CN115622020A - Virtual power plant system facing direct current load and operation method - Google Patents

Virtual power plant system facing direct current load and operation method Download PDF

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Publication number
CN115622020A
CN115622020A CN202211299289.2A CN202211299289A CN115622020A CN 115622020 A CN115622020 A CN 115622020A CN 202211299289 A CN202211299289 A CN 202211299289A CN 115622020 A CN115622020 A CN 115622020A
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China
Prior art keywords
direct
energy storage
current
power
direct current
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Pending
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CN202211299289.2A
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Chinese (zh)
Inventor
朱庆
林慧婕
张卫国
陆震军
张良
吴跃斌
侯磊
郑红娟
顾琳琳
孙广明
李津
曹晓波
余洋
周材
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State Grid Hebei Electric Power Co Ltd
Nari Technology Co Ltd
NARI Nanjing Control System Co Ltd
State Grid Electric Power Research Institute
Original Assignee
State Grid Hebei Electric Power Co Ltd
Nari Technology Co Ltd
NARI Nanjing Control System Co Ltd
State Grid Electric Power Research Institute
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Application filed by State Grid Hebei Electric Power Co Ltd, Nari Technology Co Ltd, NARI Nanjing Control System Co Ltd, State Grid Electric Power Research Institute filed Critical State Grid Hebei Electric Power Co Ltd
Priority to CN202211299289.2A priority Critical patent/CN115622020A/en
Publication of CN115622020A publication Critical patent/CN115622020A/en
Pending legal-status Critical Current

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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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/10—Parallel operation of dc sources
    • H02J1/102—Parallel operation of dc sources being switching converters
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • H02J1/14—Balancing the load in a 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • 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
    • 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
    • H02J2300/28—The renewable source being wind energy
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/40—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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

Abstract

The invention discloses a virtual power plant system facing direct current load and an operation method thereof, wherein the virtual power plant system comprises: the system comprises a new energy power generation system, a direct-current energy storage system, an energy control system, a three-phase rectifier bridge module and a direct-current electric energy meter; the system monitors the output power of the new energy power generation system, the charge state of the direct current energy storage system and the required power of the direct current load through the energy control system, and controls the on-off of the new energy power generation system, the direct current energy storage system, the three-phase rectifier bridge module and a direct current bus connecting circuit. According to the method, the virtual power plant operation strategy facing the intelligent household direct current load is formulated according to the real-time electricity price and the direct current load requirement, the utilization rate of clean energy is improved, and the electricity utilization cost is reduced.

Description

Virtual power plant system facing direct current load and operation method
Technical Field
The invention belongs to the technical field of power system control, and particularly relates to a direct-current load-oriented virtual power plant system and an operation method.
Background
In the traditional direct-current load power distribution technology, the commercial power is rectified into direct current only on the power distribution side, although a rectifying module of most load equipment is omitted, so that the overall energy efficiency of the load is improved. However, as the power consumption of the load is continuously increased, the harmonic impact influence of the rectifier module on the power grid cannot be ignored. Meanwhile, the new energy grid connection brings challenges to the stability of a power grid, and the new energy generating capacity can be directly consumed to be favorable for the construction of a novel power system if the new energy grid connection can be used for power distribution measurement. In recent years, with the rapid rise of new energy technologies and energy storage technologies, energy internet technologies are continuously mature. Under the emerging energy internet mode, the multi-form energy is required to realize multi-source complementation in parallel, renewable energy is required to be preferred, and meanwhile, all links are required to be coordinated and matched, so that the electricity consumption cost is reduced, the virtual power plant can realize the optimized scheduling of the distributed power supply in multiple regions and a large range, and the influence of new energy grid connection on a load side is broken through. Distributed generation combines together with power consumption side equipment, provides a more clean efficient novel energy supply mode, and the power consumption load of urging to produce a batch cleanness, the direct current simultaneously to conveniently realize the seamless butt joint of distributed energy and power consumption side equipment, under the condition that a large amount of new forms of energy are incorporated into the power networks, realize that the optimal utilization of direct current electric energy becomes the key link of this kind of electric energy supply mode.
Disclosure of Invention
The invention aims to provide a direct-current load-oriented virtual power plant system and an operation method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a virtual power plant system facing a direct current load, which is connected between a power grid and the direct current load on a load side, and comprises the following components: the system comprises a new energy power generation system, a direct-current energy storage system, an energy control system, a three-phase rectifier bridge module and a direct-current electric energy meter;
the new energy power generation system, the direct-current energy storage system and the three-phase rectifier bridge module are connected with a direct-current load on the load side through a direct-current bus; the new energy power generation system, the direct-current energy storage system, the three-phase rectifier bridge module and the direct-current electric energy meter are all connected with the energy control system;
the new energy power generation system is used for supplying power to a direct current load on a load side;
the direct-current energy storage system is used for exchanging energy with a direct-current bus;
the alternating current input end of the three-phase bridge rectification module is connected with a power grid, and the three-phase bridge rectification module is used for supplying power to a direct current load on a load side by utilizing the power grid;
the direct current electric energy meter is connected with the direct current bus and the direct current load and is used for collecting the power required by the direct current load;
the energy control system is used for monitoring the output power of the new energy power generation system, the state of charge (SOC) of the direct-current energy storage system and the direct-current load required power; the system is used for controlling the on-off of the new energy power generation system, the direct current energy storage system, the three-phase rectifier bridge module and a direct current bus connecting circuit; the control mode is as follows:
when the output power of the new energy power generation system is greater than the power required by the direct current load, controlling a connecting line between the three-phase rectifier bridge module and the direct current bus to be switched off, and disconnecting the power grid from the direct current load; the on-off of the new energy power generation system and a connecting circuit between the direct current energy storage system and the direct current bus are controlled according to the state of charge (SOC) of the direct current energy storage system;
when the output power of the new energy power generation system is smaller than the power required by the direct current load, controlling the conduction of a connecting circuit between the three-phase rectifier bridge module and the direct current bus; and according to the real-time electricity price of the current power grid, on-off of a connecting circuit between the new energy power generation system and the direct current energy storage system and the direct current bus is controlled.
