Study on Harmornic Phase Measure and Control Methods of Active Tuned Filter
|School||Xi'an University of Technology|
|Course||Power Electronics and Power Drives|
|Keywords||Harmonic STFT Active tunable filter|
AC tuned filter still occupies an irreplaceable position in the high - voltage , high-capacity system , but a single detuning and a single LC branch filter characteristics shortcomings restricted its development . Therefore, AC tuned filter to transform and achieve automatic continuous tuning the direction of one of the harmonic filter study . How to quickly and accurately detect the phase of harmonic filtering system is automatically continuous multi- tuned filter key . Because the active tunable filters using phase control strategy , not only to detect the amplitude of the harmonic and simultaneous detection of phase information . Instantaneous reactive power theory taking into account the difficulties in the detection of single harmonic traditional Fourier transform to detect the lack of non-stationary signals , studied the short time Fourier transform and the wavelet transform to detect single harmonic amplitude and phase information method. Establish a single harmonic detection method based on short-time Fourier transform and wavelet transform simulation models , simulation compare the test results of the two methods , the results of the comparison show that when the signal under test contains multiple harmonic frequency closer wave component , the short - time Fourier transform can be preferably detected required single harmonic component , and the detection results of the wavelet transform is poor . Single-phase single harmonic detection method based on short-time Fourier transform of the experimental system , single-phase single harmonic component and the fast and accurate detection of the phase information . This article discusses the AC tuned filter characteristics , highlights and control strategies based on the works of the the active reactor active tunable filter based on a the STFT single harmonic detection method , established source tunable filter SIMULINK simulation model and hardware experiment system , simulation and experimental results show that the filter can achieve a single branch of the multi- tuned filtering , and automatic continuous adjustment .