CN110601334B - Charging station and energy dispatching management method thereof - Google Patents

Charging station and energy dispatching management method thereof Download PDF

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Publication number
CN110601334B
CN110601334B CN201910726517.1A CN201910726517A CN110601334B CN 110601334 B CN110601334 B CN 110601334B CN 201910726517 A CN201910726517 A CN 201910726517A CN 110601334 B CN110601334 B CN 110601334B
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power
charging station
load
energy storage
storage unit
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CN110601334A (en
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贾甜
甘江华
单栋梁
孟凡提
齐晓祥
牛高远
张臻
李红岩
张亚平
付月灵
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Xuji Power Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/50—Charging stations characterised by energy-storage or power-generation means
    • B60L53/51—Photovoltaic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/50—Charging stations characterised by energy-storage or power-generation means
    • B60L53/53—Batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/63—Monitoring or controlling charging stations in response to network capacity
    • 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
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by 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
    • 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
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations

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

Abstract

The invention provides a charging station and an energy scheduling management method thereof, wherein the power utilization time period of one day is divided into a power utilization valley time period, a power utilization ordinary time period and a power utilization peak time period, different power utilization scheduling management strategies are set in different time periods, so that the energy scheduling management control of the charging station is more accurate, the energy scheduling management strategies of the charging station are adjusted in time according to the energy level of the charging station and the load level of the charging station, the operating efficiency of the charging station is optimized, the normal operation of the charging station can be met, the load power utilization requirement of the charging station can be ensured, the intelligent development of a power grid is promoted, and the efficient and economic operation of the charging station is realized.

Description

Charging station and energy dispatching management method thereof
Technical Field
The invention belongs to the technical field of comprehensive energy microgrid, and particularly relates to a charging station and an energy dispatching management method thereof.
Background
The future power development mode is a transition to distributed power generation and interactive power supply distributed smart power grids, and the environmental protection and the application of renewable energy power generation are more emphasized. The light stores the charging station and is the typical scene of smart power grids technology that collects electricity generation, charging, discharge, accumulate in an organic whole, provides cleaner energy for electric automobile, in recent years under the government support rapid development. However, in the operation management process, because the change rules and trends of the power generation output and the charging load cannot be accurately mastered, all links such as light, charging, discharging, storing and the like are in a disordered state, so that the whole operation economy and efficiency cannot be well guaranteed.
In order to solve the above defects, the chinese patent application with publication number "CN 105186549A," entitled "V2G system based on dc micro grid" discloses a power transmission logic of a photovoltaic power generation unit, a storage battery pack and a power grid, but the method has a relatively rough control, performs a corresponding control strategy only for load valley and load peak, and lacks control for power consumption in ordinary time, resulting in less accurate energy scheduling management of a charging station.
Disclosure of Invention
The invention aims to provide a charging station and an energy dispatching management method thereof, which are used for solving the problems that the charging station energy dispatching management method in the prior art is rough in control and not accurate enough.
In order to achieve the above object, the present invention provides a technical solution of an energy scheduling management method for a charging station:
1) dividing each day into a power utilization valley time period, a power utilization peak time period and a power utilization ordinary time period according to the fluctuation, intermittence and the regularity of the load level of a power grid of the photovoltaic system;
2) controlling the load demand power of the charging station to be provided by the power grid power in the electricity consumption valley period;
3) in the peak period of electricity utilization, the photovoltaic unit, the energy storage unit and the power grid are controlled according to a set priority sequence to supply power to the load of the charging station, wherein the priority of the photovoltaic unit is greater than that of the energy storage unit, and the priority of the energy storage unit is greater than that of the power grid;
4) judging whether the photovoltaic unit in the time period of the electricity consumption ordinary time period can generate electricity or not in the electricity consumption ordinary time period, and if the photovoltaic unit cannot generate electricity, controlling the load of the charging station to be supplied with power by the energy storage unit or the power grid preferentially; and if the photovoltaic unit can generate power in the time period, controlling the load of the charging station to be supplied with power by the photovoltaic unit preferentially.
