Stability analysis and concept extension of harmonic decoupling network for the three-phase grid synchronization systems

Luo, Zhaoxu; Su, Mei; Sun, Yang; Wang, Hui; Yuan, Wenbin

doi:10.1016/j.ijepes.2017.01.003

Cited by 10 publications

(8 citation statements)

References 24 publications

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“…where the shunt and series VSCs have similar MSE functions. The MSE function of the shunt VSC is related to the current expression in (21), while the series VSC is related to voltage expressed in (22) for the elimination of the PQ issue. N represents the total number of iterations for the particle after the kth iteration.…”

Section: Pso Optimization Algorithm and Formulationmentioning

confidence: 99%

“…The integral link output signal in the PI controller of SRF-PLL was improved to estimate the grid frequency acutely, yielding an enhanced performance compared to the CCF-PLL structure. 21 Hence ECCF-PLL control is faster than SRF-PLL control for attenuating harmonics and accurately providing the grid parameters. ECCF-PLL consists of two complex band-pass filters with the center frequency at the fundamental positive-sequence component (FPSC) and negative-sequence (FNSC) frequencies.…”

Section: Introductionmentioning

confidence: 99%

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Compensation of power quality problems throughUPQC‐Susing enhanced complex coefficient filter

Alam

Arya

2021

Int Trans Electr Energ Syst

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Section: Pso Optimization Algorithm and Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compensation of power quality problems throughUPQC‐Susing enhanced complex coefficient filter

Alam

Arya

2021

Int Trans Electr Energ Syst

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“…The bode plots for Q(s) and E(s) can be drawn from equations (9) and (16) as shown in Fig.3. From Fig.3, it can be observed that when the grid frequency is lower than the resonance frequency of the NF structure(ω <ω), the difference signal e and the output signal qv' have the same changing trends, and when the grid frequency is higher than the resonance frequency of the NF structure(ω >ω), the difference signal e and the output signal qv' have opposite changing trends.…”

Section: =ωEmentioning

confidence: 99%

“…When the three-phase voltage is balanced and not distorted, the SRF-PLL can track the voltage phase quickly and accurately. When the three-phase voltage is unbalanced and distorted, the bandwidth of SRF-PLL needs to be reduced to improve the harmonic suppression capability, but the response speed is also reduced [8], [9]. In order to further improve the filtering performance and dynamic response speed of SRF-PLL, many advanced three-phase PLLs based on SRF-PLL have been proposed.…”

Section: Introductionmentioning

confidence: 99%

A Novel Grid Synchronization Method Based on Hybrid Filter Under Distorted Voltage Conditions

et al. 2020

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The phase-locked accuracy of conventional phase-locked method is reduced when the grid voltage contains fundamental frequency negative sequence(FFNS) component, harmonic component, and DC offset component. Aiming at this problem, a novel adaptive notch filter (NANF) is proposed, and a dual NANF (DNANF) structure is designed to eliminate the FFNS component and extract the fundamental frequency positive sequence(FFPS) component based on NANF. Furthermore, dcDNANF with DC offset rejection capability is proposed by adopting DNANF. Then a novel hybrid filter in dq-frame is designed by combining dcDNANF and the cascaded delay signal cancellation operator filter whose delay parameters are 4 and 24 in dq-frame (dqCDSC 4,24). Meanwhile, a new SRF-PLL design method is proposed based on the novel hybrid filter. This proposed method employs dqCDSC 4,24 to separate the positive and negative sequences of the voltage and eliminate the high frequency harmonics in the grid voltage, and uses dcDNANF to reject the DC offset, so as to achieve the accurate acquisition of the fundamental voltage information under distortion and unbalanced grid. Simulation and experimental results show that compared with the conventional SRF-PLL methods, the proposed method can obtain faster phase tracking speed, better phase-locked effect, faster dynamic response, and better stability. INDEX TERMS Novel adaptive notch filter (NANF), harmonic, phase-locked loop (PLL), dc offset, cascaded delay signal cancellation (CDSC).

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“…In [27], the CCF-PLL was designed based on the second-order complex coefficient filter, which had better harmonic attenuation suppression ability than the first-order complex coefficient filter scheme. Similarly, [28] proposed a generalized multiorder CCF-PLL (GMOCCF-PLL), which further enhances the dynamic characteristics and filtering capabilities of the conventional CCF-PLL.…”

Section: Introductionmentioning

confidence: 99%

Design of a High Performance Phase-Locked Loop With DC Offset Rejection Capability Under Adverse Grid Condition

2020

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In the new energy grid-connected power generation system, accurately extracting the grid synchronization signals such as the frequency, phase and amplitude of the grid voltage is the basis for effective control. Aiming at the requirements for detecting grid synchronization signals under unbalanced, harmonics and DC offset voltage mixed conditions, a dual second-order complex coefficient filter with DC offset rejection capability (DSOCCF dc) is proposed, combining the approach of moving average filter (MAF), a novel hybrid filter in dq-frame is designed and on the basis of this design a new synchronous reference frame phase locked loop (SRF-PLL) design approach based on the hybrid filter is proposed. The proposed approach employs moving average filter (MAF) to block the high-frequency harmonics in the grid voltage, and uses DSOCCF dc to separate the fundamental frequency positive and negative sequence and reject DC offset. It can accurately extract the synchronization information of the grid fundamental frequency positive sequence. After simulation and experiment verification, it can be confirmed that the proposed PLL can quickly and accurately lock the properties of the grid voltage under adverse grid condition, and also have high detection accuracy and strong robustness to frequency fluctuations. INDEX TERMS Dual second-order complex coefficient filter (DSOCCF), harmonic, phase-locked loop (PLL), dc offset, moving average filter (MAF).

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Stability analysis and concept extension of harmonic decoupling network for the three-phase grid synchronization systems

Cited by 10 publications

References 24 publications

Compensation of power quality problems throughUPQC‐Susing enhanced complex coefficient filter

Compensation of power quality problems throughUPQC‐Susing enhanced complex coefficient filter

A Novel Grid Synchronization Method Based on Hybrid Filter Under Distorted Voltage Conditions

Design of a High Performance Phase-Locked Loop With DC Offset Rejection Capability Under Adverse Grid Condition

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