System and method for providing reactive power using electric car battery

• US 8,866,438 B2
• Filed: 12/02/2011
• Issued: 10/21/2014
• Est. Priority Date: 12/03/2010
• Status: Active Grant

• Current Assignee: SK On Company Limited (SK Innovation Company Limited)
• Original Assignee: SK Innovation Company Limited
• Inventors: Yang, Jeong Hwan, Park, Sang Hyun, Lee, Kil Su
• Primary Examiner(s): Tso, Edward
• Assistant Examiner(s): BOATENG, ALEXIS ASIEDUA
• Application Number:
  US13/310,030
• Publication Number:
  US 20120139488A1
• Time in Patent Office: 1,054 Days
• Field of Search: 320/109, 320/104, 320/107, 320/137
• US Class Current: 320/109
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 3/12 Recording operating variables ; Monitoring of operating variables
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 53/22 Constructional details or arrangements of charging converters specially adapted for charging electric vehicles
• CPC Class Codes: B60L 53/63 in response to network capacity
• CPC Class Codes: B60L 53/65 involving identification of vehicles or their battery types
• CPC Class Codes: B60L 55/00 Arrangements for supplying energy stored within a vehicle to a power network, i.e. vehicle-to-grid [V2G] arrangements
• CPC Class Codes: H02J 11/00 Circuit arrangements for providing service supply to auxiliaries of stations in which electric power is generated, distributed or converted
• CPC Class Codes: H02J 3/1842 wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
• CPC Class Codes: Y02E 40/20 Active power filtering [APF]
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 : Information or communication technologies improving the operation of electric vehicles
• CPC Class Codes: Y02T 90/167 : Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: Y04S 10/126 : the energy generation units being or involving electric vehicles [EV] or hybrid vehicles [HEV], i.e. power aggregation of EV or HEV, vehicle to grid arrangements [V2G]
• CPC Class Codes: Y04S 30/14 : Details associated with the interoperability, e.g. vehicle recognition, authentication, identification or billing

Abstract

Provided are a system and a method for providing reactive power using an electric car battery, and more particularly, a system and a method for providing reactive power to a micro-grid using a bidirectional charger that is an electric car battery and an electric car charging device.

Claims

1. A system for providing reactive power using the batteries in vehicles, comprising:

a high-voltage battery for a car connected with outlets mounted in a home, the car being one of a hybrid car, a plug-in hybrid car, and an electric car;

a power factor monitoring controller mounted in the home, the power factor monitoring controller connected to the high-voltage battery through the outlets and to at least one home appliance through the outlets, the power factor monitoring controller receiving status information on the high-voltage battery generated from a battery management system (BMS) included in the car through a communication unit included in the car, the power factor monitor controller monitoring a power factor for the at least one home appliance mounted in the home and the high-voltage battery, the power factor monitoring controller calculating a power factor compensation value based on the monitored power factor;

a bidirectional charger included in the car, the bidirectional charger supplying power from a micro-grid to the high-voltage battery or sending power from the high-voltage battery to the micro-grid, the bidirectional charger including a power factor control (PFC) circuit; and

a control unit controlling, based on the status information, the bidirectional charger to send power from the high-voltage battery to the micro-grid as a leading load by an amount indicated by the calculated power factor compensation value, thereby compensating for the power as much as the power factor compensation value indicates.

2. A method for providing reactive power using the batteries in vehicles, comprising:

connecting a high-voltage battery for a car with outlets mounted in a home, the car being one of a hybrid car, a plug-in hybrid car, and an electric car;

receiving, by the power factor monitoring controller, status information on the high-voltage battery generated from a battery management system (BMS) included in the car through a communication unit included in the car;

monitoring, by the power factor monitoring controller, a power factor for at least one home appliance mounted in the home and the high-voltage battery, the power factor monitoring controller mounted in the home, the power factor monitoring controller connected to the high-voltage factor and the at least one home appliance through outlets mounted in the home;

calculating a power factor compensation value based on the monitored power factor;

supplying power from a micro-grid to the high-voltage battery or sending the power from the high-voltage battery to the micro-grid by a bidirectional charger that is an on-board charger and includes a power factor control (PFC) circuit; and

controlling, by a control unit, a bidirectional charger to send the power from the high-voltage battery to the micro-grid as a leading load by an amount corresponding to the calculated power factor compensation value, thereby compensating for the power as much as the power factor compensation value indicates.