Voltage Ripple Reduction Research Articles

Instantaneous value control of current vector of energy transfer circuit with inductor converter bridges between superconducting magnets

AbstractEnergy transfer circuits of inductor converter circuits (ICB), used for power supplies for superconducting magnets, are studied. Analytical solutions of steady‐state characteristics of ICB energy transfer circuits are analyzed. On the basis of these solutions, a discussion is presented regarding a new control method of ICB transfer circuit to reduce a voltage ripple across a load superconducting magnet. This paper will propose a new control for line‐commutated converters of ICB energy transfer circuit for quick changes in a transfer angle and a transfer frequency for the voltage ripple reduction control. Speeding‐up of the proposed controls is also discussed. Validity of the proposed controls is confirmed by computer simulations.

Transient Analysis of an Advanced Static Var Compensator Using Quad-Series Voltage-Source PAM Inverters.

This paper deals with an advanced static var compensator (ASVC) using quad-series voltage-source PAM inverters. The ASVC consists of four three-phase voltage-source inverters with a common dc capacitor and four three-phase transformers, each primary winding of which is connected in series each other. Each inverter outputs a square wave voltage, while the synthesized output voltage of the ASVC has a 24-step wave shape. This results not only in a great reduction of harmonic currents and de voltage ripples but also in less switching and snubbing losses.In this paper, transient analysis is performed with the focus on the response of reactive power and the resonance between the dc capacitor and ac reactors. Experimental results obtained from a small-rated laboratory model of 10kVA are also shown to verify analytical results based on the p-q transformation. The analytical results help us to design system parameters such as the capacity of the dc capacitor and feedback gains.

Voltage Ripple Reduction Control of Energy Transfer Circuit with Inductor Converter Bridges between Superconducting Magnets.

Energy transfer circuits between two superconducting magnets have been proposed, discussed and tested. We have studied on power supplies for superconducting magnets which consists of a small power converter, a superconducting magnet for an energy storage, and an energy transfer circuit of inductor converter bridges (ICB). We derived analytical solutions on the basic characteristics of ICB energy transfer circuits. In this paper, from the analytical solutions, a new control method of ICB trasnsfer circuit to reduce voltage ripples across a load superconducting magnet is proposed and discussed. Availabilities of the proposed control method are confirmed by the computer simulations.

Instantaneous Value Control of Current Vector of Energy Transfer Circuit with Inductor Converter Bridges between Superconducting Magnets.

Energy transfer circuits of inductor converter circuits (ICB), used for power supplies for superconducting magnets, are studied. Analytical solutions of steady-state characteristics of ICB energy transfer circuits are analyzed. On the basis of these solutions, a discussion is presented regarding a new control method of ICB transfer circuit to reduce a voltage ripple across a load superconducting magnet. This paper will propose a new control for line-commutated converters of ICB energy transfer circuit for quick changes in a transfer angle and a transfer frequency for the voltage ripple reduction control. Speeding-up of the proposed controls is also discussed. Validity of the proposed controls is confirmed by computer simulations.