Model-based generation of low distortion currents in grid-coupled PWM-inverters using an LCL output filter

Bolsens, B.; Brabandere, K. De; Keybus, Jeroen Van den; Driesen, Johan; Belmans, Ronnie

doi:10.1109/pesc.2004.1354816

Cited by 48 publications

(66 citation statements)

References 9 publications

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“…If this is indeed a coupling inductor the LC filter becomes a LCL filter. How to design the output filters is out of the scope of this paper; detailed analyses of these filters can be found in [25,26].…”

Section: State-space Model Of Lc Filter and Coupling Impedancementioning

confidence: 99%

State-space model of grid-connected inverters under current control mode

Kroutikova

Hernandez-Aramburo

Green

2007

IET Electr. Power Appl.

163

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The growth of distributed generation has led to distribution systems with a mixture of rotating machine generators and inverter interfaced generators. The stability of such networks needs to be studied through analysis of state-space models and so suitable models of inverters are needed to complement the well established models of rotating machines. Just as machine models include features such as automatic voltage regulators and wash-out functions so too should the inverter model include phase-locking functions and internal control loops.This paper develops the model for voltage source inverters with an internal current control loop, an outer power regulation loop, a measurement of average power and a phase-locked loop. The model is presented in detail and is formed with a state-vector similar to that used for rotating machines. The model includes non-linear terms but can be linearised about an operating point. The state-space model is verified against a component-level time-step simulation in Simulink/PLECS.

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Section: State-space Model Of Lc Filter and Coupling Impedancementioning

confidence: 99%

State-space model of grid-connected inverters under current control mode

Kroutikova

Hernandez-Aramburo

Green

2007

IET Electr. Power Appl.

163

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“…The aim of this control strategy is to generate inverter output current, i O , that is harmonic-free under all circumstances including, in particular, the case of the voltage at the point of the connection, v O being harmonically distorted, [7], [8]. Under such control, the inverter presents an infinite impedance to grid voltage harmonics and, provided the control is accurate, the inverter current will be harmonic free.…”

Section: Inverter Output Current Controlmentioning

confidence: 99%

“…Several existing applications have been reported including application of the method to active power filters and parallel connected inverters [4], [8], [14]. (17) and (18).…”

Section: Voltage and Current Observationmentioning

confidence: 99%

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Harmonic and reactive power compensation as ancillary services in inverter-based distributed generation

Prodanović

Brabandere

Keybus

et al. 2007

IET Gener. Transm. Distrib.

Self Cite

105

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Decomposition of observed voltages and currents into harmonic terms that are phasesynchronised to the grid voltage is a challenge in real-time systems. Kalman observers are used to achieve this with the additional advantage of avoiding explicit phase-locking while producing quadrature components useful in instantaneous calculation of reactive power and in providing feed-forward compensation terms.

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“…If the grid voltage is not measured, the synchronization can be based on: 1) control error (i c,ref − i c ) of current control [1]; 2) DC-link power balance [2]; 3) instantaneous power theory [3]; 4) duality between the grid-connected converter and the PWM inverter-fed electric motor [4,5]; 5) direct estimation [6,7]; or 6) adaptive model-based estimation [8]. The above-mentioned methods have been developed for a grid-connected converter using the conventional L filter, but in the case of the resonant LCL filter, only a few [9][10][11][12][13] grid-voltage sensorless synchronization methods exist.…”

Section: Introductionmentioning

confidence: 99%