Abstract
Harmonic current estimation is the key aspect of Active Power Filter (APF) control algorithms to generate a reference current for harmonic compensation. This paper proposes a novel structure for harmonic current estimation scheme based on Trigonometric Orthogonal Principle (TOP) and Self Tuning Filter (STF). The key advantages of the proposed method are its simplicity, low computational burden and faster execution time in comparison to the conventional harmonic current estimation approaches. The TOP method provides a simple and fast approach to extract the reference current, while STF provides a simplified structure to generate the required synchronization signal that eliminates the need of a Phase Locked Loop (PLL) algorithm for synchronization. As a result, it exhibits less complexity in implementation and less consumption of microcontroller`s resources; thus, the proposed method can be implemented using a low-cost microcontroller. It is shown in the paper that the proposed method provides 10 times gain in processing speed as compared to the conventional DQ method. The proposed approach is analyzed in detail, and its effectiveness and superior performance are verified using simulation and experimental results.
Highlights
Advancements of power electronics have significantly increased the use of power converters in domestic, commercial and industrial applications for efficient energy utilization
The proposed synchronization signal generation (STF) and the proposed current harmonic extraction algorithm (TOP) are individually tested, and a whole Active power filters (APF) system including the combination of Trigonometric Orthogonal Principle (TOP) and Self Tuning Filter (STF) will be tested and analyzed
This synchronization signal is used as a phase reference for the proposed current harmonicextraction algorithm (TOP) which eliminates the use of a Phase Locked Loop (PLL)
Summary
Advancements of power electronics have significantly increased the use of power converters in domestic, commercial and industrial applications for efficient energy utilization. Time-domain based approach, like Instantaneous Reactive Power Theory (IRPT) [17], [22] and Synchronous Reference Frame (SRF) [13], [23], [24], are still prevalent method despite introduction of novel approaches for reference-current generation These well-tested methods are simple in implementation, reduce controller complexity and are suitable for practical implementation. The proposed method excludes PLL from the APF control algorithm Instead it utilizes a simple structure of the STF for extracting fundamental component of the grid voltage, eliminating the complexity associated with implementation of PLL as well as isolating the APF from grid-voltage disturbances.
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