Problem 4: (a) (13 points) Consider a 2-pole PMSM wind generator system delivering 2 MW with a rotor speed of 3000 RPM. Its parameters are . The d axis is aligned with the rotor position, which is given to be -900 at t = 0. The flux linkage in the d-axis winding due to the rotor magnets, . Assume kE = 1. Draw the per-phase equivalent circuit and calculate the phase ‘a’ current.   (b) (12 points) Briefly explain (a short paragraph or a few bullet points) each of the following. (1) Volt-VAR control and (2) Super-synchronous mode of operation in DFIG

Problem 1: (25 points) (a) Consider a three-phase, two-level converter with dc link voltage of 1000 V.  The CCA value of the line-line voltage generated by the converter is 480 V RMS at 60 Hz.  The switching frequency is 20 kHz. Using space vector PWM, plot the instantaneous for one switching period around t = 8 ms.  Clearly indicate the CCA value of each quantity also at 8 ms. (b) What is the maximum RMS line-line voltage that can be generated from the given 1000V dc link voltage using space vector PWM?

Name 3 OT-related goals associated with assistive technology. For each goal, give one example of assistive technology that an OT could recommend to achieve this goal.

List 2 functions of the skin in the human body.

  The splint pictured above has been fabricated for an individual with rheumatoid arthritis who is experiencing pain and instability in the 1st MCP joint. The splint prescription (referral) stated: Fabricate a wrist and 1st MCP immobilization splint. Both the wrist & 1st MCP are immobilized in the prescribed positions.  Explain 2 errors you see in the splint. 

At the end of your OT session, Rebecca reports increased pain throughout her ribs and legs where the acute fractures are. It has increased from a 7/10 to a 9/10. Which of the following would be most appropriate for the OT to do in order to help with Rebecca’s pain? 

Name 2 general strategies an OT may use to treat low vision. For each general strategy, give one example.

Wayfinding, urban versus rural, and weather are aspects of the ________________ that influence community mobility. 

List 2 OT goals associated with burn injuries. Goals can be from the acute, emergent, or rehabilitation phase.

Your homecare patient is post-myocardial infarction with CHF. He becomes SOB, fatigued, and his heart rate tends to increase beyond his recommended parameter while performing basic self-care activities, otherwise he has no mobility problems. In order to increase independence and safety in shower/bathing, you would recommend which of the following for use in the bathtub?