Further, the new energy power generation system comprises a photovoltaic power generation system and a wind power generation system;
the photovoltaic power generation system comprises at least one group of photovoltaic arrays and unidirectional DC/DC modules; the input end of a unidirectional DC/DC module of the photovoltaic power generation system is connected with the photovoltaic array; the output end of a unidirectional DC/DC module of the photovoltaic power generation system is connected with a direct current bus;
the wind power generation system comprises a wind power generator set and a unidirectional DC/DC module; the input end of a unidirectional DC/DC module of the wind power generation system is connected with a wind power generator set; and the output end of the unidirectional DC/DC module of the wind power generation system is connected with a direct current bus.
Furthermore, the direct current energy storage system and the new energy power generation system are connected with a direct current load through a direct current switch.
Further, the direct-current energy storage system comprises at least one group of energy storage units, a bidirectional DC/DC module and an electricity meter;
the input end of the bidirectional DC/DC module is connected with the energy storage unit, and the output end of the bidirectional DC/DC module is connected with the direct current bus;
the input end of the electricity meter is connected with the energy storage unit, the output end of the electricity meter is connected with the energy control system, and the electricity meter is used for measuring the state of charge (SOC) of the energy storage unit.
Furthermore, the energy storage unit is a lithium battery energy storage unit.
Further, the electricity meter is particularly useful for,
continuously integrating the total current flowing into/out of the energy storage unit;
and taking the net charge number obtained by integration as the state of charge SOC of the energy storage unit.
Furthermore, the energy control system comprises a computing device, a power collector and a switch controller;
the computing equipment is used for recording the real-time electricity price of the power grid and configuring the action electricity price;
the power collector is connected with the direct current electric energy meter, the electricity meter of the direct current energy storage system and the output end of the new energy power generation system and is used for collecting load required power, residual electricity of the energy storage unit of the direct current energy storage system and output power of the new energy power generation system;
the switch controller is connected with the one-way DC/DC module in the new energy power generation system, the two-way DC/DC module in the direct current energy storage system, the three-phase rectifier bridge module and the direct current switch, and the switch controller is used for controlling the on-off of the new energy power generation system, the direct current energy storage system, the three-phase rectifier bridge module and a direct current switch and direct current bus connecting circuit.
Further, the switching controller is specifically configured to,
if the SOC of the direct-current energy storage system is smaller than the preset maximum threshold of the SOC of the energy storage unit, controlling the conduction of a connecting circuit between the new energy power generation system and the direct-current bus and controlling the conduction of the connecting circuit between the direct-current energy storage system and the direct-current bus;
and if the SOC quantity of the direct-current energy storage system is larger than the preset maximum threshold value of the state of charge of the energy storage unit, controlling the connection circuit between the new energy power generation system and the direct-current bus to be conducted, and controlling the connection circuit between the direct-current energy storage system and the direct-current bus to be switched off.
Further, the switching controller is specifically configured to,
when the real-time electricity price K of the current power grid is less than Kmin, if the SOC of the direct-current energy storage system is less than the preset maximum threshold of the SOC of the energy storage unit, controlling a connecting line between the new energy power generation system and the direct-current bus to be switched off, controlling the connecting line between the direct-current energy storage system and the direct-current bus to be switched on, and simultaneously supplying power to the direct-current load and the energy storage unit through the power grid;
if the SOC of the direct-current energy storage system is larger than the preset maximum threshold of the SOC of the energy storage unit, controlling a connecting line between the new energy power generation system and the direct-current bus to be switched off, controlling the connecting line between the direct-current energy storage system and the direct-current bus to be switched off, and supplying power to a direct-current load only through a power grid;
when the real-time electricity price of the current power grid meets the condition that Kmin is more than K and less than Kmax, the direct current switch is disconnected, power is supplied to a direct current load through the power grid, the SOC of the direct current energy storage system is collected, and when the SOC is more than 20% and less than 80%, the direct current energy storage system is controlled to be connected and charged through the power grid; when the SOC is more than 80% or the SOC is less than 20%, the direct-current energy storage system is disconnected; kmin and Kmax are pre-configured action electricity prices;
when the real-time electricity price K of the current power grid is larger than Kmax, controlling the direct current switch to be conducted, if the state of charge SOC of the direct current energy storage system is larger than a preset minimum threshold value of the state of charge of the energy storage unit, controlling the new energy power generation system and the direct current energy storage system to be conducted with a connecting circuit between a direct current bus, and simultaneously supplying power to a direct current load through the power grid, the new energy power generation system and the direct current energy storage system;
and if the SOC of the DC energy storage system is smaller than the preset minimum threshold of the SOC of the energy storage unit, controlling the connection between the new energy power generation system and the DC bus to be conducted, controlling the line between the DC energy storage system and the DC bus to be switched off, and supplying power to the DC load through the power grid and the new energy power generation system.