Correspondingly, the invention provides a technical scheme of a charging station, which comprises the following steps:
the charging station comprises a photovoltaic unit, an energy storage unit and a charging station load which are all connected with a power grid, wherein the photovoltaic unit and the energy storage unit are in power supply connection with the charging station load, and the charging station further comprises an energy dispatching management system which can realize the energy dispatching management method.
The two technical schemes have the beneficial effects that: according to the invention, the electricity utilization time interval of one day is divided into the electricity utilization valley time interval, the electricity utilization ordinary time interval and the electricity utilization peak time interval, and different electricity utilization scheduling management strategies are set in different time intervals, so that the energy scheduling management control of the charging station is more accurate, the energy scheduling management strategies of the charging station are adjusted in time according to the energy level of the charging station and the load level of the charging station, the operation efficiency of the charging station is optimized, the normal operation of the charging station can be met, the load and electricity utilization requirements of the charging station can be ensured, the intelligent development of a power grid is promoted, and the efficient and economic operation of the charging station is realized.
In order to control the energy scheduling management method of the charging station more accurately, the time periods divided in the step 1) are as follows: the time from 23 hours to 6 days is the electricity consumption valley time period; the time from 6 hours to 9 hours is a first electricity usual time period; the time from 9 hours to 12 hours is the first peak period of electricity utilization; 12 to 18, the second level is a second level constant period; the time from 18 hours to 21 hours is the second peak period; the third electricity consumption ordinary period is from 21 to 23.
In order to continue discharging when the electric quantity of the energy storage unit is too low to cause damage to the energy storage unit, the power of the energy storage unit needs to be judged in the step 2), and if the power of the energy storage unit is smaller than a set value, the power grid is controlled to charge the energy storage unit.
Further, in the step 4) and the step 3), if the power of the photovoltaic unit exceeds the load demand of the charging station and the energy storage unit has a charging demand, the photovoltaic unit is controlled to charge the energy storage unit.
Further, in the step 3), if the photovoltaic unit cannot meet the load demand of the charging station, the energy storage unit and the photovoltaic unit are controlled to simultaneously supply power to the load of the charging station, and if the energy storage unit and the photovoltaic unit cannot meet the load demand of the charging station, the power grid is controlled to supply power to the load of the charging station.
Further, in the step 4), if the photovoltaic unit cannot meet the load demand of the charging station, the power grid is controlled to supply power to the load of the charging station, so as to meet the normal power consumption demand of the load of the charging station.
Specifically, in a first electricity consumption ordinary time period and a third electricity level ordinary time period, if the photovoltaic unit cannot meet the load requirement of the charging station, the power grid is controlled to supply power to the load of the charging station;
in a second electrical level period, if the photovoltaic unit cannot meet the load requirement of the charging station, firstly judging whether the power of the energy storage unit is greater than the reserved charging power (reserved charging power of the charging station load), and if so, controlling the energy storage unit to supply power to the load of the charging station; and if the current is not larger than the preset value, controlling the power grid to supply power to the load of the charging station.
Drawings
Fig. 1 is a schematic structural diagram of a light storage and charging integrated charging station according to the present invention;
fig. 2 is a schematic view of the charging scheme of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings:
charging station embodiment:
the charging station integrates light collection, charging, discharging and storing, as shown in fig. 1, the charging station comprises a photovoltaic unit, an energy storage unit and a charging station load, the photovoltaic unit is connected with a Power grid through a photovoltaic inverter, the energy storage unit is connected with the Power grid and the photovoltaic unit through a Power Conversion System (PCS), the photovoltaic unit, the energy storage unit and the Power grid are in Power supply connection with the charging station load, the charging station load comprises charging equipment (such as an electric automobile) and other loads, and a charging terminal is connected with the charging equipment such as the electric automobile, so that the charging equipment such as the electric automobile and the like is charged. Because the photovoltaic unit has intermittent and fluctuating nature, the operation of charging station needs certain distribution network capacity to support, and cooperation photovoltaic unit satisfies electric automobile's the demand of charging and other power consumption demands of charging station operation, but energy storage unit two-way operation, charging terminal allows to adopt the reservation to charge.
