CN110932286A - Power distribution network transformation scheme evaluation method and device - Google Patents
Power distribution network transformation scheme evaluation method and device Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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Abstract
The application provides a distribution network transformation scheme evaluation method and device, the application is based on the load variation of a distribution network to be transformed in a certain time in the future, according to the relation characteristic of load and voltage sensitivity, the comprehensive voltage deviation after the transformation of the distribution network to be transformed is predicted, the difference value is obtained with the comprehensive voltage deviation before the transformation, the cost effect ratio is calculated, the evaluation transformation scheme is used as the standard of the evaluation transformation scheme, the problem that the evaluation result is easily influenced by the subjective thinking of personnel when the evaluation scheme is accepted by different transformation schemes in the prior art is solved, and the technical problem that each transformation scheme is objectively measured is difficultly.
Description
Technical Field
The application relates to the technical field of power distribution network engineering management, in particular to a power distribution network modification scheme evaluation method and device.
Background
With the continuous rise of rural and urban power consumption, the increasingly serious low-voltage problem occurs in a part of regional power distribution networks, the operation of power utilization equipment and a power system is damaged, the loss of the power grid is increased, the power supply cost is increased, and the power consumption requirements of residents cannot be met. Therefore, the power distribution network generating low voltage is transformed, rural electric power infrastructure and public service short boards are quickened to be supplemented, and the power consumption requirements of residents in life are met.
Before the actual transformation of the low-voltage project of the power distribution network is implemented, a plurality of sets of effective transformation schemes can exist for the same low-voltage transformation project of the power distribution network, but different transformation schemes are different in cost and effect, an expert evaluation system is adopted for accepting or rejecting different transformation schemes at present, evaluation results are easily influenced by subjective thinking of personnel, and objective measurement of each transformation scheme is difficult to achieve.
Disclosure of Invention
The embodiment of the application provides a power distribution network transformation scheme evaluation method and device, and is used for solving the technical problems that in the prior art, an expert evaluation system is adopted for accepting or rejecting different transformation schemes, evaluation results are easily influenced by subjective thinking of personnel, and objective measurement of each transformation scheme is difficult to achieve.
In view of this, the first aspect of the present application provides a method for evaluating a power distribution network transformation scheme, including:
calculating the predicted transformation cost corresponding to the transformation scheme information according to the obtained transformation scheme information;
obtaining the load variation from the current time node to a first preset time node according to the historical load increase rate of the power distribution network to be reconstructed;
obtaining a predicted comprehensive voltage deviation according to the product of the load variation and a preset first load-voltage sensitivity parameter, wherein the first load-voltage sensitivity parameter is a load-voltage sensitivity parameter of the power distribution network to be modified after the power distribution network is modified based on the modification scheme information;
obtaining a cost effect ratio corresponding to the reconstruction scheme information according to the ratio of the estimated reconstruction cost to the difference between the predicted comprehensive voltage deviation and the reference comprehensive voltage deviation;
the actual comprehensive voltage deviation of the power distribution network to be modified is a voltage deviation obtained according to the product of the load variation of the power distribution network to be modified and a preset second load-voltage sensitivity parameter;
and the second load-voltage sensitivity parameter is the current load-voltage sensitivity parameter of the power distribution network to be modified.
Optionally, the method further comprises:
determining each transformer substation in the power distribution network to be reconstructed, and respectively acquiring the load capacity of each transformer substation and the comprehensive voltage deviation of each transformer substation;
and according to the ratio of the load of each transformer substation to the total load of the power distribution network to be modified, aggregating the comprehensive voltage deviation of each transformer substation in a weighted summation mode to obtain the reference comprehensive voltage deviation of the power distribution network to be modified.
Optionally, the method further comprises:
determining each feeder line under the transformer substation, and respectively acquiring the load capacity of each feeder line and the comprehensive voltage deviation of the feeder line;
and according to the ratio of the load of each feeder line to the total load of the transformer substation, aggregating the comprehensive voltage deviation of each feeder line in a weighted summation mode to obtain the comprehensive voltage deviation of the transformer substation.
