CN113162030A - Substation-based spare power automatic switching load sharing method and device and computer equipment - Google Patents
Substation-based spare power automatic switching load sharing method and device and computer equipment Download PDFInfo
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Abstract
The application relates to a substation-based spare power automatic switching load sharing method and device, computer equipment and a storage medium. The method comprises the following steps: collecting a power value of a second main transformer; checking whether the power value of the second main transformer is larger than an overload power fixed value or not; and when the power value of the second main transformer is larger than the overload power fixed value, waiting for the time length of the delay fixed value, and determining the load sharing of the spare power automatic switching device. By adopting the method, the load sharing flexibility can be improved.
Description
Technical Field
The application relates to the technical field of load sharing of a spare power automatic switching device, in particular to a transformer substation-based spare power automatic switching load sharing method and device, computer equipment and a storage medium.
Background
With the development of the load sharing technology of the automatic backup power switching device, the automatic backup power switching device load sharing technology based on the transformer substation is provided to avoid the problem that the main transformer is overloaded due to the device action in the process of switching the automatic backup power switching device to recover the normal power supply after the working power supply is disconnected.
In the traditional technology, the low-voltage side (such as 10KV) backup power automatic switching device is added with load sharing logic, so that the overload of a transformer can be effectively avoided, and the power supply reliability is improved. The long-time overload operation of the transformer can cause the temperature of the transformer to rise, the insulating property of the transformer to be reduced, and the service life of the transformer to be influenced. Before operation, in order to avoid overload operation of each main transformer, a load sharing logic is added to the low-voltage side spare power automatic switching device, and the load sharing pressing plate is added to the spare power automatic switching charging condition.
However, in the traditional method, the load sharing logic is single, the device forcibly shares the load without considering the load level of the main transformer after the device is put into the pressure plate, and the flexibility is low.
Disclosure of Invention
In view of the above, it is necessary to provide a substation-based backup power automatic switching load sharing method, device, computer equipment, and storage medium capable of improving load sharing flexibility.
A spare power automatic switching load sharing method based on a transformer substation comprises the following steps:
the transformer substation primary structure comprises a high-voltage side first bus, a low-voltage side second bus, a low-voltage side third bus and a low-voltage side fourth bus, wherein a first main transformer-down switch and a first main transformer are connected between the high-voltage side first bus and the low-voltage side first bus, and the first main transformer-down switch and the first main transformer are connected in series; a second section switch is connected between the low-voltage side second bus and the low-voltage side first bus, a second main transformer is connected between the low-voltage side second bus and the high-voltage side first bus, and the second main transformer is also connected with the low-voltage side third bus in series; a second main transformer-down switch is connected between the second main transformer and the low-voltage side second bus, a third main transformer-down switch is connected between the second main transformer and the low-voltage side third bus, a first section switch is connected between the low-voltage side third bus and the low-voltage side fourth bus, a third main transformer is connected between the low-voltage side fourth bus and the high-voltage side first bus, and a fourth main transformer-down switch is connected between the third main transformer and the low-voltage side fourth bus; the method comprises the following steps:
collecting a power value of a second main transformer;
checking whether the power value of the second main transformer is larger than an overload power fixed value or not;
and when the power value of the second main transformer is larger than the overload power fixed value, waiting for the time length of the delay fixed value, and determining the load sharing of the spare power automatic switching device.
In one embodiment, when the power value of the second main transformer is greater than the overload power fixed value, waiting for the duration of the delay fixed value to confirm the load sharing of the backup power automatic switching device, includes:
detecting that the power value of the second main transformer is larger than the overload power fixed value;
and waiting for the time of the delay fixed value, when determining that the second main transformer meets the charging operation condition of load sharing, tripping off the first main transformer low-voltage switch, confirming that the first main transformer low-voltage switch is tripped in a separated state, delaying to switch into the first section switch, and confirming that the first section switch is in a closed state, delaying to switch into the second section switch.
In one embodiment, when the power value of the second main transformer is not greater than the overload power value, the backup power automatic switching load sharing is not performed.
In one embodiment, when the power value of the second main transformer is not greater than the overload power value, determining that backup power automatic switching load sharing is not performed includes:
detecting that the power value of the second main transformer is not greater than the overload power fixed value;
and when the second main transformer is determined to meet the charging operation condition of no load sharing, tripping the first main transformer low-voltage switch, and delaying to input the second section switch when the first main transformer low-voltage switch is determined to be in a position-sharing state.
