scholarly journals Direct Sliding Mode Control for Dynamic Instabilities in DC-Link Voltage of Standalone Photovoltaic Systems with a Small Capacitor

Electronics ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 133
Author(s):  
Ibrahim Al-Wesabi ◽  
Zhijian Fang ◽  
Zhiguo Wei ◽  
Hanlin Dong
Keyword(s):  
Sliding Mode ◽  
Supply And Demand ◽  
Dynamic Performance ◽  
Real Time Control ◽  
Boost Converters ◽  
Electrolytic Capacitors ◽  
Time Control ◽  
Grid Connection ◽  
Bidirectional Converter ◽  
Power Decoupling

Large electrolytic capacitors used in grid-connected and stand-alone photovoltaic (PV) applications for power decoupling purposes are unreliable because of their short lifetime. Film capacitors can be used instead of electrolytic capacitors if the energy storage requirement of the power conditioning units (PCUs) is reduced, since they offer better reliability and have a longer lifetime. Film capacitors have a lower capacitance than electrolytic capacitors, causing enormous frequency ripples on the DC-link voltage and affecting the standalone photovoltaic system’s dynamic performance. This research provided novel direct sliding mode controllers (DSMCs) for minimizing DC-link capacitor, regulating various components of the PV/BES system that assists to manage the DC-link voltage with a small capacitor. DSMCs were combined with the perturb and observe (P&O) method for DC boost converters to increase the photovoltaic system’s dynamic performance, and regulate the battery’s bidirectional converter (BDC) to overcome the DC-link voltage instabilities caused via a lower DC-link capacitor. The system is intended to power both AC and DC loads in places without grid connection. The system’s functions are divided into four modes, dependent on energy supply and demand, and the battery’s state of charge. The findings illustrate the controllers’ durability and the system’s outstanding performance. The testing was carried out on the MT real-time control platform NI PXIE-1071 utilizing Hardware-In-The-Loop experiments and MATLAB/Simulink.

scholarly journals Fixed-Time Sliding-Mode Fault-Tolerant Control of Waste Heat Power Generator Systems

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Zhi Wang ◽  
Yateng Bai ◽  
Jin Xie ◽  
Zhijie Li ◽  
Caoyuan Ma ◽  
...  
Keyword(s):  
Fault Tolerant ◽  
Waste Heat ◽  
Sliding Mode ◽  
Dynamic Performance ◽  
Tracking Error ◽  
Fixed Time ◽  
Fault Estimation ◽  
Actuator Fault ◽  
Heat Power ◽  
Time Control

In order to overcome disturbances such as the instability of internal parameters or the actuator fault, the time-varying proportional-integral sliding-mode surface is defined for coordinated control of the excitation generator and the steam valve of waste heat power generation units, and a controller based on sliding-mode function is designed which makes the system stable for a limited time and gives it good performance. Based on this, a corresponding fault estimation law is designed for specific faults of systems, and a sliding-mode fault-tolerant controller is constructed based on the fixed-time control theory so that the systems can still operate stably when an actuator fault occurs and have acceptable performance. The simulation results show that the tracking error asymptotically tends to be zero, and the fixed-time sliding-mode fault-tolerant controller can obviously improve the dynamic performance of the system.

Linearized J2 and Atmospheric Drag Model for Control of Inner-Formation Satellite System in Elliptical Orbits

2016 ◽  
Vol 138 (5) ◽  
Author(s):  
Lu Cao ◽  
Hengnian Li
Keyword(s):  
Formation Control ◽  
Sliding Mode ◽  
Satellite System ◽  
Atmospheric Drag ◽  
Error Feedback ◽  
Real Time Control ◽  
Special Configuration ◽  
Drag Model ◽  
Time Control

A new set of linearized differential equations governing relative motion of inner-formation satellite system (IFSS) is derived with the effects of J2 as well as atmospheric drag. The IFSS consists of the “inner satellite” and the “outer satellite,” this special configuration formation endows its some advantages to map the gravity field of earth. For long-term IFSS in elliptical orbit, the high-fidelity set of linearized equations is more convenient than the nonlinear equations for designing formation control system or navigation algorithms. In addition, to avoid the collision between the inner satellite and the outer satellite, the minimum sliding mode error feedback control (MSMEFC) is adopted to perform a real-time control on the outer satellite in the presence of uncertain perturbations from the system and space. The robustness and steady-state error of MSMEFC are also discussed to show its theoretical advantages than traditional sliding mode control (SMC). Finally, numerical simulations are performed to check the fidelity of the proposed equations. Moreover, the efficacy of the MSMEFC is performed to control the IFSS with high precision.