Optionally, the method further comprises:
determining each distribution transformer device under the feeder line, and respectively acquiring the load capacity and the distribution transformer comprehensive voltage deviation of each distribution transformer device;
and according to the ratio of the load of each distribution and transformation device to the total load of the feeder line, aggregating each distribution and transformation comprehensive voltage deviation in a weighted summation mode to obtain the feeder line comprehensive voltage deviation of the feeder line.
Optionally, the method further comprises:
determining each user side device under the distribution transformer device, and respectively acquiring the load capacity and the user comprehensive voltage deviation of each user side device;
and according to the ratio of the load of each user side device to the total load of the distribution transformer device, aggregating the user comprehensive voltage deviations in a weighted summation mode to obtain the distribution transformer comprehensive voltage deviation of the distribution transformer device.
This application second aspect provides a distribution network transformation scheme evaluation device, includes:
the cost calculation unit is used for calculating the predicted transformation cost corresponding to the transformation scheme information according to the obtained transformation scheme information;
the load variation calculation unit is used for obtaining the load variation from the current time node to a first preset time node according to the historical load increase rate of the power distribution network to be reconstructed;
the predicted comprehensive voltage deviation calculation unit is used for obtaining a predicted comprehensive voltage deviation according to the product of the load variation and a preset first load-voltage sensitivity parameter, wherein the first load-voltage sensitivity parameter is a load-voltage sensitivity parameter of the power distribution network to be modified after the power distribution network is modified based on the modification scheme information;
the cost-effect ratio calculation unit is used for obtaining a cost-effect ratio corresponding to the transformation scheme information according to the ratio of the predicted transformation cost to the difference between the predicted comprehensive voltage deviation and the reference comprehensive voltage deviation;
the actual comprehensive voltage deviation of the power distribution network to be modified is a voltage deviation obtained according to the product of the load variation of the power distribution network to be modified and a preset second load-voltage sensitivity parameter;
and the second load-voltage sensitivity parameter is the current load-voltage sensitivity parameter of the power distribution network to be modified.
Optionally, the method further comprises:
and the reference comprehensive voltage deviation calculation unit is used for determining each transformer substation in the power distribution network to be modified, respectively acquiring the load of each transformer substation and the comprehensive voltage deviation of the transformer substation, and aggregating the comprehensive voltage deviations of the transformer substations through a weighted summation mode according to the ratio of the load of each transformer substation to the total load of the power distribution network to be modified to obtain the reference comprehensive voltage deviation of the power distribution network to be modified.
Optionally, the method further comprises:
and the transformer substation comprehensive voltage deviation calculation unit is used for determining each feeder line under the transformer substation, respectively acquiring the load of each feeder line and the feeder line comprehensive voltage deviation, and aggregating the feeder line comprehensive voltage deviations through a weighted summation mode according to the ratio of the load of each feeder line to the total load of the transformer substation to obtain the transformer substation comprehensive voltage deviation of the transformer substation.
Optionally, the method further comprises:
and the feeder line comprehensive voltage deviation calculation unit is used for determining each distribution transformer device under the feeder line, respectively acquiring the load of each distribution transformer device and the distribution transformer comprehensive voltage deviation, and aggregating each distribution transformer comprehensive voltage deviation through a weighted summation mode according to the ratio of the load of each distribution transformer device to the total load of the feeder line to obtain the feeder line comprehensive voltage deviation of the feeder line.
Optionally, the method further comprises:
and the distribution transformer comprehensive voltage deviation calculation unit is used for determining each user side device under the distribution transformer device, respectively acquiring the load capacity and the user comprehensive voltage deviation of each user side device, and aggregating each user comprehensive voltage deviation through a weighted summation mode according to the ratio of the load capacity of each user side device to the total load capacity of the distribution transformer device to obtain the distribution transformer comprehensive voltage deviation of the distribution transformer device.
