CN111835015B - Power equipment coordination control system - Google Patents
Power equipment coordination control system Download PDFInfo
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- CN111835015B CN111835015B CN202010822093.1A CN202010822093A CN111835015B CN 111835015 B CN111835015 B CN 111835015B CN 202010822093 A CN202010822093 A CN 202010822093A CN 111835015 B CN111835015 B CN 111835015B
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a power equipment coordination control system, which comprises: the device comprises a strategy control module, a communication management module and a voltage-stabilizing bypass module. According to the power equipment control system, the communication mode and the state conversion process among different equipment are configured by utilizing the optimized control strategy of power equipment management, voltage stabilization and substitution are carried out on fault equipment needing to be removed, and meanwhile, the security protection function of state monitoring can be realized.
Description
Technical Field
The invention relates to the field of power grid security, in particular to a power equipment coordination control system.
Background
The power grid control technology is widely applied to the power equipment, so that the whole power equipment control process realizes automatic monitoring, control and management.
For the security monitoring of multiple devices, how to coordinate the communication process and control the communication state of the devices is a management problem in the power industry.
Disclosure of Invention
In order to solve the defects and shortcomings in the prior art, the invention provides a power equipment coordination control system, which comprises: the system comprises a strategy control module, a communication management module and a voltage-stabilizing bypass module; wherein:
the policy control module is configured to:
and calculating a control target of each running device by adopting an optimization control algorithm, receiving a control command by the running device, and maintaining the terminal voltage of the reactive voltage device by adjusting the voltage controller. Under an emergency condition, sensing that the voltage of a nearby node is abnormal through operation equipment, and autonomously adjusting the voltage setting value of the control equipment in an autonomous mode; if the local autonomous control cannot completely recover the abnormal voltage due to the limit of the capacity of the control device, sending an auxiliary voltage regulation request message to the control device, carrying out control command by the control device, and sequentially selecting other control devices from high to low according to the voltage control capacity of other operating devices to assist in completing the voltage regulation task. When the operating equipment detects that the local or adjacent node voltage is abnormal, the operating equipment works in an autonomous mode, adjusts the setting value of local or adjacent node voltage control, and changes the reactive power output of the control equipment.
And in the emergency situation of voltage abnormality, an autonomous mode is adopted for control, and the voltage of the transmitting end of the power transmission system is kept at a certain value by utilizing the reactive power margin of the generator.
The communication management module is configured to:
and the multi-device communication control adopts a point-to-point request-response mode to realize the communication control of the multi-device. In this manner, both the sender and recipient of the message are known. When any running device needs other devices to assist in completing the task, a voltage regulation assisting request is sent to the power grid control device. And after receiving the request, the control equipment selects the operating equipment adjacent to any operating equipment according to the operating condition of the power grid to assist voltage regulation, and sends an instruction to the requested operating equipment and the assisting equipment. And the assisting equipment receives the instruction and judges whether the instruction conflicts with the self power distribution control, if not, the assisting equipment starts to execute the instruction, controls the operation equipment of the request to complete the voltage regulation task and returns task completion information to the control equipment. And if the assisted operating equipment harms the self power distribution control after receiving the instruction, feeding back rejection information to the power grid control equipment, and rearranging the assistance task by the control equipment.
The control equipment in the communication control process sends a request and monitors two working states, and can provide alarm information for managers; the running equipment has three working states of monitoring, requesting and executing tasks. The specific communication control working state is as follows:
1) under the normal operation state, each device is in a monitoring state, the primary operation device monitors the node voltage and the line voltage in the coverage range, and the power grid control device detects the node voltage which is not covered by the operation device in the system. In an emergency, a state transition of the device is triggered by a node voltage violation. The monitoring state is an initial state of the system and is also a termination state for completing the voltage emergency control.
2) When the operation equipment detects that the node voltage in the coverage area is out of limit and judges that the out-of-limit voltage cannot be recovered to be normal through self regulation, the operation equipment sends a voltage regulation assisting request to the power grid control equipment, reports the specific condition of the out-of-limit voltage and enters a request state.
3) And the control equipment selects the running equipment in the power grid as the assisting equipment according to the optimization algorithm, sends a secondary assisting voltage control request to the assisting equipment and enters a request state. The operation equipment receiving the voltage regulation assisting request determines that the action of assisting the voltage regulation does not harm self power distribution control, sends confirmation information to the power grid control equipment, starts local secondary voltage control, provides corresponding voltage and reactive support, and enters an execution state.
