Power distribution network and micro power grid coordination optimization method based on price excitation mechanism

Abstract

The invention relates to a power distribution network and micro power grid coordination optimization method a based on a price excitation mechanism; the method comprises the following steps: building a power distribution network and micro power grid interactive mechanism: using each time period in the final transaction scheme of each micro power grid and the power distribution network exchange power as known parameters, optimizing to obtain a coordination scheduling scheme, wherein the interactive mechanism comprises micro power grid economy scheduling optimization based on day-ahead electricity price and power distribution network optimization based on the micro power grid scheduling result; in the micro power grid economy scheduling optimization aspect: building a micro power grid linearity economy scheduling model, using a linearization method to process non-linear items in said model, wherein the model contains 0 / 1 variables and each equipment output power continuous variables, and a mixed integer linear programming problem is formed. In the power distribution network micro power grid scheduling optimization aspect: obtaining the power distribution network operation cost under present day-ahead transaction electricity price according to each micro power grid economy scheduling scheme result, optimizing the day-ahead transaction electricity price of the power distribution network and each micro power grid, thus obtaining the transaction electricity price scheme with the lowest power distribution network operation cost.

Description

technical field [0001] The invention relates to a method for coordinating and optimizing a distribution network and a micro-grid, and belongs to the field of optimal dispatching of an active distribution network. Background technique [0002] With the depletion of traditional fossil energy and the aggravation of environmental pollution, the development and utilization of renewable energy to achieve sustainable economic development has become the consensus of governments of all countries. As an effective carrier for efficient use of renewable energy, microgrid technology has been vigorously developed in recent years. It is foreseeable that with the maturity and wide application of microgrid technology, the active distribution network integrated by multiple interconnected microgrids will become an important part of the future smart grid. Therefore, how to realize the coordinated operation between multiple microgrids and distribution networks, and make full use of the advantag...

AI Technical Summary

Problems solved by technology

[0004] 1) In the actual operation of the microgrid, the probability curves of uncertain variables such as load power and renewable distributed power output are difficult to obtain accurately, resulting in inaccurate final models;

[0005] 2) A large number of scenes are used to describe the uncertain variable information. Before calculation, scene reduction technology needs to be used to reasonably screen the scenes, which increases the complexity of the algorithm and increases the amount of calculation.

[0006] On the other hand, for the coordination and optimization problem of distribution network and microgrid, the current research either ignores the power flow distribution of distribution network, and does not consider the problem of power flow violation that may be caused by power exchange between microgrid and distribution network. ; or ignore the uncertainty in the microgrid and consider the economic dispatch of the microgrid with a deterministic model

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