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The aim of this paper is the design and implementation of the control algorithm of a PWM boost rectifier capable to handle bidirectional energy flow. For this goal, the boost rectifier control loops must be tuned for the proper operation of absorbing active power from the power grid and transfer it to the dc load at constant output voltage, and also to give the rectifier the ability to generate back...
This paper is focused on the performance and limits of the boost rectifiers with unity power factor, in terms of the total harmonic distortion factor of the current drawn from the power supply. Different values of the prescribed output voltage are taken into consideration. The direct current control based on the output of voltage controller is proposed. The case study of a battery charging station,...
The aim of this paper is the implementation of the control algorithm of an active DC traction substation using the dSpace DS1103 DSP control board. The adopted current control method is the indirect current control, which assumes that the current regulator controls the power grid current instead of the active filter output current. The active character of the traction substation is given, on one hand,...
Main objective of this paper is to provide a practical tool for the analysis and study of power quality and deforming regime. The LabVIEW graphical programming environment is used for designing virtual instrument to achieve the main two objectives. First goal is synthesizing a distorted signal by adding a number of sinusoidal harmonics which composing it. An accurate voltage signal and the current...
The paper focuses on the design and implementation of the control algorithm for the experimental model of an active DC traction substation, paying particular attention to the design flaws and DSP implementation unforeseen problems. The design flaws combined with unforeseen behavior of the DSP control board can lead to system faults like short-circuits or overvoltage and can produce destructive malfunctions...
The paper presents the energetic performances of a system used for drying of current transformer from 110 kV Ciungetu power station. In fact, the drying process is based on an induction heating system that contains a half-controlled rectifier and a voltage source inverter that operates with resonant load. Two frequencies are taken into consideration for the inverter control. The former is the resonance...
The aim of this paper is the study and implementation of the start-up process of a shunt active compensators. This process is divided in two steps: the passive charging of the compensating capacitor accomplished by the inverse diodes of the compensator power inverter and the active charging of the capacitor, using the IGBTs. The second step can be implemented in many ways, with different ratios of...
The main objective of this paper is to solve a practical and current problem, by taking advantage of the virtual instrumentation in testing electrical machines. The abilities of virtual instrumentation are used to data acquisition, measurement and analyze the values of no-load testing's parameters for three-phase induction motor. The virtual measurement system bench is designed and consist from two...
The synchronous fundamental dq frame is a time domain method derived from the space vector transformations of three phase systems. While these methods had been extensively used for the analysis of three phase circuits this particular method is suitable for the active filtering. This is because it obtains the non-sinusoidal current fundamental which can be used for the compensating current computation...
This paper is concerned with the practical implementation of some orthogonal reference frame based methods in the control of a shunt three-phase three wire active power line conditioner in order to compensate unbalanced nonlinear loads under nonideal voltage conditions. The first two developments are based on the components of voltage and current space vectors in the orthogonal stationary reference...
This paper analyzes the current decomposition, in three-phase, three-wire systems, based on the Conservative Power Theory (CPT), and the application of these components in the active filtering. The CPT current decomposition gives the active component of the current, the reactive component, which can be compensated or not and the void current. It does not give the asymmetry current component, separately...
This paper analyses the energetic performances of an induction heating system for a pipe rolling machine, based on a single-phase current inverter. The study was based both on the real system experimental measurements, as well as on the equivalent Simulink model of the system. The obtained simulation results performed on the measured experimental conditions confirmed the validity of the virtual system...
1Taking into account the equivalent circuit of the induction motor considering the iron losses, its mathematical model was created based on the state equations in the stationary d-q frame, assuming that the magnetizing dynamic inductance is equal to the static one, which depends on the magnetizing current. After obtaining the state equations, containing the d-q stator and rotor current components,...
The energetical analysis of the drive system had been performed by means of an experimental platform and on it's corresponding SIMULINK model for different static operation points. It was considered feeding the asynchronous motor from an indirect voltage source static converter in voltage source with sinusoidal modulation as command strategy.
The electric drive is a main component of industrial equipment designed for small or large complexity, because the achievement of finished goods implies the adjustable mechanical energy available at the output of the system. Among the electric machines available on the market, the induction machine is widespread used because of its simplicity and light sustenance. Because the static converters are...
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