scholarly journals Angular characteristic of a synchronous generator operating over a long line in the dead time of single-phase auto-reclosing

2019 ◽  
pp. 141-153
Author(s):  
Tatiana Krasil’nikova ◽  
◽  
German Samorodov ◽  
Keyword(s):  
Single Phase ◽  
Dead Time ◽  
Synchronous Generator ◽  
Angular Characteristic ◽  
Long Line ◽  
The Dead

scholarly journals Model Predictive Current Control with Fixed Switching Frequency and Dead-Time Compensation for Single-Phase PWM Rectifier

Electronics ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 426 ◽  
Author(s):  
Longyun Kang ◽  
Jianbin Zhang ◽  
Hailan Zhou ◽  
Zixian Zhao ◽  
Xinwei Duan
Keyword(s):  
Single Phase ◽  
Dead Time ◽  
Prediction Equation ◽  
Current Control ◽  
Switching Frequency ◽  
Pwm Rectifier ◽  
Action Time ◽  
Optimal Action ◽  
The Dead ◽  
Dead Time Compensation

The research object of this paper is single-phase PWM rectifier, the purpose is to reduce the total harmonic distortion (THD) of the grid-side current. A model predictive current control (MPCC) with fixed switching frequency and dead-time compensation is proposed. First, a combination of an effective vector and two zero vectors is used to fix the switching frequency, and a current prediction equation based on the effective vector’s optimal action time is derived. The optimal action time is resolved from the cost function. Furthermore, in order to perfect the established prediction model and suppress the current waveform distortion as a consequence of the dead-time effect, the dead-time’s influence on the switching vector’s action time is analyzed, and the current prediction equation is revised. According to the experimental results, the conclusion is that, firstly, compared with finite-control-set model predictive control, proportional-integral-based instantaneous current control (PI-ICC) scheme and model predictive direct power control (MP-DPC), the proposed MPCC has the lowest current THD. In addition, the proposed MPCC has a shorter execution time than MP-DPC and has fewer adjusted parameters than PI-ICC. In addition, the dead-time compensation scheme successfully suppresses the zero-current clamping effects, and reduce the current THD.

Virtual Synchronous Generator Control for Single-Phase Three-Wire Systems

2017 ◽  
Vol 137 (6) ◽  
pp. 546-552 ◽  
Author(s):  
Yuko Hirase ◽  
Osamu Noro ◽  
Shogo Katsura ◽  
Kensho Abe ◽  
Eiji Yoshimura ◽  
...  
Keyword(s):  
Single Phase ◽  
Synchronous Generator ◽  
Virtual Synchronous Generator

scholarly journals Dead-Time Correction Applied for Extended Flux-Based Sensorless Control of Assisted PMSMs in Electric Vehicles

Electronics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 220
Author(s):  
Cheng Lin ◽  
Jilei Xing ◽  
Xingming Zhuang
Keyword(s):  
Control System ◽  
Electric Vehicles ◽  
Dead Time ◽  
Sensorless Control ◽  
Correction Method ◽  
Time Effect ◽  
Dead Time Correction ◽  
Speed Range ◽  
Time Correction ◽  
The Dead

Sensorless control technology of PMSMs is of great importance for safety and reliability in electric vehicles. Among all existing methods, only the extended flux-based method has great performance over all speed range. However, the accuracy and reliability of the extended flux rotor position observer are greatly affected by the dead-time effect. In this paper, the extended flux-based observer is adopted to develop a sensorless control system. The influence of dead-time effect on the observer is analyzed and a dead-time correction method is specially designed to guarantee the reliability of the whole control system. A comparison of estimation precision among the extended flux-based method, the electromotive force (EMF)-based method and the high frequency signal injection method is given by simulations. The performance of the proposed sensorless control system is verified by experiments. The experimental results show that the proposed extended flux-based sensorless control system with dead-time correction has satisfactory performance over full speed range in both loaded and non-loaded situations. The estimation error of rotor speed is within 4% in all working conditions. The dead-time correction method improves the reliability of the control system effectively.

scholarly journals Adopting pade approximation for first order plus dead time models for blending process

2018 ◽  
Vol 7 (4) ◽  
pp. 2800
Author(s):  
Avani Kirit Mehta ◽  
R. Swarnalatha
Keyword(s):  
Dead Time ◽  
Padé Approximation ◽  
Continuous Process ◽  
Process Variable ◽  
Pade Approximation ◽  
Process Systems ◽  
First Order ◽  
Blending Process ◽  
The Dead ◽  
Control Feedback

Dead-time is common to real time processes and occurs when the process variable doesn’t acknowledge to any changes in the set point. Existence of dead time in the systems poses a challenge to control and stabilize, especially in a control feedback loop. Padé approximation provides a determinate approximation of the dead time in the continuous process systems, which can be utilized in the further simulations of equivalent First Order plus Dead Time Models. However, the standard Padé approximation with the same numerator- denominator derivative power, exhibits a jolt at time t=0. This gives an inaccurate approximation of the dead time. To avoid this phenomenon, increasing orders of Padé approximation is applied. In the following manuscript, equivalent First Order plus Dead-Time models of two blending systems of orders four and seven are analysed for the same. As the orders of the Padé approximation increases, the accuracy of the response also increases. The oscillations are increased on a much smaller scale rather than having one big dip in the negative region (as observed in the first few orders of Padé approximation), and the approximation tries to synchronize with the desired response curve in the positive region. All the simulations are done in MATLAB.  

scholarly journals A Modified LUO Converter for Hybrid Energy System FED Grid Tied Inverter

2019 ◽  
Vol 9 (1) ◽  
pp. 1515-1521
Keyword(s):  
Single Phase ◽  
Reference Frames ◽  
Synchronous Generator ◽  
Energy System ◽  
Hybrid Energy System ◽  
Hybrid Energy ◽  
Converter Topologies ◽  
Hybrid Grid ◽  
Grid Connected Inverter ◽  
Inverter Topology

A novel topology of a hybrid grid connected topology based on photo voltaic system and permanent magnet synchronous generator is proposed in this paper. In this grid connected inverter topology the source are connected to the grid with the help of multi input modified LUO converter followed by a single phase three level inverter. Thus compared to the conventional schemes the proposed topology is modeled with the help of reference frames includes direct axis and quadrature axis elements. The modified LUO converter inherits the advantages compared to other DC-DC to converter topologies. The fuzzy logic based MPPT algorithm shows excellent performance under various testing conditions. The PWM generators are used to trigger the inverter and LUO converter. Steady state and transient response of the controllers are discussed and implement the excellent operation of the hybrid energy system. The grid current synchronization is achieved by using PI controller also it will reduce the THD and satisfies the IEEE harmonics standard.

scholarly journals The effect of column and temperature variation on the determination of the dead time in gas chromatographic systems using indirect methods

Heliyon ◽  
2020 ◽  
Vol 6 (2) ◽  
pp. e03302
Author(s):  
Rinaldi Idroes ◽  
Muslem ◽  
Mahmudi ◽  
Saiful ◽  
Ghazi Mauer Idroes ◽  
...  
Keyword(s):  
Temperature Variation ◽  
Dead Time ◽  
Indirect Methods ◽  
The Dead
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