In one embodiment, before checking whether the power value of the second main transformer is greater than the overload power fixed value, the method further includes:
detecting whether a first bus at a low-voltage side is in voltage loss or not and whether a first main transformer low-changing switch has no current or not;
and when the first bus at the low-voltage side is determined to be in voltage loss and the first main transformer low-voltage switch has no current, the step of checking whether the power value of the second main transformer is larger than the overload power fixed value is executed.
In one embodiment, the method further comprises:
collecting the voltage of the first bus at the low-voltage side to obtain a corresponding first voltage amplitude and a corresponding first vector angle, and collecting the voltage of the second bus at the low-voltage side to obtain a corresponding second voltage amplitude and a corresponding second vector angle;
calculating based on the first voltage amplitude and the second voltage amplitude to obtain an amplitude vector difference value, and calculating based on the first vector angle and the second vector angle to obtain an angle vector difference value;
checking whether the angle vector difference value is zero or not and checking whether the amplitude vector difference value is greater than a difference threshold value or not;
and when the angle vector difference is zero and the amplitude vector difference is not greater than a difference threshold value, determining that the first main transformer and the second main transformer belong to the same power supply system, and the low-voltage side first bus and the low-voltage side second bus operate in a loop-closing mode and continue to operate equally according to the spare power automatic switching load.
In one embodiment, when the angle vector difference is not zero and the magnitude vector difference is greater than a difference threshold, it is determined that the first main transformer and the second main transformer do not belong to the same power system, the second main transformer low-voltage switch is tripped, and it is determined that spare power automatic switching load sharing is not performed.
A spare power automatic switching load sharing device based on a transformer substation comprises:
the power value acquisition module is used for acquiring the power value of the second main transformer;
the power value checking module is used for checking whether the power value of the second main transformer is larger than the overload power fixed value or not;
and the load sharing module is used for waiting for the time length of the delay fixed value when the power value of the second main transformer is greater than the overload power fixed value and confirming the load sharing of the backup power automatic switching device.
A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
collecting a power value of a second main transformer;
checking whether the power value of the second main transformer is larger than an overload power fixed value or not;
and when the power value of the second main transformer is larger than the overload power fixed value, waiting for the time length of the delay fixed value, and determining the load sharing of the spare power automatic switching device.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
collecting a power value of a second main transformer;
checking whether the power value of the second main transformer is larger than an overload power fixed value or not;
and when the power value of the second main transformer is larger than the overload power fixed value, waiting for the time length of the delay fixed value, and determining the load sharing of the spare power automatic switching device.
According to the spare power automatic switching load sharing method, device, computer equipment and storage medium based on the transformer substation, when a superior power system of the first main transformer or the third main transformer breaks down, whether the power value of the second main transformer is larger than the overload power value is checked firstly, when the power value of the second main transformer is larger than the overload power value, load sharing is confirmed, and operation is carried out according to the load sharing. The load sharing method and the device do not need to manually switch on or off the pressing plate, and whether load sharing is carried out or not is automatically judged according to the power value of the second main transformer, so that the load function of the low-voltage side spare power automatic switching device is optimized by adding an electric quantity criterion, the load sharing automatic selection function of the spare power automatic switching device is realized, the real-time automatic control and analysis decision function of the integrated transformer substation is facilitated, and the load sharing flexibility can be improved.
Drawings
Fig. 1 is an application environment diagram of a substation-based backup power automatic switching load sharing method in one embodiment;
FIG. 2 is a schematic diagram of the structure and wiring of a high voltage substation in one embodiment;
FIG. 3 is a diagram illustrating an exemplary embodiment of load sharing of the automatic backup power switch;
FIG. 4 is a diagram illustrating another embodiment of the backup power automatic switching device with no load sharing;
FIG. 5 is a schematic flow chart of substation-based backup power automatic switching load sharing in one embodiment;
fig. 6 is a schematic flow chart of substation-based backup power automatic switching load sharing in another embodiment;
fig. 7 is a block diagram of a load sharing device of the backup power automatic switching device based on the transformer substation in one embodiment;
FIG. 8 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The substation-based backup power automatic switching load sharing method can be applied to the application environment shown in fig. 1. The backup power automatic switching device 10 includes a data acquisition module 102 and a load sharing unit 104, where the data acquisition module 102 is configured to acquire a power value of the second main transformer, a voltage and a current on each bus at the low-voltage side, and the load sharing unit 104 is configured to determine whether to perform backup power automatic switching load sharing according to a check result.