According to the technical scheme, the embodiment of the application has the following advantages:
the application provides in a first aspect a power distribution network transformation scheme evaluation method, including: calculating the predicted transformation cost corresponding to the transformation scheme information according to the obtained transformation scheme information; obtaining the load variation from a first preset time node to a first preset time node according to the historical load increase rate of the power distribution network to be reconstructed; obtaining a predicted comprehensive voltage deviation according to the product of the load variation and a preset first load-voltage sensitivity parameter, wherein the first load-voltage sensitivity parameter is a load-voltage sensitivity parameter of the power distribution network to be modified after the power distribution network is modified based on the modification scheme information; obtaining a cost effect ratio corresponding to the reconstruction scheme information according to the ratio of the estimated reconstruction cost to the difference between the predicted comprehensive voltage deviation and the reference comprehensive voltage deviation; the actual comprehensive voltage deviation of the power distribution network to be modified is a voltage deviation obtained according to the product of the load variation of the power distribution network to be modified and a preset second load-voltage sensitivity parameter; and the second load-voltage sensitivity parameter is the current load-voltage sensitivity parameter of the power distribution network to be modified.
This application is based on the load variation volume of waiting to reform transform the distribution network in future within a definite time, according to load and voltage sensitivity's relational characteristic, the comprehensive voltage deviation after the prediction is waited to reform transform the distribution network, and with this and the comprehensive voltage deviation before reforming transform and ask the difference, at the calculation cost effect ratio, as the standard of aassessment transformation scheme, it all adopts expert's aassessment system to have solved prior art to the choice of different transformation schemes, the aassessment result is influenced by personnel's subjective thinking easily, be difficult to accomplish the technical problem to each transformation scheme of objective measurement.
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In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic flow chart of a first embodiment of a power distribution network transformation scheme evaluation method provided in the present application;
fig. 2 is a schematic flow chart of a power distribution network modification scheme evaluation method according to a second embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a first embodiment of a power distribution network modification scheme evaluation device provided by the present application.
Detailed Description
The embodiment of the application provides a power distribution network transformation scheme evaluation method and device, and is used for solving the technical problems that in the prior art, an expert evaluation system is adopted for accepting or rejecting different transformation schemes, evaluation results are easily influenced by subjective thinking of personnel, and objective measurement of each transformation scheme is difficult to achieve.
In order to make the objects, features and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the embodiments described below are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, a first embodiment of the present application provides a method for evaluating a transformation scheme of a power distribution network, including:
Before the modification scheme is evaluated, the estimated modification cost required for implementing the modification scheme is calculated based on the modification project content in the modification scheme according to the acquired information of the modification scheme.
And 102, obtaining the load variation from the current time node to a first preset time node according to the historical load increase rate of the power distribution network to be modified.
It should be noted that, a historical load increase rate is obtained according to historical load data of the power distribution network to be transformed, and load variation from a current time node to a first future preset time node is estimated on the assumption that the increase rate is unchanged.
And 103, obtaining a predicted comprehensive voltage deviation according to the product of the load variation and a preset first load-voltage sensitivity parameter. The first load-voltage sensitivity parameter is a load-voltage sensitivity parameter of the power distribution network to be modified after the power distribution network is modified based on the modification scheme information.
It should be noted that, according to the load variation obtained in step 102, a product is performed by combining the load-voltage sensitivity parameter, namely the first load-voltage sensitivity parameter, of the power distribution network to be transformed after transformation based on the transformation scheme information, so as to obtain a predicted comprehensive voltage deviation of the power distribution network after transformation and at the first preset time node.
The load-voltage sensitivity is a parameter reflecting the relationship between the voltage change and the load change, and the parameter is influenced by the architecture of the power distribution network, and generally, when the architecture of the power distribution network is determined, the load-voltage sensitivity is a predictable determined constant, so that the modified architecture of the power distribution network can be determined based on the obtained modification scheme, and further, a modified load-voltage sensitivity parameter, namely a first load-voltage sensitivity parameter, is obtained.
Wherein, the relation between the load change and the comprehensive voltage deviation is as follows:
in the formula, Δ P is a load variation amount, δ U is a total voltage deviation, and ξ is a load-voltage sensitivity.
From the relationship between the load change and the integrated voltage deviation, the predicted integrated voltage deviation can be obtained after the load change amount and the load-voltage sensitivity are determined.
And 104, obtaining a cost effect ratio corresponding to the transformation scheme information according to the ratio of the predicted transformation cost to the difference between the predicted comprehensive voltage deviation and the reference comprehensive voltage deviation.
The actual comprehensive voltage deviation of the power distribution network to be modified is a voltage deviation obtained according to the product of the load variation of the power distribution network to be modified and a preset second load-voltage sensitivity parameter, namely a reference comprehensive voltage deviation of the power distribution network which is not modified and is at a first preset time node.
