Method and system for suppressing ultra-low frequency oscillation of asynchronous sending-end power grid by using flexible DC power transmission system

Abstract

The invention provides a method and system for suppressing ultra-low frequency oscillation of an asynchronous sending-end power grid by using a flexible DC power transmission system. The method comprises the following steps: distinguishing a sending-end converter station and a receiving-end converter station in two alternating current stations, collecting a bus frequency signal of the sending-endconverter station, and further extracting an ultra-low frequency oscillation frequency signal from the bus frequency signal of the sending-end converter station; and serving the ultra-low frequency oscillation frequency signal as a power control instruction to synchronize power amplitude sent to the receiving-end converter station with phase oscillation variation of the ultra-low frequency oscillation signal so as to realize ultra-low frequency oscillation control of the sending-end converter station. By utilizing the characteristic that power of the DC external transmission is rapidly adjustable, DC power external transmission is increased in the frequency signal rising phase, and DC power external transmission is reduced in the frequency signal reducing phase, so that the problem of ultra-low frequency oscillation can be effectively suppressed.

Description

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AI Technical Summary

Benefits of technology

This patented technology helps reduce voltage fluctuations caused by high voltages during AC transmission systems that use converters with pulse width modulation (PWM) techniques for controller operation. It also improves efficiency when transmitting signals through cables due to its ability to adjust the duty cycle based on external factors like temperature or humidity levels.

Problems solved by technology

The technical problem addressed during these two stages: when there are multiple sources of electrical energy being transmitted over different types of networks (AC/DC) due to potential damage from lightning strikes or other factors like temporary surges on one line), synchronized interconnections between lines become more challenging because they introduce unstable voltages called AC signals into their respective channels. This issue becomes even worse if the system uses soft converters instead of traditional analog techniques.

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