A Fast Orthogonal Signal-Generation Algorithm Characterized by Noise Immunity and High Accuracy for Single-Phase Grid


Typical orthogonal signal-generation strategies for single-part grid suffer from long response time, approximation errors, and/or noise amplification. To remedy this problem, a unique orthogonal signal-generation algorithm, which is characterised by exceptional response speed, high accuracy, noise immunity, and easy implementation, is developed in this paper. The developed algorithm will precisely calculate the orthogonal signal at intervals about a pair of.5 ms when the amplitude/phase of the grid signal changes suddenly, under the premise of not significantly increasing the computational burden compared with the traditional strategies. Way additional vital is that the high accuracy of the proposed methodology is independent of the system sampling frequency; hence, effectively avoiding the approximation errors in a big selection of sampling frequencies. In addition, it's shown how the noise amplification issue caused by the developed algorithm, which is almost equal to that of the first-order differentiating methodology, will be effectively solved by proper time-span scaling and restricted into an appropriate vary. Finally, the validity and advancement of the developed algorithm are verified by experimental results.

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