A Fast Instantaneous Power Calculation Algorithm for Single-phase Rectifiers Based on Arbitrary Phase-delay Method

The instantaneous power for three-phase rectifier can be calculated directly in the orthogonal coordinate system via coordinate transformation. However, it is difficult to calculate the instantaneous power directly for single-phase rectifier due to the lack of another phase, an orthogonal signal generator (OSG) is therefore required to create an orthogonal coordinate system. Currently, conventional OSG algorithms suffer from long response time, to remedy this problem, an arbitrary phase-delay OSG algorithm based on the monophase complex vector theory is developed in this paper. The developed algorithm can quickly calculate the instantaneous active power and reactive power. Through the analysis of its principle, it can be known that the developed algorithm brings faster response speed, easy implementation and less computational burden Compared with other common OSG algorithm. Finally, the proposed OSG algorithm is applied to the direct power control system in single phase rectifier and compared with other traditional OSG algorithms. The validity and advancement of the proposed algorithm are verified by simulations and hardware-in-loop experimental tests.