Generally, the structure and wiring diagram of a high-voltage (e.g. 110KV on the high-voltage side and 10KV on the low-voltage side) substation is shown in fig. 2, which only illustrates the structures and connections, and thus does not show the on-off state of a specific circuit. The primary structure of the transformer substation comprises a high-voltage side first bus, a low-voltage side second bus, a low-voltage side third bus and a low-voltage side fourth bus, wherein a first main transformer-to-low switch 501 and a first main transformer (#1) are connected between the high-voltage side first bus and the low-voltage side first bus, and the first main transformer-to-low switch 501 and the first main transformer are connected in series; a second section switch 521 is connected between the low-voltage side second bus and the low-voltage side first bus, a second main transformer (#2) is connected between the low-voltage side second bus and the high-voltage side first bus, and the second main transformer is also connected with the low-voltage side third bus in series; a second main transformer low-voltage switch 502 is connected between the second main transformer and the low-voltage side second bus, a third main transformer low-voltage switch 503 is connected between the second main transformer and the low-voltage side third bus, and a first section switch 532 is connected between the low-voltage side third bus and the low-voltage side fourth bus. A third main transformer (#3) is connected between the low-voltage side fourth bus and the high-voltage side first bus, and a fourth main low-voltage switch 504 is connected between the third main transformer and the low-voltage side fourth bus.
The load sharing operation state of the backup power automatic switching device is shown in fig. 3, wherein the black small rectangle represents that the switch is in the on-position state, and the white small rectangle represents that the switch is in the off-position state. It can be seen that first main low-level switch 501 is in a off-position state, second main low-level switch 502, third main low-level switch 503 and fourth main low-level switch 504 are in an on-position state, and first section switch 532 and second section switch 521 are in an on-position state. When the operation logic of the load sharing of the backup power automatic switching device is specifically executed, the first main variable-low switch 501 is firstly tripped, the second section switch 521 is switched in a delayed mode after the first main variable-low switch 501 is confirmed to be in a separated position, and the first section switch 532 is switched in a delayed mode after the second section switch 521 is confirmed to be in a closed position. Before a specific load sharing action of the backup power automatic switching device is executed, whether the following charging operation conditions that four low-voltage side buses (a first low-voltage side bus, a second low-voltage side bus, a third low-voltage side bus and a fourth low-voltage side bus) are all three-phase-voltage and four main-transformer low-change switches (a first main-transformer low-change switch 501, a second main-transformer low-change switch 502, a third main-transformer low-change switch 503 and a fourth main-transformer low-change switch 504) are in an engaged state or not is met is checked. When the above conditions are satisfied simultaneously, the corresponding action logic is executed.
The operation state of the automatic backup power switch without load sharing is shown in fig. 4, wherein a black small rectangle represents that the switch is in the on-position state, and a white small rectangle represents that the switch is in the off-position state. First main step-down switch 501 is in a off-position state, second main step-down switch 502, third main step-down switch 503 and fourth main step-down switch 504 are in an on-position state, first section switch 532 is in an off-position state, and second section switch 521 is in an on-position state. When the operation logic of the load sharing of the backup power automatic switching device is specifically executed, the first main-transformer low-voltage switch 501 is tripped, and the second section switch 521 is switched in a delayed mode after the first main-transformer low-voltage switch 501 is confirmed to be in the shunting position. Before a specific action is executed, whether the following charging operation conditions are met simultaneously or not, namely whether the low-voltage side first bus and the low-voltage side second bus are both three-phase voltage or not, whether the first main transformer low-voltage switch 501, the second main transformer low-voltage switch 502 and the second section switch 521 are all in a closed position, and whether the spare power automatic switching function is put into operation or not are checked. When the above conditions are satisfied simultaneously, the corresponding action logic is executed.
In one embodiment, as shown in fig. 5, a substation-based backup power automatic switching load sharing method is provided, which is described by taking the method as an example for being applied to the terminal in fig. 1, and includes the following steps:
step S502, collecting the power value of the second main transformer.
Step S504, checking whether the power value of the second main transformer is larger than the overload power fixed value.
When the power value of the second main transformer is larger than the overload power fixed value, executing step S506, waiting for the time length of the delay fixed value, and determining the load sharing of the backup power automatic switching device; and when the power value of the second main transformer is not greater than the overload power value, executing step S508 to confirm that the backup power automatic switching load sharing is not executed.
The power value may be a maximum power value of the second main transformer, or may be an effective power value of the second main transformer (the effective power value is an effective value of the maximum power value), and the process of acquiring the power value is real-time and continuous acquisition.
