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The on-line estimation of symmetrical components from network voltages and currents is widely used in the field of power quality monitoring and improvement of relevant disturbances, especially by CUstom Power Systems (CUPS). This paper proposes a new fast-converged estimation approach, which directly extracts amplitudes and phase angles of symmetrical components of desired frequencies from harmonic-distorted...
Taking the shunt capacitance of a transmission line, compensated by a static synchronous series compensator (SSSC), as well as other affecting factors into account, and in case of a single line to ground (SLG) fault when the compensator resides in the fault path, this paper derives a precise formula for the apparent impedance seen by the ground element of a distance relay. In the case where the SSSC...
The Synchronous Reference Frame (SRF) has been known as one of the most common methods of voltage sag compensation. Despite suitable performance in 3-phase voltage sags mitigation, the application of the SRF does not work that well in unbalanced situations. This paper addresses this problem, through the use of a novel control strategy based on the pre-fault compensation theory. In this strategy, not...
The main duty of a Dynamic Voltage Restorer (DVR) is protection of sensitive loads against voltage disturbances, especially voltage sags and swells. DVR should possess necessary response time in restoring load bus voltage to avoid load interruptions. One of the most important factors that affects the performance of DVR is the estimation approach which is used in control unit of this compensator. This...
Harmonics tracking as well as symmetrical components identification are of the great importance in Power Quality (PQ) evaluation and improvement. In this paper, a new approach for fast and accurate estimation of fundamental and harmonic symmetrical components is presented. Firstly, the three-phase input signals are simplified into a real-imaginary system using Park vector. Then, the resulted signal...
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