CN109726482B - Construction method and related device of high-load-density power grid - Google Patents
Construction method and related device of high-load-density power grid Download PDFInfo
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- CN109726482B CN109726482B CN201811640983.XA CN201811640983A CN109726482B CN 109726482 B CN109726482 B CN 109726482B CN 201811640983 A CN201811640983 A CN 201811640983A CN 109726482 B CN109726482 B CN 109726482B
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Abstract
According to the construction method of the high-load-density power grid, partition isolation is achieved in the load center area, the short-circuit current level of the intensive area of a station is remarkably reduced, safety risks caused by power flow transfer among different partitions can be reduced, meanwhile, buses and channels are constructed on the periphery to connect all the partitions, so that the partitions still have strong power mutual agent capacity, the power grid can flexibly adapt to change development of power supplies and loads, and the effect of improving the stability level of the power grid after the partitions is also good. The method comprises the steps of measuring and calculating power profit and loss under different planning scenes based on power grid data, determining power supply requirements such as connection channel requirements and transmission capacity requirements, determining an optimal power grid framework by integrating profit and loss and power supply requirements, and guaranteeing scientific, reasonable and safe development of a power grid. The application also provides a construction system of the high-load-density power grid, a computer readable storage medium and a terminal, which have the beneficial effects.
Description
Technical Field
The present disclosure relates to the field of power configuration, and in particular, to a method and a related apparatus for constructing a high-load-density power grid.
Background
The high-load-density power grid is usually at a load receiving end, the social economy and the economy are developed in the power supply range, the power consumption scale is large, a local power supply is short, and a large amount of power needs to be introduced from the outside. In order to meet the power supply requirement, a large number of transformer substations and power transmission lines are built in a high-load-density power grid, and with the increase of scale, the problems of standard exceeding of short-circuit current, load center tide crossing and the like occur, so that the power grid control and control difficulty is high, and the power failure risk is increasingly prominent. In order to guarantee scientific, reasonable and safe development of a power grid, partition planning is carried out when the receiving end scale and density reach a certain degree, which is the basic requirement of a safety net stability guide rule of a power system, but implementation of partition may cause remarkable reduction of power grid transmission capacity and cause stability problems, and the contradictions limit partition planning implementation of a high-load-density power grid.
Disclosure of Invention
The application aims to provide a construction method, a construction system, a computer readable storage medium and a terminal of a high-load-density power grid, and solves the problem that power grid planning in the prior art is not scientific and reasonable.
In order to solve the above technical problem, the present application provides a method for constructing a high load density power grid, where the high load density power grid includes a load center and a plurality of partitions, a bus is disposed on the periphery of the load center, and each partition maintains an electric interaction agent between the partitions through the bus, and the method specifically includes:
acquiring power grid data of the high-load density power grid;
calculating the power profit and loss of each subarea under different planning scenes according to the power grid data; the electric power profit and loss is the difference between the sum of the power output and the sum of the power supply load;
determining the contact channel requirements of each subarea and the bus according to the power output sum, the power supply load sum and the rated power transmission capacity of a single channel;
calculating the transmission capacity requirement of each section of sub bus according to the power output sum and the power supply load sum; the bus is the sum of all the son and mother lines;
and constructing the high-load density power grid according to the optimal solution of the contact channel demand and the transmission capacity demand.
After the high load density power grid is constructed according to the optimal solution of the contact channel demand and the transmission capacity demand, the method further comprises the following steps:
and performing electrical check on the high-load density power grid.
Wherein electrically checking the high load density power grid comprises:
performing expected fault set tide check and short-circuit current check on the high-load density power grid respectively;
and if the expected fault set power flow check and the short-circuit current check both pass, performing the stability check on the expected fault set.
Wherein, if the element overload occurs when the anticipated fault set tide check is performed on the high load density power grid, the method further comprises the following steps:
increasing the element capacity of the element until the element is flow verified through the anticipated set of faults.
Wherein, if to high load density electric wire netting when carrying out short-circuit current checks that there is fault switch's short-circuit current when exceeding switch and hide section capacity, still include:
and carrying out switch transformation on the fault switch or additionally installing a series reactance device in the near area of the fault switch.
