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In this paper an electric arc model is presented, model which depended of the desired active power of the electric arc. The model was implemented in PSCAD — EMTDC as a custom embedded component defined by the user. The components are designed, implemented and can be saved into a PSCAD library in order to be used in simulation of electric arc schemes. The performances of the model were also studied...
Electric arc furnace and its influence in the power system are studied in this paper. Two models that allow to evaluate its behavior during steady state are shown. These models has different complexity level; the first model takes into account the main nonlinearities of the load; the other assumes that current-voltage characteristic in the arc is piece-wise linear. Electromagnetic transients program...
Influences of large impact loads including high-speed railways, high-capacity arc furnaces and high-voltage high-capacity motors start-up on power quality of grid are researched deeply in this paper. Firstly, the characteristic and modeling of this three typical impact loads are studied. Secondly, simulation influences of these three loads on power quality of grid are implemented and compared with...
When only measurements at the source of flicker are available, flicker levels in other network nodes can be obtained with stationary calculation methods. When dealing with multiple flicker sources it is vital to assess their cumulative contribution to flickers levels in network nodes using flicker summation factors. The paper presents a case of two arc furnaces causing flicker in a particular node...
Stationary and dynamic flicker calculation methods are often used for assessing flicker levels throughout the network. This paper introduces a method for calculating flicker levels in the network by analyzing the propagation of voltage interharmonics. Calculated flicker levels are compared with the measurement results. Simplifications of this method are tested on numerous examples.
The present paper introduces some simulation methods for flicker propagation assessment. The first method is based on current injection into the system matrix of the studied grid. Only one computation is enough to get all nodal voltages of the grid. We can thus deduce flicker propagation coefficient between any two nodes by the ratio of the relative nodal voltages. The second method requires two load-flow...
This paper deals with the design, analysis and simulation of an online voltage envelope estimator and an online feed-forward neural network (FFNN) controller based distributed static compensator (DSTATCOM) controller. Existing controllers such as PI controller and offline neural network controller are fixed structures and provide satisfactory control only for certain problems for which they are designed...
Under the scope of the IEC technical report 61000-3-7, the principles to assess flicker emission limits for the connection of fluctuating loads to the public network power system have been outlined. This technical report gives also the definition of the flicker emission level. But this report does not explain how to measure and assess the flicker emission level. Actually, because of the existence...
Voltage flicker and harmonics are the power quality problems which are introduced to the power system as a result of nonlinear and stochastic behavior of the arc furnace operation. In the first part of the paper, different arc furnace models with different level of complexity, for flicker study are reviewed. Simulation results are also provided. In the second part of the paper, a new developed time...
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