Cascaded Packed U-Cell STATCOM With Low Capacitance And Its Third Harmonic Control

Fast and safe control of low-capacitance static compensators with enhanced inductive operation

“…The proposed approach takes into account the inherent induced oscillation on the capacitor voltages. Unlike [82],…”

“…Utilising the flexibilities of a three-phase system with the purpose of increasing the operation range to full inductive mode was explored in [82], which is an extension of [83]. In both references, a third-harmonic zero-sequence voltage was added to the three ac-side converter voltages of an LC-StatCom with star configuration ( [82] was focusing on the inductive operation, whereas [83] was enhancing the capacitive operation).…”

“…Utilising the flexibilities of a three-phase system with the purpose of increasing the operation range to full inductive mode was explored in [82], which is an extension of [83]. In both references, a third-harmonic zero-sequence voltage was added to the three ac-side converter voltages of an LC-StatCom with star configuration ( [82] was focusing on the inductive operation, whereas [83] was enhancing the capacitive operation). Specifically, [82] presents a method to derive the optimal value of the third-harmonic zero-sequence voltage that minimises the average value of the voltages in the capacitors, which in turn reduces the switching losses, while preventing overmodulation.…”