CN112733389A - Power grid fault handling plan generation method and device - Google Patents
Power grid fault handling plan generation method and device Download PDFInfo
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Abstract
A power grid fault handling plan generation method and a device are provided, the method comprises the following steps: identifying a power flow transfer condition and a power grid structure change condition after a preset fault; determining section information according to the stability control requirement and the power flow transfer condition, and simultaneously performing static safety analysis on the operation mode after the preset fault to obtain risk element information and risk section information; carrying out sensitivity analysis according to the risk element information and the risk section information to obtain a fault handling measure; and generating a new power grid fault handling plan according to the power flow transfer condition, the power grid structure change condition, the stability control requirement, the risk element information or section information and the fault handling measures and according to a preset format. Compared with the traditional offline manual plan compiling method and device, the method and device provided by the embodiment of the invention have the advantages that the accuracy and the adaptability of the plan are improved, the plan compiling efficiency is greatly improved, the labor cost is saved, and the batch fault plan can be compiled quickly.
Description
Technical Field
The invention relates to the technical field of intelligent analysis and control of power systems, in particular to a power grid fault handling plan generation method and device.
Background
With the rapid development of the large extra-high voltage alternating current-direct current hybrid power grid, the incidence relations among alternating current-direct current power grids, among power grids at a transmitting end and between power grids at different voltage levels become complex day by day, and new challenges are brought to the safe and stable operation of the power grids, and meanwhile new pressure is brought to operators on duty of dispatching mechanisms at all levels. Especially, serious faults such as high-power direct-current blocking, commutation failure and the like have great impact on the safety and stability of the power grid, and various complex fault rapid analysis and control decision-making technologies need to be researched.
The power grid fault handling plan is a movement scheme which is pre-established by a regulation and control mechanism aiming at possible faults of a power grid and for ensuring safe and stable operation of the power grid and rapidly and orderly developing emergency actions. At present, a fault plan is mainly compiled in an off-line manual mode, a control requirement is calculated according to the off-line mode, a control strategy and steps are generally given based on a specific target mode and a fault type, the control measures depend on the scheduling experience of a dispatcher to a large extent, deviations can occur in the accuracy, the adaptability to the current power grid operation mode and the performability of the control measures, and once the execution space and the implementation effect of the fault plan deviate from the target mode, the execution space and the implementation effect are unclear and the guiding significance is lost. And the workload of carrying out fault and load flow analysis, sensitivity calculation, control measure decision and the like on the power grid by manpower one by one is large, so that the power grid dispatcher is prone to be distracted and careless on duty, and is difficult to concentrate on power grid fault treatment.
Disclosure of Invention
In view of this, the invention provides a power grid fault handling plan generation method and device, and aims to solve the problems of poor accuracy and large workload depending on manual experience in the related art.
In a first aspect, an embodiment of the present invention provides a method for generating a grid fault handling plan, including: identifying a power flow transfer condition and a power grid structure change condition after a preset fault; determining section information according to the stability control requirement and the power flow transfer condition, and simultaneously performing static safety analysis on the operation mode after the preset fault to obtain risk element information and risk section information; carrying out sensitivity analysis according to the risk element information and the risk section information to obtain a fault handling measure; and generating a new power grid fault handling plan according to the power flow transfer condition, the power grid structure change condition, the stability control requirement, the risk element information, the risk section information and the fault handling measures and according to a preset format.
Further, the sensitivity analysis is performed according to the risk element information and the risk profile information to obtain a fault handling measure, and the method includes: and according to the risk element information and the risk section information, performing sensitivity analysis by adopting the following formula to obtain the sensitivity of each element which can participate in adjustment to the risk element:
wherein, in the step (A),
the active power of the transmission line is used,
for the phase angle of the voltage at the i-side node of the line,
for the phase angle of the voltage at the j-side node of the line,
active power for an adjustable generator or load; and screening the equipment associated with the risk elements and the risk sections according to the sensitivity and a preset rule, and generating a fault handling measure.
Further, the determining section information according to the stability control requirement and the power flow transfer condition, and performing static safety analysis on the operation mode after the preset fault to obtain risk element information and risk section information further includes: and forming a thermal stability quota calculation task on the section based on the stability control requirement to obtain a thermal stability quota result.
Further, after the identifying the power flow transfer condition and the power grid structure change condition after the preset fault, the method further includes: if the existing power grid fault handling plan comprises the preset fault, comparing the power flow transfer condition and the power grid structure change condition with corresponding parts in the existing power grid fault handling plan, and if the power flow transfer condition and the power grid structure change condition are not consistent, marking or correcting the existing power grid fault handling plan based on the power flow transfer condition and the power grid structure change condition; and if the existing power grid fault handling plan does not include the preset fault, generating a corresponding part in a new power grid fault handling plan.
Further, the determining section information according to the stability control requirement and the power flow transfer condition, and performing static safety analysis on the operation mode after the preset fault to obtain risk element information and risk section information further includes: if the existing power grid fault handling plan comprises the preset fault, comparing the risk element information or the section information with a corresponding part in the existing power grid fault handling plan, and if the risk element information or the section information is not consistent with the corresponding part in the existing power grid fault handling plan, marking or correcting the existing power grid fault handling plan based on the risk element information or the section information; and if the existing power grid fault handling plan does not include the preset fault, generating a corresponding part in a new power grid fault handling plan.
