Synchronization control between discrete uncertain networks with different topologies

2020 ◽  
Vol 21 (7-8) ◽  
pp. 789-795
Author(s):  
Ling Lü ◽  
Cunming Zou ◽  
Fuli Zhang
Keyword(s):  
Lyapunov Function ◽  
Parameter Identification ◽  
Closed Loop ◽  
Open Loop ◽  
Synchronization Control ◽  
Uncertain Parameters ◽  
Outer Synchronization ◽  
Response Network ◽  
Simulation Results ◽  
Uncertain Networks

AbstractBased on open-loop–closed-loop technology, we researched the outer synchronization between discrete uncertain networks with different topologies. In order to make the drive and response networks realize the synchronization, a special Lyapunov function is constructed and the open-loop–closed-loop controller is designed. At the same time, we designed an effective parameter identification law to accurately identify the uncertain parameters in the response network. The simulation results show that the synchronization strategy is simple and practical.

Modeling and Simulation of Closed Loop Controlled Parallel Cascaded Buck Boost Converter Inverter Based Solar System

2015 ◽  
Vol 6 (3) ◽  
pp. 648 ◽  
Author(s):  
T. Sundar ◽  
S. Sankar
Keyword(s):  
Solar System ◽  
Modeling And Simulation ◽  
Single Phase ◽  
Closed Loop ◽  
Boost Converter ◽  
Open Loop ◽  
Boost Converters ◽  
Closed Loop Systems ◽  
Simulink Model ◽  
Simulation Results

<p>This Work deals with design, modeling and simulation of parallel cascaded buck boost converter inverter based closed loop controlled solar system. Two buck boost converters are cascaded in parallel to reduce the ripple in DC output. The DC from the solar cell is stepped up using boost converter. The output of the boost converter is converted to 50Hz AC using single phase full bridge inverter. The simulation results of open loop and closed loop systems are compared. This paper has presented a simulink model for closed loop controlled solar system.  Parallel cascaded buck boost converter is proposed for solar system.</p>

Analysis of the Idling Start of the Moving Coil Linear Compressor

2008 ◽  
Author(s):  
Yingbai Xie ◽  
Xiuzhi Huang ◽  
Liyong Lun ◽  
Ganglei Sun
Keyword(s):  
Closed Loop ◽  
Transfer Functions ◽  
Load Condition ◽  
Open Loop ◽  
Reciprocating Compressor ◽  
Piston Motion ◽  
Linear Compressor ◽  
Simulation Results ◽  
The Stability ◽  
Stability Time

The linear compressor is driven by a linear motor. Because it has no crankcase, the piston motion and its control of the linear compressor are differing from that of the conventional reciprocating compressor. For a moving coil linear compressor, mechanical and electromagnetism system are modeled. The open loop and closed loop transfer functions of the system in no-load condition are obtained derived from these equations. The Matlab software is applied to analyze the stability, time domain and frequency domain of the system. Simulation results show that the linear compressor is stable, but the overshoot is relative high, which must be adjusted. This conclusion will be benefit for the design of the idling start of the moving coil linear compressor.

DC/AC Converter Based on Buck Regulator

2013 ◽  
Vol 392 ◽  
pp. 435-438
Author(s):  
Rong Chen ◽  
Jia Sheng Zhang
Keyword(s):  
Closed Loop ◽  
Control Method ◽  
Open Loop ◽  
Control Effect ◽  
Integral Control ◽  
Line Frequency ◽  
Working Principle ◽  
Simulation Results ◽  
Proportional Integral Control ◽  
Differential Control

The introduction of DC/AC converter based on buck regulator is firstly shown, and the analysis of the converters working principle is taken. The control method applied for DC/AC converter based on buck regulator is studied also. The control effect of the open-loop proportional-differential control and closed-loop proportional-integral control are compared by using PSIM software. The parameters adopted in the realistic simulation, waveforms such as voltage of modulation reference and load were given. The simulation results proved that adopting the DC/AC converter could achieve a good performance and can gain a line frequency as 50Hz and the correctness of theoretical analysis.

Estimation of the Order and Parameters of a Fractional Order Model From a Noisy Step Response Data1

2014 ◽  
Vol 136 (3) ◽  
Author(s):  
Mahsan Tavakoli-Kakhki ◽  
Mohammad Saleh Tavazoei
Keyword(s):  
Numerical Simulation ◽  
Fractional Order ◽  
Closed Loop ◽  
Open Loop ◽  
Measurement Noise ◽  
Step Response ◽  
Order Model ◽  
Response Data ◽  
Fractional Order Model ◽  
Simulation Results

This paper deals with integral based methods to estimate the order and parameters of simple fractional order models from the extracted noisy step response data of a process. This data can be obtained from both open-loop and closed-loop tests. Numerical simulation results are presented to verify the robustness of these proposed methods in the presence of the measurement noise.

