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A hybrid approach of load modeling based on statistics and typical models applying system response records under abnormal conditions is proposed in the paper. The major idea is to define load classes according to load composition, reproduce the composite loads in EMTDC to observe their characteristics, find static parameters from least squares methods, get motor parameters by weight average, and then...
This paper presents the phenomenon of delayed voltage recovery in power system of Saudi Electricity Company Western Region (SEC-WR), resulting from motor stalling of large air-conditioner (A/C) loads after faults. Parameters of the air-conditioning model are tuned successfully and reasonably by comparing simulation results with the dynamic system monitor (DSM) recorded disturbances. To solve this...
This paper presents an investigation into the relationship between voltage fluctuation and inter-harmonics in distribution network based on modulation theory. It is verified by Matlab/Simulink simulation and physical tests. The modulation theory, commonly used for analysis of harmonics, is used to analyze the inter-harmonics. A switching function of a rectangle waveform is used to describe a diode...
Equivalent of multi-winding isolating transformers used in cascading power electronic devices havenpsilat gotten enough attention. In the paper, several sufficient conditions for radial equivalent of those transformers are discussed in detail, which are helpful for manufacturers to design and make such a transformer having radial equivalent circuit. Error analysis shows the effects of nonideal mutual...
A practical ride through scheme bases on super capacitor energy storage system for ASD (adjustable speed drive) equipment is presented in this paper. The topology of ASD discussed adopts AC-DC-AC structure and 12 pulses diode rectifier as input interface. Super capacitor (SC) module connects to inverter DC bus to support DC voltage while power quality problems such as voltage sag or short-term outage...
The paper studies a practical project of 2 MVA dynamic voltage restorer on the basis of transformer-less cascade multilevel topology, it discusses each part working principle of DVR, but also provides a practical voltage sag problem solving scheme for a 6 kV feed line based on proposed cascade structure. EMTDC/PSCAD based simulation results verify the validity of proposed scheme
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