Control Issues in Single-Stage Photovoltaic Systems: MPPT, Current and Voltage Control

Mastromauro, Rosa Anna; Liserre, Marco; Dell’Aquila, A.

doi:10.1109/tii.2012.2186973

Cited by 280 publications

(116 citation statements)

References 66 publications

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“…This is particularly advantageous for DGs since their energy can be used more efficiently. According to this rule, a PV generation of the DC-side in a hybrid microgrid, which consists of the PV array, DC/DC converter, and local control, should operate in the MPPT mode based on the perturb and observe (P & O) method [38,39]. On the other hand, the PV generation system of AC-side consists of the PV array, cascaded DC/DC/AC converter, output filters, and local control system.…”

Section: Vdc/vac Droop Control (Droop-1)mentioning

confidence: 99%

A Coordinated Control for Photovoltaic Generators and Energy Storages in Low-Voltage AC/DC Hybrid Microgrids under Islanded Mode

et al. 2016

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Abstract:The increasing penetration of renewable generators can be a significant challenge due to the fluctuation of their power generation. Energy storage (ES) units are one solution to improve power supply quality and guarantee system stability. In this paper, a hybrid microgrid is built based on photovoltaic (PV) generator and ES; and coordinated control is proposed and developed to achieve power management in a decentralized manner. This control scheme contains three different droop strategies according to characteristics of PV and ES. First, the modified droop control is proposed for PV, which can take full utilization of renewable energy and avoid regulating output active power frequently. Second, to maintain the direct current (DC) bus voltage stability, a novel droop control incorporating a constant power band is presented for DC-side ES. Third, a cascade droop control is designed for alternating current (AC)-side ES. Thus, the ES lifetime is prolonged. Moreover, interlinking converters (ICs) provide a bridge between AC/DC buses in a hybrid microgrid. The power control of IC is enabled when the AC-or DC-side suffer from active power demand shortage. In particular, if the AC microgrid does not satisfy the reactive power demand, IC then acts as a static synchronous compensator (STATCOM). The effectiveness of the proposed strategies is verified by simulations.

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Section: Vdc/vac Droop Control (Droop-1)mentioning

confidence: 99%

A Coordinated Control for Photovoltaic Generators and Energy Storages in Low-Voltage AC/DC Hybrid Microgrids under Islanded Mode

et al. 2016

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“…R. A. Mastromauro [2012] introduced a survey on three of the main control issues for single-stage PVS: MPPT and current and voltage control. MPPT algorithms aim at maximizing the power extraction from the PV panels.…”

Section: Literature Reviewmentioning

confidence: 99%

“…After the value of load resistance is obtained, (5) can be rewritten into (7). Then, the duty cycle can be calculated by substituting the desired voltage (Vmpp) and current (Impp) of PV module into (7) as follows: (7) where a = I pv V pv R load…”

Section: ……………(5)mentioning

confidence: 99%

A Fast-Converging MPPT Technique for Photovoltaic System with Modified SEPIC Converter under Fast- Varying Solar Irradiation and Load Resistance

Sugathan¹,

Vijayan²

2015

IJAREEIE

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A fast-converging maximum power point tracking (MPPT) system is very essential for the photovoltaic (PV) system to ensure the rapid response with minimum power losses under fast-varying solar irradiation and load resistance. Traditionally, maximum power point (MPP) locus was used to provide such a fast response. However, the algorithm requires extra control loop or intermittent disconnection of the PV module. Hence, this paper proposes a simpler fast-converging MPPT technique, which excludes the extra control loop and intermittent disconnection. In the proposed algorithm, the relationship between the load line and the I-V curve is used with trigonometry rule to obtain the fast response. Results of the simulation and experiment using Modified SEPIC converter(which provide more static gain than simple SEPIC converter) showed that the response of the proposed algorithm is four times faster than the conventional incremental conductance algorithm during the load and solar irradiation variation. Consequently, the proposed algorithm has higher efficiency. KEYWORDS:. Fast converging, incremental conductance, maximum power point tracking (MPPT), photovoltaic (PV) system, Modified SEPIC. I.INTRODUCTIONSolar energy is gaining popularity in the field of electricity generation. The advantages of solar power, such as no air pollution, no fuel costs, noiseless, and low maintenance, have boosted the demand on this type of energy However; the high expense in acquiring the photovoltaic (PV) module has slowed down the adoption of PV system in electricity generation. Furthermore, the power of PV modules is unstable and strongly dependent on solar irradiation and load. Hence, the maximum power point tracking (MPPT) controller is introduced to ensure the PV system always provide high efficiency despite the variation in solar irradiation and load resistance.Many MPPT algorithms have been introduced to improve the efficiency of the PV system, including fractional open circuit voltage, fractional short circuit current, fuzzy logic, neural network, hill climbing or perturbation and observation (P&O), and incremental conductance. Among those algorithms, P&O and incremental conductance are the most popular algorithms. If a dc-dc converter is connected in between the PV module and the load, the switching duty cycle of the dc-dc converter is regulated to ensure the PV system always operates at the maximum power point (MPP) . For P&O, the power of the PV module is determined, and then the duty cycle of the converter is either increased or decreased to achieve the MPP. Generally, the perturbation keeps going in both directions near the MPP, and thus, oscillations occur in the power of PV module. Unlike P&O, the slope of the power-against-voltage (P-V ) curve of PV module is used by the incremental conductance algorithm to vary the duty cycle of the converter .By varying the duty cycle of the converter, the voltage of the PV module is able to be increased or decreased and thus the PV system is able to operate at the peak of the P-V cu...

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“…The power electronic converter must track the MPP of the PV cell [24][25][26] without modifying the mains voltage and frequency [13][14][15]. The conversion stage can be subdivided on the basis of the number of conversion stages (single or double) and on the basis of topology (e.g., centralized, string, modular, distributed).…”

Section: Pv Solar Array Configurationsmentioning

confidence: 99%

Transient Analysis of Large Scale PV Systems with Floating DC Section

et al. 2012

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Abstract:The increasing penetration of renewable sources with power-electronic interfaces in power systems is raising technical problems and the overall efficiency of photovoltaic systems can decrease dramatically. In this context, the optimal layout for the photovoltaic system is required. The most adequate strategy to connect the renewable system to the electrical power grid or to supply the end users must be adopted. The present paper proposes a design layout of a PV plant using a DC bus system to improve the overall energy conversion efficiency. An analysis of steady-state system stability, voltage drop and DC cable conduction losses is conducted. The leakage currents to the ground are investigated through simulations. Experimental results are shown focused on the analysis of optimal layout of photovoltaic systems under particular operating conditions.

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Control Issues in Single-Stage Photovoltaic Systems: MPPT, Current and Voltage Control

Cited by 280 publications

References 66 publications

A Coordinated Control for Photovoltaic Generators and Energy Storages in Low-Voltage AC/DC Hybrid Microgrids under Islanded Mode

A Coordinated Control for Photovoltaic Generators and Energy Storages in Low-Voltage AC/DC Hybrid Microgrids under Islanded Mode

A Fast-Converging MPPT Technique for Photovoltaic System with Modified SEPIC Converter under Fast- Varying Solar Irradiation and Load Resistance

Transient Analysis of Large Scale PV Systems with Floating DC Section

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