Independent micro-grid dynamic optimization scheduling method

Abstract

The invention discloses an independent micro-grid dynamic optimization scheduling method, which comprises the following steps of: 1, establishing a long-period energy matching evaluation and optimization model for an independent micro-grid system, and formulating a diesel oil consumption plan, an energy storage system energy storage plan and a load transfer plan within expectation; comprising the following steps: establishing objective functions about reliable power supply probability, diesel consumption and load transfer amount; setting constraint conditions of an energy storage system, diesel oil consumption and load energy transfer; 2, establishing a day-ahead stochastic optimization model based on scene analysis, and making a micro-grid hourly scheduling plan in the next day; the photovoltaic and load uncertainty is processed through a multi-scene technology, and meanwhile, the scheduling risk cost caused by the photovoltaic and load uncertainty is measured by using the conditional value-at-risk CVaR; the load transfer scheme and the standby electricity demand in the long-period energy matching evaluation and optimization stage are considered; an objective function in the day-ahead stochastic optimization model is to minimize comprehensive scheduling cost, and the comprehensive scheduling cost comprises scheduling cost and risk cost; the constraint conditions comprise a power balance constraint, an energy storage operation constraint, a diesel generator operation constraint, a load transfer constraint and a standby electricity demand constraint.

Description

technical field [0001] The invention relates to the field of optimal dispatching of independent micro-grids, in particular to a dynamic optimal dispatching method of independent micro-grids considering long-period energy supply and demand balance. Background technique [0002] As a small power system integrating renewable energy and loads, microgrid has attracted more and more attention. Especially in remote areas, building a microgrid is a more economical way of power supply. However, due to the intermittency and uncertainty of renewable energy, diesel generators and energy storage systems are often equipped in independent microgrids to improve the flexibility and reliability of the system. Due to the geographical location and traffic conditions in remote areas, especially in the event of natural disasters, the fossil fuel reserves in the microgrid are limited and the replenishment cycle is long, which seriously threatens the long-term reliable operation of the microgrid. ...

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the purpose of the present invention is to overcome the shortcomings of the existing independent microgrid optimization dispatching time scale and low reliability in long-term operation. Formulate diesel consumption, energy storage system energy storage and load transfer plans in a long-term range, minimize diesel consumption and load transfer while ensuring the maximum reliability of power supply; and then consider the energy reserve after the day-ahead scheduling in the day-ahead scheduling stage Optimal day-ahead scheduling plan with constraints

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