Real-Time implementation of a SPLL for FACTS

Freijedo, Francisco D.; Doval-Gandoy, Jesús; López, Oscar L.; Pineiro, David; Penalver, C.M.; Nogueiras, A.

doi:10.1109/iecon.2006.347484

Cited by 16 publications

(6 citation statements)

References 9 publications

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“…However, the suitability of digital implementation allow the use of more complex techniques such as the implementation of notch filter to selective harmonic cancellation [7], moving average filters to cancel for multiple harmonics [6], [11], dynamic cancellation (dynamic filtering) based on feedback signals [2], [6], [11]. However, the implementation of any of these techniques is associated with a reduced bandwidth.…”

Section: B Steady-state Distortion and Bandwidthmentioning

confidence: 97%

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Tunning of Phase Locked Loops for Power Converters under Distorted Utility Conditions

Freijedo

Doval-Gandoy

López

et al. 2009

2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition

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A b stra ct -This paper analyzes the tuning of the phase locked loops (PLLs) employed in the control of power converters when there is distortion in the AC mains. The pros and cons of different optimization approaches are studied.In a general way, PLLs with a low bandwidth (low-gain PLLs) are required when handling with distorted. This paper proves that the tuning of low-gain PLLs have more than one trade-off. Besides the well known filtering versus transients response, it is also proved the existence of a trade-off between the response to phase-jumps and frequency variations: it is not possible to optimized the settling time for a phase step without getting slower the PLL response to frequency variations. All of issues should be taken into account for a correct tuning of the PLL, since a big part of the control of a power converters is in the synchronization algorithm.Experimental results obtained through a digital implementation (dSpace DS1103) validates the theoretical approach.

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Section: B Steady-state Distortion and Bandwidthmentioning

confidence: 97%

“…Under such a situation, a low-gain PLL is indeed slower than usual, and therefore the re-tracking time could be unacceptable. To overcome this situation an amplitude loop compensating for amplitude variations can be placed, but it adds complexity to the PLL as well as to the dynamics assessment [6], [11].…”

Section: Grid Events and Transient Responsesmentioning

confidence: 99%

Tunning of Phase Locked Loops for Power Converters under Distorted Utility Conditions

Freijedo

Doval-Gandoy

López

et al. 2009

2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition

Self Cite

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“…4). This technique permits to cancel this ripple without a drastic reduction of the PLL bandwidth [25].…”

Section: B Pll For Axis-wave Generation With Frequency Adaptationmentioning

confidence: 99%

“…The implemented PLL is a single-phase one, connected to the common coupling point voltage (V pcc ); its architecture is equivalent to the phase loop of the more complex PLL of Freijedo et al [25]. It is composed of a phase detector, a PI filter, and a digitally controlled oscillator centered around the nominal frequency ω 1n = 2π50 rad/s.…”

Section: B Pll For Axis-wave Generation With Frequency Adaptationmentioning

confidence: 99%

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A Signal-Processing Adaptive Algorithm for Selective Current Harmonic Cancellation in Active Power Filters

Freijedo

Doval-Gandoy

López

et al. 2009

IEEE Trans. Ind. Electron.

122

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Selective harmonic cancellation has become of primary importance in a wide range of power electronics applications, for example, uninterrupted power systems, regenerative converters, and active power filters (APFs). In such applications, the primary objectives are an accurate cancellation of selected harmonics and a quick speed of response under transients. This paper provides a novel signal-processing algorithm for selective harmonic identification based on heterodyning, moving average finite-impulse response filters, and phase-locked loop (PLL). The algorithm is applied over the current of a nonlinear load in the feedforward-based control of an APF. The PLL tracks the phase and frequency of the fundamental component. Then, the fundamental phase is multiplied by the order of the selected harmonic, and two random unitary orthogonal "axis waves" are generated. These unitary waves, rotating at the harmonic frequency, are multiplied by the input load current, thereby "moving" the Fourier series coefficients of the selected harmonic to dc (heterodyning). Moving average FIR filters are used to filter the harmonics generated in the heterodyning process from the dc signal; moving average FIR filters are very suitable for most of the power quality applications, thanks to their "comb-type" frequency response and their quick transient response. Experimental results confirm good performance for steady-state harmonic cancellation and an optimal system response to load transients. The theory of the algorithm has been developed for single-and three-phase systems.

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