Further, after performing sensitivity analysis according to the risk element information and the risk profile information and obtaining a fault handling measure, the method further includes: if the existing power grid fault handling plan comprises the preset fault, comparing the fault handling measures with corresponding parts in the existing power grid fault handling plan, and if the fault handling measures are not consistent, marking or correcting the existing power grid fault handling plan based on the fault handling measures; if the fault handling measures in the existing power grid fault handling plan only comprise the adjustment direction, automatically generating the adjustment amount according to a preset rule; and if the existing power grid fault handling plan does not include the preset fault, generating a corresponding part in a new power grid fault handling plan.
Further, the grid fault handling protocol includes: the method comprises the steps of plan type and form, plan number, plan name, plan summary information, power grid initial operation mode, operation mode and influence after fault, stability control requirement and fault handling measures.
Further, the section information includes name, type, out-of-limit power, limit value and out-of-limit percentage of the section, and the risk element information includes name, type, out-of-limit power, limit value and out-of-limit percentage of the risk element.
In a second aspect, an embodiment of the present invention further provides a device for generating a grid fault handling plan, including: the identification unit is used for identifying the power flow transfer condition and the power grid structure change condition after the preset fault; the static safety analysis unit is used for determining section information according to the stability control requirement and the power flow transfer condition, and simultaneously performing static safety analysis on the operation mode after the preset fault to obtain risk element information and risk section information; the sensitivity analysis unit is used for carrying out sensitivity analysis according to the risk element information and the risk section information to obtain a fault handling measure; and the plan generating unit is used for generating a new power grid fault handling plan according to the power flow transfer condition, the power grid structure change condition, the stability control requirement, the risk element information, the risk section information and the fault handling measures and according to a preset format.
Further, the sensitivity analysis unit is further configured to: and according to the risk element information and the risk section information, performing sensitivity analysis by adopting the following formula to obtain the sensitivity of each element which can participate in adjustment to the risk element:
wherein, in the step (A),
the active power of the transmission line is used,
for the phase angle of the voltage at the i-side node of the line,
for the phase angle of the voltage at the j-side node of the line,
active power for an adjustable generator or load; and screening the equipment associated with the risk elements and the risk sections according to the sensitivity and a preset rule, and generating a fault handling measure.
Further, the apparatus further comprises: and the thermal stability quota calculating unit is used for forming a thermal stability quota calculating task on the basis of the section required by the stability control to obtain a thermal stability quota result.
Further, the apparatus further comprises: the first correction unit is used for comparing the power flow transfer condition and the power grid structure change condition with corresponding parts in the existing power grid fault handling plan if the existing power grid fault handling plan comprises the preset fault, and marking or correcting the existing power grid fault handling plan based on the power flow transfer condition and the power grid structure change condition if the power flow transfer condition and the power grid structure change condition are inconsistent; meanwhile, the plan generating unit is further configured to generate a corresponding portion in a new power grid fault handling plan if the existing power grid fault handling plan does not include the preset fault.
Further, the apparatus further comprises: a second correction unit, configured to compare the risk element information or the section information with a corresponding part in an existing power grid fault handling plan if the existing power grid fault handling plan includes the preset fault, and label or correct the existing power grid fault handling plan based on the risk element information or the section information if the risk element information or the section information is inconsistent with the corresponding part in the existing power grid fault handling plan; meanwhile, the plan generating unit is further configured to generate a corresponding portion in a new power grid fault handling plan if the existing power grid fault handling plan does not include the preset fault.
Further, the apparatus further comprises: a third correcting unit, configured to compare the fault handling measure with a corresponding portion in an existing power grid fault handling plan if the existing power grid fault handling plan includes the preset fault, and label or correct the existing power grid fault handling plan based on the fault handling measure if the fault handling measure is inconsistent with the corresponding portion in the existing power grid fault handling plan; the first supplement unit is used for automatically generating an adjustment amount according to a preset rule if the fault handling measures in the existing power grid fault handling plan only comprise an adjustment direction; meanwhile, the plan generating unit is further configured to generate a corresponding portion in a new power grid fault handling plan if the existing power grid fault handling plan does not include the preset fault.
Further, the grid fault handling protocol includes: the method comprises the steps of plan type and form, plan number, plan name, plan summary information, power grid initial operation mode, operation mode and influence after fault, stability control requirement and fault handling measures.
Further, the section information includes name, type, out-of-limit power, limit value and out-of-limit percentage of the section, and the risk element information includes name, type, out-of-limit power, limit value and out-of-limit percentage of the risk element.
In a third aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program is used, when executed by a processor, to implement the method provided in the embodiments of the present invention.
According to the method and the device for generating the power grid fault handling plan, static safety analysis and sensitivity analysis before and after a fault are carried out according to online data, and fault handling measures are obtained, so that a new power grid fault handling plan is automatically generated, compared with the traditional offline manual plan compiling method which mainly depends on experience, the accuracy and the adaptability of the plan are improved, the plan compiling efficiency is greatly improved, the labor cost is saved, and the batch fault plans can be compiled quickly; meanwhile, the power grid fault handling plan compilation of provincial and above regulation and control mechanisms can be standardized, the working intensity of regulation and control operators is reduced, the major fault cooperative handling capacity is improved, and the safe and stable operation of the power grid is better guaranteed.
