CN113815473A - Battery replacement station with energy storage function - Google Patents
Battery replacement station with energy storage function Download PDFInfo
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- CN113815473A CN113815473A CN202110784894.8A CN202110784894A CN113815473A CN 113815473 A CN113815473 A CN 113815473A CN 202110784894 A CN202110784894 A CN 202110784894A CN 113815473 A CN113815473 A CN 113815473A
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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
- B60L53/80—Exchanging energy storage elements, e.g. removable batteries
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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
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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
- B60L53/52—Wind-driven generators
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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
- B60L53/53—Batteries
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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
- B60L55/00—Arrangements for supplying energy stored within a vehicle to a power network, i.e. vehicle-to-grid [V2G] arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
- H02J3/322—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means the battery being on-board an electric or hybrid vehicle, e.g. vehicle to grid arrangements [V2G], power aggregation, use of the battery for network load balancing, coordinated or cooperative battery charging
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- 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
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- 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
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- 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
- Y02T10/72—Electric energy management in electromobility
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- 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
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
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- 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 power exchanging station with an energy storage function, which at least comprises a plurality of energy storage converters; the voltage grade of the alternating current side of the energy storage converter is equivalent to the voltage grade of the low-voltage side of the main transformer of the power conversion station; the single energy storage converter comprises a plurality of branch DC/DC converters; each battery pack is connected with one DC/DC converter, is converted into constant voltage, is connected in parallel, and finally is converged into an energy storage converter for inversion. The bidirectional energy storage converter commonly used by the energy storage power station replaces a charger to charge the battery of the battery replacing station, and is matched with the intelligent energy management system and the scheduling and reserving battery replacing system to realize that the standby battery is utilized to feed power to the power grid in the battery replacing station and feed power to the outside at proper time, so that the power utilization stability and reliability of the battery replacing station can be greatly improved on the premise of ensuring the power replacing efficiency, and meanwhile, the bidirectional energy storage converter has the capability of providing auxiliary value-added service for the power supply power plant.
Description
Technical Field
The invention relates to the technical field of construction of power changing stations, in particular to a power changing station with an energy storage function.
Background
Lithium ion batteries and new energy electric vehicles have become mature gradually in the last decade, and are rapidly developed in China. The electric energy is a main alternative energy of future automobile vehicles, and can be obtained by converting various clean renewable energy sources such as solar energy, water energy, wind energy, nuclear energy and the like, and the dependence of the country on non-renewable energy sources such as petroleum and the like can be reduced. With the concept of environmental protection, low carbon economy and energy consumption reduction being regarded as important, the automobile industry faces increasingly serious challenges due to a series of negative effects of environmental pollution and high energy consumption caused by exhaust emission. Compared with the traditional fuel automobile, the new energy automobile can effectively reduce the exhaust gas pollution of the automobile. From the environmental point of view, the exhaust emission of new energy automobiles can be reduced by 92% -98% compared with that of the traditional automobiles, so that the diversification of traffic energy is realized, and the environment is protected; from the energy perspective, the global oil crisis is increasingly serious, the automobile industry is the largest component of energy consumption, the development and the use of new energy automobiles effectively solve the problem of heavy consumption of traffic energy, and the sustainable development of low-carbon economy is realized.
In recent years, the popularization and the application of new energy automobiles are definitely encouraged and supported at both national and local levels. The 2014 government work report clearly provides 'popularization of the new energy automobile', insists on the fact that the national strategy for developing the new energy automobile is unchanged, the main strategic orientation for developing the new energy automobile and transforming the automobile industry by pure electric drive is unchanged, the development target determined by planning is unchanged, the policy orientation supported by the government is unchanged, and the like 'four conditions are unchanged'. In order to accelerate the popularization of new energy automobiles, various governments have made relevant regulations on aspects such as vehicle purchasing subsidies, charging pile construction, new vehicle license plates and the like.
