Mathematical Analysis of the Small Signal Model for Voltage-Source Inverter in SPMSM Drive Systems

2019 ◽  
Author(s):  
Mohamed G. Hussien ◽  
Abd El-Wahab Hassan
Keyword(s):  
Mathematical Analysis ◽  
Voltage Source ◽  
Small Signal ◽  
Voltage Source Inverter ◽  
Signal Model ◽  
Small Signal Model ◽  
Drive Systems

scholarly journals Analysis and Experimental Verification of New Power Flow Control for Grid-Connected Inverter with LCL Filter in Microgrid

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Herong Gu ◽  
Yajuan Guan ◽  
Huaibao Wang ◽  
Baoze Wei ◽  
Xiaoqiang Guo
Keyword(s):  
Flow Control ◽  
Power Flow ◽  
Voltage Source ◽  
Small Signal ◽  
Distributed Energy ◽  
Signal Model ◽  
Power Flow Control ◽  
Small Signal Model ◽  
Grid Connected Inverter ◽  
Good Agreement

Microgrid is an effective way to integrate the distributed energy resources into the utility networks. One of the most important issues is the power flow control of grid-connected voltage-source inverter in microgrid. In this paper, the small-signal model of the power flow control for the grid-connected inverter is established, from which it can be observed that the conventional power flow control may suffer from the poor damping and slow transient response. While the new power flow control can mitigate these problems without affecting the steady-state power flow regulation. Results of continuous-domain simulations in MATLAB and digital control experiments based on a 32-bit fixed-point TMS320F2812 DSP are in good agreement, which verify the small signal model analysis and effectiveness of the proposed method.

Analysis of Coupled Electromechanical Oscillators by a Band-Pass, Reduced Complexity, Volterra Method

2005 ◽  
Author(s):  
Nikolaos I. Xiros ◽  
Ioannis T. Georgiou
Keyword(s):  
Series Representation ◽  
Harmonic Component ◽  
Voltage Source ◽  
Small Signal ◽  
Signal Model ◽  
Small Signal Model ◽  
Low Pass ◽  
Identification Technique ◽  
Volterra Method ◽  
Band Pass

Nonlinear analysis of a typical electromechanical coupled oscillator is approached by using Volterra polynomial series representation for nonlinear systems. The problem is formulated in a band-pass framework, allowing the study of transmission of power and information over the same line from the excitation voltage source to the final electromagnetic transducer stage. An input-output, black-box, monochromatic identification technique is applied, in order to obtain a simple, yet nonlinear, small-signal model for the low-pass modulating envelope of the excitation. The small-signal model consists of a low-order static polynomial nonlinearity intermitted between two linear MA filters. The procedure is carried completely in the frequency domain. The most important of the advantages, offered by the proposed methodology, is that identification is performed by employing only the fundamental harmonic component of the response to single sinusoidal inputs of various frequencies and amplitudes that sweep the band and range of interest.

scholarly journals Limitations of Small-Signal Modeling of Grid-Connected VSCs under Phase Jumps and Frequency Deviations

2020 ◽  
Author(s):  
Hongyang Zhang ◽  
xiongfei wang ◽  
östlund stefan
Keyword(s):  
Voltage Source ◽  
Frequency Variation ◽  
Small Signal ◽  
Voltage Source Converters ◽  
Signal Model ◽  
Small Signal Model ◽  
Frame Transformation ◽  
The Stability ◽  
Small Signal Modeling ◽  
Frequency Variations

The stability of grid-connected voltage source converters (VSCs) is commonly studied by the small-signal model in the synchronous reference (dq) frame. With phase-locked loop dynamic from VSCs, it is inevitable to convert the small-signal model to a common dq frame. When linearizing the frame transformation, the trigonometric functions of the angle are approximated by first-order terms. In this letter, the limitation of such linearization on the dq-transformation is discussed. The accuracy of the model, in presence of phase jumps and frequency variations, are examined. It is found that even under small phase jumps, mismatches are found between the small-signal model (SSM) and a nonlinear model (NM). It is further revealed that during the dynamics of frequency variation, significant mismatches can occur between the SSM and the NM.

scholarly journals Limitations of Small-Signal Modeling of Grid-Connected VSCs under Phase Jumps and Frequency Deviations

2020 ◽  
Author(s):  
Hongyang Zhang ◽  
xiongfei wang ◽  
östlund stefan
Keyword(s):  
Voltage Source ◽  
Frequency Variation ◽  
Small Signal ◽  
Voltage Source Converters ◽  
Signal Model ◽  
Small Signal Model ◽  
Frame Transformation ◽  
The Stability ◽  
Small Signal Modeling ◽  
Frequency Variations

The stability of grid-connected voltage source converters (VSCs) is commonly studied by the small-signal model in the synchronous reference (dq) frame. With phase-locked loop dynamic from VSCs, it is inevitable to convert the small-signal model to a common dq frame. When linearizing the frame transformation, the trigonometric functions of the angle are approximated by first-order terms. In this letter, the limitation of such linearization on the dq-transformation is discussed. The accuracy of the model, in presence of phase jumps and frequency variations, are examined. It is found that even under small phase jumps, mismatches are found between the small-signal model (SSM) and a nonlinear model (NM). It is further revealed that during the dynamics of frequency variation, significant mismatches can occur between the SSM and the NM.

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