power, if the energy storage battery is in a charging state, increasing the charging power of the energy storage battery by the third power difference.
Optionally, the adjusting the charging and discharging power of the energy storage battery based on the third power difference includes:
under the condition that the current running power is larger than the load power, if the energy storage battery is in a discharging state or a standby state, obtaining discharging redundant power of the energy storage battery;
increasing the discharging power of the energy storage battery by the third power difference value when the discharging redundant power is greater than or equal to the third power difference value;
under the condition that the discharge redundant power is smaller than the third power difference value, controlling the energy storage battery to discharge at the maximum discharge power, and controlling the input power of the public connection point of the power grid to increase by a first power value; the first power value is a difference between the discharge redundancy power and the third power difference.
Optionally, the adjusting the charging and discharging power of the energy storage battery based on the third power difference includes:
under the condition that the current running power is larger than the load power, if the energy storage battery is in a charging state, determining the maximum power reduction amplitude of the charging power of the energy storage battery;
reducing the charging power by the third power difference value when the maximum power reduction is greater than or equal to the third power difference value;
under the condition that the maximum power reduction amplitude is smaller than the third power difference value, if the energy storage battery can be discharged based on the battery charge state value of the energy storage battery, the energy storage battery is converted into a discharge state, and a fourth power difference value between the maximum power reduction amplitude and the third power difference value is obtained;
under the condition that the maximum discharge power of the energy storage battery is greater than or equal to the fourth power difference value, controlling the energy storage battery to discharge at the fourth power difference value;
under the condition that the maximum discharge power is smaller than the fourth power difference value, controlling the energy storage battery to discharge at the maximum discharge power, and controlling the input power of the public connection point of the power grid to increase by a second power value; the second power value is a difference between the fourth power difference and the maximum discharge power.
A third aspect of the embodiments of the present invention provides another energy scheduling method, which is applied to a control device in a photovoltaic energy storage charging system, and is applied to a control device in a photovoltaic energy storage charging system, where the method includes:
in the event that a first input is received, performing the method of the first aspect in response to the first input;
in case a second input is received, the method according to the second aspect is performed in response to the second input.
The fourth aspect of the embodiments of the present invention provides an energy scheduling, which is arranged in a control device in a photovoltaic energy storage charging system, where the photovoltaic energy storage charging system further includes a charging pile and an energy storage battery, the control device is connected to the charging pile and the energy storage battery, respectively, and the control device is further connected to a public connection point of a power grid; the device comprises:
the first acquisition module is used for acquiring the current operating power of the charging pile under the condition that the charging pile is started;
the second acquisition module is used for acquiring a first power difference value between the upper operating power limit of the charging pile and the current operating power;
the control module is used for reducing the output power and/or the charging power of the energy storage battery and increasing the current operation power if the energy storage battery is in a charging or standby state under the condition that the output power of the public connection point of the power grid is smaller than or equal to the first power difference value;
wherein the increased current operating power is less than or equal to the operating power upper limit.
Optionally, the control module is further configured to reduce the output power to 0 and increase the current operating power by the output power if the energy storage battery is in a discharge state under the condition that the output power does not exceed the first power difference; reducing the output power and increasing the current operating power when the output power is greater than the first power difference;
wherein the increased current operating power is less than or equal to the operating power upper limit.
Optionally, the control module is specifically configured to obtain a first power sum of the charging power and the output power; adjusting the output power to 0 and decreasing the charging power and increasing the current operating power to the operating power upper limit if the first power sum is greater than the first power difference; and reducing the output power and the charging power to 0 and increasing the current operation power by the first power sum if the first power sum is less than or equal to the first power difference.
Optionally, the control module is further configured to obtain a second power difference between the lower operating power limit of the charging pile and the current operating power; reducing the current operating power and the input power by the same magnitude when the input power of the grid point of common connection is greater than the second power difference; wherein the reduced current operating power is not lower than the operating power lower limit.
Optionally, the control module is further configured to, when the input power is less than or equal to the second power difference, adjust the input power to 0 and reduce the current operating power by the input power if the energy storage battery is in a charging state. Under the condition that the input power is smaller than or equal to the second power difference value, if the energy storage battery is in a discharging or standby state, reducing the input power and/or the discharging power of the energy storage battery, and reducing the current operation power; wherein the reduced current operating power is not lower than the operating power lower limit.
Optionally, the control module is specifically configured to obtain a second power sum of the input power and the discharge power; reducing the input power to 0 and the discharge power and the current operating power to the operating power lower limit if the second power sum is greater than the second power difference; and reducing the input power and the discharge power to 0 and reducing the current operation power by the second power sum when the second power sum is less than or equal to the second power difference.
Optionally, the control module is specifically configured to, when the power of the grid public connection point is 0, reduce the current operating power and the discharge power of the energy storage battery by the same magnitude if the energy storage battery is in a discharge or standby state; the reduced current operating power is not lower than the lower limit of the operating power of the charging pile; under the condition that the power of the public connection point of the power grid is 0, if the energy storage battery is in a charging state, reducing the charging power of the energy storage battery and increasing the current operation power; wherein the increased current operating power is not higher than the operating power upper limit.
A fifth aspect of the embodiments of the present invention provides another energy scheduling, where the another energy scheduling is arranged in a control device in a photovoltaic energy storage charging system, where the photovoltaic energy storage charging system further includes a charging pile, an energy storage battery, and a load that can be turned off, and the control device is connected to the charging pile, the energy storage battery, and the load that can be turned off, respectively; the device comprises:
the first acquisition module is used for closing the turn-off load under the condition that the charging pile is started, and acquiring the current operating power of the charging pile and the load power of the turn-off load;
the second obtaining module is used for obtaining a third power difference value between the load power and the current operation power;
and the control module is used for keeping the current running power unchanged and adjusting the charging and discharging power of the energy storage battery based on the third power difference value so as to keep the power balance of the photovoltaic energy storage and charging system.
Optionally, the control module is specifically configured to, when the current operating power is less than or equal to the load power, reduce the discharging power of the energy storage battery by the third power difference if the energy storage battery is in a discharging state; under the condition that the current running power is smaller than or equal to the load power, if the energy storage battery is in a standby state, controlling the energy storage battery to be charged at a charging power which is not higher than the third power difference value; and under the condition that the current running power is less than or equal to the load power, if the energy storage battery is in a charging state, increasing the charging power of the energy storage battery by the third power difference.
Optionally, the control device is connected with a grid public connection point; the control module is specifically configured to, under the condition that the current operating power is greater than the load power, obtain a discharging redundant power of the energy storage battery if the energy storage battery is in a discharging state or a standby state; increasing the discharging power of the energy storage battery by the third power difference value when the discharging redundant power is greater than or equal to the third power difference value; under the condition that the discharge redundant power is smaller than the third power difference value, controlling the energy storage battery to discharge at the maximum discharge power, and controlling the input power of the public connection point of the power grid to increase by a first power value; the first power value is a difference between the discharge redundancy power and the third power difference.
Optionally, the control device is connected with a grid public connection point; the control module is specifically configured to determine a maximum power reduction of the charging power of the energy storage battery if the energy storage battery is in a charging state under the condition that the current operating power is greater than the load power; reducing the charging power by the third power difference value when the maximum power reduction is greater than or equal to the third power difference value; under the condition that the maximum power reduction amplitude is smaller than the third power difference value, if the energy storage battery can be discharged based on the battery charge state value of the energy storage battery, the energy storage battery is converted into a discharge state, and a fourth power difference value between the maximum power reduction amplitude and the third power difference value is obtained; under the condition that the maximum discharge power of the energy storage battery is greater than or equal to the fourth power difference value, controlling the energy storage battery to discharge at the fourth power difference value; under the condition that the maximum discharge power is smaller than the fourth power difference value, controlling the energy storage battery to discharge at the maximum discharge power, and controlling the input power of the public connection point of the power grid to increase by a second power value; the second power value is a difference between the fourth power difference and the maximum discharge power.
A sixth aspect of embodiments of the present invention provides a control device, which includes a processor, a memory, and a program or instructions stored on the memory and executable on the processor, and when executed by the processor, the program or instructions implement the steps of the energy scheduling method according to the first aspect, the second aspect, or the third aspect.
A seventh aspect of embodiments of the present invention provides a readable storage medium, on which a program or instructions are stored, which when executed by a processor implement the steps of the energy scheduling method according to the first, second or third aspect.
In the embodiment of the invention, under the condition that the charging pile is started, the current operating power of the charging pile is obtained, the first power difference value between the upper limit of the operating power of the charging pile and the current operating power is obtained, and under the condition that the output power of the public connection point of the power grid is less than or equal to the first power difference value, if the energy storage battery is in a charging or standby state, the output power and/or the charging power of the energy storage battery is reduced, and the current operating power is increased. When the PCC is in output state, increase the current operating power who fills electric pile, reduce energy storage battery's charging power, can reduce energy storage battery's charge-discharge number of times, prolong energy storage battery's life to can reduce photovoltaic energy storage charging system's running cost.
