A Coordinated Frequency Control Method for Island Microgrids Considering Economic Characteristics

Abstract

The invention discloses an island microgrid frequency cooperative control method considering economic characteristics. The island microgrid frequency cooperative control method comprises the steps of initializing parameters, correcting weight of adjacent units, planning a controllable load response instruction, adaptively adjusting a frequency feedback coefficient, calculating an active output instruction and updating a global perception item. According to the control method, a central control unit is not required; and instead, the rapid recovery of the system frequency of the island microgrid is realized in an economic optimality way by fully depending the cooperative calculation of each unit, while the active participation of the controllable loads, the adaptive regulation of control power and elimination of measuring error are taken into consideration.

Description

technical field [0001] The invention relates to an isolated island microgrid frequency cooperative control method considering economic characteristics, and belongs to the technical field of isolated island microgrid frequency control. Background technique [0002] The island microgrid is an autonomous system capable of self-control, protection and management. At this stage, the central controller mainly controls the operation of each microsource through a dedicated communication network. With the advent of the era of "Internet +" and "Energy Internet", on the one hand, the communication network requires more openness and flexibility; on the other hand, the microgrid itself not only needs to accommodate more distributed energy sources for "plug and play" In addition, the controllable load is allowed to actively participate in the optimized operation; at the same time, economic operation is always the focus of users. The above problems are particularly evident in the frequenc...

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Problems solved by technology

However, the frequency is affected by the inertia of the system and there is a certain hysteresis. If the frequency feedback cannot be adaptively adjusted, it often needs to go through multiple oscillations to converge; and the measurement of the frequency signal is easy to introduce errors, and the strategy of this document is in the system. When the frequency is abnormal, cut off the frequency feedback signals of all units urgently. This will cause the system to develop in an uncontrolled state, and there are potential safety hazards

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