Method for optimizing parameters of supplementary sub-synchronous damping controller for high-voltage direct-current transmission

Abstract

The invention discloses a method for optimizing parameters of a supplementary sub-synchronous damping controller for high-voltage direct-current transmission and belongs to the technical field of high-voltage transmission. The method comprises calculating the observable degree and the controllable degree of each sub-synchronous oscillating mode of a shaft system on the basis of modal analysis of the shaft system of a turbine generator unit, and coordinating and optimizing the amplification factor of each mode in the multi-mode sub-synchronous damping controller for high-voltage direct-current transmission on the basis of utilizing a lead-lag link for phase correction to effectively suppress multi-mode sub-synchronous oscillation of the turbine generator unit, which is caused by high-voltage direct-current transmission. By means of the method, effective damping control can be provided when multi-mode sub-synchronous oscillation happens to the turbine generator unit, and the safety of shaft systems of large turbine generator units can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of high-voltage power transmission, and in particular relates to a method for optimizing parameters of a high-voltage direct current transmission additional subsynchronous oscillation damping controller. Especially in relation to power system subsynchronous oscillations caused by large steam turbine generator sets in thermal power plants and high-voltage direct current transmission, a multi-mode subsynchronous oscillation damping controller parameter optimization method based on observability and controllability is provided, which is suitable for Production Practice. Background technique [0002] my country's coal resources are mainly stored in the west, while a large number of power loads are located in the east, which makes the strategy of "power transmission from west to east" a policy for my country's power development. Due to the superiority of High-Voltage Direct Current (HVDC) technology in long-dist...

AI Technical Summary

Problems solved by technology

[0004] At present, a commonly used method to suppress subsynchronous oscillation is to add a subsynchronous damping controller, which alleviates the problems caused by subsynchronous oscillation to a certain extent. After adding the subsynchronous oscillation damping controller, the torsional oscillation of the shaft system still occurs, and even cracks appear in the shaft system of the generator set, which exposes the problems of the current subsynchronous damping controller, such as poor suppression effect and lack of efficient parameter design.

Images