CN110350595B - Load fast decision control method for maintaining stable section of subarea in accident state - Google Patents
Load fast decision control method for maintaining stable section of subarea in accident state Download PDFInfo
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- CN110350595B CN110350595B CN201910532901.8A CN201910532901A CN110350595B CN 110350595 B CN110350595 B CN 110350595B CN 201910532901 A CN201910532901 A CN 201910532901A CN 110350595 B CN110350595 B CN 110350595B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
Abstract
The invention discloses a load fast decision control method for maintaining stable section of a subarea in an accident state, which comprises the following steps: the local dispatching merges power transmission and distribution lines related to the cut-off load to a transformer station of which the section belongs according to the local regional power grid structure and the load condition, so as to determine a load batch control station sequence, and the local dispatching each station current cut-off capacity is counted by the local dispatching and stored in a cut-off capacity counting table; the method comprises the steps that under an accident state, a provincial dispatching and online safety and stability analysis system is interacted to generate an optimal load control target, the online safety and stability analysis system obtains a multi-region load control strategy online through the optimal load control target and a cut-off capacity statistical table, so that actual capacity to be cut off of each station is generated, a message body is formed, and the message body is sent to the provincial dispatching; the provincial dispatching transmits the station with the required capacity to be cut and the information of the size of the capacity to the local dispatching according to the message body, and the local dispatching performs automatic load batch control on the station with the required capacity to be cut according to the information. The invention ensures the safe and stable operation of the power grid.
Description
Technical Field
The invention belongs to the technical field of power system control, and particularly relates to a load rapid decision control method for maintaining stable partition sections in an accident state of an online safety and stability analysis system and a load batch control system.
Background
At present, the Henan power grid has been developed into an ultra-high voltage alternating current-direct current series-parallel large power grid, the power grid operation characteristics have been deeply changed, the contradiction between strong and weak intersections is outstanding, the power grid frequency stability problem is worsened, the power grid power flow control difficulty is increased, the risk of alternating current-direct current fault chain reaction is increased, the emergency treatment level of dispatching is improved for coping with emergency situations such as power grid accidents, anomalies and the like, the safe and stable operation of the power grid is ensured, and the Henan power grid is uniformly deployed with a load batch control system based on a smart power grid dispatching control system. When an accident is abnormal, each local regulator starts a load batch control function according to a load batch control target value or a regional power grid running condition which is issued by the province regulator, a load batch control scheme is generated according to an accident and overload pull-out threshold sequence table, and the operation is executed after the error is confirmed. After the execution of the load batch control operation instruction is finished, if the load control quantity does not reach the control target value, the load batch control scheme is regenerated by ground call according to the difference and the operation is executed again, so that the full-load completion of the load control requirement is ensured. After the load batch control is completed, the load batch control execution list is adjusted and stored, and load recovery preparation is performed. Henan province regulation is responsible for guiding and supervising each local regulation, making a capacity-based and round-refined accident and overload switching-out limit electric sequence table according to the province regulation accident switching-out limit electric sequence table, and distributing and issuing the load batch control target value of each region under the abnormal accident condition. However, the current load control target for accidents is determined offline according to operation experience, and problems of over-cut or under-cut possibly exist during online execution, so that a load control refined calculation technology based on online safety and stability analysis needs to be researched.
Meanwhile, the provincial and local power grid has the function of controlling the command interaction of the provincial and local system in batches, the provincial and local system in batches can send control commands to the local system in batches, but the local system in batches can not controllably adjust specific stations in the system in batches.