Drawings
In order to more clearly describe the technical solution of the embodiment of the present invention, the drawings needed to be used in the description of the embodiment of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a flow chart illustrating the steps of a method of energy scheduling in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a photovoltaic energy storage and charging system according to an embodiment of the present invention;
fig. 3 is a flow chart illustrating an energy scheduling method according to an embodiment of the present invention;
FIG. 4 is a flow chart illustrating the steps of another energy scheduling method in an embodiment of the present invention;
fig. 5 is a flow chart illustrating a control method of an energy storage battery according to an embodiment of the invention;
fig. 6 shows a schematic flow chart of another method for controlling an energy storage battery according to an embodiment of the invention;
fig. 7 is a flow chart illustrating a control method of an energy storage battery according to another embodiment of the present invention;
FIG. 8 is a flow chart illustrating the steps of another energy scheduling method in an embodiment of the present invention;
fig. 9 is a schematic structural diagram illustrating an energy scheduling apparatus according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram illustrating an energy scheduling apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The energy scheduling method provided by the embodiment of the present application is described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
Referring to fig. 1, a flowchart of steps of an energy scheduling method in an embodiment of the present invention is shown, where the method is applied to a control device in a photovoltaic energy storage charging system, the photovoltaic energy storage charging system further includes a charging pile and an energy storage battery, and the control device is respectively connected to the charging pile, the energy storage battery, and a power grid public connection point; the method comprises the following steps:
step 101, acquiring the current operating power of the charging pile under the condition of starting the charging pile.
The energy scheduling method may be implemented by a control device in the photovoltaic energy storage charging system, for example, a light storage inverter (Hybrid) in the photovoltaic energy storage charging system. As shown in fig. 2, fig. 2 shows a schematic structural diagram of a photovoltaic energy storage charging system in an embodiment of the present invention, the photovoltaic energy storage charging system includes a control device 201, a photovoltaic module 202, an energy storage battery 203, an important load 204, and a turn-off load 205, and the photovoltaic energy storage charging system also includes a charging pile 206. The control equipment is respectively connected with the photovoltaic module, the energy storage battery, the important load, the turn-off load and the charging pile, and meanwhile, the control equipment is also connected with a public connection point 207 of a power grid in the power grid. The important load comprises one or more electric devices, and the important load cannot be powered off in the using process; the turn-off load comprises one or more powered devices, and the turn-off load may be powered down during use. The photovoltaic module can generate electricity under the illumination condition, so that electric energy is provided for the whole photovoltaic energy storage and charging system, and the energy storage battery can store redundant electric energy in the photovoltaic energy storage and charging system. The control equipment is connected with the PCC, when the electric energy in the photovoltaic energy storage charging system is insufficient, the control equipment can acquire the electric energy from the power grid through the PCC to supplement the electric energy for the photovoltaic energy storage charging system, otherwise, when the electric energy in the photovoltaic energy storage charging system is sufficient, the surplus electric energy in the photovoltaic energy storage charging system can be transmitted to the power grid through the PCC. Fill electric pile and be used for charging for the consumer, the consumer for example electric automobile fills electric pile and is connected with the consumer, after starting to charge, with the electric energy transport for the consumer in the photovoltaic energy storage charging system. The control device can schedule electric energy among the photovoltaic module, the energy storage battery, the important load, the charging pile, the turn-off load and the power grid. The specific structure of the photovoltaic energy storage charging system can be set according to the requirement, and the embodiment does not limit the structure.
In this embodiment, the control device is connected with the charging pile, and can monitor the state of the charging pile, and after the charging pile is monitored to start charging, the current operating power of the charging pile is obtained, where the current operating power is the actual current operating power of the charging pile in the process of transmitting electric energy to the electric vehicle, and the current operating power may be represented by a symbol Pev. For example, the charging pile can charge the electric equipment according to preset current operating power, and after the charging pile is started, the current operating power can be sent to the control equipment. The specific method for acquiring the current operating power may be set according to the requirement, and this embodiment does not limit this.
102, obtaining a first power difference value between the upper limit of the operating power of the charging pile and the current operating power.
In an embodiment, the control device may obtain a first power difference between an upper operating power limit of the charging pile and a current operating power when detecting that the PCC is in the output state. The output state indicates that redundant electric energy exists in the photovoltaic energy storage charging system, the photovoltaic energy storage charging system outputs the electric energy to a power grid through a PCC, when the control device detects that the power of the PCC is larger than 0, the control device determines that the redundant electric energy is transmitted to the power grid through the PCC, the power of the PCC at the moment is output power, and the output power of the PCC can be represented by a symbol Ppcc 1. The upper limit of the operating power is the maximum power which can be operated by the charging pile, and the upper limit of the operating power can be represented by a symbol Pevmax. The control device may obtain the upper limit of the operating power of the charging pile in advance, or send a power obtaining request to the charging pile after determining that the charging pile is started, so as to obtain the upper limit of the operating power of the charging pile. After the upper limit of the operating power is obtained, the control device may calculate a difference between the upper limit of the operating power and the current operating power of the charging pile to obtain a first power difference, where the first power difference is (Pevmax-Pev). The first power difference value represents the power which can be increased at the current moment of the charging pile, namely the power which can be consumed by the photovoltaic energy storage charging system can be increased at present.
And 103, under the condition that the output power of the public connection point of the power grid does not exceed the first power difference, if the energy storage battery is in a charging or standby state, reducing the output power and/or the charging power of the energy storage battery, and increasing the current operation power.
Wherein the increased current operating power is less than or equal to the upper operating power limit. The sum of the reduction amplitude of the output power and the reduction amplitude of the charging power and the increase amplitude of the current operation power can be the same, so that the power balance of the photovoltaic energy storage system is kept. When the energy storage battery is in a charging state, the photovoltaic energy storage charging system charges the energy storage battery, and the charging power of the energy storage battery can be represented by a symbol Pbat 1. When the energy storage battery is in a standby state, the energy storage battery is not charged or discharged, and the charging power and the discharging power of the energy storage battery are both 0. When the energy storage battery is in a discharging state, the energy storage battery provides electric energy for the photovoltaic energy storage charging system, and the discharging power of the energy storage battery can be represented by a symbol Pbat 2.
In this embodiment, the control device obtains the output power of the PCC when determining that the PCC is in the output state. Meanwhile, the control device may compare the output power of the PCC with the first power difference, and when the output power of the PCC is less than or equal to the first power difference, that is, Ppcc1 is less than or equal to Pevmax-Pev, it indicates that the power transmitted to the power grid through the PCC may be transferred to the charging pile, that is, the electric energy output through the PCC may be transferred to the electric equipment connected to the charging pile. After determining that Ppsc 1 is less than or equal to Pevmax-Pev, determining the state of the energy storage battery, determining that the photovoltaic energy storage charging system is outputting electric energy to the power grid when determining that the energy storage battery is in a standby state, and determining that the photovoltaic energy storage charging system is outputting electric energy to the power grid and simultaneously charging the energy storage battery when determining that the energy storage battery is in a charging state.
The control device may reduce the charging power of the energy storage battery and/or reduce the output power of the PCC when it is determined that the output power of the PCC is less than or equal to the first power difference and the energy storage battery is in the charging state. For example, when Ppcc1 is equal to (Pevmax-Pev), the output power of the PCC may be reduced (Pevmax-Pev), that is, the output power of the PCC is reduced to 0, so that the photovoltaic energy storage charging system does not output electric energy to the grid, and the current operating power of the charging pile may be increased (Pevmax-Pev), that is, the current operating power of the charging pile is increased to an upper operating power limit, so as to maintain the power balance of the photovoltaic energy storage charging system. When Ppcc1 < (Pevmax-Pev), the output power of the PCC can be reduced by a1, the charging power of the energy storage battery can be reduced by a2, and the current operating power of the charging pile can be increased by A3, a1+ a2 is A3, so as to maintain the power balance of the photovoltaic energy storage charging system, and meanwhile, the increased current operating power is controlled to be less than or equal to Pevmax, so that the current operating power of the charging pile is prevented from exceeding the rated maximum power. Or when Ppsc 1 < (Pevmax-Pev), the output power of the PCC is kept unchanged, the charging power of the energy storage battery is reduced by A2, the current operation power of the charging pile is increased by A3, and A2 is A3, so that the power balance of the photovoltaic energy storage charging system is kept, and meanwhile, the increased current operation power is controlled to be smaller than or equal to Pevmax. The specific values of a1, a2, and A3 may be set according to the demand, the charging power and/or the output power of the energy storage battery may be reduced, and the method of increasing the current operating power may include, but is not limited to, the above examples.
Under the condition that the output power of the grid public connection point is smaller than or equal to the first power difference value, if the energy storage battery is in a standby state, the state of the energy storage battery can be kept unchanged, the output power of the PCC is reduced, and the current operation power of the charging pile is increased.
Optionally, the method may further include:
under the condition that the output power does not exceed the first power difference value, if the energy storage battery is in a discharging state, reducing the output power to 0, and increasing the current operation power by the output power;
when the output power is larger than the first power difference value, reducing the output power and increasing the current operation power;
wherein the increased current operating power is less than or equal to the upper operating power limit. The reduction amplitude of the output power and the increase amplitude of the current operation power can be the same so as to keep the power balance of the photovoltaic energy storage system.