4) And the operating equipment providing the secondary voltage support returns to the monitoring state from the execution state after completing the voltage regulation task.
5) And the running equipment requesting voltage control support monitors the local voltage state in real time, and if the out-of-limit voltage is recovered to be normal, a recovery confirmation message is sent to the control equipment.
6) And the power grid control equipment receives confirmation messages of finishing tasks of each running equipment requesting voltage support and providing the voltage support, and returns to the monitoring state.
7) If the power grid control equipment in the request sending state does not receive task execution information of the operating equipment providing voltage support within given time, the fact that the voltage out-of-limit in emergency situations cannot be eliminated through secondary voltage control is indicated, at the moment, the control equipment sends a message of failure in assisting voltage regulation to the operating equipment requesting for assisting voltage regulation, sends alarm information to managers, and returns to the monitoring state.
8) If the operation equipment sending the assistant pressure regulating request does not receive the confirmed pressure regulating information of the control equipment within the given time or receives the information of the assistant pressure regulating failure, the whole process information of the assistant pressure regulating request is recorded, reserved in the database and returned to the monitoring state.
The voltage-stabilizing bypass module is used for:
obtaining the load of any bus belt of the operating equipment according to the power grid geographical wiring diagram, the primary wiring diagram, the power grid parameters and the load of each operating equipment; the load of the bus belt only comprises the load directly carried by the bus belt, the active load obtained by the bus with the voltage level smaller than that of the bus and the active power flowing among the buses with the same voltage level.
Converting a wiring diagram of the whole network into a power system directed weighted graph, wherein nodes in the graph represent buses or bus sections of the electrical equipment; the side represents the electrical equipment connected with the bus or the bus section, and the electrical equipment comprises a bus tie breaker transmission line, operation equipment, control equipment and a generator; the weight of the side is the tide data recorded immediately before the fault occurs, the sign of the weight of the side is set as positive, negative and the direction of the side is the flow direction of the tide.
Under the condition that the load power factor of any bus is kept constant, the active power and the reactive power are gradually increased in proportion until the system is in a critical state; when calculation is carried out, the sum component of the load is increased in each iteration until the load flow calculation result is not converged, and the result of the last convergence is taken as a critical point; when the active load and the reactive load of the simulation node are increased, the bus node voltage of each simulation can be calculated, and therefore a plurality of coordinate points required by drawing a margin curve can be obtained.
Drawing a margin curve of the node according to the obtained coordinate point; and according to the margin curve, acquiring the load size Fo of the node in the initial state and the load size Fr of the node in the critical collapse state, and calculating an active margin Fp according to the load size Fo of the node in the initial state and the load size Fr of the node in the critical collapse state, wherein Fp = (Fr-Fo)/(Fo + 1).
Performing analog calculation on all nodes to obtain an active margin index of the whole network, selecting a bus of operating equipment for analysis during the analog calculation, and performing analog growth on the sum of active and reactive loads of the whole network to generate a bus voltage change condition; and drawing a graph according to the bus voltage change conditions of the nodes, and calculating the active margin index of the whole network.
Determining the grouping of the generators corresponding to the operating equipment according to the active margin index of the whole network, if the active margin of the operating equipment is smaller than the active margin index of the whole network, classifying the nodes corresponding to the generators to which the operating equipment belongs into a step-out group, otherwise classifying the nodes corresponding to the generators to which the operating equipment belongs into a stable group, and classifying the step-out group and the stable group into sets A and B respectively.
Assigning branch weights to operating equipment and generators in a set on a directed weighted graph, wherein the node weights are the sum of the weights of all connected branches, and the branch weights can be positive values or negative values; starting from the set with the smaller number of nodes in the set A, B, each node starts to search the branch connected with the node, each branch adjacent to the node is added into the two generator sets A and B in sequence, and the weight of the set is calculated so as to minimize the weight of the newly formed set, wherein the initial weight of the set is the node weight sum of all the nodes in the set.
When any newly added branch leads the weight value of the set to start to increase, the weight value of the newly formed set is shown to be minimum, the search is ended at the moment, the branches which are connected with the two sets, namely the branches which are not added with the set, are counted, and all the running devices in the branches which are not added with the set are determined as the cut running device set.
