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The 275kV regional interconnection HVTL Mambong (Sarawak) to Bengkayang (West Kalimantan) imposes challenges to the GSO (Grid System Operators) to maintain the voltage levels and voltage unbalance within limits. We suggest how to design the strategies for stable operations under unbalance system situations for the power system interconnection. According to the existing concept, the transposition of transmission line phases is intended to reduce the current and voltage unbalance in the normal electrical system operating mode and to limit the obstructive influence of transmission lines on the transmission channel of low frequency. The length of the transposition process for lines with horizontal phase allocation should not exceed 24 km, and should not exceed 48 km at triangle allocation. The discrepancy in its parameter at one transposition interval is not completely balanced over the entire process, since the line is distributed at different conditions at one of the intervals. For a period in total the resulting parameters of line phases are different. Thus, even at the exact symmetry current and voltage systems at one end of the full transposition cycle, these systems at the other end become imbalances. This paper provides an analysis by applying the EMT Evaluation (Electromagnetic Transients Analysis) of the transposed 150 kV (Tayan-Sandai) transmission line of 162 km length. In this way, the findings obtained attest to the continuity of the inquiries and can also be used to address the problems of the specification of acceptable unbalance rates in longer lines.

In the SEB interconnection and renewable energy sources, the West Kalimantan power system should prepare large reserve capacities for unexpected transmission line disconnection or connection. We suggest how to design supply- demand balance strategies for stable operations under unexpected situations for the SESCO-West Kalimantan power system interconnection and large-scale PLTU insertion in the West Kalimantan power system. They are connected in parallel for the power generation system. In Transmission Control Center, these ESSs are installed on idle capital of a substation to regulate the frequency. In Sektor Kapuas (Generation Coordinator), they are installed on a generation plant. At least four biomass power generation (PLTBm) are scheduled to be completed in West Kalimantan by 2019 as part of a high biomass-potential resources such as wood, palm oil, and agricultural residues, production utilized by developers of power plants/independent power producer (IPP). Because of these energy exchanges, both environmental problems and the supply/demand unbalance of energy may increase in SEA countries. In addition, the control mechanism of interconnection system responsible for maintaining the system frequency to the nominal value and the real power interchange between balancing authority areas to the scheduled values is referred to as Automatic Generation Control (AGC). AGC is a system for adjusting the power output of multiple generators at different power plants, in response to changes in the load. This paper presents the SESCO-West Kalimantan power system interconnection (SEB-PSI), distributed energy resources-based operation strategies targeting supply-demand balance and performance of the AGC system in Indonesia and Malaysia.