Operation control method suitable for fire extinguishing system of extra-high voltage converter station
An operation control method suitable for a fire extinguishing system of an extra-high voltage converter station is provided. The method includes: after an upper computer control system receives a sound-light alarm signal, an alarm position signal, and a switch position dividing signal, starting a spray range prediction analysis subsystem for a fixed fire monitor; determining, by the spray range prediction analysis subsystem for the fixed fire monitor based on an external wind direction and an external wind speed, whether a range of a fire monitor effectively covers an entire area of a converter transformer; and if yes, automatically presetting a first fire monitor to which a first compressed air foam generation subsystem belongs and a second fire monitor to which a second compressed air foam generation subsystem belongs; or if no, replacing a fire monitor with a mobile fire-fighting robot to extinguish a fire.
1. An operation control method suitable for a fire extinguishing system of a voltage converter station, wherein the fire extinguishing system of the voltage converter station comprises a first foam fire monitor extinguishing system, a second foam fire monitor extinguishing system, and an upper computer control system, the first foam fire monitor extinguishing system comprises a first fire monitor and a first compressed air foam generation subsystem, and the second foam fire monitor extinguishing system comprises a second fire monitor and a second compressed air foam generation subsystem; and the method comprises:
after the upper computer control system receives a sound-light alarm signal, an alarm position signal, and a switch position dividing signal, starting a spray range prediction analysis subsystem for a fixed fire monitor;
determining, by the spray range prediction analysis subsystem for the fixed fire monitor based on an external wind direction and an external wind speed, whether a range of the first and second fire monitors effectively covers an entire area of a converter transformer; and
if yes, starting the first compressed air foam generation subsystem and the second compressed air foam generation subsystem, such that the first fire monitor to which the first compressed air foam generation subsystem belongs and the second fire monitor to which the second compressed air foam generation subsystem belongs are automatically preset, and fixing a remote stand of the first and second fire monitors to extinguish a fire; or
if no, if the first fire monitor does not meet a range requirement, replacing the first fire monitor with a first mobile fire-fighting robot to extinguish the fire; if the second fire monitor does not meet the range requirement, replacing the second fire monitor with the first mobile fire-fighting robot or a second mobile fire-fighting robot to extinguish the fire; or if both the first fire monitor and the second fire monitor do not meet the range requirement, replacing the first fire monitor and the second fire monitor with the first and second mobile fire-fighting robots respectively to extinguish the fire.
2. The operation control method suitable for the fire extinguishing system of the voltage converter station according to claim 1 , wherein the upper computer control system receiving the sound-light alarm signal, the alarm position signal, and the switch position dividing signal comprises: obtaining signal data from two cable thermal detectors and two flame detectors through alarm coupling, performing, by a combined alarm controller, independent determining based on a two-out-of-three principle to output the sound-light alarm signal and the alarm position signal, and outputting the switch position dividing signal through an on-off action by a circuit breaker of a single valve group converter transformer and automatic power off by the single valve group converter transformer.
3. The operation control method suitable for the fire extinguishing system of the voltage converter station according to claim 2 , wherein the two-out-of-three principle comprises: at least one flame detector of the two flame detectors emits an action signal, indicating that action signal output is present in the flame detector side; the two flame detectors act as one output to form three outputs together with the two cable thermal detectors; and when at least two of the three outputs emit an action signal, the combined alarm controller alarms.
4. The operation control method suitable for the fire extinguishing system of the voltage converter station according to claim 1 , wherein the spray range prediction analysis subsystem for the fixed fire monitor is built in the upper computer control system.
5. The operation control method suitable for the fire extinguishing system of the voltage converter station according to claim 1 , wherein the operation of determining, by the spray range prediction analysis subsystem for the fixed fire monitor based on the external wind direction and the external wind speed, whether the range of the first and second fire monitors effectively covers the entire area of the converter transformer comprises:
establishing a confidence determining model for a wind environment fluctuation;
determining the external wind direction and the external wind speed based on the confidence determining model for the wind environment fluctuation;
establishing a prediction model for effective coverage performance of the fixed fire monitor; and
inputting the external wind direction and the external wind speed that are determined by the confidence determining model for the wind environment fluctuation into the prediction model for the effective coverage performance of the fixed fire monitor to determine whether the range of the first and second fire monitors effectively covers the entire area of the converter transformer.
6. The operation control method suitable for the fire extinguishing system of the extra voltage converter station according to claim 5 , wherein the operation of establishing the confidence determining model for the wind environment fluctuation comprises:
obtaining a basic wind speed according to a formula
v
basic
=
∑
t
i
=
1
t
i
=
n
v
f
t
i
n
,
wherein
v basic represents the basic wind speed;
V
f
t
i
represents a win speed at a time point t i ; and n represents a quantity of times that a wind speed detector takes a value;
obtaining a confidence value of a wind speed fluctuation according to a formula
η
=
❘
"\[LeftBracketingBar]"
v
f
t
i
-
v
basic
v
basic
❘
"\[RightBracketingBar]"
,
wherein
η represents the confidence value of the wind speed fluctuation;
obtaining a basic wind direction according to a formula
β
basic
=
∑
t
i
=
1
t
i
=
n
β
t
i
n
,
wherein
β basic represents the basic wind direction; and β t , represents a wind direction at the time point t i ; and
obtaining a confidence value of a wind direction angle fluctuation according to a formula
λ
=
❘
"\[LeftBracketingBar]"
β
t
i
-
β
basic
β
basic
❘
"\[RightBracketingBar]"
,
wherein
λ represents the confidence value of the wind direction angle fluctuation.
