Control Design for Current Loop of PMSM Using A Modified Model-Compensation ADRC Controller

2020 ◽  
Author(s):  
Yingning Gao ◽  
Hui Zhao ◽  
Kemao Ma ◽  
Xin Huo
Keyword(s):  
Control Design ◽  
Current Loop ◽  
Modified Model

scholarly journals Multiple-Loop Control Design for a Single-Stage PV-Fed Grid-Tied Differential Boost Inverter

2020 ◽  
Vol 10 (14) ◽  
pp. 4808 ◽  
Author(s):  
Abdelali El Aroudi ◽  
Reham Haroun ◽  
Mohamed Al-Numay ◽  
Meng Huang
Keyword(s):  
Power Factor ◽  
Power Factor Correction ◽  
Control Design ◽  
Domain Model ◽  
Single Stage ◽  
Signal Frequency ◽  
Current Loop ◽  
Static Approximation ◽  
Grid Current ◽  
Averaged Model

This paper focuses on the control design of a differential boost inverter when used in single-stage grid-tied PV systems. The inverter performs both Maximum Power Point Tracking (MPPT) at the DC side and Power Factor Correction at the AC side. At first, the state-space time-domain averaged model of the inverter is derived and the small signal frequency domain model is obtained using a quasi-static approximation in which the inverter is treated as a DC–DC converter with a slowly varying output voltage. Then, the controllers are designed using a three-loop strategy in which the inverter inductor currents loop is used for suitable compensation, the DC Photovoltaic (PV) voltage loop is used for MPPT and the output grid current loop is used for Power Factor Correction (PFC) and active power control. The selection of the control parameters is based on a compromise among suitable system performances such as settling time of the input PV voltage, the sampling period of the MPPT, total harmonic distortion of the output grid current, power factor as well as suppression of subharmonic oscillation for all the range of the operating duty cycle. The resulting design ensures that the oscillations of the voltage, current and power at the DC side and the grid current at the AC side are effectively controlled. The validity of the proposed control design is verified by numerical simulations performed on the switched model of the system demonstrating its robustness and fast response under irradiance variations and MPPT perturbations despite the nonlinearity and complexity of the system.

Bifurcation in a Simple Model of the Cardiovascular System

2000 ◽  
Vol 39 (02) ◽  
pp. 118-121 ◽  
Author(s):  
S. Akselrod ◽  
S. Eyal
Keyword(s):  
Nonlinear Dynamics ◽  
Blood Pressure ◽  
Heart Rate ◽  
Fixed Point ◽  
Cardiovascular System ◽  
Modified Model ◽  
Mayer Waves ◽  
Sustained Oscillations ◽  
Human Cardiovascular System ◽  
Physiological Values

Abstract:A simple nonlinear beat-to-beat model of the human cardiovascular system has been studied. The model, introduced by DeBoer et al. was a simplified linearized version. We present a modified model which allows to investigate the nonlinear dynamics of the cardiovascular system. We found that an increase in the -sympathetic gain, via a Hopf bifurcation, leads to sustained oscillations both in heart rate and blood pressure variables at about 0.1 Hz (Mayer waves). Similar oscillations were observed when increasing the -sympathetic gain or decreasing the vagal gain. Further changes of the gains, even beyond reasonable physiological values, did not reveal another bifurcation. The dynamics observed were thus either fixed point or limit cycle. Introducing respiration into the model showed entrainment between the respiration frequency and the Mayer waves.

PENGARUH MODEL PEMBELAJARAN QUANTUM LEARNING BERNUANSA MUSIK KLASIK TERHADAP HASIL BELAJAR IPA KELAS VI DI SDN 58 DAN SDN 82 PEKANBARU

2019 ◽  
Vol 3 (4) ◽  
Author(s):  
Neni Hermita ◽  
Zufriady Zufriady
Keyword(s):  
Control Design ◽  
Quantum Learning

Penelitian ini dilatarbelakangi oleh belum optimalnya hasil belajar IPA kelas VI di SD Pekanbaru, melalui hasil wawancara langsung dengan beberapa siswa kelas VI SD, diketahui bahwa sebagian besar siswa lebih mudah belajar sambil mendengarkan audio dari pada visual, maupun kinestetik. Penelitian ini bertujuan untuk mengetahui: (1) pengaruh model pembelajaran quantum learning bernuansa musik Mozart terhadap hasil belajar IPA kelas VIb SD Negeri 82 Pekanbaru; dan (2) pengaruh model pembelajaran quantum learning bernuansa musik Beathoven terhadap hasil belajar IPA kelas VI SD Negeri 58 Pekanbaru. Penelitian ini adalah penelitian eksperimen dengan desain true-experimental, yaitu posttest only control design. Hasil penelitian menunjukkan bahwa: (1) terdapat pengaruh model pembelajaran quantum learning bernuansa musik Mozart terhadap hasil belajar IPA kelas VIb SD Negeri 82 Pekanbaru. Diketahui dari nilai nilai thitung > nilai ttabel (3,037 > 2,064). Dengan demikian, hipotesis penelitian yang berbunyi diduga terdapat pengaruh model pembelajaran quantum learning bernuansa musik Mozart terhadap hasil belajar IPA kelas VIb SD Negeri 82 Pekanbaru, diterima; dan (2) terdapat pengaruh model pembelajaran quantum learning bernuansa musik Beathoven terhadap hasil belajar IPA kelas VIa SD Negeri 58 Pekanbaru Diketahui dari nilai nilai thitung > nilai ttabel (2,834 > 2,093). Namun, setelah dibandingkan kedua hasil belajar kelompok eksperimen tersebut, diketahui tidak adanya perbedaan, karena thitung < nilai ttabel (0,509 < 2,014). Dengan demikian, hipotesis penelitian yang berbunyi diduga terdapat pengaruh model pembelajaran quantum learning bernuansa musik Beathoven terhadap hasil belajar IPA kelas VIa SD Negeri 58 Pekanbaru, diterima.

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