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A multifunctional dstatcom operating under stiff source
1.
www.projectsatbangalore.com 09591912372 IEEE TRANSACTIONS
ON INDUSTRIAL ELECTRONICS, VOL. 61, NO. 7, JULY 2014 3131 A Multifunctional DSTATCOM Operating Under Stiff Source Chandan Kumar, Student Member, IEEE, and Mahesh K. Mishra, Senior Member, IEEE Abstract—Loads connected to a stiff source cannot be protected from voltage disturbances using a distribution static compen- sator (DSTATCOM). In this paper, a new control-algorithm-based multifunctional DSTATCOM is proposed to operate in voltage control mode under stiff source. This scheme provides fast voltage regulation at the load terminal during voltage disturbances and protects critical loads. In addition, during normal operation, the generated reference load voltages allow control of the source cur- rents. Consequently, DSTATCOM injects reactive and harmonic components of load currents to make source power factor unity. Simulation and experimental results are presented to verify the efficacy of the proposed control algorithm and multifunctional DSTATCOM. Index Terms—Distribution static compensator (DSTATCOM), multifunctional, power factor, stiff source, voltage regulation. I. INTRODUCTION A distribution static compensator (DSTATCOM) can mit- igate several power quality (PQ) problems, depending upon the mode of operation. In current control mode (CCM) [1]–[6], it injects harmonic and reactive components of load currents to make source currents balanced, sinusoidal, and in phase with load voltages. In voltage control mode (VCM) [7]–[13], it regulates load voltage at a constant value to pro- tect sensitive loads from voltage disturbances such as sags, swells, transients, and/or fluctuations. However, the objectives of these two modes are different and cannot be achieved simultaneously. Based on the distance between source and load, a source is termed as stiff or nonstiff. If the distance is long, then source is termed as nonstiff and has high feeder impedance, whereas if the distance is very small, then source is termed as stiff and has negligible feeder impedance. Generally, a source (stiff or nonstiff) supplies a permissible range of voltage, which is suffi- cient for satisfactory performance of load [14]. In this situation, DSTATCOM should operate in CCM. However, due to grid faults, the source voltage (stiff or nonstiff) can change at any time, and then, the VCM operation is required. DSTATCOM regulates the load voltage by indirectly regulating the voltage Manuscript received November 28, 2012; revised March 4, 2013 and June 7, 2013; accepted July 19, 2013. Date of publication August 6, 2013; date of current version January 31, 2014. This work was supported by the Department of Science and Technology, India, under the project grant DST/TM/SERI/ 2k10/47(G). The authors are with the Department of Electrical Engineering, Indian In- stitute of Technology Madras, Chennai 600 036, India (e-mail: chandan3107@ gmail.com; mahesh@ee.iitm.ac.in). Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TIE.2013.2276778 Fig. 1. Single-phase equivalent circuit of DSTATCOM in a distribution network. across the feeder impedance. When a load is connected to nearly a stiff source, feeder impedance will be negligible [1]– [4], [15], [16]. Under these circumstances, DSTATCOM cannot provide sufficient voltage regulation at the load terminal [9]. There is lack of literature addressing the feasibility of the VCM operation of DSTATCOM under stiff source. In present work, this problem is addressed while ensuring that, during normal operation, the advantages of CCM are retained. This paper proposes a new control-algorithm-based DSTATCOM topology for voltage regulation even under stiff source. It is achieved by connecting a suitable external inductor in series between the load and the source point. The point of common coupling (PCC) will be the point where external in- ductor and source are connected. A DSTATCOM connected at the load terminal provides voltage regulation by indirectly reg- ulating the voltage across the external inductor. The proposed control algorithm to obtain variable reference load voltages is formulated as a function of the desired source current. This voltage indirectly controls the current drawn from the source for a permissible range of source voltage. Therefore, the control algorithm makes source currents balanced, sinusoidal, and in phase with respective source voltages during normal operation. During voltage disturbances, a constant voltage is maintained at the load terminal. Hence, the proposed topology and the control algorithm make the compensator multifunctional, so that it provides fast voltage regulation at the load terminal and additionally provides advantages of CCM while operating in VCM. Simulation and experimental results are presented to verify the efficacy of the proposed control algorithm and multifunctional DSTATCOM. II. DSTATCOM CONFIGURATION A neutral-point-clamped voltage source inverter (VSI) topol- ogy is chosen as it provides independent control of each leg of the VSI [7]. A single-phase equivalent circuit of DSTATCOM in a distribution network is shown in Fig. 1. The 0278-0046 © 2013 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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