Modeling and Experimental Verification of Casted Heat Exchanger in Non-Icing and Icing Conditions in Winter

2011 ◽  
Vol 280 ◽  
pp. 232-237 ◽  
Author(s):  
Yu Jie ◽  
Shi Jun You ◽  
Xue Jing Zheng
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Closed Loop ◽  
High Efficiency ◽  
Heat Transfer Process ◽  
Coastal Areas ◽  
Open Loop ◽  
Environmental Friendliness ◽  
Temperature Distributions ◽  
Simulation Results

A large number of seawater-source heat pump systems (SWHP) have been used in residential and commercial buildings in coastal areas due to the attractive advantages of high efficiency and environmental friendliness. To overcome the disadvantages of the open loop SWHP in winter of cold regions, a closed loop SWHP system with casted heat exchanger (CHE) is presented in this paper. The CHE is consisted of pipes immersed in the seawater and used for transferring heat between the seawater and the heat exchanger pipes of the SWHP. In addition, two mathematical models that described heat transfer process of CHE in the icing and non-icing conditions in winter have been developed and validated by an experimental study. The temperature distributions along the CHE were compared between the experimental data and numerical simulation results. The relative error is less than 5%. As a result, application of SWHP systems with CHE in coastal areas in China is feasible due to the favorable geographical conditions and environment.

New topologies of high gain-step-up dc-dc power converters for renewable energy applications

2020 ◽  
Author(s):  
◽  
Mamdouh L. Alghaythi
Keyword(s):  
High Voltage ◽  
Closed Loop ◽  
Low Voltage ◽  
Open Loop ◽  
Loop System ◽  
Input Current ◽  
Voltage Gain ◽  
Voltage Multiplier ◽  
Coupled Inductors ◽  
Simulation Results

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] This dissertation proposes new topologies of high step-up dc-dc power electronic converters for integration renewable energy systems, such as photovoltaic panels (PV) from low voltage sources to high voltage dc buses in 480/900. The first topology presents a high step-up interleaved dc-dc converter with voltage multiplier cells and coupled inductors. The proposed converter achieves a very high step-up voltage gain due to the two coupled inductors and the voltage multiplier cell. This topology utilizes the interleaved boost converter in the input side, and the input current is shared with low ripple. Moreover, the voltage multiplier cell with the secondary windings of the coupled inductors is employed in the output side to achieve the interleaved energy storage. The voltage stress on the semiconductors switches and the passive components is significantly reduced and lower than the output voltage. The aforementioned converter can be operated without an extreme duty cycle or a high turns ratio. The operation principle of the proposed converter and the comparison between the proposed converter with other topologies are discussed. The parameters selection, and simulation results are thoroughly introduced. A 32 V to 800 V-dc is verified and simulated by using PLECS. The second topology introduces a new high voltage gain interleaved DC-DC Converter with diodes-capacitors technique and dual coupled inductors to lift a 30 V to 900 V. The input current ripple is reduced due to the interleaved dc-dc converter operation, the voltage loss on power semiconductor devices is mitigated. Furthermore, by implementing low-voltage-rated MOSFETs with a small ON-resistance, the conduction losses can be reduced, and the efficiency can be improved. The reverse recovery problem of the diodes is mitigated, and the leakage energy is recycled. The simulation results are explored. The other two proposed converters present a multiphase-interleaved boost high step-up dc-dc converter and a high voltage gain converter with an improved charge pump. Both the proposed converters offer a continuous input current, and they both operate in the continuous conduction mode. The voltage stress, the current stress and the losses on power devices are reduced with providing an ultra-voltage gain. The theoretical analysis of the aforementioned converters are analyzed with supporting simulation. The control techniques of high step-up dc-dc converters, which include the maximum power point tracking for PV applications, voltage mode control, PWM and the closed loop control response are provided. The control strategy for the dynamic performance of the aforementioned converter is presented thoroughly. The pulse width modulation (PWM) is generated by the digital signal processor (DSP) Texas Instrument TMS320F28234ZJZ. The method for designing a closed loop system includes choosing the type of control (voltage mode or current mode), generating a small signal model of the power converter, regulating the control to output transfer function of the open loop system, constructing the bode plots of the open loop system, designing voltage compensator transfer function with closed loop bode plots, and providing the simulation results.

