Abstract

The performance of digitally controlled gridconnected power converters depends to a large extent on the synchronization strategy. Single-phase phase locked loops (PLL) with a second-order generalized integrator (SOGI) as quadrature signal generation subsystem provide proper grid synchronization in the case of harmonically distorted grid voltage. The SOGI-PLL transient performance can be improved by replacing the PLL by a frequency locked loop (FLL). However, compared with SOGI-PLLs, SOGI-FLLs perform poorly in steady-state. This work proposes to include a secondary control path (SCP) to improve the dynamics of SOGIPLLs, while maintaining the steady-state performance. Simulation and experimental results are provided to validate the proposal.

Highlights

  • Synchronization strategies play a key role in digital controllers used in grid-connected power converters [1]

  • In order to improve the dynamics of the second-order generalized integrator (SOGI)-phase locked loops (PLL) this paper proposes to include a secondary control path (SCP) within the SOGI-PLL structure to balance the transient and steady-state performances

  • The proposed SOGI-PLL with SCP is obtained by replacing the PI controller in Fig. 1.a by the configuration shown in Fig. 1.c, which consists of a frequency feedback (FFB) loop applied to the PI controller of the PLL

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Summary

INTRODUCTION

Synchronization strategies play a key role in digital controllers used in grid-connected power converters [1]. Among other well stablished synchronization strategies in 1φ grid-connected power converters, those based on secondorder generalized integrators (SOGIs) are effective solutions [6]–[11]. The grid voltage harmonics are filtered out by the SOGI and it provides the inquadrature signal. When embedded within the 1φ PLL, the resonant frequency of the SOGI is provided by the loop filter, typically a PI controller (Fig. 1.a). In order to speed up the dynamics of the SOGI-PLL, the phase detector, the loop filter and the controlled oscillator can be replaced by a frequency locked loop (FLL), resulting in a SOGI-FLL [12].

SOGI-PLL WITH SCP
SIMULATION RESULTS
EXPERIMENTAL RESULTS
CONCLUSIONS
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