scholarly journals Enhanced Exponential Reaching Law-Based Sliding Mode Control of ShAPF in an EDS

2021 ◽  
Vol 18 (1) ◽  
pp. 52-61
Author(s):  
Satish Kumar Gudey ◽  
Vinay Kumar Naguboina
Keyword(s):  
Distribution System ◽  
Sliding Mode ◽  
Settling Time ◽  
Reference Source ◽  
Shunt Active Power Filter ◽  
Current Harmonics ◽  
Reaching Law ◽  
Three Phase ◽  
Source Current ◽  
Exponential Reaching Law

In this paper a three phase Shunt Active Power Filter (ShAPF) is proposed to address the current related issues in a three phase Electrical Distribution System (EDS). A sliding mode controller (SMC) and an Enhanced Exponential Reaching Law based SMC (EERL-SMC) is proposed for a ShAPF to compensate the load current. The controller’s performance is tested by injecting the current harmonics into the system. A non-linear load along with different loads on the distribution side is connected in parallel in a distribution network at Point of common coupling (PCC). Modelling of the system is done using state space analysis. Stability of the system is analyzed using the state feedback approach. The reference source currents are generated using instantaneous PQ theory. For variations in the load, the THD in the source current is realized. It is found that EERL-SMC is more effective for a ShAPF in reducing the high frequency oscillations and settling time for convergence. The source voltage and current waveforms are observed to be sinusoidal in nature. Both the controllers are effective in reducing the THD levels in the source current as per the IEEE standards. A comparison between the controllers is presented in terms of settling time, THD in source current. PSCAD v4.6 is used for simulation works.

scholarly journals An enhanced exponential reaching law based sliding mode control strategy for a three phase ups system

2020 ◽  
Vol 17 (3) ◽  
pp. 313-336
Author(s):  
Venkatesh Nayak ◽  
Satish Gudey
Keyword(s):  
Steady State ◽  
Sliding Mode Control ◽  
Frequency Response ◽  
Sliding Mode ◽  
Higher Order ◽  
System Stability ◽  
Reaching Law ◽  
Three Phase ◽  
Sinusoidal Waveform ◽  
Exponential Reaching Law

UPS is used to deliver a high quality sinusoidal waveform to consumers without any interruptions. This work proposes an Enhanced Exponential Reaching Law (EERL) based Sliding Mode Control (SMC) for a three- phase UPS 30 kVA system used in industrial Applications. The work presents the application of proposed controller on the rectifier side as well as on the inverter side feeding a linear and/or a nonlinear load. Mathematical models of the three phase rectifier (AC/DC) and three phase inverter (DC/AC) are derived. Frequency response characteristics are plotted to observe the system stability using state feedback approach. A DC/DC buck/boost converter is utilised for charging and discharging of battery which acts as a secondary power source for the UPS to feed critical loads. It also maintains power balance. The design of SMC, HOSMC and EERL-SMC are presented. The EERL based SMC is used in this work to obtain a pure sinusoidal waveform with less settling time compared to a conventional SMC. It is robust against sudden changes in load and is more efficient compared to SMC and higher order sliding mode controller (HOSMC). Using EERL, chattering phenomenon can be very much reduced with less steady state error. Chattering is observed through phase plane plots in this paper. The system is presented with both linear and nonlinear loads. A comparison is brought with respect to a classical SMC and a higher order SMC (super twisting algorithm) for a UPS system. EERL-SMC performs better in terms of pure sinusoidal waveform, good tracking, less settling time (4ms) and less steady state error (1.74%) with low THD (0.12%). It can be an alternative to a HOSMC. Simulation studies are presented in PSCAD/EMTDC version 4.6. The system stability conditions are analysed from frequency response plots obtained through MATLR2012b platform.

scholarly journals Exponential Reaching Law and Sensorless DTC IM Control with Neural Network Online Parameters Estimation based on MRAS

2018 ◽  
Vol 7 (2) ◽  
pp. 77
Author(s):  
Legrioui Said ◽  
Rezgui Salah Eddine ◽  
Benalla Hocine
Keyword(s):  
Neural Network ◽  
Time Constant ◽  
Sliding Mode ◽  
Direct Torque Control ◽  
Parameters Estimation ◽  
Torque Control ◽  
System Control ◽  
Reaching Law ◽  
Exponential Reaching Law ◽  
Stator Resistance

The most important problem in the control of induction machine (IM) is the change of its parameters, especially the stator resistance and rotor-time constant. The objective of<em> </em>this paper is to implement a new strategy in sensorless direct torque control (DTC) of an IM drive. The rotor flux based model reference adaptive system (MRAS) is used<em> </em>to estimate conjointly<em> </em>the rotor<em> </em>speed, the stator resistance and the inverse rotor time constant, the process of the estimation is performed on-line by a new MRAS-based artificial neural network (ANN) technique. Furthermore, the drive is complemented with a new exponential reaching law (ERL), based on the sliding mode control (SMC) to significantly improve the performances of the system control compared to the conventional SMC which is known to be susceptible to the annoying chattering phenomenon. An experimental investigation was carried out via the Matlab/Simulink with real time interface (RTI) and dSPACE (DS1104) board where the behavior of the proposed method was tested at different points of IM operation.

