A control method for electric vehicle group charging microgrid which is also used as emergency power supply source

Abstract

The invention discloses a control method for an electric vehicle group charging micro-network which is simultaneously used as an emergency power supply source. It takes the large-capacity energy storage array in the micro-grid as the core control object, and builds an electric vehicle group charging system that mainly serves large-scale slow charging. The specific process is as follows: charging users insert the vehicle AC charging head into the smart charging socket, and pass The connected information terminal inputs account information to the system; the electric vehicle group charging management module connects the socket to start the charging process when the account is valid and the total charging capacity does not exceed the design; the power regulation module maintains the power of the grid-connected transformer through the charge and discharge control of the energy storage array In a given range; different energy storage power levels and grid power supply states correspond to different ranges of charging interruptions. The invention supports the installation of charging sockets for 100% of the parking spaces in the area, meets the requirements of safe and reliable charging under the characteristics of simultaneous charging rate and dynamic capacity increase, and at the same time delays power outages for users when the grid is out of power, and provides long-term emergency power supply capabilities.

Description

technical field [0001] The invention belongs to the technical field of micro-distribution networks, and in particular relates to a control method for charging micro-networks of electric vehicle groups supporting safe dynamic capacity increase. Background technique [0002] Connecting distributed wind power and photovoltaic power generation units to the isolated micro-distribution network can improve the environmental protection of energy use and solve the problems of pollution and high cost caused by excessive reliance on diesel power generation. But at the same time, users are faced with the problems of intermittent power generation output and poor power quality. The above problems can be alleviated by adding an energy storage unit, but it is easy to fail to provide reliable power to users due to insufficient wind power, solar power generation or energy storage capacity, or failure of the energy storage unit. At the same time, the problem of environmental pollution cannot ...

AI Technical Summary

Problems solved by technology

The technology for connecting a high proportion of renewable energy to power generation in large-scale transmission grids is still immature and difficult to achieve in the short term, which is not conducive to the early realization of national energy conservation and emission reduction goals

[0004] Due to sudden failure of generators, intermittent wind power and photovoltaic power generation, etc., the power balance of grid power supply is easily damaged, and traditional power loads cannot respond to such power adjustment needs in a timely manner and adjust power consumption plans; when the problem is serious to a certain extent, The load power supply can only be interrupted by means of switching off and limiting power, which will bring production losses and inconvenience to power users

[0005] Because the charging power of electric vehicles is larger than that of traditional loads, it is difficult for existing power facilities to support many electric vehicles to charge slowly at the same time, and the large inrush current generated by the disorderly connection of high-power charging is also likely to damage key electrical equipment or cause damage to protective equipment. Misoperation, causing unnecessary power outages

When new large-scale commercial centers, enterprises, institutions or residential areas need to consider disorderly electric vehicle charging behavior, in order to ensure the safety of power distribution facilities, only key equipment such as transformers with large capacity can be configured, which greatly increases the investment cost

Images