A method for judging automatic power restoration of double busbar connection power failure equipment

Abstract

The present invention discloses a method for automatically restoring power supply to power-off equipment in a double-busbar wiring, the method comprising the following steps: 1. generating a plant-station wiring topology matrix; 2. determining the circuit breaker that needs to be opened; 3. determining the circuit breaker that needs to be closed; 4. adjusting the power grid wiring according to the circuit breaker that is opened and the circuit breaker that is closed, and restoring power supply to the equipment. The present invention can realize that in a double-busbar wiring mode with double main transformers and double tie lines, when the power supply mode is normally a feed-feed power supply mode, the power-off equipment automatically restores power supply, improves the reliability of power grid operation, and shortens the power supply restoration time of the power-off equipment; further improves the automation and intelligence of the power grid, and provides technical support for the transformation from manual power restoration to automatic power restoration.

Description

Technical Field

[0001] The invention relates to a method for automatically restoring power supply for double-busbar connection power-off equipment, and belongs to the technical field of power grid relay protection equipment. Background Art

[0002] With the increasing requirements for power grid reliability, higher requirements are placed on the rapid and correct restoration of power supply after the tripping of power grid equipment. For the main connection substation with double busbars, double main transformers and double interconnection lines, the feeding mode of power supply may cause the substation busbar to lose power due to some reasons. At present, for such faults, power supply is still restored manually, which requires a long time for manual judgment, and the dispatcher orders the monitor to restore power supply by remote operation. The correctness of manual judgment and power supply depends on the personal technical level and professional quality of the dispatcher and monitor, and there are hidden dangers of misoperation and misdispatching. In addition, the power supply time is about 10 minutes when the power is delivered by manual judgment, which seriously affects the reliability of power supply of the power grid.

[0003] In order to improve the rapid recovery of power supply of power-off equipment in double-busbar with double main transformers and double tie-line connection and improve the power supply reliability of the power grid, it is necessary to develop a method for automatically restoring power supply for power-off equipment in double-busbar connection. Summary of the invention

[0004] The purpose of the present invention is to provide a method for automatically restoring power supply to a double-busbar connection power-off device, aiming to solve the technical problem of how to accurately adjust the power grid connection mode and restore power supply when a power grid power outage occurs in a double-busbar connection mode with double main transformers and double interconnection lines.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A method for determining automatic power restoration of a double-busbar connection power-off device comprises the following steps:

[0007] 1) Generate plant and station wiring topology matrix;

[0008] 2) Determine the circuit breaker that needs to be opened;

[0009] 3) Determine the circuit breaker that needs to be closed;

[0010] 4) Adjust the grid connection according to the opening and closing circuit breakers to restore power supply to the equipment.

[0011] The purpose of the present invention can also be further achieved by the following technical measures:

[0012] In the aforementioned method for automatically restoring power supply to a double busbar connection power failure device, the step 1) of generating a plant-station connection topology matrix includes the following operations:

[0013]

[0014]

[0015] Transition matrix H = G 3 (3);

[0016] Plant-station connection topology matrix T = f(H) (4);

[0017] Among them: u1 is the voltage representation of main transformer 1, the voltage is 1 when it is normal, and 0 when there is no voltage; u2 is the voltage representation of main transformer 2, the voltage is 1 when it is normal, and 0 when there is no voltage; u3 is the voltage representation of I bus, the voltage is 1 when it is normal, and 0 when there is no voltage; u4 is the voltage representation of II bus, the voltage is 1 when it is normal, and 0 when there is no voltage; u5 is the voltage representation of tie line 1, the voltage is 1 when it is normal, and 0 when there is no voltage; u2 is the voltage representation of tie line 2, the voltage is 1 when it is normal, and 0 when there is no voltage;

[0018] g 11 =g 22 =g 33 =g 44 =g 55 =g 66 =1,g 13 =g 31 =QS 13 QF1QS 11 , g 14 =g 41 =QS 13 QF1QS 12 , g 23 =g 32 =QS 23 QF2 21 , g 24 =g 42 =QS 23 QF2 22 , g 34 =g 43 =QS 31 Q3QS 32 , g 35 =g 53 =QS 43 QF4 41 , g 45 =g 54 =QS 43 QF4 42 , g 36 =g 63 =QS 53 Q5Q 51 , g 46 =g 64 =QS 53 Q5Q52 , the rest g ij =g ji =0;QF i is the state of circuit breaker i, the closed position is 1, the open position is 0, QS i1 is the status of the I mother disconnector of circuit breaker i, the closed position is 1, the open position is 0, QS i2 is the status of the Ⅱ mother disconnector of circuit breaker i, the closed position is 1, the open position is 0, QS i3 is the state of the disconnector on the outgoing line side of circuit breaker i, the closed position is 1, and the open position is 0; the function f(H) is a normalization operation, which is 1 when the element of H is > 0 and 0 when H <= 0.

