Patent ID: 9712048
Date: 2017-07-18
CPC Classifications: G01R,H02J,H02M,Y02E

Claim:
1. A method for conducting passive power factor compensation based on differential capacitor change, comprising: a. acquiring real time electrical power circuit measurements comprising: power factor, line voltage, line frequency, reactive power, and sign of reactive power; b. determining a compensation capacitance required; c. determining the states of each of capacitor switches for engaging or disengaging their corresponding capacitors for achieving a total capacitance closest to the compensation capacitance required; d. forming a new capacitor combination according the states of each of the capacitor switches determined for the compensation capacitance required; e. first disengaging currently engaged capacitors in current capacitor combination one by one in ascending order starting with the capacitor with lowest capacitance and ending with the capacitor with highest capacitance, and after all capacitors are disengaged, engaging capacitors in the new capacitor combination one by one in ascending order starting with the capacitor with lowest capacitance and ending with the capacitor with highest capacitance to minimize line transient noise; and repeating above steps a-e every pre-determined time interval.