<ol><li>A 1-Φ full-bridge inverter with unipolar sinusoidal PWM is used to connect a PV system to the
grid operating at 60Hz. Assume the inverter (fundamental) voltage amplitude must follow the grid voltage amplitude exactly. If the RMS value of the grid voltage can vary within 10% of 120V, and the amplitude modulation index is between 0.2 and 0.8, then: (3*2 + 4 + 10 = 20 pts)</li><li>a) What are the minimum and maximum values the DC link voltage <em>V d </em>can be?</li><li>b) Pick a suitable frequency modulation index so the switching frequency is between 1 and 5 kHz.</li><li>Explain your choice clearly.</li><li>c) Suppose that <em>Vd</em>400<em>V</em>,and <em>vgrid</em>,<em>RMS</em>120<em>V</em>. The inverter is connected to a series RL load with</li><li><em>R </em>= 5Ω and <em>L </em>= 10mH. What is the largest the ratio <em>I A</em><em>h</em>,<em>RMS </em>can be, using table 8.1</li></ol>
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