Power Grid Equipment Fault Trip Loss Load Analysis System Based on Electrical Island Topology

Abstract

The present invention relates to a power grid equipment accident tripping loss load analysis system based on electrical island topology, comprising an electrical island topology analysis unit, an electrical island live analysis unit, a busbar load calculation unit, and an equipment loss load calculation unit. The electrical island topology analysis unit is used to identify electrical island splits and establish a correlation between electrical island splits and switch actions. The electrical island live analysis unit is used to determine electrical island voltage loss and determine the range of voltage-loss equipment. The busbar load calculation unit is used to calculate the loss load of the busbar due to voltage loss. The equipment loss load calculation unit is used to calculate the total loss load of equipment failures. The present invention achieves accurate calculation of the loss load caused by power grid equipment accident tripping.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid operation and maintenance, and in particular to a power grid equipment accident tripping loss load analysis system based on electrical island topology. Background Art

[0002] During operation, power grid equipment may trip due to equipment failures, lightning strikes, or foreign objects, resulting in localized load loss. To ensure stable grid operation and minimize load losses caused by power outages, power systems are equipped with automatic backup power supply (ABPS) devices. These devices automatically transfer loads when power outages occur. The total load within the outage area after load transfer is called the loss load, a key indicator for assessing the severity of power grid events. Currently, calculation of loss load suffers from three major issues: First, data collection delays prevent the precise location of the voltage loss area; second, after the APS device shifts some load, the precise determination of the voltage loss range caused by the equipment failure is difficult; and third, the data collected by the master station, such as grid equipment status and measurement values, cannot be time-sequenced. Consequently, the load on the equipment may have already returned to zero when voltage loss is determined, making it impossible to calculate the loss load.

[0003] Traditional power monitoring systems lack effective means to analyze load losses caused by power grid equipment tripping accidents in a refined manner. When analyzing equipment power outages, the first thing that happens is that the electrical topology island is split due to the separation of switchgear. When there is no power supply on the island or the power supply is insufficient to maintain power balance on the island, the busbar on the island loses voltage, which in turn determines that the equipment on the topology island has lost power. Summary of the Invention

[0004] In view of this, the object of the present invention is to provide a power grid equipment accident tripping loss load analysis system based on electrical island topology, aiming to solve the above problems.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A power grid equipment accident tripping loss load analysis system based on electrical island topology includes an electrical island topology analysis unit, an electrical island live analysis unit, a busbar load calculation unit, and an equipment loss load calculation unit; the electrical island topology analysis unit is used to identify electrical island splits and establish a correlation between electrical island splits and switch actions; the electrical island live analysis unit is used to determine electrical island voltage loss and determine the range of voltage-loss equipment; the busbar load calculation unit is used to calculate the loss load of the voltage-loss bus; and the equipment loss load calculation unit is used to calculate the total loss load of equipment failures.

[0007] Furthermore, the electrical island topology analysis unit performs electrical island topology analysis: when a switch device is displaced, the electrical island where the device is located is automatically triggered to re-analyze the topology; when the electrical island is split into two, the switch device that caused the electrical island split is automatically recorded. The specific steps are as follows:

[0008] (1) When the switchgear is opened or closed, the electrical island topology analysis on both sides of the equipment is automatically triggered, a new electrical island is generated, and the original electrical island information is deleted;

[0009] (2) When the switch device is closed, the electrical island where the device is located is automatically triggered to re-analyze the topology. If the electrical island is split into two or more, it is considered that one of the electrical islands may experience a power outage, and the switch that caused the topology to split is recorded, and the switch change time is also recorded;

[0010] (3) Automatically detect the switch change time that causes the topology island to split. When the switch change time exceeds the threshold, the switch information that causes the topology island change is automatically released to avoid affecting the next fault analysis.

[0011] Furthermore, the electrical island power analysis unit performs power analysis on the electrical island: when there is a generator set in the electrical island and the output of the generator set is not zero and the bus voltage in the topology island is at a reasonable value, the current topology island is considered to be powered; otherwise, the current electrical island is considered to be unpowered, and all devices in the electrical island are pressure-loss devices. The specific steps are as follows:

[0012] (1) Detect whether the busbar energized state has changed based on the busbar voltage value. When the busbar voltage changes from a reasonable value to an unreasonable value, the busbar is considered to be de-energized. Otherwise, the busbar is considered to be energized. When the busbar energized state changes, the electrical island where the busbar is located is automatically started to recalculate the energized state. When the electrical island energized state changes from energized to de-energized, the equipment in the electrical island is determined to be a pressure-depleted equipment and pushed to the equipment state change queue;

[0013] (2) Detect whether the generator's energized state has changed based on the generator's active power value. If the generator's active power is less than the zero drift value, it is considered to be de-energized. Otherwise, it is considered to be energized. When the generator's energized state changes, the electrical island where the generator is located is automatically started to recalculate the energized state. When the energized device in the electrical island changes from energized to de-energized, the equipment in the electrical island is determined to be a pressure-depleted device and pushed to the equipment state change queue.

