A Nonlinear Approach for Assessing Stability in Line-Commutated Converters With an Integrating Controller

Uicich, Gustavo; Maestri, Sebastian; Benedetti, Mario; Carrica, Daniel

doi:10.1109/tpel.2013.2251665

Cited by 4 publications

(1 citation statement)

References 20 publications

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“…G. Uicich et al [8] Closed-loop stability analysis of lineswitched converters (LCCs) is mainly based on modeling the linear transmission of small signals for the power stage. The inaccuracies derived from using these simple frequency domain models have led to conservative compensation strategies with reduced circuit bandwidths.…”

Section: IImentioning

confidence: 99%

Solar System Analysis for Different LOADS in Stand-Alone Mode

Indurkhya¹,

Vishwakarma²

2021

IJOSCIENCE

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Distributed generators using environmentally friendly energy sources such as wind, small water and solar energy have become an important part of the future smart grid/micro grid concept. Design of an autonomous photovoltaic system to study the reaction of solar modules to variable irradiation conditions and their effect on loads. The autonomous system must include a battery storage system to handle non-linear load responses on the AC side. And improve the output power of the photovoltaic system using the MPPT algorithm specially designed to drive linear and non-linear loads on stand-alone systems. And causing the system to respond to varying levels of radiation in the environment and achieve an uninterrupted regulated output of the system. The system examined the behavior of linear and non-linear loads with constant irradiation of 1000 wb / m2 and then modified it to a value between 1000 wb / m2 and 200 wb/m2. The harmonic content in the line voltage increased to 3.34% with a non-linear load by 0.54% with a linear load.

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Section: IImentioning

confidence: 99%

Solar System Analysis for Different LOADS in Stand-Alone Mode

Indurkhya¹,

Vishwakarma²

2021

IJOSCIENCE

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Grid-tie three-phase inverter with active and reactive power flow control capability

Sampaio

Brito

Melo

et al. 2013

2013 Brazilian Power Electronics Conference

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This paper proposes a methodology for the active and reactive power flow control, applied to threephase inverter operating in grid-connected mode at low AC voltage. The converter's control technique is based on Linear Matrix Inequalities -LMI together with Dstability criteria and state-feedback linearization. Through multi-loop control, the power loop uses an adapted active and reactive power transfer expressions, in order to obtain the magnitude voltage and power transfer angle to control the power flow between the distributed generation and the utility/grid. The multiloop control uses the technique of state-feedback linearization in order to minimize the system nonlinearities, improving the controller's performance and mitigating potential system disturbances. Moreover, the purpose of the methodology is to obtain the best controllers with the lowest gains placing the poles in the left-half s-plane region specified during the design stage, resulting fast responses with reduced oscillations. In order to demonstrate the feasibility of the proposed control a 3000VA three-phase prototype was experimentally implemented. Furthermore, experimental results demonstrate anti-islanding detection and protection against over/under voltage and frequency.

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Surge Vibration-Induced Nonlinear Behavior Regulation of Power Amplifier for Magnetic Bearing in a 315 kW Centrifugal Compressor

Zhang

Zheng

Ma³

et al. 2017

Journal of Vibration and Acoustics

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The severe vibration induced by surge and rotating stall is an obstacle to the stability of a magnetically suspended centrifugal compressor (MSCC). In order to suppress the severe vibration caused by surge instability, this paper focuses on compressor surge performance improvements enabled by power amplifier control improvements which result in increased dynamic load capacity (DLC) of the systems axial thrust magnetic bearing. A complete discrete-time model of the active magnetic bearing (AMB) power amplifier, composed of three piecewise linear intervals, is developed. A comprehensive view of the dynamic evolution process from stable state to bifurcation for the power amplifier is also analyzed. In order to stabilize the unstable periodic orbits in the power amplifier, a time-delay feedback control (TDFC) method is introduced to enhance the stability of the power amplifier, while the MSCC is subjected to the surge instability. Simulation results show that the stable region of the power amplifier is extended significantly using the TDFC method. Finally, the experimental investigations performed by an MSCC test rig demonstrate the effectiveness of the proposed solution under the conditions of modified surge and mild surge.

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A Nonlinear Approach for Assessing Stability in Line-Commutated Converters With an Integrating Controller

Cited by 4 publications

References 20 publications

Solar System Analysis for Different LOADS in Stand-Alone Mode

Solar System Analysis for Different LOADS in Stand-Alone Mode

Grid-tie three-phase inverter with active and reactive power flow control capability

Surge Vibration-Induced Nonlinear Behavior Regulation of Power Amplifier for Magnetic Bearing in a 315 kW Centrifugal Compressor

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