An Optimization Method for the Global Coordination Control Architecture under Emergency Conditions of a Distribution Network

Abstract

The present invention discloses an optimization method for the global coordination control architecture under the emergency state of a distribution network. In order to overcome the problem in the prior art that when an emergency occurs during the operation of the power grid, major problems are faced with delayed processing, a method is provided for dividing priorities between the unconventional state and the emergency state, which can screen out the emergency state from among many situations and give priority to its processing.

Description

Technical Field

[0001] The present invention relates to the field of coordinated control of distribution networks, and particularly to an optimization method for the global coordinated control architecture under emergency conditions of distribution networks. Background Art

[0002] When distribution networks are under extreme natural conditions or operating errors, emergency situations that are difficult to respond to in a timely manner often occur. Currently, for sudden emergency situations in the power grid, the method of dealing with them as they occur first is often adopted. Therefore, it is easy to delay the handling of major problems, which is not conducive to the overall recovery rate of the power grid.

[0003] An "Elastic Distribution Network Post-disaster Emergency Response Operation Control System and Method" disclosed in a Chinese patent document, with the publication number CN111555282A, includes judging whether there are parts of the distribution network that do not meet the normal operating conditions or are passive after the disaster according to the post-disaster fault conditions of the distribution network, and transferring the nearest mobile energy storage system in the distribution network to provide electric energy for the part of the distribution network that has lost power; at the same time, based on the joint optimization of the electric-gas integrated energy network, using gas turbines to provide electric energy for the distribution network, and the joint emergency response of the mobile energy storage system and the gas turbine increases the power supply for the restored load. This solution provides specific recovery steps for the power grid under emergency conditions, but lacks the recovery sequence for different types of emergencies, which may lead to the situation where simple problems are dealt with first and important problems are not in time for handling. Summary of the Invention

[0004] The present invention mainly solves the problem that major problems are delayed in handling when the power grid encounters emergency situations during operation in the prior art; and provides a method for dividing priorities between unconventional states and emergency states, which can screen out emergency states from numerous states and give priority to handling them.

[0005] The above technical problems of the present invention are mainly solved by the following technical solutions:

[0006] The present invention includes the following steps: establishing a global coordinated control architecture under emergency conditions of the power grid, dividing the operating states of the power grid, performing periodic monitoring on each state, performing priority evaluation on each operating state of the power grid, and formulating an optimization method for the global coordinated control architecture in each operating state according to the priority order.

[0007] Preferably, the global coordinated control architecture includes: a monitoring layer responsible for monitoring the overall operating state of the power grid and performing periodic monitoring and zoning detection according to the operating state; an access layer responsible for guiding the power grid to automatically access the control layer when a communication failure occurs in the power grid and transmitting signals to the control layer; an emergency situation handling layer responsible for transmitting information to the control layer when an emergency situation occurs and guiding the power grid to automatically access the control layer; and a control layer responsible for receiving regulation instructions, analyzing the instructions and controlling the overall operation of the power grid.

[0008] Preferably, according to the operation conditions of the power grid, the following power grid operation states are set: unconventional state, emergency state, repair state, and normal operation state; in the normal operation state, the power grid consumes energy normally and no crisis events occur during the operation of the power grid; in the unconventional state, the power grid has excessive energy consumption resulting in insufficient energy storage, or serious crisis events that may damage the power grid occur during the operation of the power grid; in the emergency state, inevitable crisis events occur during the operation of the power grid and have caused a certain degree of damage to the power grid.

[0009] Preferably, a priority assessment is made for each operation state of the power grid. The specific priority settings are as follows: level C is the normal operation state, level B is the recovery state, level A is the unconventional state, and level S is the emergency state. The priority increases gradually from C to S, where S is the highest priority; setting priorities for operation states facilitates monitoring the power grid state in descending order of priority during periodic monitoring, so as to preferentially judge and solve possible crisis events in the power grid.

[0010] Preferably, the control architecture scheduling and state transformation in the unconventional state include the following: detecting the current operation state of the power grid, detecting in the order of priority. First, judge whether the power grid is in the emergency state. If not, then judge whether the power grid is in the unconventional state. If the power grid is in the unconventional state, set the unconventional state level. The state level increases successively from unconventional levels 0 - 3. Among them, a level greater than or equal to 2 is a high-level unconventional state. Feedback the A2 level information to the control layer and perform a repair operation. After the repair, judge whether it has entered the normal operation state. If it is in the normal operation state, end the loop; otherwise, continue the repair judgment. If the state level is less than 2, send an A1 signal to the control layer and transfer to the first repair state. After the repair is completed, return to the initial detection state and re-detect the operation state of the power grid.

[0011] Preferably, the control scheduling and state transformation in the emergency state include the following: judging in order of priority whether the power grid is in the emergency state. If it is in the emergency state, feedback the S-level state information to the control layer, and be guided by the emergency handling layer into the control layer and enter the repair state of the emergency state. Allocate resources for repair. If a resource conflict or other reasons cause the repair to be interrupted during the repair process, jump back to the previous step and start the repair again. After one round of repair is completed, enter the unconventional state. At this time, detect the unconventional level and feedback the level information to the control layer, and perform a secondary repair. After the secondary repair, conduct a normal operation state inspection. If it becomes the normal operation state, end the loop; if it is not the normal operation state, continue the loop repair detection process.

