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

ArticleinIEEE Transactions on Power Delivery 23(3):1613 - 1619 · August 2008with50 Reads
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.
    • "This dc voltage balancing can be achieved by creating a phase shift between converter output voltage and network voltage to compensate the internal losses associated with CMI. By changing the active power input to the each H bridge of STATCOM, dc voltage balancing can be achieved [6]. The measured dc voltage of individual H bridge is compared with reference dc voltage and passed through the PI controller to generate error signal to make a dc voltage phenomena in a system as shown in Fig. 2. The cluster voltage balancing control forces the average value of each cluster (i.e. , , ) to follow overall average DC voltage as shown in Fig. 2. "
    [Show abstract] [Hide abstract] ABSTRACT: Abstract—Cascade multilevel inverter is the best suitable topology among the other multilevel inverter topologies in STATCOM application due to its distinguished featuring like modularity in structure and feasibility in control design in terms of less switching losses and better ac output waveform quality. DC voltage balancing and reactive power compensation at the point of common coupling are the challenging issues which may enhance the system superiority. In this paper special attention is dedicated to increase the reliability of the system by presenting the general control design for the system by which dc link voltage balancing and reactive power compensation can be carried out by using the nine-level cascade multilevel inverter as STATCOM. Computer based simulation result has been carried out to verify the superiority of the system at different load conditions and faulty condition.
    Full-text · Conference Paper · Jul 2016
    • "This dc voltage balancing can be achieved by creating a phase shift between converter output voltage and network voltage to compensate the internal losses associated with CMI. By changing the active power input to the each H bridge of STATCOM, dc voltage balancing can be achieved [6]. The measured dc voltage of individual H bridge is compared with reference dc voltage and passed through the PI controller to generate error signal to make a dc voltage phenomena in a system as shown in Fig. 2. The cluster voltage balancing control forces the average value of each cluster (i.e. , , ) to follow overall average DC voltage as shown in Fig. 2. "
    [Show abstract] [Hide abstract] ABSTRACT: Cascade multilevel inverter is the best suitable topology among the other multilevel inverter topologies in STATCOM application due to its distinguished featuring like modularity in structure and feasibility in control design in terms of less switching losses and better ac output waveform quality. DC voltage balancing and reactive power compensation at the point of common coupling are the challenging issues which may enhance the system superiority. In this paper special attention is dedicated to increase the reliability of the system by presenting the general control design for the system by which dc link voltage balancing and reactive power compensation can be carried out by using the nine-level cascade multilevel inverter as STATCOM. Computer based simulation result has been carried out to verify the superiority of the system at different load conditions and faulty condition.
    Full-text · Conference Paper · Jul 2016
    • "The literature [4] based on hierarchical control, realize the voltage balance through active power voltage vector superposition method, the good control characteristics, parameter design is simple, the DC capacitor voltage consistent good. The literature [5, 6] through the phase change of each unit of angle of the inverter to achieve voltage balancing, but for large capacity inverter, the phase shift angle adjustable range is small, change the phase angle is easy to cause system instability. Literature [7] presented an independent voltage balancing strategy to achieve voltage balancing, sine the methods need to be divided by the current value of the phase, but the sine value zero value is too small, the system is more sensitive to perturbations becomes. "
    Conference Paper · Jan 2014
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