Replacing the bypass 15min electric quantity of the operation equipment in the cut operation equipment set in a set time period on a replaced switch to finish the replacement and statistics of the electric quantity; and meanwhile, recording the bypass generation information and the final bypass electric quantity data, and providing bypass generation alarm and bypass generation confirmation.
Preferably, the control device manages all the operating devices in the power grid, comprehensively evaluates the voltage control behavior of each operating device, and keeps the reactive voltage of the power grid at a normal level, and the control device comprises a communication, reasoning and rule making unit, wherein the communication unit collects implementation state data of each operating device or receives a task assistance request of the operating device on one hand, and sends a reactive optimization calculation result to each operating device on the other hand, so that a basis is provided for local voltage control of the operating device, or selects the operating device to perform voltage regulation assistance in an emergency situation. The database stores real-time state data of each running device in the power grid and a calculation result of the reasoning unit.
The inference unit has two decision modes: in a parallel optimization calculation mode under normal conditions, according to real-time voltage, active power and reactive power information of each node stored in a database, a reference voltage setting value of control equipment monitored by each operating equipment of a power grid is given, and a result is stored in the database and reaches each operating equipment; in the task assistance mode under the emergency situation, according to help seeking information sent by operating equipment, the most suitable operating equipment is selected for local voltage control through evaluation of environmental information and voltage control capacity of adjacent operating equipment, voltage out-of-limit of nodes is eliminated, and a decision mode for determining the equipment is formulated regularly, wherein the decision mode comprises a voltage reactive power out-of-limit criterion, a control range of each operating equipment and a voltage reference value of control equipment monitored by the operating equipment.
According to the power equipment control system, the communication mode and the state conversion process among different equipment are configured by utilizing the optimized control strategy of power equipment management, voltage stabilization and substitution are carried out on fault equipment needing to be removed, and meanwhile, the security protection function of state monitoring can be realized.
Drawings
Fig. 1 is a structural diagram of a power equipment coordination control system according to the present invention.
Detailed Description
As shown in fig. 1, the power equipment coordination control system of the present invention includes: the system comprises a strategy control module, a communication management module and a voltage-stabilizing bypass module; wherein:
the policy control module is configured to:
when the system is in a normal condition, the control system aims to realize global optimal control and maintain the overall voltage level and good reactive power distribution of the system.
And calculating a control target of each running device by adopting an optimization control algorithm, receiving a control command by the running device, and maintaining the terminal voltage of the reactive voltage device by adjusting the voltage controller. Under an emergency condition, sensing that the voltage of a nearby node is abnormal through operation equipment, and autonomously adjusting the voltage setting value of the control equipment in an autonomous mode; if the local autonomous control cannot completely recover the abnormal voltage due to the limit of the capacity of the control device, sending an auxiliary voltage regulation request message to the control device, carrying out control command by the control device, and sequentially selecting other control devices from high to low according to the voltage control capacity of other operating devices to assist in completing the voltage regulation task. When the operating equipment detects that the local or adjacent node voltage is abnormal, the operating equipment works in an autonomous mode, adjusts the setting value of local or adjacent node voltage control, and changes the reactive power output of the control equipment.
And in the emergency situation of voltage abnormality, an autonomous mode is adopted for control, and the voltage of the transmitting end of the power transmission system is kept at a certain value by utilizing the reactive power margin of the generator.
The communication management module is configured to:
and the multi-device communication control adopts a point-to-point request-response mode to realize the communication control of the multi-device. In this manner, both the sender and recipient of the message are known. When any running device needs other devices to assist in completing the task, a voltage regulation assisting request is sent to the power grid control device. And after receiving the request, the control equipment selects the operating equipment adjacent to any operating equipment according to the operating condition of the power grid to assist voltage regulation, and sends an instruction to the requested operating equipment and the assisting equipment. And the assisting equipment receives the instruction and judges whether the instruction conflicts with the self power distribution control, if not, the assisting equipment starts to execute the instruction, controls the operation equipment of the request to complete the voltage regulation task and returns task completion information to the control equipment. And if the assisted operating equipment harms the self power distribution control after receiving the instruction, feeding back rejection information to the power grid control equipment, and rearranging the assistance task by the control equipment.
