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Wide Area Monitoring System - Planning, Strategy and Implementation in Thailand's Power Grid

Electricity Generating Authority of Thailand THAILAND SUMMARY Power system stability is the major concerned in Thailand's power grid. Nowadays, the monitoring of the system based in the steady state with the SCADA system which cannot display the dynamic phenomena of the power system. The system's behaviors are forecasted by using the off-line power system simulation tool which is uncertainty in accuracy parameters and the roughly approximation. In some cases, the system operators need to know the continuous and detailed dynamic data to make the decision to manage the system. With Phasors Measurement Unit (PMU) technology, the system can be monitoring and focus on the angles and phasors with the time interval in dynamic state. PMU will show the dynamic data of the individual buses in the system for the system operators. This information will be useful for responding on the system situation suitably. PMUs also can use as the system analyst tool on the operation of the equipment in the system such as the controller of the generator, FACTS devices. PMU is the one of the smart grid road map to provide the data for the system operator to managing the system as the wide area monitoring system. Wide area monitoring system is the observation system on the dynamic phenomena which can inform the operators to understand the whole system behavior. The wide area-293-monitoring consists of PMU, the communication system and the data center to analyst and display the information. The wide area monitoring system started on the system study on the system's constraint and the stability problem to locate of PMU installation over the power system to investigate the system phenomena and stability. The concept of implementation the wide area monitoring will be focused on the detection and monitor the problem in the system for system operator. This paper represents the wide area monitoring system using the PMU technology in Thailand as planning, strategy and implementation including the experience on the dynamic behavior of Thailand's power system. The wide area monitoring project is not only benefit for the system operator for supervising the event in the system as the dynamic view's point, but also use to observe and analysis the dynamic behavior of Thailand's power grid in varied scenarios. The wide area monitoring system will be the improvement method for the system security, stability and reliability of Thailand power grid as a whole.