Multi-band high voltage direct current power transmission supplementary damping control method based on multi-stage linear optimal theory

Abstract

The invention discloses a multi-band high voltage direct current power transmission supplementary damping control method based on a multi-stage linear optimal theory. The method is characterized in that a TLS-ESPRIT algorithm with high computational efficiency and anti-interference capacity to identify secondary synchronization and low frequency oscillation frequency and damping and a system deflation model; the multi-stage linear optimal theory control principle is combined to design an additional controller with virtual state variables; a state observer is introduced; the virtual state variables are eliminated to realize an output feedback type HVDC multi-stage linear optimal theory controller; the multi-stage linear optimal theory is used to design a multi-band stream additional damping controller; mutual influence between oscillation modes is reduced; and secondary synchronization and low frequency oscillation can be simultaneously suppressed. The method is easy and efficient. The multi-stage linear optimal theory has strong anti-interference capacity for complex and variable conditions for a real power grid. A multi-band structure is used to solve the problem of coordinated control among multiple controllers. The design method of a real large power grid controller with high operability is provided.

Description

Technical field [0001] The invention relates to a multi-frequency high-voltage direct current transmission additional damping control method based on a multi-level linear optimal theory, and belongs to the field of high-voltage direct current transmission. Background technique [0002] At present, my country has formed two AC / DC hybrid power grids from the State Grid and China Southern Power Grid. While grid interconnection brings significant economic and social benefits, its large scale and complex operating characteristics also pose new challenges to the power operation sector. . The problem of weakly damped low frequency oscillation is one of the typical challenges faced by large-scale grid interconnection. High Voltage Direct Current (HVDC) transmission technology has become an important technical solution in the interconnection of large-scale power grids due to its economy and its own unique rapid response characteristics embodied in long-distance and large-capacity transmis...

AI Technical Summary

Problems solved by technology

A multi-channel DC additional damping controller device that simultaneously suppresses subsynchronous oscillations and low-frequency oscillations has been studied (Zhao Rui, Li Xingyuan, Liu Tianqi, etc. Design of a multi-channel DC additional damping controller that suppresses subsynchronous and low-frequency oscillations[J], Electric Power Automation Equipment, 34(3):89-92), however, the robustness of the above-mentioned controller and the adaptability to the complex variability of the actual power grid are still not resolved

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