Energy supplement of the new energy electric vehicle can be divided into two modes of plug-in charging and battery replacement, wherein under the plug-in charging mode, the three problems of high initial cost for purchasing batteries, long charging time and low charging safety are mainly solved, and in addition, under the plug-in charging mode, the charging load of the new energy electric vehicle has remarkable space-time randomness, and adverse effects can be brought to the operation and planning of a power grid. The battery replacement mode is matched with large-scale centralized charging, and becomes another competitive business technology mode for the development of the current electric automobile, and firstly, the energy supply time of the electric automobile can be effectively reduced in the mode. Secondly, the charging safety can be managed in a centralized mode, and the safety and reliability of the battery system are guaranteed. Thirdly, through a reasonable commercial operation mode and by adopting a battery leasing mode, the business cost can be effectively controlled, and the traceability of the battery system can be effectively controlled in a centralized manner.
Compared with a passenger vehicle, the power exchanging station for heavy-load transportation and mining machinery exchanges power, and the construction site is often far away from the city and is located in the countryside or even the wild. The stability of a temporary power grid in a rural power grid or a construction area is poor, so that the risk of unstable voltage or power failure of a power conversion station exists; once such a situation occurs, the battery in the battery replacement station cannot be charged, and the battery replacement mechanism cannot act, so that the normal use of the battery replacement vehicle or the engineering machinery is greatly influenced. On the other hand, some large-scale electricity exchanging stations are sometimes specially built around the power plant, for example, the large-scale electricity exchanging stations are built at the side of the thermal power plant and can use low-price direct power supply of the thermal power plant; or the power grid is built near renewable energy power stations such as wind power stations and photovoltaic stations, and the use cost is reduced by using zero-cost electricity abandonment which cannot be used for surfing the Internet to a certain extent. In this case, the power conversion station needs to stabilize fluctuation of input power, and has the possibility of providing auxiliary services of peak shaving and frequency modulation for the power plant to further obtain additional benefits. For a large-scale power conversion station, a standby battery in the station is also a potential battery energy storage system with non-negligible capacity, and if the standby battery is flexibly applied, the power supply stability of the power conversion station can be improved, and even additional benefits are obtained.
The existing large-scale power change station generally uses a fixed charger to charge batteries, even if part of the batteries are intelligent chargers, the reasonable distribution of input power can be realized, the power change efficiency of a vehicle is improved and the average waiting time is reduced on the premise of ensuring the basic stability of the power load; however, the charger is a device which can provide energy in one direction, can only realize the energy flow from the power grid to the battery, and cannot be used reversely.
Therefore, how to provide a novel power conversion station with an energy storage function can greatly improve the power utilization stability and reliability of the power conversion station on the premise of ensuring the power conversion efficiency, and meanwhile, the capability of providing auxiliary value-added service for a power supply plant is a technical problem that needs to be solved urgently by technical personnel in the field.
Disclosure of Invention
The invention aims to solve one of the technical problems in the related technology at least to a certain extent, and provides a power exchange station with an energy storage function.
In view of this, the present invention provides a battery replacement station with an energy storage function, which at least includes a plurality of energy storage converters; the voltage grade of the alternating current side of the energy storage converter is equivalent to the voltage grade of the low-voltage side of the main transformer of the power conversion station; the single energy storage converter comprises a plurality of branch DC/DC converters; each battery pack is connected with one DC/DC converter, is converted into constant voltage, is connected in parallel, and finally is converged into an energy storage converter for inversion.
The power conversion station obtains power from a power grid which is close to the power conversion station through the main transformer, the voltage level of the low-voltage side of the main transformer is equivalent to the alternating current side of the energy storage converter (PCS), the energy storage converter adopts a multi-branch modular DC/DC access design scheme, each battery pack is connected with one DC/DC converter, different dynamically-variable charging/discharging powers can be distributed to different battery pack branches according to instructions, and charging/discharging strategies can be independently formulated.
In the power conversion station with the energy storage function, each energy storage converter is independently in a charging or discharging state.
In the power conversion station with the energy storage function, the power conversion station further comprises an intra-station power consumption system, and the intra-station power consumption systems are all accessed from the low-voltage side of the main transformer.
In the power conversion station with the energy storage function, the power consumption system in the station is connected to the low-voltage side of the main transformer through the transformer in the station.
