CN113971511A - Substation whole station state evaluation method suitable for multiple voltage levels - Google Patents
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Abstract
The invention discloses a substation whole state evaluation method suitable for multiple voltage levels, which comprises the following steps of: (1) analyzing the wiring mode of the whole substation of the transformer substation, and establishing a multi-level load grade model; (2) analyzing expected accidents of the substation equipment according to the wiring mode of the substation; (3) calculating the expected power supply and shortage of each device in the transformer substation; (4) arranging the expected power supply and shortage quantities from small to large according to the calculated expected power supply and shortage quantities to obtain risk sequencing of each device; (5) and correcting the original weight value in the whole station and interval state evaluation guide rule of the transformer substation according to the risk ranking, and determining the current whole station state of the transformer substation according to the reference value range of the evaluation index where the corrected weight value is located. The assessment method provided by the invention can be suitable for transformer substations with various voltage grades, fills the blank that the state of the whole transformer substation is lack of physical evaluation indexes in the assessment of the state of the whole transformer substation, and is beneficial to improving the assessment capability of the power operation and maintenance department on the state of the whole transformer substation.
Description
Technical Field
The invention belongs to the technical field of equipment state evaluation of power systems, and particularly relates to a substation complete state evaluation method suitable for multiple voltage levels.
Background
The transformer substation is used as a place for receiving and distributing electric energy by a power system, and plays a key role in a power grid operation link. With the increase of the number of the main equipment of the transformer substation and the diversification of the voltage form and the voltage grade of the main equipment, the operation state of the main equipment in the transformer substation is controlled finely, and then the accurate and effective evaluation of the operation state of the whole transformer substation has important practical significance for guaranteeing the safe and stable operation of a national power grid.
At present, there are also many researches on methods for evaluating the state of the whole substation of a substation. Chinese patent CN107633341A discloses a substation complete station state evaluation system and method facing to an equipment owner, wherein the state evaluation method includes the following steps: (1) determining an evaluation index to be evaluated of the whole substation of the transformer substation; (2) presetting parameters for each evaluation index in the step (1), wherein the parameters comprise the weight of each evaluation index participating in calculation, the index value range of each evaluation index participating in calculation, the whole station state of each type of equipment of the transformer substation and the reference value range of each evaluation index corresponding to the whole station state; (3) storing the preset parameters of the step (2) in a storage module; (4) the method comprises the steps that a whole substation state evaluation system of the transformer substation is adopted to evaluate the whole substation state of the transformer substation, and each evaluation index of the whole substation of the transformer substation is detected through a detection module; (5) transmitting each evaluation index detected in the step (4) to a processing module, and processing by the processing module according to a preset evaluation algorithm to obtain a calculated value of each evaluation index; (6) and (3) according to preset parameters stored in the storage module in the steps (2) and (3), judging whether the calculated value of each evaluation index obtained in the step (5) belongs to the index value range of each evaluation index participating in calculation by the evaluation module, and if so, determining the current station completion state of the transformer substation according to the reference value range of each evaluation index where the calculated value is located. The method is only used for reasonably analyzing and processing each evaluation index of the whole substation of the transformer substation, so that the state of the whole substation of the transformer substation is obtained, but the method cannot be used for carrying out state evaluation on equipment at different positions and equipment in different running states in the transformer substation. Chinese patent CN111178739A discloses an assessment method and device for the running state of a transformer substation, wherein the assessment method comprises the steps of obtaining real-time communication data among sub-devices of secondary devices of the transformer substation; evaluating the communication connection between the sub-devices according to the real-time communication data to obtain a first operation state score of the communication connection between the sub-devices; evaluating secondary equipment and a sub-network of the transformer substation according to the first operation state score to obtain a second operation state score of the secondary equipment and a third operation state score of the sub-network, wherein the sub-network is a communication network between the secondary equipment; and evaluating the operation state of the transformer substation according to the second operation state score and the third operation state score to obtain the operation state score of the transformer substation. According to the method, the running state of the secondary equipment and the sub-network of the transformer substation is evaluated for three times mainly through real-time communication data among the sub-equipment of the secondary equipment of the transformer substation, and therefore the running state score of the whole transformer substation is obtained. The method only evaluates the operation state of the secondary equipment communication network of the transformer substation in real time at the present stage, and cannot evaluate the state of the whole transformer substation finely.