The invention also provides an operation method of the virtual power plant system facing the direct current load, which comprises the following steps:
acquiring output power of a new energy power generation system, a state of charge (SOC) of a direct current energy storage system and direct current load required power through a power collector; the on-off of the new energy power generation system, the direct current energy storage system and the three-phase rectifier bridge module and the direct current bus connecting circuit are controlled in the following mode:
when the output power of the new energy power generation system is greater than the power required by the direct current load, controlling a connecting line between the three-phase rectifier bridge module and the direct current bus to be switched off, and disconnecting the power grid from the direct current load; the on-off of the new energy power generation system and a connecting circuit between the direct current energy storage system and the direct current bus are controlled according to the state of charge (SOC) of the direct current energy storage system;
when the output power of the new energy power generation system is smaller than the power required by the direct current load, controlling the conduction of a connecting circuit between the three-phase rectifier bridge module and the direct current bus; and controlling the on-off of a connecting circuit between the new energy power generation system, the direct current energy storage system and the direct current bus according to the real-time electricity price of the current power grid.
Further, the controlling the on-off of the new energy power generation system and the connecting line between the direct current energy storage system and the direct current bus according to the state of charge SOC of the direct current energy storage system includes:
if the SOC of the DC energy storage system is smaller than the preset maximum threshold value of the SOC of the energy storage unit, controlling the conduction of a connecting circuit between the new energy power generation system and the DC bus and controlling the conduction of the connecting circuit between the DC energy storage system and the DC bus;
and if the SOC quantity of the direct-current energy storage system is larger than the preset maximum threshold value of the state of charge of the energy storage unit, controlling the connection circuit between the new energy power generation system and the direct-current bus to be conducted, and controlling the connection circuit between the direct-current energy storage system and the direct-current bus to be switched off.
Further, when the state of charge (SOC) of the direct current energy storage system is smaller than a preset maximum threshold value of the state of charge of the energy storage unit, the photovoltaic array and the wind generating set of the new energy power generation system are controlled to operate in a maximum power point tracking mode, and the energy storage unit of the direct current energy storage system is controlled to operate in a fluctuation stabilizing working mode.
Further, when the state of charge (SOC) of the direct current energy storage system is larger than a preset maximum threshold value of the state of charge of the energy storage unit, the photovoltaic array and the wind generating set of the new energy power generation system are controlled to operate in a non-maximum power point tracking mode.
Further, according to the real-time price of electricity of present electric wire netting, the break-make of interconnecting link between control new forms of energy power generation system and direct current energy storage system and direct current generating line includes:
when the real-time electricity price K of the current power grid is less than Kmin, if the SOC of the direct-current energy storage system is less than the preset maximum threshold of the SOC of the energy storage unit, controlling a connecting line between the new energy power generation system and the direct-current bus to be switched off, controlling the connecting line between the direct-current energy storage system and the direct-current bus to be switched on, and simultaneously supplying power to the direct-current load and the energy storage unit through the power grid;
if the SOC of the direct-current energy storage system is larger than the preset maximum threshold of the SOC of the energy storage unit, controlling a connecting line between the new energy power generation system and the direct-current bus to be switched off, controlling the connecting line between the direct-current energy storage system and the direct-current bus to be switched off, and supplying power to a direct-current load only through a power grid;
when the real-time electricity price of the current power grid meets the condition that Kmin is more than K and less than Kmax, the direct current switch is disconnected, power is supplied to a direct current load through the power grid, the SOC of the direct current energy storage system is collected, and when the SOC is more than 20% and less than 80%, the direct current energy storage system is controlled to be connected and charged through the power grid; when the SOC is more than 80% or the SOC is less than 20%, the direct-current energy storage system is disconnected; kmin and Kmax are pre-configured action electricity prices;
when the real-time electricity price K of the current power grid is larger than Kmax, controlling the direct current switch to be conducted, if the state of charge SOC of the direct current energy storage system is larger than a preset minimum threshold value of the state of charge of the energy storage unit, controlling the new energy power generation system and a connecting circuit between the direct current energy storage system and the direct current bus to be conducted, and simultaneously supplying power to the direct current load through the power grid, the new energy power generation system and the direct current energy storage system;
and if the SOC of the DC energy storage system is smaller than the preset minimum threshold value of the SOC of the energy storage unit, controlling a connecting circuit between the new energy power generation system and the DC bus to be conducted, controlling a circuit between the DC energy storage system and the DC bus to be switched off, and supplying power to the DC load through the power grid and the new energy power generation system.
Further, the preset maximum threshold value of the state of charge of the energy storage unit is 80%; the preset minimum threshold value of the state of charge of the energy storage unit is 20%.
The invention has the beneficial effects that:
the invention discloses a virtual power plant system facing a direct current load and an operation method thereof, wherein the system monitors the output power of a new energy power generation system, the charge state of a direct current energy storage system and the power required by the direct current load through an energy control system, and controls the on-off of the new energy power generation system, the direct current energy storage system, a three-phase rectifier bridge module and a direct current bus connecting circuit, thereby realizing the seamless connection of the new energy power generation system and the energy storage system with the direct current load, saving the middle power transformation link and reducing the power supply cost.
According to the method, through the energy control system, based on the power required by the direct current load and the real-time electricity of the current power grid, a direct current load electricity utilization strategy is formulated, the utilization rate of new energy is improved, and the electricity utilization cost is reduced.