[0019] In the aforementioned method for determining automatic power restoration of a double-busbar connection power-off device, the step 2) of determining the circuit breaker that needs to be opened includes the following operations:

[0020]

[0021]

[0022]

[0023] Where: When the element in the device voltage matrix U changes from 1 to 0, the voltage mutation matrix U * The corresponding element is 1, and in other cases it is 0; that is, when u1 changes from 1 to 0, When u2 changes from 1 to 0, When u5 changes from 1 to 0, When u6 changes from 1 to 0, The dot product (.·) operation is the multiplication of the corresponding elements of the two matrices; when f1=1, the circuit breaker QF1 needs to be opened; when f2=1, the circuit breaker QF2 needs to be opened; when f5=1, the circuit breaker QF4 needs to be opened; when f6=1, the circuit breaker QF5 needs to be opened; in formula (7), f3 and f4 are 0.

[0024] The aforementioned method for automatically restoring power supply for a double-busbar connection power-off device, step 3) determining a circuit breaker that needs to be closed, specifically includes:

[0025] 3.1 According to the relevant provisions of the power grid operation, the priority of each circuit breaker closing is determined. The circuit breaker with a higher priority is closed before the circuit breaker with a lower priority;

[0026] 3.2 Determine the set of circuit breakers QF that may need to be closed 初范围 , that is, all circuit breakers that are currently in the open position;

[0027] 3.3 Use the exhaustive method to close only QF each time 初范围 A circuit breaker QF i, perform the following operations:

[0028] Based on the above assumptions, the circuit breaker QF i The state changes from 0 to 1, and the states of other circuit breakers remain unchanged, forming the relationship matrix G, transition matrix H and plant-station wiring topology matrix T in the current state, and then forming the equipment voltage matrix U and the voltage matrix U before power failure according to the current voltage state. 正常 ;

[0029] When TU-U 正常 = 0 (TU is the product of T and U), then the circuit breaker QF i Included in the selected circuit breaker closing set QF 精选 In the process, all eligible circuit breakers are screened out to form a selected circuit breaker closing set QF 精选 ;

[0030] 3.4 If the circuit breaker is selected, the circuit breaker is closed and the QF 精选 If the result is an empty set, then use the exhaustive method to close only QF each time. 初范围 Two circuit breakers QF i , QF j , perform the following operations:

[0031] Based on the above assumptions, the circuit breaker QF i , QF j The state changes from 0 to 1, and the states of other circuit breakers remain unchanged, forming the relationship matrix G, transition matrix H and plant-station wiring topology matrix T in the current state, and then forming the equipment voltage matrix U and the voltage matrix U before power failure according to the current voltage state. 正常 ;

[0032] When TU-U 正常 =0, the circuit breaker QF i , QF j Included in the selected circuit breaker combination set QF 精选组 In the process, all eligible circuit breakers are screened out to form a selected circuit breaker combination gate set QF 精选组 ;

[0033] 3.5 Select the circuit breaker to close the set QF 精选 Or select circuit breaker combination set QF 精选组 In the circuit breaker, select the circuit breaker or circuit breaker group with high priority as the circuit breaker QF that needs to be closed. 合闸 .

[0034] In the aforementioned method for automatically restoring power supply to a double-busbar connection power-off device, step 4) restoring power supply to the device specifically includes:

[0035] According to the calculated QF 分闸 , QF 合闸As a result, after a delay of t1, QF is separated 分闸 The circuit breaker that needs to be opened in the result, after a delay of t2, closes QF 合闸 The circuit breaker that needs to be closed.

