Power system strength for renewable energy resource hosting capacity enhancement

• Main Author: Li, Jiancheng
• Other Authors: Foo Yi Shyh, Eddy
• Format: Thesis-Master by Coursework
• Language: English
• Published: Nanyang Technological University 2024
• Subjects: Engineering; System strength; Short-circuit ratio; PSCAD simulation
• Online Access: https://hdl.handle.net/10356/178108
• Institution: Nanyang Technological University

This dissertation investigates the critical issue of enhancing power system strength to facilitate the hosting capacity of renewable energy resources. With the increasing integration of RES such as wind and solar power into the electrical grid, system strength—defined as the grid’s ability to maintain stable voltage levels under dynamic conditions—becomes a paramount concern. This study aims to address the challenges posed by the integration of RES, which often leads to reduced system strength, characterized by lower short-circuit levels and increased susceptibility to voltage fluctuations. The research begins with a comprehensive literature review, examining the theoretical foundations of system strength and its significance in the context of renewable energy integration. It explores various factors influencing system strength, including the SCR and the X/R ratio, and their impact on grid stability. The dissertation then systematically evaluates different strategies to enhance system strength, such as the deployment of synchronous condensers, the utilization of FACTS devices, and the integration of BESS. Each solution is assessed for its effectiveness in improving grid resilience, operational flexibility, and the ability to support higher levels of renewable penetration. Through detailed system modeling and simulation, the dissertation presents an empirical analysis of these strategies, using advanced tools like PSCAD to simulate grid behavior under various scenarios. The simulations focus on the dynamic responses of the grid to renewable energy fluctuations and fault condiiii tions, providing insights into the performance of different system strengthening solutions. The findings of this research contribute to the broader understanding of power system dynamics in the era of renewable energy, offering practical recommendations for utilities, grid operators, and policymakers to enhance system strength. The dissertation underscores the necessity of a proactive approach to grid management and infrastructure investment to ensure reliable and sustainable energy supply in the face of rapidly evolving energy landscapes.