7. The operation control method suitable for the fire extinguishing system of the voltage converter station according to claim 6 , wherein the operation of determining the external wind direction and the external wind speed based on the confidence determining model for the wind environment fluctuation comprises:
when both the confidence value η of the wind speed fluctuation and the confidence value λ of the wind direction angle fluctuation are less than a preset value, determining that the external wind speed and the external wind direction are stable, using the basic wind speed v basic as the external wind speed, and using the basic wind direction β basic as the external wind direction; and
when both the confidence value η of the wind speed fluctuation and the confidence value λ of the wind direction angle fluctuation are greater than the preset value, determining that the external wind speed or the external wind direction fluctuates greatly, and a degree of an impact of an external wind environment on the fixed fire monitor also increases, obtaining 12 sectorial azimuth zones through division by a wind direction and wind speed probability statistical model by taking every 30° as a statistical azimuth to take wind direction statistics, taking a wind direction with a highest statistical probability as a reference wind direction, taking a statistical mean of wind speeds in a sectorial zone in which the reference wind direction is located as a reference wind speed, using the reference wind speed as the external wind speed, and using the reference wind direction as the external wind direction.
8. The operation control method suitable for the fire extinguishing system of the voltage converter station according to claim 7 , wherein the wind direction and wind speed probability statistical model comprises:
obtaining a frequency of a wind direction appearing in an azimuth i according to a formula
f
i
=
n
i
k
*
100
%
,
wherein
f i represents the frequency of the wind direction appearing in the azimuth i; n i represents a quantity of times that the wind direction appears in the azimuth i; and k represents a total quantity of azimuth records of the wind direction;
obtaining a highest frequency of the wind direction in the 12 sectorial azimuth zones according to a formula f max =MAX [f 1 ,f 2 , . . . , f 12 ], wherein
f 1 represents a frequency of the wind direction in an azimuth 1; f 2 represents a frequency of the wind direction in an azimuth 2; and f max represents the highest frequency of the wind direction in the 12 sectorial azimuth zones; and
obtaining an average wind speed within the azimuth i according to a formula
v
_
i
=
∑
x
=
1
x
=
n
1
v
1
x
n
i
,
wherein
v i represents the average wind speed within the azimuth i; and v i x represents a wind speed of an x th measurement within the azimuth i.
9. The operation control method suitable for the fire extinguishing system of the voltage converter station according to claim 5 , wherein the operation of establishing the prediction model for the effective coverage performance of the fixed fire monitor comprises:
obtaining an initial spray speed of the fixed fire monitor according to a formula
v
p
=
Q
flow
φ
π
r
2
,
wherein
r represents a radius of a barrel, φ represents a gas-liquid ratio, and Q flow represents a flow of foam mixed liquid;
obtaining a speed under a coupling condition of the fixed fire monitor and a wind speed according to a formula v o √{square root over ((v p cos θ+v f cos β) 2 +(v p sin θ+v f sin β) 2 )}, wherein v o represents the speed under the coupling condition of the fixed fire monitor and the wind speed, v p represents the initial spray speed of the fixed fire monitor, θ represents an initial spray angle with a value range of [0°, 360°], v f represents the external wind speed, and β represents the external wind direction with a value range of [0°, 360°];
obtaining a theoretical range of a coverage area of the fixed fire monitor according to a formula L=v 0 t, wherein t represents required time from release of foam to falling of the foam to the ground and
t
=
2
H
1
g
,
H 1 represents a layout height of the fixed fire monitor, and g represents a gravity acceleration;
obtaining an actual range of the coverage area of the fixed fire monitor according to a formula
L
0
=
λ
(
v
p
cos
θ
+
v
f
cos
β
)
2
+
(
v
p
sin
θ
+
v
f
sin
β
)
2
2
H
1
g
,
wherein λ represents a correction coefficient;
obtaining an actual spray angle of the fixed fire monitor under an impact of external wind according to a formula
cos
α
=
v
p
cos
θ
+
v
f
cos
β
v
a
;
and
obtaining an actually required range for a flaming converter transformer according to a formula
L
required
=
L
1
cos
α
,
wherein L 1 represents a distance from the fixed fire monitor to a farthest side of a firewall of the flaming converter transformer.
10. The operation control method suitable for the fire extinguishing system of the voltage converter station according to claim 9 , wherein the operation of inputting the external wind direction and the external wind speed that are determined by the confidence determining model for the wind environment fluctuation into the prediction model for the effective coverage performance of the fixed fire monitor to determine whether the range of the first and second fire monitors effectively covers the entire area of the converter transformer comprises:
when L 0 ≥L required , under the initial spray speed and the initial spray angle of the fixed fire monitor, the external wind speed, and the external wind direction, determining that the range of the fixed fire monitor effectively covers the entire area of the converter transformer; or
when L 0 <L required , under the initial spray speed and the initial spray angle of the fixed fire monitor, the external wind speed, and the external wind direction, determining that the range of the fixed fire monitor cannot effectively cover the entire area of the converter transformer.