Abstract
Abstract An improved harmonic detection method based on average arithmetic is proposed. According to the research results, the designed solution uses an LPF (low-pass-filter) and a mean value module connected in series instead of the conventional mean value module, and simultaneously, a three-phase voltage phase-locked module instead of commonly used PLL (phase lock loop) module is applied in order to reduce the influence caused by three-phase distorted voltage and rapid variation of load. The experimental results show that the application of this solution leads to increase in the accuracy of harmonics detection for distorted three-phase voltage and rapid variation of load.
Highlights
With the development of power electronic devices in recent decades, more and more power converters are applied onboard, and the ship electric propulsion system is the representative example
According to the research results, the designed solution uses an LPF and a mean value module connected in series instead of the conventional mean value module, and simultaneously, a three-phase voltage phase-locked module instead of commonly used PLL module is applied in order to reduce the influence caused by three-phase distorted voltage and rapid variation of load
A improved harmonic current detection method is discussed under the circumstances of distorted three-phase voltage - with unbalanced initial phase angles and amplitudes in the presence of rapid variation of load
Summary
With the development of power electronic devices in recent decades, more and more power converters are applied onboard, and the ship electric propulsion system is the representative example. A problem how to detect and compensate harmonic components with appropriate accuracy in a real time is one of the most important questions concerning a problem of power quality in ship networks This question is fundamental from the point of view active or hybrid power filters control [9], [15]. In the case of distorted three-phase voltage, these methods sometimes cannot detect positive sequence component accurately Sometimes their accuracy may be influenced by the variation of the fundamental current. An advanced PLL circuit is proposed for detection of the positive sequence voltage completed by a module consisting of a LPF and a mean module that are connected in series. It is to supersede the conventional LPF
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