The charging station of the embodiment further comprises an energy scheduling management system, wherein the energy scheduling management system comprises a scheduling system and a monitoring system, the scheduling system is connected with the monitoring system, the monitoring system monitors the power generation power of the photovoltaic unit and the storage power of the energy storage unit in real time, and acquires the charging demand power of the electric automobile and calculates the demand power of other loads; the scheduling system formulates a specific scheduling strategy according to the divided different time periods and the received data, and then sends the scheduling strategy to the monitoring system to dynamically adjust the running states of the photovoltaic unit, the energy storage unit, the charging terminal and the power grid.
The energy dispatching management system divides the energy dispatching management system into an electricity utilization valley time period, an electricity utilization peak time period and an electricity utilization ordinary time period every day by utilizing the bidirectionality of the energy storage system according to the fluctuation and intermittence of the photovoltaic system and the regularity of the load level of the power grid; specific energy scheduling management strategies are formulated according to three different time periods in a day, in order to control the energy of the charging station more accurately, the electricity consumption ordinary time periods are divided into a first electricity consumption ordinary time period, a second electricity consumption ordinary time period and a third electricity level ordinary time period, and the electricity consumption peak time periods are divided into a first electricity consumption peak time period and a second electricity consumption peak time period.
Specifically, each day is divided into 6 time periods, wherein 23 hours to 6 days correspond to electricity consumption valley time periods, 6 hours to 9 hours correspond to first electricity consumption ordinary time periods, 9 hours to 12 hours correspond to first electricity consumption peak time periods, 12 hours to 18 hours correspond to second electricity consumption ordinary time periods, 18 hours to 21 hours correspond to second electricity consumption peak time periods, and 21 hours to 23 hours correspond to third electricity consumption ordinary time periods. The division of the electricity utilization period to which each time point belongs is a preferable mode in this embodiment, and as another embodiment, the time point in one day may be divided into more time periods, or the electricity utilization period to which each time point belongs may be determined again.
In addition, the dispatching system determines the power supply sequence of the photovoltaic unit, the energy storage unit and the power grid according to the time interval, and the power of the photovoltaic unit is PPVIndicating that the power of the energy storage unit is PESIndicating that the grid power is PPGAnd (4) showing.
Monitoring system collects charging demand power P of electric automobileEVAnd calculating the power P demanded by other loadsLCollecting the power P of the current photovoltaic unitPVPower P of the energy storage unitES。
The dispatching system compares the energy source with P according to the power supply sequence and the data fed back by the monitoring systemEV、PEV+PLMaking an operation strategy of the charging station according to the relation; controlling the load demand power of the charging station to be provided by the power grid power in the electricity consumption valley period; in the peak period of electricity utilization, the photovoltaic unit, the energy storage unit and the power grid are controlled according to a set priority sequence to supply power to the load of the charging station, wherein the priority of the photovoltaic unit is greater than that of the energy storage unit, and the priority of the energy storage unit is greater than that of the power grid; judging whether the photovoltaic unit in the time period of the electricity consumption ordinary time period can generate electricity or not in the electricity consumption ordinary time period, and if the photovoltaic unit cannot generate electricity, controlling the load of the charging station to be supplied with electricity by the energy storage unit; and if the photovoltaic unit can generate power in the time period, controlling the load of the charging station to be supplied with power by the photovoltaic unit.
And the monitoring system receives the operation strategy given by the scheduling system to dynamically adjust the operation states of the photovoltaic unit, the energy storage unit, the charging terminal and the power grid.
