Dynamic optimization scheduling method for active power distribution network

Abstract

The invention provides a dynamic optimization scheduling method for the active power distribution network. The method comprises steps of firstly, constructing an active and reactive coordination scheduling model of the active distribution network; secondly, refining the time scale on the basis of the active and reactive coordination scheduling model of the active power distribution network in thefirst step, setting the time interval to be 15 minutes, and solving an output plan in the scheduling period of the next four hours; and finally, establishing an ultra-short-term prediction model of renewable energy and load and an output prediction model of the controllable distributed power supply by taking the output plan as a reference value, performing adjusting by using multi-step dynamic rolling in a limited time domain at a time interval of 5 minutes, setting the rolling duration to be 15 minutes, and realizing closed-loop control through a feedback correction link.

Description

technical field [0001] The invention relates to the field of distribution network dispatching, in particular to a dynamic optimal dispatching method of an active distribution network. Background technique [0002] In recent years, due to the increasingly serious problem of environmental pollution and the depletion of traditional fossil energy such as coal and oil, countries around the world have become increasingly aware that traditional power generation models are not suitable for social development. Faced with this situation and in order to meet the supply of electric energy, clean and green power sources have been promoted in power systems around the world, such as wind power, solar power, tidal power and other renewable energy power generation technologies. These green and clean energy are mainly connected to the distribution network in the form of distributed generation (DG), so as to cope with the characteristics of scattered grid-connected points and low power generat...

AI Technical Summary

Problems solved by technology

If they cannot be reasonably regulated, it will cause unreasonable dynamic reactive power flow and frequent voltage changes in the distribution network, resulting in deterioration of under-voltage and over-voltage problems, increased operating energy loss, etc. Out of operation, which limits the access level of renewable resources and the penetration rate of distributed power, resulting in a great waste of grid resources and new energy

(2) The network access of distributed power will lead to great changes in the operation mode and structure of the power grid, and will change the power supply mode of the traditional radial distribution network with one-way power flow, resulting in changes in the load distribution and power flow direction of the system, and the emergence of two-way power flow and Difficulty in optimizing control, etc.

(3) Distributed power sources connected to the power grid according to different access methods and different voltage levels will cause problems such as asymmetric distribution network line parameters and unbalanced three-phase loads to become more significant

(4) A large number of grid-connected DGs will also cause problems such as increased short-circuit current, reduced reliability of power supply, and deterioration of power quality.

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