Optimal power system load frequency control method considering time lag and noise interference

Abstract

The invention discloses an optimal power system load frequency control method considering time lag and noise interference. The method comprises the following steps: firstly building a power system load frequency control model based on an integral controller, then replacing the integral controller in the model with a PI controller, collecting three state quantities of frequency deviation of the power system, the added power of a generator and the action quantity of a speed regulator at the same time to serve as feedback quantities, and constructing a PI full-state feedback control model; then introducing a Kalman filter, and constructing a PI full-state feedback control model based on the Kalman filter; and finally, adding time lag and noise interference into the model, and performing control parameter optimization on the model by utilizing a genetic algorithm. According to the method, noise in the feedback quantity sampling process is obviously suppressed, and the method has excellent time delay robustness and dynamic performance.

Description

technical field [0001] The invention relates to the field of power system control, in particular to an optimal power system load frequency control method that counts time lag and noise interference. Background technique [0002] The power system is an important infrastructure related to the national economy and people's livelihood. Frequency stability is one of the three elements of power system stability. When the power generation power of the power system is unbalanced with the active demand of the load, the frequency of the power system will deviate to a certain extent, and in serious cases, it will affect the safe and stable operation of the power system. In order to keep the frequency of the system at the reference value when there is a large load disturbance, the power system adopts the secondary adjustment of the frequency, that is, the load frequency control (LFC), to realize the non-difference adjustment of the frequency. [0003] In the production practice of ele...

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Problems solved by technology

However, none of the above methods take full advantage of the multi-state characteristics of the power system, making the LFC system fail to obtain the best time-delay robustness

At the same time, the noise problem in the sampling process of the feedback quantity has not been fully considered, which seriously affects the stability margin in the actual application of the LFC system

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