According to the station-internal power consumption system, the transformer in the station is connected to the low-voltage side of the main transformer, and when the battery system discharges through the energy storage converter, the station-internal power consumption system can be supplied with priority.
The power conversion station with the energy storage function further comprises a wind power system and a photovoltaic system; the photovoltaic system is directly incorporated into a DC bus in the energy storage converter after DC/DC are connected in parallel by direct current; the wind power system is merged into an alternating current bus on the low-voltage side of the main transformer after alternating current boosting.
The power conversion station also comprises a wind power system and a photovoltaic system, and the mode is suitable for directly building photovoltaic and wind power distributed power stations around the power conversion station, and the output control of the photovoltaic system and the wind power system is uniformly controlled by the system of the power conversion station. At the moment, the photovoltaic system adopts a direct current confluence and voltage stabilization framework, and direct current is directly merged into a direct current bus in a PCS after DC/DC are connected in parallel, so that the two DC/AC conversion processes can be eliminated. In the battery pack charging mode, the power of the photovoltaic system is preferentially supplied to the battery pack for charging; in the discharging mode, the photovoltaic system and the battery pack preferentially supply power to other energy storage converters and the station power consumption system together, and the rest of power is supplied by the network. The wind power system preferentially supplies power to the energy storage converter and the station power consumption system, and the rest of the power is supplied by the network.
The battery replacement station with the energy storage function further comprises an external power supply; the external power supply comprises power station power, a wind power system and a photovoltaic system of the thermal power station, wherein the wind power system and the photovoltaic system are connected to the high-voltage side of a main transformer of the power conversion station through a renewable energy transformer to serve as a supplementary power supply; the auxiliary power of the thermal power station is directly connected to the high-voltage side of the main transformer of the power conversion station.
When the power exchanging station cannot get power from a power grid which is close to the power exchanging station through the main transformer and needs to get power from a power grid which is far away or from a power grid which is not close to the power exchanging station, the power exchanging station gets power from an external power supply. These sources are known but uncontrollable external variables that can regulate the energy flow according to the state and demand of these external sources.
In the power conversion station with the energy storage function, the power consumption system in the station includes an energy management system, a lighting and warming system, and a power conversion mechanism, wherein the energy management system includes:
the intelligent vehicle monitoring platform collects vehicle state data and analyzes and predicts the vehicle state data to obtain vehicle battery replacement time interval information; and transmitting the battery replacement time interval information;
a station control system; collecting power data of an energy storage converter and state information of a battery pack in a station, predicting a battery pack electric quantity change curve, and transmitting the battery pack electric quantity change curve;
the renewable energy source electric control system collects power prediction curves of the wind power system and the photovoltaic system and transmits the information;
the thermal power plant dispatching system collects peak shaving and frequency modulation requirements and transmits the information;
and the energy storage management system receives the battery replacement time interval information, the battery pack electric quantity change curve, the wind power system and photovoltaic system power prediction curve and peak and frequency modulation requirements transmitted by the vehicle intelligent monitoring platform, and judges and transmits a charging or discharging instruction.
The vehicle intelligent monitoring platform collects data such as position, speed and battery capacity of the battery replacement vehicle, and obtains a next battery replacement time table (interval) of each vehicle according to analysis and prediction of data of historical operation of the vehicles. The station control system collects power data of the energy storage converter and parameters of states of the battery packs in the station, such as electric quantity, temperature, health state and the like of each battery pack, and a change curve of the electric quantity of the battery in a short time in the future is simulated and predicted. The energy storage management system judges which of the current battery packs are required to be charged, can wait and needs to provide discharging service, and transmits a charging and discharging instruction to each energy storage converter to realize charging and discharging.
In the battery replacement station with the energy storage function, the vehicle intelligent monitoring platform needs to combine data of vehicle historical operation when analyzing and predicting the information of the battery replacement time interval of the vehicle.
In the power exchanging station with the energy storage function, the station control system predicts the electric quantity change curve of the battery pack and needs to combine the historical data of the battery pack.
