CN110930031A - Method, device and equipment for site selection of installation platform area of low-voltage distribution network energy storage device - Google Patents
Method, device and equipment for site selection of installation platform area of low-voltage distribution network energy storage device Download PDFInfo
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Abstract
The application discloses a method, a device and equipment for site selection of an installation area of an energy storage device of a low-voltage distribution network, which comprehensively consider the factors of effectively solving or relieving low voltage, overload, heavy load, network loss and three-phase current imbalance at the tail end of a line in the low-voltage distribution network, analyze the condition of the substation area of the low-voltage distribution network, take the area meeting the site selection requirement of the energy storage device of the low-voltage distribution network as an installable point, establish a set of systematic and scientific site selection flow of the installation area of the energy storage device of the low-voltage distribution network, effectively and reliably realize the site selection of the installation area of the energy storage device of the low-voltage distribution network, do not need to rely on the configuration experience of engineering technicians with rich experience, avoid the defect of reduced configuration reliability of the energy storage device caused by errors caused by human factors, solve the selection mode of the installation position of the existing energy, and the technical problems of selection error caused by artificial factors and low reliability exist.
Description
Technical Field
The application relates to the technical field of low-voltage distribution networks, in particular to a method, a device and equipment for site selection of an installation area of an energy storage device of a low-voltage distribution network.
Background
With the development of power science and technology, the requirement of power consumers on voltage quality is higher and higher, and the problem of low voltage brings much inconvenience to the power consumers, so that the problem of low voltage is needed to be solved by a power provider.
Solving the low-voltage problem with the mode in newly-built platform district is a relatively more general solution at present, but though lift to shorten power supply radius through newly-built, it is the fundamental means who solves the low-voltage problem to improve basic rack level, but current low pressure distribution network energy memory mounted position's selection mode is through artifical experience screening according to experienced engineering technical personnel, it realizes to install energy memory at the reasonable node position of low pressure distribution network, rely on engineering technical personnel's experience level, and there is the selection error that artificial factor leads to, the reliability is lower.
Disclosure of Invention
The application provides a method, a device and equipment for site selection of an installation platform area of a low-voltage distribution network energy storage device, which are used for solving the technical problems that the existing selection mode of the installation position of the low-voltage distribution network energy storage device depends on the experience level of engineering technicians, selection errors caused by artificial factors exist, and the reliability is low.
In view of this, the first aspect of the present application provides a method for locating an installation area of an energy storage device of a low-voltage distribution network, including:
traversing all candidate transformer areas of a preset low-voltage distribution network, and screening out a target transformer area meeting preset constraint conditions, wherein the preset constraint conditions comprise voltage constraint, line loss constraint, three-phase current unbalance constraint, overload and heavy load constraint;
calculating a total risk assessment value of the transformer substation to which the target transformer area belongs, and screening out a target transformer substation of which the total risk assessment value is greater than or equal to a threshold value, wherein the total risk assessment value comprises a tail end voltage assessment value, a line loss rate assessment value, a three-phase current imbalance assessment value and an overload and overload assessment value;
analyzing the risk indexes of the target transformer area of the target transformer substation, and taking the target transformer area, of which the risk indexes do not meet preset standards and belong to a problem list solved by installing an energy storage device, as an energy storage device installable transformer area of the preset low-voltage distribution network, wherein the risk indexes comprise annual maximum load rate, three-phase current, line loss rate, average load rate, terminal voltage minimum value and transformer area power supply radius.
Optionally, the traversing all candidate distribution areas of the preset low-voltage distribution network and screening a target distribution area meeting a preset constraint condition further include:
and pre-screening all distribution areas of the preset low-voltage distribution network, and determining the distribution areas which are accessed with the energy storage devices and bring operation risks to distribution systems at the downstream of the distribution areas to be smaller than a threshold value or meet construction conditions for installing the energy storage devices as the candidate distribution areas.
Optionally, the calculating a total risk assessment value of a substation to which the target substation area belongs, after screening out a target substation of which the total risk assessment value is greater than or equal to a threshold, analyzing a risk indicator of the target substation area of the target substation, and before taking the target substation area, for which the risk indicator does not meet a preset standard and can be solved by installing an energy storage device, as an energy storage device of the preset low-voltage distribution network, where the target substation area can be installed, further includes:
and sequencing the total risk assessment values of all the target substations, and taking the target substation with the maximum total risk assessment value as a target substation to be subjected to target transformer area risk index analysis.
