Charging/discharging system based on zeta/sepic converter and a sliding mode controller for dc bus voltage regulation

This paper proposes a composite nonlinear controller combining backstepping and double-integral sliding mode controllers for DC–DC boost converter (DDBC) feeding by constant power loads (CPLs) to improve the DC-bus voltage stability under large disturbances in DC distribution systems. In this regard, an exact feedback linearization approach is first used to transform the nonlinear dynamical model into a simplified linear system with canonical form so that it becomes suitable for designing the proposed controller. Another important feature of applying the exact feedback linearization approach in this work is to utilize its capability to cancel nonlinearities appearing due to the incremental negative-impedance of CPLs and the non-minimum phase problem related to the DDBC. Second, the proposed backstepping double integral-sliding mode controller (BDI-SMC) is employed on the feedback linearized system to determine the control law. Afterwards, the Lyapunov stability theory is used to analyze the closed-loop stability of the overall system. Finally, a simulation study is conducted under various operating conditions of the system to validate the theoretical analysis of the proposed controller. The simulation results are also compared with existing sliding mode controller (ESMC) and proportional-integral (PI) control schemes to demonstrate the superiority of the proposed BDI-SMC.

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Barrier Function Based Adaptive Sliding Mode Controller for a Hybrid AC/DC Microgrid Involving Multiple Renewables

Applied Sciences ◽

10.3390/app11188672 ◽

2021 ◽

Vol 11 (18) ◽

pp. 8672

Author(s):

Ammar Armghan ◽

Mudasser Hassan ◽

Hammad Armghan ◽

Ming Yang ◽

Fayadh Alenezi ◽

...

Keyword(s):

Barrier Function ◽

Sliding Mode ◽

Renewable Energy Sources ◽

Energy System ◽

Voltage Regulation ◽

Sliding Mode Controller ◽

Dc Microgrid ◽

Adaptive Sliding Mode ◽

Adaptive Sliding Mode Controller ◽

Bus Voltage

Conventional electricity generation methods are under the major revolution, and microgrids established on renewable energy sources are playing a vital role in this power generation transformation. This study proposes a hybrid AC/DC microgrid with a barrier function-based adaptive sliding mode controller, in which 8 kW wind energy system and 4.5 kW photovoltaic energy system perform as the hybrid RESs, and 33 Ah of battery works as the energy storage system. Barrier function-based adaptive sliding mode controller ensures the convergence of the system’s output variable independent of the knowledge of the upper bound of the disturbances. Firstly, global mathematical modeling of the suggested system is ensured. Then, the control laws are defined, providing the DC bus voltage regulation during islanding mode and AC/DC link bus voltage regulation during the grid-connected mode. The proposed barrier function-based adaptive sliding mode controller technique is analyzed through 20 s simulations on MATLAB/Simulink, which validates the controller’s robustness and effectiveness. Furthermore, a comparison of the proposed controller is made with the proportional integral derivative controller, Lyapunov controller, and sliding mode controller. In the end, hardware-in-loop tests are performed using C2000 Delfino MCU F28379D LaunchPad, showing the proposed structure’s real-time performance.

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DC bus voltage regulation in the presence of constant power load using sliding mode controlled dc-dc Bi-directional converter interfaced storage unit

2015 IEEE First International Conference on DC Microgrids (ICDCM) ◽

10.1109/icdcm.2015.7152050 ◽

2015 ◽

Cited By ~ 6

Author(s):

Aditya R. Gautam ◽

Suresh Singh ◽

Deepak Fulwani

Keyword(s):

Sliding Mode ◽

Voltage Regulation ◽

Storage Unit ◽

Constant Power ◽

Power Load ◽

Dc Bus ◽

Bus Voltage ◽

Constant Power Load

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Sliding Mode Control of DC Bus Voltage of a Hybrid Sources using Fuel Cell and Supercapacitors for Traction System

2007 IEEE International Symposium on Industrial Electronics ◽

10.1109/isie.2007.4374628 ◽

2007 ◽

Cited By ~ 6

Author(s):

Mohamed-Yacine Ayad ◽

Mohamed Becherif ◽

Abdesslem Djerdir ◽

Abdellatif Miraoui

Keyword(s):

Fuel Cell ◽

Sliding Mode Control ◽

Sliding Mode ◽

Mode Control ◽

Dc Bus ◽

Bus Voltage ◽

Traction System

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Nonlinear Control of a Satellite Electrical Power System Based on the Sliding Mode Control

ISRN Aerospace Engineering ◽

10.1155/2013/253564 ◽

2013 ◽

Vol 2013 ◽

pp. 1-8

Author(s):

Mohammad Rasool Mojallizadeh ◽

Bahram Karimi

Keyword(s):

