Severity Assessment under Load Shedding to Thailand’s Power System in High Difference of Load and Generation Capacity Areas
Keywords:
Load shedding, Power flow congestion, N-1 contingency analysis, Power system securityAbstract
This paper presents severity assessment under load shedding to Thailand’s power system in high difference of load and generation capacity areas with n-1 contingency analysis. This impact study focuses in 2 areas which are the Eastern power system with a generation capacity greater than the load capacity at 6,072.08 MW and the Central power system with load capacity greater than the generation capacity at 8,471.87 MW. The study results will consider the number of equipment and quantity that violates the control values of the system and compare the results with the case of loss of a generator, a transformer and a transmission line. The study found that in case of load group shedding under a system with load greater than the generation capacity, the system will have higher power flow congestion than a system with higher generation capacity than the load capacity. This impact has 11 devices in violation of the control parameters and achieves a maximum load of 260.50%. In addition, it is possible to identify critical load groups and equipment in power transmission, and to rank critical areas for planning to improve power system security.
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