Positive sequence voltage memory filter for numerical digital relaying applications

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Abstract
A positive sequence voltage memory filter for numerical digital relaying applications is proposed. It is designed based on converting an analogue first‐order lowpass filter into an infinite impulse response digital filter using the backward difference method. Its combination with both recursive and non‐recursive phasor estimation algorithms is discussed. The obtained results reveal the decaying time constant of the proposed filter transient response is easily set, providing a simple and stable mean to adaptively adjust the positive sequence voltage memory polarisation of numerical relays.

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