Build a switching plecs model of the system

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Reference no: EM133419540

Question 1. Build a switching Plecs model of the system, including the PWM modulator and the full-bridge converter. Use a DC source power supply. Feed the PWM modulator with the voltage demand calculated in 1.2 and demonstrate that the correct average power is exchanged with the AC grid. This should match with the one from 1.2 and 1.3 Hint: Make sure the full-bridge is built as the combination of two half-bridges with independent PWM modulators, as discussed during lectures

Question 2. In 1, show that the average over a switching period of the voltage generated by the full-bridge matches the voltage demand provided to the PWM modulator. In addition, show the Fourier spectrum of the generated voltage and discuss it

Question 3. From the same switching simulation, demonstrate that the design of L is correct, showing that the current ripple is always below the maximum value

Question 4. Implement the controller designed in the continuous time domain in the switching Plecs model. Provide an AC current reference that enables the exchange of a desired active power and zero reactive power. Show that the close loop control can follow the current reference in steady state, commenting on any discrepancies you find. In addition, show the response of the system to the following transients: case A) power step from 0 to P/2 and from P/2 to P and case B) power step from 0 to - P/2 and from -P/2 to -P and discuss how it relates with the expected closed loop performances. Hint: make sure you design a simple block the receives the desired AC power reference and generates the required AC current reference Repeat the same task using a digital implementation in the z-domain with sampling Rate fs= fSW (ωS=2*π*fSW rad/s) and using the same specifications as in the continuous case.

Question 5. Keeping everything you have done in the simulation model for 1, replace the DC source with the calculated capacitor with a controllable current source in parallel, representing the current coming from the photovoltaic / energy storage system. Set the value of the DC current to zero and implement the DC voltage controller in the continuous time domain. Run the simulation and verify that the DC voltage reaches steady state at the desired value.

Question 6. Run again the simulation in 5 but during the simulation increase the DC current from 0 to half the rated current first and then from half the rated current to the full rated current. Show the transient response of the DC voltage and compare it with the transient you expected from control design.

Question 7. When operating at full DC current, the system is injecting rated power in the AC grid. Demonstrate that in these conditions the DC voltage ripple respects the system specifications

Reference no: EM133419540

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