I've just finished a university course with this book as the reference, and it's not been a happy experience. The author has a poor grasp of the concept of grammar-checking, and doesn't follow his own standards (sometimes including the imaginary "i"/"j" in formulas and sometimes leaving it out).
But the biggest problem is, the author makes no attempt to get the reader/student to understand WHY and HOW machine behavior is derived. Instead of deriving any equations (via KCL/KVL), PC Sen lists the equations as-is and expects you to memorize them.
Unfortunately, this is an engineering course and not English Lit: engineers need explanations and mathematics, not a "plug the variable in here and substitute to determine the answer" book.
Throughout the course the professor would have to point out inconstencies in the formulas provided and direct students to alternative online references as a substitute for this poor book's pitiful attempt at explaining power electronics to readers.