Optionally, the voltage constraint is that the terminal voltage is above 235V or the terminal voltage is below 198V.
Optionally, the line loss constraint is that the line loss rate is greater than 12%.
Optionally, the three-phase current imbalance is constrained to be greater than 10% of the three-phase current imbalance.
The application second aspect provides a net energy memory installation platform district site selection device is joined in marriage to low pressure, includes:
the traversing module is used for traversing all candidate distribution areas of the preset low-voltage distribution network and screening out target distribution areas meeting preset constraint conditions, wherein the preset constraint conditions comprise voltage constraint, line loss constraint, three-phase current unbalance constraint, overload and overload constraint;
the calculation module is used for calculating a total risk assessment value of a transformer substation to which the target transformer area belongs, and screening out a target transformer substation of which the total risk assessment value is greater than or equal to a threshold value, wherein the total risk assessment value comprises a tail end voltage assessment value, a line loss rate assessment value, a three-phase current imbalance assessment value, and an overload and overload assessment value;
and the analysis module is used for analyzing the risk indexes of the target transformer area of the target transformer substation, taking the target transformer area of which the risk indexes do not meet preset standards and belong to a problem list solved by installing an energy storage device as an energy storage device installable transformer area of the preset low-voltage distribution network, wherein the risk indexes comprise annual maximum load rate, three-phase current, line loss rate, average load rate, terminal voltage minimum value and transformer area power supply radius.
Optionally, the method further comprises:
and the pre-screening module is used for pre-screening all the distribution areas of the preset low-voltage distribution network, and determining the distribution areas which are accessed to the energy storage device and bring the operation risk to a distribution system at the downstream of the distribution area to be smaller than a threshold value or meet the construction conditions for installing the energy storage device as the candidate distribution areas.
Optionally, the method further comprises:
and the sequencing module is used for sequencing the total risk assessment values of all the target substations, and taking the target substation with the maximum total risk assessment value as a target substation to be subjected to target transformer area risk index analysis.
The third aspect of the application provides a device for selecting the site of a mounting platform area of a low-voltage distribution network energy storage device, which comprises a processor and a memory, wherein the processor is used for:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute any one of the methods for locating an installation site of a low-voltage distribution network energy storage device according to instructions in the program code.
According to the technical scheme, the embodiment of the application has the following advantages:
the application provides a method for selecting a site of an installation area of an energy storage device of a low-voltage distribution network, which comprises the following steps: traversing all candidate distribution areas of a preset low-voltage distribution network, and screening out a target distribution area meeting preset constraint conditions, wherein the preset constraint conditions comprise voltage constraint, line loss constraint, three-phase current unbalance constraint, overload and heavy load constraint; calculating a total risk assessment value of a transformer substation to which a target station area belongs, and screening out a target transformer substation of which the total risk assessment value is greater than or equal to a threshold value, wherein the total risk assessment value comprises a tail end voltage assessment value, a line loss rate assessment value, a three-phase current imbalance assessment value and an overload and overload assessment value; analyzing the risk indexes of a target transformer area of a target transformer substation, and taking the target transformer area, of which the risk indexes do not meet preset standards and belong to a problem list solved by installing an energy storage device, as an energy storage device installable transformer area of a preset low-voltage distribution network, wherein the risk indexes comprise annual maximum load rate, three-phase current, line loss rate, average load rate, minimum terminal voltage and power supply radius of the transformer area. The method for selecting the site of the installation platform area of the energy storage device of the low-voltage distribution network comprehensively considers the factors of effectively solving or relieving low voltage, overload, heavy load, network loss and unbalanced three-phase current at the tail end of a line in the low-voltage distribution network, analyzes the condition of the substation platform area of the low-voltage distribution network, takes the platform area meeting the site selection requirement of the energy storage device of the low-voltage distribution network as a mountable point, establishes a set of systematic and scientific site selection flow of the installation platform area of the energy storage device of the low-voltage distribution network, effectively and reliably realizes the site selection of the installation platform area of the energy storage device of the low-voltage distribution network, does not need to rely on the configuration experience of engineering technicians with rich experience, avoids the defect that the configuration reliability of the energy storage device is reduced due to errors caused by human factors, solves the selection mode of the installation position of the energy storage device of the existing low-voltage, the reliability is lower.
