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The traditional Electromagnetic Transients Program (EMTP) is very slow for the lager-scale power systems simulation due to the small time step. To accelerate the EMTP simulations speed, a novel multi-rate method is proposed. This method is based on the rotating transformation of single phase coordinate and frequency reducing. The part of power electronic devices is simulated with a small time step,...
This paper proposes a direct virtual power control algorithm based on the direct power control with space vector modulation (DPC-SVM) for offshore wind farm connected VSC converter. This control algorithm extends the scope of the traditional DPC. By introducing the virtual power, the DPC can work before the wind farm starts up when the AC side of VSC is open and the voltage stability is achieved as...
Voltage sag has become the main culprit to high quality power supply. Solid Static Transfer Switch (SSTS) for duplex feeding is a kind of power device which can effectively alleviate the voltage sags. SSTS will switch sensitive loads to the alternate source with better power quality when the preferred source is suffering voltage sags or interruption. In this paper, the operational principle of SSTS...
DG based on Photovoltaic System Generation (PVS) has the probabilistic output power relied on natural conditions, the traditional deterministic load flow is not a suitable tool for the analyzing and maintaining distribution system. Aiming at this problem, this paper applies a probabilistic power flow (PLF) method to evaluate the influence of distributed generation with PVS. Firstly, the probabilistic...
By thermogravimetric analysis (TGA) study, the characteristics of oxygen-enriched air combustion of paper mill sludge were investigated. Experiments on oxidative of paper mill sludge were performed under different atmospheres at 20°C/min. There are two distinct decomposition processes were observed from the obtained thermogravimetric curves. One of them centered on 320–350°C with a weight loss of...
In this paper, the co-combustion behaviour of sewage sludge with straw and coal were carried out in a thermogravimetric analyzer under different atmospheres and at different heating rates (10, 20 and 40Kmin −1 ) in the temperature range from ambient temperature to 1000°C. TG and DTG curves were analysed. The Flynn–Wall–Ozawa’s (FWO) and Kissinger–Akahira–Sunose’s (KAS) isoconversional methods...
Ultra-high voltage direct current (UHVDC) converter stations produce high levels of carrier frequency noise which can cause harmful interference to power-line carrier and open-wire carrier systems. The noise models of converter valves and converters arranged with two 12-pulse valve groups in series per pole are given. Calculation results of noise interference on dc pole line and electrode line for...
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