Control method for electromobile group-charging microgrid simultaneously serving as emergency power supply

Abstract

The invention discloses a control method for an electromobile group-charging microgrid simultaneously serving as an emergency power supply. According to the control method, an electromobile group-charging system mainly serving for large-scaled slow charging is built by taking a high-capacity energy storage array as a core control object. The control method comprises the following steps of inserting a vehicle-mounted AC charging head into an intelligent charging socket by a charging user, and inputting account information to the system through a connected information terminal; leading the socket to be connected so as to start a charging process by an electromobile group-charging management module when an account is valid and the total charging capacity does not exceed the designed capacity; and maintaining the power of a network accessed transformer within a given range by a power adjustment module through charging and discharging control on the energy storage array, wherein different energy storage battery levels and different power grid supply states are in correspondence to different ranges of charging interruption. By the control method, charging sockets installed for 100% parking spaces in a region are supported, the requirement of safe and reliable charging under charging simultaneity characteristic and dynamic capacity increase is met, meanwhile, the outage of a user is delayed when a power grid is cut off, and the long-term emergency power supply capability is provided.

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

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