The method aims at the problems that the existing research lacks of quantitative evaluation of physical quantities of the whole station state of the transformer station, cannot distinguish the influence degree of equipment at different positions and different running states in the transformer station on the whole station of the transformer station, and further lacks of an evaluation method aiming at the general state of the transformer station with various voltage grades. Therefore, it is necessary to research a novel substation state evaluation method to realize a fine evaluation of the substation state of multiple voltage levels.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a method for evaluating the whole station state of a transformer substation suitable for multiple voltage levels. The method mainly realizes the refined assessment of the whole station state of the transformer substation by analyzing the wiring mode of the transformer substation, analyzing expected accidents, calculating the failure rate and expected power supply and shortage amount of power, sequencing the risks of equipment to the whole station and acquiring the comprehensive deduction value.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for evaluating the whole station state of a transformer substation suitable for multiple voltage levels mainly comprises the following steps:
(1) analyzing the wiring mode of the whole substation of the transformer substation, and establishing a multi-level load grade model according to the wiring mode of the transformer substation;
(2) according to the transformer substation wiring mode in the step (1), performing expected accident analysis on single equipment faults of the transformer substation;
(3) calculating the state probability of the substation system according to the equipment fault probability model, and calculating the expected power supply and shortage amount of each equipment in the substation by combining the result of the expected accident analysis in the step (2);
(4) arranging the expected power supply and shortage amount results of the equipment according to the expected power supply and shortage amount result calculated in the step (3) from small to large so as to obtain risk ranking of the equipment;
(5) according to an evaluation method in 'evaluation guide of whole station and interval state of transformer substation' of a national grid company, multiplying evaluation scores of all devices by correction weight values after risk sorting of all devices to obtain a deduction value of each device, summing the deduction values of all devices to obtain a final deduction value of the whole station of the transformer substation, and determining the current whole station state of the transformer substation according to a reference value range of an evaluation index where the final deduction value of the whole station of the transformer substation is located.
Further, in the step (1), the wiring mode of the substation is determined according to the voltage class of the substation.
Further, the voltage class of the transformer substation is 110kV, 220kV, 330kV and 500 kV.
Further, in the step (2), an enumeration method is adopted to analyze expected accidents of the transformer substation, and the influence on the load power reduction of the whole transformer substation when each device fails is obtained through analyzing the expected accidents of the transformer substation.
Further, the result of the expected accident analysis in the step (3) includes load reduction power and equipment power restoration time.
Further, in the step (3), the substation state probability is obtained by firstly selecting a substation system state through an enumeration method, and then calculating the substation state probability according to a system state probability formula.
Further, the system state probability formula in step (3) is as follows:
where P(s) is the probability of the system state, ndFor the number of failed components, generally 1, only a single failure event is considered; PF (particle Filter)iDisabled component unavailability; lambda [ alpha ]iIs the mean failure rate of the device, which is calculated as the number of historical failures of the device divided by the time, diMTTR represents the mean repair time for a device.
Further, the calculation formula of the expected power supply shortage in the step (3) is as follows:
wherein EENS represents the desired power supply; fiIs the probability that the system is in state i; ciLoad power reduced under the condition of state i; diThe duration of state i can also be expressed in hours or days T of a given time interval.
Compared with the prior art, the invention has the beneficial effects that:
the invention obtains the final grade of the whole station state of the transformer substation by multiplying the equipment evaluation score and the corrected weight value after the equipment risk sorting according to the method of 'the whole station of the transformer substation and the interval state evaluation guide rule' of the national grid company, thereby realizing the refined evaluation of the whole station state of the transformer substation, solving the problems that the physical quantity of the whole station state of the transformer substation is not quantitatively evaluated, the equipment at different positions in the transformer substation cannot be distinguished, the influence degree of the equipment at different running states on the whole station of the transformer substation, the evaluation method aiming at the general state of the transformer substations with various voltage grades and the like in the prior art, and improving the accuracy of the whole station state evaluation of the transformer substation, . Moreover, the assessment method is simple to use, high in feasibility and high in assessment refinement degree, and can provide powerful support for assessment and maintenance of the whole station state of the transformer substation for the power operation and maintenance department.