According to the power grid fault handling plan generation method and device provided by some embodiments of the invention, the newly generated power grid fault handling plan is compared with the existing plan, the existing plan is automatically checked and supplemented, the correctness, the effectiveness and the reasonability of the plan can be evaluated, the relevant suggestions for perfecting the plan are given, the decision making calculation is assisted, and the system adjustment strategy is provided.
Drawings
Fig. 1 shows an exemplary flow diagram of a method of grid fault handling plan generation according to an embodiment of the invention;
FIG. 2 illustrates an electronic troubleshooting protocol report result generated in one embodiment of the present invention;
fig. 3 shows a schematic structural diagram of a power grid fault handling plan generation apparatus according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 shows an exemplary flowchart of a grid fault handling plan generation method according to an embodiment of the present invention.
As shown in fig. 1, the method includes:
step S101: and identifying the power flow transfer condition and the power grid structure change condition after the preset fault.
In the embodiment of the invention, the preset fault is a fault which is manually set or automatically set (DSA operation in a research state or fault name reading automatic setting is carried out by adopting a graphical operation or a table form) and power grid mode data. And identifying the power flow change and the power grid structure change before and after the fault, namely identifying the conditions of power flow transfer (a support list shows elements with larger power flow change) and power grid structure change (such as disconnection and partition).
Step S102: and determining section information according to the stability control requirement and the power flow transfer condition, and simultaneously performing static safety analysis on the operation mode after the preset fault to obtain risk element information and risk section information.
In the embodiment of the invention, the out-of-limit or heavy-load section is found out according to the comparison of the stability control requirement and the actual power flow after the fault, and the section information is obtained; and meanwhile, static safety analysis is carried out according to the operation mode after the fault, and elements and sections with static safety risks after the fault are judged.
Step S103: and carrying out sensitivity analysis according to the risk element information and the risk section information to obtain a fault handling measure.
In the embodiment of the invention, equipment capable of adjusting voltage and power is provided by adopting a sensitivity analysis method according to risk element information and risk section information, and a specific adjustment strategy, namely a fault handling measure, is obtained.
Step S104: and generating a new power grid fault handling plan according to the power flow transfer condition, the power grid structure change condition, the stability control requirement, the risk element information, the risk section information and the fault handling measures and according to a preset format.
In the embodiment of the invention, according to a preset template format, a power grid fault handling plan is automatically generated according to a power flow transfer condition, a power grid structure change condition, a stability control requirement, risk element information, risk section information and fault handling measures, and the modularization information of the power grid fault handling plan is exported to an electronic system.
Further, the grid fault handling protocol includes: the method comprises the steps of plan type and form, plan number, plan name, plan summary information, power grid initial operation mode, operation mode and influence after fault, stability control requirement and fault handling measures.
Specifically, a power grid fault handling plan (referred to as a "plan" for short) is an action plan which is pre-made by a regulation and control organization aiming at a fault possibly occurring in a power grid and for ensuring safe and stable operation of the power grid and rapidly and orderly developing emergency actions, and the contents of the action plan are as follows:
(1) plan type and form
The plan types include: a typical annual mode plan, a special operation mode plan, a natural disaster plan, a special important electricity protection plan, other plans and the like;
the plan form comprises: independent protocols and joint protocols.
(2) Plan number
The plan number is a unique appointed mark of the plan, is concise and easy to identify, and is compiled according to a format of 'regulation and control mechanism code-plan type code-compilation time-plan serial number-plan form code'.
(3) Name of the plan
The plan name should accurately reflect the basic information of the expected failure, and the plan name should be compiled according to the format of 'failure information-key equipment information-other', and should meet the following requirements: 1) and (3) fault information: mandatory items including failure equipment names and failure types; 2) key device information: selecting and filling items including the running state of key equipment, the action condition of a safety automatic device and the like; 3) and others: and (5) selecting a filling item and other information needing to be explained.
(4) Plan summary information
The plan summary information should satisfy the following requirements: 1) the plan summary information comprises a system to which the plan belongs, a plan grade, compiling time, a compiling personnel, a participating regulating and controlling mechanism, a compiling state and the like; 2) the plan summary information should include an initial operation mode overview of the power grid, an operation mode overview after a fault, a main operation risk of the power grid after the fault, and the like.
(5) Initial operation mode of power grid
The initial operation mode of the power grid mainly describes key operation characteristic information of the power grid before a fault occurs, and the key operation characteristic information of the power grid before the fault occurs comprises the following information: 1) power generation and load level; 2) area switching power; 3) a system standby level; 4) the running state of key equipment; 5) critical section or component currents; 6) a safe automatic device state; 7) other information.
(6) Post-fault operating mode and effects
The operation mode and influence after the fault mainly describe the operation state of the power grid after the expected fault occurs, the existing operation risk and influence, and the following information is contained: 1) specific equipment or areas affected by the fault, the action condition of a safety automatic device, the possible running state of the power grid, the level of the caused power grid safety accident and the like; 2) post-fault grid operating conditions include, but are not limited to: the method comprises the following steps of system frequency out-of-limit, power oscillation, section tidal current out-of-limit, main transformer/line tidal current out-of-limit, bus voltage out-of-limit, accident disconnection, full stop of a transformer substation and load loss.
(7) Stability control requirement
The regulation and control mechanism checks the constraint conditions which the given safe and stable operation of the power grid should meet. The requirements for stable control after a fault should be written in a plan and the following requirements are met: 1) defining safety constraint type, constrained equipment or area name and constraint limit value; 2) the security constraint types include: section/tie line current constraints, generator power constraints, voltage constraints, system standby constraints, safety automation and protection strategy constraints, and the like.