Disclosure of Invention
The invention provides a load quick decision control method for maintaining stable section of a partition under an accident state, aiming at the problems that the control target of the current load-saving and load-regulating batch control system is determined empirically, the load control target cannot be accurately formulated when a serious accident occurs, and the quick control cannot be performed by taking a specific plant station with the section as a unit.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a load fast decision control method for maintaining stable section of a subarea in an accident state comprises the following steps:
step 1: the local load adjustment batch control system merges power transmission and distribution lines related to the cuttable load to a transformer station to which a section belongs according to the regional power grid structure and the load condition, so as to determine a load batch control station sequence, and the power saving load batch control system counts the current cuttable capacity of each station corresponding to each local load adjustment batch control system and stores the cuttable capacity of each station into a cuttable capacity statistics table;
step 2: the method comprises the steps that a load-saving and regulating batch control system and an online safety and stability analysis system are interacted to generate an optimal load control target for recovering stable operation of a section under an accident state, the online safety and stability analysis system obtains a multi-region load control strategy online through the optimal load control target and the switchable capacity statistical table, actual required cut-off capacity of each plant station corresponding to the load-saving and regulating batch control system is generated through the strategy, a message body is formed, and the message body is sent to the load-saving and regulating batch control system;
step 3: and after receiving the message body, the load-saving batch control system sends the information of the stations with the required capacity to be removed and the size of the capacity to the ground-control batch control system, and the ground-control batch control system performs automatic load batch control on the stations with the required capacity to be removed according to the information.
Further, the load batch control station sequence is characterized by comprising a plurality of 220kV stations, and the load batch control station sequence can automatically merge the load-cutting power transmission and distribution lines into the 220kV stations according to a power grid topological graph.
Further, the sensible capacity statistical table further includes a station ID, a station area ID, and a station controllable state.
Further, the multi-zone load control strategy comprises:
a. the load control is utilized to eliminate the heavy load and out-of-limit of the section equipment in the accident state, so that the cut load quantity is minimum when the optimal load control target is reached;
b. calculating the influence factors of the load control of each partition on the safety and stability of the power grid by adopting a sensitivity analysis method, identifying the load control priority of each partition under a key fault, calculating the load control quantity and the load control proportion of each partition according to the priority sequence based on the optimal load control target and the switchable capacity statistical table so as to ensure that the total load control quantity of the power grid is minimum, and adopting an equal proportion load control principle to disperse accident risks for the partitions with the same priority;
c. and for the subareas with overlarge load reduction proportion, comprehensively considering the sensitivity analysis result, the voltage safety and stability index and the load loss proportion, taking uniform load reduction as a principle, and distributing the load reduction amount of the subareas with safety risks to other subareas with close control sensitivity and larger safety risk margin so as to reduce or avoid the electric safety risks. Further, the message body includes a station ID of the capacity to be removed, an area ID of the station, and a capacity to be removed corresponding to each station.
Further, the ground load adjustment batch control system and the power saving load adjustment batch control system are provided with automatic execution mechanisms after confirmation.
Compared with the prior art, the invention has the beneficial effects that:
the invention matches and merges the power transmission section, the transformer substation and the power transmission and distribution line related to the cut-off load related to the accident stable control in a power grid topology calculation mode, generates the cut-off capacity of each plant station of the section and stores the cut-off capacity into a cut-off capacity statistical table, and can rapidly calculate the cut-off capacity of each transformer substation related to the power transmission section; the load batch control system is interacted with the online safety and stability analysis system rapidly, a multi-region load control strategy is obtained online, and the minimum load control target and the optimal distribution strategy are realized according to the sensitivity calculation result; the actual required cut-off capacity of each station corresponding to the ground load batch control system is further generated, a message body is formed and sent to the power saving load batch control system, the power saving load batch control system sends the station with the required cut-off capacity and the information of the size of the required cut-off capacity to the ground load batch control system, and the ground load batch control system performs automatic load batch control on the station with the required cut-off capacity according to the information, so that automatic closed-loop control of the load is realized. The invention comprehensively realizes the quick interaction and closed-loop control of an online safety and stability analysis system, a load-saving batch control system and a ground-adjusting load batch control system, solves the problems of over-cut and under-cut caused by empirical determination of the control targets of the load batch control system, can realize the quick and accurate control of the load in an accident state, improves the stable recovery capacity of the section, and ensures the safe and stable operation of the power grid.
