Railway junction substation diesel generator emergency power supply starting method

Abstract

The application relates to a railway hub substation diesel generator emergency power supply starting method, which relates to the technical field of power systems, and periodically detects the three-phase voltage of a high-voltage incoming line of a railway hub substation and a busbar where the high-voltage incoming line is located, judges whether the diesel generator starting condition is met according to the detection value, and judges the grid-connection condition of the diesel generator according to the working conditions of the high-voltage incoming line, the busbar, a high-voltage incoming line breaker and a diesel generator breaker in combination with the coordination condition of operation and dispatching after the diesel generator starting condition is met, so as to timely start the diesel generator. The method can effectively avoid multi-power grid-connection accidents and guarantee the safe input of the diesel generator.

Description

Technical Field

[0001] This invention relates to power system technology, and in particular to a method for starting an emergency power supply for a diesel generator in a railway hub substation. Background Technology

[0002] The backup diesel generators in railway hub stations serve as emergency power sources for particularly important loads within the primary load category. They typically employ high-power, high-reliability units and are required to automatically start supplying power within 15 to 60 seconds after a power outage.

[0003] Starting a diesel generator involves multiple roles, including dispatchers, maintenance workers, and on-duty personnel. If coordination is not proper, starting the diesel generator may lead to a multi-power grid connection accident, which could result in serious injuries or fatalities to repair personnel. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a method for starting up an emergency power supply for a diesel generator in a railway hub substation that can effectively avoid multi-power grid connection accidents and ensure the safe commissioning of the diesel generator.

[0005] To solve the above-mentioned technical problems, the present invention provides a method for starting an emergency power supply for a diesel generator in a railway hub substation. The railway hub substation is equipped with an in-station diesel generator, a diesel-electric circuit breaker for controlling the connection of the in-station diesel generator to the in-station power supply line, and an external control terminal for controlling the operation of the in-station diesel generator. The method is characterized by:

[0006] A diesel-electric interlocking plate is installed in the railway hub substation for the protection of the diesel-electric circuit breaker closing. When the diesel-electric interlocking plate is engaged, it can restrict the closing of the diesel-electric circuit breaker; when the diesel-electric interlocking plate is disengaged, it can release the closing restriction of the diesel-electric circuit breaker. During maintenance of the railway hub substation, the external control terminal outputs a corresponding command to control the diesel-electric interlocking plate to engage, and vice versa.

[0007] In the external control terminal, define a diesel-electric start-up status variable S1 and a diesel-electric dispatch variable K1. When the external control terminal controls the diesel generator in the station to stop, the external control terminal sets S1=0. When the external control terminal allows the diesel generator in the station to connect to the power supply line in the station, the external control terminal sets K1=0. Otherwise, it sets K1=1.

[0008] The specific steps for starting a diesel generator as an emergency power source are as follows:

[0009] Step 1: At intervals of Ts, detect the three-phase voltage of the high-voltage incoming line of the railway hub substation and the three-phase voltage of the busbar where the high-voltage incoming line is located.

[0010] If U1a, U1b, U1c, U2a, U2b, and U2c are all less than Uloss, and at least one of U1a, U1b, and U1c is greater than or equal to Uex in the first Ts time interval, then proceed to step 2; otherwise, repeat this step.

[0011] Ts is the preset monitoring interval duration, U1a, U1b, and U1c are the three-phase voltages of the high-voltage incoming line of the railway hub substation, U2a, U2b, and U2c are the three-phase voltages of the bus where the high-voltage incoming line of the railway hub substation is located, Uloss is the preset voltage loss threshold, and Uex is the preset voltage presence threshold.

[0012] Step 2: Every Ts interval, detect the three-phase voltage of the high-voltage incoming line of the railway hub substation and the three-phase voltage of the bus where the high-voltage incoming line is located. If condition 2.1 is met, proceed to step 3; if condition 2.2 is met, proceed to step 1; if neither condition 2.1 nor condition 2.2 is met, repeat this step.

