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This paper is focused on the presentation of a active filtering and regeneration system (SISFREG) developed for converting the DC traction substations in active substations. SISFREG will be connected between the catenary-line and the primary of the traction transformer, via a dedicated transformer. The main component of SISFREG is a shunt active power filter based on voltage source inverter structure,...
This paper presents an active DC-traction substation with six-pulse uncontrolled rectifier, whose structure and control ensure the braking energy recovery and increased power quality in both traction and regeneration regimes. The key component in the power structure is a voltage source inverter-based shunt active power filter connected properly between the DC-traction line and the power supply. To...
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 paper presents the methodology and design of testing structure dedicated to one laboratory model of a filtering and regeneration system (SISFREG) developed through the project number 42/2014, type Partnerships — PCCA 2013, which allows the conversion of the dc traction substations in "active substations". The configuration was made based on the actual conditions prevailing in a substation...
The active filtering and regeneration systems used in active DC traction substations must allow the natural transition from filtering to regeneration mode and vice versa. In the both operation modes, active filtering and regeneration, the grid current must be sinusoidal. Consequently, the magnitude of the fundamental network current is necessary in the control part, in order to generate the reference...
The theoretical and experimental investigations presented in this paper are related to an LCL filter with damping resistance used to interface the voltage source inverter of an active DC-traction substation with the power supply. The case study of DC-traction system with six-pulse diode rectifier, as is the case of Bucharest subway substations, is taken into consideration. Starting from the configuration...
The objective of the paper is the presentation of a laboratory model of a system for active filtering and regeneration (SISFREG) developed through an applied research collaborative project in the frame of Partnerships in priority area programme during 2014–2016. The system allows the conversion of the DC traction substations into “active substations”. The main component of the laboratory model is...
This paper is focused on the possibilities of implementing an auto-adaptive control, without a phase-locked loop circuit, for the operating frequency in an induction heating system with single-phase voltage source inverter and resonant L-LC load. Based on the phasor diagram of the equivalent resonant load under resonance condition, three possibilities have been identified to express an error to be...
This paper is concerned with the implementation of the Fryze-Buchholz-Depenbrock theory in the control of an active DC-traction substation. The active DC-traction substation taken into consideration is obtained by adding a specific system for active filtering and regeneration to a classical DC-traction substation with twelve-pulse uncontrolled rectifier. The main component is a voltage source inverter-based...
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...
This paper focuses on the analysis of the power quality and energy efficiency in the Bucharest's subway traction substations and finding solutions for their improvement. Two directions are taken into consideration. The former consists in the active filtering of the current and the reactive power compensation, so that the traction substations to operate in conditions of unity power factor. The latter...
This paper is focused on the optimal design of the controllers in an active filtering and regeneration system for DC railway traction substation. The control algorithm of the system is based on the indirect current control method and uses two closed loops with PI controllers: an outer one for the DC voltage control and the other for the grid current control. In order to perform the energy regeneration...
This paper concentrates on the LCL filter with damping resistance intended to connect the shunt active power filter of an active DC-traction substation to the point of common coupling with the transmission grid. In order to find design conditions and conceive a design algorithm, attention is directed to the transfer functions related to currents and the associated frequency response. The mathematical...
This paper is focused on the LCL filter with damping resistance used to interface the shunt active power filter of an active DC-traction substation with the power supply. Two main requirements to be met by the interface filter are emphasized, in terms of significant attenuation of the current switching harmonics and ensuring the unalterated flow of the current to be compensated by active fitering...
In the regeneration and filtering systems used in DC-traction substations, a separating circuit, between the catenary and the voltage source inverter, is necessary. It interacts with the compensating capacitance only in the regeneration mode of the system and affects the quality of the active power transfer resulted in the braking mode. The phenomena that occur are complex because the inverter operates...
This paper focuses on the design and implementation of the control algorithm of an active filtering and energy recovery system which transforms the classical DC traction substation into a active substation. For this goal, the active power filter control loops must be tuned not only for the proper operation as an active filter, but also to give the APF the ability to generate back to the power grid...
This paper is focused on a practical solution to convert a classical DC railway traction substation with unidirectional power flow into a bidirectional substation having the capability of power quality improvement through the active filtering function. The case of 12-pulse parallel rectifier in the traction substation is taken into consideration and the new functions are performed by an IGBT-based...
This paper is concerned with the possibilities of transformation the DC traction substations with uncontrolled rectifiers into active substation, being able to ensure both the braking energy recovery and active filtering function. There are a lot of approaches on the management of regenerative braking energy, most of them based on energy storage systems or the concept of reversible substation. Few...
This paper is focused on the power control system of an induction heating system with single-phase resonant voltage source inverter supplied by a three-phase full controlled bridge rectifier. A matching inductor at the inverter output is taken into consideration to maximize the power transfer to the heated piece. In order to regulate the inverter output current, a Proportional-Integrator-Derivative...
This paper is concerned with the design of the power control system for a single-phase voltage source inverter feeding a parallel resonant induction heating load using shift-phase inverter control. The control of the inverter output current, meaning the active component of the current through the induction coil when the control frequency is equal or slightly exceeds the resonant frequency, is achieved...
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