Derivation of instantaneous current references for three phase PV inverter connected to grid with active and reactive power flow control

In this paper, inverter reference current generation for a three phase grid connected PV inverter under generalized grid voltage conditions is proposed. The proposed method facilitates high bandwidth grid active and reactive power flow control along with min- imum DC link ripples with grid current THD control facility by finding suitable current reference directly in the a-b-c frame. The proposed method is much faster than the conventional methods because of the absence of phase lock loop (PLL) and Park's transformation requirements. The proposed method is also independent of grid voltage fundamental frequency and capable of rejecting the grid voltage harmonics. These advantages make it more suitable for micro-grid applications. The proposed method is validated with rigorous experiments and test results presented depict the efficacy of the proposed system.

...A detailed literature survey on the power control methodologies of the three phase grid connected PV inverter system is reported in [3]...
...It has been reported that high band-width grid active and reactive power control is facilitated by directly controlling the currents of the CCVSI system [3]...
...The proposed control method uses the current references calculated by the method described in [3] and the successful current tracking by the CCVSI ensures proper grid active and reactive power flow along with minimum DC link side ripple and pure sinusoidal grid currents...
...The functional details of the schematic is discussed in [3]...
...The proposed control system along with the current reference calculator (as described in [3]) are implemented using dSPACE card dS1104...
...The current reference generation method is analyzed in details in [3]...
...As per the estimator discussed in [3], for the CCVSI currents(which is also the negative grid currents) phase-a assumes the peak value of about 2.2 A and phase-b and c assume the peak value about 3.1 A and the specific relative phases as can be supported by Figure 6(b)...
...However, the grid current reference is derived using the fundamental grid phase utilizing an alternative approach as discussed in [3] to ensure desired grid active and reactive power flow...

Keywords (5)

Derivation of instantaneous current references for three phase PV inverter connected to grid with active and reactive power flow control,10.1109/ICPE.

Citation Context (1)

S. Dasgupta, et al. A Lyapunov function based current controller to control active and rea...

References (12)

Power-Electronic Systems for the Grid Integration of Renewable Energy Sources: A Survey (Citations: 381)

Power flow control of a distributed generation unit in micro-grid (Citations: 4)

Analysis of the Instantaneous Power Flow for Three-Phase PWM Boost Rectifier Under Unbalanced Supply Voltage Conditions (Citations: 18)

Regulation of a PWM rectifier in the unbalanced network state using a generalized model (Citations: 103)

Flexible Active Power Control of Distributed Power Generation Systems During Grid Faults (Citations: 62)

Citations (1)

A Lyapunov function based current controller to control active and reactive power flow in a three phase grid connected PV inverter under generalized grid voltage conditions (Citations: 1)


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