Research on Discretization PI Control Technology of Single-Phase Grid-Connected Inverter with LCL Filter

<table class="table-group" width="800px"><tr class="fig-image" id="a"><td><img alt="129619.fig.008a" src="https://static.hindawi.com/articles/mpe/volume-2014/129619/figures/129619.fig.008a.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(a) </b>Without limit of output voltage</td></tr></table></td></tr><tr class="fig-image" id="b"><td><img alt="129619.fig.008b" src="https://static.hindawi.com/articles/mpe/volume-2014/129619/figures/129619.fig.008b.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(b) </b>380 V limiter of output voltage</td></tr></table></td></tr><tr class="fig-image" id="c"><td><img alt="129619.fig.008c" src="https://static.hindawi.com/articles/mpe/volume-2014/129619/figures/129619.fig.008c.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(c) </b>Output voltage with PWM waveform of bipolar modulation</td></tr></table></td></tr><tr class="fig-image" id="d"><td><img alt="129619.fig.008d" src="https://static.hindawi.com/articles/mpe/volume-2014/129619/figures/129619.fig.008d.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(d) </b>Steady-state waveform zoom of (c)</td></tr></table></td></tr><tr class="fig-image" id="e"><td><img alt="129619.fig.008e" src="https://static.hindawi.com/articles/mpe/volume-2014/129619/figures/129619.fig.008e.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(e) </b>Output voltage with sampling frequency within unstable region</td></tr></table></td></tr></table>

Mathematical Problems in Engineering

fig8

Figure 8

Figure 8: Research on Discretization PI Control Technology of Single-Phase Grid-Connected Inverter with LCL Filter 