Distributed Newton method based primary frequency modulation control method of microgrid

Abstract

The invention proposes a distributed Newton method based primary frequency modulation control method of a microgrid, and belongs to the technical field of running and control of a power system. The method comprises the following steps of building respective power generation cost function and power generation cost tiny-increasing rate function of each distributed power generation unit; setting an active power output restriction constraint of the distributed power generation unit; exchanging power generation cost tiny-increasing rate information of adjacent distributed power supplies; carrying out Newton iteration by an outer ring iteration method so that power generation cost tiny-increasing rate of power balance and minimum power generation can be figured out, wherein in each iteration step, each distributed power generation unit is used for calculating a Newton direction approximate to the step according to inner ring recurrence and information exchange between adjacent units, so that necessary information is provided for outer ring iteration. According to the method, second-order convergence of the distributed Newton method is fully utilized, primary frequency modulation of the microgrid is rapidly achieved, and the frequency is stabilized; and meanwhile, the minimum power generation cost of the microgrid can be achieved, and the maximum renewable energy utilization rate can be achieved.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, and in particular relates to a microgrid primary frequency modulation control method based on a distributed Newton method. Background technique [0002] The development of distributed generation of renewable energy can optimize the energy structure, promote energy conservation and emission reduction, and achieve sustainable economic development. In recent years, the grid-connected distributed power generation of renewable energy has promoted the development of micro-grids, and many demonstration projects and projects of micro-grids have been established across the country. Microgrid refers to a small power generation and distribution system composed of distributed power sources, energy storage devices, energy conversion devices, related loads and monitoring and protection devices. It is an autonomous system that can realize self-control, protection and management. It c...

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Problems solved by technology

Since the central controller of the microgrid centrally collects the information of the distributed generation units, performs centralized optimization calculations and uses the results as instructions to control the distributed generation units, the response speed is slow, the reliability is poor, and it will introduce obvious communication delays. Unable to meet the agility requirements of a FM

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