(8) Fault handling measures
And (4) taking control measures made for responding to the power grid fault and recovering the normal operation of the power grid as soon as possible. The fault handling measures should use the unified terminology specification and scheduling naming, and should make clear the contents of handling stages, handling operations, information notification, etc., and satisfy the following requirements: 1) the treatment phase includes a control phase, an adjustment phase, and a recovery phase. 2) The treatment operation should be written in sequence from high to low according to the emergency degree of the power grid, and the operation object and the operation type are determined, and the requirements of adjustment amount and treatment time limit are preferably given. 3) Information notification: and reporting the fault condition to a superior control mechanism and reporting the relevant units according to relevant regulations.
Further, the section information includes name, type, out-of-limit power, limit value and out-of-limit percentage of the section, and the risk element information includes name, type, out-of-limit power, limit value and out-of-limit percentage of the risk element.
According to the embodiment, the static safety analysis and the sensitivity analysis before and after the fault are carried out according to the online data, so that the fault handling measures are obtained, and a new power grid fault handling plan is automatically generated, compared with the traditional offline manual plan compiling method which mainly depends on experience, the accuracy and the adaptability of the plan are improved, the plan compiling efficiency is greatly improved, the labor cost is saved, and the batch fault plans can be compiled quickly; meanwhile, the power grid fault handling plan compilation of provincial and above regulation and control mechanisms can be standardized, the working intensity of regulation and control operators is reduced, the major fault cooperative handling capacity is improved, and the safe and stable operation of the power grid is better guaranteed.
Further, step S103 includes:
and according to the risk element information and the risk section information, performing sensitivity analysis by adopting the following formula to obtain the sensitivity of each element which can participate in adjustment to the risk element:
wherein the content of the first and second substances,
the active power of the transmission line is used,
for the phase angle of the voltage at the i-side node of the line,
for the phase angle of the voltage at the j-side node of the line,
active power for an adjustable generator or load;
and screening the equipment associated with the risk elements and the risk sections according to the sensitivity and a preset rule, and generating a fault handling measure.
In the embodiment of the present invention, specifically, in terms of the active out-of-limit sensitivity analysis of the device, considering that the influence of the power angle change on the active is much larger than the influence of the voltage change on the active, the simplified sensitivity equation of the power transmission line out-of-limit is as follows:
wherein the content of the first and second substances,
and
can be obtained from the inverse of the Jacobian matrix of the power flow equation,
and
can be calculated by the line power equation pair
And
and obtaining the derivative. Wherein the content of the first and second substances,
may be the active power of the generator; if the element involved in the adjustment is a load and the sensitivity of the load to the risk element needs to be determined, then
May be the active power of the load.
Through the simplified sensitivity equation of the out-of-limit of the power transmission line, the sensitivity of each element which can participate in adjustment to the out-of-limit element (out-of-limit line) and the out-of-limit section in the state is calculated and analyzed, all relevant equipment such as direct current, units or loads are found, sequencing is carried out according to the sensitivity, and the most relevant equipment is found and combined and acted repeatedly.
And calculating an output adjustment value according to the information and the out-of-limit power of the element, carrying the output adjustment value into the power grid data to recalculate the power flow, judging whether the output adjustment value is adjusted to be below a limit value or not, judging whether risk influence is generated on other elements of the power grid or not, if the output adjustment value does not meet the requirement, recalculating the output adjustment value according to the latest risk element condition, and repeatedly calculating until the output adjustment value meets the requirement.
In the embodiment, the fault handling measure calculation based on the on-line static power flow sensitivity analysis and the power flow safety constraint can provide an automatic, efficient and accurate analysis means for power grid fault handling and power flow control, greatly improve the plan compiling efficiency and enable batch fault plans to be compiled quickly.
Further, after step S102, the method further includes:
and forming a thermal stability quota calculation task on the section based on the stability control requirement to obtain a thermal stability quota result.
In the embodiment of the invention, a thermal stability quota calculation task is formed for a fracture which has a stability control requirement given in a plan or a fracture which needs to be focused, so that a thermal stability quota result is obtained. And moreover, the thermal stability quota calculation task can be issued to the DSA stability margin module and the thermal stability quota result can be transmitted back, and further, the part of the stability control requirement in the plan can be corrected or supplemented. The thermal stability quota calculation task and step S103 may be performed concurrently in parallel.
Further, after step S101, the method further includes:
if the existing power grid fault handling plan comprises the preset fault, comparing the power flow transfer condition and the power grid structure change condition with corresponding parts in the existing power grid fault handling plan, and if the power flow transfer condition and the power grid structure change condition are not consistent, marking or correcting the existing power grid fault handling plan based on the power flow transfer condition and the power grid structure change condition;
and if the existing power grid fault handling plan does not include the preset fault, generating a corresponding part in a new power grid fault handling plan.
Further, after step S102, the method further includes:
if the existing power grid fault handling plan comprises the preset fault, comparing the risk element information or the section information with a corresponding part in the existing power grid fault handling plan, and if the risk element information or the section information is not consistent with the corresponding part in the existing power grid fault handling plan, marking or correcting the existing power grid fault handling plan based on the risk element information or the section information;
and if the existing power grid fault handling plan does not include the preset fault, generating a corresponding part in a new power grid fault handling plan.