As shown in fig. 3, fig. 3 is a flowchart illustrating an energy scheduling method in an embodiment of the present invention, and when determining that the PCC is in an output state, the control device may obtain output power Ppcc1 or input power Ppcc2 of the PCC, and obtain current operating power Pev of the charging pile, charging power Pbat1 of the energy storage battery, or discharging power Pbat2 of the charging pile. When the PCC point is in an output state and Ppcc1 is greater than 0, the control device may compare the output power of the PCC with a first power difference value, and when the output power of the PCC is less than or equal to the first power difference value, that is, Ppcc1 is less than or equal to Pevmax-Pev, it indicates that the power transmitted to the power grid through the PCC may be transferred to the charging pile, that is, the electric energy output through the PCC is transferred to the electric device connected to the charging pile. After determining Ppsc 1 ≦ Pevmax-Pev, the state of the energy storage battery may be further determined. When the output power is less than or equal to the first power difference value and the energy storage battery is in a discharging or standby state, the control device may reduce the output power of the PCC to 0, and increase the current operating power of the charging pile by Ppcc1, so as to maintain the power balance of the photovoltaic energy storage charging system. In the operation process of the photovoltaic energy storage charging system, the output power of the PCC is reduced, the current operation power of the charging pile is improved, and the requirement of a user for quick charging can be met.
In an embodiment, when the output power of the PCC is greater than the first power difference value, the control device may decrease the output power of the PCC and increase the current operating power of the charging pile. When the Ppcc1 is determined to be more than Pevmax-Pev, the control device can reduce the output power of the PCC and increase the current operating power of the charging pile, wherein when the current operating power is increased by X, and the output power is reduced by X, the increased current operating power of the charging pile is (Pev + X), and the reduced output power of the PCC is (Ppcc 1-X). As shown in fig. 3, the current operating power of the charging pile may be increased to the upper operating power limit, so that the charging pile operates at the upper operating power limit, where the current operating power of the charging pile is Pevmax, and the output power of the PCC is Ppcc1- (Pevmax-Pev). When the output power of the PCC is larger than the first power difference value, the output power of the PCC is reduced based on the power sum of the charging power and the output power, the current operation power of the charging pile is increased, and the requirement of a user for quick charging can be met.
Alternatively, the step of reducing the charging power and/or the output power of the energy storage battery and increasing the current operating power may be implemented as follows:
acquiring a first power sum of charging power and output power;
under the condition that the first power sum is larger than the first power difference, adjusting the output power to be 0, reducing the charging power, and increasing the current operation power to the operation power upper limit;
and reducing the output power and the charging power to 0 and increasing the current operation power by the first power sum when the first power sum is less than or equal to the first power difference.
In one embodiment, control may first calculate a first power sum, i.e., Pbat1+ Ppcc1, between the charging power of the energy storage battery and the output power of the PCC when it is determined that the output power of the PCC is less than or equal to the first power difference and the energy storage battery is in the charging or standby state.
As shown in fig. 3, when the first power sum is greater than the first power difference value, that is, (Ppcc1+ Pbat1) > (Pevmax-Pev), the output power of the PCC is reduced to 0, the current operation power of the charging pile is increased to Pevmax, and the charging power of the energy storage battery is reduced, wherein the reduction range of the charging power of the energy storage battery is (Pevmax-Pev-Ppcc1), so as to maintain the power balance of the photovoltaic energy storage charging system. Correspondingly, when the first power sum is smaller than or equal to the first power difference value, namely (Ppcc1+ Pbat1) ≦ Pevmax-Pev, the output power of the PCC is reduced to 0, the charging power of the energy storage battery is reduced to 0, and meanwhile the current operation power of the charging pile is increased, and the current operation power of the charging pile is increased by (Ppcc1+ Pbat 1).
In the embodiment of the invention, when the output power of the PCC is less than or equal to the first power difference value, the current operation power of the charging pile is increased based on the power sum of the charging power and the output power, the output power of the PCC is reduced to 0, and the charging power of the energy storage battery is reduced, or the output power of the PCC and the charging power of the energy storage battery are both reduced to 0, and the current operation power of the charging pile is increased, so that the charging pile can rapidly charge the electric equipment, the requirement of a user on rapid charging is met, and the service life of the energy storage battery can be prolonged when the charging and discharging times of the energy storage battery are reduced.
When the output power of the public connection point of the power grid is smaller than or equal to the first power difference value, if the energy storage battery is in a standby state, the state of the energy storage battery can be kept unchanged, so that the charging and discharging times of the energy storage battery are reduced.
In summary, in the embodiment of the present invention, when the charging pile is started, the current operating power of the charging pile is obtained, the first power difference between the upper limit of the operating power of the charging pile and the current operating power is obtained, and when the output power of the grid public connection point is less than or equal to the first power difference, if the energy storage battery is in a charging or standby state, the output power and/or the charging power of the energy storage battery is reduced, and the current operating power is increased. When the PCC is in output state, increase the current operating power who fills electric pile, reduce energy storage battery's charging power, can reduce energy storage battery's charge-discharge number of times, prolong energy storage battery's life to can reduce photovoltaic energy storage charging system's running cost. Meanwhile, the current operating power of the charging pile is increased, and the requirement of a user for quick charging can be met.
Optionally, the method may further include:
acquiring a second power difference value between the lower limit of the operating power of the charging pile and the current operating power;
reducing the current operating power and the input power by the same amplitude under the condition that the input power of the public connection point of the power grid is greater than the second power difference value;
and the reduced current running power is not lower than the lower limit of the running power. When the PCC is in an input state, the electric energy in the photovoltaic energy storage charging system is insufficient, and the photovoltaic energy storage charging system obtains the electric energy from a power grid through the PCC. The lower limit of the operating power is the lowest power which can be operated by the charging pile, and the lower limit of the operating power can be represented by a symbol Pevmin. The control device may acquire the lower operating power limit of the charging pile in advance, or may send a power acquisition request to the charging pile after determining that the charging pile is started, so as to acquire the lower operating power limit of the charging pile.
In this embodiment, the control device may obtain a second power difference between the lower limit of the operating power of the charging pile and the current operating power when detecting that the PCC is in the input state. After detecting and determining that the charging pile is started, the control device may further detect and determine a state of the PCC, and when detecting and determining that the power of the PCC is less than 0, may determine that the photovoltaic energy storage charging system is obtaining electric energy from the grid through the PCC, the power of the PCC at this time is an input power, and the input power of the PCC may be represented by a symbol Ppcc 2. At this time, the control device may calculate a difference between the lower operating power limit and the current operating power of the charging pile to obtain a second power difference, where the second power difference is (Pev-Pevmin). The second power difference value represents the power that can be reduced at the present moment of charging pile, that is, the power that can be reduced by the photovoltaic energy storage charging system at present. Further, the control device may reduce the current operating power of the charging pile and the input power of the PCC by the same magnitude when the input power of the PCC is greater than the second power difference. For example, X can be reduced simultaneously with the current operating power of filling electric pile and the input power of PCC, and the concrete numerical value of X can be set up according to the demand, and it can to guarantee that the current operating power after the reduction is not less than the operating power lower limit.
As shown in fig. 3, when the input power of the grid public connection point is greater than the second power difference value, that is, Ppcc2 is greater than Pev-Pevmin, the current operating power of the charging pile may be reduced to the lower operating power limit, that is, the current operating power of the charging pile at the current time is adjusted to Pevmin, and the input power of the PCC point is reduced, and the reduction range of the input power of the PCC is Pev-Pevmin. Note that, when the PCC is in the input state, the input power is generally a negative value, and the input power Ppcc2 in this embodiment represents an absolute value of the input power.
In the embodiment of the invention, when the public connection point of the power grid is in an input state, the current operation power of the charging pile is reduced based on the power difference between the lower limit of the operation power of the charging pile and the current operation power, the input power of the PCC is reduced, the electric quantity obtained from the power grid can be reduced, and therefore the operation cost of the photovoltaic energy storage charging system can be reduced. When the input power of the PCC is reduced by the second power difference, the electric energy obtained from the power grid can be reduced to the maximum extent, and the cost is reduced to the maximum extent.
Optionally, the method may further include:
and under the condition that the input power is less than or equal to the second power difference, if the energy storage battery is in a charging state, adjusting the input power to be 0, and reducing the current operation power by the input power.
Under the condition that the input power is smaller than or equal to the second power difference value, if the energy storage battery is in a discharging or standby state, reducing the input power and/or the discharging power of the energy storage battery, and reducing the current operation power;
and the reduced current running power is not lower than the lower limit of the running power. The sum of the reduction amplitude of the input power and the reduction amplitude of the discharge power and the reduction amplitude of the current operation power can be the same so as to keep the power balance of the photovoltaic energy storage system.
In this embodiment, if the PCC is in the input state and the energy storage battery is in the charging state, it indicates that the electric energy of the photovoltaic energy storage charging system is insufficient and the energy storage battery cannot discharge. As shown in fig. 3, at this time, the input power of the PCC may be adjusted to 0, and the current operating power of the charging pile is reduced by Ppcc2, that is, the current operating power of the charging pile is reduced, so as to reduce the electric energy obtained from the power grid, thereby reducing the operating cost of the photovoltaic energy storage charging system.
