Energy management method for isolated network running mode in micro network based on load interruption model

Abstract

The invention discloses an energy management method for an isolated network running mode in a micro network based on a load interruption model. In the method, aiming at the isolated network running mode, the requirements of the micro network on maintenance of internal power balance and voltage stabilization are converted into economic indexes, the detailed load interruption model is created, and the power-on time guarantee is obtained through load bidding; and distributed power management is carried out by an energy storage unit model in view of economic and technical features at the same time. With the adoption of the energy management method, the running cycle is divided into a plurality of time periods, the load levels and the distributed power start-stop states of all the time periods are determined based on current prediction at first to guarantee power balance and enough power margin, then the distributed power and the energy storage unit are subjected to output adjustment based on short-term prediction to meet voltage and tidal current constraint. The error between the current prediction and the short-term prediction is removed through two layers of coordinated optimization models. The energy management method is suitable for the isolated network running energy management in a micro network system consisting of various energy storage equipments, loads and power supplies with multiple types and proportions.

Description

technical field [0001] The invention belongs to the technical field of operation, simulation, analysis and scheduling of power systems, and in particular relates to a microgrid energy management method combining load shedding and energy storage equipment in an isolated grid operation mode. Background technique [0002] In the late 1990s, Europe and the United States successively put forward the concept of microgrid, and started related technology research and demonstration project construction. Due to the pressure of the environment and energy, Europe regards microgrids as a way of comprehensive utilization of renewable energy; after the United States has encountered many large grid accidents, microgrids are used as a supplement to the large grid to improve the security and safety of the system. stability. With the research and development of related technologies such as new energy technology, energy storage technology, protection and monitoring technology, communication te...

AI Technical Summary

Problems solved by technology

Most of the existing research focuses on the optimal scheduling of micro-grid economic operation in the grid-connected mode. Due to the power support of the grid, there is no detailed consideration of the solution to the excess power or load in the isolated grid mode; the prediction of output power based on uncontrollable power sources Sufficiently accurate assumptions, ignoring the error of the scheduling plan caused by the prediction error; only considering the optimal scheduling of active power, ignoring the specific microgrid network structure, ignoring the regulation of microgrid voltage and reactive power

Images