[0014] (3) Automatically detect the equipment status change queue. When the equipment recovers to the previous state within the specified time, the equipment will be cleared from the equipment status change queue. When the equipment status does not recover within the specified time and the equipment is a pressure-loss device, the equipment will be pushed to the equipment loss load calculation unit.

[0015] Furthermore, the busbar load calculation unit regularly establishes a busbar load association model based on the real-time topological connection relationship of the equipment, and performs a total calculation based on the load value to obtain the busbar load value. When the load value exceeds the zero drift value, the data is considered valid and the busbar's last effective load value is updated, as follows:

[0016] (1) When the load value carried by the bus exceeds the zero drift value, set the bus's last effective load value and load change time;

[0017] (2) When the load value carried by the bus is less than the zero drift value, if the change time of the last effective load value of the bus exceeds the preset threshold, the last effective load value is considered to be invalid and the last effective load value of the bus is set to 0; if the change time of the last effective load value of the bus does not exceed the preset threshold, no processing is performed.

[0018] Furthermore, the equipment loss load calculation unit performs equipment loss load calculation as follows: automatically carrying the action switch that causes the equipment power outage, and determining the scope of the power outage caused by the equipment failure based on whether the switch device is included in the pressure loss equipment tripping judgment condition; if it is determined that the equipment pressure loss is caused by the fault, the last effective load value of the busbar is used as the loss load, and a total calculation is performed, and the total calculation result is the loss load value of the faulty equipment.

[0019] Furthermore, the equipment loss load calculation unit determines whether the switch causing the equipment power outage is in a certain grid fault action switch sequence. If it is in the action switch sequence, it means that it is caused by the equipment failure. Otherwise, it is considered not to be caused by the equipment failure and is not included in the loss load calculation.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention realizes the accurate calculation of the loss load caused by the tripping of the power grid equipment fault accident, can identify the switchgear that causes the electrical island to split, and when the electrical island after the split loses pressure, the switchgear is identified as the pressure loss range caused by the accident tripping of the power grid equipment; secondly, according to the power supply path of the power grid, when the standby automatic transfer action switch and the protection outlet action switch are actuated, it is avoided that the standby automatic transfer action switch is mistakenly identified as the switch that causes the topological island to split, which affects the association between the pressure loss range and the faulty equipment; thirdly, the load carried by the low-voltage bus is calculated, and the last effective value of the load carried by the bus is recorded and identified as the loss load on the bus, and the loss load of the power grid equipment accident tripping is calculated according to the load loss of each pressure-loss bus. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a calculation flow chart of each unit of the system of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Please refer to Figure 1 The present invention provides a power grid equipment accident tripping loss load analysis system based on electrical island topology, comprising an electrical island topology analysis unit, an electrical island energized analysis unit, a busbar load calculation unit and an equipment loss load calculation unit; the electrical island topology analysis unit is used to identify electrical island splitting and establish a correlation between electrical island splitting and switch action; the electrical island energized analysis unit is used to judge electrical island pressure loss and determine the range of pressure-loss equipment; the busbar load calculation unit is used to calculate the pressure loss load of the pressure-loss bus; the equipment loss load calculation unit is used to calculate the total loss load of equipment failure.

[0025] In this embodiment, the electrical island topology analysis unit performs an electrical island topology analysis process as follows:

[0026] (1) Start the real-time data receiving thread to receive the switch status, busbar, generator, load and other real-time measurement values from the control system real-time data center;

[0027] (2) Circularly detect the received real-time data. If it is switch position change data, trigger the re-topology of the topology island where the switch is located. If it is bus or generator measurement change data, switch to the electrical island energized analysis process. If it is load measurement data, switch to the bus load calculation process.

[0028] (3) Re-topology the topological island where the switch is located. When the switch is opened or closed, the topological island will not be split. The topological island can be directly analyzed with power on. If the switch is closed or opened, the topological island where the switch is located should be re-analyzed to determine whether the electrical island topology is split into two islands. Only when the electrical island is split into two or more electrical islands will power outage occur.