Preferably, through the technical scheme, the invention provides the power exchanging station with the energy storage function, and the power exchanging station has the following technical effects:
1. according to the invention, a bidirectional energy storage converter (PCS) commonly used by the battery changing station replaces a charger to charge the battery of the battery changing station, and is matched with an intelligent energy management system and a scheduling reservation battery changing system to realize that the standby battery is utilized to feed power to a power grid in the battery changing station and feed power to the outside at proper time, so that the power utilization stability and reliability of the battery changing station can be greatly improved on the premise of ensuring the power changing efficiency, and meanwhile, the bidirectional energy storage converter (PCS) has the capability of providing auxiliary value-added service for a power supply plant.
2. After the battery pack and the battery replacement station are discarded, the battery pack and the battery replacement station can be continuously used as an energy storage power station, so that the construction cost and the equipment cost are greatly reduced.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is an electrical system diagram of a power swapping station provided in embodiment 1.
Fig. 2 is an electrical system diagram of a power swapping station provided in embodiment 2.
Fig. 3 is an electrical system diagram of a power swapping station provided in embodiment 3.
Fig. 4 is a schematic diagram of an energy management system of a power swapping station provided in embodiment 3.
The system comprises a main transformer 1, an external power grid 2, a thermal power plant 3, an energy storage converter 4, a battery pack 5, an in-station transformer 6, an energy management system 7, a lighting and heating system 8, a power conversion mechanism 9, a photovoltaic system 10, a wind power system 11, a renewable energy transformer 12, a vehicle intelligent monitoring platform 13, a station control system 14, a renewable energy electric control system 15, a thermal power plant dispatching system 16 and an energy storage management system 17.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Example 1
As shown in fig. 1, this embodiment provides a power conversion station with an energy storage function, which gets power from an external power grid 2 belonging to a relatively close location through a main transformer 1, and at least includes a plurality of energy storage converters 4 and an intra-station power consumption system; the voltage level of the alternating current side of the energy storage converter 4 is equivalent to the voltage level of the low-voltage side of the main transformer 1 of the power conversion station; the single energy storage converter 4 comprises a plurality of branch DC/DC converters; each battery pack 5 is connected to one path of DC/DC converter, is converted into constant voltage, is connected in parallel, and finally is merged into the energy storage converter 4 for inversion, and each energy storage converter 4 in the embodiment is independently in a charging or discharging state. For example, in the case of a short power failure, some PCS may call the connected battery pack 5 branch with idle power to discharge, so as to supply power to the power consumption system in the power station and the battery pack 5 which is suddenly charged, and charge and supplement are performed after the power grid resumes power supply. Similarly, when the power conversion station is in a relatively idle period, the battery pack 5 with an idle capacity (charge or discharge margin) can be used for performing peak clipping and valley filling service on the power grid, and performing peak-valley difference arbitrage.
The voltage grade of the low-voltage side of the main transformer 1 is equivalent to that of the alternating current side of the energy storage converter 4(PCS), the energy storage converter 4 adopts a multi-branch modular DC/DC access design scheme, each battery pack 5 is connected with one DC/DC converter, different charging/discharging powers which can be dynamically changed can be distributed to different battery pack 5 branches according to instructions, and charging/discharging strategies can be independently formulated. For example, for a battery pack 5 that is too urgent to be replaced for a vehicle, a full power charge may be allocated; for the battery pack 5 with high electric quantity and not being urgently replaced temporarily, a part of electric quantity share can be taken out to support other parts of the power conversion station to use electricity urgently or provide auxiliary service of the power grid.
The in-station power consumption system in this embodiment is accessed from the low-voltage side of the main transformer 1. If the voltage level is not matched with the energy storage converter 4, the station power consumption system can be connected to the low-voltage side of the main transformer 1 through the station transformer 6, and when the battery pack 5 discharges through the energy storage converter 4, the use of the station power consumption system can be supplemented preferentially.
The power consumption system in the station in this embodiment includes an energy management system 7, a lighting and heating system 8, and a power exchanging mechanism 9, where the energy management system 7 includes:
the vehicle intelligent monitoring platform 13 is used for collecting vehicle state data and analyzing and predicting the vehicle state data to obtain vehicle battery replacement time interval information; and transmitting the battery replacement time interval information;
a station control system 14; collecting power data of the energy storage converter 4 and state information of the battery pack 5 in the station, predicting an electric quantity change curve of the battery pack 5, and transmitting the electric quantity change curve of the battery pack 5;
and the energy storage management system 17 is used for receiving the battery replacement time interval information and the battery pack 5 electric quantity change curve transmitted by the vehicle intelligent monitoring platform 13, and judging and transmitting a charging or discharging instruction.