The control equipment in the communication control process sends a request and monitors two working states, and can provide alarm information for managers; the running equipment has three working states of monitoring, requesting and executing tasks. The specific communication control working state is as follows:
1) under the normal operation state, each device is in a monitoring state, the primary operation device monitors the node voltage and the line voltage in the coverage range, and the power grid control device detects the node voltage which is not covered by the operation device in the system. In an emergency, a state transition of the device is triggered by a node voltage violation. The monitoring state is an initial state of the system and is also a termination state for completing the voltage emergency control.
2) When the operation equipment detects that the node voltage in the coverage area is out of limit and judges that the out-of-limit voltage cannot be recovered to be normal through self regulation, the operation equipment sends a voltage regulation assisting request to the power grid control equipment, reports the specific condition of the out-of-limit voltage and enters a request state.
3) And the control equipment selects the running equipment in the power grid as the assisting equipment according to the optimization algorithm, sends a secondary assisting voltage control request to the assisting equipment and enters a request state. The operation equipment receiving the voltage regulation assisting request determines that the action of assisting the voltage regulation does not harm self power distribution control, sends confirmation information to the power grid control equipment, starts local secondary voltage control, provides corresponding voltage and reactive support, and enters an execution state.
4) And the operating equipment providing the secondary voltage support returns to the monitoring state from the execution state after completing the voltage regulation task.
5) And the running equipment requesting voltage control support monitors the local voltage state in real time, and if the out-of-limit voltage is recovered to be normal, a recovery confirmation message is sent to the control equipment.
6) And the power grid control equipment receives confirmation messages of finishing tasks of each running equipment requesting voltage support and providing the voltage support, and returns to the monitoring state.
7) If the power grid control equipment in the request sending state does not receive task execution information of the operating equipment providing voltage support within given time, the fact that the voltage out-of-limit in emergency situations cannot be eliminated through secondary voltage control is indicated, at the moment, the control equipment sends a message of failure in assisting voltage regulation to the operating equipment requesting for assisting voltage regulation, sends alarm information to managers, and returns to the monitoring state.
8) If the operation equipment sending the assistant pressure regulating request does not receive the confirmed pressure regulating information of the control equipment within the given time or receives the information of the assistant pressure regulating failure, the whole process information of the assistant pressure regulating request is recorded, reserved in the database and returned to the monitoring state.
In the control process, the most important step is how the power grid control equipment selects the most appropriate operating equipment to carry out secondary voltage control assistance, so that the control system can complete the voltage emergency control task in the shortest time and the most effective control means.
The voltage-stabilizing bypass module is used for:
obtaining the load of any bus belt of the operating equipment according to the power grid geographical wiring diagram, the primary wiring diagram, the power grid parameters and the load of each operating equipment; the load of the bus belt only comprises the load directly carried by the bus belt, the active load obtained by the bus with the voltage level smaller than that of the bus and the active power flowing among the buses with the same voltage level.
Converting a wiring diagram of the whole network into a power system directed weighted graph, wherein nodes in the graph represent buses or bus sections of the electrical equipment; the side represents the electrical equipment connected with the bus or the bus section, and the electrical equipment comprises a bus tie breaker transmission line, operation equipment, control equipment and a generator; the weight of the side is the tide data recorded immediately before the fault occurs, the sign of the weight of the side is set as positive, negative and the direction of the side is the flow direction of the tide.
Under the condition that the load power factor of any bus is kept constant, the active power and the reactive power are gradually increased in proportion until the system is in a critical state; when calculation is carried out, the sum component of the load is increased in each iteration until the load flow calculation result is not converged, and the result of the last convergence is taken as a critical point; when the active load and the reactive load of the simulation node are increased, the bus node voltage of each simulation can be calculated, and therefore a plurality of coordinate points required by drawing a margin curve can be obtained.
Drawing a margin curve of the node according to the obtained coordinate point; and according to the margin curve, acquiring the load size Fo of the node in the initial state and the load size Fr of the node in the critical collapse state, and calculating an active margin Fp according to the load size Fo of the node in the initial state and the load size Fr of the node in the critical collapse state, wherein Fp = (Fr-Fo)/(Fo + 1).
Performing analog calculation on all nodes to obtain an active margin index of the whole network, selecting a bus of operating equipment for analysis during the analog calculation, and performing analog growth on the sum of active and reactive loads of the whole network to generate a bus voltage change condition; and drawing a graph according to the bus voltage change conditions of the nodes, and calculating the active margin index of the whole network.
