OPTIMAL PLACEMENT ANALYSIS OF FREQUENCY CONVERTER BASED ON COMPOSITE SYSTEM RELIABILITY IN REMOTE INDUSTRY SYSTEM

• Main Author: Bernardus Simamora, Niko
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/83740
• Institution: Institut Teknologi Bandung

HVDC is increasingly being adopted as a solution for interconnecting areas due to its ability to connect asynchronous systems and provide power control that mimics conventional generators. In the case of Indonesia, a remote industrial system in Sumatra is experiencing load growth and has the option to draw power from the national Sumatra system. However, due to frequency differences, the use of HVDC is crucial. The Generation Expansion Planning has proposed six converters to be interconnected, but not their locations. This study will attempt to determine the most reliable interconnection locations for the converters in this system. The chosen converters are Modular Multilevel Converters due to their high modularity. The converter reliability modeling considers voltage levels, the number of modules, and redundancy strategies. This modeling is then implemented at the power system level to obtain the best placement and interconnection combination at the available High Voltage (HV) substation options. This research proposes determining the best placement based on the reliability index with the minimum value. The optimal placement also includes the option to convert from HV interconnection to Medium Voltage (MV) interconnection. MV interconnection offers higher flexibility but tends to be more expensive. The sensitivity of interruption cost from the reliability analysis, investment, and maintenance costs, will yield the best combination of HV and MV converters. Techno-economic analysis suggests that at least one of the six converters remains economical if converted from HV to MV application.