Title :
Design and Implementation of a High Accuracy Sampling Wattmeter under Non-sinusoidal and Time Varying Environments
Author :
Sarkar, Arghya ; Sengupta, S.
Author_Institution :
MCKV Inst. of Eng., Howrah
Abstract :
Errors may creep in when measuring active power under non-sinusoidal and time varying conditions by conventional regularly spaced sampling digital wattmeter (RSSDW) due to the existence of higher order voltage and current harmonics, and asynchrony between the signal fundamental frequency and the sampling rate. This paper presents design and implementation of a modified regularly spaced sampling digital wattmeter, called M-RSSDW, immune to above mentioned drawbacks of RSSDW. The proposed method utilizes a novel first degree digital integrator design technique to diminish the effects of higher order harmonics. The truncation error during asynchrony has also been reduced using numerical compensation method. M-RSSDW has been implemented in real time by means of a TMS320VC5416 digital signal processor. The laboratory test results confirm the accuracy of M-RSSDW under both static and dynamic conditions.
Keywords :
integrating circuits; power measurement; wattmeters; TMS320VC5416 digital signal processor; active power measurement; current harmonics; digital integrator design technique; higher order voltage; modified regularly spaced sampling digital wattmeter; nonsinusoidal environment; numerical compensation method; sampling rate; signal fundamental frequency; time varying environment; Creep; Current measurement; Finite wordlength effects; Frequency measurement; Power measurement; Power system harmonics; Sampling methods; Time measurement; Voltage; Wattmeters; digital wattmeter; harmonics; integrator; sampling; truncation error;
Conference_Titel :
Power System Technology and IEEE Power India Conference, 2008. POWERCON 2008. Joint International Conference on
Conference_Location :
New Delhi
Print_ISBN :
978-1-4244-1763-6
Electronic_ISBN :
978-1-4244-1762-9
DOI :
10.1109/ICPST.2008.4745283
