Impact of photovoltaic and biogas power plant on harmonics in distribution network

Klaić, Zvonimir; Knežević, Goran; Primorac, Mario; Topić, Danijel

doi:10.1049/iet-rpg.2019.0528

Cited by 12 publications

(6 citation statements)

References 18 publications

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“…Harmonic resonance conditions can be affected by load level and the amount of renewable generation, as well as capacitor switching and changes in the network configuration [25,26].…”

Section: Proposed Methodology For Monitoring Harmonic Resonance Condi...mentioning

confidence: 99%

Optimal harmonic resonance monitoring in electrical network considering area of harmonic pollution and system uncertainty

Shakeri,

Koochi,

Esmaeili

2024

IET Generation Trans & Dist

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This paper proposes an optimization approach for allocating power quality monitors (PQMs) aiming to monitor all harmonic resonance conditions while taking power system uncertainties into account. The placement approach utilizes the frequency scan response for calculating impedances over a range of frequencies and consequently determining harmonic resonance conditions. Thereby, it is capable of building binary matrices, which include harmonic resonance conditions. Also, by utilizing the union operator at binary matrices, power system uncertainties such as photovoltaic generation and load level can be considered in the allocation method. The placement approach is expressed as a linear problem that determines the best locations of PQMs and their optimal number so that they monitor all harmonic resonance conditions. Besides, by considering the area of harmonic pollution of non‐linear loads in the proposed method, owners of electrical networks can find a solution with fewer PQMs to monitor harmonic resonance orders inside a particular area of the network. The performance of the presented approach is demonstrated using the 15‐node distribution network and a real electrical network, as well as a real large electrical network in Iran. Results show that the proposed method suggests fewer PQMs to monitor harmonic resonance conditions compared to previous methods.

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“…Harmonic resonance conditions can be affected by load level and the amount of renewable generation, as well as capacitor switching and changes in the network configuration [25,26].…”

Section: Proposed Methodology For Monitoring Harmonic Resonance Condi...mentioning

confidence: 99%

Optimal harmonic resonance monitoring in electrical network considering area of harmonic pollution and system uncertainty

Shakeri,

Koochi,

Esmaeili

2024

IET Generation Trans & Dist

View full text Add to dashboard Cite

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“…Uncertainty of loads and photovoltaic (PV) resources can cause power quality problems [21,22]. During periods of demand, it is common for renewable energy sources to be unavailable.…”

Section: Load and Photovoltaic Resources Uncertaintymentioning

confidence: 99%

Multi‐criteria decision‐making approach for optimal and probabilistic planning of passive harmonic filters in harmonically polluted industrial network with photovoltaic resources

Khajouei

Shakeri

Esmaeili

et al. 2023

IET Renewable Power Gen

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Nowadays, nonlinear loads are widely employed within the industrial applications that cause harmonic distortions in the network. Passive harmonic filters stand out as the preeminent and cost‐efficient remedy for mitigating the impact of harmonic distortions. Any changes in power system conditions such as load variability and photovoltaic resources uncertainty have a significant impact on the harmonic conditions which can affect the quantity and positioning of passive harmonic filters. Hence, in this paper, a method including an innovative optimization problem is proposed for probabilistic planning of passive harmonic filters considering system conditions variability, which is solved by heuristic methods and multi‐criteria decision‐making techniques. By doing this, a solution is obtained where grid losses and the passive harmonic filter costs are minimized and the power factor and frequency response are improved on selected buses. Also, in this paper, the index that gauges the severity of total harmonic distortion is proposed to determine the worst case of the network in terms of harmonic distortions which is so vital for system operators, especially the systematic approach to designing passive harmonic filters. To indicate the efficiency of the proposed approach, the electrical system of an actual Iranian copper mine of significant scale is employed, featuring the integration of non‐linear loads.

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“…However, as traditional distribution systems were designed as passive networks, high penetration of DERs can cause some undesirable conditions, such as bidirectional power and fault current flows, which can consequently cause maloperation of protection equipment as well as potential danger to the maintenance personnel. Moreover, placing small-scale renewable-based DERs at highly dispersed locations all over the grid proved to be an uneconomical solution [4][5][6]25].…”

Section: The Microgrid Conceptmentioning

confidence: 99%

Short-Circuit Analysis of DER-Based Microgrids in Connected and Islanded Modes of Operation

2021

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Since microgrids should be able to smoothly operate in two distinct modes—grid-connected and islanded, their fault currents can widely fluctuate depending on the operational mode. When the microgrid is connected to the grid, the highest fault current, by far, is supplied by the utility grid. In this mode, the fault current contribution from distributed energy resources (DERs) is less than 20%. However, when the microgrid switches to the islanded mode, the fault current contribution from the utility grid is lost and DERs are the sole fault current sources. Thus, the overall fault current in the islanded mode is multiple times lower when compared to the grid connected mode. Moreover, most of the DERs are inverter-based, with limited fault currents, which further reduces the overall fault current in the islanded mode. With the rapid rise of the microgrid penetration around the globe, this phenomenon can adversely influence the relay protection, and thus the microgrid fault current needs to be precisely analyzed. Therefore, the main purpose of this paper is to thoroughly analyze the fault current differences in two distinct operation modes of a microgrid, and to consequently derive conclusions regarding the required improvements in fault calculations and relay protection analysis in emerging microgrids. A representative microgrid test bed is developed and modelled using the in-house developed software as well as in a state-of-the-art hardware-in-the-loop environment. Several different short-circuit faults were simulated and analyzed in both grid-connected and islanded modes. The results show that the fault currents significantly differ depending on the operating mode, and thus highly influence the protection system. Moreover, test results show that the fault calculation algorithms aimed at radial distribution grids, mostly used for microgrid fault calculations in the available literature, need to be further improved to provide precise and time-efficient results when the emerging microgrids are considered. These results provide a valuable insight into the current state of the microgrids’ fault calculation and protection and reveal several important directions for future research.

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Impact of photovoltaic and biogas power plant on harmonics in distribution network

Cited by 12 publications

References 18 publications

Optimal harmonic resonance monitoring in electrical network considering area of harmonic pollution and system uncertainty

Optimal harmonic resonance monitoring in electrical network considering area of harmonic pollution and system uncertainty

Multi‐criteria decision‐making approach for optimal and probabilistic planning of passive harmonic filters in harmonically polluted industrial network with photovoltaic resources

Short-Circuit Analysis of DER-Based Microgrids in Connected and Islanded Modes of Operation

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