[0036] In the aforementioned method for determining the automatic restoration of power supply for a double-busbar connection power-off device, in step 4), t1=8s, t2=0.5s.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1) It can realize the automatic power supply recovery judgment of equipment power failure in the double busbar with double main transformer and double contact line connection mode;

[0039] 2) Improve the reliability of power grid operation and shorten the time it takes to restore power to power-off equipment;

[0040] 3) Further improve the automation and intelligence level of the power grid, and provide technical support for the transition from manual power restoration to automatic power restoration. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a wiring diagram of a double busbar with double main transformers and double tie lines in Example 1. DETAILED DESCRIPTION

[0042] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0043] A method for determining automatic power restoration of a double-busbar connection power failure device of the present invention comprises the following steps:

[0044] Step 1) generating the plant-station wiring topology matrix includes the following operations:

[0045]

[0046]

[0047] Transition matrix H = G 3 (3);

[0048] Plant-station connection topology matrix T = f(H) (4);

[0049] Among them: u1 is the voltage representation of main transformer 1, the voltage is 1 when it is normal, and 0 when there is no voltage; u2 is the voltage representation of main transformer 2, the voltage is 1 when it is normal, and 0 when there is no voltage; u3 is the voltage representation of I bus, the voltage is 1 when it is normal, and 0 when there is no voltage; u4 is the voltage representation of II bus, the voltage is 1 when it is normal, and 0 when there is no voltage; u5 is the voltage representation of tie line 1, the voltage is 1 when it is normal, and 0 when there is no voltage; u2 is the voltage representation of tie line 2, the voltage is 1 when it is normal, and 0 when there is no voltage;

[0050] g11 =g 22 =g 33 =g 44 =g 55 =g 66 =1,g 13 =g 31 =QS 13 QF1QS 11 , g 14 =g 41 =QS 13 QF1QS 12 , g 23 =g 32 =QS 23 QF2 21 , g 24 =g 42 =QS 23 QF2 22 , g 34 =g 43 =QS 31 Q3QS 32 , g 35 =g 53 =QS 43 QF4 41 , g 45 =g 54 =QS 43 QF4 42 , g 36 =g 63 =QS 53 Q5Q 51 , g 46 =g 64 =QS 53 Q5Q 52 , the rest g ij =g ji =0;QF i is the state of circuit breaker i, the closed position is 1, the open position is 0, QS i1 is the status of the I mother disconnector of circuit breaker i, the closed position is 1, the open position is 0, QS i2 is the status of the Ⅱ mother disconnector of circuit breaker i, the closed position is 1, the open position is 0, QS i3 is the state of the disconnector on the outgoing line side of circuit breaker i, the closed position is 1, and the open position is 0; the function f(H) is a normalization operation, which is 1 when the element of H is > 0 and 0 when H <= 0.

[0051] Step 2) determining the circuit breaker that needs to be opened includes the following operations:

[0052]

[0053]

[0054]

[0055] Where: When the element in the device voltage matrix U changes from 1 to 0, the voltage mutation matrix U * The corresponding element is 1, and in other cases it is 0; that is, when u1 changes from 1 to 0, When u2 changes from 1 to 0, When u5 changes from 1 to 0, When u6 changes from 1 to 0, The dot product (.·) operation is the multiplication of the corresponding elements of the two matrices; when f1=1, the circuit breaker QF1 needs to be opened; when f2=1, the circuit breaker QF2 needs to be opened; when f5=1, the circuit breaker QF4 needs to be opened; when f6=1, the circuit breaker QF5 needs to be opened; in formula (7), f3 and f4 are 0.

[0056] Step 3) Determine the circuit breaker that needs to be closed, including:

[0057] 3.1 According to the relevant provisions of the power grid operation, the priority of each circuit breaker closing is determined. The circuit breaker with a higher priority is closed before the circuit breaker with a lower priority;

[0058] 3.2 Determine the set of circuit breakers QF that may need to be closed 初范围 , that is, all circuit breakers that are currently in the open position;

[0059] 3.3 Use the exhaustive method to close only QF each time 初范围 A circuit breaker QF i , perform the following operations:

[0060] Based on the above assumptions, the circuit breaker QF i The state changes from 0 to 1, and the states of other circuit breakers remain unchanged, forming the relationship matrix G, transition matrix H and plant-station wiring topology matrix T in the current state, and then forming the equipment voltage matrix U and the voltage matrix U before power failure according to the current voltage state. 正常 ;

[0061] When TU-U 正常 = 0 (TU is the product of T and U), then the circuit breaker QF i Included in the selected circuit breaker closing set QF 精选 In the process, all eligible circuit breakers are screened out to form a selected circuit breaker closing set QF 精选 ;

[0062] 3.4 If the circuit breaker is selected, the circuit breaker is closed and the QF 精选 If the result is an empty set, then use the exhaustive method to close only QF each time. 初范围 Two circuit breakers QFi , QF j , perform the following operations:

[0063] Based on the above assumptions, the circuit breaker QF i , QF j The state changes from 0 to 1, and the states of other circuit breakers remain unchanged, forming the relationship matrix G, transition matrix H and plant-station wiring topology matrix T in the current state, and then forming the equipment voltage matrix U and the voltage matrix U before power failure according to the current voltage state. 正常 ;

[0064] When TU-U 正常 =0, the circuit breaker QF i , QF j Included in the selected circuit breaker combination set QF 精选组 In the process, all eligible circuit breakers are screened out to form a selected circuit breaker combination gate set QF 精选组 ;

[0065] 3.5 Select the circuit breaker to close the set QF 精选 Or select circuit breaker combination set QF 精选组 In the circuit breaker, select the circuit breaker or circuit breaker group with high priority as the circuit breaker QF that needs to be closed. 合闸 .

[0066] Step 4) Restore power to the device, including:

[0067] According to the calculated QF 分闸 , QF 合闸 As a result, after a delay of t1, QF is separated 分闸 The circuit breaker that needs to be opened in the result, after a delay of t2, closes QF 合闸 The circuit breaker that needs to be closed. Among them, t1 = 8s, t2 = 0.5s.

[0068] by Figure 1 The circuit shown is an embodiment, which illustrates the implementation method of the present invention.

[0069] Initial conditions: QF1, QS 11 , QS 13 Combination, QS 12 Percentile, QF2, QS 22 , QS 23 Combination, QS 21 Percentile, QS 31 , QS 32 Combined, QF3, QS 41 , QS 43 Combined position QF4, QS 42 Percentile, QS 52 , QS 53Combined position QF5, QS 51 All equipment has voltage. For some reason, main transformer 1 loses power. The method for judging the automatic restoration of power supply for equipment with double busbar connection power failure is as follows:

[0070] 1. Confirmation of opening circuit breaker

[0071] By definition, the voltage mutation matrix Circuit Breaker Matrix but That is, when f1=1, the circuit breaker QF1 needs to be opened.

[0072] 2. Confirmation of opening circuit breaker

[0073] Define the closing priorities of circuit breakers QF1, QF2, QF4, QF5, and QF3 in descending order.

[0074] Closed circuit breaker set QF 初范围 The currently open circuit breakers are circuit breakers QF4, QF5, and QF3.

[0075] 2.1 When QF4 is closed, according to the calculation Calculation resultsTU-U 正常 =0; therefore QF4 should be included in the selected circuit breaker closing set QF 精选 middle.

[0076] 2.2 When QF5 is closed, according to the calculation Calculation results Therefore, QF5 should not be included in the selected circuit breaker closing set QF 精选 middle.

[0077] 2.3 When QF3 is closed, according to the calculation Calculation resultsTU-U 正常 =0; therefore QF3 should be included in the selected circuit breaker closing set QF 精选 middle.

[0078] 2.4 The calculation results show that the selected circuit breaker closing set QF 精选 Including circuit breakers QF3 and QF4, since QF4 has a higher priority than QF3, QF 合闸 =QF4.

[0079] 3. After an 8s delay, the circuit breaker QF1 is opened, and after another 0.5s delay, the circuit breaker QF4 is closed, and the power supply of the power grid is restored.

[0080] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present invention.

