Abstract
With the further development of harmonic pollution in the power system, scientists have carried out research on harmonics. Among them, harmonic detection is the first step in harmonic research. In this paper, a harmonic detection method based on an observer is proposed. This method first uses the cascaded Second-Order Generalized Integration (SOGI) algorithm, which can filter the Direct Current (DC) component of the input signal to extract the fundamental frequency, and then uses a time-varying observer to extract the harmonics. This can be used to extract harmonics from a distorted online grid signal. The effectiveness of the proposed method was evaluated on the Speedgoat Rapid Control Prototype (RCP) platform. The results show that it can complete the convergence within 0.05 s, and the standard deviation after stability will not exceed 1%.
Highlights
With the continuous expansion of the power grid scale, power electronic devices such as non-linear loads have been widely used
Since the focus on the test is to compare the performance of the harmonic extraction,the fundamental frequency and phase information required by the two methods are obtained by cascading Second-Order Generalized Integration (SOGI)
A composite observer is used to detect the harmonics of the distorted power grid signal
Summary
With the continuous expansion of the power grid scale, power electronic devices such as non-linear loads have been widely used. Much literature has been published in the field of harmonic governance, and a variety of effective methods have been proposed from different dimensions [5]. A fast and accurate real-time harmonic detection method under the influence of power grid fluctuations is the premise of other work. The harmonic detection methods mainly include Fast Fourier Transform (FFT) [9,10], Instantaneous Reactive Power Theory (IRPT) [11,12], Synchronous Reference Frame (SRF) [13], Cascade Delay Signal Cancellation technology (CDSC) [14], and Kalman filter [15], in addition to improved techniques for these methods, etc. The disadvantage is that complex coordinate transformation process is required in the calculation process, which increases the calculation difficulty
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