Current control of voltage source converters connected to the grid through an LCL-filter

Bueno, Emilio; Espinosa, Felipe; Rodríguez, Francisco; Urefia, J.; Cobreces, Santiago

doi:10.1109/pesc.2004.1355715

Cited by 32 publications

(22 citation statements)

References 8 publications

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“…Ripples are created in the output currents of the inverter due to the high frequency commutation of the IGBTs, meanwhile the low order harmonics are produced by non-linear loads. The best solution for correcting the high frequency ripples is by using an LC or an LCL filter [29] in the ac side of the inverter, meanwhile the amplitude of the low order harmonic must also be attenuated to guarantee a good power quality injection to the utility grid, although this a difficult task except if a harmonic-compensator (HC) algorithm is used.…”

Section: Power Subsystemmentioning

confidence: 99%

Control and synchronization algorithms for a grid-connected photovoltaic system under harmonic distortions, frequency variations and unbalances

et al. 2015

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a b s t r a c tIn this paper, an implementation of the control and the synchronization algorithms for a Voltage Source Inverter used as the power conditioner for Photovoltaic renewable energy in a grid-connected structure is carried out. Its main purpose is to show, in a simple manner, the design and combined operation of the control and synchronization algorithms for attaining the proper behaviour of the Grid Inverter when the 3-phase utility grid is disturbed by voltage unbalances, frequency variations and harmonic distortions, according to power quality standards.In order to obtain a high efficiency of the system during perturbations, a Proportional Resonant controller with a Harmonic Compensator structure is designed for the control algorithm, whereas a Dual Second Order Generalized Integrator Frequency-Locked Loop (DSOGI-FLL) is used as the synchronization algorithm.In order to validate both the control and the synchronization algorithms, some simulations using MATLAB/SIMULINK from The MathWorks, Inc. are shown firstly, and secondly, some real-time digital simulations are carried out.

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Section: Power Subsystemmentioning

confidence: 99%

Control and synchronization algorithms for a grid-connected photovoltaic system under harmonic distortions, frequency variations and unbalances

et al. 2015

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“…Control systems for power systems [14] and specifically for voltage inverters usually use PI control [21], deadbeat control [11], or a combination of them [4], [20] delta modulation, hysteresis control [26], or even more complex multivariable feedback control [8], [16], [17], [27]. Most of the aforementioned control algorithms are performed in the phasor domain and use modulation techniques without optimality guarantees.…”

Section: Related Workmentioning

confidence: 99%

“…Control systems that measure less variables are being implemented with increased complexity. The variables that cannot be measured in the circuit, need to be identified with observers [3], [4]. The observers enter a delay in the system because of the increased calculations and complexity.…”

Section: Related Workmentioning

confidence: 99%

Online optimal switching of single phase DC/AC inverters using partial information

Vamvoudakis

Hespanha

2014

2014 American Control Conference

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This paper proposes an online optimal tracking algorithm to provide the desired voltage magnitude and frequency at the load. This eventually will work as a DC/AC inverter that with appropriate switching of semiconductor devices will convert low DC voltage to high AC voltage. An L´C filter is used to reduce the effects caused by switching semiconductor devices. The proposed control scheme ensures a good tracking of an exosystem that provides the desired voltage magnitude and frequency. It builds upon the ideas of approximate dynamic programming (ADP) and uses only partial information of the system and exosystem. A Lyapunov stability proof ensures that the closed-loop system is asympotically stable. Finally, simulations show the effectiveness of the proposed approach.Index Terms-Power systems, voltage source inverter, approximate dynamic programming.

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“…The use of anti-aliasing filters is a traditional solution in this problem, but the phase delay introduced in the signal affect negatively the robustness of the current control loop. In [10] a full order state estimator is proposed to eliminate the need of additional sensors on the system. This system was proved with temporal variations on the filter parameters and good results are obtained.…”

Section: Introductionmentioning

confidence: 99%

Multirate state estimator applied to the current control of PWM-VSI connected to the grid

Gabe

Pinheiro

2008

2008 34th Annual Conference of IEEE Industrial Electronics

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This paper proposes a multirate state estimator for grid connected PWM inverters with LCL-filter usually found in high power variable speed wind turbines. The proposed state estimator reduces significantly the high frequency components resulted from the PWM operation on the estimated state variables. Furthermore, the proposed multirate estimator does not introduce additional dynamics under nominal conditions and it is predictive. As a result, it can compensate the time delay of digital implementation and the closed loop system is robust for grid impedance uncertainties. It is demonstrated that even with constant feedback gains it is possible to ensure stable operation from stiff to weak grid conditions. Experimental results from a 10 kW grid connected inverter is presented to demonstrate the good performance of the closed loop system with the proposed multirate estimator.

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Current control of voltage source converters connected to the grid through an LCL-filter

Cited by 32 publications

References 8 publications

Control and synchronization algorithms for a grid-connected photovoltaic system under harmonic distortions, frequency variations and unbalances

Control and synchronization algorithms for a grid-connected photovoltaic system under harmonic distortions, frequency variations and unbalances

Online optimal switching of single phase DC/AC inverters using partial information

Multirate state estimator applied to the current control of PWM-VSI connected to the grid

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