Harmonic Reduction and Chaotic Operation towards Application of AC/AC Converter with Feedback Control

2019

NOLTA

Self Cite

An application of nonlinear control to enhance the operation of dynamical systems is found in the literature. In particular, recent research achieved harmonics reduction by driving a single-phase AC/AC converter to a chaotic regime. However, the periodic symmetry of the output voltage is broken during this process. This paper proposes two single-phase AC/AC converters with a symmetry-recovery feature that allows the converters to work either in a chaotic or stable regime. The proposed method, which is based on the extended delay feedback control, found a direct impact to recover the symmetry on the distribution of the power density through the time-delayed input.

“…This paper expands the work of [3,6,8]. The goal is to add the functionality of symmetry recovering to a two-phase AC/AC converter configuration.…”

Section: Introductionmentioning

confidence: 92%

“…1. The parameters for both converters are based on the work of [6]. The sources are displaced by 120 • .…”

Section: System Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Symmetry recovery from the viewpoint of power and frequency by extended delay feedback control

Sánchez

2019

NOLTA

Self Cite

“…Consequently, more noise may arise in packet signal during the payload. In order to reduce the possible effect of the noise on the packet dispatching during the payload, we further modulate the payload of the premodulated packet using the DCSK scheme because the chaos-based modulation can spread the spectrum of noise [18,25,26]. Here, it should be stressed that there is no need to recognize the signal in the payload.…”

Section: Figmentioning

confidence: 99%

Power packet dispatching with features on safety

Zhou

Takahashi

2016

NOLTA

Self Cite

This paper investigates and proposes one advantageous function of a power packet dispatching system, which has been proposed by authors' group with being apart from the conventional power distribution system. Here is focused on the feature on safety of power packet dispatching which covers two aspects: information safety (protect the information of packet from attackers) and power safety (keep loads safe regarding supplied power from packet). For the purpose of achieving the information safety and the power safety, we introduce simple modulations of power packets before sending them. In particular, in order to protect the information of packets, partial packet modulation is proposed first, i.e., modulating partial information tags of packets. Modulation scheme based on chaotic signal is one possibility for this purpose and we adopt the differential chaos shift keying (DCSK) scheme in this paper. Next, the power safety can be achieved by applying pulse width modulation (PWM) to the payload of packets. Meanwhile, considering the effect of the noise on the packet dispatching, further modulation of the payload using the DCSK scheme is proposed, which can spread the spectrum of the noise. Consequently, we introduce the concept of whole packet modulation, in which PWM is applied to the payload of packets first, and then modulation using the DCSK scheme is applied throughout the whole packet. In this manner, both the information safety and the power safety can be achieved and the spectrum of noise is spread as well. Additionally, it is worth mentioning that the rigorous examination of the modulation method is not the target in this moment.

The Broken Symmetry of Output Currents in a Matrix Converter and Its Recovery Control

Sánchez

Okuda

2020

J CIRCUIT SYST COMP

Symmetry is not only used to simplify the analysis of three-phase electrical systems, but it is also used to define its voltages, currents and loads. When the loads are symmetrical, the currents of a three-phase AC system are expected to be symmetrical as well. Given the proper conditions, in converters such as the matrix converter (MC), the output voltages and currents are expected to be sinusoidal with periodic symmetry. However, in some cases this symmetry is broken so that, there appears nonlinear behaviors such as quasiperiodicity and so on. Based on simulations and experiments, this paper focuses on an analysis of a quasiperiodic behavior and the presence of a DC component in the output currents of a Venturini modulated MC. The presence of such behaviors in the output currents indicates that the symmetry in a period is broken. The broken symmetries appear when the input and output frequencies are mismatched. In addition, this paper shows the possibility to recover the symmetry of the output currents of the MC. The method for symmetry recovery is based on a time-delayed feedback control. The simulation and experimental results indicate the possibility of attenuating the quasiperiodic behavior and DC component.