Real-time distributed economic dispatching method suitable for grid-connected microgrid

Abstract

The invention discloses a real-time distributed economic dispatching method suitable for a grid-connected microgrid. The method comprises the steps: a microgrid economic dispatching model is built with the minimum total operation cost of a microgrid system as a target according to the active balance equality constraint of the grid-connected microgrid system and the inequality constraint of the active output limitation of each unit; when only the equality constraint is considered, an optimization problem containing the equality constraint is converted into an extreme value problem of a Lagrangian function by utilizing a Lagrangian multiplier method; according to the extreme value condition of the extreme value problem, it can be known that the micro-increment rates of all the units are equal to the necessary condition for obtaining the minimum value in economic dispatching of the microgrid, each unit serves as an agent, and iteration is conducted through the consistency algorithm of theagents; a leader agent is set at a PCC to measure the deviation between the actual power and the reference power in real time, a cost micro-increment rate reference value is output, and sent to eachagent as a consistency tracking variable; the effective power of each unit is calculated according to the cost micro-increment rate, amplitude limiting output is conducted according to the active constraint of each unit, and finally the total power generation cost is calculated. The method not only solves the problem that the centralized control mode cannot meet the plug-and-play requirement of adistributed power supply, but also avoids the situation that the global information needs to be known when the active balance constraint of the microgrid is processed by the existing distributed economic dispatching algorithm.

Description

technical field [0001] The invention belongs to the technical field of optimal scheduling of micro-grid systems, and in particular relates to a real-time distributed economic scheduling method suitable for grid-connected micro-grids. Background technique [0002] In recent years, with the increasingly serious global energy crisis and environmental problems, distributed power generation technology has been widely and rapidly developed. In order to solve the integration problem of distributed power generation and large power grid, the concept of microgrid came into being. The establishment of a microgrid will bring many benefits to users, among which economic benefits are the most important reason for designing and constructing a microgrid and applying it to users. Improve the economy of system operation as much as possible. [0003] At present, the centralized microgrid economic dispatch strategy requires each controlled object to send status information to the centralized c...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a real-time distributed economic scheduling method suitable for grid-connected microgrids, which not only solves the problem that the centralized control mode cannot meet the "plug and play" of distributed power "Required problems, and also avoid the situation that the existing distributed economic dispatch algorithm must know the global information when dealing with the active power balance constraints of the microgrid

Images