Question 109Electricity & Electronics - 1st Asst/Chief

The correct answer is D) provide reactive power to the mains as the frequency converter has the ability to provide only active power. The purpose of the synchronous compensator, as shown in figure "B" of the illustration, is to provide reactive power to the mains. This is because the frequency converter in this system is designed to only provide active power, and the mains requires both active and reactive power for proper operation. The synchronous compensator compensates for the reactive power that the frequency converter cannot provide, ensuring the mains receives the necessary reactive power. The other answer choices are incorrect because they do not accurately describe the purpose of the synchronous compensator in this system. The frequency converter is not limited in its ability to provide active power, and the synchronous compensator is not meant to provide additional active power beyond the converter's capabilities.