Drawings
Fig. 1 is a structure diagram of a virtual power plant system facing a dc load according to embodiment 1 of the present invention;
fig. 2 is a control flow chart of a virtual power plant operation method provided in embodiment 2 of the present invention.
Detailed Description
The invention is further described below. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
The embodiment provides a virtual power plant system facing a direct current load, which is connected between a power grid and the direct current load on a load side, and comprises: the system comprises a new energy power generation system, a direct current energy storage system, an energy control system, a three-phase rectifier bridge module and a direct current electric energy meter.
The new energy power generation system is used for supplying power to the direct current load on the load side;
the direct-current energy storage system is used for exchanging energy with the direct-current bus;
the alternating current input end of the three-phase bridge rectifier module is connected with a power grid, the direct current output end of the three-phase bridge rectifier module is connected with a direct current bus, and the three-phase bridge rectifier module is used for supplying power to a direct current load on the load side by utilizing the power grid;
the direct current electric energy meter is connected with the direct current bus and the direct current load and is used for collecting the power PL required by the direct current load;
the energy control system is used for monitoring the output power of the new energy power generation system, the charge state of the direct-current energy storage system and the direct-current load required power; and the on-off control system is used for controlling the on-off of the new energy power generation system, the direct current energy storage system, the three-phase rectifier bridge module and the direct current bus connection circuit, wherein the control mode is as follows:
when the output power of the new energy power generation system is greater than the power required by the direct current load, controlling a connecting line between the three-phase rectifier bridge module and the direct current bus to be switched off, and disconnecting the power grid from the direct current load; controlling the connection and disconnection of the new energy power generation system and a connecting circuit between the direct current energy storage system and the direct current bus according to the state of charge (SOC) of the direct current energy storage system;
when the output power of the new energy power generation system is smaller than the power required by the direct current load, controlling the conduction of a connecting circuit between the three-phase rectifier bridge module and the direct current bus; and according to the real-time electricity price of the current power grid, on-off of a connecting circuit between the new energy power generation system and the direct current energy storage system and the direct current bus is controlled.
It should be noted that the new energy power generation system, the direct current energy storage system and the three-phase rectifier bridge module are all connected with the load side direct current load through the direct current bus.
It should be noted that an alternating current input end of the three-phase bridge rectifier module is connected with a 220V power grid, and a direct current output end is connected with a direct current bus.
As a preferred embodiment, the direct current energy storage system and the new energy power generation system are both connected with the direct current load through the direct current switch, and when the new energy power generation system or the direct current energy storage system has a fault or is maintained after the fault, the direct current switch is operated to switch out the new energy system or the direct current energy storage system, so that the power utilization safety is ensured. And attention is not required in a normal operation state.
In a preferred embodiment, the new energy power generation system comprises a photovoltaic power generation system and a wind power generation system,
referring to fig. 1, a photovoltaic power generation system includes one or more sets of photovoltaic arrays and unidirectional DC/DC modules;
the wind power generation system comprises a wind power generator set and a unidirectional DC/DC module;
the photovoltaic power generation system and the wind power generation system are connected with the direct current bus through the unidirectional DC/DC module so as to supply power to the direct current load on the load side.
In a preferred embodiment, the direct current energy storage system comprises one or more groups of energy storage units, a bidirectional DC/DC module and an electricity meter.
Referring to fig. 1, the energy storage unit is connected with the DC bus through the bidirectional DC/DC module for bidirectional exchange of energy with the DC bus.
The input end of the fuel gauge is connected with the energy storage unit, the output end of the fuel gauge is connected with the energy control system, and the fuel gauge is used for measuring the state of charge (SOC) of the energy storage unit.
The input end of the bidirectional DC/DC module is connected with the energy storage unit, and the output end of the bidirectional DC/DC module is connected with the direct current bus.
In a preferred embodiment, the energy storage unit may be a lithium battery energy storage unit.
In a preferred embodiment, the electricity meter continuously integrates the total current flowing into/out of the energy storage unit by means of integral measurement, and uses the net charge number obtained by integration as the residual capacity of the energy storage unit.
In a preferred embodiment, the energy control system includes a computing device having a memory function, a power harvester, and a switch controller.
The computing equipment is used for recording the real-time electricity price K of the power grid, and manually setting input action electricity prices Kmin and Kmax according to the electricity price and the new energy power generation cost, so that the decision of intelligent power utilization is influenced.
Note that, the operation electricity rate: the virtual power plant system carries out power supply price decision of power supply of a power grid or a new energy system based on load requirements and aiming at the real-time power price of the power grid. The purpose is to select the best power supply mode under the condition of not influencing the use of a user according to the current situation.
The power collector is connected with the direct current electric energy meter, the electric quantity meter of the direct current energy storage system and the output end of the new energy power generation system and used for collecting relevant data of each module, wherein the relevant data comprises load demand power PL, a state of charge SOC of an energy storage unit of the direct current energy storage system and output power Pnew of the new energy power generation system.
In order to ensure the service life of the energy storage unit of the direct current energy storage system and the stable operation of the energy storage system, the optimal state of charge SOC of the lithium battery energy storage unit is usually set to 20% to 80%.
The switch controller is connected with each unidirectional DC/DC module in the new energy power generation system, the bidirectional DC/DC module in the direct current energy storage system, the three-phase rectifier bridge module and the direct current switch and is used for controlling the connection and disconnection of the photovoltaic array, the wind generating set, the direct current energy storage system, the three-phase rectifier bridge module and the direct current switch and direct current bus connection circuit in the new energy power generation system.