Determining the grouping of the generators corresponding to the operating equipment according to the active margin index of the whole network, if the active margin of the operating equipment is smaller than the active margin index of the whole network, classifying the nodes corresponding to the generators to which the operating equipment belongs into a step-out group, otherwise classifying the nodes corresponding to the generators to which the operating equipment belongs into a stable group, and classifying the step-out group and the stable group into sets A and B respectively.
Assigning branch weights to operating equipment and generators in a set on a directed weighted graph, wherein the node weights are the sum of the weights of all connected branches, and the branch weights can be positive values or negative values; starting from the set with the smaller number of nodes in the set A, B, each node starts to search the branch connected with the node, each branch adjacent to the node is added into the two generator sets A and B in sequence, and the weight of the set is calculated so as to minimize the weight of the newly formed set, wherein the initial weight of the set is the node weight sum of all the nodes in the set.
When any newly added branch leads the weight value of the set to start to increase, the weight value of the newly formed set is shown to be minimum, the search is ended at the moment, the branches which are connected with the two sets, namely the branches which are not added with the set, are counted, and all the running devices in the branches which are not added with the set are determined as the cut running device set.
Replacing the bypass 15min electric quantity of the operation equipment in the cut operation equipment set in a set time period on a replaced switch to finish the replacement and statistics of the electric quantity; and meanwhile, recording the bypass generation information and the final bypass electric quantity data, and providing bypass generation alarm and bypass generation confirmation.
Preferably, the control device manages all the operating devices in the power grid, comprehensively evaluates the voltage control behavior of each operating device, and keeps the reactive voltage of the power grid at a normal level, and the control device comprises a communication, reasoning and rule making unit, wherein the communication unit collects implementation state data of each operating device or receives a task assistance request of the operating device on one hand, and sends a reactive optimization calculation result to each operating device on the other hand, so that a basis is provided for local voltage control of the operating device, or selects the operating device to perform voltage regulation assistance in an emergency situation. The database stores real-time state data of each running device in the power grid and a calculation result of the reasoning unit.
The inference unit has two decision modes: in a parallel optimization calculation mode under normal conditions, according to real-time voltage, active power and reactive power information of each node stored in a database, a reference voltage setting value of control equipment monitored by each operating equipment of a power grid is given, and a result is stored in the database and reaches each operating equipment; in the task assistance mode under the emergency situation, according to help seeking information sent by operating equipment, the most suitable operating equipment is selected for local voltage control through evaluation of environmental information and voltage control capacity of adjacent operating equipment, voltage out-of-limit of nodes is eliminated, and a decision mode for determining the equipment is formulated regularly, wherein the decision mode comprises a voltage reactive power out-of-limit criterion, a control range of each operating equipment and a voltage reference value of control equipment monitored by the operating equipment.
After the bypass generation information and the final bypass electric quantity data are recorded, issuing a bypass generation alarm according to the bypass generation information and the final bypass electric quantity data and forming a related statistical report, and simultaneously displaying a confirmed bypass generation result, manually added bypass generation items and a bypass electric quantity statistical calculation result.
The strategy control module, the communication management module and the voltage stabilization side-substitution module realize module units through corresponding processes and threads, the modules are connected with each other through logic or electricity, and the specific units of the modules can be realized by program codes stored in a physical processor execution memory.
