Pre‐filter phase‐locked loop: principles and effects with inter‐harmonic perturbation

Hou, Changbo; Zhu, Miao; Chen, Yijia; Cai, Xu

doi:10.1049/iet-rpg.2020.0448

Cited by 3 publications

(3 citation statements)

References 31 publications

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“…With the rapid development of power electronics and extensive application of non-linear power electronics, harmonic/inter-harmonic pollution in power systems is becoming more and more serious [1]. The impact of harmonics on power quality is also getting more and more attention.…”

Section: Introductionmentioning

confidence: 99%

Archives of Electrical Engineering

Sun,

Song,

Jin

2022

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In order to improve the detection accuracy of harmonics/inter-harmonics in power systems, a new method of harmonic/inter-harmonic detection based on synchrosqueezed transform and the Hilbert operator based on local spectrum maximum is proposed. Firstly, the spectrum of inter-harmonic signals is obtained through short-time Fourier transform, and the local maximum value of the spectrum in the frequency direction is detected. Then, based on the maximum frequency of the spectrum, a new frequency redistribution operator and synchronous extraction operator are constructed. It combines the operators with ridge detection for the decomposition of harmonic/inter-harmonic signals, so as to obtain a series of intrinsic mode function (IMF) components. Finally, the instantaneous amplitude and frequency of the IMF components is obtained by using the Hilbert operator. Meanwhile, according to the instantaneous frequency mutation point in the spectrum, the starting and ending time of transient harmonics/inter-harmonics is located accurately. Based on a low signal-to-noise ratio (SNR), the wavelet packet method (WP), Hilbert Marginal Spectrum method (HMS), synchrosqueezing wavelet transform method (SST), the Hybrid SST method (HSST), enhanced empirical wavelet transform (EEWT) and the proposed method are used to identify the harmonic/inter-harmonic parameters, respectively. The experimental results show that the proposed LMSST method can effectively separate the steady-state and transient harmonic/inter-harmonic signals, and has higher detection accuracy and better noise robustness.

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Section: Introductionmentioning

confidence: 99%

Archives of Electrical Engineering

Sun,

Song,

Jin

2022

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“…Therefore, it is necessary for MGs to propose improved harmonic compensators to avoid a threat to the distribution network in terms of power quality and stability issues. To cope with harmonic distortions in MGs, numerous harmonic compensation approaches are presented in the literature [14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Using the embedded load observer system, MG harmonic compensation can be performed.…”

Section: Introductionmentioning

confidence: 99%

“…Experimental results show that the applied control method is quite effective [14]. The pre‐filter phase‐locked loop (PLL) has been investigated in terms of inter‐harmonic perturbations in order to increase the accuracy of phase extraction in voltage source inverters (VSI) [15]. Harmonic and inter‐harmonic detection of the system in power grids is performed using the fast Fourier transform (FFT) algorithm in [16].…”

Section: Introductionmentioning

confidence: 99%

A novel control approach for harmonic compensation using switched power filter compensators in micro‐grids

Khosravi

Abdolmohammadi

Bagheri

et al. 2021

IET Renewable Power Gen

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This paper presents a new harmonic compensation system using filter compensator devices in a hybrid micro‐grid (MG). In order to reduce the amplitude of current and voltage harmonics, two separate systems, including a switched power filter compensator (SPFC) and a switched active power filter (SAPF) have been used in the AC side of the MG. The gain coefficients of both SAPF and SPFC modules (with different controllers) using meta‐heuristic algorithms are optimized and applied for three harmonic loops of voltage, current and controller error to obtain an optimal response for reducing the harmonic amplitude of current and voltage. The objective function, containing controller error, current and voltage harmonics is defined and followed by the optimized coefficients for the PID controller of each of the SAPF and SPFC modules. To find the best answer to this problem, the related gains using four meta‐heuristic algorithms, including artificial bee colony (ABC), particle swarm optimization (PSO), harmonic search (HS), and differential evolution (DE) are optimized and compared. The simulation results show that using the proposed method, the total harmonic distortion of the system can be significantly reduced.

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