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.

40 Reads
  • Source
    • "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. "
    [Show abstract] [Hide abstract]
    ABSTRACT: A new scheme for nine-level voltage space-vector generation for medium-voltage induction motor (IM) drives with open-end stator winding is presented in this paper. The proposed nine-level power converter topology consists of two conventional three-phase two-level voltage source inverters powered by isolated dc sources and six floating-capacitor-connected H-bridges. The H-bridge capacitor voltages are effectively maintained at the required asymmetrical levels by employing a space vector modulation (SVPWM) based control strategy. An interesting feature of this topology is its ability to function in five- or three-level mode, in the entire modulation range, at full-power rating, in the event of any failure in the H -bridges. This feature significantly improves the reliability of the proposed drive system. Each leg of the three-phase two-level inverters used in this topology switches only for a half cycle of the reference voltage waveform. Hence, the effective switching frequency is reduced by half, resulting in switching loss reduction in high-voltage devices. The transient as well as the steady-state performance of the proposed nine-level inverter-fed IM drive system is experimentally verified in the entire modulation range including the overmodulation region.
    IEEE Transactions on Industrial Electronics 09/2013; 60(9):3627-3636. DOI:10.1109/TIE.2012.2207654 · 6.50 Impact Factor
  • Source
    • "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. "
    [Show abstract] [Hide abstract]
    ABSTRACT: This paper presents an effective hybrid optimal modulation technique for a cascaded H-bridge (CHB) multilevel inverter. The introduced method is generalized optimal pulsewidth modulation, which can be extended to any m-level CHB multilevel inverter operating at any switching frequency. The presented hybrid optimal modulation strategy includes the pattern exchange and optimal modulation techniques. In the optimal modulation technique, the hybrid interior-point algorithm, which is more flexible and efficient than conventional optimization techniques, is applied. The proposed hybrid optimal modulation strategy yields balanced units' output fundamental voltages, and low total harmonic distortion without the need for additional stabilizers. The performance of the proposed modulation strategy is verified by simulation studies and experimental results using a five-level CHB single-phase multilevel inverter.
    IEEE Transactions on Power Delivery 09/2012; 27(4):2150 - 2158. DOI:10.1109/TPWRD.2012.2205277 · 1.73 Impact Factor
  • Source

Show more


40 Reads
Available from