Selective harmonic compensation by smart inverters using multiple-complex-coefficient-filter (MCCF) during unbalanced fault condition

Shuvra, Mahfuz A.; Chowdhury, Badrul

doi:10.1109/naps.2017.8107384

Cited by 7 publications

(9 citation statements)

References 16 publications

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“…This can be illustrated as shown in Fig. 5 where it is shown that the normalised voltage vector has adifferent locus and frequency during an unbalanced fault [23].…”

Section: Proposed Control Strategymentioning

confidence: 99%

Distributed dynamic grid support using smart PV inverters during unbalanced grid faults

Shuvra

Chowdhury

2019

IET Renewable Power Generation

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A dynamic voltage support strategy using smart photovoltaic (PV) inverters during unbalanced grid faults events is proposed. It uses Karush-Kuhn-Tucker condition for finding optimal solutions to calculate the inverter's active and reactive current references. The proposed methodology also takes the X/R ratio into consideration which allows the inverter to differentiate weak or strong grid conditions and adjust its reference currents. Existing multiple-complex coefficient-filter based phase locked loop is used to extract the positive and negative sequence components. The proposed strategy deploys existing dual vector current control to ensure optimal current injection and low voltage ride through. A distributed ride-through coordination approach among multiple inverters is also proposed based on different optimisation goals-either fundamental positive or fundamental negative sequence voltage support. The strategy is simulated, and inverter's transient performance is experimentally verified on a modified IEEE-13 bus test feeder using controller hardware-in-the-loop approach. Results show substantial evidence that the proposed method can be successfully applied to support the grid during an unbalanced fault event. Table 1 Voltage ride-through requirement Voltage range, p.u. Clearing time, s

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“…This can be illustrated as shown in Fig. 5 where it is shown that the normalised voltage vector has adifferent locus and frequency during an unbalanced fault [23].…”

Section: Proposed Control Strategymentioning

confidence: 99%

Distributed dynamic grid support using smart PV inverters during unbalanced grid faults

Shuvra

Chowdhury

2019

IET Renewable Power Generation

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“…Multiple reference frame-based PLL is described in [7] utilises a decoupled network to avoid the effect of voltage unbalance in the grid. Adaptive filters (AFs) based on several synchronisation methods are discussed in [8][9][10][11][12]. The signals are pre-filtered then the magnitude, phase, and frequency are estimated.…”

Section: Introductionmentioning

confidence: 99%

“…Three-phase enhanced PLL (E-PLL)-based control proposed in [11] does not give accurate estimation under abnormal grid conditions. Multiple complex filters are used for synchronisation under distorted grid condition and are reported in [12,13]. Under weak grid conditions, the coupling between PLL and grid impedance leads to harmonic resonance and also instability in the system [14,15].…”

Section: Introductionmentioning

confidence: 99%

Power quality improvement of single phase weak grid interfaced hybrid solar PV and wind system using double fundamental signal extracter‐based control

Gupta

Murshid

Singh

2019

IET Generation, Transmission & Distribution

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“…Refs [15,16], respectively, propose phase-locking methods for firstorder and second-order cross-decoupling frequency adaptive complex filtering, without symmetrical component method and a large number of rotating coordinate transformations. In Refs [17][18][19], a phase-locked loop based on multiple-complex-coefficient-filter (MCCF-PLL) is presented, which can distinguish between positive and negative sequence components of the same frequency. There are also other phase-locking techniques such as the enhanced phase-locked loop (EPLL) [20], the adaptive notch filtering-based synchronization technique [21], the dq-coordinate system cascaded delay signal cancellation phase-locked loop (dqCDSC-PLL) [22], the novel decoupling network designed in the αβ-frame (DNαβ-PLL) is proposed to achieve a dynamic and accurate synchronization under harmonic distorted and unbalanced grid voltage [23] and so on.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, the complex coefficient filter is derived from the Clark transform and the first-order low-pass filter for phase-locked loop analysis. It is different from the phase-locked loop with a complex coefficient filter [17][18][19]. The SRF-PLL is analyzed in Section 2, and the improvement of SRF-PLL is presented in Section 3.…”

Section: Introductionmentioning

confidence: 99%

A novel hybrid coordinates multiple decoupled phase‐locked loop under nonideal grid conditions

Liu

Wang

2019

IEEJ Transactions Elec Engng

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A novel hybrid coordinates multiple decoupled phase-locked loop (HCMD-PLL) is presented to improve the performance of the PLL under nonideal grid conditions. Based on the Clark transform and the first-order low-pass filter, the complex coefficient filter is derived to analyze phase-locked loop. It is different from the phase-locked loop with a complex coefficient filter. On this basis, the multiple-complex-coefficient band-pass filter of HCMD-PLL is derived, and the equivalent transfer function of the decoupling of the fundamental positive sequence, negative sequence and harmonic components is obtained, and the magnitude and phase frequency responses are analyzed. The fundamental positive sequence component is extracted without phase shift and amplitude attenuation under the nonideal grid conditions, eliminating the effect of specific-order harmonics components because the amplitude is attenuated to zero. And the specific-order harmonic component can also be extracted precisely. The interaction from the various specific components is eliminated. The stability of the system is analyzed by the pole distribution of the closed-loop system. The stationary αβ coordinate system for PLL is adopted to suppress the change of the grid voltage. Simulation and experimental results verify the effectiveness of the HCMD-PLL. (Non-member) received the M.S. degree in power electronics and power drives from the school of Information and Electrical Engineering, China University of Mining and Technology in 2014 and is currently pursuing the Ph.D. degree in School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University. He has worked on multilevel converters, reactive power compensation and power electronic power transmission.Lifeng Guo (Non-member) received the M.S. degree in power electronics and power drives from the school of Information and Electrical Engineering, China University of Mining and Technology in 2013 and is presently working in China Ship Development and Design Center Shanghai Branch. He has worked on high power multilevel converters and vessel integrated power system.

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Selective harmonic compensation by smart inverters using multiple-complex-coefficient-filter (MCCF) during unbalanced fault condition

Cited by 7 publications

References 16 publications

Distributed dynamic grid support using smart PV inverters during unbalanced grid faults

Distributed dynamic grid support using smart PV inverters during unbalanced grid faults

Power quality improvement of single phase weak grid interfaced hybrid solar PV and wind system using double fundamental signal extracter‐based control

A novel hybrid coordinates multiple decoupled phase‐locked loop under nonideal grid conditions

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