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www.projectsatbangalore.com 09591912372 IEEE TRANSACTIONS
ON POWER DELIVERY, VOL. 29, NO. 3, JUNE 2014 993 Cascaded Two-Level Inverter-Based Multilevel STATCOM for High-Power Applications N. N. V. Surendra Babu, Member, IEEE, and B. G. Fernandes, Member, IEEE Abstract—In this paper, a simple static var compensating scheme using a cascaded two-level inverter-based multilevel in- verter is proposed. The topology consists of two standard two-level inverters connected in cascade through open-end windings of a three-phase transformer. The dc-link voltages of the inverters are regulated at different levels to obtain four-level operation. The simulation study is carried out in MATLAB/SIMULINK to pre- dict the performance of the proposed scheme under balanced and unbalanced supply-voltage conditions. A laboratory prototype is developed to validate the simulation results. The control scheme is implemented using the TMS320F28335 digital signal processor. Further, stability behavior of the topology is investigated. The dynamic model is developed and transfer functions are derived. The system behavior is analyzed for various operating conditions. Index Terms—DC-link voltage balance, multilevel inverter, power quality (PQ), static compensator (STATCOM). I. INTRODUCTION THE application of flexible ac transmission systems (FACTS) controllers, such as static compensator (STATCOM) and static synchronous series compensator (SSSC), is increasing in power systems. This is due to their ability to stabilize the transmission systems and to improve power quality (PQ) in distribution systems. STATCOM is pop- ularly accepted as a reliable reactive power controller replacing conventional var compensators, such as the thyristor-switched capacitor (TSC) and thyristor-controlled reactor (TCR). This device provides reactive power compensation, active power oscillation damping, flicker attenuation, voltage regulation, etc. [1]. Generally, in high-power applications, var compensation is achieved using multilevel inverters [2]. These inverters consist of a large number of dc sources which are usually realized by capacitors. Hence, the converters draw a small amount of active power to maintain dc voltage of capacitors and to compensate the losses in the converter. However, due to mismatch in con- duction and switching losses of the switching devices, the ca- pacitors voltages are unbalanced. Balancing these voltages is a major research challenge in multilevel inverters. Various con- trol schemes using different topologies are reported in [3]–[7]. Among the three conventional multilevel inverter topologies, Manuscript received February 07, 2012; revised June 27, 2012, June 19, 2013, and October 02, 2013; accepted February 04, 2014. Date of publication March 04, 2014; date of current version May 20, 2014. Paper no. TPWRD-00127-2012. The authors are with the Electrical Engineering Department, Indian Institute of Technology Bombay, Mumbai, Maharashtra 400076, India (e-mail: suren- drababu.nukala@gmail.com; bgf@ee.iitb.ac.in). Digital Object Identifier 10.1109/TPWRD.2014.2305692 cascade H-bridge is the most popular for static var compensa- tion [5], [6]. However, the aforementioned topology requires a large number of dc capacitors. The control of individual dc-link voltage of the capacitors is difficult. Static var compensation by cascading conventional multi- level/two level inverters is an attractive solution for high-power applications. The topology consists of standard multilevel/two- level inverters connected in cascade through open-end wind- ings of a three-phase transformer. Such topologies are popular in high-power drives [8]. One of the advantages of this topology is that by maintaining asymmetric voltages at the dc links of the inverters, the number of levels in the output voltage waveform can be increased. This improves PQ [8]. Therefore, overall con- trol is simple compared to conventional multilevel inverters. Various var compensation schemes based on this topology are reported in [10]–[12]. In [10], a three-level inverter and two- level inverter are connected on either side of the transformer low-voltage winding. The dc-link voltages are maintained by separate converters. In [11], three-level operation is obtained by using standard two-level inverters. The dc-link voltage balance between the inverters is affected by the reactive power supplied to the grid. In this paper, a static var compensation scheme is proposed for a cascaded two-level inverter-based multilevel inverter. The topology uses standard two-level inverters to achieve multilevel operation. The dc-link voltages of the inverters are regulated at asymmetrical levels to obtain four-level operation. To verify the efficacy of the proposed control strategy, the simulation study is carried out for balanced and unbalanced supply-voltage condi- tions. A laboratory prototype is also developed to validate the simulation results. From the detailed simulation and experimentation by the au- thors, it is found that the dc-link voltages of two inverters col- lapse for certain operating conditions when there is a sudden change in reference current. In order to investigate the behavior of the converter, the complete dynamic model of the system is developed from the equivalent circuit. The model is linearized and transfer functions are derived. Using the transfer functions, system behavior is analyzed for different operating conditions. This paper is organized as follows: The proposed control scheme is presented in Section II. Stability analysis of the con- verter is discussed in Section III. Simulation and experimental results are presented in Sections IV and V, respectively. II. CASCADED TWO-LEVEL INVERTER-BASED MULTILEVEL STATCOM Fig. 1 shows the power system model considered in this paper [13]. Fig. 2 shows the circuit topology of the cascaded two-level 0885-8977 © 2014 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission. See http://www.ieee.org/publications_standards/publications/rights/index.html for more information.
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