Subsynchronous resonance TCSC (Thyristor Controlled Series Compensation) device of transmission line inhibition system

Abstract

The invention discloses a subsynchronous resonance TCSC (Thyristor Controlled Series Compensation) device of a transmission line inhibition system. The invention provides a controllable series compensation technology. A power transmission line is additionally provided with a controllable thyristor valve; a series condenser block and an inductor controlled by the thyristor valve are connected in parallel so as to form the TCSC device. The thyristor valve is a controllable element, so that the slide control over the total impedance of the TCSC device can be realized by virtue of controlling the conduction and the shutoff of a thyristor in the thyristor valve; and compared with fixed series compensation, the subsynchronous resonance of the system can be inhibited more effectively, the transmitting capacity and the transient stability of the system are improved, and the effects of reducing the linear reactance and improving the power distribution can be achieved.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution, in particular to a controllable series compensation device used for power transmission lines to suppress system subsynchronous resonance. Background technique [0002] Due to the extremely unbalanced distribution of power generation resources and geographical distribution of power loads in my country, large-capacity, long-distance power transmission and the realization of national grid interconnection will be the characteristics of the development of my country's power grid. Improving system transient stability and increasing transmission power, improving system damping, quickly suppressing oscillation after system failure, and suppressing subsynchronous resonance are the main purposes of the application of series compensation in my country. However, using a fixed series capacitor compensation technique may cause subsynchronous resonance (SSR). Slight subsynchronous r...

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Problems solved by technology

[0004] 1. Static blocking filter. In theory, static blocking filter can effectively reduce electromechanical torque interaction and transient torque amplification effect, but the disadvantage of this method is that it is expensive and occupies a large area, and its blocking effect also depends on the torque Prediction of vibration frequency and measurement of generator parameters, while the frequency of torsional vibration changes with the change of load and other conditions. If the parameters are improper, it will stimulate serious resonance

[0005] 2. Additional excitation damping control. This technology is mainly suitable for systems where the risk of subsynchronous resonance is not very large, and plays a certain auxiliary role, but for systems with a high risk of subsynchronous resonance, its effect is limited

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