Study on The Novel Transient Bus Protection Based on Morphological Top-bottom-operator

Abstract

Abstract-A novel transient component bus protection based on mathematical morphology is presented in this paper, which takes the morphological max top-bottomoperator of current traveling wave to fast distinguish the bus internal fault from the external fault. The method is based on the principle that the high frequency component of transient traveling wave caused by bus external fault will be attenuated by the bus capacitance but the traveling wave caused by bus internal fault changes slightly. Simulation is carried out with the electromagnetic transient simulation software PSCAD/EMTDC, the result verifies the bus protection is reliable and accurate. The novel bus protection also can treat lightning failure or lightning disturbance happened on transmission lines as bus external fault, without malfunction.

Enhancement of Voltage Regulation and Transient Stability of Six Phase STATCOM using Decoupled Current Control Strategy

“…Generation of reference signal by using a decoupled controlling will enhance transfer behavior of each output variable. A detailed description of crosswise decoupling control by means of stationary state feedback was first developed in [15][16][17][18].…”

Fast transient‐based detection of busbar faults employing improved morphological gradient

“…However, CT is powerful in transforming high‐frequency current signals up to 50 kHz [7]. In other words, protective algorithms based on transient components using current and voltage waves and/or voltage signals are impractical and only and just only, current signal with the sampling frequency not larger than 100 kHz is the best input for algorithms that are based on transient components. Criterion #5: Rule‐based approach : The attempts for transient‐based busbar protection schemes, only represented by simulation results, can be divided into pattern‐recognition based [8, 9, 15] and rule‐based approaches [3–5, 16]. Inherently, the former approach requires massive simulations for training; while, generally, it cannot guarantee 100% accuracy in detecting faults of different conditions and discriminating internal and external faults. In Table 1, according to the aforementioned requirements, the comparison between some busbar protection algorithms that are based on transient components as well as the proposed algorithm has been shown.…”

“…Criterion #5: Rule‐based approach : The attempts for transient‐based busbar protection schemes, only represented by simulation results, can be divided into pattern‐recognition based [8, 9, 15] and rule‐based approaches [3–5, 16]. Inherently, the former approach requires massive simulations for training; while, generally, it cannot guarantee 100% accuracy in detecting faults of different conditions and discriminating internal and external faults.…”