Design method of SVC (static var compensator) subsynchronous damping controller based on improved BBO (biogeography-based optimization) algorithm

Abstract

The invention discloses a design method of an SVC (static var compensator) subsynchronous damping controller based on an improved BBO (biogeography-based optimization) algorithm. Through the IBBO (improved biogeography-based optimization) algorithm introducing a cosine migration model, a prematurity judgment mechanism, a mutative scale chaos variation strategy and a repetitive removing operation, based on a mechanism that the IBBO algorithm combines the SVC to restrain SSO (subsynchronous oscillation), the subsynchronous damping controller is subjected to an optimization design. Therefore, the SVC subsynchronous damping controller designed by the method disclosed by the invention can greatly improve themodal damping of torsional vibration of a machine set and effectively restrain the SSO so as to ensure the safe and stable operation of the machine set and a power grid.

Description

technical field [0001] The invention relates to the technical field of safe and stable operation of electric power systems, and more particularly relates to the design of an SVC subsynchronous damping controller based on an improved BBO algorithm. Background technique [0002] In order to improve the transmission capacity of transmission lines, series capacitor compensation technology is widely used, but the subsynchronous oscillation (SSO) problem may be caused after series compensation is adopted. Subsynchronous oscillation refers to the abnormal operating state in which the electrical system and the turbogenerator set exchange significant energy at one or more oscillation frequencies lower than the synchronous frequency of the system in the power system, and endanger the dynamics of the shafting safety of the turbogenerator process. Subsynchronous oscillation belongs to the oscillation instability of the system, which may directly cause serious damage to the rotor shafti...

AI Technical Summary

Problems solved by technology

The subsynchronous damper (SSDC) designed for subsynchronous oscillation can effectively suppress subsynchronous oscillation, but the current common controller design methods are often not well adapted to the time-varying nonlinear characteristics of power systems, making the designed The controller cannot get a good suppression effect

[0004] At present, the common SVC controllers for suppressing subsynchronous oscillation include proportional control, additional voltage control, mode separation control, etc., but the relevant parameter design methods for these controllers are quite lacking.

In "Series Compensation Line Subsynchronous Resonance Analysis and SVC Suppression Method Research" published by Zhang Zhiqiang et al. in the journal "Modern Electric Power" 2010, 27(1): 17-21, SVC uses a proportional controller to suppress subsynchronous oscillation, but does not provide and controller design

In the "Theory and Practice of Using SVC to Suppress Subsynchronous Resonance of Generators" published in the journal "High Voltage Technology" 2007,33(3):26-30, Zhang Fan et al. mentioned that SVC uses an additional voltage controller to suppress subsynchronous oscillation. but did not give a design

Therefore, there is no better SVC controller design method to suppress SSO

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