Study on Active Suspension with Variable Structure Control Based on the Fractional Order Exponential Reaching Law

2017 ◽  
Vol 872 ◽  
pp. 337-345
Author(s):  
Yan Dong Chen
Keyword(s):  
Fractional Order ◽  
Reference Model ◽  
Sliding Mode ◽  
Variable Structure Control ◽  
Variable Structure ◽  
Active Suspension ◽  
Mode Switching ◽  
Structure Control ◽  
Reaching Law ◽  
Exponential Reaching Law

Based on the dynamic model of 1/4 vehicle suspension, an active control system is designed using the fractional order exponential reaching law of model following variable structure control strategy. An active suspension with linear quadratic optimal control is used as the reference model. The sliding mode switching surface parameters is designed by pole placement method to ensure the stability of the system. At the same time, combined with the index reaching law proposed by Professor Gao Wei Bing and the definition and properties of fractional index, constructs a similar fractional order exponent reaching law to improve the dynamic quality of sliding mode motion. And in MATLAB, system modeling and controller design are implemented. By setting up experiments, the different suspensions are compared. The results show that compared with the passive suspension, the performance of the vehicle can be improved better, and the performance of the tracking reference model has good tracking performance. Moreover, compared with the integral exponential reaching law, the chattering can be more effectively weakened. Finally, before and after the change of vehicle parameters in the simulation, the results show that the system has good robustness.

A Shunt Active Power Filter for 12 Pulse Converter Using Source Current Detection Approach

2016 ◽  
Vol 7 (1) ◽  
pp. 225 ◽  
Author(s):  
Rajesh T ◽  
Nirmalkumar A
Keyword(s):  
Distribution System ◽  
Active Power Filter ◽  
Active Power ◽  
Detection Methods ◽  
Shunt Active Power Filter ◽  
Power Distribution System ◽  
Power Filter ◽  
Pulse Converter ◽  
Source Current ◽  
Current Detection

A shunt Active Power Filter (APF) with current detection at the source side is considered as a closed-loop system from the view of the whole power distribution system, which is expected with better harmonics filtering performance compared with conventional current detection methods such as load current detection and open loop control.  This paper introduces an efficient source current detection method (direct) control scheme to mitigate the grid current harmonics generated by the twelve pulse converter.  The proposed system uses Control Rectifier (12 –pulse converter) which efficiently regulates the DC voltage by varying the angle of each 6 pulse converter. Moreover, the proposed system uses three winding transformer which eliminates the harmonics during equal angles switching at each six pulse converter which in turn simplifies the operation of the SAPF. The proposed system is simulated in MATLAB SIMULINK to evaluate the performance of the proposed system.

scholarly journals Design and Simulation of three Phase three Wire Shunt Active Filter using Instantaneous PQ Theory

2020 ◽  
Vol 15 (1) ◽  
pp. 181-186
Author(s):  
Tilak Giri ◽  
Ram Prasad Pandey ◽  
Sabin Bhandari ◽  
Sujan Moktan ◽  
Lagat Karki
Keyword(s):  
Power Factor ◽  
Communication Systems ◽  
Reactive Power ◽  
Active Filter ◽  
Shunt Active Filter ◽  
Current Harmonics ◽  
Passive Filter ◽  
Three Phase ◽  
Wide Range ◽  
Source Current

Due to intensive use of power converters and other non-linear loads, power quality is degrading. The presence of harmonics in the power lines result in greater power losses in distribution, interference problems in communication systems. Non linearity reduces the efficiency and power factor of the system. As the power factor reduces, the reactive power demanded from the supply increases which have no any contribution in energy transfer, so compensation is required. For this, shunt passive filter has been developed but it is bulky and frequency dependent and has many drawbacks. In contrast to passive filter, shunt active filter (SAF) has been developed which is smaller and has wide range of applications. In this paper, shunt active filter based on p-q theory is demonstrated for compensating reactive power and current harmonics. Simulation has been done with and without SAF and results are presented and ended with recommendation and conclusion. An effort is made to reduce the THD of the source current below 5% (specified by IEEE).

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