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In this paper, a novel hybrid DTC scheme is proposed for asymmetric six-phase PMSM drives, which can achieve faster dynamic response of classical ST-DTC scheme and good steady-state performance of classical SVM-DTC scheme. The key is that a completely novel control strategy for torque and stator flux is designed. Different torque control methods are adopted under dynamic mode and steady-state mode...
Inverters are widely applied in industrial fields. To acquire the analytical solution of sinusoidal pulse width modulation (SPWM) Single-phase inverters, a traditional harmonic balance based method is extended, in which the double Fourier transform is used to describe the nonlinear switching function of the converter. Thus the steady-state periodic solution of the inverter can be obtained by our approach...
The concept and technologies of fractional calculus have been increasingly applied to model and design circuits and electrical elements. In this work, by combining the principle of harmonic balance and equivalent small parameter method, we develop a new method of steady-state analysis for fractional-order DC-DC converters in discontinuous conduction mode (DCM). The effectiveness of the proposed scheme...
This paper proposes a control method for torque response improvement in permanent magnet synchronous motors. In general, the torque response can be improved by using the inverter overmodulation range. However, in the overmodulation range, the performance of the auto current regulator (ACR) deteriorates significantly because disturbance components, which consist of low-order components, are fed back...
The presented article deals with various issues related to ‘Power Quality (PQ) problems’. One of the reason to get these kind of PQ issues were mainly due to intermittent power generation due to Distributed Energy Resources (DER). However, problem may also occurs in non linearites originated from power system, subsequently can often damage the system. All these issues can be addressed with the power...
In two-level PWM rectifiers, two common control strategies are respectively VOC (Voltage Oriented Control) and DPC (Direct Power Control). In high power applications, the converter performance may suffer seriously from the non-ideal characteristics of the sampling and control system. The effects of the non-ideal characteristics will be analyzed in this paper for classic VOC, DPC and PDPC (Predictive...
Low frequency switching of voltage source inverters generates low order harmonic voltages in the output causing torque and speed ripple. In this paper, a multilevel space vector diagram formed by nine-concentric octadecagons (polygons with 18 sides) using a single DC source is presented which eliminates lower order harmonics till seventeenth order from the phase voltage output over the entire modulation...
Thispaper represents solar photovoltaic (PV) array fed to cascaded H-bridge seven level converter system where maximum power point tracking (MPPT) is achieved bythe perturb and observe (P&O) control algorithm. To realize good feasibility and utilization of PV modules and to maximize the solar energy extraction, the viable control and modulation are instigated. Here, the control is realized using...
This paper shows solar photovoltaic (PV) array fed to cascaded H-bridge nine level converter system where maximum power point tracking (MPPT) is achieved by the incremental conductance (INC) control algorithm. To have appropriate solution and utilization of PV modules and to maximize the solar energy extraction, the viable control and modulation are instigated. Here, the control is realized using...
Differential-mode Ćuk inverter (DMCI) represents a class of single-stage inverter with low device count, modular symmetry, and topological simplicity. Recently, discontinuous modulation scheme (DMS) has been proposed for the DMCI. This paper extends the modular nature of the power stage to the control architecture and proposes a transformation-based tracking controller using adaptive control algorithm...
A new method of steady-state analysis for non-integer order DC/DC converters operating in continuous-conduction-mode (CCM) is put forward. First, the periodic and time-variant non-integer order DC/DC converter system is modeled by a nonlinear vector differential equation. Then by combining the principle of harmonic balance and equivalent small parameter method, the vector differential equation is...
In this work, a Model Predictive Control (MPC) strategy that combines Finite-Control-Set MPC (FCS-MPC) with Selective Harmonic Elimination (SHE) modulation pattern in its formulation is proposed to govern power converters. The key idea here is to define a desired steady-state in terms of the converter current and voltage. To do this, based on the converter current (system state) reference, an associated...
Recently, the operation of a new class of three-phase differential-mode inverter have been proposed and their efficacy demonstrated using a discontinuous-modulation-scheme (DMS) based differential-mode Ćuk inverter (DMCI). DMS-based DMCI has a completely-modular topological configuration. To extend this modularity of the power stage to control implementation, one has to deal with the nonlinearity...
Tow Level- and Three Level- Voltage Source Converters are widely distributed in Medium Voltage Drives for traction and industry. Usually these converters are operated at low switching frequencies to maximize the converter power. To improve the quality of the output voltages and currents optimized pulse patterns are often applied in these applications. In recent publications a closed loop-control including...
The increasing number of renewable energy sources at the distribution grid is becoming a major issue for utility companies, since the grid connected converters are operating at different operating points due to the probabilistic characteristics of renewable energy. Besides, typically, the harmonics and impedance from other renewable energy sources are not taken carefully into account in the installation...
Power electronics converters represent an interesting class of switched systems. They can be assumed to consist of linear elements, external sources, and electronic devices such as diodes and electronic switches. The behavior of the converter is obtained by the commutations of the electronic devices which determine the switchings among the different converter modes. In general it is difficult to know...
Applying the selective harmonic elimination (SHE) technique to grid connected cascaded modular multilevel inverters has been widely discussed in literature. However, due to the difficulties of solving high-order non-linear transcendental equations, the SHE technique cannot be implemented in real time so its applications are limited. This paper presents a technique to convert the non-linear equations...
This paper proposes a new control method based on a source-current detection method suitable for active power filters with a high-order switching ripple filter. The proposed active power filter detects the converter current and the source current, and compensates the source harmonic current by using repetitive control as a conventional source-current detection method. In addition, it estimates and...
Proliferation of non-linear loads resulted in the problems of harmonics, unbalancing, poor power factor. To overcome this active power line conditioner (APLC) is used. In this paper, an artificial neural network (ANN) based controller for active power line conditioner is presented, in which feedforward neural network, trained by levenberg marquardt (LM) algorithm is implemented for generating reference...
This paper presents the steady-state analysis of series resonant converter (SRC) using the extended describing function (EDF) method. The EDF method is used to express non-linear terms of switching waveforms as linear descriptors to develop a linear model of the converter. The converter under consideration consists of a half-bridge inverter and a full-wave rectifier. The steady-state analysis in the...
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