[0012] Preferably, the scheduling content in the repair state includes: setting a repair cycle X. When the power grid transitions from the emergency state to the repair state, allocate the repair resources required for one cycle X for it, additionally reserve the repair resources required for two cycles X, and then return to the detection state. After the repair is completed, release all allocated resources. If the power grid transitions from an abnormal state to the repair state, judge the state level. If the level is A1, allocate the repair resources required for one cycle X for it. If the level is A2, allocate the resources required for one cycle X for it, and then additionally reserve the repair resources required for one cycle X. At the beginning of the repair cycle, send a B+ signal to the control layer, and send a B- signal to the control layer at the end, and wait for the inspection of the repair result.

[0013] Preferably, the judgment and scheduling in the normal operation state include the following content: sequentially detect according to the priority, judge whether the power grid is in the emergency state. If it is not in the emergency state, judge whether the power grid is in the abnormal state. If not, judge whether the power grid is in the normal operation state. If it is in the normal operation state, set a detection cycle T, and continuously detect the power grid state with T as the cycle until an emergency state or an abnormal state appears.

[0014] The beneficial effects of the present invention are as follows: It can distinguish and process emergency situations and abnormal states, and accelerate the rate of the power grid to handle emergency situations; classify and process the priorities of various operating states to achieve the effect of handling emergency situations first and reducing power grid losses; set different repair cycles for the recovery states of the emergency state and the abnormal state respectively to ensure that the emergency situation can be fully repaired and maintain the safe operation of the power grid. Description of the Drawings

[0015] Figure 1 It is a flowchart of the operation of a global coordination control architecture of the present invention. Detailed Embodiment

[0016] Next, through embodiments and in combination with the drawings, the technical solutions of the present invention will be further specifically described.

[0017] Embodiment:

[0018] An optimization method for a global coordination control architecture in an emergency state of a distribution network in this embodiment is as Figure 1 shown, and includes the following steps.

[0019] Step 1: Establish a global coordinated control architecture for the power grid in an emergency state, and set up a monitoring layer, an access layer, an emergency handling layer, and a control layer. The monitoring layer is responsible for monitoring the overall operation status of the power grid and feeding back the monitoring results to the control layer. The access layer is responsible for controlling the power grid to automatically access the control layer in case of communication failures to prevent the power grid from being unable to handle operation situations properly. The emergency handling layer is responsible for controlling the power grid to automatically access the control layer and sending signals to the control layer when an emergency occurs in the power grid. The control layer is responsible for scheduling the operation of the entire architecture and controlling the allocation of restoration resources.

[0020] Step 2: Divide the operation status of the power grid, including normal operation status, abnormal status, emergency status, and restoration status. After dividing the statuses, set priority signals for each status and send corresponding signals to the control layer in such statuses. The priority settings include: the normal operation status has a priority setting of C, and sends a C signal to the control layer, indicating that the power grid is operating normally and can enter the next detection cycle. The abnormal status has a priority setting of A, and in this status, signals A1 or A2 are sent to the control layer according to the abnormal attributes, indicating that there are operation problems in the power grid, where A1 represents a less serious problem and A2 represents a more serious problem. The emergency status has a priority setting of S, and sends an S signal to the control layer to indicate that the power grid is in a serious situation and must be given priority for handling. The restoration status has a priority setting of B, and at the start of the restoration status, a B+ signal is sent to the control layer, and at the end, a B- signal is sent to the control layer.

[0021] Step 3: Start monitoring and repairing the power grid, which specifically includes the following steps:

[0022] Step 1: Conduct periodic detection on the power grid, and determine whether the power grid is in an emergency state. If so, proceed to Step 2; if not, proceed to Step 3.

[0023] Step 2: Schedule the emergency handling layer to control the power grid to automatically access the control layer, and send the emergency status information S to the control layer, then enter Step 4.

[0024] Step 3: Determine whether the power grid is in an abnormal state. If so, enter Step 5; if not, enter Step 7.

[0025] Step 4: Enter the restoration state in the emergency state, send a B+ signal to the control layer, enter the repair cycle X, and the control layer schedules the repair resources for one cycle and reserves the repair resources for two cycles X, then reach Step 6.

[0026] Step 5: Set the abnormal state level, judge the level. If the level is less than 2, send the A1 signal to the control layer and enter Step 9; if it is greater than or equal to 2, send the A2 signal to the control layer and enter Step 10.