[0013] Condition 2.1: Within a consecutive N Ts duration, U1a, U1b, and U1c are all less than Uloss;

[0014] Condition 2.2: At least one of U1a, U1b, and U1c is greater than or equal to Uloss;

[0015] N is the preset anti-shake delay coefficient;

[0016] Step 3, calculate the FStar value. The specific calculation formula is as follows:

[0017] FStar=S1+B1+F1+K1+F1×(U2a+U2b+U2c) / Un+K1×(U1a+U1b+U1c) / Un

[0018] In the formula, B1 is the status value of the high-voltage incoming circuit breaker of the railway hub substation, B1=1 represents that the high-voltage incoming circuit breaker is in the closed state, and B1=0 represents that the high-voltage incoming circuit breaker is in the open state; F1 is the status value of the diesel-electric interlocking plate, F1=1 represents that the diesel-electric interlocking plate is in the engaged state, and F1=0 represents that the diesel-electric interlocking plate is in the disengaged state; Un is the rated voltage of the high-voltage incoming line of the railway hub substation.

[0019] If the FStar value is less than 1, the external control terminal sends a start command to the control equipment of the diesel generator in the station and proceeds to step 4;

[0020] Conversely, the FStar value is calculated every Tk time interval until the calculated FStar value is less than 1. Then, the external control terminal sends a diesel generator start command to the control equipment of the diesel generator in the station and proceeds to step 4. Alternatively, the FStar value is calculated repeatedly until the number of repetitions reaches the preset repetition threshold and then proceeds to step 1.

[0021] Step 4, calculate the FRun value. The specific calculation formula is as follows:

[0022] FRun=B1+F1+K1+K1×(U1a+U1b+U1c) / Un

[0023] If FRun≥1, terminate the diesel generator start command and return to step 1; otherwise, proceed to step 5.

[0024] Step 5, calculate the Fb value. The specific calculation formula is as follows:

[0025] Fb=(U2a+U2b+U2c) / Uex

[0026] If Fb≥1, it indicates that the diesel generator has started successfully, and proceed to step 6; otherwise, calculate the Fb value every Tr time interval until the calculated Fb≥1, and then proceed to step 5.

[0027] Step 6: The diesel generator startup is now complete. Set S1=1.

[0028] The emergency power start-up method for diesel generators in railway hub substations provided by this invention divides the roles of diesel generator participants, enabling operation and maintenance and dispatch to participate in the diesel generator start-up process. It combines the operating conditions of the high-voltage incoming line, busbar, high-voltage incoming line circuit breaker, and diesel-electric circuit breaker of the railway hub substation to determine the grid connection conditions of the diesel generator, which can effectively avoid multi-power grid connection accidents and ensure the safe commissioning of diesel generators. Detailed Implementation

[0029] The technical solution of the present invention will be further described in detail below with reference to specific embodiments. However, these embodiments are not intended to limit the present invention. Any similar structures and similar variations of the present invention should be included in the protection scope of the present invention. The commas in the present invention all indicate the relationship between and. The English letters in the present invention are case-sensitive.

[0030] This invention provides a method for starting an emergency power supply for a diesel generator in a railway hub substation. The railway hub substation is equipped with an in-station diesel generator, a diesel-electric circuit breaker for controlling the connection of the in-station diesel generator to the in-station power supply line, and an external control terminal (usually located in the railway hub dispatching center) for controlling the operation of the in-station diesel generator. The method is characterized by:

[0031] A diesel-electric interlocking plate is installed in the railway hub substation for the protection of the diesel-electric circuit breaker closing. When the diesel-electric interlocking plate is engaged, it can restrict the closing of the diesel-electric circuit breaker; when the diesel-electric interlocking plate is disengaged, it can release the closing restriction of the diesel-electric circuit breaker. During maintenance of the railway hub substation, the external control terminal outputs a corresponding command to control the diesel-electric interlocking plate to engage, and vice versa.

[0032] Define a diesel-electric start-up status variable S1 and a diesel-electric dispatch variable K1 in the external control terminal. When the external control terminal controls the diesel generator in the station to stop, the external control terminal sets S1=0. When the external control terminal allows the diesel generator in the station to connect to the power supply line in the station (whether it is allowed is manually set according to the dispatch plan), the external control terminal sets K1=0. Otherwise, it sets K1=1.

