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A topology and the control method of EV charging station with mV2mV

IP.com Disclosure Number: IPCOM000238135D
Publication Date: 2014-Aug-04
Document File: 11 page(s) / 2M

Publishing Venue

The IP.com Prior Art Database

Related People

Chunming Yuan: AUTHOR [+4]

Abstract

With the increased amount of electrical vehicles, EV charging stations will be necessary with various business modes. In the reference [1], the possible business modes were described, such as G2V (Grid-to-Vehicle), V2G (Vehicle-to-Grid), V2H (Vehicle-to-Home) and V2V (Vehicle-to-Vehicle). (1)V2V Mode From prior art searching, a few V2V methods and topologies were protected in two exsiting patents, which are shown in the formal document. In prior arts, the existing V2V methods are only suitable for point-to-point power exchanging, which can only be used for non-commercial occasions. With the increase of EV amount, a flexible trading platform is needed to satisfy the demand of trading power from multiple EVs to multiple EVs with fast charging function. The trading platform can be located in the EV charging station. (2)EV charging station Depending on the type of the bus bar, the existing charging stations can be defined as two types: AC bus based station and DC bus based station. For individual chargers, simplified block diagrams shown in Figure 4 are adopted to represent AC/DC and DC/DC respectively. In DC bus based station, normally a central AC/DC converter will be utilized to replace the distributed AC/DC converters in AC bus based station for efficiency improvement and capital cost saving. 1.The existing point to point V2V power exchange methods will not suitable when the amount of EV is large. A public trading platform is required to satisfy the demand of selling and purchasing electric power in EVs, which is the concept of multiple vehicles to multiple vehicles (mV2mV). 2.Actually, a trading platform is absent in the existing EV charger solutions. A highly efficient topology is also lack of a trading platform. 3.Although the existing topology of the DC bus based station can carry out the function of mV2mV, the losses of the DC bus based station must be very high because the large charging current flow via dual full power DC/DC converters. The mV2mV usually requires the fast charging function from several EVs to several EVs. Due to large current for fast charging, the existing charger station would be designed in larger capacity and results in higher losses. A topology and the related method are proposed in the ID, in which there are several features in the following: 1)The proposed topology can realize the requirements of mV2mV in an EV charging station. 2)The proposed topology can realize the low losses and low cost. 3)The fast charging of mV2mV is realized, while normal function of EV charging station is not influenced. For external benefits: 1)For charging station owner, the trading platform provides a new business mode - mV2mV with low cost and losses, which increase the competitiveness of charging station with value added service. 2)For EV owners, the surplus energy in their EV battery can be sold to others (who need the emergency power) easily and fast and thus obtain income. For ABB, the attractive solution for mV2mV can help increase ABB’s competitive strength in the EV charging station market.

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Invention Title: A topology and the control method of EV charging station with mV2mV (multiple Vehicle to multiple Vehicle) energy exchange function

This invention proposes a topology and the related control methods to realize an original energy trading platform of mV2mV (multiple EV to multiple EV) in the charging station. The proposed topology is comprised with several high efficient circuit units. By the three control modes, the topology can not only carry out the fast charging business mode of mV2mV, but also realize the normal fast charging and slow charging without any additional switches.

Abstract of the Invention

Background

With the increased amount of electrical vehicles, EV charging stations will be necessary with various business modes. In the reference [1], the possible business modes were described, such as G2V (Grid-to-Vehicle), V2G (Vehicle-to-Grid), V2H (Vehicle-to-Home) and V2V (Vehicle-to-Vehicle).

Figure 1 Possible EV Business Modes [1]

(1)   V2V Mode

From prior art searching, a few V2V methods and topologies were protected in patent [2] and [3], which are shown in Figure 2.

(a)   The V2V topology[2]                                                                     (b)  The V2V method[3]

Figure 2 Existing V2V [2] [3]

In prior arts, the existing V2V methods are only suitable for point-to-point power exchanging, which can only be used for non-commercial occasions. With the increase of EV amount, a flexible trading platform is needed to satisfy the demand of trading power from multiple EVs to multiple EVs with fast charging function. The trading platform can be located in the EV charging station.

(2)   EV charging station

Depending on the type of the bus bar, the existing charging stations can be defined as two types: AC bus based station (shown in Figure 3 (a)) and DC bus based station (shown in Figure 3 (b)). For individual chargers, simplified block diagrams shown in Figure 4 are adopted to represent AC/DC and DC/DC respectively. In DC bus based station, normally a central AC/DC converter will be utilized to replace the distributed AC/DC converters in AC bus based station for efficiency improvement and capital cost saving.

 

(a) AC bus based station                                   (b) DC bus based station

Figure 3 Typical Electrical Layout of EV Charging Station

Figure 4 Simplified Block Diagram of the Typical Circuit Configuration by CHAdeMO [3]

State of problem

1.     The existing point to point V2V power exchange methods will not suitable when the amount of EV is large. A public trading platform is required to satisfy the demand of selling and purchasing electric power in EVs, which is the concept of multiple vehicles to multiple vehicles (mV2mV).

2.     Actually, a trading platform is absent in the existing EV charger solutions. A highly efficient topology is also lack of a trading platform.

3.     Although the existing topology of...