Title :
Very fast phase angle estimation algorithm for a single-phase system having sudden phase angle jumps
Author :
Song, Hong-Seok ; Nam, Kwanghee ; Mutschler, Peter
Author_Institution :
Div. of Electr. & Comput. Eng., POSTECH Univ., Pohang, South Korea
Abstract :
This work proposes a very fast phase angle estimation algorithm for a single-phase system under a sudden phase angle jump condition. When a source voltage changes in a step manner, the normal phase angle detector, such as a phase locked loop (PLL) and a (low pass) filter, typically generates phase delay and results in a sluggish response, and causes some time-critical machine to malfunction. This work proposes a method of estimating the fundamental component, the phase angle and the frequency of a single-phase line voltage without a significant delay, even when the amplitude and the phase angle of the line voltage changes in a step manner, by using the weighted least-squares estimation (WLSE) method with the covariance resetting technique. An example application of a single-phase pulse width modulation (PWM) rectifier for a traction is presented in an appendix. This method can be applied to uninterruptable power supply (UPS), PWM rectifier, active filters, etc.
Keywords :
PWM power convertors; frequency estimation; least squares approximations; parameter estimation; power systems; rectifying circuits; PLL; PWM rectifier; UPS; covariance resetting technique; frequency estimation; low pass filter; normal phase angle detector; phase angle estimation; phase delay; phase locked loop; single-phase line voltage; single-phase pulse width modulation rectifier; single-phase system; sluggish response; source voltage change; sudden phase angle jump condition; uninterruptible power supply; very fast phase angle estimation algorithm; weighted least-squares estimation; Active filters; Amplitude estimation; Delay estimation; Frequency estimation; Phase detection; Phase estimation; Phase locked loops; Pulse width modulation; Rectifiers; Voltage;
Conference_Titel :
Industry Applications Conference, 2002. 37th IAS Annual Meeting. Conference Record of the
Conference_Location :
Pittsburgh, PA, USA
Print_ISBN :
0-7803-7420-7
DOI :
10.1109/IAS.2002.1042669