A primary frequency modulation control method for microgrid based on distributed Newton method

Abstract

The present disclosure provides a frequency control method for a micro-grid and a control device. The method includes: determining a middle parameter at iteration k; determining a local gradient parameter at iteration k according to the cost increment rate at iteration k, the frequency difference between iterations k and k+1, and communication coefficients; performing a quasi-Newton recursion according to the middle parameter and local gradient parameter to acquire a recursion value; determining the cost increment rate at iteration k+1 according to the recursion value; determining an adjustment value of an active power according to the cost increment rate at iteration k+1; adjusting the active power according to the adjustment value if the adjustment value satisfies a constraint condition and judging whether the difference is smaller than a predetermined threshold; executing k=k+1 if yes and stopping the frequency control if no.

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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