[0029] (4) Detect whether the electrical island is split into two or more electrical islands after the re-topology is re-established. If the topology island is not split, directly switch to the electrical island live analysis. If the topology island is split, further determine the switch information that causes the electrical island split.

[0030] (5) Determine whether the switch that caused the electrical island to split already exists in the electrical island after the split. If not, directly update the switch that caused the electrical island to split to the current position switch. If it exists, further determine the switch priority;

[0031] (6) The priority of the current position switch is determined according to the principle of high voltage level first. If the voltage level of the current position switch is high, or the voltage levels of the switches are the same but the voltage level of the plant where the current position switch is located is higher, the current switch priority is determined to be higher;

[0032] (7) When the priority of the current position switch is high, the electrical island causing the split switch is updated to the current position switch; when the priority of the current position switch is low, the electrical island live analysis unit is started;

[0033] (8) After the electrical island causing the split switch is updated, start the electrical island live analysis unit.

[0034] In this embodiment, the electrical island live analysis unit performs the electrical island live analysis process as follows:

[0035] (1) When the bus voltage or generator set measurement changes, it is first updated to the local memory model;

[0036] (2) Based on the reasonable value of the bus voltage and the active power value of the generator, determine whether the energized state of the bus and the generator set has changed. If no change has occurred, directly return to the electrical island topology analysis process and continue to receive real-time data;

[0037] (3) When the energized state of the busbar or generator set changes, start the energized analysis of the electrical island;

[0038] (4) Based on the results of the electrical island power analysis, update the power status of all equipment in the electrical island and detect changes in the power status of the equipment;

[0039] (5) When a power outage occurs on a device, a power outage event is generated, and the switch that caused the electrical island split is used as the switch that caused the power outage. The power outage event is pushed to the power outage event cache queue. After the power outage event is determined, the process returns to the electrical island topology analysis process.

[0040] (6) When the device is powered on, a device power-on event is generated and a check is made to see if there is an unpublished power-off event in the power-off event cache queue. If there is, it means that the device is powered on within the delay event and the power-off event is not pushed.

[0041] In this embodiment, the busbar load calculation unit performs a busbar load calculation process as follows:

[0042] (1) When the active value of the load device changes, determine whether the active value of the load device has returned to zero. If the active value has not returned to zero, directly assign it to the local memory as the effective value, and record the current value as the last effective value. When the active value returns to zero, it is necessary to further determine the time when the effective value was last received.

[0043] (3) After the active value returns to zero, check the time when the last non-zero value was received. If the time exceeds the threshold (30 seconds), it is considered that the current accident analysis has been completed and the last effective value has exceeded the effective recording time. To avoid affecting the next analysis, set the last effective value of active power to 0; if there is no timeout, search the bus to which the load is connected and automatically trigger the calculation of the load value carried by the bus.

[0044] In this embodiment, the equipment loss load calculation unit performs the equipment loss load calculation process as follows:

[0045] (1) Start the loss load calculation thread, cyclically receive equipment fault tripping details data, and record it in the local cache queue;

[0046] (2) Circularly detect the power outage event cache queue and determine whether the power outage event has timed out, that is, exceeded the delayed push time;

[0047] (3) After determining that the power outage event has timed out, determine whether the switch that caused the power outage is in the equipment fault action switch sequence. If so, further calculation is performed based on the equipment type; if not, the power outage queue is entered to determine whether the traversal is completed;

[0048] (4) If the outage device is a busbar device, the last effective load carried by the busbar is added to the loss load of the tripped device; if the outage device is a non-busbar device, the outage queue is entered to determine whether the traversal is completed;

[0049] (5) Push device power outage events;

[0050] (6) Check whether the traversal of the power outage queue is completed. If not, continue to traverse and process the power outage equipment. If the traversal is completed, return to the loop to receive the accident tripping details data.

[0051] In this embodiment, in particular, the equipment loss load calculation process is mainly based on whether the switch that causes the equipment power outage is in a certain grid fault action switch sequence. If it is in the action switch sequence, it means that it is caused by the equipment failure. Otherwise, it is considered not to be caused by the equipment failure and is not included in the loss load calculation.

