Performance of an acoustic Doppler current estimation method based on the Symmiktos method

2002 ◽  
Author(s):  
H.L.G. Lago ◽  
P.F.B. Eriksson ◽  
M. Asman
Keyword(s):  
Estimation Method ◽  
Current Estimation

Proportional Integral Estimator of the Stator Resistance for Direct Torque Control Induction Motor Drive

2017 ◽  
Vol 8 (4) ◽  
pp. 1631
Author(s):  
Jagdish Gangadharrao Chaudhari ◽  
Sanjay Bhauraoji Bodkhe ◽  
Mohan V. Aware
Keyword(s):  
Induction Motor ◽  
Estimation Error ◽  
Direct Torque Control ◽  
Estimation Method ◽  
Operating Conditions ◽  
Torque Control ◽  
Proportional Integral ◽  
Stator Current ◽  
Current Estimation ◽  
Stator Resistance

In this paper, an improved proportional integral stator resistance estimation for a direct torque controlled induction motor is proposed. This estimation method is based on an on-line stator resistance correction regarding the variations of the stator current estimation error. In fact, the input variable of the PI estimator is the stator current estimation error. The main idea is to tune accurately the stator resistance value relatively to the evolution of the stator current estimation error gradient to avoid the drive instability and ensure the tracking of the actual value of the stator resistance. But there is an unavoidable steady state error between the filtered stator current modulus and its estimated value from the dq model of the machine which is due to pseudo random commutations of the inverter switches. An offset has been introduced in order to overcome this problem, for different speed command values and load torques. Simulation results show that the proposed estimator was able to successfully track the actual value of the stator resistance for different operating conditions

Inductor Current Estimation Method for Three-phase Interleaved Bidirectional Buck-Boost Converters using a Current Sensor on a DC Bus

2019 ◽  
Vol 139 (5) ◽  
pp. 459-465
Author(s):  
Kengo Kakomura ◽  
Nobukazu Hoshi ◽  
Kousuke Uchida ◽  
Kazunari Akiyama ◽  
Hisashi Higuchi
Keyword(s):  
Estimation Method ◽  
Current Sensor ◽  
Boost Converters ◽  
Current Estimation ◽  
Three Phase ◽  
Dc Bus ◽  
A Current

The Effect of Specific Vomitory Width in Stadiums on Evacuation Efficiency Based on Virtual Crowd Simulation

2014 ◽  
Vol 584-586 ◽  
pp. 243-246
Author(s):  
Ying Liu ◽  
Zheng Zheng Tang ◽  
Hong Peng Xu
Keyword(s):  
Estimation Method ◽  
Crowd Simulation ◽  
Building Codes ◽  
Circulation System ◽  
Agent Based Model ◽  
Minimum Width ◽  
Agent Based ◽  
Current Estimation ◽  
Way Finding

Stadium vomitory width plays a very important role in the evacuation process of large number of spectators. The current estimation method of vomitory minimum width in China building codes often brings architects misunderstanding in the egress design and evacuation performance of stadiums. Therefore, this paper investigates the composition of spectator crowds in different events hosted in stadiums, their movement capability and way-finding behaviors, build a typical unit of terraced stand based on the parameters given by building codes, use agent-based model STEPS to simulate and analyze the effect of vomitory width on stadium evacuation efficiency. The simulated results show that the vomitory width affects stadium evacuation efficiency very differently. Architects should organize the circulation system reasonably and provide guidance for spectator crowds while designing the stadiums, not blindly increase the vomitory.

scholarly journals Control Strategy Research of Based on Resonance Feedforward and Current Estimate of the Photovoltaic Grid Inverter

2021 ◽  
Vol 2136 (1) ◽  
pp. 012030
Author(s):  
Shengqing Li ◽  
Yu Jiang ◽  
Zhaoxu Luo
Keyword(s):  
Control Strategy ◽  
Feedforward Control ◽  
Estimation Method ◽  
Poor Quality ◽  
Current Estimate ◽  
Strategy Research ◽  
Grid Environment ◽  
Suppression Effect ◽  
Current Estimation

Abstract Due to poor quality of grid-connected current and large impedance value of grid are caused in weak grid environment. Therefore, a control strategy combining multiple resonant feedforward and current estimation method is adopted in this paper. Firstly, in order to make the positive feedback channel have the feedback effect only at the main background harmonics, the low-order harmonics of the grid are extracted by using the method of multi-resonance feedforward control. At the same time, under the premise that the suppression effect of LCL natural resonant frequency remains unchanged, the current estimation method is added into the control strategy, so as to reduce the system cost. Finally, the simulation results show that thus verifying the correctness and effectiveness of the control strategy.

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