Terminal Voltage and Output Power Control of Induction Generator

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Terminal Voltage and Output Power Control of Induction Generator Powered By Docstoc
					         Terminal Voltage and Output Power Control of Induction Generator
                 by Series and Parallel Compensation Using SMES

        Member             Tomonobu Senjyu          (University of the Ryukyus, b985542@tec.u-ryukyu.ac.jp)

        Student Member     Tatsuto Kinjo            (University of the Ryukyus, k028455@eve.u-ryukyu.ac.jp)

        Member             Katsumi Uezato           (University of the Ryukyus, uezato@eee.u-ryukyu.ac.jp)

        Member             Hideki Fujita            (Chubu Electric Power Co., Inc., Fujita.Hideki@chuden.co.jp)
  Keywords induction generator, superconducting magnetic energy storage, generating power leveling, bus voltage control.

   In recent year, power generation from renewable en-                       7000


ergy sources is comming up. Particularly, wind power



                                                                   vgd (V)
                                                                             6500
generation is attractive because of it’s advantages like,
pollution free, no fuel cost, abundantly available in na-                    6000

ture etc. However, the generated power is fluctuating
and it mainly depends on the wind speed. These fluc-                          5500
                                                                              800
tuations will arise the bus voltage fluctuations and will                       600
cause power oscillations. From such a background, the
                                                                   vgq (V)


                                                                               400
effective interconnection equipment which connects a                            200
power system and the wind power generation system                                    0
is required. Then, this this paper is considering intro-                     -200
                                                                                             2          3   4   5   6     7    8    9   10
duction of the series and parallel compensator with su-
                                                                        (a) The generator’s tarminal bus d-q axis voltage.
perconducting magnetic energy storage(SMES) as effec-                            5

tive interconnection equipment which solves the various                         4
                                                                   pt (MW)




problem of the wind power generation system. SMES                               3

unit based on a self-commutated inverter using Gate-                            2

                                                                                1
turn-off(GTO) thyristor is capable of controlling both
                                                                                0
the active and reactive power simultaneously and quickly.                      -1
In this paper, when the high-capacity induction gener-                           1
                                                                                0
ator is connected to a small-scale isolated power sys-
                                                                   qt (Mvar)




                                                                               -1
tem, control system configuration which achieve gener-                          -2
ating power leveling and generator’s terminal bus volt-                        -3
age compensation by applying the series and parallel                           -4

compensator is proposed. Moreover, control system                              -5
                                                                                         2          3       4   5   6    7     8    9   10
configuration of the two quadrant dc-chopper which op-                                            (b) Transmission line power flow.
erates as a fixed dc-link voltage sources is also proposed.                      1

                                                                                0
   In order to verify a control performance, system in-
                                                                   ps (MW)




                                                                               -1
terconnection simulation, wind speed turbulence and                            -2
three phase to ground fault simulation are performed.                          -3
Fig. 1 shows the simulation results of wind speed tur-                         -4

bulence. In Figs. 1(a) and (b), solid line and dashed                          -5
                                                                                 5
line shows the simulation results with the installing pro-                      4
                                                                   qs (Mvar)




posed equipment and the not installing proposed equip-                          3

ment, respectively. Fig. 1(a) and (b) show that the in-                         2

stalling proposed equipment can compensate effectively                           1

the bus voltage fluctuation and transmission line power                          0

                                                                               -1
oscillation . From Fig. 1(c), it can be confirmed that                                    2          3       4   5   6    7     8    9   10

the proposed equipment is absorbing or releasing the ac-                    (c) Actice and reactice output power
                                                                            of the series and parallel compensator.
tive and reactive power of reverse polarity as compared           Fig. 1. Simulation results at the wind speed turbulence .
with the transmission line power oscillation.