Drawings
Fig. 1 is a schematic flow chart of a method for selecting a site of an installation area of an energy storage device of a low-voltage distribution network according to an embodiment of the present application;
fig. 2 is another schematic flow chart of a method for locating an installation area of an energy storage device of a low-voltage distribution network according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a device for selecting a site of an installation area of an energy storage device of a low-voltage distribution network, provided in an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments 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.
For easy understanding, please refer to fig. 1, an embodiment of a method for locating a mounting station area of an energy storage device of a low-voltage distribution network according to the present application includes:
It should be noted that, in the embodiment of the present application, first, a station area screening condition of the low-voltage distribution network is established in advance, and all candidate station areas of the target low-voltage distribution network are screened by using voltage constraint, line loss constraint, three-phase current imbalance constraint, overload constraint and overload constraint as screening conditions, and the candidate station areas meeting the screening conditions are screened out as target station areas. It is understood that the candidate station areas may be station areas previously screened by the pre-screening condition.
And 102, calculating a total risk assessment value of the transformer substation to which the target transformer substation belongs, and screening out the target transformer substations of which the total risk assessment value is greater than or equal to a threshold value, wherein the total risk assessment value comprises a tail end voltage assessment value, a line loss rate assessment value, a three-phase current imbalance assessment value and an overload and overload assessment value.
It should be noted that each substation of the low-voltage distribution network may include a plurality of transformer areas, after a target transformer area is screened out, total risk assessment needs to be performed on the substation where the target transformer area is located, so as to obtain a total risk assessment value of each substation, and then the substations of which the total risk assessment value is greater than or equal to a threshold value are screened out as the target substation. The total risk assessment value in the embodiment of the application can be the sum of a terminal voltage assessment value, a line loss rate assessment value, a three-phase current imbalance assessment value and an overload and overload assessment value.
103, analyzing the risk indexes of the target transformer area of the target transformer substation, and taking the target transformer area, of which the risk indexes do not meet the preset standard and belong to the problem list solved by installing the energy storage device, as the energy storage device installable transformer area of the preset low-voltage distribution network, wherein the risk indexes comprise annual maximum load rate, three-phase current, line loss rate, average load rate, minimum terminal voltage and power supply radius of the transformer area.
It should be noted that the risk indicators in the embodiment of the present application may include an annual maximum load rate, a three-phase current, a line loss rate, an average load rate, a minimum terminal voltage value, and a power supply radius of a distribution room, after a target substation is obtained, the risk indicators need to be analyzed for the target distribution room of the target substation, and if the target distribution room whose risk indicators do not meet a preset standard can be solved by installing an energy storage device, the target distribution room is used as an energy storage device installable distribution room of a preset low-voltage distribution network. For example, if a certain target transformer area of a certain target substation has a low terminal voltage, and the failure to meet the voltage constraint is caused by an excessively long line, or has the problems of line overload, heavy load and three-phase current imbalance, which can be solved by installing an energy storage device in the target transformer area, it may be determined that the target transformer area is an installable address of the energy storage device. It can be understood that, regarding the evaluation as to whether the risk indicator does not satisfy the preset standard and can be solved by installing the energy storage device, a list as to whether the risk indicator does not satisfy the preset standard and can be solved by installing the energy storage device can be pre-established, and the factors causing the risk indicator not to satisfy the preset standard are classified, and can be classified into one category by installing the energy storage device and can not be classified into another category by installing the energy storage device.