The second load-voltage sensitivity parameter is the current load-voltage sensitivity parameter of the power distribution network to be modified.
It should be noted that, the predicted transformation cost is obtained according to step 101, and the ratio of the predicted transformation cost to the difference between the predicted comprehensive voltage deviation and the reference comprehensive voltage deviation is calculated to obtain the cost-effect ratio corresponding to the transformation scheme information.
The specific calculation formula is as follows:
in the formula, δ U' is the predicted comprehensive voltage deviation, δ U is the actual comprehensive voltage deviation, E is the predicted transformation cost, and C is the cost-effect ratio.
The embodiment of the application is based on the load variation of the power distribution network to be modified in a certain time in the future, according to the relation characteristic of load and voltage sensitivity, the comprehensive voltage deviation after the power distribution network to be modified is predicted, the difference value is calculated according to the comprehensive voltage deviation before the power distribution network is modified, the cost effect ratio is calculated, the standard of the scheme is evaluated and modified, the problem that in the prior art, an expert evaluation system is adopted for accepting or rejecting different modification schemes, the evaluation result is easily influenced by subjective thinking of personnel, and the technical problem that objective measurement of each modification scheme is difficultly achieved is solved.
The above is a detailed description of a first embodiment of the power distribution network modification scheme evaluation method provided by the present application, and the following is a detailed description of a second embodiment of the power distribution network modification scheme evaluation method provided by the present application.
Referring to fig. 2, a second embodiment of the present application provides a method for evaluating a transformation scheme of a power distribution network based on the first embodiment.
Before step 101 of the first embodiment of the present application, the method may further include: ,
and step 1008, aggregating the comprehensive voltage deviation of each transformer substation through a weighted summation mode according to the ratio of the load of each transformer substation to the total load of the power distribution network to be modified, and obtaining the reference comprehensive voltage deviation of the power distribution network to be modified.
Further, step 1007 may be preceded by:
and 1006, aggregating the comprehensive voltage deviation of each feeder line in a weighted summation mode according to the ratio of the load of each feeder line to the total load of the transformer substation to obtain the comprehensive voltage deviation of the transformer substation.
Further, before step 1005, the method may further include:
and 1004, according to the ratio of the load of each distribution transformer device to the total load of the feeder line, aggregating the distribution transformer comprehensive voltage deviations in a weighted summation mode to obtain the feeder line comprehensive voltage deviation of the feeder line.
Further, before step 1003, the method may further include:
It should be noted that the power distribution network is a huge power line network, and the power distribution network architecture thereof sequentially includes, from the upper layer to the lower layer: therefore, when lower-layer equipment is modified, comprehensive voltage deviation of upper-layer equipment is necessarily changed synchronously, for example, if an obtained modification scheme indicates that the modification equipment needs to be modified, at the moment, the comprehensive voltage deviation of the distribution transformer is calculated in an aggregation mode based on the comprehensive voltage deviation and the load capacity of the user side of the unchanged distribution transformer equipment, then the comprehensive voltage deviation of the distribution transformer is calculated step by step based on the new comprehensive voltage deviation of the distribution transformer, the comprehensive voltage deviation of the feeder line and the comprehensive voltage deviation of the substation are obtained in sequence, and finally the reference comprehensive voltage deviation of the distribution network area to be modified is obtained.
The specific calculation formula is as follows:
the method comprises the following steps of taking the voltage deviation of a user side as a basic unit, considering the influence of electricity consumption on the overall voltage quality of a distribution area, taking the ratio of the total electricity consumption of the electricity consumption in the distribution area as a weight, and aggregating distribution transformer comprehensive voltage deviation:
wherein, δ uiVoltage deviation for the ith user; n is the number of users; piIs the user quantity of the user, δ UBecomeAnd (4) distributing and transforming comprehensive voltage deviation.