The method comprises the following steps:
as shown in fig. 2, the control strategies of the energy scheduling management system of the charging station for different electricity utilization periods in 6 different electricity utilization periods are respectively:
1) the time period from 23 hours to 6 days next corresponds to the electricity consumption valley time period. At the moment, the power required by the charging of the electric automobile and the power consumption of other loads is provided by the power of a power grid:
a) if the energy storage unit PES＝PES-maxThe energy storage unit has no charging requirement, and the load power requirements are both the power P of the power gridPGProviding, i.e. PPG＝PEV+PL。
b) If the energy storage unit PES<PES-maxThe energy storage unit is charged, and the load power requirements are all the power P of the power gridPGProviding that the relation among the energy storage unit, the electric automobile and the load power is expressed as PPG＝PEV+PL+PES-C，PES-CThe charging power of the energy storage unit is obtained.
2) The time period from 6 hours to 9 hours corresponds to the first electricity consumption ordinary time period. The energy storage unit electric quantity is full of this moment, preferentially adopts the photovoltaic unit to charge and other load power supplies for electric automobile, when the photovoltaic unit can't satisfy the demand, needs the electric wire netting to charge and supply power for the load for electric automobile:
a)PPV>PEV+PLthe load power requirements are all photovoltaic unit power PPVProvided with, is represented by PPV＝PEV+PL。
b)PEV+PL>PPV>PEVThe photovoltaic system generates power at full load, meets the charging requirement of the electric automobile and the power requirements of other partial loads, and the power grid power P is used for meeting the requirements of the rest partial loadsPGProvided with, is represented by PPG＝PEV+PL-PPV。
c)PPV<PEVThe photovoltaic system generates power at full load to meet partial charging requirements, and the rest of the requirements are power P of the power gridPGProvided with, is represented by PPG＝PEV+PL-PPV。
3) The time period from 9 hours to 12 hours corresponds to the first peak period of electricity utilization. Preferentially adopting a photovoltaic unit to supply power to the electric automobile and other loads; when the photovoltaic unit cannot meet the charging requirement, the energy storage unit is adopted to supply power to the electric automobile and other loads; if the charging requirement can not be met, the power grid is adopted to charge the electric automobile and supply power to other loads:
a) if PPV>PEV+PLThe load power demands are all photovoltaic cells PPVProviding, if the energy storage unit has a charging requirement (the state of charge P of the energy storage unit)ES<PESMax), the energy storage unit is charged, and the charging power of the energy storage unit is PES-C＝PPV-PEV-PL(ii) a If the state of charge P of the energy storage unitES＝PES-max，PPV＝PEV+PL。
b) If PEV+PL>PPV>PEVThe photovoltaic system generates power at full load, meets the charging requirement of the electric automobile and the power requirement of part of other loads, and works as the charge state P of the energy storage unitES>PESThe rest part of the load demand at min is supplied by the energy storage unit PESProviding, discharging power P of the energy storage unitES-D＝PEV+PL-PPVWhen the state of charge P of the energy storage cellES≤PESAt min, the rest of the load demand is determined by the grid power PPGProvided is a method.
c) If PPV<PEVThe photovoltaic system generates power at full load to meet partial charging requirements, and the rest of the requirements are stored energy power PESProviding when the energy storage unit PES<PESAt min, the rest of the load demand is determined by the grid power PPGProvided is a method.
