Electric vehicle charging system with high power quality
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An electric vehicle and power quality technology, applied in electric vehicles, battery circuit devices, current collectors, etc., can solve problems such as affecting the power quality of the power grid, increasing capital investment, and increasing floor space.
Inactive Publication Date: 2013-04-03
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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[0003] However, the currently operating electric vehicle DC charger is composed of power electronic conversion circuits, etc., resulting in harmonic generation and low power factor, which affects the power quality of the grid
Therefore, it is necessary to invest in reactive power comp...
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[0015] figure 1 It shows the high power quality electric vehicle charging system of the present invention, which is mainly composed of power battery pack cabinet, air conditioner load, charging cabinet, charge and discharge monitoring system, background master station, leakage circuit breaker, etc. The power battery pack cabinet includes battery management system (BMS ) and high-voltage device unit, electric vehicle battery pack, DC charging interface, charging cabinet includes charging monitoring unit, DC charger, AC input and protection unit, electric energy metering device, inverter; power battery pack cabinet is connected to charge and discharge through cables The monitoring system, the battery management system (BMS) is connected to the PC through CAN to Ethernet to realize real-time monitoring of the battery, the charging monitoring unit is connected to the background master station system and the master station through Ethernet to establish a communication channel; the i...
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Abstract
The invention discloses an electric vehicle charging system with high power quality. A direct-current charger of the electric vehicle charging system is an electric vehicle charger on the basis of a voltage type PWM (pulse width modulation) rectifier, and a control system of the PWM rectifier is of a double-closed-loop control structure with a traditional outer PI (proportion integration) regulating voltage loop and an inner dead-beat control current loop. Harmonic current which is injected into a power grid by the electric vehicle charging system is reduced, and the power quality of the power grid is improved. Besides, an inverter link is added to the electric vehicle charging system, so that the electric vehicle charging system can be connected with a battery pack to charge the battery pack or can be connected with an air conditioning load for electric discharge according to load change conditions (namely a peak period, a valley period and the like) of the power grid, energy can flow in positive and negative directions, the electric vehicle charging system can run in a rectification state to receive the energy from a power-grid side, can also run in an inversion state to transmit the energy to the load, and runs in an approximate unity power factor state, and the utilization efficiency of power resources is improved.
Description
technical field [0001] The invention belongs to the field of power distribution systems, in particular to a charging system for electric vehicles with high power quality. Background technique [0002] By the end of 2011, China Southern Power Grid had built 15 charging and swapping stations and 2,953 charging piles in Guangzhou, Shenzhen, Zhuhai, Zhongshan, Nanning, Liuzhou, Guilin, Kunming, Haikou, and Zhaoqing, with a total of about 49,000 charging and swapping times. , The charging and swapping capacity is about 2.44 million kwh. At present, the Guangzhou Racecourse and Science City Electric Vehicle Exchange Station Experience Center projects are under construction as scheduled, which will play a good role in demonstration, guidance and service for the promotion and use of electric vehicles; and the State Grid Corporation has built a total of 111 electric vehicle replacement stations Power stations, 8,930 chargers, and 7,245 AC charging piles, covering 26 provinces and ci...
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IPC IPC(8): H02J7/00H02J7/02H02J3/18H02M7/72
CPCY02E40/30
Inventor 祝文姬高立克周柯吴智丁吴丽芳俞小勇李克文李珊吴剑豪
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD