Abstract
This paper presents a new approach for the real-time digital simulation of power electronic controllers in power systems. Digital controllers for power electronic systems present a problem when testing in real-time using a digital simulator due to the discrete nature of their outputs, which are not necessarily in synchronism with the time step of the simulator. The proposed algorithm combines the variable step-size numerical integration method with linear interpolation for the synchronization of a real-time digital simulator and a digital controller. It is shown that lack of such synchronization leads to inaccurate simulation results, specifically with regard to the fundamental and harmonics of the voltage and current signals. Sampling theory is used to model the interaction between a digital simulator and a digital controller. A pulse width modulated (PWM) voltage source converter (VSC) based reactive power compensator system is used as an illustrative example for the simulation.
Highlights
This paper explores the inherent characteristics of multigrounded three-phase four-wire distribution systems under unbalanced situations
Simulation results have illustrated the effects of neutrals and system grounding on the operation characteristics of multigrounded four-wire distribution systems
Author Affiliation: Arizona State University, AZ Abstract: The results and analysis of surface resistance measurements performed on nonceramic insulators (NCI) are presented in this paper
Summary
Author Affiliation: Arizona State University, AZ Abstract: The results and analysis of surface resistance measurements performed on nonceramic insulators (NCI) are presented in this paper. The goal of this study was to determine if the surface resistance measurement procedure can be formalized to ensure repeatable and reproducible results. The Task Force concluded that it is possible to establish a standard for surface resistance measurement in the laboratory. Such a standard is valuable since surface resistance provides: (1) an indication of aging on NCI housing material, and (2) a more sensitive indicator of true contamination severity on insulators than provided by conventional equivalent salt deposit density (ESDD) measurements.
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