The overload power fixed value can be the maximum power value which can be borne by the second main transformer, and the correspondingly verified power value of the second main transformer is the maximum power value of the second main transformer; the overload power fixed value may also be a maximum effective power value that the second main transformer can bear, and the power value of the correspondingly verified second main transformer is the maximum effective power value of the second main transformer. The delay fixed value is the delay waiting time length and is a fixed value and can be set in the spare power automatic switching device.
Specifically, taking the first main transformer as an example (the third main transformer is the same), when the upper power system fails, the first main transformer becomes disconnected, and if the backup power automatic switching is executed without performing the equipartition operation, the second main transformer carries the low-voltage side first bus, the low-voltage side second bus and the low-voltage side third bus; when the method is executed according to the load sharing operation mode of the spare power automatic switching device, the second main transformer and the third main transformer are provided with a low-voltage side first bus, a low-voltage side second bus, a low-voltage side third bus and a low-voltage side fourth bus together. Compared with the load sharing operation mode, the operation mode without load sharing obviously reduces the load supply capacity of the second main transformer, and has relatively smaller requirement on the power value of the second main transformer. Therefore, when the power value of the second main transformer is larger than the overload power fixed value, the load sharing of the spare power automatic switching device is realized after the set time delay fixed value is long, and the second main transformer is prevented from being overloaded due to the action of the spare power automatic switching device. Before the load of the backup power automatic switching device is equally divided, an electrical quantity criterion (whether the power value of the second main transformer is larger than an overload power fixed value) is added in advance to optimize the load function of the backup power automatic switching device on the low-voltage side. And when the power value of the second main transformer is not more than the overload power value, confirming that the spare power automatic switching load sharing is not executed, wherein the spare power automatic switching load sharing is not executed, and the spare power automatic switching load sharing is not executed, which is the operation state under the common condition when the overload condition does not occur to the second main transformer.
In the spare power automatic switching load sharing method based on the transformer substation, when a superior power system of the first main transformer or the third main transformer breaks down, whether the power value of the second main transformer is larger than the overload power value is checked, and when the power value of the second main transformer is larger than the overload power value, load sharing is confirmed and the load sharing operation is carried out according to the load sharing. The load sharing method and the device do not need to manually switch on or off the pressing plate, and whether load sharing is carried out or not is automatically judged according to the power value of the second main transformer, so that the load function of the low-voltage side spare power automatic switching device is optimized by adding an electric quantity criterion, the load sharing automatic selection function of the spare power automatic switching device is realized, the real-time automatic control and analysis decision function of the integrated transformer substation is facilitated, and the load sharing flexibility can be improved.
In one embodiment, when the power value of the second main transformer is greater than the overload power fixed value, waiting for the time length of the delay fixed value to confirm the load sharing of the backup power automatic switching device, the method includes:
detecting that the power value of the second main transformer is larger than the overload power fixed value; and waiting for the time of the delay fixed value, tripping off the first main transformer low-voltage switch when the second main transformer meets the charging operation condition of load sharing, delaying to input the first section switch when the first main transformer low-voltage switch is tripped to be in a separated state, and delaying to input the second section switch when the first section switch is confirmed to be in a closed state.
Fig. 3 shows a state diagram of the on/off state of each switch when the backup power automatic switching device confirms the load equalization. Before executing a specific load sharing action of the automatic backup power switching device, whether the following charging operation conditions are met is checked, namely that four buses on the low-voltage side have three-phase voltage and four main transformer low-voltage switches are in an on-position state. When the above conditions are satisfied simultaneously, the corresponding action logic is executed. After the charging operation condition and the action condition are met, the first main variable-low switch 501 is tripped off in a delayed mode, the first section switch 532 is switched in a delayed mode when the first main variable-low switch 501 is tripped off in a separated state, and the second section switch 521 is switched in a delayed mode when the first section switch 532 is switched in a closed position.
In this embodiment, the first main transformer low-voltage switch is tripped out by delaying, then the first section switch is switched in by delaying, and then the second section switch is switched in by delaying, so that the load sharing of the backup power automatic switch is realized.
In one embodiment, when the power value of the second main transformer is not greater than the overload power value, confirming that spare power automatic switching load sharing is not performed comprises:
detecting that the power value of the second main transformer is not greater than the overload power fixed value;
and when the second main transformer is determined to meet the charging operation condition of no load sharing, tripping off the first main transformer low-voltage switch, and delaying to input the second section switch when the first main transformer low-voltage switch is determined to be in a separated state.
