Method for inhibiting subsynchronous oscillation caused by wind power and thermal power binding in direct-current power transmission

Abstract

The invention discloses a method for inhibiting subsynchronous oscillation caused by wind power and thermal power binding in direct-current power transmission. The method particularly includes: by simultaneous subsynchronous oscillation of a wind power unit and a thermal power unit, respectively designing subsynchronous oscillation damping controllers of the wind power unit and the thermal power unit according to subsynchronous oscillation observation signals of the wind power unit and the thermal power unit; using the designed subsynchronous oscillation damping controllers of the wind power unit and the thermal power unit for online inhibition of subsynchronous oscillation; when the wind power unit and the thermal power unit are in simultaneous subsynchronous oscillation, comparing an amplitude of a shaft system rotation speed deviation of the wind power unit with that of the thermal power unit to determine an input sequence of the subsynchronous oscillation damping controllers of the wind power unit and the thermal power unit. In practical application of the method, subsynchronous oscillation caused by wind power and thermal power binding in high-voltage direct-current power transmission can be inhibited effectively and quickly, and system robustness is evidently improved.

Description

Technical field [0001] The invention relates to the field of high-voltage direct current transmission, in particular to a method for suppressing subsynchronous oscillations caused by wind-fire bundling through direct current transmission. Background technique [0002] Wind power has the advantages of not polluting the environment and rich in reserves. The installed capacity of wind power has been increasing in recent years. Due to the advantages of high-speed and stable wind speed, larger units available than inland wind turbines, and single-unit capacity of more than 3MW, offshore wind power energy has developed rapidly at home and abroad. At present, most researches on fans regard the fan, gearbox and rotor as a centralized mass, and use a unified inertial time constant. The research idea of ​​this unified mass is simple in structure and cannot reflect the actual dynamic characteristics of the wind turbine under fault conditions; and the unified inertial time constant cannot r...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that sub-synchronous oscillation may occur when wind power and thermal power are bundled through high-voltage direct current transmission, which seriously affects the safe and stable operation of the system, and further solves the problem in the process of suppressing sub-synchronous oscillation of wind power units and thermal power units , when the damping controllers of wind turbines and thermal power generators are attached to the main controller on the DC rectification side, the controllers may interact with each other or even form negative feedback, which will lead to further serious problems of subsynchronous oscillation

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