The method for selecting the site of the installation platform area of the energy storage device of the low-voltage distribution network comprehensively considers the factors of effectively solving or relieving low voltage, overload, heavy load, network loss and three-phase current imbalance at the tail end of a line in the low-voltage distribution network, analyzes the condition of the substation platform area of the low-voltage distribution network, takes the platform area meeting the site selection requirement of the installation of the energy storage device of the low-voltage distribution network as an installable point, establishes a set of site selection flow of the installation platform area of the energy storage device of the low-voltage distribution network, effectively and reliably realizes the site selection of the installation platform area of the energy storage device of the low-voltage distribution network, does not need to rely on the configuration experience of engineering technicians with abundant experience, avoids the defect that the configuration reliability of the energy storage device is reduced due to errors caused by human factors, solves the selection mode of the installation position of the energy storage device of the existing low-voltage distribution, the reliability is lower.
For easy understanding, please refer to fig. 2, in an embodiment of the present application, another embodiment of a method for locating an installation site of an energy storage device of a low-voltage distribution network is provided, including:
It should be noted that, in the embodiment of the present application, all the distribution areas of the preset low-voltage distribution network are pre-screened, and the actual operation effect of the energy storage device of the low-voltage distribution network after installation is considered, and the distribution areas with the number of access users within the range of 10 to 50 are preferentially selected, so that the installation effect of the energy storage device can be fully exerted, and adverse effects on a distribution system at the downstream of the distribution area, which may be brought by the access of the energy storage device, can be prevented; meanwhile, the actual volume and the self weight of the energy storage device are considered, and the later installation and debugging are required to be carried out on the energy storage device, so that certain requirements are met on the geographical environment of erection and construction, and the platform area with potential safety hazards can be eliminated according to the actual situation of on-site investigation. Therefore, the operation risk of the distribution system at the downstream of the distribution area after the energy storage device is connected can not be brought, namely the operation risk is less than 0, or the construction condition for installing the energy storage device is met to serve as the screening condition for pre-screening.
It should be noted that, considering to eliminate the overload and overload phenomena in the low-voltage distribution network, and responding to the short-term load increase in due time, and having capacity expansion requirement, it is necessary to screen out the distribution transformer area with overload, overload and expected overload in the next year. The 220V single-phase supply voltage deviation is + 7% and-10% of the nominal voltage, so in the embodiment of the present application, the voltage constraint may be selected to be that the terminal voltage is higher than 220V + 7% × 220V ═ 235V or that the terminal voltage is lower than 220V-10% × 220V ═ 198V. In the embodiment of the present application, the line loss rate may be used as one of the screening conditions of the target cell, and 12% may be used as the line loss rate index to perform the screening condition of the target cell, that is, if the line loss rate exceeds 12%, the necessity of installing the energy storage device is increased. Generally, the unbalance degree of three-phase load current at the outlet of the distribution transformer is required to be not more than 10%, the unbalance degree of three-phase current at the starting ends of the low-voltage main line and the main branch line is not more than 20%, and the line loss is obviously increased after the unbalance degree of three-phase load current exceeds 10%, so that the unbalance degree of three-phase current of more than 10% is taken as one of the screening conditions of the target platform area in the embodiment of the application.
And 203, calculating a total risk assessment value of the transformer substation to which the target transformer substation belongs, and screening out the target transformer substations of which the total risk assessment value is greater than or equal to a threshold value, wherein the total risk assessment value comprises a tail end voltage assessment value, a line loss rate assessment value, a three-phase current imbalance assessment value and an overload and overload assessment value.
It should be noted that step 203 in the embodiment of the present application is the same as step 102 in the previous step, and is not described herein again.
And 204, sequencing the total risk assessment values of all target substations, and taking the target substation with the maximum total risk assessment value as a target substation to be subjected to target transformer area risk index analysis.
It should be noted that the larger the total risk assessment value is, the more important the research is, the more serious the problem exists in the target substation, and the more the problem diversity is, so after the target substations of which the total risk assessment value is greater than or equal to the threshold are obtained, the target substations of which the total risk assessment value is the maximum may be obtained, and the target substations of which the total risk assessment value is the maximum may be found, and used as the object of risk index analysis.
And 205, analyzing the risk indexes of the target transformer area of the target transformer substation, and taking the target transformer area, of which the risk indexes do not meet the preset standard and belong to the problem list solved by installing the energy storage device, as the energy storage device installable transformer area of the preset low-voltage distribution network, wherein the risk indexes comprise annual maximum load rate, three-phase current, line loss rate, average load rate, minimum terminal voltage and power supply radius of the transformer area.