Further, after step S103, the method further includes:
if the existing power grid fault handling plan comprises the preset fault, comparing the fault handling measures with corresponding parts in the existing power grid fault handling plan, and if the fault handling measures are not consistent, marking or correcting the existing power grid fault handling plan based on the fault handling measures;
if the fault handling measures in the existing power grid fault handling plan only comprise the adjustment direction, automatically generating the adjustment amount according to a preset rule;
and if the existing power grid fault handling plan does not include the preset fault, generating a corresponding part in a new power grid fault handling plan.
In the embodiment of the invention, if the preset fault handling measures only give the adjustment direction, the specific adjustment amount is automatically provided according to the sensitivity or the priority; if no quantitative measure exists in the plan, the quantitative measure can be supplemented to the plan to serve as an auxiliary decision when a dispatcher operates, and an auxiliary decision suggestion meeting the safety requirement is provided.
FIG. 2 illustrates an electronic troubleshooting protocol report result generated in one embodiment of the present invention. It can be seen that the report result of the electronic fault handling plan includes a power grid basic operation mode, a stability control requirement, an expected fault description, a fault rear formula explanation, a fault assistant decision, a fault handling step, and the like.
In the embodiment, the newly generated power grid fault handling plan is compared with the existing plan, the existing plan is automatically checked and supplemented, the correctness, the effectiveness and the reasonability of the plan can be evaluated, the relevant suggestions for perfecting the plan are given, the decision making calculation is assisted, and the system adjustment strategy is provided.
Fig. 3 shows a schematic structural diagram of a power grid fault handling plan generation apparatus according to an embodiment of the present invention.
As shown in fig. 3, the apparatus includes:
the identification unit 301 is configured to identify a power flow transfer condition and a power grid structure change condition after a preset fault.
In the embodiment of the invention, the preset fault is a fault which is manually set or automatically set (DSA operation in a research state or fault name reading automatic setting is carried out by adopting a graphical operation or a table form) and power grid mode data. And identifying the power flow change and the power grid structure change before and after the fault, namely identifying the conditions of power flow transfer (a support list shows elements with larger power flow change) and power grid structure change (such as disconnection and partition).
And a static safety analysis unit 302, configured to determine section information according to the stability control requirement and the power flow transfer condition, and perform static safety analysis on the operation mode after the preset fault to obtain risk element information and risk section information.
In the embodiment of the invention, the out-of-limit or heavy-load section is found out according to the comparison of the stability control requirement and the actual power flow after the fault, and the section information is obtained; and meanwhile, static safety analysis is carried out according to the operation mode after the fault, and elements and sections with static safety risks after the fault are judged.
And a sensitivity analysis unit 303, configured to perform sensitivity analysis according to the risk element information and the risk section information to obtain a fault handling measure.
In the embodiment of the invention, equipment capable of adjusting voltage and power is provided by adopting a sensitivity analysis method according to risk element information and risk section information, and a specific adjustment strategy, namely a fault handling measure, is obtained.
And a plan generating unit 304, configured to generate a new power grid fault handling plan according to a preset format according to the power flow transfer condition, the power grid structure change condition, the stability control requirement, the risk element information, the risk section information, and the fault handling measure.
In the embodiment of the invention, according to a preset template format, a power grid fault handling plan is automatically generated according to a power flow transfer condition, a power grid structure change condition, a stability control requirement, risk element information, risk section information and fault handling measures, and the modularization information of the power grid fault handling plan is exported to an electronic system.
Further, the grid fault handling protocol includes: the method comprises the steps of plan type and form, plan number, plan name, plan summary information, power grid initial operation mode, operation mode and influence after fault, stability control requirement and fault handling measures.
Specifically, a power grid fault handling plan (referred to as a "plan" for short) is an action plan which is pre-made by a regulation and control organization aiming at a fault possibly occurring in a power grid and for ensuring safe and stable operation of the power grid and rapidly and orderly developing emergency actions, and the contents of the action plan are as follows:
(1) plan type and form
The plan types include: a typical annual mode plan, a special operation mode plan, a natural disaster plan, a special important electricity protection plan, other plans and the like;
the plan form comprises: independent protocols and joint protocols.
(2) Plan number
The plan number is a unique appointed mark of the plan, is concise and easy to identify, and is compiled according to a format of 'regulation and control mechanism code-plan type code-compilation time-plan serial number-plan form code'.
(3) Name of the plan
The plan name should accurately reflect the basic information of the expected failure, and the plan name should be compiled according to the format of 'failure information-key equipment information-other', and should meet the following requirements: 1) and (3) fault information: mandatory items including failure equipment names and failure types; 2) key device information: selecting and filling items including the running state of key equipment, the action condition of a safety automatic device and the like; 3) and others: and (5) selecting a filling item and other information needing to be explained.
(4) Plan summary information
The plan summary information should satisfy the following requirements: 1) the plan summary information comprises a system to which the plan belongs, a plan grade, compiling time, a compiling personnel, a participating regulating and controlling mechanism, a compiling state and the like; 2) the plan summary information should include an initial operation mode overview of the power grid, an operation mode overview after a fault, a main operation risk of the power grid after the fault, and the like.