In this embodiment, the vehicle intelligent monitoring platform 13 collects data such as the position, speed, and battery capacity of the electric vehicles or mechanical devices such as the battery replacement weight card and the mine card, and analyzes and predicts the data of the historical operation of the vehicle to obtain a schedule (interval) of the next battery replacement of each vehicle. The station control system 14 collects power data of the energy storage converter 4 and parameters of states of the battery packs 5 in the station, such as electric quantity, temperature, health state and the like of each battery pack 5, and simulates and predicts a change curve of the battery electric quantity in a short time in the future by combining historical data. The energy storage management system 17 determines which of the current battery packs 5 should be charged, which of the current battery packs can wait and which of the current battery packs need to provide a discharging service through the vehicle battery changing time interval information and the battery pack 5 electric quantity change curve, and transmits a charging and discharging instruction to each energy storage converter 4 to realize charging and discharging.
Example 2
As shown in fig. 2, in the embodiment, a power conversion station with an energy storage function is directly built around a photovoltaic and wind power distributed power station, the output control of a photovoltaic system 10 and a wind power system 11 is uniformly governed by a system of the power conversion station, and the power conversion station in the embodiment at least comprises a plurality of energy storage converters 4, an intra-station power consumption system, a wind power system 11 and a photovoltaic system 10; the voltage level of the alternating current side of the energy storage converter 4 is equivalent to the voltage level of the low-voltage side of the main transformer 1 of the power conversion station; the single energy storage converter 4 comprises a plurality of branch DC/DC converters; each battery pack 5 is connected to one path of DC/DC converter, is converted into constant voltage, is connected in parallel, and finally is merged into the energy storage converter 4 for inversion, and each energy storage converter 4 in the embodiment is independently in a charging or discharging state. For example, in the case of a short power failure, some PCS may call the connected battery pack 5 branch with idle power to discharge, so as to supply power to the power consumption system in the power station and the battery pack 5 which is suddenly charged, and charge and supplement are performed after the power grid resumes power supply. Similarly, when the power conversion station is in a relatively idle period, the battery pack 5 with an idle capacity (charge or discharge margin) can be used for performing peak clipping and valley filling service on the power grid, and performing peak-valley difference arbitrage.
In the embodiment, the power conversion station is used for obtaining power from the external power grid 2 which is close to the power conversion station through the main transformer 1, the voltage level of the low-voltage side of the main transformer 1 is equivalent to the alternating current side of the energy storage converter 4(PCS), the energy storage converter 4 adopts a multi-branch modular DC/DC access design scheme, each battery pack 5 is accessed into one DC/DC converter, different charging/discharging powers which can be dynamically changed can be distributed to different battery pack 5 branches according to instructions, and a charging/discharging strategy can be independently formulated. For example, for a battery pack 5 that is too urgent to be replaced for a vehicle, a full power charge may be allocated; for the battery pack 5 with high electric quantity and not being urgently replaced temporarily, a part of electric quantity share can be taken out to support other parts of the power conversion station to use electricity urgently or provide auxiliary service of the power grid.
The in-station power consumption system in this embodiment is accessed from the low-voltage side of the main transformer 1. If the voltage level is not matched with the energy storage converter 4, the station power consumption system can be connected to the low-voltage side of the main transformer 1 through the station transformer 6, and when the battery pack 5 discharges through the energy storage converter 4, the use of the station power consumption system can be supplemented preferentially.
