A novel DC voltage detection technique in the CHB inverter-based STATCOM

Heilongjiang Univ. of Sci. & Technol., Harbin
IEEE Transactions on Power Delivery (Impact Factor: 1.73). 08/2008; 23(3):1613 - 1619. DOI: 10.1109/TPWRD.2008.919251
Source: IEEE Xplore


A novel dc voltage detection technique, referred to as single multiple-voltage (SMV) detector, is developed to obtain dc capacitor voltages in the cascaded H-bridge (CHB) multilevel inverter-based static synchronous compensator (STATCOM). Based on the proposed SMV algorithm, the number of voltage sensors is substantially reduced. Only three voltage sensors are required to obtain dc capacitor voltages from the inverter output voltage. The paper also presents a new dc voltage balance control method that combines the phase shifting technique and sinusoidal pulsewidth modulation (SPWM) strategy for the control of H-bridge dc capacitor voltages. The performance of CHB inverter- based STATCOM system, the accuracy of the developed SMV detector and the effectiveness of the proposed dc voltage balance control are verified by simulations in Simulink environment and experiments based on the dSPACE prototype system.

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    • "The major limitation of this topology is the requirement of multiple DC voltage sources, as each H-bridge cell requires a DC source. This topology is considered well suited for applications like PV systems, where obtaining multiple DC sources is not a constraint or applications without active power conversion, like STATCOM [11] -[12]. However, when conversion of real power is required, the difficulty in obtaining so many DC sources may preclude the use of the CHB inverters, in many applications. "
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    • "Various optimization algorithms are proposed to balance units' output fundamental voltages [7] and dc capacitor voltages [8] as well as lowering total harmonic distortion (THD) [9]. One technique is proposed in [5], which uses a combination of the phase-shifting technique and sinusoidal pulsewidth-modulation (SPWM) strategy, to control the H-bridge dc voltages. "
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