Nonlinear control of standalone inverter with unbalanced, nonlinear load

Mohebbi, Mohammad; McIntyre, Michael L.; Latham, Joseph; Rivera, Pablo R.

doi:10.1109/peci.2017.7935731

Cited by 11 publications

(7 citation statements)

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“…where and are the series equivalent resistance and inductance of the output filter and the grid impedance respectively, is the capacitance of the DC link, ( ) is the grid voltage, ( ) is the inverter output current, ( ) and ( ) are the PV voltage and current, ( ) is the duty ratio control signal, and 0 represents the unknown disturbances, which could appear physically in the circuit such as imperfect switch timing [41].…”

Section: Simulation Results Of the Single-phase Pv Systemmentioning

confidence: 99%

“…Then, the method proposed in [46] is adopted in this dissertation to obtain the model of the single-phase system in dq frame. Additionally, based on the preceded work, the nonlinear controller is combined with adaptive control to adaptively estimate the unknown disturbances that physically appear in the circuit such as imperfect switching timing [41]. …”

Section: List Of Tablesmentioning

confidence: 99%

“…Since these nonlinearities could negatively affect the performance of the system if they are not adequately compensated for, new control solutions have been proposed using advanced nonlinear control techniques such as feedback linearization, sliding-mode control, and backstepping control. The backstepping control technique has shown good tracking performance, stability and system dynamics in standalone inverters [41].…”

Section: Control System For Grid-connected Pv Systemsmentioning

confidence: 99%

“…are slowly time-varying disturbances [41], the time derivative of Eq. (7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) and Eq.…”

Section: Stability Analysismentioning

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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Section: Simulation Results Of the Single-phase Pv Systemmentioning

confidence: 99%

Section: List Of Tablesmentioning

confidence: 99%

Section: Control System For Grid-connected Pv Systemsmentioning

confidence: 99%

“…are slowly time-varying disturbances [41], the time derivative of Eq. (7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) and Eq.…”

Section: Stability Analysismentioning

confidence: 99%

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Grid-connected photovoltaic systems based on nonlinear control.

Rivera¹

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“…In this chapter a backstepping controller developed in 0-frame is proposed for the control of a 3-phase 4-wire diode clamped inverter with output filter under different loads including balanced, unbalanced, linear and nonlinear loads [64]. In addition, an observer is developed for load-current estimation, enhancing the behavior of the proposed controller especially for the cases that there is a need to remove the costly output current sensor.…”

Section: Backstepping Controller For 3-phase Inverter With Seamless Tmentioning

confidence: 99%

Control of power electronic interfaces in distributed generation.

Mohebbi¹

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Improvement of the power quality of single‐phase grid‐connected inverter by filter‐based control scheme

Alqatamin

McIntyre

2020

IET Power Electronics

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In this study, a filter-based control scheme is developed for a single-phase grid-connected inverter system with the local load. Improving the quality of the local load voltage in the grid-connected mode and injecting clean current to the grid at the same time is the main objective of the proposed scheme. Moreover, unity power factor at the grid side for different types of the local load is ensured by the proposed controller. Furthermore, this control approach ensures the seamless transfer between grid-connected and stand-alone operation modes without adjusting the controller structure and without any resynchronisation scheme. The proposed scheme is validated by the Lyapunov stability analysis. Moreover, an experimental testbed has been implemented to further validate the controller in the real-time environment, as well as, the performance is compared to a conventional approach.

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Nonlinear control of standalone inverter with unbalanced, nonlinear load

Cited by 11 publications

References 0 publications

Grid-connected photovoltaic systems based on nonlinear control.

Grid-connected photovoltaic systems based on nonlinear control.

Control of power electronic interfaces in distributed generation.

Improvement of the power quality of single‐phase grid‐connected inverter by filter‐based control scheme

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