A control method for an electric vehicle load transfer system
A load transfer, electric vehicle technology, applied in the power network operating system integration, information technology support system, AC network voltage adjustment and other directions, can solve problems affecting the stable operation of the system, achieve dynamic adaptive balance, improve access capability, the effect of improving stability and reliability
Active Publication Date: 2020-08-18
STATE GRID CORP OF CHINA +2
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Problems solved by technology
However, if there is a communication failure in the low-voltage distribution station area in the DC network, it will affect the stable operation of the system. Therefore, it is necessary to improve the control method of the electric vehicle load transfer system so that it can meet the requirements of normal communication and failure of the system at the same time. Stable operation requirements under state
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Embodiment 1
[0026] An embodiment of the present invention controls an electric vehicle load transfer system in three areas. The electric vehicle load transfer system in the three districts is constructed based on DC networking technology, and its system architecture is as follows: figure 1As shown, it is mainly composed of three 10kV / 380V AC distribution transformers, three low-voltage distribution stations and corresponding switches. Each low-voltage distribution station area includes a front-stage AC / DC converter and a post-stage DC / DC converter connected to the front-stage AC / DC converter. The front-stage AC / DC converter controls the grid-side current and DC bus voltage. The subsequent DC / DC converter controls the charging and discharging voltage or current of the DC side. Part of the AC 380V (AC low voltage) output by each 10kV / 380V distribution transformer supplies power to traditional loads, and part of it is input to the pre-stage AC / DC converters of each low-voltage distribution ...
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The invention discloses a control method of an electric vehicle load transfer system, and belongs to the field of power electronics. Droop control based on a distribution transformation capacity proportion and available capacity limit is applied onto the electric vehicle load transfer system when communication of a low-voltage power distribution zone of the electric vehicle load transfer system is normal, random factor-based backup control is applied onto the electric vehicle load transfer system when a fault occurs in the communication of the low-voltage power distribution zone of the electric vehicle load transfer system, and the backup control further comprises backup control when a fault occurs in communication of the low-voltage power distribution zone and backup control when faults occur in communication of two or more than two low-voltage power distribution zones. By the control method, load balancing and mutual power supply under transient running conditions such as instantaneous connection an electric vehicle load on a large scale or disconnection from a distribution network can be achieved, and stable running of the electric vehicle load transfer system and optimized power supply of the electric vehicle load can be achieved when system communication is normal or is in a fault state.
Description
technical field [0001] The invention belongs to the field of power electronics and relates to a control method for a load transfer system of an electric vehicle. Background technique [0002] According to the document of the Energy Bureau, in 2020, my country will build 12,000 centralized charging and swapping stations and 4.8 million charging piles to meet the charging needs of 5 million electric vehicles nationwide. DC chargers are expected to increase rapidly at an annual growth rate of 150%. Electric vehicles are a random DC load, and a large number of electric vehicles connected to the grid will significantly affect the local load distribution. [0003] If the capacity of the low-voltage distribution station area is configured according to the capacity of the traditional load, the low-voltage distribution station area will be seriously overloaded during the charging peak of the electric vehicle; if it is configured according to the sum of the traditional load and the ma...
Claims
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IPC IPC(8): H02J3/14H02J3/06
CPCH02J3/06H02J3/14Y02B70/3225Y04S20/222
Inventor 俞拙非陈璐瑶武迪骆健朱金大
Owner STATE GRID CORP OF CHINA