The present research paper is based on a survey on the Investigation of Power Quality Problems and Harmonic Exclusion in the Power System using the Frequency Estimation Technique. The majority of FD approaches are openloop, and they are based on Fourier series analysis in most cases. When applied to frequency domain approaches, Fourier series analysis is a powerful mathematical tool that allows users to acquire a wide range of frequency components by multiplying the input by a set of trigonometric functions (sine/cosine) at various frequencies. Typically, the discrete implementation of the Fourier series, also known as the Discrete Fourier Transform, is used to compute results. DFT can be done quickly and simply using computer technology, and it can be used to estimate the grid signal parameters with improved selectivity and greater steady-state accuracy than other methods. The A/D conversion process of the input signals is required for the real-time implementation of the DFT, which necessitates the repeated sampling and updating of the input signals. However, in order to compute the N samples, this approach necessitates the use of N2 complex multiplication and N2–N complex addition. As a result, it was not extensively used prior to the introduction of the microprocessor.
This work aims to investigate a problem with power quality and the exclusion of harmonics in the power system using a method called frequency estimation. This study aims to explore the performance of several strategies for estimating phase and frequency under a variety of less-than-ideal situations, such as voltage imbalance, harmonics, dc-offset, and so on. When the grid signals are characterized by dc-offset, it has been shown that most of the approaches are incapable of calculating the frequency of the grid signals. This article introduces a frequency estimation method known as Modified Dual Second Order Generalized Integrator (MDSOGI). This method accurately guesses the frequency under all of the unideal scenarios. Experiments have shown that the findings are accurate. In order to build a control scheme for a shunt active power filter that is able to function under such circumstances, the scheme is further integrated with the theory of instantaneous reactive power. In order to demonstrate enhanced performance, the experimental prototype is being created.
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