(5) Initial operation mode of power grid
The initial operation mode of the power grid mainly describes key operation characteristic information of the power grid before a fault occurs, and the key operation characteristic information of the power grid before the fault occurs comprises the following information: 1) power generation and load level; 2) area switching power; 3) a system standby level; 4) the running state of key equipment; 5) critical section or component currents; 6) a safe automatic device state; 7) other information.
(6) Post-fault operating mode and effects
The operation mode and influence after the fault mainly describe the operation state of the power grid after the expected fault occurs, the existing operation risk and influence, and the following information is contained: 1) specific equipment or areas affected by the fault, the action condition of a safety automatic device, the possible running state of the power grid, the level of the caused power grid safety accident and the like; 2) post-fault grid operating conditions include, but are not limited to: the method comprises the following steps of system frequency out-of-limit, power oscillation, section tidal current out-of-limit, main transformer/line tidal current out-of-limit, bus voltage out-of-limit, accident disconnection, full stop of a transformer substation and load loss.
(7) Stability control requirement
The regulation and control mechanism checks the constraint conditions which the given safe and stable operation of the power grid should meet. The requirements for stable control after a fault should be written in a plan and the following requirements are met: 1) defining safety constraint type, constrained equipment or area name and constraint limit value; 2) the security constraint types include: section/tie line current constraints, generator power constraints, voltage constraints, system standby constraints, safety automation and protection strategy constraints, and the like.
(8) Fault handling measures
And (4) taking control measures made for responding to the power grid fault and recovering the normal operation of the power grid as soon as possible. The fault handling measures should use the unified terminology specification and scheduling naming, and should make clear the contents of handling stages, handling operations, information notification, etc., and satisfy the following requirements: 1) the treatment phase includes a control phase, an adjustment phase, and a recovery phase. 2) The treatment operation should be written in sequence from high to low according to the emergency degree of the power grid, and the operation object and the operation type are determined, and the requirements of adjustment amount and treatment time limit are preferably given. 3) Information notification: and reporting the fault condition to a superior control mechanism and reporting the relevant units according to relevant regulations.
Further, the section information includes name, type, out-of-limit power, limit value and out-of-limit percentage of the section, and the risk element information includes name, type, out-of-limit power, limit value and out-of-limit percentage of the risk element.
According to the embodiment, the static safety analysis and the sensitivity analysis before and after the fault are carried out according to the online data, so that the fault handling measures are obtained, and a new power grid fault handling plan is automatically generated, compared with the traditional offline manual plan compiling method which mainly depends on experience, the accuracy and the adaptability of the plan are improved, the plan compiling efficiency is greatly improved, the labor cost is saved, and the batch fault plans can be compiled quickly; meanwhile, the power grid fault handling plan compilation of provincial and above regulation and control mechanisms can be standardized, the working intensity of regulation and control operators is reduced, the major fault cooperative handling capacity is improved, and the safe and stable operation of the power grid is better guaranteed.
Further, the sensitivity analyzing unit 303 is further configured to:
and according to the risk element information and the risk section information, performing sensitivity analysis by adopting the following formula to obtain the sensitivity of each element which can participate in adjustment to the risk element:
wherein the content of the first and second substances,
the active power of the transmission line is used,
for the phase angle of the voltage at the i-side node of the line,
for the phase angle of the voltage at the j-side node of the line,
active power for an adjustable generator or load;
and screening the equipment associated with the risk elements and the risk sections according to the sensitivity and a preset rule, and generating a fault handling measure.
In the embodiment of the present invention, specifically, in terms of the active out-of-limit sensitivity analysis of the device, considering that the influence of the power angle change on the active is much larger than the influence of the voltage change on the active, the simplified sensitivity equation of the power transmission line out-of-limit is as follows:
wherein the content of the first and second substances,
and
can be obtained from the inverse of the Jacobian matrix of the power flow equation,
and
can be calculated by the line power equation pair
And
and obtaining the derivative. Wherein the content of the first and second substances,
may be the active power of the generator; if the element involved in the adjustment is a load and the sensitivity of the load to the risk element needs to be determined, then
May be the active power of the load.
Through the simplified sensitivity equation of the out-of-limit of the power transmission line, the sensitivity of each element which can participate in adjustment to the out-of-limit element (out-of-limit line) and the out-of-limit section in the state is calculated and analyzed, all relevant equipment such as direct current, units or loads are found, sequencing is carried out according to the sensitivity, and the most relevant equipment is found and combined and acted repeatedly.
And calculating an output adjustment value according to the information and the out-of-limit power of the element, carrying the output adjustment value into the power grid data to recalculate the power flow, judging whether the output adjustment value is adjusted to be below a limit value or not, judging whether risk influence is generated on other elements of the power grid or not, if the output adjustment value does not reach the requirement, recalculating the output adjustment value according to the latest risk element and the risk section condition, and repeatedly calculating until the output adjustment value reaches the requirement.
In the embodiment, the fault handling measure calculation based on the on-line static power flow sensitivity analysis and the power flow safety constraint can provide an automatic, efficient and accurate analysis means for power grid fault handling and power flow control, greatly improve the plan compiling efficiency and enable batch fault plans to be compiled quickly.
Further, the apparatus further comprises:
and the thermal stability quota calculating unit is used for forming a thermal stability quota calculating task on the basis of the section required by the stability control to obtain a thermal stability quota result.