[0033] The specific steps for starting a diesel generator as an emergency power source are as follows:

[0034] Step 1: At intervals of Ts, detect the three-phase voltage of the high-voltage incoming line of the railway hub substation and the three-phase voltage of the busbar where the high-voltage incoming line is located.

[0035] If U1a, U1b, U1c, U2a, U2b, and U2c are all less than Uloss, and at least one of U1a, U1b, and U1c is greater than or equal to Uex in the first Ts time interval, then proceed to step 2; otherwise, repeat this step.

[0036] Ts is the preset monitoring interval duration, U1a, U1b, and U1c are the three-phase voltages of the high-voltage incoming line of the railway hub substation, U2a, U2b, and U2c are the three-phase voltages of the bus where the high-voltage incoming line of the railway hub substation is located, Uloss is the preset voltage loss threshold, and Uex is the preset voltage presence threshold.

[0037] In this embodiment, Ts is set to 20ms, Uloss = Un 30%, Uex = Un 70%, and Un is the rated voltage of the high-voltage incoming line of the railway hub substation.

[0038] Step 2: Every Ts interval, detect the three-phase voltage of the high-voltage incoming line of the railway hub substation and the three-phase voltage of the bus where the high-voltage incoming line is located. If condition 2.1 is met (indicating that the diesel generator starting conditions are met), proceed to step 3. If condition 2.2 is met, proceed to step 1. If neither condition 2.1 nor condition 2.2 is met, repeat this step.

[0039] Condition 2.1: Within a consecutive N Ts duration, U1a, U1b, and U1c are all less than Uloss;

[0040] Condition 2.2: At least one of U1a, U1b, and U1c is greater than or equal to Uloss;

[0041] N is a preset anti-shake delay coefficient. In this embodiment, N=10, and 10 Ts durations equal 200ms duration.

[0042] Step 3, calculate the FStar value. The specific calculation formula is as follows:

[0043] FStar=S1+B1+F1+K1+F1×(U2a+U2b+U2c) / Un+K1×(U1a+U1b+U1c) / Un

[0044] In the formula, B1 is the status value of the high-voltage incoming circuit breaker of the railway hub substation. B1=1 represents that the high-voltage incoming circuit breaker is in the closed state, and B1=0 represents that the high-voltage incoming circuit breaker is in the open state; F1 is the status value of the diesel-electric interlocking plate. F1=1 represents that the diesel-electric interlocking plate is in the engaged state, and F1=0 represents that the diesel-electric interlocking plate is in the disengaged state.

[0045] If the FStar value is less than 1, the external control terminal sends a start command to the control equipment of the diesel generator in the station and proceeds to step 4;

[0046] Conversely, the FStar value is calculated every Tk time interval until the calculated FStar value is less than 1. Then, the external control terminal sends a diesel generator start command to the control equipment of the diesel generator in the station and proceeds to step 4. Alternatively, if the number of times the FStar value is calculated reaches the preset repetition threshold (indicating that the diesel generator is not allowed to be controlled), the process proceeds to step 1.

[0047] Step 4, calculate the FRun value. The specific calculation formula is as follows:

[0048] FRun=B1+F1+K1+K1×(U1a+U1b+U1c) / Un

[0049] If FRun≥1, terminate the diesel generator start command and return to step 1; otherwise, proceed to step 5.

[0050] Step 5, calculate the Fb value. The specific calculation formula is as follows:

[0051] Fb=(U2a+U2b+U2c) / Uex

[0052] If Fb≥1, it indicates that the diesel generator has started successfully, and proceed to step 6; otherwise, calculate the Fb value every Tr time interval until the calculated Fb≥1, and then proceed to step 5.

[0053] Step 6: The diesel generator startup is now complete. Set S1=1.

