A Microgrid Frequency Regulation Control Method for Minimizing Power Generation Cost

Abstract

The present invention proposes a micro-grid frequency control method that minimizes power generation costs, which belongs to the technical field of power system operation and control. The method includes: establishing respective power generation cost functions and power generation cost micro-increase rate functions; Power output limitation constraints, and energy constraints of energy storage devices: adjust the synchronous governor of the generator and the controller of the inverter, perform frequency modulation once, perform frequency modulation twice after time intervals, collect system frequency and calculate second frequency modulation each time The total amount of active power set value adjustments is distributed to all distributed power sources or energy storage devices participating in frequency regulation, and the active power set value adjustment amount and the original set value are summed as For the new active power setting value, perform frequency modulation again to maintain the system frequency stability. The method of the invention can maximize the utilization rate of renewable energy, can improve the absorbing capacity of the microgrid renewable energy, and is convenient to realize and simple to control.

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 (Distributed Generation, 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 refe...

AI Technical Summary

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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