And when the energy storage battery is in a discharging or standby state, the sum of the discharging power of the energy storage battery and the input power of the PCC is smaller than the power which can be currently reduced by the energy storage system. For example, when the input power of the PCC is less than or equal to the second power difference (Ppcc2 ≦ Pev-Pevmin) and the energy storage battery is in a discharge or standby state, when Ppcc2 ≦ Pev-Pevmin, the input power of the PCC may be decreased (Pev-Pevmin), that is, the input power of the PCC is adjusted to 0, so that the photovoltaic energy storage charging system does not obtain electric energy from the grid, while the discharge power of the energy storage battery is kept unchanged, the current operating power of the charging pile is decreased (Pev-Pevmin), that is, the current operating power of the charging pile is decreased to the lower operating power limit, and the power balance of the photovoltaic energy storage charging system is kept. When Ppcc2 > (Pev-Pevmin), the input power of the PCC can be reduced by C1, the discharge power of the energy storage battery can be reduced by C2, the current operating power of the charging pile can be reduced by C3, and C1+ C2 is reduced to C3, so that the power balance of the photovoltaic energy storage charging system is maintained, meanwhile, the reduced current operating power is controlled to be greater than or equal to Pevmin, and the current operating power of the charging pile is prevented from being lower than the rated minimum power. Or when Ppsc 2 is > (Pev-Pevmin), the output power of the PCC is kept unchanged, the charging power of the energy storage battery is reduced by D2, the current operating power of the charging pile is reduced by D3, and D2 is D3, so that the power balance of the photovoltaic energy storage charging system is kept, and meanwhile, the reduced current operating power is controlled to be greater than or equal to Pevmin. The specific values of D1, D2, and D3 may be set according to requirements, the discharge power of the energy storage battery and/or the output power of the PCC may be reduced, and the method of reducing the current operating power may include, but is not limited to, the above examples.
And if the energy storage battery is in a standby state, the state of the energy storage battery can be kept unchanged, and the input power of the PCC and the current operating power of the charging pile are reduced.
Optionally, the step of reducing the input power and/or the discharge power of the energy storage battery, and reducing the current operation power may include:
determining a second power sum of the input power and the discharge power;
under the condition that the second power sum is larger than the second power difference, adjusting the input power to be 0, reducing the discharge power, and adjusting the current operation power to be the lower limit of the operation power;
and under the condition that the second power sum is less than or equal to the second power difference, adjusting the input power and the discharge power to be 0, and reducing the current operation power by the second power sum.
In one embodiment, the control device may first calculate a second power sum of the discharged power of the energy storage battery and the input power of the PCC, the second power sum being Pbat2+ Ppcc2, when it is determined that the input power of the PCC is less than or equal to the second power difference and the energy storage battery is in the discharged state. As shown in fig. 3, when the second power sum is greater than the second power difference, that is, (Ppcc2+ Pbat) > (Pev-Pevmin), the input power of the PCC may be adjusted to 0, the current operating power of the charging pile may be adjusted to Pevmin, and the discharge power of the energy storage battery may be reduced, where the reduction range of the discharge power of the energy storage battery is (Pev-Pevmin-Ppcc2), so as to maintain the power balance of the photovoltaic energy storage charging system. Correspondingly, when the sum of the second power is less than or equal to the second power difference, namely (Ppcc2+ Pbat2) ≦ (Pev-Pevmin), the input power of the PCC is reduced to 0, the discharge power of the energy storage battery is reduced to 0, and meanwhile, the current operation power of the charging pile is reduced, and the reduction range of the current operation power of the charging pile is (Ppcc2+ Pbat 2).
In the embodiment of the invention, when the PCC is in the input state, the input power of the PCC is less than or equal to the second power difference value, and the energy storage battery is in the charging or standby state, the input power of the PCC is reduced, the operation cost of the photovoltaic energy storage charging system can be reduced, the discharge power of the energy storage battery is reduced, the charging and discharging times of the energy storage battery can be reduced, and the service life of the energy storage battery can be prolonged. When the input power of the PCC is reduced to 0, the operation cost of the photovoltaic energy storage and charging system can be reduced to the minimum extent.
Optionally, the method may further include:
under the condition that the power of a public connection point of a power grid is 0, if the energy storage battery is in a discharging or standby state, reducing the current running power and the discharging power of the energy storage battery by the same amplitude; the reduced current operating power is not lower than the lower limit of the operating power of the charging pile;
under the condition that the power of a public connection point of a power grid is 0, if the energy storage battery is in a charging state, reducing the charging power of the energy storage battery and increasing the current operation power; the increased current operating power is not higher than the upper operating power limit.
When the power of the PCC is 0, it indicates that the PCC point is in a zero state, the photovoltaic energy storage charging system does not output electric energy to the power grid through the PCC, and does not obtain electric energy from the power grid through the PCC, that is, no redundant electric energy exists in the photovoltaic energy storage charging system, and no electric energy is lacked. The reduction amplitude of the charging power and the increase amplitude of the current operation power can be the same so as to keep the power balance of the photovoltaic energy storage system.
In this embodiment, when the control device detects and determines that the power of the PCC is 0 and the energy storage battery is in a discharge state, the current operating power of the charging pile and the discharge power of the energy storage battery can be reduced, and the reduction amplitudes of the current operating power and the discharge power of the energy storage battery are the same, so as to keep the power balance of the photovoltaic energy storage charging system. As shown in fig. 3, when the discharging power of the energy storage battery is less than or equal to the second power difference, that is, Pbat2 is less than or equal to Pev-Pevmin, the discharging power of the energy storage battery may be reduced to 0, and the current operating power of the charging pile is reduced, where the reduction range of the current operating power of the charging pile is Pbat 2. When the discharging power of the energy storage battery is larger than the second power difference value, namely Pbat2 is larger than Pev-Pevmin, the discharging power of the energy storage battery can be reduced, the current operation power of the charging pile is adjusted to Pevmin, and the reducing range of the discharging power of the energy storage battery is Pev-Pevmin.
Similarly, when the control device detects and determines that the power of the PCC is 0 and the energy storage battery is in a charging state, the charging power of the energy storage battery can be reduced, the current operation power of the charging pile is increased, and the reduction amplitude of the charging power is the same as the increase amplitude of the current operation power. As shown in fig. 3, when the charging power of the energy storage battery is less than or equal to the first power difference, that is, Pbat1 is less than or equal to Pevmax-Pev, the charging power of the energy storage battery may be reduced to 0, and the current operating power of the charging pile may be increased, where the current operating power of the charging pile is increased by Pbat 1. When the charging power of the energy storage battery is larger than the first power difference value, namely Pbat1 is larger than Pevmax-Pev, the current operation power of the charging pile can be adjusted to Pevmax, meanwhile, the charging power of the energy storage battery is reduced, and the reduction range of the charging power of the energy storage battery is Pevmax-Pev.
Under the condition that the power of the public connection point of the power grid is 0, if the energy storage battery is in a standby state, the state of the energy storage battery can be kept unchanged, and the running power of the charging pile is kept unchanged.
In the embodiment of the invention, when the power of the public connection point of the power grid is 0 and the energy storage battery is in a discharge state, the discharge power of the energy storage battery is reduced, and when the power of the public connection point of the power grid is 0 and the energy storage battery is in a charge state, the charge power of the energy storage battery is reduced, so that the charge and discharge times of the energy storage battery can be reduced, and the service life of the energy storage battery can be prolonged.
Referring to fig. 4, fig. 4 is a flowchart illustrating steps of another energy scheduling method in an embodiment of the present invention, where the method is applied to a control device in a photovoltaic energy storage charging system, the photovoltaic energy storage charging system further includes a charging pile, an energy storage battery, and a load that can be turned off, and the control device is connected to the charging pile, the energy storage battery, and the load that can be turned off respectively; the method comprises the following steps:
step 401, under the condition that the charging pile is started, closing the load capable of being turned off, and acquiring the current operation power of the charging pile and the load power of the load capable of being turned off.
Step 402, obtaining a third power difference between the load power and the current operating power.
The structure of the photovoltaic energy storage charging system may refer to the above examples, which are not described herein in detail in this embodiment.
In this embodiment, the control device may monitor states of the charging pile and the turn-off load, and obtain the current operating power of the charging pile and the load power of the turn-off load in real time, where the load power is the current operating power of the turn-off load and may be represented by a symbol Pload. The control device determines that the charging pile is started after detecting that the charging pile starts to output electric energy to the electric equipment, and can close the turn-off load after determining that the charging pile is started. Further, a difference between the load power of the turn-off load and the current operating power of the charging pile may be calculated to obtain a third power difference, where the third power difference is Pload-Pev.
And 403, keeping the current running power unchanged, and adjusting the charging and discharging power of the energy storage battery based on the third power difference value to keep the power balance of the photovoltaic energy storage charging system.
