Calculating method for prevention and control strategy of small interference stabilization

Abstract

The invention provides a calculating method for a prevention and control strategy of small interference stabilization. Through parallel calculation of sensitivity of mode damping to operation methods, mutual relationships between low frequency oscillation mode underdamping ratios and generator power are researched, and taken as the bases for operation method adjustment, so that a scheduling aid decision for preventing and controlling the small interference under online operation conditions is realized. Economic efficiency of prevention and control is also given consideration in the calculating method, corresponding adjusting grades of power-adjusting space are divided, and minimum operation method adjusting scheme capable of increasing damping ratios can be determined by means of the parallel calculating method.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a calculation method for a small disturbance stability prevention control strategy. Background technique [0002] With the development of the power system, especially the emergence and expansion of the regional interconnected power system, the problem of small disturbance stability has become increasingly prominent. Especially in the initial stage of networking, the connection between systems is still relatively weak, and large-capacity long-distance power transmission is prone to low-frequency oscillation problems in the interconnected grid. Low-frequency oscillation poses a great threat to power supply equipment, and may even induce cascading failures, resulting in catastrophic consequences such as large-scale power outages and system disconnection. Therefore, it is of great practical significance to study the small-disturbance stability prevention and control method f...

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Problems solved by technology

This is because 1) the implementation of the damping controller usually needs to go through a long process of design, manufacture, installation and commissioning, which cannot solve the problems found and possible in the recent operation research; 2) the power exchange of the tie line is stable due to small disturbances The possibility of a damping limitation often only arises for a short period of time, and adding a new controller is not the most effective way to alleviate this problem; 3) Even if a suitable damping controller is configured, there are always some operating conditions that will exceed the controller design range, additional remedies are required to accommodate these operating conditions

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