Risk monitoring method for over-limit current protection of urban power grid including charging and discharging stations for electric vehicles

A technology for electric vehicle and current protection, applied in data processing applications, instruments, calculations, etc., can solve problems affecting the safe and economic operation of power grids
CN104182640BActive Publication Date: 2018-06-01WUHAN UNIV
3 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
WUHAN UNIV
Publication Date
2018-06-01

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention belongs to the field of power system protection and control and particularly relates to a current protection and threshold crossing risk monitoring method for an urban power grid including EV (electric vehicle) charge-discharge stations. Probability distribution of discharge powers of the EV charge-discharge stations is formed on basis of charge-discharge data information of the EV charge-discharge stations; short circuit current probability distribution of each current protector is calculated through Gram-Charlier series and a semi-invariant; a short circuit current threshold crossing severity index is calculated through a utility theory; current protection and threshold crossing risk indexes of the urban power grid including the EV charge-discharge stations are then calculated. According to the method, risk assessment is performed by a probabilistic power flow method on basis of the utility theory and a risk theory; normal current protection is effectively guaranteed for the urban power grid including EV charge-discharge stations, and the urban power grid can run safely and reliably.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the field of power system protection and control, and in particular relates to a method for monitoring the risk of over-limit current protection of an urban power grid including electric vehicle charging and discharging stations. Background technique

[0002] As a representative of new energy vehicles, electric vehicles have obvious advantages in terms of environmental protection, cleanliness, and energy saving compared with traditional vehicles powered by gasoline combustion. Electric vehicles, which represent the development direction of a new generation of energy-saving and environmentally friendly vehicles, have gradually been popularized and applied all over the world. The energy supply required for their operation is realized by the supporting charging and discharging devices and charging and discharging stations. After the electric vehicle charging and discharging station is connected to the power network as a distribute...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More