Claims

1. A method for starting an emergency power supply for a diesel generator in a railway hub substation, wherein the railway hub substation is equipped with an in-station diesel generator, a diesel-electric circuit breaker for controlling the connection of the in-station diesel generator to the in-station power supply line, and an external control terminal for controlling the operation of the in-station diesel generator, characterized in that: A diesel-electric interlocking plate is installed in the railway hub substation for the protection of the diesel-electric circuit breaker closing. When the diesel-electric interlocking plate is engaged, it can restrict the closing of the diesel-electric circuit breaker; when the diesel-electric interlocking plate is disengaged, it can release the closing restriction of the diesel-electric circuit breaker. During maintenance of the railway hub substation, the external control terminal outputs a corresponding command to control the diesel-electric interlocking plate to engage, and vice versa. In the external control terminal, define a diesel-electric start-up status variable S1 and a diesel-electric dispatch variable K1. When the external control terminal controls the diesel generator in the station to stop, the external control terminal sets S1=0. When the external control terminal allows the diesel generator in the station to connect to the power supply line in the station, the external control terminal sets K1=0. Otherwise, it sets K1=1. The specific steps for starting a diesel generator as an emergency power source are as follows: Step 1: At intervals of Ts, detect the three-phase voltage of the high-voltage incoming line of the railway hub substation and the three-phase voltage of the busbar where the high-voltage incoming line is located. If U1a, U1b, U1c, U2a, U2b, and U2c are all less than Uloss, and at least one of U1a, U1b, and U1c is greater than or equal to Uex in the first Ts time interval, then proceed to step 2; otherwise, repeat this step. Ts is the preset monitoring interval duration, U1a, U1b, and U1c are the three-phase voltages of the high-voltage incoming line of the railway hub substation, U2a, U2b, and U2c are the three-phase voltages of the bus where the high-voltage incoming line of the railway hub substation is located, Uloss is the preset voltage loss threshold, and Uex is the preset voltage presence threshold. Step 2: Every Ts interval, detect the three-phase voltage of the high-voltage incoming line of the railway hub substation and the three-phase voltage of the bus where the high-voltage incoming line is located. If condition 2.1 is met, proceed to step 3; if condition 2.2 is met, proceed to step 1; if neither condition 2.1 nor condition 2.2 is met, repeat this step. Condition 2.1: Within a consecutive N Ts duration, U1a, U1b, and U1c are all less than Uloss; Condition 2.2: At least one of U1a, U1b, and U1c is greater than or equal to Uloss; N is the preset anti-shake delay coefficient; Step 3, calculate the FStar value. The specific calculation formula is as follows: FStar=S1+B1+F1+K1+F1×(U2a+U2b+U2c) / Un+K1×(U1a+U1b+U1c) / Un In the formula, B1 is the state value of the high-voltage incoming circuit breaker of the railway hub substation. B1=1 represents that the high-voltage incoming circuit breaker is in the closed state, and B1=0 represents that the high-voltage incoming circuit breaker is in the open state. F1 is the state value of the diesel-electric interlocking pressure plate. F1=1 means that the diesel-electric interlocking pressure plate is in the engaged state, and F1=0 means that the diesel-electric interlocking pressure plate is in the disengaged state; Un is the rated voltage of the high-voltage incoming line of the railway hub substation. If the FStar value is less than 1, the external control terminal sends a start command to the control equipment of the diesel generator in the station and proceeds to step 4; Conversely, the FStar value is calculated every Tk time interval until the calculated FStar value is less than 1. Then, the external control terminal sends a diesel generator start command to the control equipment of the diesel generator in the station and proceeds to step 4. Alternatively, the FStar value is calculated repeatedly until the number of repetitions reaches the preset repetition threshold and then proceeds to step 1. Step 4, calculate the FRun value. The specific calculation formula is as follows: FRun=B1+F1+K1+K1×(U1a+U1b+U1c) / Un If FRun≥1, terminate the diesel generator start command and return to step 1; otherwise, proceed to step 5. Step 5, calculate the Fb value. The specific calculation formula is as follows: Fb=(U2a+U2b+U2c) / Uex If Fb≥1, it indicates that the diesel generator has started successfully, and proceed to step 6; otherwise, calculate the Fb value every Tr time interval until the calculated Fb≥1, and then proceed to step 5. Step 6: The diesel generator startup is now complete. Set S1=1.