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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
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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
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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
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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
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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
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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
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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
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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
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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 \/
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