International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 05 | May 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 4021 SIMULATION OF HYBRID HVDC CIRCUIT BREAKER WITH SFCL FOR FAULT CURRENT LIMITING Prof. Falguni Shah 1 , Prof. Rachana J. Patel 2 , Fedrik Macwan 3 , Prof. Nupur Sinha 4 1 Assistant Professor, Electrical Engineering Department, L. D. College of Engineering, Gujarat Technical University, Ahmedabad, Gujarat, India 2 Assistant Professor, Electrical Engineering Department, L. D. College of Engineering, Gujarat Technical University, Ahmedabad, Gujarat, India 3 Assistant Professor, Electrical Engineering Department, L. D. College of Engineering, Gujarat Technical University, Ahmedabad, Gujarat, India 4 Associate Professor, Electrical Engineering Department, L. D. College of Engineering, Gujarat Technical University, Ahmedabad, Gujarat, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - Recently, studies on HVDC circuit breaker (CB) prototypes have become popular among power system researchers. In this paper, a novel hybrid-type superconducting DCCB model (SDCCB) is proposed. The SDCCB has a superconducting fault current limiter (SFCL) located in the main line, to limit the fault current. After the trip signal, Electronic (IGBT) switches located in the main line will commutate the fault current into a parallel line, where dc current is forced to zero by combination of IGBTs and surge arresters. To check performance of the SDCCB, a simulation analysis for SDCCB current interruption performance is done in MATLAB software for three different systems which are denoted as “Normal System,” “Strong System,” and “Very Strong System”. The current limiting by the SFCL notably suppressed the dc fault current and significantly reduced the current interruption stress for SDCCB components. Key Words: D.C circuit breaker (DCCB), High-voltage direct current (HVDC), Hybrid DCCB (HDCCB), Multi terminal HVDC, Superconducting fault current limiter (SFCL), Voltage source converters (VSC). 1. INTRODUCTION High voltage direct current (HVDC) technology is a key component in the future energy system based on renewable energy sources, such as wind and solar power which are often both volatile and remotely located and with the development of power electronics technology, HVDC system has attracted widespread attention of researchers. HVDC transmission line costs is less than an AC line and have a lower environmental impact because they require fewer overhead lines to deliver the same amount of power as HVAC systems. However, it is also true that HVDC terminal stations are more expensive due to the fact that they must perform the conversion from AC to DC, and DC to AC. But over a certain distance, the so called "break-even distance" (approx. 600 – 800 km), the HVDC alternative will always provide the lowest cost compared to HVAC system. Voltage Source Converter-High Voltage Direct Current (VSC- HVDC) is the most efficient and reliable method for electrical power transmission over long distances. The greatest challenge with VSC-HVDC system is very high short-circuit faults current which may damages the converter valves and the transmission network. Conventional DC breakers are not fast enough and reliable to provide adequate protection for DC faults on multi-terminal networks. Hence, good technology based HVDCCB is required to isolate faults. For fast fault elimination it is required to absorb fault current quickly. Some of the methods adopted for absorption and dissipation of energy are the use of resistors, metal oxide varistors and surge arrestors. In this paper, we have proposed a novel hybrid-type superconducting DCCB model (SDCCB), in which a conventional hybrid DCCB (HDCCB) is combined with the SFCL. Superconducting fault current limiter (SFCL) is an application of superconductivity concept. There are two types of SFCL, resistive and inductive. This paper will elaborate and discuss the advantages of resistive SFCL combine with hybrid DCCB over other topologies like LC circuit based DCCB, solid state DCCB and conventional Hybrid DCCB. 2. PROCEDURE FOR PAPER SUBMISSION Challenges: - HVDC transmission is associated with low DC reactance hence fault current rise to uncontrollable level. Breaking this huge dc fault current is the greatest challenge for MTDC protection system. For this reason, the main focus of HVDC CB research is on the mechanism of current zero creation across the interruption unit. So the main purpose of this topic is to study about the difference between AC and DC fault current level & getting knowledge by analysis & simulation of artificial current zero by different methods. The main objective of this paper is to develop a new topology for HVDC circuit breaker that eliminates use of any mechanical part or MOV.