In this embodiment, after the turn-off load is turned off, the load power of the turn-off load is provided to the charging pile to control the operation of the charging pile. As shown in fig. 5, fig. 5 is a schematic flow chart of a control method for an energy storage battery in an embodiment of the present invention, and when the current operating power is greater than the load power, the load power may be transferred to a charging pile, and further when the load power cannot meet the power demand of the charging pile, power is obtained from the energy storage battery first, and then power is obtained from a power grid. And vice versa. When the load power meets the power requirement of the charging pile, the rest power can be provided for the energy storage battery.
Optionally, the step of adjusting the charge-discharge power of the energy storage battery based on the third power difference comprises:
under the condition that the current running power is less than or equal to the load power, if the energy storage battery is in a discharging state, reducing the discharging power of the energy storage battery by a third power difference value;
under the condition that the current running power is less than or equal to the load power, if the energy storage battery is in a standby state, controlling the energy storage battery to charge at a charging power which is not higher than a third power difference value;
and under the condition that the current running power is less than or equal to the load power, if the energy storage battery is in a charging state, increasing the charging power of the energy storage battery by a third power difference value.
When the current operating power is less than or equal to the load power, the power saved after the load is turned off can meet the power requirement of the charging pile. When the energy storage battery is in a charging state, the controller can control the energy storage battery to be charged, when the energy storage battery is in a discharging state, the control equipment can control the charging power of the energy storage battery to be reduced, and when the energy storage battery is in a standby state, the energy storage battery can be controlled to be kept in the standby state or to be charged.
As shown in fig. 6, fig. 6 is a flow chart illustrating another control method for an energy storage battery in an embodiment of the invention, and when the current operating power is less than or equal to the load power, that is, Pev is less than or equal to Pload, the control device may first determine the charge-discharge state of the energy storage battery, and then control the charge-discharge power of the energy storage battery. For example, when Pev is equal to or less than Pload, the control device may determine that the load power may satisfy the power requirement of the charging pile, and if the third power difference is equal to 0, it is indicated that the load power may satisfy the power requirement of the charging pile, and the state of the energy storage battery may be maintained. Otherwise, if Pev is less than or equal to Pload, it is indicated that the load power not only can satisfy the power requirement of the charging pile, but also has redundant power, i.e., the third power difference value Pload-Pev. Further, if the energy storage battery is in a discharging state, the discharging power of the energy storage battery can be reduced, and the reduction range of the discharging power is a third power difference value, namely, the Pload-Pev is reduced, so as to maintain the power balance of the photovoltaic energy storage charging system. Similarly, as shown in fig. 5, if it is determined that the energy storage battery is in the standby state, the redundant power may be charged into the energy storage battery, and the energy storage battery is controlled to be converted from the standby state to the charging state, and the charging power may be equal to the third power difference Pload-Pev, so as to maintain the power balance of the photovoltaic energy storage charging system, or the charging power may be smaller than the third power difference. Similarly, as shown in fig. 5, when the energy storage battery is in a charging state, the charging power of the energy storage battery may be increased by a third power difference value, that is, increased by Pload-Pev, and the energy storage battery is controlled to continue to be charged, so as to maintain the power balance of the photovoltaic energy storage charging system. During the charging and discharging process of the battery, whether to Charge or discharge the battery may be determined based on a State of Charge (SOC) value of the battery.
In the embodiment of the invention, the control equipment closes the turn-off load after the charging pile is started, and reduces the charging power of the energy storage battery or increases the charging power of the energy storage battery when the load power of the turn-off load is greater than or equal to the current operating power of the charging pile, so that the utilization rate of electric energy in the photovoltaic energy storage charging system can be improved.
Optionally, the step of adjusting the charging and discharging power of the energy storage battery based on the third power difference further includes:
under the condition that the current running power is larger than the load power, if the energy storage battery is in a discharging state or a standby state, obtaining the discharging redundant power of the energy storage battery;
under the condition that the discharge redundant power is greater than or equal to the third power difference value, increasing the discharge power of the energy storage battery by the third power difference value;
under the condition that the discharge redundant power is smaller than the third power difference value, controlling the energy storage battery to discharge with the maximum discharge power, and controlling the input power of the public connection point of the power grid to increase by a first power value; the first power value is a difference between the discharge redundancy power and the third power difference.
In one embodiment, when the current operating power of the charging pile is greater than the load power of the turn-off load, it indicates that the load power cannot meet the power requirement of the charging pile, and power needs to be obtained from the energy storage battery. At this time, if the energy storage battery is in a discharge state, which indicates that the energy storage battery is already providing electric energy to the photovoltaic energy storage charging system, it is necessary to determine a discharge amount, that the energy storage battery can further increase, that is, a discharge redundant power. If the energy storage battery is in a standby state, it is indicated that the energy storage battery does not provide electric energy to the photovoltaic energy storage charging system, and it is necessary to determine the electric quantity which can be provided by the photovoltaic energy storage charging system by the photovoltaic energy storage battery at this time, that is, the discharge redundant power. After determining the discharge redundancy power, it is necessary to determine whether the sum of the discharge redundancy rate and the load power of the turn-off load can satisfy the power demand of the charging pile.
As shown in fig. 7, fig. 7 is a flowchart illustrating a control method of an energy storage battery according to another embodiment of the present invention, where Pev > Pload, if it is determined that the energy storage battery is in a discharge state, the SOC of the energy storage battery at the current time may be obtained, a discharge current corresponding to the battery state-of-charge value is obtained from a preset energy storage battery control parameter table, the maximum discharge power of the energy storage battery may be calculated according to the discharge current and the discharge voltage of the energy storage battery at the current time, the maximum discharge power may be represented by a symbol Pbatmax, and the maximum discharge power is subtracted from the discharge power at the current time, that is, the discharge power that may be increased at the current time of the energy storage battery, that is, the discharge redundant power Pbatmax-Pbat 2. If the discharging redundant power is larger than or equal to the third power difference value, namely Pbatmax-Pbat2 is larger than or equal to Pev-Pload, the sum of the discharging redundant power and the load power can meet the power requirement of the charging pile. At this time, the discharging power of the energy storage battery can be increased, the increasing amplitude of the discharging power is the third power difference, and the power balance of the photovoltaic energy storage charging system can be kept. Similarly, when Pev is greater than Pload, if the energy storage battery is determined to be in a standby state, the discharging redundant power of the energy storage battery can be determined, and if the discharging redundant power is greater than or equal to the third power difference value, it is indicated that the sum of the discharging redundant power and the load power can meet the power requirement of the charging pile. At this moment, the energy storage battery can be converted from a standby state to a discharge state, and the discharge power is adjusted to a third power difference value, so that the power balance of the photovoltaic energy storage charging system can be met. Further, when the discharging redundant power is smaller than the third power difference, namely Pbatmax-Pbat2 < Pev-Pload, the sum of the discharging redundant power and the load power cannot meet the power requirement of the charging pile. At this time, the energy storage battery may be controlled to discharge at the maximum discharge power, and obtain electric energy from the grid through the PCC point, if the power of the PCC is 0 or less than 0, the input power of the PCC point is increased, and the increase of the input power is the difference between the discharge redundant power and the third power, that is, the first power value is Pev-Pload- (Pbatmax-Pbat 2).
In the embodiment of the invention, when the current operating power of the charging pile is greater than the load power and the energy storage battery is in a discharging state or a standby state, the discharging redundant power of the energy storage battery is obtained, electric energy is preferentially obtained from the energy storage battery according to the discharging redundant power, and then the electric energy is obtained from a power grid through PCC, so that the operating cost of the photovoltaic energy storage charging system can be reduced.
Optionally, the step of adjusting the charging and discharging power of the energy storage battery based on the third power difference value may include:
under the condition that the current running power is larger than the load power, if the energy storage battery is in a charging state, determining the maximum power reduction amplitude of the charging power of the energy storage battery;
reducing the charging power by a third power difference value under the condition that the maximum power reduction amplitude is greater than or equal to the third power difference value;
under the condition that the maximum power reduction amplitude is smaller than the third power difference value, if the energy storage battery is determined to be dischargeable based on the battery charge state value of the energy storage battery, the energy storage battery is converted into a discharge state, and a fourth power difference value between the maximum power reduction amplitude and the third power difference value is obtained;
controlling the energy storage battery to discharge at a fourth power difference value under the condition that the maximum discharge power of the energy storage battery is greater than or equal to the fourth power difference value;
under the condition that the maximum discharge power is smaller than the fourth power difference value, controlling the energy storage battery to discharge at the maximum discharge power, and controlling the input power of the public connection point of the power grid to increase by a second power value; the second power value is the difference between the fourth power difference and the maximum discharge power.
In one embodiment, when the energy storage battery is in a charging state, indicating that there is excess electrical energy in the photovoltaic energy storage charging system, the electrical energy is being input to the energy storage battery. At this moment, if the current operating power of the charging pile is greater than the load power of the turn-off load, part or all of the electric energy input to the energy storage battery can be transferred to the charging pile, and the requirement of the charging pile is met under the condition that the basic charging requirement of the energy storage battery is met.