It should be noted that step 205 in the present embodiment is the same as step 103 in the previous embodiment, and is not described herein again.
In order to more specifically describe the method for selecting the site of the installation station area of the low-voltage distribution network energy storage device in the embodiment of the application, a practical example of the method for selecting the site of the installation station area of the low-voltage distribution network energy storage device is provided below.
And screening and judging relevant station area data according to the actual condition of the low-voltage distribution network, giving corresponding scores when the screening conditions are met, adding the scores, and listing the scores as candidate objects which are relatively higher than the scores of the station areas with more problem overlapping items. Firstly, the distributed energy storage system has a remarkable effect on delaying capacity expansion requirements and solving the problem of low voltage at the tail end of a power grid circuit, so that the distribution value of heavy load, overload and low voltage at the tail end of a power grid of a low-voltage distribution network is 0.3; secondly, the distributed energy storage system has obvious effects of reducing the line loss rate, improving the economic benefit of power supply and solving the problem of unbalanced three-phase current, and the distribution scores are respectively 0.2. The screening condition assignment values are shown in table 1.
TABLE 1
According to the screening condition values in the table 1, comprehensive evaluation is performed on each area to obtain a total risk evaluation value of the distributed energy storage system on the problem improvement degree of each area and the transformer substation of the low-voltage distribution network, and the total risk evaluation value of the transformer substation of a certain low-voltage distribution network is shown in the table 2.
TABLE 2
The total risk assessment value of the transformer substation 1, the transformer substation 4, the transformer substation 5 and the transformer substation 6 is less than 1.0, and the problems of the transformer substation 1, the transformer substation 4, the transformer substation 5 and the transformer substation 6 are single according to relevant data, so that the problems can be solved in the areas through other more economical and effective schemes.
For example, the total evaluation value of the substation 2 is 1.2, and if the line loss rate of each subordinated substation exceeds the standard and the line loss rate is judged to be larger due to the thinner line path of the distribution line, and a list is not solved by adding an energy storage device, the substation area of the substation is not considered as an energy storage system installation address.
The total evaluation values of the transformer substations 3 and 8 are both 1.0, the total evaluation value of the transformer substation 7 is 1.2, and the situation that the overload condition exists in the subordinate individual transformer substation area, the individual transformer substation area has fewer users or the single user has larger power load, the overload probability in the next year is lower, the problem of lack of economy is solved by using an energy storage method, a list solved by adding an energy storage device is not needed, and therefore the transformer substation area is not considered as an energy storage system installation alternative address.
The total evaluation value of the transformer substation 10 is 2.4, the problems are relatively serious, and the transformer substation is mainly caused by a plurality of problems existing in the subordinate transformer areas 1, 2 and 3 and serves as a key research object.
In addition, although the evaluation scores of the transformer substation 11 and the transformer substation 9 are both 1.0, if it is assumed that the problems of the subordinate individual transformer substations (the transformer substation 9 and the transformer substation 11) are more prominent (for example, three imbalance conditions are particularly serious, the load rate approaches or exceeds 100%, the terminal voltage exceeds the limit value, and the like), the evaluation scores also should be taken as the candidate objects. A substation area screening example is shown in table 3.
TABLE 3
As can be seen from table 3, the line end of the transformer substation 10 zone 1 has a problem of low voltage due to the fact that the radius of the line is too long, 700m, and a heavy load condition occurs, although the line loss rate is within the recommended value range, the line loss rate is relatively high. In principle, a distributed energy storage system can be considered as a scheme for simultaneously solving the problems of low voltage, line loss improvement and heavy load alleviation, but the maximum value can reach 28kW from the perspective of user installation capacity, and the distributed energy storage system with small capacity is not suitable for solving the problems. In addition, the solution to be adopted in power grid planning is to replace a low-voltage cable, and the solution can reduce line loss and improve the terminal voltage.