scholarly journals Fuzzy Logic Controlled Current Source- Quasi ZSI Fed IM

2019 ◽  
Vol 9 (1) ◽  
pp. 678-683
Keyword(s):  
Fuzzy Logic ◽  
Dynamic Response ◽  
Closed Loop ◽  
Current Source ◽  
Input Voltage ◽  
Open Loop ◽  
Controlled System ◽  
Closed Loop Systems ◽  
Damping Characteristics ◽  
Simulation Results

Quasi ZSI are used for induction motors operating at low input voltage. This work deals with comparison of FLC & PI controlled current fed quasi ZSI fed IMdrive systems. Open loop and closed loop systems are simulated by considering step change in load. The results of open loop and closed loop systems are compared. The objective of this work is to improve the dynamic response of CFQZSI using FLC. The time responses of PI and FLC controlled closed loop systems are also compared. Fuzzy logic controlled system is proposed to improve the dynamic response of CFQZSI fed induction drive system. Design and simulation results are presented to demonstrate the new features. FLC is observed to provide better control the another controllers and it also has improved damping characteristics. The hardware is fabricated and the experimental results are compared with the simulation results.

scholarly journals Backstepping Control Using Barrier Lyapunov Function for Dynamic Positioning Control System with Passive Observer

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Guoqing Xia ◽  
Jingjing Xue ◽  
Chuang Sun ◽  
Bo Zhao
Keyword(s):  
Lyapunov Function ◽  
Closed Loop ◽  
Control Law ◽  
Dynamic Positioning ◽  
Backstepping Technique ◽  
Closed Loop System ◽  
Positioning Control ◽  
Barrier Lyapunov Function ◽  
Backstepping Controller ◽  
Simulation Results

This paper presents a backstepping controller using barrier Lyapunov function (BLF) for dynamic positioning (DP) system. For safety reasons, the position and heading of DP ship are to be maintained in certain range. Thus, in this paper, a control law based on BLF and backstepping technique is proposed to limit the position and heading. The closed-loop system is proved stable in the sense of Lyapunov stability theories. In addition, since the velocities of ship are not measurable and the wave frequency (WF) motion is unavailable, a passive observer is adopted to estimate the velocities and the effect of WF motion. The simulation results show that the proposed controller can limit the position and heading of the vessel in a predefined range and verify the performance of the proposed controller and the passive observer.

On closed-loop equilibrium strategies for mean-field stochastic linear quadratic problems

2020 ◽  
Vol 26 ◽  
pp. 41
Author(s):  
Tianxiao Wang
Keyword(s):  
Optimal Control ◽  
Closed Loop ◽  
Optimal Control Problems ◽  
Mean Field ◽  
Open Loop ◽  
Time Inconsistency ◽  
Control Problems ◽  
Linear Quadratic ◽  
Linear Quadratic Optimal Control ◽  
Equilibrium Strategies

This article is concerned with linear quadratic optimal control problems of mean-field stochastic differential equations (MF-SDE) with deterministic coefficients. To treat the time inconsistency of the optimal control problems, linear closed-loop equilibrium strategies are introduced and characterized by variational approach. Our developed methodology drops the delicate convergence procedures in Yong [Trans. Amer. Math. Soc. 369 (2017) 5467–5523]. When the MF-SDE reduces to SDE, our Riccati system coincides with the analogue in Yong [Trans. Amer. Math. Soc. 369 (2017) 5467–5523]. However, these two systems are in general different from each other due to the conditional mean-field terms in the MF-SDE. Eventually, the comparisons with pre-committed optimal strategies, open-loop equilibrium strategies are given in details.

Comparison of Dc-Dc SEPIC, CUK and Flyback Converters Based LED Drivers

2020 ◽  
pp. 99-107
Author(s):  
Erdal Sehirli
Keyword(s):  
Integrated Circuit ◽  
Closed Loop ◽  
Input Voltage ◽  
Open Loop ◽  
Current Sensor ◽  
Switching Frequency ◽  
Led Driver ◽  
Advantages And Disadvantages ◽  
Led Drivers ◽  
Conduction Mode

This paper presents the comparison of LED driver topologies that include SEPIC, CUK and FLYBACK DC-DC converters. Both topologies are designed for 8W power and operated in discontinuous conduction mode (DCM) with 88 kHz switching frequency. Furthermore, inductors of SEPIC and CUK converters are wounded as coupled. Applications are realized by using SG3524 integrated circuit for open loop and PIC16F877 microcontroller for closed loop. Besides, ACS712 current sensor used to limit maximum LED current for closed loop applications. Finally, SEPIC, CUK and FLYBACK DC-DC LED drivers are compared with respect to LED current, LED voltage, input voltage and current. Also, advantages and disadvantages of all topologies are concluded.

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