[0052] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A power grid equipment accident tripping loss load analysis system based on electrical island topology, characterized in that: It includes an electrical island topology analysis unit, an electrical island energized analysis unit, a busbar load calculation unit, and an equipment loss load calculation unit; the electrical island topology analysis unit is used to identify electrical island splits and establish a correlation between electrical island splits and switch actions; the electrical island energized analysis unit is used to determine electrical island voltage loss and determine the range of voltage-loss equipment; the busbar load calculation unit is used to calculate the loss load of the voltage-loss bus; the equipment loss load calculation unit is used to calculate the total loss load of equipment failure; The electrical island topology analysis unit performs electrical island topology analysis: when a switch device or a knife switch device is displaced, the electrical island where the device is located is automatically triggered to re-analyze the topology; when the electrical island is split into two, the switch device that caused the electrical island to split is automatically recorded. The specific steps are as follows: (1) When the switchgear is opened or closed, the electrical island topology analysis on both sides of the equipment is automatically triggered, a new electrical island is generated, and the original electrical island information is deleted; (2) When a switch device is switched on or off, the electrical island where the device is located is automatically triggered to re-analyze the topology. If the electrical island is split into multiple islands, it is considered that one of the electrical islands may experience a power outage, and the switch that caused the topology to split is recorded, and the switch change time is also recorded; (3) Automatically detect the switch change time that causes the topology island to split. When the switch change time exceeds the threshold, the switch information that causes the topology island change is automatically released to avoid affecting the next fault analysis; The electrical island power analysis unit performs electrical island power analysis: when there is a generator set in the electrical island and the output of the generator set is not zero and the bus voltage in the topology island is at a reasonable value, the current topology island is considered to be powered; otherwise, the current electrical island is considered to be unpowered, and all devices in the electrical island are pressure-depleted devices. The specific steps are as follows: (1) Detect whether the busbar energized state has changed based on the busbar voltage value. When the busbar voltage changes from a reasonable value to an unreasonable value, the busbar is considered to be de-energized. Otherwise, the busbar is considered to be energized. When the busbar energized state changes, the electrical island where the busbar is located is automatically started to recalculate the energized state. When the electrical island energized state changes from energized to de-energized, the equipment in the electrical island is determined to be a pressure-depleted equipment and pushed to the equipment state change queue; (2) Detect whether the generator's energized state has changed based on the generator's active power value. If the generator's active power is less than the zero drift value, it is considered to be de-energized. Otherwise, it is considered to be energized. When the generator's energized state changes, the electrical island where the generator is located is automatically started to recalculate the energized state. When the energized device in the electrical island changes from energized to de-energized, the equipment in the electrical island is determined to be a pressure-depleted device and pushed to the equipment state change queue. (3) Automatically detect the equipment status change queue. When the equipment recovers to the previous state within the specified time, the equipment will be cleared from the equipment status change queue. When the equipment status does not recover within the specified time and the equipment is a pressure-loss device, the equipment will be pushed to the equipment loss load calculation unit.

2. The power grid equipment accident tripping loss load analysis system based on electrical island topology according to claim 1 is characterized in that: The busbar load calculation unit regularly establishes a busbar load association model based on the real-time topological connection relationship of the equipment, and performs a total calculation based on the load value to obtain the busbar load value. When the load value exceeds the zero drift value, the data is considered valid and the last effective busbar load value is updated, as follows: (1) When the load value carried by the bus exceeds the zero drift value, set the bus's last effective load value and load change time; (2) When the load value carried by the bus is less than the zero drift value, if the change time of the last effective load value of the bus exceeds the preset threshold, the last effective load value is considered to be invalid and the last effective load value of the bus is set to 0; if the change time of the last effective load value of the bus does not exceed the preset threshold, no processing is performed.

3. The power grid equipment accident tripping loss load analysis system based on electrical island topology according to claim 1 is characterized in that: The equipment loss load calculation unit performs equipment loss load calculation as follows: automatically carries the action switch that causes the equipment power outage, and determines the scope of the power outage caused by the equipment failure based on whether the action switch that causes the equipment power outage is included in the pressure loss equipment tripping judgment condition. If it is determined that the equipment pressure loss is caused by the fault, the last effective load value of the bus is used as the loss load, and a total addition calculation is performed. The total addition calculation result is the loss load value of the faulty equipment.

4. The power grid equipment accident tripping loss load analysis system based on electrical island topology according to claim 3 is characterized in that: The equipment loss load calculation unit determines whether the switch causing the equipment power outage is in a certain grid fault action switch sequence. If it is in the action switch sequence, it means that the failure is caused by the equipment failure. Otherwise, it is considered not to be caused by the equipment failure and is not included in the loss load calculation.

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