Method for improving sub-synchronous oscillation (SSO) damping of thermal power plant by utilizing fan supplementary controller

Abstract

The invention belongs to the field of electric power systems, and in particular relates to a method for improving the subsynchronous oscillation damping of a thermal power unit in a wind-fire bundling and series compensation delivery system by using an additional controller to modulate the reactive output of a wind power unit. The present invention is based on the decoupling control principle of active power and reactive power of the rotor current of the doubly-fed wind turbine, and introduces the shaft speed deviation of the bundled thermal power unit as the characteristic signal to design a damping controller, and the output of the damping controller is the modulation component of the rotor reactive power control ; Through the adjustment of the reactive power of the wind turbine, the effect of enhancing the subsynchronous oscillation damping of the bundling thermal power unit is achieved. Applying the present invention to the scene of large-capacity wind-fire bundled series capacitance compensation compensation can improve the sub-synchronous oscillation damping characteristics of thermal power units, and ensure the safe, continuous and reliable delivery of new energy power and the safe and stable operation of the power system.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a method for improving subsynchronous oscillation (Subsynchronous Oscillation, SSO) damping of a grid-connected thermal power unit by using an additional controller for a fan. Background technique [0002] The potential of wind energy utilization is huge. The total exploitable installed capacity of land and offshore wind energy reaches about 700-1.2 billion kilowatts, and the latest assessment report puts forward data that can even reach more than 2.5 billion kilowatts. With the large-scale development of wind farms, the level of research, manufacture and application of wind turbines is also constantly developing, from constant-speed wind turbines with low utilization efficiency of wind energy in the past to variable-speed constant-frequency wind turbines that pursue the maximum conversion efficiency of wind energy. Among them, the megawatt-level wind turbine based on do...

AI Technical Summary

Problems solved by technology

[0004] Bundling wind and heat and sending them in series will increase the threat of subsynchronous oscillation of thermal power units at the sending end while improving the new energy delivery capacity and transmission efficiency. and adversely affect the safe and stable operation of the power grid

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