Hi there, I have a system that trace every 10ms the voltage of the dc link and in parallel there are capacitors on the DC Link that is about 100 F. The DC Link Voltage can raise as high as 300VDC and it fluctuates. (I am just throwing out numbers as I'm just trying to grasp the concepts) To find the energy of the system I used 1/2 CV2 From the table here that I calculated. Would it be right to say : Energy At that Instant would be 1/2 CV2 Energy Consumed would be the positive value, and the negative values would mean there is excessive energy is returned back to the dc link? Hope someone could clarify this. Thanks!