And (3) aggregating the aggregated distribution transformation comprehensive voltage deviation as a basic unit, and aggregating the feeder line comprehensive voltage deviation by taking the ratio of each distribution transformation load to the total feeder line load as a weight:
wherein, δ UVariable iSynthesizing voltage deviation for the ith distribution transformer; n is the feeder down-configuration variable; siFor distributing loads, delta UThreadComplex voltage deviation of feeder line
Similarly, the transformer substation comprehensive voltage deviation is similar to the distribution transformer and feeder line comprehensive voltage deviation calculation method, and the transformer substation comprehensive voltage deviation is aggregated by taking the feeder line comprehensive voltage deviations under the transformer substation as a basic unit, which is not described herein again.
The following is an example analysis of evaluation by the evaluation method of the present embodiment.
And aggregating the comprehensive voltage deviation of each distribution transformer under the current feeder line by using the voltage of the subscriber end in the transformer area, as shown in the following table 1:
TABLE 1 comprehensive voltage deviation of each distribution transformer
According to the low-voltage treatment scheme, aiming at the current medium-voltage 10Kv line, a series/parallel reactive power compensation device can be additionally arranged, so that the comprehensive voltage qualification rate of distribution transformer with low-voltage problems can be improved, and the normal electricity utilization of residents can be met. Although the scheme can solve the problem that low voltage occurs in the distribution transformation at present and has low cost, the problem of low voltage occurs again along with the increase of the area load. Therefore, on the basis of considering load increase, a 10kV line can be selected to be replaced, the line diameter is increased, and the problem of low voltage of partial distribution transformer is solved. And (4) selecting the two schemes, calculating the cost-effect ratio, and dynamically evaluating the low-voltage treatment effect of the power distribution network. According to historical data, the feeder load increases at a speed of about 5% every year, and the load-voltage sensitivity of the feeder is 1.5 under the current state, namely, the comprehensive voltage deviation of the station area rises by 1.5% every 1% of the load increase.
The problem of low voltage of the feeder line is solved by additionally arranging a series/parallel reactive power compensation device and replacing a 10KV line, and the cost effect of each year after treatment is shown in table 2.
TABLE 2 cost effectiveness ratio of treatment protocol
(1) As shown in Table 2, the 10kV line is selected to be replaced after the load is considered to increase, the improvement of the voltage quality after treatment is obvious, and the comprehensive voltage qualification rate is changed slightly along with the increase of the load, so that the voltage quality level of the region is kept in a reasonable range, and the national power quality requirement is still met after 6 years. And the series/parallel reactive power compensation device is selected to be additionally arranged to treat the low voltage of the feeder line, and although the problem of the low voltage in the area is solved after treatment, the problem of the low voltage appears again after 3 years along with the increase of the load in the area and needs to be treated again.
(2) As shown in table 2, in consideration of load increase, the cost effect is faster than the reduction rate after the 10kV line replacement, and the cost effect is higher than that of the added series/parallel reactive power compensation device in the last 3 years due to the higher investment cost, but rapidly decreases to below the added series/parallel reactive power compensation device with time. Therefore, if a manager only considers the treatment aging of three years, the advantage of adding the reactive power compensation device is greater than that of replacing the line. But the advantages of replacing the 10kV line are far greater than those of additionally arranging the series/parallel reactive power compensation device by combining the requirements of users and countries on the voltage quality and the long-term timeliness of project management.
The above is a detailed description of a second embodiment of the power distribution network modification scheme evaluation method provided by the present application, and the following is a detailed description of a first embodiment of the power distribution network modification scheme evaluation device provided by the present application.
Referring to fig. 3, a third embodiment of the present application provides an evaluation apparatus for a power distribution network transformation scheme, including:
the cost calculation unit 301 is configured to calculate a predicted transformation cost corresponding to the transformation scheme information according to the obtained transformation scheme information;
the load variation calculating unit 302 is configured to obtain a load variation from a current time node to a first preset time node according to a historical load increase rate of the power distribution network to be modified;
the predicted comprehensive voltage deviation calculation unit 303 is configured to obtain a predicted comprehensive voltage deviation according to a product of the load variation and a preset first load-voltage sensitivity parameter, where the first load-voltage sensitivity parameter is a load-voltage sensitivity parameter of the power distribution network to be modified after modification based on the modification scheme information;
a cost-effect ratio calculation unit 304, configured to obtain a cost-effect ratio corresponding to the modification scheme information according to a ratio of the predicted modification cost to a difference between the predicted comprehensive voltage deviation and the reference comprehensive voltage deviation;
the actual comprehensive voltage deviation of the power distribution network to be modified is a voltage deviation obtained according to the product of the load variation of the power distribution network to be modified and a preset second load-voltage sensitivity parameter;
the second load-voltage sensitivity parameter is the current load-voltage sensitivity parameter of the power distribution network to be modified.