4) In the period from 12 hours to 18 hours, correspondingly in the second electricity consumption ordinary time period, the photovoltaic unit is preferentially adopted to supply electricity for the electric automobile and other loads, if the photovoltaic unit cannot meet the load requirement of the charging station, whether the power of the energy storage unit is greater than the reserved charging power is judged, and if the power of the energy storage unit is greater than the reserved charging power, the energy storage unit is controlled to supply electricity for the load of the charging station; and if the current is not larger than the preset value, controlling the power grid to supply power to the load of the charging station. At the moment, the charging requirement is low, and when the photovoltaic power is greater than the charging power of the electric automobile and other loads, the photovoltaic power charges the energy storage, and the energy storage unit stores the electric quantity for supporting the power grid in the next power consumption peak period. Specifically, the method comprises the following steps:
in the 12 th to 13 th time periods, the centralized power supply of the electric automobile in the midday appointment is considered, so that:
a)PPV>PEV+PLthe load power requirements are all photovoltaic unit power PPVProviding a reaction of PPV＝PEV+PL(ii) a If the energy storage unit has a charging requirement (the charge state P of the energy storage unit)ES<PES-max), the energy storage unit is charged, the charging power of the energy storage unit being denoted PES-C＝PPV-PEV-PL。
b)PPV≤PEV+PL，PES>Reserving charging power, generating power at full load of a photovoltaic system, and using the power P of an energy storage unit as the residual load demandESProviding that the discharge power of the energy storage unit is denoted PES-D＝PEV+PL-PPV。
c)PPV≤PEV+PL，PESThe reserved charging power is not more than the preset charging power, the photovoltaic system generates power at full load, and the rest part of load is required by the power grid power PPGProvided is a method.
Period 13-18:
a)PPV>PEV+PLload power demands are all PPVProviding a reaction of PPV＝PEV+PL(ii) a If the energy storage unit has a charging requirement (the charge state P of the energy storage unit)ES<PESmax), the energy storage unit is charged, and the charging power of the energy storage unit is represented as PES-C＝PPV-PEV-PL。
b)PEV+PL≥PPV>PEVThe photovoltaic system generates power at full load, meets the charging requirement of the electric automobile and the power requirements of other partial loads, and the power grid power P is used for meeting the requirements of the rest partial loadsPGProvided with, is represented by PPG＝PEV+PL-PPV。
c)PPV<PEVThe photovoltaic system generates power at full load to meet partial charging requirements, and the rest of the requirements are power P of the power gridPGProvided with, is represented by PPG＝PEV+PL-PPV。
5) The time period from 18 hours to 21 hours corresponds to the second electricity peak time period. Preferentially adopting a photovoltaic unit to supply power to the electric automobile and other loads; when the photovoltaic unit cannot meet the charging requirement, the energy storage unit is adopted to supply power to the electric automobile and other loads; if the charging requirement can not be met, the power grid is adopted to charge the electric automobile and supply power to other loads:
a) if PPV>PEV+PLThe load power demands are all photovoltaic cells PPVProviding, if the energy storage unit has a charging requirement (the state of charge P of the energy storage unit)ES<PESMax), the energy storage unit is charged, and the charging power of the energy storage unit is PES-C＝PPV-PEV-PL(ii) a If the state of charge P of the energy storage unitES＝PES-max，PPV＝PEV+PL。
b) If PEV+PL>PPV>PEVThe photovoltaic system generates power at full load, meets the charging requirement of the electric automobile and the power requirement of part of other loads, and works as the charge state P of the energy storage unitES>PESThe rest part of the load demand at min is supplied by the energy storage unit PESProviding, discharging power P of the energy storage unitES-D＝PEV+PL-PPVWhen the state of charge P of the energy storage cellES<PESAt min, the rest of the load demand is determined by the grid power PPGProvided is a method.
c) If PPV<PEVThe photovoltaic system generates power at full load to meet partial charging requirements, and the rest of the requirements are stored energy power PESProviding when the energy storage unit PES<PESAt min, the rest of the load demand is determined by the grid power PPGProvided is a method.
6) The period 21 to 23 corresponds to the third electricity consumption ordinary period. At the moment, in the last period before the energy storage cycle every day, the energy storage unit is preferentially adopted to charge the electric automobile and supply power to other loads, and when the energy storage unit cannot meet the power consumption requirement, the power grid is adopted to supply power.
a) Energy storage unit PES>PESMin, the load power demands are all energy storage unit power PESProviding, discharging power P of the energy storage unitES-D＝PEV+PL。
b) Energy storage unit PES<PESMin, the energy storage unit is charged when waiting for 23 hours, and the load power requirements are all the power P of the power gridPGProvided with, is represented by PPG＝PEV+PL。
The specific embodiments are given above, but the present invention is not limited to the above-described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.

