21 w\ 00 in“
TRANSCRIPT
US006107784A
United States Patent [19] [11] Patent Number: 6,107,784 Nomiya et al. [45] Date of Patent: Aug. 22, 2000
[54] SYSTEM INTERCONNECTION 5,798,633 8/1998 Larsen et a1. ......................... .. 323/207
PROTECTIVE DEVICE FOR NON-UTILITY 5,945,813 8/1999 Kondou et al. ....................... .. 323/205
GENERATION EQUIPMENT _ FOREIGN PATENT DOCUMENTS
[75] Inventors: Shigeo Nomiya, Funabashi; Chihiro Okado, Fuchu; Toyokuni Katoh, 8-214562 8/1996 Japan . Tatsuno, all of Japan 9-135537 5/1997 Japan .
9-247863 9/1997 Japan .
[73] Assignees: Kabushiki Kaisha Toshiba, Kawasaki; Nishishiba Electric Co., Ltd., Himeji, both of Japan Primary Examiner—Jessica Han
Attorney, Agent, or Firm—Finnegan, Henderson, FaraboW, [21] Appl' NO’: 09/125,759 Garrett & Dunner, L.L.P. [22] PCT Filed: Dec. 26, 1997
[57] ABSTRACT [86] PCT No.: PCT/JP97/04907
The isolation operation of a non-utility generation system (7) interconnected to a poWer system enable to be reliably
§ 102(e) Date: Mar. 1, 1999 detected in the non-utility generation system, providing a [87] PCT Pub‘ NO‘: W098/29933 transfer breaker. When the frequency change rate of the
non-utility generation system (7) has a positive value, the PCT P1lb~ Date? Jul- 9, 1998 advanced reactive poWer of the non-utility generation sys
§ 371 Date: Mar. 1, 1999
[30] Foreign Application Priority Data tern (7) is increased. When the frequency change rate of the non-utility generation system (7) has a negative value, the
Dec. 26, 1996 [JP] Japan .................................. .. 8-347357 delayed reactive power of the non_ut?ity generation System Dec. 26, 1996 [JP] Japan .. 8-347359 . . . Jan. 30, 1997 [JP] Japan .................................. .. 9-016949 (7) 1S mcreased' Furthen the gal“ of the Power Control
7 section (9) of the non-utility generation system (7) is [51] Int. Cl. ...................................................... .. G05F 1/70 adjusted in accordance With the frequency changc ratc AS [52] U-S- Cl- ~~~~~~~~~~~~~~~~ ~~ 323/205; 323/207; 307/87 the gain is thus adjusted, the voltage of the non-utility [58] Field Of Search ..................... .. 323/205, 206, generation System (7) changes~ ThiS change in the Voltage is
323/207’ 208’ 209’ 210; 307/85’ 86’ 87 detected. In accordance With the voltage change, the non
[56] References Cited utility generation system (7) is disconnected from the system poWer supply.
U.S. PATENT DOCUMENTS
4,878,208 10/1989 Sekietal. ......................... .. 323/207X 25 Claims, 25 Drawing Sheets
1
2 0 ~4
O
18 17 16 15 S O
s
uv|0v[0F UF<—L ° LOAD 5
21 w\ 00 in“ FAULT TRIP _________ "1L 9 21 30 31 mum 6'“ ° EXCESéIVE V31
—J~vs1 LERROR-DEI'ECTING » CHANGE-RATE .1, 35 cmcun ‘T DETECTOR S
25 13” 26 . ~v3o LEVEL TIMER S +_—' \ 34 DETECTOR _,
P 0 051501012 DETECTOR FUNCTION 3'6
I CIRCUIT CHANGE-OVER CIRCUIT f
27 11 1o 33 8 cc’ * CHANGE - LEVEL (&
SPEED P M gllRECRUlT T DETECTOR GOVERNOR ENG'NE 38~ 37
U.S. Patent Aug. 22,2000 Sheet 3 0f25 6,107,784
7
S V’ Vf SP 53 1 p—> S | S SQ
GENERATOR '0" - o 0
Q‘) a {PLQL
‘in + iCT iR N5
C L R
PIC-5.3
+A'F H
‘F ‘F0 1:
‘F2 -A‘F
t0
U.S. Patent Aug. 22, 2000 Sheet 6 0f25 6,107,784
!_ 39a ' ’-\-’39
) I‘ 3 390
3 39b
-_i
FIG. 9
57 9
AV * S 1 DELAY —_’ CIRCUIT AVR
AQ1* DELAY __’ CIRCUIT _’ AQR ~24
S 58
U.S. Patent Aug. 22, 2000 Sheet 9 0f 25 6,107,784
(FRQM FUNCTION CIRCUIT) *
F _________________ __l_/_s_v___,| ' 1 i 1 I K 1 :
P—E—-> TQE) @133 I
i P K : l i l __________________________ __l
*1 FIG.13 "Av
110 AVR)
107
3 V, V} AP 1(8):’, 101 P") S l S _9,A
GENERATOR q? o 0 Q“) ’ \1PL,QL
H11 iCT iR M105
0 L R FIG.14
+Af
f1
1= f0 t
12 — f
FIG.15 A to
U.S. Patent Aug. 22,2000 Sheet 10 0f25 6,107,784
E FIG. 16< dt
(VOLTAGE INCREASING
* COMMAND) AV 0 :
(VOLTAGE/J DECREASIN COMMAND )
V A0 ADVANCED A LITTLE
A0 DELAYED A LITTLE
+Af
f
—Af
F l G. I 7
M ._ h
H | I I I | I I | I l | | I all"
n 9
a b H II 1 4| _ o
4 4
1 \1 u G — I
Nll " F II "
.FI. ........... l. _|lll lllllllllllllllll II a _
2 u
4
1 u
N m _
H W n._._ n O W W % LI W
W W T
S N S H O
C % I
4
1420
U.S. Patent Aug. 22,2000 Sheet 14 0f25 6,107,784
V30
143
FUNCTION CIRCUIT
~ AV*
<-———-—P LOAD-RATIO SEETI NG SECTION
‘__L'__ VOLTAGE -
CHANGE REFERENCE CORRECTING SECTION
133 lrvM? (T0 AVR)
FIG. 22
143a “143 SEETING L» DEVICE
FIG. 23
U.S. Patent Aug. 22,2000 Sheet 15 0f25 6,107,784
.lllllll
SWITCH
SWITCH
SWITCH 4‘
SWITCH
SWITCH
SWITCH
CONTROLLER
lllIlllll'lllllllllll. llllllll'llllllll FIG. 24
U.S. Patent Aug. 22,2000 Sheet 17 0f25 6,107,784
207
V, Vf AP 2233 1 p—> S | 8 Ag
GENERATOR Q? - oo
0» -—> +PL,QL
205 ICT IR N
C L R
FIG. 26
+Af
f1
1‘ f0 t
f2 -Af
t0
FIG.27
U.S. Patent Aug. 22,2000 Sheet 18 0f25 6,107,784
? dt ‘r
FIG. 28 ‘ (VOLTAGE INCREASING
* COMMAND) A AV 0 : : : : : :
(\TOLTAGE- /~/ \/ DECREASING/ COMMAND)
+ A f /\ /\
M AQ ADVANCED A LITTLE .F
NM DELAYED A LITTLE — A f v \/
