Grid-connected AC/DC hybrid microgrid system capacity optimal configuration method in consideration of flexible loads

Abstract

The invention discloses a grid-connected AC / DC hybrid microgrid system capacity optimal configuration method in consideration of flexible loads, and belongs to the field of DC hybrid microgrid systemdesign and planning. The method comprises establishing an AC / DC hybrid microgrid system model; executing an AC / DC hybrid microgrid energy management strategy in consideration of flexible loads so as to maximize the operating cost of the AC / DC hybrid microgrid, and allocating the dispatching resources of the AC / DC-side flexible loads and a large power grid so as to maximize the operating income, and dispatching the AC / DC-side flexible loads by using an AC / DC-side flexible load dispatching method; and establishing a the capacity optimal configuration scheme of the AC / DC hybrid microgrid with a comprehensive goal of optimizing the net income and the user satisfaction of the AC / DC hybrid microgrid and with evaluation indexes including a comprehensive constraint condition, a converter loss loadpower shortage rate, and power supply reliability. The flexible loads can flexibly and actively participate in the microgrid operation control, effectively reduce thes battery capacity required for power balance, and effectively increases the microgrid operation net income.

Description

technical field [0001] The invention relates to the field of design and planning of a DC hybrid micro-grid system, in particular to a grid-connected AC-DC hybrid micro-grid system capacity optimization configuration method considering flexible loads. Background technique [0002] Coal is a non-renewable primary energy source, and a large amount of harmful gas produced during the combustion of fossil raw materials has become an important factor that aggravates environmental pollution and energy depletion. As a large energy country with coal as the main raw material, in order to enable the rapid and healthy development of the social economy, how to change the mode of production and take a sustainable development path has become the general trend. [0003] In recent years, the AC-DC hybrid microgrid system is one of the main research hotspots in the current microgrid direction. Through the rational use of energy on both sides of the AC and DC, the utilization rate of renewable ...

AI Technical Summary

Problems solved by technology

Due to the high investment cost and replacement cost of the energy storage system, if the battery is used to balance the power balance on both sides of the AC and DC supply and demand, it will not only greatly increase the investment cost of the system, but also increase the operating time of the AC-DC hybrid microgrid. On the load side, the current traditional rigid load greatly reduces the flexibility of the operation of the micro-grid system, and the direct coordination relationship between source-network-load-storage is poor. Will increase the number of energy storage devices in the microgrid

Images