Fundamental Positive- and Negative-Sequence Estimator for Grid Synchronization Under Highly Disturbed Operating Conditions

Abstract-Distributed generation inverters have become a key element to improve grid efficiency and reliability, especially during grid faults. Under these severe perturbations, inverterbased power sources should accomplish low-voltage ride-through requirements in order to keep feeding the grid and support the grid voltage. Also, rated current can be required to better utilize reactive power provisions. This paper presents a reference generator capable to accomplish these two objectives: to keep the injected currents within safety values, and to compute the power references for a better utilization of the inverter power capacity. The reference generator is fully flexible since positive and negative active and reactive powers can be simultaneously injected to improve ride-through services. Selected experimental results are reported to evaluate the performance of the proposed reference generator under different control strategies.

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“…To further detail the current components, note that each expression in (27)- (30) has a positive and a negative sequence term…”

Section: B Proposed Control For Unbalanced Grid Voltagesmentioning

confidence: 99%

Active and Reactive Power Strategies With Peak Current Limitation for Distributed Generation Inverters During Unbalanced Grid Faults

Camacho

Castilla

Miret

et al. 2015

IEEE Trans. Ind. Electron.

259

197

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“…Thus, a proper current-mode control, capable of riding through voltage sags is required. [41]- [46]. The voltage support block detects the voltage sag and provides the reactive power references Q + and Q − to the reference generator.…”

Section: B Voltage Sag Identificationmentioning

confidence: 99%

Reactive Power Control for Distributed Generation Power Plants to Comply With Voltage Limits During Grid Faults

Camacho

Castilla

Miret

et al. 2014

IEEE Trans. Power Electron.

173

110

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“…The design guidelines for MAF-based PLL schemes could be found in [20]. Recently, second-order finite impulse response type notch-filter has also been considered [26] for the removal of dominant lower order harmonics. Frequency adaptiveness is achieved using higher order filters instead of using PLL or frequency-locked loop.…”

Section: Review Of Filtering Schemesmentioning

confidence: 99%

Rapid Tracking of Grid Variables Using Prefiltered Synchronous Reference Frame PLL

Chandrasekaran

Ragavan

2015

IEEE Trans. Instrum. Meas.

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For synchronization applications, synchronous reference frame (SRF) phase-locked loop (PLL) is widely deployed. Its performance is excellent when the input voltage consists of only fundamental positive sequence (FPS) component. If the grid voltage is unbalanced or polluted with harmonics and dc offset, its performance degrades. Many modifications were proposed to address this issue. However, the removal of dc offset and fundamental negative sequence (FNS) component without compromising the dynamic performance still remains a challenging task. To this end, this paper presents a rapid Type-1 SRF PLL scheme with preloop filtering stage for tracking the attributes of grid voltage FPS component. Fixed sampling period sliding discrete Fourier transform (SDFT) and instantaneous symmetrical components method are employed in the preloop stage. With this modification, the dc offset, harmonics and the FNS component are rejected and only the FPS component enters the PLL. As a result, transients vanish quickly. However, when the grid frequency drifts, SDFT causes amplitude and phase errors, and Type-1 PLL introduces a steady-state tracking error in phase. These errors are compensated with the help of an error correction criteria. Robustness and the improved transient response of the proposed scheme are demonstrated with an experimental study involving real-time controller board (dSPACE DS1104) and three-phase programmable power source.

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Fundamental Positive- and Negative-Sequence Estimator for Grid Synchronization Under Highly Disturbed Operating Conditions

Cited by 46 publications

References 29 publications

Active and Reactive Power Strategies With Peak Current Limitation for Distributed Generation Inverters During Unbalanced Grid Faults

Active and Reactive Power Strategies With Peak Current Limitation for Distributed Generation Inverters During Unbalanced Grid Faults

Reactive Power Control for Distributed Generation Power Plants to Comply With Voltage Limits During Grid Faults

Rapid Tracking of Grid Variables Using Prefiltered Synchronous Reference Frame PLL

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