A high-proportion photovoltaic consumption method and system for low-voltage distribution network

Abstract

Embodiments of the present invention provide a high-proportion photovoltaic consumption method and system for a low-voltage distribution network, including: solving the preset optimal power flow model of the low-voltage distribution network, and obtaining the optimal power flow result corresponding to the low-voltage distribution network; The optimal power flow results optimize the low-voltage distribution network to achieve a high proportion of photovoltaic consumption in the low-voltage distribution network; among them, the objective function of the preset optimal power flow model includes the first objective function and the second objective function of the low-voltage distribution network Objective function, the first objective function is to minimize the network loss of the low-voltage distribution network, and the second objective function is to minimize the amount of photovoltaic shutdown in the low-voltage distribution network; the constraints of the preset optimal power flow model include: power flow constraints, voltage constraints, Three-phase unbalance constraints, neutral line voltage constraints, branch current constraints, photovoltaic inverter capacity constraints, energy storage constraints, and on-load tap-changer OLTC adjacent period adjustment gear constraints. A high proportion of photovoltaic consumption in the low-voltage distribution network considering the three-phase unbalance degree has been realized.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of grid-connected accommodation of photovoltaic power sources, and more specifically, to a high-proportion photovoltaic accommodation method and system for a low-voltage distribution network. Background technique [0002] With the rapid development of social economy and the continuous increase of population, conventional energy sources such as coal, oil, and natural gas are decreasing day by day. At the same time, the use of fossil energy has also led to environmental pollution and ecological imbalance, which makes the development of distributed photovoltaic power With the imminent on-site utilization, the consumption technology of high-proportion photovoltaic grid-connected in low-voltage distribution network is becoming a research trend and direction. [0003] At present, the research on the consumption capacity of distributed photovoltaics is mainly divided into three directions. The...

AI Technical Summary

Problems solved by technology

A high proportion of distributed photovoltaic grid connection will cause problems such as voltage deviation, increased network loss, and three-phase imbalance, which seriously restricts the ability of the distribution network to accommodate photovoltaics, and wastes distribution network resources and photovoltaic energy.

Images