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Higher harmonics are particularly important among disturbances of the power quality. Their primary source are nonlinear loads which process the energy of fundamental harmonic on the higher harmonics energy. Such load can be used in the stiffness test of the supply network. An arc furnace is one of more often met industrial nonlinear load. The paper deals with the balanced three-phase circuit of the...
In this paper, a model based fault detecting algorithm for detection of inter-turn short circuits in permanent magnet synchronous motors (PMSMs) is presented. Based on the PMSM model, the algorithm compares predicted values of the current space vector with the measurements to calculate an error vector, which will be used to detect the fault. A significant advantage of the developed algorithm is the...
In this paper we introduce a novel algorithm for harmonic steady-state analysis of power systems that is based on the equivalent split-circuit models recently introduced for power flow analysis. By using an equivalent circuit with current and voltage as the state variables, we extend the harmonic balance method that is used for nonlinear circuit simulation in the frequency domain to capture the frequency...
The design of high performance circuits with short manufacturing cycles and low cost demands reliable analysis tools, capable to accurately predict the circuit behaviour prior to manufacturing. In the case of nonlinear circuits, the user must be aware of the possible coexistence of different steady-state solutions for the same element values and the fact that steady-state methods, such as harmonic...
The paper deals with a frequency-domain model of memristor and its use for the steady-state analysis by means of the harmonic-balance method. The model is based on a polynomial approximation of its flux-charge constitutive relation, allowing analytical formulation of relations between spectral components of stimulus and response, both for periodic and quasi-periodic steady-state conditions. It is...
This paper addresses the steady-state and dynamic modeling of a three-level, neutral-point-clamped (NPC) voltage source converter (VSC) with active front-end (AFE) in a commercial 2.5 MW variable speed motor drive (VSD). The AFE of the modeled VSD adopts the selective harmonic elimination SHE-PWM technique with the optimization of inverter power capacity and power source quality for a wide-range VSD...
The paper deals with frequency-domain models of memristor, memcapacitor, and meminductor, and their use in the steady-state analysis by means of the harmonic-balance method. The models are based on a polynomial approximation of constitutive relations, allowing analytical formulation of relations between the spectral components of stimulus and response, for both periodic and quasi-periodic steady-state...
In this paper a method for the control of the stability of nonlinear circuits under large-signal conditions, including an analysis of the transient regime, is presented. It is based on the calculation of the conversion matrix, computed both from standard harmonic balance at steady-state large-signal regime and from a transient envelope simulation. This allows the direct design of the passive networks...
In this paper the harmonic balance method is considered in conjunction with the probe insertion technique. In general, the nonlinear equations modeling the circuit in the frequency domain are solved with the Newton iterative method. Conventional probe insertion technique has become popular and implemented in commercial analog simulators, since in many cases it shows better convergence behaviour of...
This paper presents a methodology for steady-state and transient analysis in electrical networks, the methodology is applied to reactive power compensation using thyristor-controlled reactor with fixed capacitor (TCR-FC). The method is based on the use of dynamic harmonic domain (DHD) and associated discrete circuit models. The dynamic harmonic domain is a natural approach for conducting dynamic and...
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