The photovoltaic system 10 in this embodiment is directly incorporated into the DC bus after DC/DC parallel connection inside the energy storage converter 4 by direct current, and at this time, the photovoltaic system 10 adopts a DC bus and voltage stabilization architecture, and is directly incorporated into the DC bus after DC/DC parallel connection inside the PCS by direct current, so that two DC/AC conversion processes can be eliminated. In the battery pack 5 charging mode, the power of the photovoltaic system 10 is supplied to the battery pack 5 preferentially for charging; in the discharging mode, the photovoltaic system 10 and the battery pack 5 preferentially supply power to other energy storage converters 4 and the station power consumption system together, and the rest of power is supplied by the network. The present embodiment can be further understood that under the condition that the battery pack 5 is fully charged and the power grid has no discharging requirement (i.e. at this time, the electric energy generated by the photovoltaic system 10 cannot be connected to the grid and cannot be used for charging), the maximum power point tracking of the photovoltaic is adjusted, and the output power of the photovoltaic is reduced.
The wind power system 11 in this embodiment is merged into the ac bus on the low-voltage side of the main transformer 1 after ac boosting. The wind power system 11 preferentially supplies power to the energy storage converter 4 and the station power consumption system, and the rest of the power is supplied by the network.
The power consumption system in the station in this embodiment includes an energy management system 7, a lighting and heating system 8, and a power exchanging mechanism 9, where the energy management system 7 includes:
the vehicle intelligent monitoring platform 13 is used for collecting vehicle state data and analyzing and predicting the vehicle state data to obtain vehicle battery replacement time interval information; and transmitting the battery replacement time interval information;
a station control system 14; collecting power data of the energy storage converter 4 and state information of the battery pack 5 in the station, predicting an electric quantity change curve of the battery pack 5, and transmitting the electric quantity change curve of the battery pack 5;
the renewable energy source electronic control system 15 is used for collecting power prediction curves of the wind power system 11 and the photovoltaic system 10 and transmitting the information;
and the energy storage management system 17 is used for receiving the battery replacement time interval information, the battery pack 5 electric quantity change curve, the wind power system 11 and the photovoltaic system 10 power prediction curve transmitted by the vehicle intelligent monitoring platform 13, judging and transmitting a charging or discharging instruction.
In this embodiment, the vehicle intelligent monitoring platform 13 collects data such as the position, speed, and battery capacity of the electric vehicles or mechanical devices such as the battery replacement weight card and the mine card, and analyzes and predicts the data of the historical operation of the vehicle to obtain a schedule (interval) of the next battery replacement of each vehicle. The station control system 14 collects power data of the energy storage converter 4 and parameters of states of the battery packs 5 in the station, such as electric quantity, temperature, health state and the like of each battery pack 5, and simulates and predicts a change curve of the battery electric quantity in a short time in the future by combining historical data. The energy storage management system 17 judges which of the current battery packs 5 should be charged, which of the current battery packs can wait and which of the current battery packs need to provide a discharging service through the vehicle battery changing time interval information, the battery pack 5 electric quantity change curve and the collected wind power system 11 and photovoltaic system 10 power prediction curve, and transmits a charging and discharging instruction to each energy storage converter 4 to realize charging and discharging.
Example 3
As shown in fig. 3, when the power exchanging station cannot get power from the external power grid 2 belonging to a relatively close location through the main transformer 1, and needs to get power from the power grid located at a relatively long distance or from the power grid not belonging to the power exchanging station, the embodiment proposes that the power exchanging station with the energy storage function gets power from an external power supply, and at least includes a plurality of energy storage converters 4, an in-station power consumption system, and an external power supply; the voltage level of the alternating current side of the energy storage converter 4 is equivalent to the voltage level of the low-voltage side of the main transformer 1 of the power conversion station; the single energy storage converter 4 comprises a plurality of branch DC/DC converters; each battery pack 5 is connected to one path of DC/DC converter, is converted into constant voltage, is connected in parallel, and finally is merged into the energy storage converter 4 for inversion, and each energy storage converter 4 in the embodiment is independently in a charging or discharging state. For example, in the case of a short power failure, some PCS may call the connected battery pack 5 branch with idle power to discharge, so as to supply power to the power consumption system in the power station and the battery pack 5 which is suddenly charged, and charge and supplement are performed after the power grid resumes power supply. Similarly, when the power conversion station is in a relatively idle period, the battery pack 5 with an idle capacity (charge or discharge margin) can be used for performing peak clipping and valley filling service on the power grid, and performing peak-valley difference arbitrage.