In the embodiment of the invention, a thermal stability quota calculation task is formed for a fracture which has a stability control requirement given in a plan or a fracture which needs to be focused, so that a thermal stability quota result is obtained. And moreover, the thermal stability quota calculation task can be issued to the DSA stability margin module and the thermal stability quota result can be transmitted back, and further, the part of the stability control requirement in the plan can be corrected or supplemented. The thermal stability limit calculation unit and the sensitivity analysis unit 303 may be executed concurrently in parallel.
Further, the apparatus further comprises:
the first correction unit is used for comparing the power flow transfer condition and the power grid structure change condition with corresponding parts in the existing power grid fault handling plan if the existing power grid fault handling plan comprises the preset fault, and marking or correcting the existing power grid fault handling plan based on the power flow transfer condition and the power grid structure change condition if the power flow transfer condition and the power grid structure change condition are inconsistent;
meanwhile, the plan generating unit 303 is further configured to generate a corresponding portion in a new power grid fault handling plan if the existing power grid fault handling plan does not include the preset fault.
Further, the apparatus further comprises:
a second correction unit, configured to compare the risk element information or the section information with a corresponding part in an existing power grid fault handling plan if the existing power grid fault handling plan includes the preset fault, and label or correct the existing power grid fault handling plan based on the risk element information or the section information if the risk element information or the section information is inconsistent with the corresponding part in the existing power grid fault handling plan;
meanwhile, the plan generating unit 303 is further configured to generate a corresponding portion in a new power grid fault handling plan if the existing power grid fault handling plan does not include the preset fault.
Further, the apparatus further comprises:
a third correcting unit, configured to compare the fault handling measure with a corresponding portion in an existing power grid fault handling plan if the existing power grid fault handling plan includes the preset fault, and label or correct the existing power grid fault handling plan based on the fault handling measure if the fault handling measure is inconsistent with the corresponding portion in the existing power grid fault handling plan;
the first supplement unit is used for automatically generating an adjustment amount according to a preset rule if the fault handling measures in the existing power grid fault handling plan only comprise an adjustment direction;
meanwhile, the plan generating unit 303 is further configured to generate a corresponding portion in a new power grid fault handling plan if the existing power grid fault handling plan does not include the preset fault.
In the embodiment of the invention, if the preset fault handling measures only give the adjustment direction, the specific adjustment amount is automatically provided according to the sensitivity or the priority; if no quantitative measure exists in the plan, the quantitative measure can be supplemented to the plan to serve as an auxiliary decision when a dispatcher operates, and an auxiliary decision suggestion meeting the safety requirement is provided.
Fig. 2 shows the report results of the electronic troubleshooting protocol generated in one embodiment of the present invention. It can be seen that the report result of the electronic fault handling plan includes a power grid basic operation mode, a stability control requirement, an expected fault description, a fault rear formula explanation, a fault assistant decision, a fault handling step, and the like.
In the embodiment, the newly generated power grid fault handling plan is compared with the existing plan, the existing plan is automatically checked and supplemented, the correctness, the effectiveness and the reasonability of the plan can be evaluated, the relevant suggestions for perfecting the plan are given, the decision making calculation is assisted, and the system adjustment strategy is provided.
The present invention also provides a computer-readable storage medium storing one or more programs which, when executed by one or more processors, implement any of the above-described grid fault handling plan generation methods.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (17)
1. A method for generating a grid fault handling plan, the method comprising:
identifying a power flow transfer condition and a power grid structure change condition after a preset fault;
determining section information according to the stability control requirement and the power flow transfer condition, and simultaneously performing static safety analysis on the operation mode after the preset fault to obtain risk element information and risk section information;
carrying out sensitivity analysis according to the risk element information and the risk section information to obtain a fault handling measure;
and generating a new power grid fault handling plan according to the power flow transfer condition, the power grid structure change condition, the stability control requirement, the risk element information, the risk section information and the fault handling measures and according to a preset format.
2. The method of claim 1, wherein the performing sensitivity analysis based on the risk element information and risk profile information to obtain a fault handling measure comprises:
and according to the risk element information and the risk section information, performing sensitivity analysis by adopting the following formula to obtain the sensitivity of each element which can participate in adjustment to the risk element:
wherein the content of the first and second substances,
the active power of the transmission line is used,
for line i-side node voltageThe phase angle is set to be,
for the phase angle of the voltage at the j-side node of the line,
active power for an adjustable generator or load;
and screening the equipment associated with the risk elements and the risk sections according to the sensitivity and a preset rule, and generating a fault handling measure.
3. The method according to claim 1, wherein the determining section information according to the stability control requirement and the power flow transfer condition, and performing static safety analysis on the operation mode after the preset fault to obtain risk element information and risk section information further comprises:
and forming a thermal stability quota calculation task on the section based on the stability control requirement to obtain a thermal stability quota result.
4. The method of claim 1, wherein after identifying the power flow transfer condition and the grid structure change condition after the preset fault, the method further comprises:
if the existing power grid fault handling plan comprises the preset fault, comparing the power flow transfer condition and the power grid structure change condition with corresponding parts in the existing power grid fault handling plan, and if the power flow transfer condition and the power grid structure change condition are not consistent, marking or correcting the existing power grid fault handling plan based on the power flow transfer condition and the power grid structure change condition;
and if the existing power grid fault handling plan does not include the preset fault, generating a corresponding part in a new power grid fault handling plan.
