Harmonic Virtual Impedance Design for Optimal Management of Power Quality in Microgrids

Gothner, Fredrik; Pérez, Javier Roldán; Torres, Raymundo; Midtgård, Ole-Morten

doi:10.1109/tpel.2021.3065755

Cited by 22 publications

(11 citation statements)

References 32 publications

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“…Apart from power sharing, some recent work has focused on power quality enhancement of islanded microgrids, such as adding a secondary regulation though the communication system [11][12][13][14][15][16] and powerquality orientated virtual impedance control based on local measurements. The latter is the focus of this paper because of its noncommunication feature, and the related literature is reviewed here.…”

Section: Introductionmentioning

confidence: 99%

Power quality enhancement in islanded microgrids via closed-loop adaptive virtual impedance control

Wang

Tang

et al. 2023

Prot Control Mod Power Syst

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The high proportion of nonlinear and unbalanced loads results in power quality issues in islanded microgrids. This paper presents a novel control strategy for harmonic and unbalanced power allocation among distributed generators (DGs) in microgrids. Different from the existing sharing strategies that allocate the harmonic and unbalanced power according to the rated capacities of DGs, the proposed control strategy intends to shape the lowest output impedances of DGs to optimize the power quality of the microgrid. To achieve this goal, the feasible range of virtual impedance is analyzed in detail by eigenvalue analysis, and the findings suggest a simultaneous adjustment of real and imaginary parts of virtual impedance. Because virtual impedance is an open-loop control that imposes DG to the risk of overload, a new closed-loop structure is designed that uses residual capacity and absorbed power as feedback. Accordingly, virtual impedance can be safely adjusted in the feasible range until the power limit is reached. In addition, a fuzzy integral controller is adopted to improve the dynamics and convergence of the power distribution, and its performance is found to be superior to linear integral controllers. Finally, simulations and control hardware-in-the-loop experiments are conducted to verify the effectiveness and usefulness of the proposed control strategy.

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Section: Introductionmentioning

confidence: 99%

Power quality enhancement in islanded microgrids via closed-loop adaptive virtual impedance control

Wang

Tang

et al. 2023

Prot Control Mod Power Syst

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“…The output results indicate the proper performance of the above system [11]. To cope with harmonic distortions in the power grid and especially MGs, numerous harmonic compensation approaches are presented in the literature [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. For harmonic mitigation, two elements, active power filter and super capacitor, are investigated in [12].…”

Section: Introductionmentioning

confidence: 99%

“…The method of optimizing the shunt active power filter controller has been used to improve the harmonics of the system [13]. An optimization algorithm for adjusting the virtual impedances of harmonic distributed generations (DGs) in multi‐bus MG (to improve the voltage quality) is presented in [14]. This optimization algorithm can be configured for any degree of harmonic current sharing between DGs.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of power quality issues for a hybrid AC/DC microgrid based on optimization methods

Khosravi¹,

Echalih

Baghbanzadeh

et al. 2022

IET Renewable Power Gen

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The purpose of this paper is to study the harmonic behavior of hybrid microgrids (MGs). To achieve the desired goal, a modified active power filter (MAPF) and a power filter compensator kit (PFCK) modules have been used to improve the harmonics of the AC part of the system. The main challenge and feature of this research is the optimization of MAPF and PFCK controller gain coefficients hierarchical, using Harris hawk optimization (HHO), grasshopper optimization algorithm (GOA), artificial bee colony (ABC), and differential evolution (DE), respectively. Following, this technique was applied in the three control loops including, voltage and current harmonics, and system controller error to reduce the range of the mentioned harmonics to the permissible range. The method will be interesting considering that the PI and PID tuning is based on parallel feed‐forward. The programmed objective functions include the three components current THD, voltage THD and controller error hierarchically. From the point of view of the MGs hierarchical control, the method presented in this study will be implemented in the second level of hierarchical control. In order to improve the operation of the DC part of the grid, a boost converter module (BCM) has been introduced in the form of a new synchronization scheme. The output of the simulation shows the reduction of the harmonic amplitude of the system by the mentioned modules.

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“…With a high proportion of new energy generation and nonlinear power electronics connected to the grid, the impact of harmonics and interharmonics on power quality is of increasing concern [1]. Harmonics represent grave hazards, such as motor noise, voltage deviation and resonance for transformers, motors, arc furnaces, metering instruments and other industrial equipment [2][3][4]. Moreover, harmonics can also result in grid-voltage fluctuations as well as the flicker, resonance, and over-zero shifts in the voltage waveform [5,6].…”

Section: Introductionmentioning

confidence: 99%

Harmonics and Interharmonics Detection Based on Synchrosqueezing Adaptive S-Transform

Lou

et al. 2022

Energies

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The integration of renewable energy generation and nonlinear power electronic equipment into the grid brings about complex harmonics and interharmonics problems. The amplitude and frequency of harmonics and interharmonics should be detected by high time-frequency (T-F) resolution methods owing to their time-varying transient features. In this paper, a synchrosqueezing adaptive S-transform (SAST) method is proposed to detect the parameters of harmonics. Firstly, the time-frequency spectrum (TFS) of the harmonic signals is acquired by an adaptive S-transform (AST) algorithm. The TFS results are then subjected to synchronous compression, so as to achieve higher time-frequency representation precision. The detection results of the simulation signals show that SAST can achieve a better time-frequency resolution than the S-transform (ST) and synchrosqueezing short-time Fourier transform (SSTFT). In addition, the application of SAST to the analysis of experimental signals also suggests its superiority in the parameter detection of harmonics, especially for the time-varying interharmonics.

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Harmonic Virtual Impedance Design for Optimal Management of Power Quality in Microgrids

Cited by 22 publications

References 32 publications

Power quality enhancement in islanded microgrids via closed-loop adaptive virtual impedance control

Power quality enhancement in islanded microgrids via closed-loop adaptive virtual impedance control

Enhancement of power quality issues for a hybrid AC/DC microgrid based on optimization methods

Harmonics and Interharmonics Detection Based on Synchrosqueezing Adaptive S-Transform

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