Drawings
FIG. 1 is a basic flow chart of a method for controlling a load fast decision to maintain stable section of a partition in an accident situation according to an embodiment of the present invention;
fig. 2 is a load control strategy generation flowchart of a load fast decision control method for maintaining stable section of a partition in an accident situation according to an embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following description of specific embodiments in conjunction with the accompanying drawings:
as shown in fig. 1, a load fast decision control method for maintaining stable section of a partition in an accident state includes:
step S101: the local load batch control system (local load) merges power transmission and distribution lines related to the cuttable load to a transformer substation to which a section belongs according to the regional power grid structure and the load condition, so as to determine a load batch control station sequence, and the local load batch control system (local load) calculates the current (load) cuttable capacity of each station corresponding to each local load batch control system, and stores the cuttable capacity of each station into a (load) cuttable capacity statistical table; specifically, the load batch control station sequence consists of a plurality of 220kV stations, and the load batch control station sequence can automatically merge the load-cutting transmission and distribution lines into the 220kV stations according to a power grid topological graph; the sensible capacity statistical table also includes a station ID, a station area ID, and a station controllable state, as shown in table 1.
Table 1 table of the cutable Capacity statistics
| Domain name | Data type |
| Station ID | long |
| Capacity of plant station | float |
| Area ID to which a station belongs | long |
| Controllable state of plant station | int |
Step S102: the method comprises the steps that a load-saving and regulating batch control system and an online safety and stability analysis system are interacted to generate an optimal load control target for recovering stable operation of a section under an accident state, the online safety and stability analysis system obtains a multi-region load control strategy online through the optimal load control target and the switchable capacity statistical table, actual required cut-off capacity of each plant station corresponding to the load-saving and regulating batch control system is generated through the strategy, a message body is formed, and the message body is sent to the load-saving and regulating batch control system; specifically, the online safety and stability analysis system obtains a multi-region load control strategy on line based on an online safety analysis-based power grid key section distinguishing method, a power grid transmission section limit calculating method and the cut-off capacity statistical table; specifically, as shown in fig. 2, the multi-zone load control strategy includes:
a. the load control is utilized to eliminate the heavy load and out-of-limit of the section equipment in the accident state, so that the cut load quantity is minimum when the optimal load control target is reached;
b. calculating the influence factors of the load control of each partition on the safety and stability of the power grid by adopting a sensitivity analysis method, identifying the load control priority of each partition under a key fault, calculating the load control quantity and the load control proportion of each partition according to the priority sequence based on the optimal load control target and the switchable capacity statistical table so as to ensure that the total load control quantity of the power grid is minimum, and adopting an equal proportion load control principle to disperse accident risks for the partitions with the same priority;
c. and for the subareas with overlarge load reduction proportion, comprehensively considering the sensitivity analysis result, the voltage safety and stability index and the load loss proportion, taking uniform load reduction as a principle, and distributing the load reduction amount of the subareas with safety risks to other subareas with close control sensitivity and larger safety risk margin so as to reduce or avoid the electric safety risks.
The actual cutting capacity of each regional station for recovering the stable transmission section can be obtained through the load batch control target value of each regional station and the cutting capacity information of each regional station.
Step S103: after receiving the message body, the load-saving batch control system sends the information of the stations with the required capacity to be removed and the size of the capacity to the ground-control batch control system, and the ground-control batch control system automatically controls the loads of the stations with the required capacity to be removed according to the information; specifically, the message body includes a station ID of the capacity to be removed, an area ID of the station and a size of the capacity to be removed corresponding to each station, and the message body is as follows:
specifically, the ground load adjustment batch control system and the power saving load adjustment batch control system are provided with automatic execution mechanisms after confirmation. After receiving the message body sent in the step S102, the load-saving batch control system performs security check on the content of the message body, displays the total load quantity to be cut according to the area, and can display the capacity to be cut of each 220kV plant station in each area for the confirmation of a regulator, after the confirmation of the regulator, the load-saving batch control system automatically sends a message to the load-saving batch control system according to the area, and the content of the sent message comprises all 220kV plant stations in the area to which the load-saving batch control system belongs and the corresponding cut capacity of each 220kV plant station, and after the load-saving batch control system receives the confirmation information of the load-saving batch control system, the load batch control system can be synchronously displayed and quickly and automatically performed.
