Inclusive Design and Implementation of Online Load Angle Measurement for Real-Time Transient Stability Improvement of a Synchronous Generator in a Smart Grid

Smart grid applications have been extended to perform supervisory functions within a short and efficient time. Insecure operating conditions are likely to happen in power systems. Reducing the risk associated with this condition, adaptive countermeasures, and self-healing actions are made using the infrastructures of the smart grids. Real-time transient stability assessment is classified into these kinds of applications. Corrective control actions could be taken based on the postfault rotor angle deviations. In this paper, a novel real-time digital signal processing (DSP)-based load angle measurement instrument for synchronous generators is discussed. This real-time instrument is designed for high-precision online applications. In this approach, input signals contain the rotor's shaft position and zero crossing of generator terminal voltage is applied to a DSP board to achieve the online load angle. The proposed load angle measuring instrument is installed and used in many power plants in Iran. The experimental results demonstrate the high accuracy and fast response of the proposed instrument.