Active voltage control method for distribution network based on case reasoning

Abstract

A power distribution network active voltage control method based on case reasoning comprises a step of constructing a case library suitable for active distribution network voltage control and constructing a case library through an offline system simulation mode or an online feedback mode; a step of performing online monitoring of voltage of a power distribution network, and searching out N voltage control methods being the most similar when voltage of any bus of the power distribution network exceeds the boundary; and a step of performing simulation and load flow calculation of a current network condition, selecting one voltage control method which can successfully pass the online verification and has the highest similarity, applying the voltage control method to a power distribution network real-time simulation system to form closed loop control, and taking the above voltage control method as a new case to be written in the case library for reducing the similarity coefficient of voltage control methods which are failed to pass the online verification. The method provided by the invention can be applied to a real-time online monitoring control system for power distribution operation safety, provides a real-time instruction scheme for operation of the power distribution network, and also can be used as an offline calculation platform for guide operation of the power distribution network and the short-term planning.

Description

technical field [0001] The invention relates to a safe operation and preventive control method of an active distribution network. In particular, it involves a case-based reasoning method for active voltage control in distribution networks. Background technique [0002] With the economic development, the load increases year by year and the global energy conservation and emission reduction strategy continues to advance, distributed energy resources (Distributed Energy Resource, DER), especially renewable / intermittent energy, micro grid (Micro Grid, MG) and distributed storage The Energy Storage System (ESS) continues to penetrate into the distribution network, making the distribution network face more and more opportunities and challenges [1-4], mainly manifested in: the grid-connected operation of DER makes the distribution network The network becomes an active power distribution network with multi-source attributes, and the difficulty of system operation regulation will inc...

AI Technical Summary

Problems solved by technology

[0012] 1. The voltage control is often passive whether it is in normal operation or in an emergency state, and cannot provide sufficient early warning for the safety of the system operation, which does not meet the development needs of today's active distribution network;

[0013] 2. The current distribution network voltage control target is single, which cannot fully take into account a large number of external uncertain factors during the operation of the distribution network, which in turn leads to potential safety hazards in the operation of the system

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