Drawings
Fig. 1 is a flow chart of a method for evaluating the state of a whole substation of a transformer substation suitable for multiple voltage levels according to the invention;
FIG. 2 is a main wiring mode diagram of a 220kV transformer substation double-bus single-breaker.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
A method for evaluating the whole station state of a transformer substation suitable for multiple voltage levels specifically comprises the following steps:
(1) analyzing the wiring mode of the whole substation of the transformer substation, establishing a multi-level load grade model according to the wiring mode of the transformer substation, and judging the wiring mode of the whole substation of the transformer substation according to the voltage grade of the transformer substation, wherein the voltage grade of the invention is 110kV, 220kV, 330kV and 500 kV;
(2) according to the transformer substation wiring mode in the step (1), performing expected accident analysis on single equipment faults of the transformer substation by adopting an enumeration method, and analyzing the expected accidents of the transformer substation to obtain the influence on the load power reduction of the whole transformer substation when each equipment fault occurs;
(3) calculating the state probability of the substation system according to the equipment fault probability model, and calculating the expected power supply and shortage amount of each equipment in the substation by combining the result of the expected accident analysis in the step (2); the system state probability formula in the step (3) is as follows:
PFi＝λi·di (2)
di＝MTTR/8760 (3)
where P(s) is the probability of the system state, ndFor the number of failed components, generally 1, only a single failure event is considered; PF (particle Filter)iDisabled component unavailability; lambda [ alpha ]iIs the mean failure rate of the device, which is calculated as the number of historical failures of the device divided by the time, diMTTR represents the mean repair time for the device;
the expected power supply and shortage amount of each device is calculated by adopting a formula (4), wherein the formula (4) is as follows:
wherein EENS represents the desired power supply; fiIs the probability that the system is in state i; ciLoad power reduced under the condition of state i; diThe duration of state i, which may also be expressed in hours or days T for a given time interval;
(4) arranging the expected power supply and shortage amount results of the equipment according to the expected power supply and shortage amount result calculated in the step (3) from small to large so as to obtain risk ranking of the equipment;
(5) according to an evaluation method in 'evaluation guide of whole station and interval state of transformer substation' of a national grid company, multiplying evaluation scores of all devices by correction weight values after risk sorting of all devices to obtain a deduction value of each device, summing the deduction values of all devices to obtain a final deduction value of the whole station of the transformer substation, and determining the current whole station state of the transformer substation according to a reference value range of an evaluation index where the final deduction value of the whole station of the transformer substation is located.
The method for evaluating the whole station state of the multi-voltage-level transformer substation is explained in detail by taking a 220kV transformer substation as an example and combining the attached figures 1 and 2, and comprises the following specific steps:
(1) selecting a main wiring mode of a transformer substation and establishing a multi-level load level model, taking a 220kV transformer substation as an example, as shown in FIG. 2, wherein a corresponding wiring mode of the 220kV transformer substation is a double-bus single-breaker wiring mode, and establishing the multi-level load level model according to the wiring mode of each voltage level transformer substation;
(2) performing expected accident analysis on the transformer substation based on an enumeration method, taking a double-bus single-breaker wiring mode corresponding to a 220kV transformer substation as an example, and enabling partial expected accident analysis results to be shown in table 1;
table 1220 kV substation partial expected accident analysis result
(3) Calculating the state probability of a transformer substation system according to historical operation fault probability data of transformer substation equipment, selecting the system state by adopting an enumeration method, wherein the system state probability is calculated by a formula (1):
where P(s) is the probability of the system state, ndThe number of failed components is generally 1; only a single fault event is considered; PF (particle Filter)iIn case of failed component unavailability, wherein PFiThe calculation of (2) is shown in the formulas (2) and (3):
PFi＝λi·di (2)
di＝MTTR/8760 (3)
wherein λ isiIs the mean failure rate of the device, which is calculated as the number of historical failures of the device divided by the time, diMTTR represents the mean repair time for the device;
(4) calculating the expected power supply and shortage amount of each device in the transformer substation according to the state probability of the transformer substation system calculated in the step (3) and the result of the expected accident analysis in the step (2); the expected power supply shortage amount represents the expected number of load demand reduction caused by the shortage of power generation capacity or power grid constraint in a given time interval, and is calculated by the formula (4):
wherein EENS represents the desired power supply, FiIs the probability that the system is in state i, CiLoad power reduced under the condition of state i; diThe duration of state i, which may also be expressed in hours or days T for a given time interval; the specific results of the expected supply and shortage of electricity calculated for the 220kV substation according to equation (4) are shown in table 2:
calculation result of expected power supply and shortage of power of table 2220220 kV transformer substation
(5) According to the expected power supply and shortage of each device in each expected accident mode, risk sequencing is carried out on each device, for example, a 220kV transformer substation, the risks of partial transformer devices are sequentially from small to large: DLT1, #1 master, DL6, DLT 3;
(6) according to the risk ranking of the equipment in the step (5), correcting the original weight in the national grid company 'substation complete station and interval state evaluation guide rule'; taking three circuit breakers in a 220kV transformer substation as an example, the whole substation and interval state evaluation guide rule of the transformer substation stipulates that the weights of all the circuit breakers are 4, and DLT1, DL6 and DLT3 are respectively set to be 3, 4 and 5 according to the risk, so that the influence degree of equipment on the whole substation state of the transformer substation is more accurately evaluated, according to the basic thought of the whole substation and interval state evaluation guide rule of the transformer substation, the deduction value of the whole substation of the transformer substation is obtained by summing the deduction values of all the equipment, the deduction value of each equipment is multiplied by the weight value according to the score corresponding to the evaluation state, the finally obtained result is shown in table 3, the corresponding deduction values of all the equipment in the transformer substation are summed to obtain the final deduction value of the whole substation of the transformer substation, and the current whole substation state of the transformer substation is determined according to the reference value range of the evaluation index where the final deduction value of the whole substation is located.