When the SOC value of the energy storage battery is greater than or equal to the initial SOC value, the charging of the energy storage battery can be stopped, and the state of the energy storage battery is converted into a standby state from a charging state; when the SOC value of the energy storage battery is larger than the initial SOC value and is larger than or equal to the target SOC value, the energy storage battery can be converted from a charging state to a discharging state. The initial SOC value is the lowest SOC value and is generally set by a manufacturer, the target SOC value is generally the SOC value set by a user, and the initial SOC value is smaller than the target SOC value. The user can set the lowest charging power of the energy storage battery when the SOC value is smaller than the initial SOC value, the lowest charging power can be represented by a symbol Pbat1min, and the lowest charging power can meet the lowest charging requirement of the energy storage battery when the SOC value is smaller than the initial SOC value. As shown in fig. 7, when determining that the current operating power of the charging pile is greater than the load power and the energy storage battery is in a charging state, the control device may first obtain an SOC value of the battery, determine that the energy storage battery needs to be charged when the SOC value is less than an initial SOC value, obtain a charging power Pbat1 of the energy storage battery at the current time and a pre-stored minimum charging power Pbat1min at this time, and when Pbat1 > Pbat1min, may calculate a difference between the charging power Pbat1 of the current time and the minimum charging power Pbat1min, to obtain a maximum power reduction amplitude, where the maximum power reduction amplitude is Pbat1-Pbat1 min. When the SOC value is greater than the initial SOC value, it is determined that the energy storage battery may stop charging, the charging power may be set to 0, and it may be further determined that the maximum power reduction of the charging power is the charging power Pbat1 at the current time. At this time, if the maximum power reduction amplitude is determined to be greater than or equal to the third power difference value by comparison, namely Pbat1-Pbat1min is greater than or equal to Pev-Pload or Pbat1 is greater than or equal to Pev-Pload, it is indicated that the power requirement of the charging pile can be met after the charging power of the energy storage battery is reduced, and the charging power of the energy storage battery can be reduced by the third power difference value so as to meet the power requirement of the charging pile.
As shown in fig. 7, if the maximum power reduction is smaller than the third power difference, it indicates that the power requirement of the charging pile cannot be met even if the charging power of the energy storage battery is reduced to the minimum value. At this time, the charging power of the energy storage battery may be reduced to a minimum value, that is, when the SOC value is lower than the initial SOC value, the charging power may be charged at the minimum charging power, and when the SOC value is greater than or equal to the initial SOC value, the charging power may be 0. Further, whether the energy storage battery can be discharged or not can be judged according to the SOC value, when the SOC value is smaller than the target SOC value, the energy storage battery cannot be discharged, at the moment, the charging power of the energy storage battery can be reduced by the maximum power reduction amplitude, and when the power of the PCC is 0 or smaller than 0, the input power of the PCC is increased, and the increase amplitude is Pev-Pload-Pbat 1.
Conversely, when the SOC value is greater than or equal to the target SOC value, it is determined that the energy storage battery may be shifted to a discharged state. At this time, a fourth power difference between the maximum power reduction amplitude and the third power difference, and the maximum discharging power Pbatmax that can be reached by the energy storage battery at the current moment may be obtained. Since the SOC value is greater than the initial and target SOC values, the maximum power drop is Pbat1 and the fourth power difference is Pev-Pload-Pbat 1. After the maximum amplification power Pbatmax is obtained, if the maximum discharge power of the energy storage battery is greater than or equal to a fourth power difference value, namely Pbatmax is greater than or equal to Pev-Pload-Pbat1, it is indicated that after the energy storage battery discharges, the power supply requirement of the charging pile can be met, the energy storage battery can be controlled to be converted from a charging state to a discharging state, and the energy storage battery discharges with the fourth power difference value. When Pbatmax is less than Pev-Pload-Pbat1, the power demand of the charging pile cannot be met when the energy storage battery is discharged at the maximum power, and electric energy needs to be obtained from the power grid through PCC. Therefore, when the control device is configured to control the energy storage battery to discharge at the maximum discharge power Pbatmax when the maximum discharge power is smaller than the fourth power difference, and to increase the input power of the PCC by a second power value when the power of the PCC is 0 or smaller than 0, the second power value being Pev-Pload-Pbat 1-Pbatmax.
In one embodiment, when the maximum power reduction amplitude of the energy storage battery is judged to be 0, electric energy can be directly obtained from a power grid through PCC, and the power requirement of a charging pile is met.
In the embodiment of the invention, when the load power cannot meet the power requirement of the charging pile, if the energy storage battery is in a charging state, the maximum power reduction amplitude of the energy storage battery is obtained, and when the maximum power reduction amplitude is greater than or equal to the third power difference value, the charging power of the energy storage battery can be reduced, the power requirement of the charging pile is met, electric energy is preferentially obtained from the energy storage battery, the electric energy can be prevented from being directly obtained from a power grid, and the operation cost of the photovoltaic energy storage charging system is reduced. When the maximum power reduction amplitude can not meet the requirement of the charging pile, whether the energy storage battery can discharge or not is judged at first, when the energy storage battery can discharge, the energy storage battery discharges at first, the power requirement of the charging pile is met, then the electric energy is obtained through PCC to meet the requirement of the charging pile, the electric energy can be prevented from being directly obtained from a power grid, and therefore the operation cost of the photovoltaic energy storage charging system can be reduced.
In summary, in the embodiment of the present invention, when the charging pile is started, the turn-off load is turned off, the current operating power of the charging pile and the load power of the turn-off load are obtained, a third power difference between the load power and the current operating power is obtained, the current operating power is kept unchanged, and the charging and discharging power of the energy storage battery is adjusted based on the third power difference, so as to keep the power balance of the photovoltaic energy storage and charging system. After a charging pile in the photovoltaic energy storage charging system is started, the load capable of being turned off is closed, redundant power after the load capable of being turned off is provided for the charging pile, the power balance of the photovoltaic energy storage charging system is adjusted according to the difference value between the operating power of the charging pile and the load power of the load capable of being turned off, under the condition that the charging requirement of the charging pile is met, the power consumption of the whole system can be reduced, and therefore the operating cost of the photovoltaic energy storage system can be reduced.
Referring to fig. 8, fig. 8 is a flowchart illustrating steps of another energy scheduling method in an embodiment of the present invention, where the method is applied to a control device in a photovoltaic energy storage charging system, the control device may execute the energy scheduling method illustrated in fig. 1 in response to a first input when receiving the first input, and the control device may execute the energy scheduling method illustrated in fig. 4 in response to a second input when receiving a second input. For example, the control device may be configured to a first mode and a second mode, and the first input and the second input may be a mode switching operation. For example, a first mode switching button and a second mode switching button may be integrated on the control device, and when the user clicks the first mode switching button, the control device may switch the mode of the control device to the first mode in response to a user clicking operation, i.e., a first input. When the user clicks the second mode switching button, the control device may switch the mode of the control device to the second mode in response to a click operation of the user, and the operation of the user clicking the second mode switching button is the second input. The method flow shown in fig. 1 is executed when the control device switches to the first mode, and the method flow shown in fig. 4 is executed when the control device switches to the second mode. The specific form of the first input and the second input may be set according to the requirement, which is not limited in this embodiment.
Referring to fig. 9, which shows a schematic structural diagram of an energy scheduling apparatus in an embodiment of the present invention, the apparatus 900 is disposed in a control device in a photovoltaic energy storage charging system, the photovoltaic energy storage charging system further includes a charging pile and an energy storage battery, and the control device is respectively connected to the charging pile, the energy storage battery, and a public connection point of a power grid; the apparatus 900 comprises:
a first obtaining module 901, configured to obtain current operating power of a charging pile when the charging pile is started;
a second obtaining module 902, configured to obtain a first power difference between an upper operating power limit of the charging pile and a current operating power;
the control module 903 is configured to, when the output power of the grid public connection point does not exceed the first power difference, reduce the output power and/or the charging power of the energy storage battery and increase the current operating power if the energy storage battery is in a charging or standby state;
wherein the increased current operating power is less than or equal to the upper operating power limit.
Optionally, the control module 903 is further configured to reduce the output power to 0 and increase the current operating power by the output power if the energy storage battery is in a discharge state under the condition that the output power does not exceed the first power difference; when the output power is larger than the first power difference value, reducing the output power and increasing the current operation power;
wherein the increased current operating power is equal to the upper operating power limit.
Optionally, the control module 903 is specifically configured to obtain a first power sum of the charging power and the output power; under the condition that the first power sum is larger than the first power difference, adjusting the output power to be 0, reducing the charging power, and increasing the current operation power to the operation power upper limit; and reducing the output power and the charging power to 0 and increasing the current operation power by the first power sum when the first power sum is less than or equal to the first power difference.
Optionally, the control module 903 is further configured to obtain a second power difference between the lower operating power limit of the charging pile and the current operating power; reducing the current operating power and the input power by the same amplitude under the condition that the input power of the public connection point of the power grid is greater than the second power difference value; and the reduced current running power is not lower than the lower limit of the running power.
Optionally, the control module 903 is further configured to, when the input power is less than or equal to the second power difference, adjust the input power to 0 and reduce the current operating power by the input power if the energy storage battery is in a charging state. Under the condition that the input power is smaller than or equal to the second power difference value, if the energy storage battery is in a discharging or standby state, reducing the input power and/or the discharging power of the energy storage battery, and reducing the current operation power; and the reduced current running power is not lower than the lower limit of the running power.