Fig. 4 shows a state diagram of the on/off positions of the switches when the backup power automatic switching device determines that the loads are not uniform. Before a specific action is executed, whether the following charging operation conditions are met simultaneously or not, namely whether the low-voltage side first bus and the low-voltage side second bus are both three-phase voltage or not, whether the first main transformer low-voltage switch 501, the second main transformer low-voltage switch 502 and the second section switch 521 are all in a closed position, and whether the spare power automatic switching function is put into operation or not are checked. When the above conditions are satisfied simultaneously, the corresponding action logic is executed. When these charging conditions and operating conditions are satisfied at the same time, the first main-section-to-low switch 501 is tripped off with a delay, and the second section-to-low switch 521 is turned on with a delay after the first main-section-to-low switch 501 is determined to be positioned.
In this embodiment, when the first main transformer low-voltage switch is tripped and the first main transformer low-voltage switch is determined to be in the off-position state, the second section switch is switched in a delayed manner, so that the backup power automatic switching is in the non-load sharing operation mode.
In one embodiment, before checking whether the power value of the second main transformer is greater than the overload power fixed value, the method further comprises:
detecting whether a first bus at a low-voltage side is in voltage loss or not and whether a first main transformer low-changing switch has no current or not;
and when the first bus at the low-voltage side is determined to be in voltage loss and the first main transformer low-voltage switch has no current, executing a step of checking whether the power value of the second main transformer is larger than the overload power fixed value.
The voltage and current of the low-voltage side bus are detected by relevant devices through contact measurement, and if the contact fails, the measured voltage and current values are correspondingly not equivalent to the actual values. In this case, the low side first bus voltage loss does not represent that the first main step-down switch 501 switch is not necessarily currentless, and conversely, the first main step-down switch 501 switch is currentless and does not represent that the low side first bus voltage is not necessarily voltage loss. Therefore, the verification result needs to simultaneously satisfy the condition that the first bus at the low-voltage side is in voltage loss and the first main transformer-variable switch has no current, and at the moment, it can be determined that the superior power system of the first main transformer has a fault and the first main transformer-variable switch is in a separated state.
In this embodiment, by detecting and determining that the first bus at the low-voltage side is out of voltage and the first main transformer low-voltage switch has no current, the power verification step of the second main transformer is executed, so as to prevent the backup power automatic switching from being switched to the load sharing operation mode by mistake when the superior power system of the first main transformer or the third main transformer does not actually have a fault.
In one embodiment, the method for load sharing of the backup power automatic switching device based on the transformer substation further comprises the following steps:
the method comprises the steps of collecting the voltage of a first bus at the low-voltage side to obtain a corresponding first voltage amplitude and a corresponding first vector angle, and collecting the voltage of a second bus at the low-voltage side to obtain a corresponding second voltage amplitude and a corresponding second vector angle.
The voltage, the current and the like are vectors, the first voltage amplitude is the voltage absolute value of the low-voltage side first bus, and the second voltage amplitude is the voltage absolute value of the low-voltage side second bus. For example, when the first section switch between the first low-voltage-side bus bar and the second low-voltage-side bus bar is in the off-position state, the current flow directions of the first low-voltage-side bus bar and the second low-voltage-side bus bar are the same, and both the current flows from the high-voltage side to the low-voltage side. If the second section switch is closed at the moment, the second main transformer and the first main transformer are operated in a closed loop mode, namely, the current flows through the first main transformer from the high-voltage side and then flows to the second main transformer through the second section switch. Therefore, the angle of the voltage of the low-voltage side first bus and the angle of the voltage of the low-voltage side second bus are different, and the angle corresponding to the low-voltage side first bus is a first vector angle, and the angle corresponding to the low-voltage side second bus is a second vector angle. The device only needs to collect the voltage of the second bus at the low-voltage side corresponding to the second main transformer and the voltage of the first bus at the low-voltage side corresponding to the first main transformer for comparison, or the voltage of the third bus at the low-voltage side and the voltage of the fourth bus at the low-voltage side for comparison. And determining whether the two sections of buses can be closed-loop operated or not by comparing the amplitude vector difference value with the angle vector difference value.
If the low-voltage side is parallel to the high-voltage side in advance, when the low-voltage bus is closed, if the voltages of the high-voltage sides of the two main transformers have deviation, circulation current is easy to generate, and the transformer is overloaded or equipment is burnt due to serious circulation current. Namely, when the loop is closed between the first bus at the low-voltage side and the second bus at the low-voltage side, if the voltages at the high-voltage sides of the corresponding first main transformer and the corresponding second main transformer have deviation, the loop is easy to circulate; when the loop is closed between the third bus bar at the low-voltage side and the fourth bus bar at the low-voltage side, if the high-voltage sides of the corresponding second main transformer and the corresponding third main transformer have deviation, the loop current is easy to generate.