State evaluation score of breaker in station of table 3220 kV transformer substation
On the basis of the evaluation of the whole substation and interval state evaluation guide of the national grid company, the influence degree of equipment on the whole substation evaluation of the transformer substation is further refined by analyzing the connection mode in the transformer substation, analyzing expected accidents, calculating expected power supply and power shortage and the like, so that the whole substation state of the transformer substation is evaluated more accurately. The assessment method is suitable for the transformer substations with various voltage grades, fills the blank that the state of the whole transformer substation is lack of physical assessment indexes in the current transformer substation state assessment, and is beneficial to improving the assessment capability of the power operation and maintenance department on the state of the whole transformer substation.
Finally, the above preferred embodiments are intended to illustrate rather than to limit the invention, and various changes in form and details may be made therein without departing from the scope of the invention as defined by the appended claims.
Claims (8)
1. A method for evaluating the whole station state of a transformer substation suitable for multiple voltage levels is characterized by mainly comprising the following steps:
(1) analyzing the wiring mode of the whole substation of the transformer substation, and establishing a multi-level load grade model according to the wiring mode of the transformer substation;
(2) according to the transformer substation wiring mode in the step (1), performing expected accident analysis on single equipment faults of the transformer substation;
(3) calculating the state probability of the substation system according to the equipment fault probability model, and calculating the expected power supply and shortage amount of each equipment in the substation by combining the result of the expected accident analysis in the step (2);
(4) arranging the expected power supply and shortage amount results of the equipment according to the expected power supply and shortage amount result calculated in the step (3) from small to large so as to obtain risk ranking of the equipment;
(5) according to an evaluation method in 'evaluation guide of whole station and interval state of transformer substation' of a national grid company, multiplying evaluation scores of all devices by correction weight values after risk sorting of all devices to obtain a deduction value of each device, summing the deduction values of all devices to obtain a final deduction value of the whole station of the transformer substation, and determining the current whole station state of the transformer substation according to a reference value range of an evaluation index where the final deduction value of the whole station of the transformer substation is located.
2. The method for evaluating the state of the whole substation suitable for multiple voltage classes according to claim 1, wherein in the step (1), the wiring mode of the whole substation is determined according to the voltage class of the substation.
3. The method for evaluating the whole station state of the transformer substation suitable for multiple voltage classes according to claim 2, wherein the voltage classes of the transformer substation are 110kV, 220kV, 330kV and 500 kV.
4. The method for evaluating the state of the whole substation of the transformer substation suitable for multiple voltage classes according to claim 1, characterized in that in the step (2), an enumeration method is adopted to analyze expected accidents of the transformer substation, and the influence on the load power reduction of the whole substation of the transformer substation when each device fails is obtained through analyzing the expected accidents of the transformer substation.
5. The method for evaluating the whole station state of the substation suitable for multiple voltage classes according to claim 1, wherein the result of the expected accident analysis in the step (3) comprises load reduction power and equipment restoration power supply time.
6. The method for evaluating the whole substation state of the transformer substation suitable for multiple voltage classes according to claim 1, wherein in the step (3), the state probability of the transformer substation is firstly selected through an enumeration method, and then is calculated according to a system state probability formula.
7. The method for evaluating the whole station state of the transformer substation suitable for multiple voltage classes according to claim 6, wherein the system state probability formula in the step (3) is as follows:
where P(s) is the probability of the system state, ndFor the number of failed components, generally 1, only a single failure event is considered; PF (particle Filter)iDisabled component unavailability; lambda [ alpha ]iIs the mean failure rate of the device, which is calculated as the number of historical failures of the device divided by the time, diMTTR represents the mean repair time for a device.
8. The method for evaluating the whole station state of the substation suitable for multiple voltage classes according to claim 1, wherein the calculation formula of the expected power supply shortage in the step (3) is as follows:
wherein EENS represents the desired power supply; fiIs the probability that the system is in state i; ciLoad power reduced under the condition of state i; diThe duration of state i can also be expressed in hours or days T of a given time interval.
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