The voltage grade of the low-voltage side of the main transformer 1 is equivalent to that of the alternating current side of the energy storage converter 4(PCS), the energy storage converter 4 adopts a multi-branch modular DC/DC access design scheme, each battery pack 5 is connected with one DC/DC converter, different charging/discharging powers which can be dynamically changed can be distributed to different battery pack 5 branches according to instructions, and charging/discharging strategies can be independently formulated. For example, for a battery pack 5 that is too urgent to be replaced for a vehicle, a full power charge may be allocated; for the battery pack 5 with high electric quantity and not being urgently replaced temporarily, a part of electric quantity share can be taken out to support other parts of the power conversion station to use electricity urgently or provide auxiliary service of the power grid.
The in-station power consumption system in this embodiment is accessed from the low-voltage side of the main transformer 1. If the voltage level is not matched with the energy storage converter 4, the station power consumption system can be connected to the low-voltage side of the main transformer 1 through the station transformer 6, and when the battery pack 5 discharges through the energy storage converter 4, the use of the station power consumption system can be supplemented preferentially.
The external power supply in the embodiment belongs to known but uncontrollable external variables, and can regulate and control energy flow according to the states and requirements of the external power supplies, and the external power supply in the embodiment can be understood as comprising power station service power of a thermal power station, a wind power system 11 and a photovoltaic system 10, wherein the wind power system 11 and the photovoltaic system 10 are connected to the high-voltage side of a main transformer 1 of a power conversion station through a renewable energy transformer 12 to serve as a supplementary power supply; the service power of the thermal power station is directly connected to the high-voltage side of the main transformer 1 of the power switching station. And the power prediction curves of the photovoltaic system 10 and the wind power system 11 and the peak regulation and allocation requirements obtained after the thermal power plant 3 receives the power grid scheduling are transmitted to the power consumption system in the station for unified energy management.
As shown in fig. 4, the intra-station power consumption system in the present embodiment includes an energy management system 7, a lighting and heating system 8, and a power exchanging mechanism 9, where the energy management system 7 includes:
the vehicle intelligent monitoring platform 13 is used for collecting vehicle state data and analyzing and predicting the vehicle state data to obtain vehicle battery replacement time interval information; and transmitting the battery replacement time interval information;
a station control system 14; collecting power data of the energy storage converter 4 and state information of the battery pack 5 in the station, predicting an electric quantity change curve of the battery pack 5, and transmitting the electric quantity change curve of the battery pack 5;
the renewable energy source electronic control system 15 is used for collecting power prediction curves of the wind power system 11 and the photovoltaic system 10 and transmitting the information;
the thermal power plant dispatching system 16 collects peak shaving and frequency modulation requirements and transmits the information;
and the energy storage management system 17 is used for receiving the battery replacement time interval information, the battery pack 5 electric quantity change curve, the wind power system 11 and photovoltaic system 10 power prediction curve and peak and frequency modulation requirements transmitted by the vehicle intelligent monitoring platform 13, and judging and transmitting a charging or discharging instruction.
In this embodiment, the vehicle intelligent monitoring platform 13 collects data such as the position, speed, and battery capacity of the electric vehicles or mechanical devices such as the battery replacement weight card and the mine card, and analyzes and predicts the data of the historical operation of the vehicle to obtain a schedule (interval) of the next battery replacement of each vehicle. The station control system 14 collects power data of the energy storage converter 4 and parameters of states of the battery packs 5 in the station, such as electric quantity, temperature, health state and the like of each battery pack 5, and simulates and predicts a change curve of the battery electric quantity in a short time in the future by combining historical data. The energy storage management system 17 judges which of the current battery packs 5 should be charged, which can wait and which need to provide a discharging service through the vehicle battery changing time interval information, the battery pack 5 electric quantity change curve, the collected wind power system 11 and photovoltaic system 10 power prediction curve and the peak and frequency modulation requirements collected by the thermal power plant dispatching system 16, and transmits a charging and discharging instruction to each energy storage converter 4 to realize charging and discharging.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A power station with an energy storage function is characterized by at least comprising a plurality of energy storage converters; the voltage grade of the alternating current side of the energy storage converter is equivalent to the voltage grade of the low-voltage side of the main transformer of the power conversion station; the single energy storage converter comprises a plurality of branch DC/DC converters; and each battery pack is connected with one path of the DC/DC converter, is converted into constant voltage, is connected in parallel, and finally is converged into the energy storage converter for inversion.