The invention matches and merges the power transmission section, the transformer substation and the power transmission and distribution line related to the cut-off load related to the accident stable control in a power grid topology calculation mode, generates the cut-off capacity of each plant station of the section and stores the cut-off capacity into a cut-off capacity statistical table, and can rapidly calculate the cut-off capacity of each transformer substation related to the power transmission section; the load batch control system is interacted with the online safety and stability analysis system rapidly, a multi-region load control strategy is obtained online, and the minimum load control target and the optimal distribution strategy are realized according to the sensitivity calculation result; the actual required cut-off capacity of each station corresponding to the ground load batch control system is further generated, a message body is formed and sent to the power saving load batch control system, the power saving load batch control system sends the station with the required cut-off capacity and the information of the size of the required cut-off capacity to the ground load batch control system, and the ground load batch control system performs automatic load batch control on the station with the required cut-off capacity according to the information, so that automatic closed-loop control of the load is realized. The invention comprehensively realizes the quick interaction and closed-loop control of an online safety and stability analysis system, a load-saving batch control system and a ground-adjusting load batch control system, solves the problems of over-cut and under-cut caused by empirical determination of the control targets of the load batch control system, can realize the quick and accurate control of the load in an accident state, improves the stable recovery capacity of the section, and ensures the safe and stable operation of the power grid.
The foregoing is merely illustrative of the preferred embodiments of this invention, and it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of this invention, and it is intended to cover such modifications and changes as fall within the true scope of the invention.
Claims (1)
1. The load fast decision control method for maintaining the stability of the section of the subarea in the accident state is characterized by comprising the following steps:
step 1: the local load adjustment batch control system automatically merges power transmission and distribution lines related to the cuttable load to a transformer station to which a section belongs according to the regional power grid structure and the load condition, so as to determine a load batch control station sequence, the power saving load batch control system counts the current cuttable capacity of each station corresponding to each local load adjustment batch control system, and stores the cuttable capacity of each station into a cuttable capacity statistics table; the cuttable capacity statistical table also comprises a station ID, a station area ID and a station controllable state; the load batch control station sequence consists of a plurality of 220kV stations, and the load batch control station sequence can automatically merge the load-cutting power transmission and distribution lines into the 220kV stations according to a power grid topological graph;
step 2: the method comprises the steps that a load-saving and regulating batch control system and an online safety and stability analysis system are interacted to generate an optimal load control target for recovering stable operation of a section under an accident state, the online safety and stability analysis system obtains a multi-region load control strategy online through the optimal load control target and the switchable capacity statistical table, actual required cut-off capacity of each plant station corresponding to the load-saving and regulating batch control system is generated through the strategy, a message body is formed, and the message body is sent to the load-saving and regulating batch control system; the message body comprises a station ID of the capacity to be removed, an area ID of the station, and the corresponding capacity to be removed of each station; the multi-zone load control strategy comprises:
a. the load control is utilized to eliminate the heavy load and out-of-limit of the section equipment in the accident state, so that the cut load quantity is minimum when the optimal load control target is reached;
b. calculating the influence factors of the load control of each partition on the safety and stability of the power grid by adopting a sensitivity analysis method, identifying the load control priority of each partition under a key fault, calculating the load control quantity and the load control proportion of each partition according to the priority sequence based on the optimal load control target and the switchable capacity statistical table so as to ensure that the total load control quantity of the power grid is minimum, and adopting an equal proportion load control principle to disperse accident risks for the partitions with the same priority;
c. for the subareas with overlarge load reduction proportion, comprehensively considering sensitivity analysis results, voltage safety and stability indexes and load loss proportion, taking uniform load reduction as a principle, and distributing the load reduction amount of the subareas with safety risks to other subareas with close control sensitivity and larger safety risk margin so as to reduce or avoid the electric safety risks;
step 3: after receiving the message body, the load-saving batch control system sends the information of the stations with the required capacity to be removed and the size of the capacity to the ground-control batch control system, and the ground-control batch control system automatically controls the loads of the stations with the required capacity to be removed according to the information; the ground load regulation batch control system and the power saving load regulation batch control system are provided with automatic execution mechanisms after confirmation.
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