Claims

1. A method for determining automatic power restoration of double busbar connection power failure equipment, characterized in that: The following steps are involved: 1) Generate plant and station wiring topology matrix; The following operations are included: Device Voltage Matrix Relationship Matrix Transition matrix H = G 3 (3); Plant-station connection topology matrix T = f(H)(4); Among them: u1 is the voltage of main transformer 1, the voltage is 1 when it is normal, and 0 when there is no voltage; u2 is the voltage of main transformer 2, the voltage is 1 when it is normal, and 0 when there is no voltage; 3 u is represented by the voltage of I, the voltage is 1 when it is normal, and 0 when there is no voltage; u4 is represented by the voltage of II, the voltage is 1 when it is normal, and 0 when there is no voltage; u 5 u is the voltage representation of tie line 1, the voltage is 1 when it is normal, and 0 when there is no voltage; u2 is the voltage representation of tie line 2, the voltage is 1 when it is normal, and 0 when there is no voltage; g 11 =g 22 =g 33 =g 44 =g 55 =g 66 =1,g 13 =g 31 =QS 13 QF1QS 11 ,g 14 =g 41 =QS 13 QF1QS 12 , g 23 =g 32 =QS 23 QF2QS 21 ,g 24 =g 42 =QS 23 QF2QS 22 ,g 34 =g 43 =QS 31 QF3QS 32 , g 35 =g 53 =QS 43 QF4QS 41 ,g 45 =g 54 =QS 43 QF4QS 42 ,g 36 =g 63 =QS 53 QF5QS 51 , g 46 =g 64 =QS 53 Q5Q 52 , the rest g ij =g ji =0;QF i is the state of circuit breaker i, the closed position is 1, the open position is 0, QS i1 is the status of the I mother disconnector of circuit breaker i, the closed position is 1, the open position is 0, QS i2 is the status of the Ⅱ mother disconnector of circuit breaker i, the closed position is 1, the open position is 0, QS i3 is the state of the disconnector on the outgoing line side of circuit breaker i, the closed position is 1, and the open position is 0; the function f(H) is a normalization operation, which is 1 when the element of H is > 0 and 0 when H <= 0; 2) Determine the circuit breaker that needs to be opened; The following operations are included: Voltage mutation matrix Circuit Breaker Matrix Opening circuit breaker matrix Where: When the element in the device voltage matrix U changes from 1 to 0, the voltage mutation matrix U * The corresponding element is 1, and in other cases it is 0; that is, when u1 changes from 1 to 0, When u2 changes from 1 to 0, When u5 changes from 1 to 0, When u6 changes from 1 to 0, The dot product (.·) operation is the multiplication of the corresponding elements of the two matrices; when f1=1, the circuit breaker QF1 needs to be opened; when f2=1, the circuit breaker QF2 needs to be opened; when f5=1, the circuit breaker QF4 needs to be opened; when f6=1, the circuit breaker QF5 needs to be opened; in formula (7), f3 and f4 are 0; 3) Determine the circuit breakers that need to be closed, including: 3.1 According to the relevant regulations of power grid operation, the priority of each circuit breaker closing is determined. The circuit breaker with higher priority is closed before the circuit breaker with lower priority; 3.2 Determine the set of circuit breakers QF that may need to be closed 初范围 , that is, all circuit breakers that are currently in the open position; 3.3 Use the exhaustive method to close only QF each time 初范围 A circuit breaker QF i , perform the following operations: Based on the above assumptions, the circuit breaker QF i The state changes from 0 to 1, and the states of other circuit breakers remain unchanged, forming the relationship matrix G, transition matrix H and plant-station wiring topology matrix T in the current state, and then forming the equipment voltage matrix U and the voltage matrix U before power failure according to the current voltage state. 正常 ; When TU-U 正常 =0, the circuit breaker QF i Included in the selected circuit breaker closing set QF 精选 In the process, all eligible circuit breakers are selected to form a selected circuit breaker closing set QF 精选 ; 3.4 If the circuit breaker is selected, the circuit breaker is closed and the QF 精选 If the result is an empty set, then use the exhaustive method to close only QF each time. 初范围 Two circuit breakers QF i , QF j , perform the following operations: Based on the above assumptions, the circuit breaker QF i , QF j The state changes from 0 to 1, and the states of other circuit breakers remain unchanged, forming the relationship matrix G, transition matrix H and plant-station wiring topology matrix T in the current state, and then forming the equipment voltage matrix U and the voltage matrix U before power failure according to the current voltage state. 正常 ; When TU-U 正常 =0, the circuit breaker QF i , QF j Included in the selected circuit breaker combination set QF 精选组 In the process, all eligible circuit breakers are selected to form a selected circuit breaker combination set QF 精选组 ; 3.5 Select the circuit breaker to close the set QF 精选 Or select circuit breaker combination set QF 精选组 In the circuit breaker, select the circuit breaker or circuit breaker group with high priority as the circuit breaker QF that needs to be closed. 合闸 ; 4) Adjust the grid connection according to the opening and closing circuit breakers to restore power supply to the equipment; Specifically include: According to the calculated QF 分闸 , QF 合闸 As a result, after a delay of t1, QF is separated 分闸 The circuit breaker that needs to be opened in the result, after a delay of t2, closes QF 合闸 The circuit breaker that needs to be closed.

2. A method for determining automatic power restoration of double busbar connection power failure equipment as claimed in claim 1, characterized in that: In step 4), t1=8s, t2=0.5s.

Images