And calculating based on the first voltage amplitude and the second voltage amplitude to obtain an amplitude vector difference value, and calculating based on the first vector angle and the second vector angle to obtain an angle vector difference value.
Specifically, the formula for calculating the magnitude vector difference is as follows:
Uring closing＝|UX-UY|，
Wherein, URing closingAs magnitude vector difference (in absolute value), UXIs a first voltage amplitude, UYIs a second voltage magnitude.
θRing closing＝|θX-θY|，
Wherein, thetaRing closingAs angle vector difference (absolute)Value form), θXIs a first vector angle, θYIs a second vector angle.
Checking whether the angle vector difference is zero or not and checking whether the amplitude vector difference is greater than a difference threshold or not; when the angle vector difference is zero and the amplitude vector difference is not greater than the difference threshold, determining that the first main transformer and the second main transformer belong to the same power supply system, and the first bus on the low-voltage side and the second bus on the low-voltage side are in closed-loop operation and are evenly divided to continue operation according to the spare power automatic switching load; and when the angle vector difference is not zero and the amplitude vector difference is greater than the difference threshold value, determining that the first main transformer and the second main transformer do not belong to the same power supply system, tripping the second main transformer low-voltage switch, and determining not to perform the load sharing of the backup power automatic switching device.
The difference value threshold is a fixed value but can be set according to field judgment. And when the amplitude vector difference is not greater than the difference threshold value, the high-voltage sides of the first main transformer and the second main transformer belong to the same power supply system.
Specifically, when the angle vector difference is zero and the amplitude vector difference is not greater than the difference threshold, it is indicated that the high-voltage sides corresponding to the first main transformer and the second main transformer belong to the same power supply system, the high-voltage side paralleling is prior to the low-voltage side paralleling, and at this time, the loop closing operation of the first bus at the low-voltage side and the second bus at the low-voltage side does not cause the problem of circulating current. And at the moment, the system can still operate in a spare power automatic switching load sharing mode. If the high-voltage sides corresponding to the first main transformer and the second main transformer are not affiliated to the same power supply system, the low-voltage side is parallel before the high-voltage side, and at the moment, the circulating current problem is caused by the closed-loop operation of the first bus at the low-voltage side and the second bus at the low-voltage side. And when the loop closing operation is judged to be impossible, tripping off a second main transformer low-voltage switch corresponding to the low-voltage side second bus.
In the embodiment, the amplitude vector difference value and the angle vector difference value are obtained and are subjected to verification analysis, so that whether loop closing operation is performed between the first bus at the low-voltage side and the second bus at the low-voltage side is determined, the spare power automatic switching equal division operation mode is continuously executed, and the problem of circulation caused by the fact that the low-voltage side is parallel to the high-voltage side in advance is favorably solved. The electric quantity criterion device for increasing the voltage amplitude and the vector angle can automatically judge whether the low-voltage bus can close the loop to operate. The optimized low-voltage side spare power automatic switching device can be used for automatically analyzing and determining whether to realize load sharing, so that the workload of operation and maintenance personnel is reduced, and the reliability and the continuity of power supply are improved.
In this embodiment, when a failure occurs in the upper power system of the first main transformer or the third main transformer, the load sharing is determined by checking whether the power value of the second main transformer is greater than the overload power value, and when the power value of the second main transformer is greater than the overload power value, the load sharing operation is performed according to the load sharing. The load sharing method and the device do not need to manually switch on or off the pressing plate, and whether load sharing is carried out or not is automatically judged according to the power value of the second main transformer, so that the load function of the low-voltage side spare power automatic switching device is optimized by adding an electric quantity criterion, the load sharing automatic selection function of the spare power automatic switching device is realized, the real-time automatic control and analysis decision function of the integrated transformer substation is facilitated, and the load sharing flexibility can be improved.
In one embodiment, the method for load sharing of the spare power automatic switching device based on the transformer substation comprises the following steps:
step S602, collecting a power value of a second main transformer;
step S604, detecting whether the first bus at the low-voltage side is in voltage loss or not and whether the first main transformer low-change switch has no current or not;
step S606, determining that the first bus at the low-voltage side is in voltage loss and the first main transformer low-change switch has no current;
step S608, checking whether the power value of the second main transformer is larger than the overload power fixed value;
when the power value of the second main transformer is larger than the overload power fixed value, executing step S610, waiting for the time length of the delay fixed value, and determining the load sharing of the backup power automatic switching device;
when the power value of the second main transformer is not greater than the overload power value, step S612 is executed to confirm that the backup power automatic switching load sharing is not executed.