Further, still include:
and the reference comprehensive voltage deviation calculation unit 3004 is configured to determine each substation in the power distribution network to be modified, obtain the load amount of each substation and the comprehensive voltage deviation of the substation respectively, and aggregate the comprehensive voltage deviations of each substation through a weighted summation manner according to a ratio of the load amount of each substation to the total load amount of the power distribution network to be modified, so as to obtain the reference comprehensive voltage deviation of the power distribution network to be modified.
Further, still include:
the transformer substation integrated voltage deviation calculating unit 3003 is configured to determine each feeder line under the transformer substation, obtain the load amount of each feeder line and the feeder line integrated voltage deviation, and aggregate the feeder line integrated voltage deviations in a weighted summation manner according to a ratio of the load amount of each feeder line to the total load amount of the transformer substation to obtain the transformer substation integrated voltage deviation of the transformer substation.
Further, still include:
the feeder line comprehensive voltage deviation calculating unit 3002 is configured to determine each distribution transformer device under the feeder line, obtain the load of each distribution transformer device and the distribution transformer comprehensive voltage deviation, and aggregate each distribution transformer comprehensive voltage deviation in a weighted summation manner according to a ratio of the load of each distribution transformer device to the total load of the feeder line to obtain the feeder line comprehensive voltage deviation of the feeder line.
Further, still include:
the distribution transformer comprehensive voltage deviation calculating unit 3001 is configured to determine each user side device under the distribution transformer device, obtain a load amount and a user comprehensive voltage deviation of each user side device, and aggregate the user comprehensive voltage deviations in a weighted summation manner according to a ratio of the load amount of each user side device to a total load amount of the distribution transformer device, so as to obtain the distribution transformer comprehensive voltage deviation of the distribution transformer device.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The terms "first," "second," "third," "fourth," and the like in the description of the application and the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Claims (10)
1. A power distribution network transformation scheme evaluation method is characterized by comprising the following steps:
calculating the predicted transformation cost corresponding to the transformation scheme information according to the obtained transformation scheme information;
obtaining the load variation from the current time node to a first preset time node according to the historical load increase rate of the power distribution network to be reconstructed;
obtaining a predicted comprehensive voltage deviation according to the product of the load variation and a preset first load-voltage sensitivity parameter, wherein the first load-voltage sensitivity parameter is a load-voltage sensitivity parameter of the power distribution network to be modified after the power distribution network is modified based on the modification scheme information;
obtaining a cost effect ratio corresponding to the reconstruction scheme information according to the ratio of the estimated reconstruction cost to the difference between the predicted comprehensive voltage deviation and the reference comprehensive voltage deviation;
the actual comprehensive voltage deviation of the power distribution network to be modified is a voltage deviation obtained according to the product of the load variation of the power distribution network to be modified and a preset second load-voltage sensitivity parameter;
and the second load-voltage sensitivity parameter is the current load-voltage sensitivity parameter of the power distribution network to be modified.
2. The method for evaluating the transformation scheme of the power distribution network to be transformed according to claim 1, further comprising:
determining each transformer substation in the power distribution network to be reconstructed, and respectively acquiring the load capacity of each transformer substation and the comprehensive voltage deviation of each transformer substation;
and according to the ratio of the load of each transformer substation to the total load of the power distribution network to be modified, aggregating the comprehensive voltage deviation of each transformer substation in a weighted summation mode to obtain the reference comprehensive voltage deviation of the power distribution network to be modified.
3. The method for evaluating the transformation scheme of the power distribution network to be transformed according to claim 2, further comprising:
determining each feeder line under the transformer substation, and respectively acquiring the load capacity of each feeder line and the comprehensive voltage deviation of the feeder line;
and according to the ratio of the load of each feeder line to the total load of the transformer substation, aggregating the comprehensive voltage deviation of each feeder line in a weighted summation mode to obtain the comprehensive voltage deviation of the transformer substation.
