New Positive-sequence Voltage Detector for Grid Synchronization of Power Converters under Faulty Grid Conditions

By P. Rodriguez, Remus Teodorescu, I. Candela, Adrian V. Timbus, Marco Liserre, Frede Blaabjerg. 2006

857 citations recorded by the source corpus.

This paper deals with a fundamental aspect in the control of grid-connected power converters, i.e., the detection of the positive-sequence component at fundamental frequency of the utility voltage under unbalanced and distorted conditions. Accurate and fast detection of this voltage component under grid faults is essential to keep the control over the power exchange with the grid avoiding to trip the converter protections and allowing the ride-through of the transient fault. In this paper, the systematic use of well known techniques conducts to a new positive-sequence voltage detection system which exhibits a fast, precise, and frequency-adaptive response under faulty grid conditions. Three fundamental functional blocks make up the proposed detector, these are: i) the quadrature-signals generator (QSG), ii) the positive-sequence calculator (PSC), and iii) the phase-locked loop (PLL). A key innovation of the proposed system is the use of a dual second order generalized integrator (DSOGI) to implement the QSG. For this reason, the proposed positive-sequence detector is called DSOGI-PLL. A detailed study of the DSOGI-PLL and verification by simulation are performed in this paper. From the obtained results, it can be concluded that the DSOGI-PLL is a very suitable technique for characterizing the positive-sequence voltage under grid faults.

Subfields: Control and Systems Engineering, Electrical and Electronic Engineering, Energy Engineering and Power Technology

View Paper: https://www.semanticscholar.org/paper/157a958a1d4edcac3e3922b60452583f9d603d33

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Citations in the corpus

Multiple-Complex Coefficient-Filter-Based Phase-Locked Loop and Synchronization Technique for Three-Phase Grid-Interfaced Converters in Distributed Utility Networks (2011, methodology): “Later, the sinusoidal signal integrator [14], double second-order generalized integrator (DSOGI) [15], and the fast PLL [16] based on software PLL 0278-0046/$26.00 © 2010 IEEE were presented for the similar purpose.”
Analysis of Phase-Locked Loop Low-Frequency Stability in Three-Phase Grid-Connected Power Converters Considering Impedance Interactions (2015, methodology): “It uses an abc/dq transformation block [30], [31] as”
Design-Oriented Study of Advanced Synchronous Reference Frame Phase-Locked Loops (2013, methodology): “[24] is a dual second-order generalized integrator based PLL (DSOGI-PLL), which works based on the instantaneous symmetrical components (ISC) theory in the stationary (αβ) reference frame.”
A Novel Flux Estimator Based on Multiple Second-Order Generalized Integrators and Frequency-Locked Loop for Induction Motor Drives (2017, background): “6 works, its control signal is first identified as εf , which works for collecting the information of frequency observation error [12].”
Flexible Active Power Control of Distributed Power Generation Systems During Grid Faults (2007, methodology): “In this paper, such characterization is performed by means of a positive–negative-sequence voltage detector based on a second-order generalized integrator (SOGI) [24].”
Symmetrical PLL for SISO Impedance Modeling and Enhanced Stability in Weak Grids (2020, background): “The typical prefilters include the positive-sequence filter based on the generalized integrator [15], the quadrature PLL [16], the adaptive filter based on the second-order generalized integrator [17]−[19], the complex coefficient prefilter [20], [21], and the prefilters based on the delayed signal ”
Detection of Grid Voltage Fundamental and Harmonic Components Using Kalman Filter and Generalized Averaging Method (2016, methodology): “The discrete version of the linear KF is expressed as follows [32]: { xk+1 = φkxk + Γkγk yk = Fkxk + vk (1)”
Comparison and evaluation of the PLL techniques for the design of the grid-connected inverter systems (2010, background): “The global performances results improved because the PLL is connected to a filtered version of q v + [16].”
Three-Phase PLLs: A Review of Recent Advances (2017, neutral): “SOGI-based PLLs [31], [51] High High Yes Fast High High”
Variable Sampling Period Filter PLL for Distorted Three-Phase Systems (2012, methodology): “This method is widely used in the literature to estimate the system phase error in digital PLL [15]–[20].”
Multiresonant Frequency-Locked Loop for Grid Synchronization of Power Converters Under Distorted Grid Conditions (2011, methodology): “An adaptive filter structure, based on the GI structure, named SOGI was presented in [38] and [39].”
Variable-Frequency Grid-Sequence Detector Based on a Quasi-Ideal Low-Pass Filter Stage and a Phase-Locked Loop (2010, methodology): “The DSOGI-PLL and the three-phase ANF have a higher transitory error, but a fast performance, while the DSOGI-FLL has slower dynamics.”
Highly Accurate Derivatives for LCL-Filtered Grid Converter With Capacitor Voltage Active Damping (2016, methodology): “In-phase SOGI has earlier been used as a phase-locked loop [26].”
A review on fundamental grid-voltage detection methods under highly distorted conditions in distributed power-generation networks (2011, methodology): “Methods considered here that are using this additional pre-filter are: Decoupled Synchronous Reference-Frame PLL (DSRF-PLL) [6], Delayed Signal Cancelation PLL (DSC-PLL) [7], Sinusoidal Signal Integrators PLL (SSI-PLL) [8] and the Double Second Order Generalized Integrator PLL (DSOGIPLL) [9,10].”
An Improved Second-Order Generalized Integrator Based Quadrature Signal Generator (2016, methodology): “For example, the SOGI-QSG was configured as a SOGI-phased-locked loop (SOGI-PLL) in [1] and [3] for grid synchronization, a SOGI-frequency-locked loop (SOGI-FLL) in [4] for frequency estimation, a multiple SOGI-QSGs (MSOGI-QSG) in [5] for harmonic extraction, and a double SOGI-QSGs (DSOGI-QSG) in [6”
Wind in Weak Grids: Low-Frequency Oscillations, Subsynchronous Oscillations, and Torsional Interactions (2020, background): “Rodriguez et al designed a double second-order generalized integrator (DSOGIPLL) to detect positive-sequence voltage [20].”