Analysis of Hybrid AC/DC Distribution Network Under Adverse Conditions

Abstract

This paper comprehensively analyzes the system under different conditions and discusses some current protection strategies over the last decade. Also, the paper provides an overview of the hybrid AC/DC network and its advantages and states the different protection challenges of the hybrid microgrid (MG). The need to reduce climate-influencing emissions increases the number of renewable and decentralized power plants worldwide. Recently, hybrid MGs are gaining a lot of attention as they combine the best features of both AC and DC MGs. Integrating a hybrid MG to the distribution network offers countless advantages; however, it encounters several issues. One of the most critical issues facing hybrid MG technology is the development of a reliable protection scheme for both AC and DC sub-MGs and the coordination between them. Even though both AC and DC MGs significantly influence each other. Most recent research only focus on developing the protection schemes for DC MGs. The paper also offers a comparison of the system behavior under both healthy and faulty conditions. In addition, the effect of a fault in the AC-microgrid (MG) on the DC-MG and vice-versa are comprehensively illustrated.