In this embodiment, when a failure occurs in the upper power system of the first main transformer or the third main transformer, the load sharing is determined by checking whether the power value of the second main transformer is greater than the overload power value, and when the power value of the second main transformer is greater than the overload power value, the load sharing operation is performed according to the load sharing. The load sharing method and the device do not need to manually switch on or off the pressing plate, and whether load sharing is carried out or not is automatically judged according to the power value of the second main transformer, so that the load function of the low-voltage side spare power automatic switching device is optimized by adding an electric quantity criterion, the load sharing automatic selection function of the spare power automatic switching device is realized, the real-time automatic control and analysis decision function of the integrated transformer substation is facilitated, and the load sharing flexibility can be improved.
It should be understood that, although the steps in the flowcharts related to the above embodiments are shown in sequence as indicated by the arrows, the steps are not necessarily executed in sequence as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in each flowchart related to the above embodiments may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least a part of the steps or stages in other steps.
In one embodiment, as shown in fig. 7, there is provided a substation-based backup power automatic switching load sharing device, including: a power value collection module 702, a power value verification module 704 and a load sharing module 706, wherein:
a power value collecting module 702, configured to collect a power value of the second main transformer;
a power value checking module 704, configured to check whether a power value of the second main transformer is greater than the overload power fixed value;
and a load sharing module 706, configured to wait for a time duration of the delay fixed value when the power value of the second main transformer is greater than the overload power fixed value, and determine load sharing of the backup power automatic switching device.
In one embodiment, the load sharing module is further configured to, when detecting that the power value of the second main transformer is greater than the overload power fixed value;
and waiting for the time of the delay fixed value, tripping off the first main transformer low-voltage switch when the second main transformer meets the charging operation condition of load sharing, delaying to input the first section switch when the first main transformer low-voltage switch is tripped to be in a separated state, and delaying to input the second section switch when the first section switch is confirmed to be in a closed state.
In one embodiment, the load sharing module is further configured to determine that the backup power automatic switching load sharing is not performed when the power value of the second main transformer is not greater than the overload power value; wherein, include: detecting that the power value of the second main transformer is not greater than the overload power fixed value; and when the second main transformer is determined to meet the charging operation condition of no load sharing, tripping off the first main transformer low-voltage switch, and delaying to input the second section switch when the first main transformer low-voltage switch is determined to be in a separated state.
In one embodiment, the load sharing device for the automatic backup power switching device based on the transformer substation further comprises:
the voltage and current detection module is used for detecting whether the first bus at the low-voltage side is in voltage loss or not and whether the first main transformer low-voltage switch is in no current or not; and when the first bus at the low-voltage side is determined to be in voltage loss and the first main transformer low-voltage switch has no current, executing a step of checking whether the power value of the second main transformer is larger than the overload power fixed value.
In one embodiment, the load sharing device for the automatic backup power switching device based on the transformer substation further comprises:
the voltage amplitude and vector angle acquisition module is used for acquiring the voltage of a first bus at the low-voltage side to obtain a corresponding first voltage amplitude and a corresponding first vector angle, and acquiring the voltage of a second bus at the low-voltage side to obtain a corresponding second voltage amplitude and a corresponding second vector angle;
the amplitude vector difference value and angle vector difference value acquisition module is used for calculating based on the first voltage amplitude value and the second voltage amplitude value to obtain an amplitude vector difference value, and calculating based on the first vector angle and the second vector angle to obtain an angle vector difference value;
the amplitude vector difference and angle vector difference checking module is used for checking whether the angle vector difference is zero or not and checking whether the amplitude vector difference is greater than a difference threshold or not;
the load sharing determination module is used for determining that the first main transformer and the second main transformer belong to the same power supply system, the first bus at the low-voltage side and the second bus at the low-voltage side run in a loop closing mode and continue running according to the load sharing of the spare power automatic switching device when the angle vector difference value is zero and the amplitude vector difference value is not greater than the difference threshold value;
and when the angle vector difference is not zero and the amplitude vector difference is greater than the difference threshold value, determining that the first main transformer and the second main transformer do not belong to the same power supply system, tripping the second main transformer low-voltage switch, and determining not to perform the load sharing of the backup power automatic switching device.