scholarly journals Sliding Mode Real-Time Control of Photovoltaic Systems Using Neural Estimators

2016 ◽  
Vol 2016 ◽  
pp. 1-16 ◽  
Author(s):  
J. A. Ramos-Hernanz ◽  
O. Barambones ◽  
J. M. Lopez-Guede ◽  
I. Zamora ◽  
P. Eguia ◽  
...  
Keyword(s):  
Sliding Mode ◽  
Weather Conditions ◽  
Maximum Power ◽  
Photovoltaic Module ◽  
Real Time Control ◽  
Maximum Power Point ◽  
Point Tracking ◽  
Time Control ◽  
Power Point ◽  
Artificial Neuronal Network

The maximum power point tracking (MPPT) problem has attracted the attention of many researchers, because it is convenient to obtain the maximum power of a photovoltaic module regardless of the weather conditions and the load. In this paper, a novel control for a boost DC/DC converter has been introduced. It is based on a sliding mode controller (SMC) that takes a current signal as reference instead of a voltage, which is generated by a neuronal reference current generator. That reference current indicates the current (IMPP) at the maximum power point (MPP) for given weather conditions. In order to test the designed control system, a photovoltaic module model based on a second artificial neuronal network (ANN) has been obtained from experimental data gathered during 18 months in the Faculty of Engineering Vitoria-Gasteiz (Spain). We have analyzed the performance of such model and we found that it is very accurate (MSE = 0.062 A andR= 0.991 with test dataset). We also have tested the performance of the overall SMC design with both simulated and real tests, concluding that it guarantees that the power in the output of the converter is very close to the power of the photovoltaic module output.

Real time control via a high order sliding mode controller of a multi-cellular converter

2009 ◽  
Vol 42 (17) ◽  
pp. 346-351
Author(s):  
M. DJEMAI ◽  
K. BUSAWON ◽  
K. BENMANSOUR ◽  
A. MAROUF
Keyword(s):  
Real Time ◽  
Sliding Mode ◽  
High Order ◽  
Sliding Mode Controller ◽  
Real Time Control ◽  
Time Control

Study on Smooth Sliding Mode Control of Parallel Robot

2014 ◽  
Vol 933 ◽  
pp. 379-383
Author(s):  
Cai Hong Zhu ◽  
Hong Sun ◽  
Hong Tao Zhang
Keyword(s):  
Sliding Mode Control ◽  
Control Algorithm ◽  
Sliding Mode ◽  
Parallel Robot ◽  
Small Error ◽  
Step Motor ◽  
Real Time Control ◽  
Mode Control ◽  
Time Control ◽  
New Type

Parallel robot possesses the characteristics of large rigidity, strong load bearing capacity and small error. Directed against the new-type parallel robot mechanism with step motor drive, the closed-formed solutions were developed for both inverse and direct kinematics, a track planning in its workspace has been carried out, and a model of control system was establish, after that a kind of sliding mode control algorithm was designed, and a simulative experiment was made on the Matlab/Simulink. It is shown that the parallel robot system using the proposed control algorithm does not have the chattering problem. The system has good robustness, and is robust to the uncertainties and disturbance, and has good performance in tracking, and high precision real-time control on this parallel robot is achieved.

The Design of Yarn Constant Tension Feeder System

2013 ◽  
Vol 274 ◽  
pp. 294-298
Author(s):  
Mei Lan Zhou ◽  
Yan Hui Fu ◽  
Zhen Qiu He ◽  
Rui Liu
Keyword(s):  
Real Time ◽  
Error Detection ◽  
Low Cost ◽  
Dynamic Performance ◽  
Control Unit ◽  
Motor Speed ◽  
Real Time Control ◽  
Yarn Tension ◽  
Time Control ◽  
Constant Tension

A novel constant tension yarn feed control system for automatic winder is presented in this paper which is based on analyzing the principle of the generation of yarn tension and the factors which make the tension fluctuate. DSP28035 made by TI (Texas Instruments) is adopted as the main control unit of the system to acquire the real-time yarn tension which is transmitted from a yarn tension sensor. Intelligent PID (proportional-integral-derivative) algorithm is also adopted to achieve a high-dynamic performance and an ultra-low inertia servo motor speed digital control to realize constant yarn tension feed. The system not only have the function of tension setting, over current protection, error detection and alarm, but also possess the features of simple structure, low cost, real-time control and high accuracy.

Sign in / Sign up

Export Citation Format

Share Document