TABLE OF CONTENTS We investigate the topic of STATCOM, titled Trinary Hybrid Multilevel Inverter Used in STATCOM with Unbalanced Voltages, in this section. A trinary hybrid multilevel inverter is applied Synchronous STATCOM with unbalanced voltages. Benefiting from trinary hybrid topology of the inverter, the cost of STATCOM is reduced because of not only fewer switching components but also of reduced cost of DC capacitors. The combination of vector control based on synchronous frame and staircase modulation is used in presented STATCOM system to regulate reactive power or balance bus voltages under balanced or unbalanced conditions. To achieve this control aim, a new method based on the comparison of reference amplitudes and reference signals is presented in this chapter. The performance of the proposed control strategy is confirmed by simulation and experiment.
Synchronous STATCOM is a FACTS device, which is connected as a shunt to the network, for generating or absorbing reactive power. STATCOM can be utilized to regulate voltage, control power factor and stabilize power flow [12]. Many inherent benefits of multilevel inverter have led to their increased interest in STATCOM. In Refs [13,14], cascade multilevel inverters have been used in STATCOM. Furthermore, the application of binary hybrid multilevel inverters in STATCOM has also been investigated because the binary hybrid multilevel inverter can generate more voltage levels than the cascade multilevel inverter with the same number of switches [15 17]. Recently, trinary hybrid multilevel inverter have been presented and attracted more interest since it is said that it can generate...
