Wind power station subsynchronous resonance suppression method and system

Abstract

The invention discloses a wind power station subsynchronous resonance suppression method and system, the wind power station at least comprises: a plurality of wind turbines, a plurality of transformers and wind power station lines, the wind power station is characterized in that: acquiring voltage signals and current signals of wind power station lines, resistance and inductance of the plurality of wind turbines, resistance and inductance of the plurality of transformers, resistance and inductance of the wind power station lines and current signals actually outputted from the subsynchronous suppression system to a power grid; performing filtering processing on voltage signals and current signals of the wind power station lines, obtaining subsynchronous frequency signals, according to the subsynchronous frequency signals, the resistance and the inductance of the plurality of wind turbines, the resistance and the inductance of the plurality of transformers and the resistance and the inductance of the wind power station lines, obtaining wind power station closed loop transfer functions, and according to the current signals actually outputted from the subsynchronous suppression system to a power grid, optimizing the attenuation rate of the closed loop transfer functions under different zero points through optimizing parameters. According to the invention, the stability of the wind power station can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a subsynchronous resonance suppression method and system for a wind farm. Background technique [0002] When wind farms are connected to systems with fixed series compensation capacitors, there may be a risk of inducing subsynchronous resonance (SSR). In recent years, there have been many accidents related to fan subsynchronous oscillation at home and abroad. In 2009, a wind farm in Texas, USA, due to a fault in the power transmission system, part of the line was cut off, which increased the series compensation from 50% to 75%, resulting in subsynchronous oscillations in the wind farm, resulting in damage to a large number of wind turbines . [0003] In related technologies, the method of suppressing the subsynchronous resonance of the wind farm is mainly to change the internal control system of the wind turbine, and increase the damping of the electromagnetic torque of t...

AI Technical Summary

Problems solved by technology

In 2009, a wind farm in Texas, USA, due to a fault in the power transmission system, part of the line was cut off, which increased the series compensation from 50% to 75%, resulting in subsynchronous oscillations in the wind farm, resulting in damage to a large number of wind turbines

However, these methods are complex and economical

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