Wide-area damping control method based on identification of power system model

Abstract

The invention relates to a wide-area damping control method based on identification of a power system model. The wide-area damping control method based on identification of the power system model includes the following steps that an observing signal is collected by means of a wide-area measuring system; pre-processing is carried out on the obtained observing signal to obtain a stable time sequence and the Bayes criterion is used for carrying out order determination on an ARMA model; an identification result is obtained by means of an improved ARMA model recognition algorithm; the time-lag power system state space model is obtained and a linear matrix inequality gamma and a linear matrix inequality theta are set up for obtaining the maximum time lag upper limit h which can be tolerated by the system and a controller K; fifthly, an output signal of the controller K is attached to a generator set excitation side which is in strong correlation with a low-frequency oscillation mode to finish damping control. According to the wide-area damping control method based on identification of the power system model, the computational process is simple, the operation speed is high, the obtained maximum time lag upper limit can meet the practical requirements and engineering realization is easy to achieve.

Description

technical field [0001] The invention belongs to the technical field of power system wide-area time-delay damping control, in particular to a wide-area damping control method based on power system model identification. Background technique [0002] In recent years, with the continuous expansion of the scale of my country's power grid, the security and stability of the power grid has become increasingly complex. In particular, the large-capacity power transmission of long lines between regions is likely to cause regional oscillations in the system, which has greatly affected the safe and stable operation of the entire network. threats, and to a certain extent limit the transmission capacity of inter-regional lines. However, the traditional power system control method based on local signals cannot effectively solve this problem, so it is necessary to seek new technical means. The Wide Area Measurement System (WAMS), which has been widely used in the power system recently, has t...

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Problems solved by technology

[0003] As one of the measures to deal with inter-regional low-frequency oscillations, wide-area control of power systems has attracted extensive attention from experts and scholars, but there are still many technical problems, such as: how to solve the time-delay problem in wide-area signals, how to deal with complex The difficulty of accurate modeling of high-order systems and the problem of dimensionality disaster of controllers need to be studied in depth, which are also the key problems to be solved in this patent

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