Optionally, the control module 903 is specifically configured to obtain a second power sum of the input power and the discharge power; reducing the input power to 0, reducing the discharge power and reducing the current operation power to the lower limit of the operation power under the condition that the second power sum is greater than the second power difference; reducing both the input power and the discharge power to 0 and reducing the current operating power by the second power sum when the second power sum is less than or equal to the second power difference
Optionally, the control module 903 is specifically configured to, when the power of the grid common connection point is 0, reduce the current operating power and the discharge power of the energy storage battery by the same amplitude if the energy storage battery is in a discharge or standby state; the reduced current operating power is not lower than the lower limit of the operating power of the charging pile; under the condition that the power of a public connection point of a power grid is 0, if the energy storage battery is in a charging state, reducing the charging power of the energy storage battery and increasing the current operation power; wherein the increased current operating power is not higher than the upper operating power limit.
Referring to fig. 9, which shows a schematic structural diagram of another energy scheduling apparatus in an embodiment of the present invention, the apparatus 1000 is disposed in a control device in a photovoltaic energy storage charging system, the photovoltaic energy storage charging system further includes a charging pile, an energy storage battery, and a turn-off load, and the control device is connected to the charging pile, the energy storage battery, and the turn-off load respectively; the apparatus 1000 comprises:
the first obtaining module 1001 is configured to, when the charging pile is started, close the load that can be turned off, and obtain a current operating power of the charging pile and a load power of the load that can be turned off;
a second obtaining module 1002, configured to obtain a third power difference between the load power and the current operating power;
and the control module 1003 is configured to keep the current operating power unchanged, and adjust the charging and discharging power of the energy storage battery based on the third power difference value, so as to keep the power balance of the photovoltaic energy storage charging system.
Optionally, the control module 1003 is specifically configured to, when the current operating power is less than or equal to the load power, reduce the discharging power of the energy storage battery by a third power difference if the energy storage battery is in a discharging state; under the condition that the current running power is less than or equal to the load power, if the energy storage battery is in a standby state, controlling the energy storage battery to charge at a charging power which is not higher than a third power difference value; and under the condition that the current running power is less than or equal to the load power, if the energy storage battery is in a charging state, increasing the charging power of the energy storage battery by a third power difference value.
Optionally, the control device is connected with a grid public connection point; the control module 1003 is specifically configured to, when the current operating power is greater than the load power, obtain a discharging redundant power of the energy storage battery if the energy storage battery is in a discharging state or a standby state; under the condition that the discharge redundant power is greater than or equal to the third power difference value, increasing the discharge power of the energy storage battery by the third power difference value; under the condition that the discharge redundant power is smaller than the third power difference value, controlling the energy storage battery to discharge with the maximum discharge power, and controlling the input power of the public connection point of the power grid to increase by a first power value; the first power value is a difference between the discharge redundancy power and the third power difference.
Optionally, the control device is connected with a grid public connection point; the control module 1003 is specifically configured to determine a maximum power reduction of charging power of the energy storage battery if the energy storage battery is in a charging state under the condition that the current operating power is greater than the load power; reducing the charging power by a third power difference value under the condition that the maximum power reduction amplitude is greater than or equal to the third power difference value; under the condition that the maximum power reduction amplitude is smaller than the third power difference value, if the energy storage battery is determined to be dischargeable based on the battery charge state value of the energy storage battery, the energy storage battery is converted into a discharge state, and a fourth power difference value between the maximum power reduction amplitude and the third power difference value is obtained; controlling the energy storage battery to discharge at a fourth power difference value under the condition that the maximum discharge power of the energy storage battery is greater than or equal to the fourth power difference value; under the condition that the maximum discharge power is smaller than the fourth power difference value, controlling the energy storage battery to discharge at the maximum discharge power, and controlling the input power of the public connection point of the power grid to increase by a second power value; the second power value is a difference between the fourth power difference and the maximum discharge power.
An embodiment of the present invention further provides a control device, where the control device includes a processor, a memory, and a program or an instruction stored on the memory and executable on the processor, and the program or the instruction, when executed by the processor, implements the steps of the energy scheduling method described above.
Embodiments of the present invention also provide a readable storage medium, on which a program or instructions are stored, and when executed by a processor, the program or instructions implement the steps of the energy scheduling method as described above.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
It will be appreciated by those skilled in the art that the scope of the disclosure herein is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the spirit of the disclosure. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (25)

1. The energy scheduling method is characterized by being applied to control equipment in a photovoltaic energy storage charging system, wherein the photovoltaic energy storage charging system further comprises a charging pile and an energy storage battery, and the control equipment is respectively connected with the charging pile, the energy storage battery and a public connection point of a power grid; the method comprises the following steps:
under the condition that the charging pile is started, acquiring the current operating power of the charging pile;
acquiring a first power difference value between the upper operating power limit of the charging pile and the current operating power;
under the condition that the output power of the grid public connection point does not exceed the first power difference value, if the energy storage battery is in a charging or standby state, reducing the output power and/or the charging power of the energy storage battery, and increasing the current operation power;
wherein the increased current row power is less than or equal to the upper operating power limit.
2. The method of claim 1, further comprising:
under the condition that the output power does not exceed the first power difference value, if the energy storage battery is in a discharging state, reducing the output power to 0, and increasing the current operation power by the output power;
reducing the output power and increasing the current operating power when the output power is greater than the first power difference;
wherein the increased current operating power is less than or equal to the operating power upper limit.
3. The method of claim 1, wherein reducing the output power and/or the charging power of the energy storage battery and increasing the current operating power comprises:
obtaining a first power sum of the charging power and the output power;
adjusting the output power to 0 and decreasing the charging power and increasing the current operating power to the operating power upper limit if the first power sum is greater than the first power difference;
and reducing the output power and the charging power to 0 and increasing the current operation power by the first power sum if the first power sum is less than or equal to the first power difference.
4. The method of claim 1, further comprising:
acquiring a second power difference value between the lower operating power limit of the charging pile and the current operating power;
reducing the current operating power and the input power by the same magnitude when the input power of the grid point of common connection is greater than the second power difference;
wherein the reduced current operating power is not lower than the operating power lower limit.
5. The method of claim 4, further comprising:
under the condition that the input power is smaller than or equal to the second power difference value, if the energy storage battery is in a charging state, adjusting the input power to be 0, and reducing the current operation power by the input power;
under the condition that the input power is smaller than or equal to the second power difference value, if the energy storage battery is in a discharging or standby state, reducing the input power and/or the discharging power of the energy storage battery, and reducing the current operation power;
wherein the reduced current operating power is not lower than the operating power lower limit.
6. The method of claim 5, wherein reducing the input power and/or the discharge power of the energy storage battery and reducing the current operating power comprises:
acquiring a second power sum of the input power and the discharge power;
reducing the input power to 0 and the discharge power and the current operating power to the operating power lower limit if the second power sum is greater than the second power difference;
and reducing the input power and the discharge power to 0 and reducing the current operation power by the second power sum when the second power sum is less than or equal to the second power difference.
7. The method of claim 1, further comprising:
under the condition that the power of the public connection point of the power grid is 0, if the energy storage battery is in a discharging or standby state, reducing the current running power and the discharging power of the energy storage battery by the same amplitude; the reduced current operating power is not lower than the lower limit of the operating power of the charging pile;
under the condition that the power of the public connection point of the power grid is 0, if the energy storage battery is in a charging state, reducing the charging power of the energy storage battery and increasing the current operation power;
wherein the increased current operating power is not higher than the operating power upper limit.
8. The energy scheduling method is characterized by being applied to control equipment in a photovoltaic energy storage charging system, wherein the photovoltaic energy storage charging system further comprises a charging pile, an energy storage battery and a turn-off load, and the control equipment is respectively connected with the charging pile, the energy storage battery and the turn-off load; the method comprises the following steps:
under the condition that the charging pile is started, closing the turn-off load, and acquiring the current operating power of the charging pile and the load power of the turn-off load;
obtaining a third power difference value between the load power and the current operation power;
keeping the current operation power unchanged, and adjusting the charging and discharging power of the energy storage battery based on the third power difference value so as to keep the power balance of the photovoltaic energy storage charging system.
9. The method of claim 8, wherein the adjusting the charging and discharging power of the energy storage battery based on the third power difference comprises:
under the condition that the current running power is smaller than or equal to the load power, if the energy storage battery is in a discharging state, reducing the discharging power of the energy storage battery by the third power difference;
under the condition that the current running power is smaller than or equal to the load power, if the energy storage battery is in a standby state, controlling the energy storage battery to be charged at a charging power which is not higher than the third power difference value;
and under the condition that the current running power is less than or equal to the load power, if the energy storage battery is in a charging state, increasing the charging power of the energy storage battery by the third power difference.
