Multi-target photovoltaic single-phase grid-connected capacity planning method considering three-phase imbalance

Abstract

The invention discloses a multi-target photovoltaic single-phase grid-connected capacity planning method considering three-phase imbalance, and the method employs a BP neural network model to predict and obtain PV output and load active power data in a planning year, and obtains typical scenes and scene probabilities of PV and load through a K-means clustering method improved based on a DPC algorithm. According to the output size of a PV typical scene, the PV single-phase grid-connected capacity and an output conversion matrix are obtained, and a multi-target optimization problem with the PV single-phase grid-connected access capacity as an optimization variable and with the minimum comprehensive investment and carbon emission cost, the minimum voltage deviation, the maximum static voltage stability margin and the minimum three-phase unbalance degree as targets is established. A comprehensive weight coefficient is obtained by adopting a method of combining objective weight and subjective weight, a multi-objective optimization problem is converted into a single-objective optimization problem, and finally the problem is solved by adopting an improved QPSO algorithm.

Description

technical field [0001] The present invention relates to the technology of distribution network planning, specifically a multi-objective distributed photovoltaic (Photovoltaic, PV) single-phase connection considering comprehensive investment and carbon emission costs, voltage deviation, static voltage stability margin and distribution network three-phase unbalance The capacity planning problem of the distribution network. Background technique [0002] Since the 21st century, the contradiction between economic development and environmental protection has become increasingly serious, and sustainable development has become an important goal of today's social development. In 2020, my country's coal power generation capacity will reach 4.63 trillion kWh, accounting for more than 60% of the total power generation capacity, but the power generation capacity of clean energy such as wind and wind is less than 10%. In September 2020, my country clearly put forward the "dual carbon goa...

AI Technical Summary

Problems solved by technology

The existing distribution network distributed PV capacity planning mainly considers the problem of PV three-phase grid connection at the same time, but in fact, the distributed PV on the user side is often single-phase connected, so the single-phase grid-connected capacity of distributed PV needs to be considered planning issues

Images