scholarly journals Fixed Frequency Sliding Mode Control of Power Converters for Improved Dynamic Response in DC Micro-Grids

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2799 ◽  
Author(s):  
Abdul Yasin ◽  
Muhammad Ashraf ◽  
Aamer Bhatti
Keyword(s):  
Renewable Energy ◽  
Sliding Mode Control ◽  
Sliding Mode ◽  
Voltage Regulation ◽  
Pi Controller ◽  
Switching Frequency ◽  
Fixed Frequency ◽  
Mode Control ◽  
Micro Grid ◽  
Micro Grids

The rapid decrease in conventional energy resources and their harmful impact on the environment has brought the attention of the researchers towards the use of renewable energy technologies. The renewable energy systems are connected to Direct Current (DC) micro-grids via power electronic converters where the load conditions are unknown and network parameters are uncertain. These conditions call for the use of robust control techniques such as Sliding Mode Control (SMC) in order to regulate the grid voltage. However, SMC has a drawback of operating the power converter at variable switching frequency which results in degrading the power quality. This paper introduces a fixed frequency sliding mode controller that does not suffer from this predicament. A novel double integral type switching manifold is proposed to achieve voltage regulation of a DC micro-grid, in the presence of unknown load demands and un-modeled dynamics of the network. Rigorous mathematical analysis is carried out for the stability of the closed loop system and the technique is experimentally validated on position of a DC micro-grid using a specially designed test rig. For benchmarking purposes, a conventional Proportional Integral (PI) controller is also implemented. An improvement of 2.5% in rise time, 6.7% in settling time and reduction of voltage dip by 31.7% during load transaction is achieved as compared to the PI controller. The experiment confirms the hypothesis that fixed frequency SMC shows better performance than its counterpart in the phase of introduced disturbances.

Fixed frequency sliding mode control of renewable energy resources in DC micro grid

2019 ◽  
Vol 21 (4) ◽  
pp. 2074-2086 ◽  
Author(s):  
Abdul Rehman Yasin ◽  
Muhammad Ashraf ◽  
Aamer Iqbal Bhatti ◽  
Ali Arshad Uppal
Keyword(s):  
Renewable Energy ◽  
Sliding Mode Control ◽  
Sliding Mode ◽  
Energy Resources ◽  
Renewable Energy Resources ◽  
Fixed Frequency ◽  
Mode Control ◽  
Micro Grid

scholarly journals Fractional Order Sliding Mode Control Design for a Buck Converter Feeding Resistive Power Loads

2020 ◽  
Vol 7 (4) ◽  
pp. 649-658
Author(s):  
Nasim Ullah
Keyword(s):  
Control System ◽  
Sliding Mode Control ◽  
Fractional Order ◽  
Pid Control ◽  
Sliding Mode ◽  
Voltage Regulation ◽  
Buck Converter ◽  
Mode Control ◽  
Power Load ◽  
Micro Grid

Standalone DC micro-grid requires highly efficient power converters with high performance robust controllers. This research work deals with the hardware implementation of a load side buck converter and its control system integrated in a DC micro-grid system. This paper presents a novel fractional order sliding mode control (FSMC) method for voltage regulation of a buck converter feeding a constant power load. FSMC controller is derived based on the average state space model of the buck converter and its stability is verified using Lyapunov theorem. Finally, the FSMC controller is implemented using Arduino mega 2560 processor and the obtained results are compared with classical sliding mode control (SMC), proportional, integral, derivative (PID) control and fractional order PID control system (FOPID under constant and variable resistive loading.

scholarly journals Switching Frequency Regulation in Sliding Mode Control by a Hysteresis Band Controller

2017 ◽  
Vol 32 (2) ◽  
pp. 1557-1569 ◽  
Author(s):  
Victor Repecho ◽  
Domingo Biel ◽  
Josep M. Olm ◽  
Enric Fossas Colet
Keyword(s):  
Sliding Mode Control ◽  
Sliding Mode ◽  
Frequency Regulation ◽  
Switching Frequency ◽  
Mode Control

A robust cascaded controller for DC-DC Boost and Cuk converters

2017 ◽  
Vol 14 (5) ◽  
pp. 459-466 ◽  
Author(s):  
Fiaz Ahmad ◽  
Akhtar Rasool ◽  
Esref Emre Ozsoy ◽  
Asif Sabanoviç ◽  
Meltem Elitas
Keyword(s):  
Sliding Mode Control ◽  
Sliding Mode ◽  
Supply Voltage ◽  
Load Resistance ◽  
Switching Frequency ◽  
Content Type ◽  
Mode Control ◽  
Control Scheme ◽  
Equivalent Control ◽  
Discontinuous Nature

Purpose This paper aims to propose a robust cascaded controller based on proportional-integral (PI) and continuous sliding mode control. Design/methodology/approach Cascaded control structure is an attractive control scheme for DC-DC power converters. It has a two-loop structure where the outer loop contains PI controller and the inner loop uses sliding mode control (SMC). This structure thus combines the merits of both the control schemes. However, there are some issues that have prohibited its adoption in industry, the discontinuous nature of SMC which leads to variable switching frequency operation and is hard to realize practically. This paper attempts to overcome this issue by changing the discontinuous functionality of SMC to continuous by utilizing the concept of equivalent control. Findings The robustness of the controller designed is verified by considering various cases, namely, ideal case with no uncertainties, sudden variation of input supply voltage, load resistance, reference voltage, circuit-parameters and for noise disturbance. The controller effectiveness is validated by simulating the DC-DC boost and Cuk converters in SimPowerSystems toolbox of MATLAB/Simulink. It is shown that the performance of the proposed controller is satisfactory, and both reference output voltage and inductor current are tracked with little or no sensitivity to disturbances. Originality/value The results for various scenarios are interesting and show that the controller works quite satisfactorily for all the simulated uncertainties.

Fixed Switching Frequency Sliding Mode Control for Single-Phase Unipolar Inverters

2012 ◽  
Vol 27 (5) ◽  
pp. 2507-2514 ◽  
Author(s):  
Adib Abrishamifar ◽  
Ahmad Ahmad ◽  
Mustafa Mohamadian
Keyword(s):  
Sliding Mode Control ◽  
Single Phase ◽  
Sliding Mode ◽  
Switching Frequency ◽  
Mode Control
Sign in / Sign up

Export Citation Format

Share Document