Multi-band HVDC Transmission Additional Damping Control Method Based on Multilevel 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-band high-voltage direct current transmission additional damping control method based on multi-level linear optimal theory, belonging to the field of high-voltage direct current transmission. Background technique [0002] At present, my country has formed two major AC-DC hybrid power grids from the State Grid and the China Southern Power Grid: while grid interconnection brings significant economic and social benefits, its huge scale and complex operating characteristics also pose new challenges to the power operation department . 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 regional power grid interconnection because of its economy in long-distance large-capacity transmission and its unique fast response characteristics. With the a...

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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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