Multichannel robustness damping control method based on static state H-infinite loop shaping method

Abstract

The invention discloses a multichannel robustness damping control method based on a static state H-infinite loop shaping method; the multichannel robustness damping control method comprises the following steps: adding a robustness damping controller to simultaneously control subsynchronous oscillations and low frequency oscillations; using a solve linearity matrix inequality to directly solve the controller; using the total least square rotation constant technology to identify a system oscillation modal and a reduced-order model; using a Butterworth band pass filter to decompose different oscillation modals into a plurality of channels; using the static state H-infinite loop shaping method to design different robustness damping controllers for different channels, thus reducing mutual influences between the controllers. Compared with a conventional proportion-integration-differential (PID) controller, the multichannel robustness damping control method has better control effect, can simultaneously control the subsynchronous oscillation and low frequency oscillation, and has better robustness; in addition, the controller is low in order, and output feedback is employed, so engineering practice is easy; the multichannel robustness damping control method is small in computational complexity and low in algorithm complexity.

Description

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AI Technical Summary

Benefits of technology

This patented technology improves upon existing methods such as synchronization detection (SD) or phase locked loops (PLL). These improvements aimed at reducing subynchrony and lower frequency vibrations while also enhancing their overall stability over time. By adding an improved dynamic compensator called butteryfeil filters with specific characteristics, these techniques can improve both efficiency and reliability during operation. Overall, it provides technical benefits like reduced complexity, increased flexibility, better control capabilities, and more efficient use of power resources compared to previous methods.

Problems solved by technology

The technical problem addressed in this patented text relates to reducing synchronization and low frequencies during Island Operation modes when both alternating current (AC)/DC signals cross over from one source to another. This can lead to instability issues that could result into damage under extreme conditions like subsynchronism and voltage sags caused by changes made across generators connected through converters. To address these concerns, various techniques have been developed for prevention purposes including adding direct current (DC), increasing capacitor voltages, modifying modulation settings, implementing advanced feedback loops with improved reliance levels, utilizing multi- channel systems containing redundant components, and developing efficient designs without excessive complexity.

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