Micro-grid frequency modulation control method with lowest power generation cost

Abstract

The invention provides a micro-grid frequency control method with the lowest power generation cost, and belongs to the technical field of electric system operation and control. The method comprises the steps that a respective power generation cost function and a power generation cost micro increasing rate function are established; active power output limit constraints of distributed power supplies and energy constraints of energy storage devices are set; and the synchronization speed regulator of a power generator and the controller of an inverter are regulated to perform primary frequency modulation, secondary frequency modulation is performed after a time interval, system frequency is acquired and active power set value total regulating amount of each time of secondary frequency modulation is calculated, the active power set value total regulating amount is allocated for all the distributed power supplies or the energy storage devices participating in frequency modulation, the active power set value regulating amount and the original set values are summated to act as a new active power set value, then one time of frequency modulation is performed again and stable system frequency can be maintained. Utilization rate of renewable energy is enabled to be the maximum by the method, and consumption capacity of micro-grid renewable energy can be enhanced. Besides, realization is convenient and control is easy.

Description

technical field [0001] The invention belongs to the technical field of power system operation and control, and particularly relates to a micro-grid frequency modulation control method capable of realizing the lowest power generation cost, which comprehensively considers the micro-grid's generation-use balance and economic scheduling issues, and ensures the stability of the micro-grid frequency while Minimize the cost of power generation, maximize the utilization of renewable energy, and rationalize power distribution. Background technique [0002] The development of distributed generation (DistributedGeneration, DG) can optimize the energy structure, promote energy conservation and emission reduction, and achieve sustainable economic development. In recent years, the distributed grid connection 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 refer...

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Problems solved by technology

However, in practice, droop control is widely used to ensure system power balance and frequency stability, which cannot achieve reasonable power distribution, and the economical efficiency of system operation is poor.

At the same time, due to the rapid changes in the primary energy and load of the microgrid, the minute-level optimal dispatch instructions of the traditional power system are not applicable, so frequency control and economic dispatch should be considered in the same process. cannot be well resolved in

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