The transformer substation 11 area 1 mainly has overload, heavy load and three-phase current unbalance problems, and the overload problem is expected to occur in the next year, and the line loss rate is relatively large although within the recommended range. The problems can be solved or relieved by adopting distributed energy storage, but the three-phase current imbalance degree is large, and the problems can be relieved by correspondingly adjusting the three-phase load due to the fact that the heavy load and the overload are possibly caused by the overlarge single-phase load. Therefore, the area is not considered as the installation address of the energy storage system of the project.
The transformer station 10 area 1 mainly has the problems of large line loss rate and heavy load, which are mainly caused by small capacity of a distribution transformer, long commissioning time and equipment aging, the problem of transformer loss cannot be well solved by using an energy storage device, and the more economic solution adopted in power grid planning is distribution, capacity increase and distribution box replacement, so that the transformer station 10 area 1 is not used as an energy storage system installation address.
The transformer station 10 transformer station area 2 mainly has the problems that due to low voltage caused by overlong lines, the transformer station 10 transformer station area 3 has the problems of line overload, heavy load and unbalanced three-phase current, the problem of low voltage is solved by adopting a distributed energy storage system, meanwhile, the network loss is reduced, the utilization rate of the existing equipment is improved, and the capacity expansion investment risk is reduced, so that the transformer station areas of the transformer station 10 transformer station area 2 and the transformer station 10 transformer station area 3 are used as alternative energy storage system installation addresses.
In summary, the transformer substation 10 area 2 or the transformer substation 10 area 3 can be selected as a better installation position of the low-voltage distribution network distributed energy storage device.
For easy understanding, please refer to fig. 3, an embodiment of a device for locating a mounting station area of a low-voltage distribution network energy storage device is provided in the present application, including:
and the traversing module is used for traversing all candidate distribution areas of the preset low-voltage distribution network and screening out target distribution areas meeting preset constraint conditions, wherein the preset constraint conditions comprise voltage constraint, line loss constraint, three-phase current unbalance constraint, overload and heavy load constraint.
And the calculation module is used for calculating a total risk assessment value of the transformer substation to which the target transformer substation belongs, and screening out the target transformer substations of which the total risk assessment value is greater than or equal to a threshold value, wherein the total risk assessment value comprises a tail end voltage assessment value, a line loss rate assessment value, a three-phase current imbalance assessment value, and an overload and overload assessment value.
And the analysis module is used for analyzing the risk indexes of the target transformer area of the target transformer substation, and taking the target transformer area, which does not meet the preset standard and can be solved by installing the energy storage device, as the energy storage device installable transformer area of the preset low-voltage distribution network, wherein the risk indexes comprise annual maximum load rate, three-phase current, line loss rate, average load rate, minimum terminal voltage and transformer area power supply radius.
Further, the method can also comprise the following steps:
and the pre-screening module is used for pre-screening all the distribution areas of the preset low-voltage distribution network, and determining the distribution areas which can not bring operation risks to a distribution system at the downstream of the distribution areas after being connected with the energy storage device or meet the construction conditions for installing the energy storage device as candidate distribution areas.
Further, the method can also comprise the following steps:
and the sequencing module is used for sequencing the total risk assessment values of all target substations, and taking the target substation with the maximum total risk assessment value as the target substation to be subjected to target transformer area risk index analysis.
The application also provides an embodiment of a low-voltage distribution network energy storage device installation area site selection device, which comprises a processor and a memory:
the memory is used for storing the program codes and transmitting the program codes to the processor;
the processor is used for executing any one of the low-voltage distribution network energy storage device installation area site selection methods in the low-voltage distribution network energy storage device installation area site selection method embodiments according to the instructions in the program codes.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, 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 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 application 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 application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in 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 application. 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.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A method for selecting a site of an installation area of an energy storage device of a low-voltage distribution network is characterized by comprising the following steps:
traversing all candidate transformer areas of a preset low-voltage distribution network, and screening out a target transformer area meeting preset constraint conditions, wherein the preset constraint conditions comprise voltage constraint, line loss constraint, three-phase current unbalance constraint, overload and heavy load constraint;
calculating a total risk assessment value of the transformer substation to which the target transformer area belongs, and screening out a target transformer substation of which the total risk assessment value is greater than or equal to a threshold value, wherein the total risk assessment value comprises a tail end voltage assessment value, a line loss rate assessment value, a three-phase current imbalance assessment value and an overload and overload assessment value;
analyzing the risk indexes of the target transformer area of the target transformer substation, and taking the target transformer area, of which the risk indexes do not meet preset standards and belong to a problem list solved by installing an energy storage device, as an energy storage device installable transformer area of the preset low-voltage distribution network, wherein the risk indexes comprise annual maximum load rate, three-phase current, line loss rate, average load rate, terminal voltage minimum value and transformer area power supply radius.
