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

ABSTRACT 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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    • "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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    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
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    ABSTRACT: In this paper, the control strategy for the static synchronous compensator (STATCOM) used in utility distribution systems is investigated, and a novel fuzzy-PI-based direct-output-voltage (DOV) control strategy is presented. Based on power balancing principle and feedforward decoupling control, this novel DOV control strategy cannot only reduce the active and reactive current control loops of a conventional double-loop control strategy but also achieve the decoupling control to regulate dc-link voltage and maintain the voltages at the point of common coupling (PCC). In order to effectively improve the immunity capability of this novel DOV control strategy to the uncertainties in system parameters, two fuzzy PI controllers are separately employed to maintain the voltages at the PCC and to simultaneously regulate dc-link voltage. The validity and effectiveness of this novel control strategy for the STATCOM used in utility distribution systems have been verified by simulation results, and a scaled physical prototype rated at plusmn300 kVAr is also developed to test the STATCOM system.
    IEEE Transactions on Industrial Electronics 08/2009; 56(7-56):2401 - 2411. DOI:10.1109/TIE.2009.2021172 · 6.50 Impact Factor
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