Fast suppression of chaotic oscillation of two-machine interconnected power systems

Abstract

The invention provides a fast suppression method of chaotic oscillation of a two-machine interconnected power system, which is suitable for the field of electrical engineering. According to the theoryof fixed time stability, combined with the traditional adaptive control and fast Terminal sliding mode control, a nonlinear controller is designed to make the control variable reach the neighborhoodwith arbitrarily small reference value in finite time, and the asymptotic stability of global fixed time at the equilibrium point is realized. It can stabilize the system in finite time without relying on the initial value. The stability time range can be guaranteed to have an upper bound, and the upper bound of the stability time can be calculated by the method provided by the invention; The method has strong robustness and anti-jamming ability. Under any initial conditions, the system can achieve global uniform asymptotic stability in a predetermined time, more effectively suppress the chaotic oscillation in the power system, and improve the stability of the power system.

Description

technical field [0001] The invention relates to a fast suppressing method, which is especially suitable for fast suppressing the chaotic oscillation of a double-machine interconnected power system used in the field of electrical engineering. Background technique [0002] Power system, as a typical multi-variable strongly coupled nonlinear system, exhibits a large number of nonlinear dynamic behaviors during operation, such as low-frequency oscillation, bifurcation and chaos. Especially when subjected to external disturbances, as long as the disturbance amplitude meets certain conditions, the power system will experience continuous irregular chaotic oscillations, which may lead to system instability, voltage collapse, and large-scale power outages. Therefore, it is very necessary to study the suppression method of power system chaos. The dual-machine interconnection power system is a system in which two independent power systems with generators are connected through tie line...

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Problems solved by technology

These two control methods can make the system stable in a finite time, but they are also limited by the limitation of finite time stability. The system stability is affected by the initial conditions of the system, and the initial conditions of the system are generally difficult to obtain accurate parameters in power systems.

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