Claims (7)

1. An energy scheduling management method for a charging station is characterized by comprising the following steps:
1) dividing each day into a power utilization valley time period, a power utilization peak time period and a power utilization ordinary time period according to the fluctuation, intermittence and the regularity of the load level of a power grid of the photovoltaic system; the time interval divided in the step 1) is as follows: the time from 23 hours to 6 days is the electricity consumption valley time period; the time from 6 hours to 9 hours is a first electricity usual time period; the time from 9 hours to 12 hours is the first peak period of electricity utilization; 12 to 18, the second level is a second level constant period; the time from 18 hours to 21 hours is the second peak period; the time from 21 to 23 is the third voltage level period;
2) controlling the load demand power of the charging station to be provided by the power grid power in the electricity consumption valley period;
3) in the peak period of electricity utilization, the photovoltaic unit, the energy storage unit and the power grid are controlled according to a set priority sequence to supply power to the load of the charging station, wherein the priority of the photovoltaic unit is greater than that of the energy storage unit, and the priority of the energy storage unit is greater than that of the power grid;
4) judging whether the photovoltaic unit in the time period of the electricity consumption ordinary time period can generate electricity or not in the electricity consumption ordinary time period, and if the photovoltaic unit cannot generate electricity, controlling the load of the charging station to be supplied with power by the energy storage unit or the power grid preferentially; if the photovoltaic unit can generate power in the time period, controlling the load of the charging station to be supplied with power by the photovoltaic unit preferentially;
when 12 hours to 13 hours in the second ordinary time period, if the power of the photovoltaic unit is greater than the load power requirement, the load power requirement is provided by the power of the photovoltaic unit, and at the moment, if the energy storage unit has a charging requirement, the energy storage unit is charged; if the power of the photovoltaic unit is not more than the load power requirement and the energy storage unit is more than the reserved charging power, the photovoltaic system generates electricity at full load, and the rest load power requirement is provided by the power of the energy storage unit; if the power of the photovoltaic unit is not greater than the load power demand and the power of the energy storage unit is not greater than the reserved charging power, the photovoltaic system generates power at full load, and the rest load power demand is provided by the power of the power grid.
2. The energy scheduling management method for the charging station according to claim 1, wherein the power of the energy storage unit is further determined in step 2), and if the power of the energy storage unit is smaller than a set value, the power grid is controlled to charge the energy storage unit.
3. The method for energy scheduling management of a charging station according to claim 1, wherein in the step 4) and the step 3), if the power of the photovoltaic unit exceeds the load requirement of the charging station and the energy storage unit has a charging requirement, the photovoltaic unit is controlled to charge the energy storage unit.
4. The energy scheduling management method for the charging station according to claim 1, wherein in the step 3), if the photovoltaic unit cannot meet the load requirement of the charging station, the energy storage unit and the photovoltaic unit are controlled to simultaneously supply power to the load of the charging station, and if the energy storage unit and the photovoltaic unit cannot meet the load requirement of the charging station, the power grid is controlled to supply power to the load of the charging station.
5. The method for energy dispatching management of a charging station according to claim 1, wherein in step 4), if the photovoltaic unit cannot meet the load demand of the charging station, the power grid is controlled to supply power to the load of the charging station.
6. The energy dispatching management method for the charging station according to claim 1, wherein in the step 4), in the first electricity consumption ordinary time period and the third electricity level ordinary time period, if the photovoltaic unit cannot meet the load demand of the charging station, the power grid is controlled to supply power to the load of the charging station.
7. A charging station, comprising a photovoltaic unit, an energy storage unit and a charging station load, all connected to an electrical grid, said photovoltaic unit and energy storage unit being in power supply connection with the charging station load, characterized in that the charging station further comprises an energy management and management system, said energy management and management system being capable of implementing the energy management and management method of the charging station according to any of the preceding claims 1-6.
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