Three-phase grid-connected of photovoltaic generator using nonlinear control

Yahya, Abdelhafid; Fadil, H. El; Guerrero, Josep M.; Giri, F.; Erguig, H.

doi:10.1109/cca.2014.6981447

Cited by 9 publications

(6 citation statements)

References 14 publications

(10 reference statements)

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“…An equivalent circuit for a PV cell as shown in Figure 2. Its current characteristic can be found in many places [10]- [13] and presents the following expression.…”

Section: Pv Array Modelmentioning

confidence: 99%

Output feedback nonlinear control of three-phase grid-connected PV generator

Yahya¹,

Fadil²,

Oulcaid³

2019

IJPEDS

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<span lang="EN-GB">This paper addresses the problem of controlling three-phase grid connected PV system involving a PV arrays, a voltage source inverter, a grid filter and an electric grid. This paper presents three main control objectives: i) ensuring the Maximum power point tracking (MPPT) in the side of PV panels, ii) guaranteeing a power factor unit in the side of the grid, iii) and ensuring the asymptotic stability of the closed loop system. Interestingly, the present study features the achievement of the above energetic goal without resorting to sensors of currents of the grid. To this end, an output-feedback control strategy combining a state observer and a nonlinear control laws is developed. The proposed output-feedback control strategy is backed by a formal analysis showing that all control objectives are actually achieved</span>

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“…An equivalent circuit for a PV cell as shown in Figure 2. Its current characteristic can be found in many places [10]- [13] and presents the following expression.…”

Section: Pv Array Modelmentioning

confidence: 99%

Output feedback nonlinear control of three-phase grid-connected PV generator

Yahya¹,

Fadil²,

Oulcaid³

2019

IJPEDS

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“…Recall that the control objective is to enforce the voltage x 1 to track the optimal point V m . To this end, the backstepping design technique is used [29][30][31][32][33][34]. Then the control design applies in a systematic way, in two steps.…”

Section: Controlling the Boost Converter To Meet Mpptmentioning

confidence: 99%

Control of Grid Connected Photovoltaic Systems with Microinverters: New Theoretical Design and Numerical Evaluation

Yahya

Fadil

Oulcaid

et al. 2017

Asian Journal of Control

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This paper addresses the problem of controlling grid connected photovoltaic (PV) systems that are driven with microinverters. The systems to be controlled consist of a solar panel, a boost dc–dc converter, a DC link capacitor, a single‐phase full‐bridge inverter, a filter inductor, and an isolation transformer. We seek controllers that are able to simultaneously achieve four control objectives, namely: (i) asymptotic stability of the closed loop control system; (ii) maximum power point tracking (MPPT) of the PV module; (iii) tight regulation of the DC bus voltage; and (iv) unity power factor (PF) in the grid. To achieve these objectives, a new multiloop nonlinear controller is designed using the backstepping design technique. A key feature of the control design is that it relies on an averaged nonlinear system model accounting, on the one hand, for the nonlinear dynamics of the underlying boost converter and inverter and, on the other, for the nonlinear characteristic of the PV panel. To achieve the MPPT objective, a power optimizer is designed that computes online the optimal PV panel voltage used as a reference signal by the PV voltage regulator. It is formally shown that the proposed controller meets all the objectives. This theoretical result is confirmed by numerical simulation tests.

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“…Since nonlinear controllers deal with nonlinearities directly [51], in the literature, there are some advanced and efficient nonlinear control techniques and schemes applied to grid-connected PV systems. Techniques such as backstepping control, sliding control, and feedback linearization, have been presented in [24]- [39]. Most of those studies involve the twostage topology either for three-phase or single-phase systems.…”

Section: List Of Tablesmentioning

confidence: 99%

“…In [38] is presented a new technique to achieve MPP using an optimal voltage reference generator, which voltage regulation involves the squared DC voltage. In [39], a single-stage three-phase gridconnected PV system using a Lyapunov-based nonlinear control to manage the active power is presented. The research presented in [39] does not take into account the voltage dynamics of the DC link capacitor, which includes nonlinearities due to the switching functions of the inverter.…”

Section: List Of Tablesmentioning

confidence: 99%

“…In [39], a single-stage three-phase gridconnected PV system using a Lyapunov-based nonlinear control to manage the active power is presented. The research presented in [39] does not take into account the voltage dynamics of the DC link capacitor, which includes nonlinearities due to the switching functions of the inverter. The voltage dynamics of the DC link capacitor could lead to oscillation of the DC link voltage or injection of non-sinusoidal current to the grid if they are not incorporated therefore affecting the efficiency and the power quality.…”

Section: List Of Tablesmentioning

confidence: 99%

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Grid-connected photovoltaic systems based on nonlinear control.

Rivera¹

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Solar energy, considered as abundant and clean renewable energy source, has been utilized for a variety of applications such as generation of electricity for low and medium power. Nowadays, due to the high-scale penetration of photovoltaic systems, reliable and efficient grid-connected photovoltaic (PV) systems using the advances of power electronics and control system technology are desirable. Thus, single-stage gridconnected photovoltaic systems, have gained attention, especially in low voltage applications. However, PV systems exhibit nonlinear behavior due to the intrinsic features of the PV cell and nonlinear switching functions of the inverter that could negatively affect the performance of the system if they are not adequately compensated for. In this dissertation, using the general structure for the synchronous dq0 frame, a single-stage three-phase grid-connected photovoltaic inverter with a nonlinear control strategy is developed to track the maximum power regardless of the atmospheric conditions and to control the active and reactive power without the necessity of an additional power converter. A novel trajectory of the reference current is obtained online taking into account the dynamics of the DC link capacitor and the switching function of the inverter. v Furthermore, due to increased penetration of low-power single-phase PV systems in residential applications, a single-stage single-phase grid-connected PV system with a nonlinear control strategy is proposed in this dissertation. Unlike to the three-phase system, the single-phase system includes a novel method to mitigate the double linefrequency current ripple of the PV array, which is the major drawback of the single-phase PV inverter. Moreover, based on the preceded work, the nonlinear controller is combined with adaptive control to estimate the unknown disturbances that physically could appear in the circuit and affect the performance of the system. Additionally, in this study, the stability of the system and boundedness of signals of the closed-loop system are demonstrated by Lyapunov stability analysis for both the three-phase system and the single-phase system respectively. Simulation results show the effectiveness and robustness of the proposed controllers to track the maximum power and to control the active and reactive power to sudden changes in the atmospheric conditions and changes in the load.

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Three-phase grid-connected of photovoltaic generator using nonlinear control

Cited by 9 publications

References 14 publications

Output feedback nonlinear control of three-phase grid-connected PV generator

Output feedback nonlinear control of three-phase grid-connected PV generator

Control of Grid Connected Photovoltaic Systems with Microinverters: New Theoretical Design and Numerical Evaluation

Grid-connected photovoltaic systems based on nonlinear control.

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