Power Flow Control using a Bidirectional Z-source Inverter–based Static Synchronous Series Compensator

The Static Synchronous Series Compensator, performing power control and reactive power compensation, is an important aid to stable and flexible operation of recent electrical power distribution networks. The paper describes a compensator based on a bidirectional Z-source inverter with PWM technology. This inverter has a wide control range and does not require a switching dead time. Its design using small signal theory to obtain suitable L-C network parameters for desired time response is described. Model predictive current control and direct current control schemes are analysed and compared, and satisfactory performance of the whole compensator is demonstrated.