The specific control mode of the switch controller is as follows:
if the SOC of the direct-current energy storage system is smaller than the preset maximum threshold of the SOC of the energy storage unit, controlling the conduction of a connecting circuit between the new energy power generation system and the direct-current bus and controlling the conduction of the connecting circuit between the direct-current energy storage system and the direct-current bus;
if the SOC quantity of the direct-current energy storage system is larger than the preset maximum threshold value of the SOC of the energy storage unit, controlling a connecting circuit between the new energy power generation system and the direct-current bus to be conducted, and controlling the connecting circuit between the direct-current energy storage system and the direct-current bus to be switched off.
When the real-time electricity price K of the current power grid is less than Kmin, if the SOC of the direct-current energy storage system is less than the preset maximum threshold of the SOC of the energy storage unit, controlling a connecting line between the new energy power generation system and the direct-current bus to be switched off, controlling the connecting line between the direct-current energy storage system and the direct-current bus to be switched on, and simultaneously supplying power to the direct-current load and the energy storage unit through the power grid;
if the SOC of the direct-current energy storage system is larger than the preset maximum threshold of the SOC of the energy storage unit, controlling a connecting line between the new energy power generation system and the direct-current bus to be switched off, controlling the connecting line between the direct-current energy storage system and the direct-current bus to be switched off, and supplying power to a direct-current load only through a power grid;
when the real-time electricity price of the current power grid meets the condition that Kmin is more than or equal to K and is less than Kmax, the direct current switch is disconnected, power is supplied to a direct current load through the power grid, the SOC of the direct current energy storage system is collected, and when the SOC is more than 20% and less than 80%, the direct current energy storage system is controlled to be connected and charged through the power grid; when the SOC is more than 80% or the SOC is less than 20%, the direct-current energy storage system is disconnected; kmin and Kmax are pre-configured action electricity prices;
when the real-time electricity price K of the current power grid is larger than Kmax, controlling the direct current switch to be conducted, if the state of charge SOC of the direct current energy storage system is larger than a preset minimum threshold value of the state of charge of the energy storage unit, controlling the new energy power generation system and the direct current energy storage system to be conducted with a connecting circuit between a direct current bus, and simultaneously supplying power to a direct current load through the power grid, the new energy power generation system and the direct current energy storage system;
and if the SOC of the DC energy storage system is smaller than the preset minimum threshold value of the SOC of the energy storage unit, controlling a connecting circuit between the new energy power generation system and the DC bus to be conducted, controlling a circuit between the DC energy storage system and the DC bus to be switched off, and supplying power to the DC load through the power grid and the new energy power generation system.
It should be noted that the input end of the unidirectional DC/DC module of the photovoltaic power generation system is connected to the photovoltaic array, the output end is connected to the power collector and the DC bus, the photovoltaic power generation system supplies power to the DC load through the DC bus, and provides real-time output power Ppv to the energy control system through the power collector; the input end of a unidirectional DC/DC module of the wind power generation system is connected with a wind power generation set, the output end of the unidirectional DC/DC module is connected with a direct current power collector and a direct current bus, the optical wind power generation system supplies power to a direct current load through the direct current bus and provides real-time output power Pwn to an energy control system through the power collector, and the total output power of the new energy power generation system is as follows: pnew = Ppv + Pwn.
Example 2
The embodiment provides a direct current load-oriented virtual power plant operation method, based on the virtual power plant system of embodiment 1, the virtual power plant system operation method includes:
the output power of the new energy power generation system, the SOC (state of charge) and the SOC of the DC energy storage system and the required power of the DC load are obtained through the power collector, and the on-off of the new energy power generation system, the DC energy storage system, the three-phase rectifier bridge module and a DC bus connecting circuit is controlled in the following mode:
when the output power of the new energy power generation system is greater than the direct current load demand power (Pnew is greater than PL), the control mode is as follows:
a. controlling a line between the three-phase rectifier bridge module and the direct current bus to be switched off, and disconnecting the power grid from the direct current load;
b. and controlling the on-off of the new energy power generation system and a circuit between the direct current energy storage system and the direct current bus according to the state of charge of the direct current energy storage system.
In this embodiment, the on-off of the new energy power generation system and the line between the dc energy storage system and the dc bus is controlled according to the state of charge of the dc energy storage system, and the specific implementation process is as shown in fig. 2, and includes:
if the SOC of the direct-current energy storage system is smaller than a preset maximum threshold value of the SOC of the energy storage unit, controlling the circuit between the new energy power generation system and the direct-current bus to be conducted, and controlling the circuit between the direct-current energy storage system and the direct-current bus to be conducted;
if the SOC of the direct-current energy storage system is larger than a preset maximum threshold value of the SOC of the energy storage unit, controlling the circuit between the new energy power generation system and the direct-current bus to be conducted, and controlling the circuit between the direct-current energy storage system and the direct-current bus to be switched off;
as a preferred embodiment, when the state of charge SOC is smaller than a preset maximum threshold of the state of charge of the energy storage unit, the photovoltaic array and the wind turbine generator set are controlled to operate in the maximum power point tracking mode, the energy storage unit of the direct current energy storage system is controlled to operate in the fluctuation stabilizing operating mode, and the redundant power of the new energy power generation system is absorbed to achieve load power balance.