2. The method for locating the installation areas of the energy storage devices of the low-voltage distribution network according to claim 1, wherein all candidate areas of the low-voltage distribution network are traversed and preset, and a target area meeting preset constraint conditions is screened, and the method further comprises the following steps:
and pre-screening all distribution areas of the preset low-voltage distribution network, and determining the distribution areas which are accessed with the energy storage devices and bring operation risks to distribution systems at the downstream of the distribution areas to be smaller than a threshold value or meet construction conditions for installing the energy storage devices as the candidate distribution areas.
3. The method for locating the installation areas of the energy storage devices of the low-voltage distribution network according to claim 1, wherein after the total risk assessment value of the substation to which the target area belongs is calculated, and a target substation with the total risk assessment value greater than or equal to a threshold value is screened out, the risk indicator of the target area of the target substation is analyzed, and before the target area with the risk indicator which does not meet a preset standard and belongs to a problem list solved by installing the energy storage device is used as the installation area of the energy storage device of the preset low-voltage distribution network, the method further comprises:
and sequencing the total risk assessment values of all the target substations, and taking the target substation with the maximum total risk assessment value as a target substation to be subjected to target transformer area risk index analysis.
4. The method of claim 1, wherein the voltage constraint is that a terminal voltage is higher than 235V or a terminal voltage is lower than 198V.
5. The method of claim 1, wherein the line loss constraint is a line loss rate greater than 12%.
6. The method for locating the mounting table area of the energy storage device of the low-voltage distribution network according to claim 1, wherein the three-phase current unbalance is constrained to be more than 10% of the three-phase current unbalance.
7. The utility model provides a net energy memory device mount table district site selection device is joined in marriage to low pressure which characterized in that includes:
the traversing module is used for traversing all candidate distribution areas of the preset low-voltage distribution network and screening out target distribution areas meeting preset constraint conditions, wherein the preset constraint conditions comprise voltage constraint, line loss constraint, three-phase current unbalance constraint, overload and overload constraint;
the calculation module is used for calculating a total risk assessment value of a transformer substation to which the target transformer area belongs, and screening out a target transformer substation of which the total risk assessment value is greater than or equal to a threshold value, wherein the total risk assessment value comprises a tail end voltage assessment value, a line loss rate assessment value, a three-phase current imbalance assessment value, and an overload and overload assessment value;
and the analysis module is used for analyzing the risk indexes of the target transformer area of the target transformer substation, taking the target transformer area of which the risk indexes do not meet preset standards and belong to a problem list solved by installing an energy storage device as an energy storage device installable transformer area of the preset low-voltage distribution network, wherein the risk indexes comprise annual maximum load rate, three-phase current, line loss rate, average load rate, terminal voltage minimum value and transformer area power supply radius.
8. The low-voltage distribution network energy storage device mounting area site selection device of claim 7, further comprising:
and the pre-screening module is used for pre-screening all the distribution areas of the preset low-voltage distribution network, and determining the distribution areas which are accessed to the energy storage device and bring the operation risk to a distribution system at the downstream of the distribution area to be smaller than a threshold value or meet the construction conditions for installing the energy storage device as the candidate distribution areas.
9. The low-voltage distribution network energy storage device mounting area site selection device of claim 7, further comprising:
and the sequencing module is used for sequencing the total risk assessment values of all the target substations, and taking the target substation with the maximum total risk assessment value as a target substation to be subjected to target transformer area risk index analysis.
10. The utility model provides a net energy memory device installation platform district site selection equipment is joined in marriage to low pressure which characterized in that, the equipment includes treater and memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the method for locating the installation site of the low-voltage distribution network energy storage device according to any one of claims 1 to 6 according to instructions in the program codes.
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