article · Energies
Modern electrical distribution networks increasingly incorporate renewable distributed generation units, such as solar, wind, and biomass, to meet rising energy demands. However, these integrations often introduce high fault currents that threaten grid stability and reliability. Fault current limiters offer an effective mechanism to restrict or interrupt these excessive currents across low- and medium-voltage networks. Available hardware ranges from conventional reactor and pyrotechnic types to solid-state and advanced superconducting systems. Optimisation techniques are essential for determining the best placement and sizing of both generation units and limiters amidst renewable energy intermittency. When tested on a real-world case study using Egypt's East Delta Network, optimal co-allocation dramatically reduced system power losses from 3.59 per cent to 0.296 per cent of total load, while fully neutralising an associated 20.93 per cent increase in fault current levels.
Adding renewable energy to regional power grids can create dangerous electrical surges during network faults. Using fault current limiters alongside smart placement strategies protects equipment and stabilises the grid. This approach allows utilities to connect more clean energy sources like solar and wind without sacrificing network reliability or suffering heavy energy losses during distribution.
The work is relevant to distribution network operators, utility engineers, and grid equipment manufacturers seeking to integrate renewable generation safely. While the review covers established and emerging limiter technologies, the optimisation approach is applied and tested using data from Egypt's East Delta Network. Commercial deployment would depend on utilities adopting these planning methods and investing in physical fault current limiter hardware, such as solid-state or superconducting devices.
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To cope with the increasing energy demand, power systems, especially distribution networks, face many challenges. Recently, these networks have become complex and large, and their stability and reliability are not easy to be handled. The integration of renewable energy resources and at the same time limiting their accompanied high fault currents is one of the approvable suggestions. Many solutions have appeared to restrict the fault currents, but fault current limiters (FCLs) arise as an efficient and promising solution to whether to interrupt or limit the fault currents to allowable limits. This paper presents a literature review of the integration of renewable energy resources as distributed generation units (DGs) and FCLs in distribution networks. The DGs can be categorized based on their size and ability to deliver active or reactive power in addition to their fuel. All of solar, wind, water, biomass, geothermal, and fuel cell are utilized as the main engine for these units. Additionally, a survey about FCLs is provided, including their diverse types and applications in either medium- or low-voltage networks. FCLs are divided into reactor, pyrotechnic, non-superconducting (solid state), and the last-developed ones, superconducting FCLs. In addition, the implemented optimization techniques are summarized to correctly employ both FCLs and DGs. These techniques vary between classical and modern, whereas more methods are developed to suit the renewable energy intermittence and uncertainty and the power system operators’ aspirations. Moreover, in this paper, the optimal allocation of diverse types of DGs correlated with FCLs is presented and applied to the real Egyptian distribution network of the East Delta Network (EDN). The results show the avails obtained where the power losses are significantly reduced, with respect to the total load, from 3.59% in the initial case to 0.296%. In addition, the fault current returns to its initial value, removing the percentage of increase of 20.93%.
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DOI: 10.3390/en15207648
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