In a preferred embodiment, when the state of charge SOC is greater than a preset maximum threshold value of the state of charge of the energy storage unit, the photovoltaic array and the wind generating set are controlled to operate in a non-maximum power point tracking mode.
When the output power of the new energy power generation system is smaller than the direct current load demand power (Pnew < PL), the control mode is as follows:
a. and controlling the circuit conduction between the three-phase rectifier bridge module and the direct current bus to connect the power grid with the direct current load.
b. And controlling the on-off of the circuits between the new energy power generation system and the direct current energy storage system and the direct current bus according to the real-time electricity price of the current power grid.
In this embodiment, according to the real-time electricity price of the current power grid, the on-off of the line between the new energy power generation system and the dc energy storage system and the dc bus is controlled, and the specific implementation process is as shown in fig. 2, and includes:
bl, when the real-time electricity price K of the current power grid is less than Kmin, if the SOC of the direct-current energy storage system is less than the preset maximum threshold of the SOC of the energy storage unit, controlling the line between the new energy power generation system and the direct-current bus to be switched off, controlling the line between the direct-current energy storage system and the direct-current bus to be switched on, and simultaneously supplying power to the direct-current load and the energy storage unit through the power grid;
if the SOC of the direct-current energy storage system is greater than a preset maximum threshold value of the SOC of the energy storage unit, controlling a line between the new energy power generation system and the direct-current bus to be switched off, and simultaneously controlling the line between the direct-current energy storage system and the direct-current bus to be switched off, and only supplying power to a direct-current load through a power grid;
b2, when the real-time electricity price of the current power grid meets the condition that Kmin is smaller than K and smaller than Kmax, disconnecting the direct-current switch, supplying power to the direct-current load through the power grid, collecting the SOC of the direct-current energy storage system at the moment, and controlling the direct-current energy storage system to be connected and charged through the power grid when the SOC is smaller than 20% and smaller than 80%. And when the SOC is more than 80% or the SOC is less than 20%, the direct-current energy storage system is disconnected.
b3, when the real-time electricity price K of the current power grid is larger than Kmax, controlling the direct current switch to be in a conducting state, if the SOC of the direct current energy storage system is larger than a preset minimum threshold value of the SOC of the energy storage unit, controlling the new energy power generation system and the direct current energy storage system to be in a conducting state with a line between the direct current buses, and simultaneously supplying power to the direct current load through the power grid, the new energy power generation system and the direct current energy storage system;
and if the SOC of the direct-current energy storage system is smaller than the preset minimum threshold of the SOC of the energy storage unit, controlling the circuit between the new energy power generation system and the direct-current bus to be conducted, controlling the circuit between the direct-current energy storage system and the direct-current bus to be switched off, and supplying power to a direct-current load through the power grid and the new energy power generation system.
As a preferred embodiment, the preset maximum threshold value of the state of charge of the energy storage unit is 80%; the preset minimum threshold value of the charge state of the energy storage unit is 20%.
The control of the connection/disconnection of the line between the new energy power generation system and the direct current bus refers to the control of the connection/disconnection of the line between the unidirectional DC/DC module at the output end of the photovoltaic array and the line between the unidirectional DC/DC module at the output end of the wind generating set and the direct current bus in the new energy power generation system by the switch controller.
It should be noted that, controlling the line between the DC energy storage system and the DC bus on/off means controlling the line between the bidirectional DC/DC module in the DC energy storage system and the DC bus on/off by the switch controller.
The method further includes the step of setting the operation electricity prices Kmin and Kmax in advance.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (15)

1. A dc load oriented virtual power plant system connected between a grid and a dc load on a load side, the system comprising: the system comprises a new energy power generation system, a direct-current energy storage system, an energy control system, a three-phase rectifier bridge module and a direct-current electric energy meter;
the new energy power generation system, the direct-current energy storage system and the three-phase rectifier bridge module are connected with a direct-current load on a load side through a direct-current bus; the new energy power generation system, the direct-current energy storage system, the three-phase rectifier bridge module and the direct-current electric energy meter are all connected with the energy control system;
the new energy power generation system is used for supplying power to a direct current load on a load side;
the direct-current energy storage system is used for exchanging energy with a direct-current bus;
the alternating current input end of the three-phase bridge rectifier module is connected with a power grid, and the three-phase bridge rectifier module is used for supplying power to a direct current load on a load side by utilizing the power grid;
the direct current electric energy meter is connected with the direct current bus and the direct current load and is used for collecting the power required by the direct current load;
the energy control system is used for monitoring the output power of the new energy power generation system, the state of charge (SOC) of the direct-current energy storage system and the direct-current load required power; the system is used for controlling the on-off of the new energy power generation system, the direct current energy storage system, the three-phase rectifier bridge module and a direct current bus connecting circuit; the control mode is as follows:
when the output power of the new energy power generation system is greater than the power required by the direct current load, controlling a connecting line between the three-phase rectifier bridge module and the direct current bus to be switched off, and disconnecting the power grid from the direct current load; controlling the connection and disconnection of the new energy power generation system and a connecting circuit between the direct current energy storage system and the direct current bus according to the state of charge (SOC) of the direct current energy storage system;
when the output power of the new energy power generation system is smaller than the power required by the direct current load, controlling the conduction of a connecting circuit between the three-phase rectifier bridge module and the direct current bus; and controlling the on-off of a connecting circuit between the new energy power generation system, the direct current energy storage system and the direct current bus according to the real-time electricity price of the current power grid.
