Abstract
The increasing use of renewable energy sources (RES) and their integration into transmission systems requires extensive studies to get more benefits from these sources. Stability analysis is one of the most crucial issues in these systems, and therefore needs to be studied in depth. In this paper, an analytical study was conducted for the stability assessment of the Iraqi super grid after adding a solar power plant with a capacity of 1000 MW using both HVAC and HVDC links for comparison purposes. Thus, the objective of this study was to determine the best way to integrate RES into the power grid while improving its performance. The system’s stability was evaluated for two types of faults: line and bus disturbances. The strength of the grid and its ability to absorb the newly added energy was also studied. The simulations were performed with the PSS/E software using the Newton-Raphson method for a 500 km transmission line length. The results showed that the HVDC link outperforms the HVAC link in improving the overall performance of the power system.
Highlights
The electric power system faces new challenges, such as combating air pollution and reducing dependence on fossil fuels
The findings reveal that the ‘fault current’ in the HVAC transmission system is much higher than in the high voltage direct current (HVDC) transmission system for every given fault scenario
The outcomes of this study revealed that the power system in steady and transient states is more stable, and the application of the DR-HVDC reduces costs and increases the reliability of an offshore wind farm (OWF) compared to a conventional HVDC
Summary
The electric power system faces new challenges, such as combating air pollution and reducing dependence on fossil fuels. Excessive exploitation of natural resources has raised worries about greenhouse gas emissions, pollution, and harmful environmental consequences It emphasizes the sustainability of the generation necessary to fulfil the world’s energy demand in the following decades using non-renewable fossil fuels. HVDC transmission enables RES to transfer many thousand kilometres with low losses This method permits the integration of enormous amounts of solar energy into the existing power system [16]. This paper is structured as follows: Section 2 presents a power flow and short circuit level analysis of the HVDC and HVAC systems in the presence of large-scale renewable energy sources. The basic information of the PF solution is the voltage magnitude, the phase angle at each bus, and the real and reactive power flow in each transmission line Additional information such as current flow and power losses can be computed from these values.
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