Problem 1 (25 points): The dc-dc converter shown below inter…
Problem 1 (25 points): The dc-dc converter shown below interfaces a PV array (modeled as an ideal voltage source) to a resistive load of 50 ohms. The turns-ratio of the transformer is 1:1.2. The transformer primary voltage waveform is given below, using which all the operating conditions can be determined. (a) Calculate the power drawn from the PV array (b) Calculate the input voltage, Vin (c) Calculate the peak-peak ripple in the inductor current (d) Draw the following four waveforms in steady state over 10 us where is the voltage across the input inductor.
Read DetailsProblem 3 (25 points): The dc link voltage of a two-pole dc-…
Problem 3 (25 points): The dc link voltage of a two-pole dc-ac, 4 kW single phase PV inverter is 400 V. The inverter with a single L filter with L = 2 mH is connected to a single-phase grid at 240 V RMS and 60 Hz. The switching frequency is 20 kHz. The resistance of the filter inductor may be neglected. (a) Corresponding to the above value of L and the given dc link and grid voltages, design a proportional-resonant (PR) controller with a bandwidth of 1 kHz. Show the block diagram of the current loop and all the steps. (b) Calculate the THD in the line current corresponding to the given parameters. You may assume the modulation index ma to be the ratio of the peak grid voltage to the dc link voltage.
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