Energy conversion unit having cascaded synchronous static var compensator topology and control method

Energy conversion unit having cascaded synchronous static var compensator topology and control method, cascade involving reactive power compensation apparatus capacitor voltage power balance control unit art, the present invention is to solve the conventional star connection converter cascade for the method of changing the present inverter output current phase and voltage phase unbalance capacitor employed, the reliability of the control destruction, there is a low-pass filter to extract the positive and negative sequence components, the problem of dynamic performance STATCOM cascading impact. The present invention is cascaded static var compensator synchronization topology comprising a power module of N-1, N being a positive integer, N-1 power modules in a star connection; N-th power module using the energy exchange unit EEU, energy exchange EEU star point connection means and the energy exchange unit EEU comprises a common three-phase bridge and two capacitors, and two three-phase bridge common capacitor with a star connection. The present invention for reactive power compensation device based on the power unit of the cascade.