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In three-phase grid-tied inverter, grid voltage feedforward is helpful to improve grid-tied power quality for strong grid condition. This paper found that the voltage feedforward had different effect on power quality under weak grid condition compared with that in ideal grid condition. And recent reported studies show that grid voltage feedforward has negative effect for grid-inverter system stability...
As a basic building block, the phase-locked loop (PLL) has been widely used in the grid-connected voltage source inverter (VSI). But it has been shown recently that PLL has adverse impact on stability of grid-inverter system. In a weak grid, the PLL may cause unexpected harmonic, or even instability. In order to overcome this problem, this paper proposes a q-axis voltage feedforward control method...
Phase locked loop (PLL) and Park transformation largely affects the stability of a grid-inverter system. Impedance-based approach is employed to analyze the effect of PLL to stability in this paper. Self-admittance and accompanying admittances are set up to represent the inverter including the PLL effect, and Nyquist criterion is employed to analyze the system stability. An asymmetric current control...
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