Power System ◽

Sliding Mode ◽

Electrical Power ◽

Voltage Regulation ◽

Sliding Mode Controller ◽

Electrical Power System ◽

Load Variations ◽

Point Tracking ◽

Power Point Tracking ◽

Power Point

The power electronic interface between a satellite electrical power system (EPS) with a photovoltaic main source and battery storage as the secondary power source is modelled based on the state space averaging method. Subsequently, sliding mode controller is designed for maximum power point tracking of the PV array and load voltage regulation. Asymptotic stability is ensured as well. Simulation of the EPS is accomplished using MATLAB. The results show that the outputs of the EPS have good tracking response, low overshoot, short settling time, and zero steady-state error. The proposed controller is robust to environment changes and load variations. Afterwards, passivity based controller is provided to compare the results with those of sliding mode controller responses. This comparison demonstrates that the proposed system has better transient response, and unlike passivity based controller, the proposed controller does not require reference PV current for control law synthesis.

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Bus Voltage Control of DC Distribution Network Based on Sliding Mode Active Disturbance Rejection Control Strategy

Energies ◽

10.3390/en13061358 ◽

2020 ◽

Vol 13 (6) ◽

pp. 1358 ◽

Cited By ~ 1

Author(s):

Boning Wu ◽

Xuesong Zhou ◽

Youjie Ma

Keyword(s):

Disturbance Rejection ◽

Sliding Mode ◽

Distribution Network ◽

Sliding Mode Controller ◽

Active Disturbance Rejection Control ◽

State Variables ◽

Active Disturbance Rejection ◽

Dc Distribution ◽

Disturbance Rejection Control ◽

Bus Voltage

The DC distribution network has more advantages in power transmission, grid connection of distributed energy, and reliability of power supply when compared with AC distribution network, but there are still many problems in the development of DC distribution network. DC bus voltage control is one of the hot issues in the research of DC distribution network. To solve this problem, in this paper, a new type of sliding mode active disturbance rejection control (SMADRC) controller for AC/DC converters is designed and applied to the voltage outer loop. The linear extended state observer (LESO) can observe the state variables and the total disturbance of the system. The SMADRC is composed of a sliding mode controller, LESO, and disturbance compensator, which can compensate the total disturbance observed by LESO properly. Therefore, it improves the dynamic. At the same time, it can also reduce the system jitter that is caused by sliding mode controller. The state variables that are observed by the LESO are used in the design of sliding mode controller, which greatly simplifies the design of sliding mode controller. Finally, the simulation results of Matlab/Simulink show that the controller has good start-up performance and strong robustness.

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Performance Evaluation of Series DC-ES for DC bus Voltage Regulation on Different Non-Critical Loads and Under FRT Support

2020 IEEE International Conference on Power Electronics, Smart Grid and Renewable Energy (PESGRE2020) ◽

10.1109/pesgre45664.2020.9070579 ◽

2020 ◽

Author(s):

S. P. Gawande ◽

R. N. Nagpure ◽

Kalyani Dhawad ◽

M. A. Waghmare ◽

Anurag R. Nagpure ◽

...

Keyword(s):

Performance Evaluation ◽

Critical Loads ◽

Voltage Regulation ◽

Dc Bus ◽

Bus Voltage

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Improved Dynamic Voltage Regulation in a Droop Controlled DC Nanogrid Employing Independently Controlled Battery and Supercapacitor Units

Applied Sciences ◽

10.3390/app8091525 ◽

2018 ◽

Vol 8 (9) ◽

pp. 1525

Author(s):

Ahmad M. A. Malkawi ◽

Luiz A. C. Lopes

Keyword(s):

Energy Storage ◽

Storage System ◽

Voltage Regulation ◽

Potential Contribution ◽

Pass Filter ◽

Power Sources ◽

Dynamic Voltage ◽

Dc Bus ◽

Bus Voltage ◽

The Impact

DC bus voltage signaling (DBS) and droop control are frequently employed in DC nano and microgrids with distributed energy resources (DERs) operating in a decentralized way. This approach is effective in enforcing the desired contributions of power sources and energy storage systems (ESSs) in steady-state conditions. The use of supercapacitors (SCs) along with batteries in a hybrid energy storage system (HESS) can mitigate the impact of high and fast current variations on the losses and lifetime of the battery units. However, by controlling the HESS as a single unit, one forfeits the potential contribution of the SC and its high power capabilities to dynamically improve voltage regulation in a DC nanogrid. This paper discusses an approach where the SC interface is controlled independently from the battery interface, with a small droop factor and a high pass filter (HPF), to produce high and short current pulses and smooth DC bus voltage variations due to sudden power imbalances in the DC nanogrid. Experimental results are presented to show that, unlike in a conventional HESS, the SC unit can be used to improve the dynamic voltage regulation of the DC nanogrid and, indirectly, mitigate the high and fast current variations in the battery.

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