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A MATLAB GUI is presented which is used to help students learn to design controllers in the frequency domain. It complements the author's two previous GUIs for plotting and identification of systems in the frequency domain. It also incorporates the concept used in the “electronic calculator that makes students think” to assist learning. Positive student feedback affirms that the GUI has helped their...
This paper proposes a weighted least-squares (WLS) method for designing wide-band length-6 cubic interpolation kernels in the frequency-domain. The length-6 cubic is symmetric and constructed by connecting three piecewise polynomials of third-degree, and their optimal coefficients are found through minimizing the weighted squared error between the desired and actual frequency responses of the cubic...
This work presents two applications of a novel tool developed for the approximate calculation of behavior in the domain of the frequency of Multirate Sampled-Data Control Systems. The cases presented here focus on the designing of digital regulators that operate with more than one sampling frequency, the aim being to stabilize the system in closed loop using relatively low sampling frequencies of...
This paper performs a frequency-domain analysis of three different resonant current controllers for active power conditioners. The analysis is focused on the closed loop frequency response and Nyquist plots for all current controllers of interest. The system stability when the active power conditioner attempts compensating high order harmonics is investigated. To perform this analysis, the time delay...
In this paper, a new technique for on-line multivariable process identification in the frequency domain based on a simple experimental test is presented. Step changes in the controller set point are performed on the process so that the process frequency-response matrix is estimated with signal decomposition and analysis method in the frequency domain, and accurate transform-function matrix is identified...
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