[0027] Step 6: Determine whether the repair in one cycle is completed. If it is successfully completed, send signal B- to the control layer and proceed to Step 8;

[0028] Step 7: Determine whether the power grid is in a normal operating state. If not, a communication failure has occurred in the power grid, and the access layer controls the connection of the power grid to the control layer. If so, set the monitoring cycle and transfer to Step 1 to monitor the operating state of the power grid again;

[0029] Step 8: At this time, it changes from an emergency state to an abnormal state, and transfer to Step 3;

[0030] Step 9: Enter the recovery state under the A1-level abnormal state. At the beginning, send signal B+ to the control layer. The control layer schedules the repair resources for one cycle X. At the end, send signal B- to the control layer and transfer to Step 1;

[0031] Step 10: Enter the recovery state under the A2-level abnormal state. At the beginning, send signal B+ to the control layer. The control layer schedules the repair resources for one cycle X and reserves the repair resources for one cycle. At the end, send signal B- to the control layer and enter Step 11;

[0032] Step 11: Determine whether the power grid is in a normal state. If so, end the process. If not, transfer to Step 3.

[0033] It should be understood that the embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. An optimization method for the global coordination control architecture under the emergency state of a distribution network, characterized in that It includes the following steps: S1: Establish a global coordinated control architecture for the power grid in an emergency state. The global coordinated control architecture includes: a monitoring layer, an access layer responsible for guiding the power grid to automatically access the control layer and transmitting signals to the control layer when a communication failure occurs in the power grid, an emergency handling layer, an emergency handling layer, and a control layer; S2: Set the operating states of the power grid, perform periodic monitoring on each operating state, and set the following operating states of the power grid according to the operating conditions of the power grid: an unconventional state, an emergency state, a repair state, and a normal operating state. After dividing the states, set priority signals for each state and send corresponding signals to the control layer in such states; S3: Conduct a priority assessment on each operating state of the power grid and formulate an optimization method for the global coordinated control architecture in each operating state according to the priority order.

2. The optimization method for the global coordination control architecture under the emergency state of a distribution network according to claim 1, characterized in that, The monitoring layer is responsible for monitoring the overall operating state of the power grid and performing periodic monitoring and zonal detection according to the operating state; the emergency handling layer transmits information to the control layer when an emergency occurs and guides the power grid to automatically access the control layer; the control layer receives the regulation instructions, analyzes the instructions, and controls the operation of the power grid.

3. The optimization method for the global coordination control architecture under the emergency state of the distribution network according to claim 2, wherein, Conduct a priority assessment on each of the above-mentioned operating states, and set the priorities as follows: level C is the normal operating state, level B is the recovery state, level A is the unconventional state, and level S is the emergency state. The priority gradually increases from C to S, and level S is set as the highest priority.

4. An optimization method for the global coordination control architecture in the emergency state of a distribution network, according to claim 3, characterized in that The control architecture scheduling and state transformation in the unconventional state include the following: Detect the current operating state of the power grid. The monitoring layer detects in sequence according to the priority. First, judge whether the power grid is in an emergency state. If not, then judge whether the power grid is in an unconventional state. If the power grid is in an unconventional state, set the unconventional state level. The state level increases successively from unconventional levels 0 - 3. Among them, when the level is greater than or equal to 2, it is a high-level unconventional state. Feed back the A2 level information to the control layer and perform a repair operation. After the repair, judge whether it has entered the normal state. If it is in the normal state, end the loop; otherwise, continue to judge the repair. If the state level is less than 2, send an A1 signal to the control layer and transfer to the first repair state. After the repair is completed, return to the initial detection state and re-detect the operating state of the power grid.

5. An optimization method for the global coordination control architecture in an emergency state of a distribution network, as claimed in claim 3, wherein The control scheduling and state transformation in the emergency state include the following: Judge in sequence according to the priority whether the power grid is in an emergency state. If it is in an emergency state, feed back the S-level state information to the control layer. The emergency handling layer guides it into the control layer and enters the repair state of the emergency. Allocate resources for repair. If a resource conflict or other reasons cause the repair to be interrupted during the repair process, jump back to the previous step and start the repair again. After a round of repair is completed, enter the unconventional state. At this time, detect the unconventional level and feed back the level information to the control layer, and perform a secondary repair. After the secondary repair, conduct a normal state inspection. If it becomes the normal state, end the loop; if it is not in the normal state, continue the loop repair detection process.

6. The optimization method for the global coordination control architecture under the emergency state of a distribution network according to claim 4, wherein The scheduling content in the repair state includes: setting a repair cycle X. When the power grid transfers from the emergency state to the repair state, allocate the repair resources required for one cycle X for it, additionally reserve the repair resources required for two cycles X, and then return to the detection state. After the repair is completed, release all allocated resources. If the power grid transfers from the abnormal state to the repair state, judge the state level. If the level is A1, allocate the repair resources required for one cycle X for it. If the level is A2, allocate the resources required for one cycle X for it, and then additionally reserve the repair resources required for one cycle X. At the beginning of the repair cycle, send a B+ signal to the control layer, and at the end, send a B- signal to the control layer and wait for the inspection of the repair result.

7. An optimization method for the global coordination control architecture under the emergency state of a distribution network, as described in claim 3, characterized in that The judgment and scheduling in the normal operation state include the following content: conduct sequential detection according to the priority to judge whether the power grid is in the emergency state. If it is not in the emergency state, judge whether the power grid is in the abnormal state. If not, judge whether the power grid is in the normal operation state. If it is in the normal operation state, send a C signal to the control layer, set a detection cycle T, and continuously detect the power grid state with T as the cycle until an emergency state or an abnormal state appears.

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