2. The DC load oriented virtual power plant system of claim 1, wherein the new energy power generation system comprises a photovoltaic power generation system and a wind power generation system;
the photovoltaic power generation system comprises at least one group of photovoltaic arrays and unidirectional DC/DC modules; the input end of a unidirectional DC/DC module of the photovoltaic power generation system is connected with the photovoltaic array; the output end of a unidirectional DC/DC module of the photovoltaic power generation system is connected with a direct current bus;
the wind power generation system comprises a wind power generator set and a unidirectional DC/DC module; the input end of a unidirectional DC/DC module of the wind power generation system is connected with a wind power generator set; and the output end of the unidirectional DC/DC module of the wind power generation system is connected with a direct current bus.
3. The virtual power plant system oriented to the direct-current load according to claim 2, wherein the direct-current energy storage system and the new energy power generation system are connected with the direct-current load through a direct-current switch.
4. The virtual power plant system oriented to direct current loads according to claim 3, wherein the direct current energy storage system comprises at least one group of energy storage units, a bidirectional DC/DC module and an electricity meter;
the input end of the bidirectional DC/DC module is connected with the energy storage unit, and the output end of the bidirectional DC/DC module is connected with the direct current bus;
the input end of the fuel gauge is connected with the energy storage unit, the output end of the fuel gauge is connected with the energy control system, and the fuel gauge is used for measuring the state of charge (SOC) of the energy storage unit.
5. The DC-load-oriented virtual power plant system according to claim 4, wherein the energy storage unit is a lithium battery energy storage unit.
6. The DC-load oriented virtual power plant system according to claim 5, wherein the electricity meter is specifically configured to,
continuously integrating the total current flowing into/out of the energy storage unit;
and taking the net charge number obtained by integration as the state of charge (SOC) of the energy storage unit.
7. The DC load oriented virtual power plant system of claim 6, wherein the energy control system comprises a computing device, a power harvester and a switch controller;
the computing equipment is used for recording the real-time electricity price of the power grid and configuring the action electricity price;
the power collector is connected with the direct current electric energy meter, the electric quantity meter of the direct current energy storage system and the output end of the new energy power generation system and is used for collecting load required power, the state of charge (SOC) of the energy storage unit of the direct current energy storage system and the output power of the new energy power generation system;
the switch controller is connected with the one-way DC/DC module in the new energy power generation system, the two-way DC/DC module in the direct-current energy storage system, the three-phase rectifier bridge module and the direct-current switch, and the switch controller is used for controlling the on-off of the new energy power generation system, the direct-current energy storage system, the three-phase rectifier bridge module and a direct-current switch and direct-current bus connecting circuit.
8. The DC-load oriented virtual power plant system of claim 7, wherein the switching controller is specifically configured to,
if the SOC of the direct-current energy storage system is smaller than the preset maximum threshold of the SOC of the energy storage unit, controlling the conduction of a connecting circuit between the new energy power generation system and the direct-current bus and controlling the conduction of the connecting circuit between the direct-current energy storage system and the direct-current bus;
and if the SOC quantity of the direct-current energy storage system is larger than the preset maximum threshold value of the state of charge of the energy storage unit, controlling the connection circuit between the new energy power generation system and the direct-current bus to be conducted, and controlling the connection circuit between the direct-current energy storage system and the direct-current bus to be switched off.
9. The DC load oriented virtual power plant system of claim 7, wherein the switch controller is specifically configured to,
when the real-time electricity price K of the current power grid is less than Kmin, if the SOC of the direct-current energy storage system is smaller than the preset maximum threshold value of the SOC of the energy storage unit, controlling a connecting line between the new energy power generation system and the direct-current bus to be switched off, controlling the connecting line between the direct-current energy storage system and the direct-current bus to be switched on, and simultaneously supplying power to the direct-current load and the energy storage unit through the power grid;
if the SOC of the direct-current energy storage system is greater than the preset maximum threshold of the SOC of the energy storage unit, controlling a connecting line between the new energy power generation system and the direct-current bus to be switched off, controlling the connecting line between the direct-current energy storage system and the direct-current bus to be switched off, and supplying power to a direct-current load only through a power grid;
when the real-time electricity price of the current power grid meets the condition that Kmin is smaller than K and smaller than Kmax, the direct current switch is disconnected, power is supplied to a direct current load through the power grid, the SOC of the direct current energy storage system is collected, and when the SOC is smaller than 20% and smaller than 80%, the direct current energy storage system is controlled to be connected and charged through the power grid; when the SOC is greater than 80% or the SOC is less than 20%, disconnecting the direct-current energy storage system; kmin and Kmax are pre-configured action electricity prices;
when the real-time electricity price K of the current power grid is greater than Kmax, controlling the direct current switch to be conducted, if the state of charge SOC of the direct current energy storage system is greater than a preset minimum threshold value of the state of charge of the energy storage unit, controlling the new energy power generation system and the direct current energy storage system to be conducted with a connecting circuit between a direct current bus, and simultaneously supplying power to a direct current load through the power grid, the new energy power generation system and the direct current energy storage system;
and if the SOC of the DC energy storage system is smaller than the preset minimum threshold of the SOC of the energy storage unit, controlling the connection between the new energy power generation system and the DC bus to be conducted, controlling the line between the DC energy storage system and the DC bus to be switched off, and supplying power to the DC load through the power grid and the new energy power generation system.