2. The charging station as claimed in claim 1, wherein each energy storage converter is independently in a charging or discharging state.
3. The swapping station of claim 1, further comprising intra-station power consumption systems that are each accessed from a low voltage side of the main transformer.
4. The swapping station of claim 3, wherein the intra-station power consuming system is switched into the low voltage side of the main transformer through an intra-station transformer.
5. The charging station according to claim 3 or 4, further comprising a wind power system and a photovoltaic system; the photovoltaic system is directly incorporated into a DC/DC parallel direct current bus inside the energy storage converter in a direct current manner; and the wind power system is merged into an alternating current bus on the low-voltage side of the main transformer after alternating current boosting.
6. The swapping station of claim 3 or 4, further comprising an external power source; the external power supply comprises power station electricity, a wind power system and a photovoltaic system, wherein the wind power system and the photovoltaic system are connected to the high-voltage side of a main transformer of the power conversion station through a renewable energy transformer to serve as a supplementary power supply; and the auxiliary power of the thermal power station is directly connected to the high-voltage side of the main transformer of the power conversion station.
7. The power swapping station of claim 6, wherein the intra-station power consuming system comprises an energy management system, a lighting and heating system, and a power swapping mechanism, wherein the energy management system comprises:
the intelligent vehicle monitoring platform collects vehicle state data and analyzes and predicts the vehicle state data to obtain vehicle battery replacement time interval information; and transmitting the battery replacement time interval information;
a station control system; collecting power data of the energy storage converter and the state information of the battery pack in the station, predicting an electric quantity change curve of the battery pack, and transmitting the electric quantity change curve of the battery pack;
the renewable energy source electric control system collects the power prediction curves of the wind power system and the photovoltaic system and transmits the information;
the thermal power plant dispatching system collects peak shaving and frequency modulation requirements and transmits the information;
and the energy storage management system receives the battery changing time interval information, the battery pack electric quantity change curve, the wind power system and photovoltaic system power prediction curve and peak and frequency modulation requirements transmitted by the vehicle intelligent monitoring platform, and judges and transmits a charging or discharging instruction.
8. The battery replacement station according to claim 7, wherein the vehicle intelligent monitoring platform needs to combine data of vehicle historical operation when analyzing and predicting the vehicle battery replacement time interval information.
9. The swapping station of claim 7, wherein the station control system predicts the change in power of the battery pack in combination with historical data of the battery pack.
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| CN202110784894.8A CN113815473A (en) | 2021-07-12 | 2021-07-12 | Battery replacement station with energy storage function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115719995A (en) * | 2023-01-06 | 2023-02-28 | 苏州睿锂物联科技有限公司 | Power station replacing system |
| CN116476686A (en) * | 2023-06-16 | 2023-07-25 | 宁德时代新能源科技股份有限公司 | Electricity conversion system, electricity conversion system control method, control device and storage medium |
| EP4236000A1 (en) * | 2022-02-28 | 2023-08-30 | Nio Technology (Anhui) Co., Ltd | Control device and control method for power swap station |
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2021
- 2021-07-12 CN CN202110784894.8A patent/CN113815473A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4236000A1 (en) * | 2022-02-28 | 2023-08-30 | Nio Technology (Anhui) Co., Ltd | Control device and control method for power swap station |
| CN115719995A (en) * | 2023-01-06 | 2023-02-28 | 苏州睿锂物联科技有限公司 | Power station replacing system |
| CN116476686A (en) * | 2023-06-16 | 2023-07-25 | 宁德时代新能源科技股份有限公司 | Electricity conversion system, electricity conversion system control method, control device and storage medium |
| CN116476686B (en) * | 2023-06-16 | 2023-11-14 | 宁德时代新能源科技股份有限公司 | Electricity conversion system, electricity conversion system control method, control device and storage medium |
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