Power grid network topology structure changing and parallel compensation device selecting method

Abstract

The invention discloses a power grid network topology structure changing and parallel compensation device selecting method. The power grid network topology structure changing and parallel compensation device selecting method includes S1, grading input vectors; S2, simulating according to network structure parameters, load and small hydropower data, finding out the corresponding network structures and compensation modes of different running modes of a power distribution network, and obtaining several groups of training sets (X, Y) and testing sets (X', Y') of an extreme learning machine (ELM); S3, selecting the hidden layer node number combination Ls of ELM and a structural risk minimization rule constant set gamma s, and selecting an RBF function as an excitation function g(x); S4, training ELM, and testing to obtain the optimal L and gamma to obtain an optical network model of the ELM; S5, outputting the switch combination state with the minimum network loss. The power grid network topology structure changing and parallel compensation device selecting method reflects the nonlinear mapping relationship between input variable and output variable and generalization ability by the aid of ELM to build the network topology structure of which the varied load levels, small hydropower generating capacity and voltage meet demands and build the correspondence between parallel compensation modes.

Description

technical field [0001] The invention relates to a method for changing the network topology of a power grid and selecting a parallel compensation device, in particular to a method for changing the network topology and selecting a parallel compensation device based on an extreme learning machine method (ELM). Background technique [0002] As a clean, non-polluting, renewable and green energy with good ecological and social benefits, the importance of small hydropower has become increasingly prominent. In places with relatively abundant hydropower resources, the vigorous development of small hydropower not only helps to alleviate the power shortage of the power grid, but also drives the development of the local economy. After the country put forward the requirements of energy saving, emission reduction and scientific development in the new century, small hydropower has developed rapidly. [0003] However, the large-scale grid-connected power generation of small hydropower in t...

AI Technical Summary

Problems solved by technology

[0005] At present, the flexible change of the topological structure of the distribution network including small hydropower and parallel compensation can be realized by turning on and closing the switch, but when the voltage at each point of the distribution network meets the requirements as the goal, it is difficult for the conventional mathematical model to directly establish the rainfall The relationship between information, small hydro generation, load levels and the status of switches in the distribution network when the voltage meets the requirements

Images