4. The method for evaluating the transformation scheme of the power distribution network to be transformed according to claim 3, further comprising:
determining each distribution transformer device under the feeder line, and respectively acquiring the load capacity and the distribution transformer comprehensive voltage deviation of each distribution transformer device;
and according to the ratio of the load of each distribution and transformation device to the total load of the feeder line, aggregating each distribution and transformation comprehensive voltage deviation in a weighted summation mode to obtain the feeder line comprehensive voltage deviation of the feeder line.
5. The method for evaluating the transformation scheme of the power distribution network to be transformed according to claim 4, further comprising:
determining each user side device under the distribution transformer device, and respectively acquiring the load capacity and the user comprehensive voltage deviation of each user side device;
and according to the ratio of the load of each user side device to the total load of the distribution transformer device, aggregating the user comprehensive voltage deviations in a weighted summation mode to obtain the distribution transformer comprehensive voltage deviation of the distribution transformer device.
6. The utility model provides a distribution network transformation scheme evaluation device which characterized in that includes:
the cost calculation unit is used for calculating the predicted transformation cost corresponding to the transformation scheme information according to the obtained transformation scheme information;
the load variation calculation unit is used for obtaining the load variation from the current time node to a first preset time node according to the historical load increase rate of the power distribution network to be reconstructed;
the predicted comprehensive voltage deviation calculation unit is used for obtaining a predicted comprehensive voltage deviation according to the product of the load variation and a preset first load-voltage sensitivity parameter, wherein the first load-voltage sensitivity parameter is a load-voltage sensitivity parameter of the power distribution network to be modified after the power distribution network is modified based on the modification scheme information;
the cost-effect ratio calculation unit is used for obtaining a cost-effect ratio corresponding to the transformation scheme information according to the ratio of the predicted transformation cost to the difference between the predicted comprehensive voltage deviation and the reference comprehensive voltage deviation;
the actual comprehensive voltage deviation of the power distribution network to be modified is a voltage deviation obtained according to the product of the load variation of the power distribution network to be modified and a preset second load-voltage sensitivity parameter;
and the second load-voltage sensitivity parameter is the current load-voltage sensitivity parameter of the power distribution network to be modified.
7. The power distribution network transformation scheme evaluation device to be transformed of claim 6, further comprising:
and the reference comprehensive voltage deviation calculation unit is used for determining each transformer substation in the power distribution network to be modified, respectively acquiring the load of each transformer substation and the comprehensive voltage deviation of the transformer substation, and aggregating the comprehensive voltage deviations of the transformer substations through a weighted summation mode according to the ratio of the load of each transformer substation to the total load of the power distribution network to be modified to obtain the reference comprehensive voltage deviation of the power distribution network to be modified.
8. The power distribution network transformation scheme evaluation device to be transformed of claim 7, further comprising:
and the transformer substation comprehensive voltage deviation calculation unit is used for determining each feeder line under the transformer substation, respectively acquiring the load of each feeder line and the feeder line comprehensive voltage deviation, and aggregating the feeder line comprehensive voltage deviations through a weighted summation mode according to the ratio of the load of each feeder line to the total load of the transformer substation to obtain the transformer substation comprehensive voltage deviation of the transformer substation.
9. The power distribution network transformation scheme evaluation device to be transformed of claim 8, further comprising:
and the feeder line comprehensive voltage deviation calculation unit is used for determining each distribution transformer device under the feeder line, respectively acquiring the load of each distribution transformer device and the distribution transformer comprehensive voltage deviation, and aggregating each distribution transformer comprehensive voltage deviation through a weighted summation mode according to the ratio of the load of each distribution transformer device to the total load of the feeder line to obtain the feeder line comprehensive voltage deviation of the feeder line.
10. The power distribution network transformation scheme evaluation device to be transformed of claim 9, further comprising:
and the distribution transformer comprehensive voltage deviation calculation unit is used for determining each user side device under the distribution transformer device, respectively acquiring the load capacity and the user comprehensive voltage deviation of each user side device, and aggregating each user comprehensive voltage deviation through a weighted summation mode according to the ratio of the load capacity of each user side device to the total load capacity of the distribution transformer device to obtain the distribution transformer comprehensive voltage deviation of the distribution transformer device.
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