5. The method according to claim 1, wherein the determining section information according to the stability control requirement and the power flow transfer condition, and performing static safety analysis on the operation mode after the preset fault to obtain risk element information and risk section information further comprises:
if the existing power grid fault handling plan comprises the preset fault, comparing the risk element information or the section information with a corresponding part in the existing power grid fault handling plan, and if the risk element information or the section information is not consistent with the corresponding part in the existing power grid fault handling plan, marking or correcting the existing power grid fault handling plan based on the risk element information or the section information;
and if the existing power grid fault handling plan does not include the preset fault, generating a corresponding part in a new power grid fault handling plan.
6. The method of claim 1, wherein the performing sensitivity analysis according to the risk component information and the risk profile information further comprises, after obtaining a fault handling measure:
if the existing power grid fault handling plan comprises the preset fault, comparing the fault handling measures with corresponding parts in the existing power grid fault handling plan, and if the fault handling measures are not consistent, marking or correcting the existing power grid fault handling plan based on the fault handling measures;
if the fault handling measures in the existing power grid fault handling plan only comprise the adjustment direction, automatically generating the adjustment amount according to a preset rule;
and if the existing power grid fault handling plan does not include the preset fault, generating a corresponding part in a new power grid fault handling plan.
7. The method of claim 1, wherein the grid fault handling protocol comprises: the method comprises the steps of plan type and form, plan number, plan name, plan summary information, power grid initial operation mode, operation mode and influence after fault, stability control requirement and fault handling measures.
8. The method of claim 1, wherein the profile information includes a name, a type, an out-of-limit power, a limit, and an out-of-limit percentage of the profile, and wherein the risk element information includes a name, a type, an out-of-limit power, a limit, and an out-of-limit percentage of a risk element.
9. A grid fault handling plan generating apparatus, the apparatus comprising:
the identification unit is used for identifying the power flow transfer condition and the power grid structure change condition after the preset fault;
the static safety analysis unit is used for determining section information according to the stability control requirement and the power flow transfer condition, and simultaneously performing static safety analysis on the operation mode after the preset fault to obtain risk element information and risk section information;
the sensitivity analysis unit is used for carrying out sensitivity analysis according to the risk element information and the risk section information to obtain a fault handling measure;
and the plan generating unit is used for generating a new power grid fault handling plan according to the power flow transfer condition, the power grid structure change condition, the stability control requirement, the risk element information, the risk section information and the fault handling measures and according to a preset format.
10. The apparatus of claim 9, wherein the sensitivity analysis unit is further configured to:
and according to the risk element information and the risk section information, performing sensitivity analysis by adopting the following formula to obtain the sensitivity of each element which can participate in adjustment to the risk element:
wherein the content of the first and second substances,
the active power of the transmission line is used,
for the phase angle of the voltage at the i-side node of the line,
for the phase angle of the voltage at the j-side node of the line,
active power for an adjustable generator or load;
and screening the equipment associated with the risk elements and the risk sections according to the sensitivity and a preset rule, and generating a fault handling measure.
11. The apparatus of claim 9, further comprising:
and the thermal stability quota calculating unit is used for forming a thermal stability quota calculating task on the basis of the section required by the stability control to obtain a thermal stability quota result.
12. The apparatus of claim 9, further comprising:
the first correction unit is used for comparing the power flow transfer condition and the power grid structure change condition with corresponding parts in the existing power grid fault handling plan if the existing power grid fault handling plan comprises the preset fault, and marking or correcting the existing power grid fault handling plan based on the power flow transfer condition and the power grid structure change condition if the power flow transfer condition and the power grid structure change condition are inconsistent;
meanwhile, the plan generating unit is further configured to generate a corresponding portion in a new power grid fault handling plan if the existing power grid fault handling plan does not include the preset fault.
13. The apparatus of claim 9, further comprising:
a second correction unit, configured to compare the risk element information or the section information with a corresponding part in an existing power grid fault handling plan if the existing power grid fault handling plan includes the preset fault, and label or correct the existing power grid fault handling plan based on the risk element information or the section information if the risk element information or the section information is inconsistent with the corresponding part in the existing power grid fault handling plan;
meanwhile, the plan generating unit is further configured to generate a corresponding portion in a new power grid fault handling plan if the existing power grid fault handling plan does not include the preset fault.
14. The apparatus of claim 9, further comprising:
a third correcting unit, configured to compare the fault handling measure with a corresponding portion in an existing power grid fault handling plan if the existing power grid fault handling plan includes the preset fault, and label or correct the existing power grid fault handling plan based on the fault handling measure if the fault handling measure is inconsistent with the corresponding portion in the existing power grid fault handling plan;
the first supplement unit is used for automatically generating an adjustment amount according to a preset rule if the fault handling measures in the existing power grid fault handling plan only comprise an adjustment direction;
meanwhile, the plan generating unit is further configured to generate a corresponding portion in a new power grid fault handling plan if the existing power grid fault handling plan does not include the preset fault.
15. The apparatus of claim 9, wherein the grid fault handling protocol comprises: the method comprises the steps of plan type and form, plan number, plan name, plan summary information, power grid initial operation mode, operation mode and influence after fault, stability control requirement and fault handling measures.
16. The apparatus of claim 9, wherein the profile information includes a name, a type, an out-of-limit power, a limit, and an out-of-limit percentage of the profile, and the risk element information includes a name, a type, an out-of-limit power, a limit, and an out-of-limit percentage of a risk element.
17. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 8.
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Application publication date: 20210430 |