According to the power equipment control system, the communication mode and the state conversion process among different equipment are configured by utilizing the optimized control strategy of power equipment management, voltage stabilization and substitution are carried out on fault equipment needing to be removed, and meanwhile, the security protection function of state monitoring can be realized.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (2)
1. An electrical device coordination control system, comprising: the system comprises a strategy control module, a communication management module and a voltage-stabilizing bypass module; wherein the content of the first and second substances,
the policy control module is configured to:
calculating a control target of each running device by adopting an optimization control algorithm, receiving a control command by the running device, and maintaining the terminal voltage of the reactive voltage device by adjusting a voltage controller; under an emergency condition, sensing that the voltage of a nearby node is abnormal through operation equipment, and autonomously adjusting the voltage setting value of the control equipment in an autonomous mode; if the local autonomous control cannot completely recover the abnormal voltage due to the limit of the capacity of the control equipment, sending a voltage regulation assisting request message to the control equipment, carrying out control command by the control equipment, and sequentially selecting other control equipment from high to low according to the voltage control capacity of other operating equipment to assist in completing a voltage regulation task; when the operating equipment detects that the local or adjacent node voltage is abnormal, the operating equipment works in an autonomous mode, adjusts the setting value of local or adjacent node voltage control, and changes the reactive power output of the control equipment;
in the emergency situation of voltage abnormality, an autonomous mode is adopted for control, and the voltage of a transmitting end of a power transmission system is kept to be a certain value by utilizing the reactive power margin of a generator;
the communication management module is configured to:
multi-device communication control, which adopts a point-to-point request-response mode to realize the communication control of the multi-device; in this manner, both the sender and recipient of the message are known; when any running device needs other devices to assist in completing a task, a voltage regulation assistance request is sent to the power grid control device; after receiving the request, the control equipment selects running equipment adjacent to any running equipment according to the running condition of the power grid to assist voltage regulation, and sends an instruction to the requested running equipment and the requested assisting equipment; the assisting equipment receives the instruction and judges whether the instruction conflicts with self power distribution control, if not, the assisting equipment starts to execute the instruction, controls the requested operating equipment to finish a voltage regulation task and returns task completion information to the control equipment; if the assisted operating equipment harms self power distribution control after receiving the instruction, feeding back rejection information to the power grid control equipment, and rearranging an assisting task by the control equipment;
the control equipment in the communication control process sends a request and monitors two working states, and can provide alarm information for managers; the running equipment has three working states of monitoring, requesting and executing tasks; the specific communication control working state is as follows:
1) under a normal operation state, each device is in a monitoring state, the primary operation device monitors node voltage and line voltage in a coverage range, and the power grid control device detects the node voltage which is not covered by the operation device in the system; in an emergency, the state transition of the device is triggered by node voltage out-of-limit; the monitoring state is an initial state of the system and is also a termination state for finishing the voltage emergency control;
2) when the operation equipment detects that the node voltage in the coverage area is out of limit and judges that the out-of-limit voltage cannot be recovered to be normal through self regulation, the operation equipment sends a voltage regulation assisting request to the power grid control equipment, reports the specific condition of the out-of-limit voltage and enters a request state;
3) the control equipment selects running equipment in the power grid as assisting equipment according to an optimization algorithm, sends a secondary voltage assisting control request to the assisting equipment and enters a request state; the operation equipment receiving the voltage regulation assisting request determines that the action of assisting voltage regulation does not harm self power distribution control, sends confirmation information to the power grid control equipment, starts local secondary voltage control, provides corresponding voltage and reactive support, and enters an execution state;
4) after the voltage regulation task is finished, the operation equipment providing the secondary voltage support returns to the monitoring state from the execution state;
5) the method comprises the steps that operating equipment requesting voltage control support monitors the local voltage state in real time, and if the out-of-limit voltage is recovered to be normal, a recovery confirmation message is sent to control equipment;
6) the power grid control equipment receives confirmation messages of task completion of each running equipment requesting voltage support and providing the voltage support, and returns to the monitoring state;
7) if the power grid control equipment in the request sending state does not receive task execution information of operating equipment providing voltage support within given time, the fact that voltage out-of-limit in emergency cannot be eliminated through secondary voltage control is indicated, at the moment, the control equipment sends a message of failure of assisting voltage regulation to the operating equipment requesting for assisting voltage regulation, sends alarm information to managers, and returns to the monitoring state;
8) if the operating equipment sending the pressure regulating assisting request does not receive the confirmed pressure regulating information of the control equipment within the given time or receives the information of pressure regulating assisting failure, recording the whole process information of the pressure regulating assisting request, reserving the information in a database, and returning to the monitoring state;
the voltage-stabilizing bypass module is used for:
