Single-Phase Power Generation Using Three-Phase Self-Excited Synchronous Reluctance Generator

Bhim Singh; Ram Niwas

doi:10.1515/ijeeps-2014-0006

Article

Single-Phase Power Generation Using Three-Phase Self-Excited Synchronous Reluctance Generator

Bhim Singh and Ram Niwas

Published/Copyright: May 20, 2014

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From the journal International Journal of Emerging Electric Power Systems Volume 15 Issue 4

Abstract

This paper presents the single-phase power generation using a three-phase synchronous reluctance generator (SyRG) for a standalone diesel generator (DG) set based standalone supply system. A static compensator (STATCOM) is used for voltage control, harmonics reduction and load balancing on SyRG. The proposed system consists of a SyRG, a variable frequency drive of an induction motor used as a prototype of diesel engine (DE), a STATCOM and single-phase loads. The proposed system feeds single-phase loads in rural areas and telecom towers. The synchronous reference frame theory (SRFT)–based control algorithm is used for the control of STATCOM used for voltage control and load balancing of SyRG.

Keywords: STATCOM (Static Compensator); DG (Diesel Generator) Set; SyRG (Synchronous Reluctance Generator); SRFT (Synchronous Reference Frame Theory); VSC (Voltage Source Converter); PCC (Point of Common Coupling)

Appendix A

Synchronous reluctance generator	Three phase, 230 V, 3.7 kW, Star connected,1,500 rpm, 50 Hz, X_d=22.51 Ω, X_q=5.47 Ω,R_s=0.188 Ω
STATCOM	R_f=5 Ω, C_f=5.4 μF, L_f=3.5 mH, C_dc=1650 μFV_dc=400 V
PI controllers	k_pv=0.2, k_pi=0.05, k_pdc=0.07, k_idc=0.08

Appendix B

Design of DC link capacitor

The design value of the DC link capacitor (C_dc) is selected on the basis of instantaneous energy to be supplied by VSC during transients. The design equation is expressed as,

(11)12CdcVdc2−Vdcmin2=3V(aI)t

where, I is the rms phase current of STATCOM, a is the overloading factor, V_dc is the reference dc voltage and V_dc_min is the minimum voltage level of dc bus, V is the phase voltage, and t is the time required for recovery of DC bus voltage.

Considering the minimum voltage level of the dc bus, V_dc_min= 395 V, I =10 A, V_dc=400 V, V=132.79 V, a=1.2 and t=750 ms, the calculated value of C_dc is 1,793 µF and it is selected as 1,650 µF.

Design of interfacing inductors

The designed value of interfacing inductors is decided by peak to peak current ripple (I_pp), DC link voltage (V_dc) and switching frequency (f_s) of VSC,

(12)Lf=3mVdc12afsIpp

where m is the modulation index. Considering m=1, a=1.2, I_pp = 1.5 A, V_dc = 400 V and f_s = 10 kHz, the value of L_f is obtained as 3.2 mH and a value of 3.5 mH is used in this work.

Design of ripple filter

The values of R_f and C_f are selected such that the impedance offered by the filter is small to high-frequency ripples and it is high for line frequency. The impedance offered by RC filter at any frequency f can be given as,

(13)Zf=Rf2+(1/2πfCf)2

Selecting R_f=5.0 Ω and C_f=5.4 μF the impedance of the filter is 7.7 Ω at a ripple frequency of 5 kHz and it is 589.48 Ω at line frequency of 50 Hz.

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Published Online: 2014-5-20

Published in Print: 2014-8-1

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Articles in the same Issue

https://doi.org/10.1515/ijeeps-2014-0006

Keywords for this article

STATCOM (Static Compensator); DG (Diesel Generator) Set; SyRG (Synchronous Reluctance Generator); SRFT (Synchronous Reference Frame Theory); VSC (Voltage Source Converter); PCC (Point of Common Coupling)