10. The method for operating the virtual dc load oriented power plant system according to any one of claims 1 to 9, comprising:
acquiring output power of a new energy power generation system, a state of charge (SOC) of a direct current energy storage system and direct current load required power through a power collector; the on-off of the new energy power generation system, the direct current energy storage system and the three-phase rectifier bridge module and the direct current bus connecting circuit are controlled in the following mode:
when the output power of the new energy power generation system is greater than the power required by the direct current load, controlling a connecting line between the three-phase rectifier bridge module and the direct current bus to be switched off, and disconnecting the power grid from the direct current load; controlling the connection and disconnection of the new energy power generation system and a connecting circuit between the direct current energy storage system and the direct current bus according to the state of charge (SOC) of the direct current energy storage system;
when the output power of the new energy power generation system is smaller than the power required by the direct current load, controlling the conduction of a connecting circuit between the three-phase rectifier bridge module and the direct current bus; and controlling the on-off of a connecting circuit between the new energy power generation system, the direct current energy storage system and the direct current bus according to the real-time electricity price of the current power grid.
11. The method for operating the virtual plant system facing the direct-current load according to claim 10, wherein the controlling the connection between the new energy power generation system and the direct-current energy storage system and the direct-current bus according to the state of charge SOC of the direct-current energy storage system comprises:
if the SOC of the direct-current energy storage system is smaller than the preset maximum threshold of the SOC of the energy storage unit, controlling the conduction of a connecting circuit between the new energy power generation system and the direct-current bus and controlling the conduction of the connecting circuit between the direct-current energy storage system and the direct-current bus;
if the SOC quantity of the direct-current energy storage system is larger than the preset maximum threshold value of the SOC of the energy storage unit, controlling a connecting circuit between the new energy power generation system and the direct-current bus to be conducted, and controlling the connecting circuit between the direct-current energy storage system and the direct-current bus to be switched off.
12. The method of claim 11, wherein when the SOC of the dc energy storage system is less than a preset maximum threshold of the SOC of the energy storage unit, the pv array and the wind turbine generator set of the new energy power generation system are controlled to operate in a maximum power point tracking mode, and the energy storage unit of the dc energy storage system is controlled to operate in a fluctuation stabilizing mode.
13. The method for operating the virtual power plant system facing the direct-current load according to claim 11, wherein when the state of charge (SOC) of the direct-current energy storage system is greater than a preset maximum threshold of the SOC of the energy storage unit, the photovoltaic array and the wind generating set of the new energy power generation system are controlled to operate in a non-maximum power point tracking mode.
14. The method for operating the dc load-oriented virtual power plant system according to claim 10, wherein the controlling the connection between the new energy power generation system and the dc energy storage system and the dc bus according to the real-time electricity price of the current grid comprises:
when the real-time electricity price K of the current power grid is less than Kmin, if the state of charge SOC of the direct-current energy storage system is smaller than the preset maximum threshold value of the state of charge of the energy storage unit, controlling a connecting line between the new energy power generation system and the direct-current bus to be switched off, controlling the connecting line between the direct-current energy storage system and the direct-current bus to be switched on, and simultaneously supplying power to the direct-current load and the energy storage unit through the power grid;
if the SOC of the direct-current energy storage system is larger than the preset maximum threshold of the SOC of the energy storage unit, controlling a connecting line between the new energy power generation system and the direct-current bus to be switched off, controlling the connecting line between the direct-current energy storage system and the direct-current bus to be switched off, and supplying power to a direct-current load only through a power grid;
when the real-time electricity price of the current power grid meets the condition that Kmin is smaller than K and smaller than Kmax, the direct current switch is disconnected, power is supplied to a direct current load through the power grid, the SOC of the direct current energy storage system is collected, and when the SOC is smaller than 20% and smaller than 80%, the direct current energy storage system is controlled to be connected and charged through the power grid; when the SOC is greater than 80% or the SOC is less than 20%, disconnecting the direct-current energy storage system; kmin and Kmax are pre-configured action electricity prices;
when the real-time electricity price K of the current power grid is greater than Kmax, controlling the direct current switch to be conducted, if the state of charge SOC of the direct current energy storage system is greater than a preset minimum threshold value of the state of charge of the energy storage unit, controlling the new energy power generation system and the direct current energy storage system to be conducted with a connecting circuit between a direct current bus, and simultaneously supplying power to a direct current load through the power grid, the new energy power generation system and the direct current energy storage system;
and if the SOC of the DC energy storage system is smaller than the preset minimum threshold value of the SOC of the energy storage unit, controlling a connecting circuit between the new energy power generation system and the DC bus to be conducted, controlling a circuit between the DC energy storage system and the DC bus to be switched off, and supplying power to the DC load through the power grid and the new energy power generation system.
15. The method of operating a dc load oriented virtual power plant system according to claim 14, wherein the energy storage unit state of charge preset maximum threshold is 80%; the preset minimum threshold value of the state of charge of the energy storage unit is 20%.
CN202211299289.2A 2022-10-21 2022-10-21 Virtual power plant system facing direct current load and operation method Pending CN115622020A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113688567A (en) * 2021-08-10 2021-11-23 华北电力大学（保定） Two-stage optimal scheduling method of virtual power plant considering impact load

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113688567A (en) * 2021-08-10 2021-11-23 华北电力大学（保定） Two-stage optimal scheduling method of virtual power plant considering impact load
CN113688567B (en) * 2021-08-10 2023-08-11 华北电力大学（保定） Virtual power plant two-stage optimization scheduling method considering impact load

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