For specific limitations of the substation-based backup power automatic switching load sharing device, reference may be made to the above limitations of the substation-based backup power automatic switching load sharing method, and details are not described here. All modules in the substation-based automatic bus transfer load balancing device can be completely or partially realized through software, hardware and a combination of the software and the hardware. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 8. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to realize a substation-based spare power automatic switching load sharing method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 8 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is further provided, which includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method embodiments when executing the computer program.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A spare power automatic switching load equipartition method based on a transformer substation is characterized in that a primary structure of the transformer substation comprises a high-voltage side first bus, a low-voltage side second bus, a low-voltage side third bus and a low-voltage side fourth bus, wherein a first main transformer-down switch and a first main transformer are connected between the high-voltage side first bus and the low-voltage side first bus, and the first main transformer-down switch and the first main transformer are connected in series; a second section switch is connected between the low-voltage side second bus and the low-voltage side first bus, a second main transformer is connected between the low-voltage side second bus and the high-voltage side first bus, and the second main transformer is also connected with the low-voltage side third bus in series; a second main transformer-down switch is connected between the second main transformer and the low-voltage side second bus, a third main transformer-down switch is connected between the second main transformer and the low-voltage side third bus, a first section switch is connected between the low-voltage side third bus and the low-voltage side fourth bus, a third main transformer is connected between the low-voltage side fourth bus and the high-voltage side first bus, and a fourth main transformer-down switch is connected between the third main transformer and the low-voltage side fourth bus; the method comprises the following steps:
collecting a power value of a second main transformer;
checking whether the power value of the second main transformer is larger than an overload power fixed value or not;
and when the power value of the second main transformer is larger than the overload power fixed value, waiting for the time length of the delay fixed value, and determining the load sharing of the spare power automatic switching device.
2. The method of claim 1, wherein when the power value of the second main transformer is greater than the overload power setting value, waiting for a time delay setting duration to confirm backup power switching load sharing, comprises:
detecting that the power value of the second main transformer is larger than the overload power fixed value;
and waiting for the time of the delay fixed value, when determining that the second main transformer meets the charging operation condition of load sharing, tripping off the first main transformer low-voltage switch, confirming that the first main transformer low-voltage switch is tripped in a separated state, delaying to switch into the first section switch, and confirming that the first section switch is in a closed state, delaying to switch into the second section switch.
3. The method according to claim 1, wherein when the power value of the second main transformer is not greater than the overload power value, it is determined that backup power switching load sharing is not performed.
4. The method of claim 3, wherein confirming that backup power switching load sharing is not performed when the power value of the second main transformer is not greater than the overload power value comprises:
detecting that the power value of the second main transformer is not greater than the overload power fixed value;
and when the second main transformer is determined to meet the charging operation condition of no load sharing, tripping the first main transformer low-voltage switch, and delaying to input the second section switch when the first main transformer low-voltage switch is determined to be in a position-sharing state.
5. The method of claim 1, further comprising, prior to verifying whether the power value of the second main transformer is greater than the overload power setpoint:
detecting whether a first bus at a low-voltage side is in voltage loss or not and whether a first main transformer low-changing switch has no current or not;
and when the first bus at the low-voltage side is determined to be in voltage loss and the first main transformer low-voltage switch has no current, the step of checking whether the power value of the second main transformer is larger than the overload power fixed value is executed.
6. The method of claim 1, further comprising:
collecting the voltage of the first bus at the low-voltage side to obtain a corresponding first voltage amplitude and a corresponding first vector angle, and collecting the voltage of the second bus at the low-voltage side to obtain a corresponding second voltage amplitude and a corresponding second vector angle;
calculating based on the first voltage amplitude and the second voltage amplitude to obtain an amplitude vector difference value, and calculating based on the first vector angle and the second vector angle to obtain an angle vector difference value;
checking whether the angle vector difference value is zero or not and checking whether the amplitude vector difference value is greater than a difference threshold value or not;
and when the angle vector difference is zero and the amplitude vector difference is not greater than a difference threshold value, determining that the first main transformer and the second main transformer belong to the same power supply system, and the low-voltage side first bus and the low-voltage side second bus operate in a loop-closing mode and continue to operate equally according to the spare power automatic switching load.
7. The method of claim 6 wherein when said angle vector difference is not zero and said magnitude vector difference is greater than a difference threshold, determining that said first main transformer and said second main transformer do not belong to the same power system, tripping said second main transformer low switch, and determining that no backup power switching load sharing is performed.
8. The utility model provides a spare power automatic switching load equipartition device based on transformer substation which characterized in that, the device includes:
the power value acquisition module is used for acquiring the power value of the second main transformer;
the power value checking module is used for checking whether the power value of the second main transformer is larger than the overload power fixed value or not;
and the load sharing module is used for waiting for the time length of the delay fixed value when the power value of the second main transformer is greater than the overload power fixed value and confirming the load sharing of the backup power automatic switching device.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
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