obtaining the load of any bus belt of the operating equipment according to the power grid geographical wiring diagram, the primary wiring diagram, the power grid parameters and the load of each operating equipment; the load of the bus belt only comprises the load directly carried by the bus belt, the active load obtained by the bus with the voltage level smaller than that of the bus and the active power flowing among the buses with the same voltage level;
converting a wiring diagram of the whole network into a power system directed weighted graph, wherein nodes in the graph represent buses or bus sections of the electrical equipment; the side represents the electrical equipment connected with the bus or the bus section, and the electrical equipment comprises a bus tie breaker transmission line, operation equipment, control equipment and a generator; the weight of the side is the tide data recorded immediately before the fault occurs, the sign of the weight of the side is set as positive, negative and the direction of the side is the flow direction of the tide;
under the condition that the load power factor of any bus is kept constant, the active power and the reactive power are gradually increased in proportion until the system is in a critical state; when calculation is carried out, the sum component of the load is increased in each iteration until the load flow calculation result is not converged, and the result of the last convergence is taken as a critical point; when the active load and the reactive load of the simulation node are increased, the bus node voltage of each simulation can be calculated, so that a plurality of coordinate points required by drawing a margin curve can be obtained;
drawing a margin curve of the node according to the obtained coordinate point; according to the margin curve, acquiring the load size Fo of the node in the initial state and the load size Fr of the node in the critical collapse state, and calculating an active margin Fp according to the load size Fo of the node in the initial state and the load size Fr of the node in the critical collapse state, wherein Fp = (Fr-Fo)/(Fo + 1);
performing analog calculation on all nodes to obtain an active margin index of the whole network, selecting a bus of operating equipment for analysis during the analog calculation, and performing analog growth on the sum of active and reactive loads of the whole network to generate a bus voltage change condition; drawing a graph according to the bus voltage variation conditions of a plurality of nodes, and calculating the active margin index of the whole network;
determining the grouping of the generators corresponding to the operating equipment according to the active margin index of the whole network, if the active margin of the operating equipment is smaller than the active margin index of the whole network, assigning the nodes corresponding to the generators to which the operating equipment belongs to a step-out group, otherwise assigning the nodes corresponding to the generators to which the operating equipment belongs to a stable group, and respectively classifying the step-out group and the stable group into sets A and B;
assigning branch weights to operating equipment and generators in a set on a directed weighted graph, wherein the node weights are the sum of the weights of all connected branches, and the branch weights can be positive values or negative values; starting from the set with the smaller number of nodes in the set A, B, starting from each node to search the branch connected with the node, sequentially adding each branch adjacent to the node into the two generator sets A and B, and calculating the weight of the set to minimize the weight of the newly formed set, wherein the initial weight of the set is the sum of the node weights of all the nodes in the set;
when any newly added branch leads the weight value of the set to start to increase, the weight value of the newly formed set is shown to be minimum, the search is ended at the moment, the branches which are connected with the two sets, namely the branches which are not added with the sets, are counted, and all running devices in the branches which are not added with the sets are determined to be used as a cutting running device set;
replacing the bypass 15min electric quantity of the operation equipment in the cut operation equipment set in a set time period on a replaced switch to finish the replacement and statistics of the electric quantity; and meanwhile, recording the bypass generation information and the final bypass electric quantity data, and providing bypass generation alarm and bypass generation confirmation.
2. The power equipment coordination control system according to claim 1, characterized in that:
the control equipment manages all operation equipment in the power grid, comprehensively evaluates the voltage control behavior of each operation equipment and keeps the reactive voltage of the power grid at a normal level, and comprises a communication, reasoning and rule making unit, wherein the communication unit collects implementation state data of each operation equipment or receives a task assistance request of the operation equipment on one hand and sends a reactive power optimization calculation result to each operation equipment on the other hand to provide a basis for local voltage control of the operation equipment or select the operation equipment to perform voltage regulation assistance in an emergency; the database stores real-time state data of each running device in the power grid and a calculation result of the reasoning unit;
the inference unit has two decision modes: in a parallel optimization calculation mode under normal conditions, according to real-time voltage, active power and reactive power information of each node stored in a database, a reference voltage setting value of control equipment monitored by each operating equipment of a power grid is given, and a result is stored in the database and reaches each operating equipment; in the task assistance mode under the emergency situation, according to help seeking information sent by operating equipment, the most suitable operating equipment is selected for local voltage control through evaluation of environmental information and voltage control capacity of adjacent operating equipment, voltage out-of-limit of nodes is eliminated, and a decision mode for determining the equipment is formulated regularly, wherein the decision mode comprises a voltage reactive power out-of-limit criterion, a control range of each operating equipment and a voltage reference value of control equipment monitored by the operating equipment.
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| CN202111173321.8A CN113852088A (en) | 2020-08-15 | 2020-08-15 | Power equipment coordination control system |
| CN202010822093.1A CN111835015B (en) | 2020-08-15 | 2020-08-15 | Power equipment coordination control system |
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| CN110932274A (en) * | 2019-12-18 | 2020-03-27 | 辽宁工业大学 | Power system measurement and load parameter analysis and identification method |
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