10. The method of claim 8, wherein the control device is connected to a grid point of common connection; the adjusting the charging and discharging power of the energy storage battery based on the third power difference value comprises:
under the condition that the current running power is larger than the load power, if the energy storage battery is in a discharging state or a standby state, obtaining discharging redundant power of the energy storage battery;
increasing the discharging power of the energy storage battery by the third power difference value when the discharging redundant power is greater than or equal to the third power difference value;
under the condition that the discharge redundant power is smaller than the third power difference value, controlling the energy storage battery to discharge at the maximum discharge power, and controlling the input power of the public connection point of the power grid to increase by a first power value; the first power value is a difference between the discharge redundancy power and the third power difference.
11. The method of claim 8, wherein the control device is connected to a grid point of common connection; the adjusting the charging and discharging power of the energy storage battery based on the third power difference value comprises:
under the condition that the current running power is larger than the load power, if the energy storage battery is in a charging state, determining the maximum power reduction amplitude of the charging power of the energy storage battery;
reducing the charging power by the third power difference value when the maximum power reduction is greater than or equal to the third power difference value;
under the condition that the maximum power reduction amplitude is smaller than the third power difference value, if the energy storage battery can be discharged based on the battery charge state value of the energy storage battery, the energy storage battery is converted into a discharge state, and a fourth power difference value between the maximum power reduction amplitude and the third power difference value is obtained;
under the condition that the maximum discharge power of the energy storage battery is greater than or equal to the fourth power difference value, controlling the energy storage battery to discharge at the fourth power difference value;
under the condition that the maximum discharge power is smaller than the fourth power difference value, controlling the energy storage battery to discharge at the maximum discharge power, and controlling the input power of the public connection point of the power grid to increase by a second power value; the second power value is a difference between the fourth power difference and the maximum discharge power.
12. An energy scheduling method is applied to a control device in a photovoltaic energy storage charging system, and comprises the following steps:
in the event that a first input is received, in response to the first input, performing the method of any of claims 1-7;
upon receiving a second input, performing the method of any of claims 8-11 in response to the second input.
13. The energy scheduling device is characterized by comprising control equipment arranged in a photovoltaic energy storage charging system, wherein the photovoltaic energy storage charging system also comprises a charging pile and an energy storage battery, and the control equipment is respectively connected with the charging pile, the energy storage battery and a public connection point of a power grid; the device comprises:
the first acquisition module is used for acquiring the current operating power of the charging pile under the condition that the charging pile is started;
the second acquisition module is used for acquiring a first power difference value between the upper operating power limit of the charging pile and the current operating power;
the control module is used for reducing the output power and/or the charging power of the energy storage battery and increasing the current operation power if the energy storage battery is in a charging or standby state under the condition that the output power of the public connection point of the power grid does not exceed the first power difference;
wherein the increased current operating power is less than or equal to the operating power upper limit.
14. The apparatus of claim 13, wherein the control module is further configured to decrease the output power to 0 and increase the current operating power by the output power if the energy storage battery is in a discharge state under the condition that the output power does not exceed the first power difference; reducing the output power and increasing the current operating power when the output power is greater than the first power difference;
wherein the increased current operating power is less than or equal to the operating power upper limit.
15. The apparatus of claim 13, wherein the control module is specifically configured to obtain a first power sum of the charging power and the output power; adjusting the output power to 0 and decreasing the charging power and increasing the current operating power to the operating power upper limit if the first power sum is greater than the first power difference; and reducing the output power and the charging power to 0 and increasing the current operation power by the first power sum if the first power sum is less than or equal to the first power difference.
16. The apparatus of claim 13, wherein the control module is further configured to obtain a second power difference between a lower operating power limit of the charging pile and the current operating power; reducing the current operating power and the input power by the same magnitude when the input power of the grid point of common connection is greater than the second power difference; wherein the reduced current operating power is not lower than the operating power lower limit.
17. The apparatus of claim 16, wherein the control module is further configured to, if the input power is less than or equal to the second power difference value, adjust the input power to 0 and reduce the current operating power by the input power if the energy storage battery is in a charging state; under the condition that the input power is smaller than or equal to the second power difference value, if the energy storage battery is in a discharging or standby state, reducing the input power and/or the discharging power of the energy storage battery, and reducing the current operation power; wherein the reduced current operating power is not lower than the operating power lower limit.
18. The apparatus according to claim 17, wherein the control module is specifically configured to obtain a second power sum of the input power and the discharge power; in the case that the second power sum is greater than the second power difference, reducing the input power to 0, and reducing the discharge power, and reducing the current operating power to the operating power lower limit; and reducing the input power and the discharge power to 0 and reducing the current operation power by the second power sum when the second power sum is less than or equal to the second power difference.
19. The device according to claim 13, wherein the control module is specifically configured to, when the power of the grid common node is 0, reduce the current operating power and the discharge power of the energy storage battery by the same magnitude if the energy storage battery is in a discharge or standby state; the reduced current operating power is not lower than the lower limit of the operating power of the charging pile; under the condition that the power of the public connection point of the power grid is 0, if the energy storage battery is in a charging state, reducing the charging power of the energy storage battery and increasing the current operation power; wherein the increased current operating power is not higher than the operating power upper limit.
20. An energy scheduling device is characterized in that control equipment is arranged in a photovoltaic energy storage charging system, the photovoltaic energy storage charging system further comprises a charging pile, an energy storage battery and a turn-off load, and the control equipment is respectively connected with the charging pile, the energy storage battery and the turn-off load; the device comprises:
the first acquisition module is used for closing the turn-off load under the condition that the charging pile is started, and acquiring the current operating power of the charging pile and the load power of the turn-off load;
the second obtaining module is used for obtaining a third power difference value between the load power and the current operation power;
and the control module is used for keeping the current running power unchanged and adjusting the charging and discharging power of the energy storage battery based on the third power difference value so as to keep the power balance of the photovoltaic energy storage and charging system.
21. The apparatus according to claim 20, wherein the control module is specifically configured to, when the current operating power is less than or equal to the load power, decrease the discharging power of the energy storage battery by the third power difference if the energy storage battery is in a discharging state; under the condition that the current running power is smaller than or equal to the load power, if the energy storage battery is in a standby state, controlling the energy storage battery to be charged at a charging power which is not higher than the third power difference value; and under the condition that the current running power is less than or equal to the load power, if the energy storage battery is in a charging state, increasing the charging power of the energy storage battery by the third power difference.
22. The apparatus of claim 20, wherein the control device is connected to a grid point of common connection; the control module is specifically configured to, under the condition that the current operating power is greater than the load power, obtain a discharging redundant power of the energy storage battery if the energy storage battery is in a discharging state or a standby state; increasing the discharging power of the energy storage battery by the third power difference value when the discharging redundant power is greater than or equal to the third power difference value; under the condition that the discharge redundant power is smaller than the third power difference value, controlling the energy storage battery to discharge at the maximum discharge power, and controlling the input power of the public connection point of the power grid to increase by a first power value; the first power value is a difference between the discharge redundancy power and the third power difference.
23. The apparatus of claim 20, wherein the control device is connected to a grid point of common connection; the control module is specifically configured to determine a maximum power reduction of the charging power of the energy storage battery if the energy storage battery is in a charging state under the condition that the current operating power is greater than the load power; reducing the charging power by the third power difference value when the maximum power reduction is greater than or equal to the third power difference value; under the condition that the maximum power reduction amplitude is smaller than the third power difference value, if the energy storage battery can be discharged based on the battery charge state value of the energy storage battery, the energy storage battery is converted into a discharge state, and a fourth power difference value between the maximum power reduction amplitude and the third power difference value is obtained; under the condition that the maximum discharge power of the energy storage battery is greater than or equal to the fourth power difference value, controlling the energy storage battery to discharge at the fourth power difference value; under the condition that the maximum discharge power is smaller than the fourth power difference value, controlling the energy storage battery to discharge at the maximum discharge power, and controlling the input power of the public connection point of the power grid to increase by a second power value; the second power value is a difference between the fourth power difference and the maximum discharge power.
24. A control device comprising a processor, a memory, and a program or instructions stored on the memory and executable on the processor, the program or instructions when executed by the processor implementing the steps of the energy scheduling method of any one of claims 1-12.
25. A readable storage medium, characterized in that the readable storage medium has stored thereon a program or instructions which, when executed by a processor, carry out the steps of the energy scheduling method according to any one of claims 1-12.
CN202111321019.2A 2021-11-09 2021-11-09 Energy scheduling method, device, control equipment and storage medium Pending CN114513013A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116039437A (en) * 2023-01-09 2023-05-02 广东天枢新能源科技有限公司 Energy scheduling system of high-power liquid cooling charging pile
WO2023236625A1 (en) * 2022-06-10 2023-12-14 华为数字能源技术有限公司 Scheduling method and device for energy storage and charging system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023236625A1 (en) * 2022-06-10 2023-12-14 华为数字能源技术有限公司 Scheduling method and device for energy storage and charging system
CN116039437A (en) * 2023-01-09 2023-05-02 广东天枢新能源科技有限公司 Energy scheduling system of high-power liquid cooling charging pile
CN116039437B (en) * 2023-01-09 2023-08-15 广东天枢新能源科技有限公司 Energy scheduling system of high-power liquid cooling charging pile

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