Abstract:
This paper presents a novel technique for frequency
estimation of grid signal under adverse distorted condition. The
proposed method is a combination of Zero Crossing Detection
(ZCD), and Goertzel Transform (GT) based ZCD (GZCD) for the
accumulation of their desirable features and eradication of their
drawbacks. ZCD gives a low computational solution of frequency
estimator, but it is always suffered by harmonics, noise and other
power quality disturbances. To get the low complexity benefits of
ZCD it is used after the GT. Thus, the power quality degradation
in the signal can be minimised by the GT. However, GT is found to
have a slow dynamic response. The MATLAB and PSCAD results
verify the robustness of the proposed method against various
grid conditions and the hardware experimental results show that
proposed method is easy to implement in real-time digital signal
processor and provide a fast and accurate estimation of the grid
frequency.
