Digital control strategy for a buck converter operating as a battery charger for stand-alone photovoltaic systems

Seguel, Julio López; Seleme, Seleme Isaac; Donoso, P.F.; Morais, Lenin Martins Ferreira; Cortizo, P.C.; Severo, M.A.

doi:10.1016/j.solener.2016.11.005

Cited by 41 publications

(27 citation statements)

References 12 publications

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“…Another important application in which batteries are extensively used is the construction of stand-alone renewable power systems, which are common solutions for remote energy generation and urban/distributed energy systems for pollution reduction [13,14]. A common structure of such power systems based on renewable generators and batteries is presented in Figure 1 [15][16][17][18][19][20][21][22]. Such an architecture has a renewable energy source as the main energy generator, e.g., photovoltaic modules or fuel cell, interacting with a unidirectional DC/DC converter that is responsible for optimizing the source operating conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Due to safety implications for the source and load, there are many research papers focused on regulating the DC bus voltage using charger/discharger converters: some of them are based on linear control [16,[23][24][25][26], others are based on intelligent control [13,[27][28][29][30][31][32], and others are based on non-linear control strategies [15,[17][18][19][20][21][22]. In particular, sliding-mode controllers (SMCs) have been widely used for this application to ensure global stability, robustness to parameter tolerances, higher bandwidth compared with classical linear controllers [17,22,33], and reduced implementation cost and complexity compared with intelligent controllers [31,34]. For example, the work reported in [15] proposed an SMC for the charger/discharger converter of the stand-alone power system described in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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Control of a Charger/Discharger DC/DC Converter with Improved Disturbance Rejection for Bus Regulation

2018

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Stand-alone power systems based on renewable energy sources are widely used for energy generation in remote locations and for distributed generation in urban environments. The DC bus is an essential component of these systems since it enables power transmission between the sources, loads and batteries. The batteries are interfaced with the bus using a charger/discharger DC/DC converter, which is controlled to regulate the DC bus voltage under any operating conditions. This is an important task because unsafe over-voltages and under-voltages in the bus could damage the sources, loads and power converters. This paper proposes a sliding-mode controller for a charger/discharger DC/DC converter with improved disturbance rejection to provide a tight bus voltage regulation for safe operation. The main novelty of this solution is the inclusion of the bus current in the sliding surface, which accelerates the controller response. Moreover, a formal proof of the system global stability is provided, and a detailed process is developed to calculate the controller and implementation parameters. Finally, the proposed solution is validated through simulations and experiments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Control of a Charger/Discharger DC/DC Converter with Improved Disturbance Rejection for Bus Regulation

2018

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“…Similarly, if the switch is in OFF (0) position, the charging controller [11][12][13] will be ON and the LUO converter enabled, and the converter output is applied to the battery. This waveform will clearly explain the variation of duty cycle and the importance of secondary side control by the LUO converter, where battery charging 14,15 can be done with high duty ratio when compared to the inverter connected to the LED load.…”

Section: Simulation Of Ipt Full System Control (Primary and Secondarymentioning

confidence: 98%

Optimization of power losses in electric vehicle battery by wireless charging method with consideration of the laser optic effect

Nayagam

Premalatha

2020

Measurement and Control

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This work mainly deals with replacing the wired power transmission method for charging electric vehicle with the help of an efficient wireless power transmission method. For identifying an efficient wireless power transmission method, the inductive power transfer method and the laser optic method are taken into consideration to charge the electric vehicle battery. These methods are compared by hardware implementation for various conditions. Wireless power transmission is an emerging technology utilized to charge the electric vehicle battery through an air gap. The use of this new charging technique is due to its easy access from annoying charging cables, better efficiency, and smaller charging time. Also, it contributes to the remarkable reduction of pollutants and carbon dioxide (CO 2 ) emissions into the atmosphere by the conventional vehicles. However, the implementation of inductive charging for electric vehicle still presents challenges in terms of power transfer efficiency, transmission distance, utilization of heavy batteries with ripple-free and charging time, and stress on compensation network to maintain resonant condition for maximum power transfer. This system will be verified through the simulation in MATLAB/Simulink environment. The simulation results of the inductive power transfer method and the comparison of hardware setup results with laser optic hardware setup have to be verified.

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“…Moreover, DC MGs are formed by distributed generators (DGs), ESS, and electrical loads [8][9][10][11]. In particular, photovoltaic systems (PVSs) are commonly included in DC MGs as DGs due to the wide availability of solar energy [12]; and the integration of a PVS, an ESS, and loads is known as a stand-alone photovoltaic system (SPVS) [13]. Those SPVSs are used in multiple applications for attending non-critical loads, such as plug-in chargers for electrical vehicles, lighting systems, television sets, data centers (facility lighting or non-critical workstations used for log files inspection), air-conditioning, home applications, among others [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Energy Management in PV Based Microgrids Designed for the Universidad Nacional de Colombia

et al. 2020

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Stand-alone Electrical microgrids (MGs) require power management strategies to extend the life-time of their devices and to guarantee the global power balance of non-critical loads such as lighting of small sections of an university campus or individual air conditioning systems. This paper proposes an energy management strategy (EMS) for an isolated DC microgrid formed by a photovoltaic system (PVS), an energy storage system (battery), and a noncritical load. This configuration enables the photovoltaic system to control the power generation and ensures that the storage element does not exceed the safe limits of the state of charge. To control the generation of the photovoltaic system, two operating modes based on the perturb and observe (P&O) algorithm are implemented. The first one performs a maximum power point tracking (MPPT) action, while the second one regulates the power generated by the PVS to match the load requirement (power demand tracking, PDT). The management strategy also considers different operating states for ensuring the battery safety: normal operation, overcharge (at the maximum state of charge), and bulk charge (at the minimum state of charge); in those states the disconnection/connection of both the battery and the load is also considered. The main contribution of this work is to design and test a control strategy for an EMS aimed at regulating a standalone microgrid based on a PV system and an energy storage device. This solution is validated using detailed MG circuital simulations, which includes the PV source model (single-diode model), lithium-ion battery model, constant power load model and the DC/DC converters equations; moreover, realistic power generation and demand from Universidad Nacional de Colombia, located at Medellín-Colombia, are considered. The results obtained demonstrate the effectiveness of the energy management strategy, and in this way, enable to extend the battery lifetime and reduce the costs associated to the maintenance and disconnection of the microgrid in educational buildings or other applications focused on this type of DC microgrid.

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Digital control strategy for a buck converter operating as a battery charger for stand-alone photovoltaic systems

Cited by 41 publications

References 12 publications

Control of a Charger/Discharger DC/DC Converter with Improved Disturbance Rejection for Bus Regulation

Control of a Charger/Discharger DC/DC Converter with Improved Disturbance Rejection for Bus Regulation

Optimization of power losses in electric vehicle battery by wireless charging method with consideration of the laser optic effect

Energy Management in PV Based Microgrids Designed for the Universidad Nacional de Colombia

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