Wherein, if circuit instability occurs during the stability check of the expected fault set, the method further comprises:
and increasing the capacity of the dynamic reactive power device in the instability piece area until the high-load density power grid meets the stability check of the expected fault set.
The application also provides a construction system of the high-load density power grid, and the specific technical scheme is as follows:
the data acquisition module is used for acquiring the power grid data of the high-load density power grid;
the profit and loss measuring and calculating module is used for measuring and calculating the power profit and loss of each subarea under different planning scenes according to the power grid data; the electric power profit and loss is the difference between the sum of the power output and the sum of the power supply load;
the first requirement determining module is used for determining the requirement of a contact channel between each subarea and the bus according to the power output sum, the power supply load sum and the rated power transmission capacity of a single channel;
the second requirement determining module is used for measuring and calculating the transmission capacity requirement of each section of sub bus according to the power output sum and the power supply load sum; the bus is the sum of all the son and mother lines;
and the power grid construction module is used for constructing the high-load density power grid according to the optimal solution of the contact channel demand and the transmission capacity demand.
Wherein, still include:
and the electrical checking module is used for electrically checking the high-load density power grid.
The present application also provides a computer-readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the construction method as described above.
The present application further provides a terminal, which includes a memory and a processor, where the memory stores a computer program, and the processor implements the steps of the above-described construction method when calling the computer program in the memory.
The high load density power grid comprises a load center and a plurality of subareas, wherein a bus is arranged at the periphery of the load center, and each subarea keeps electric interaction between the subareas through the bus, and the construction method specifically comprises the following steps: acquiring power grid data of the high-load-density power grid; calculating the power profit and loss of each subarea under different planning scenes according to the power grid data; the electric power profit and loss is the difference between the sum of the power output and the sum of the power supply load; determining the contact channel requirements of each subarea and the bus according to the power output sum, the power supply load sum and the rated power transmission capacity of a single channel; calculating the transmission capacity requirement of each section of sub bus according to the power output sum and the power supply load sum; the bus is the sum of all the son and mother lines; and constructing the high-load density power grid according to the optimal solution of the contact channel demand and the transmission capacity demand.
According to the power supply and load sharing method, partition isolation is achieved in the load center area, the short-circuit current level of the intensive area of the station is remarkably reduced, the safety risk caused by power flow transfer between different partitions can be reduced, meanwhile, a bus channel is established at the periphery to connect all the partitions, so that the power supply and load sharing capability between all the partitions is still strong, the power supply and load sharing capability can be flexibly adapted to the change and development of the power supply and the load, and the stability level of the power grid after the partitions is improved is also good. The method comprises the steps of measuring and calculating power profit and loss under different planning scenes based on power grid data, determining the demand of a contact channel and the demand of transmission capacity according to the power profit and loss respectively, and determining the optimal power grid framework by integrating the profit and loss and the demand of power supply, so that the scientific, reasonable and safe development of the power grid is guaranteed. The application also provides a construction system of the high-load-density power grid, a computer readable storage medium and a terminal, which have the beneficial effects and are not described herein again.
Drawings
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, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a method for constructing a high load density power grid according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of a bus bar provided herein;
fig. 3 is a schematic diagram of a topological structure of a 2035-year bus-type high-load-density power grid planning scheme for the Guangdong power grid according to an embodiment of the present application;
fig. 4 is a block diagram of a system for constructing a high load density power grid according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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 some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Referring to fig. 1, fig. 1 is a flowchart of a method for constructing a high load density power grid according to an embodiment of the present disclosure, where the high load density power grid includes a load center and a plurality of partitions, a bus is disposed on a periphery of the load center, and each partition maintains electric interaction between the partitions through the bus.
The bus bar is explained first, and needs to be constructed on the periphery of the load center. Generally, the load center refers to a city, especially a large city, which has large power demand and heavy load. By adopting the partition network construction, the average electrical distance between the transformer stations can be increased, and the aims of controlling short-circuit current, weakening the influence between direct currents and the like are fulfilled. Meanwhile, by utilizing a bus network, each subarea is connected to the bus through a plurality of power supply channels, and each subarea has no direct alternating current contact in a load center, so that the wiring mode among the subareas is changed, and the purposes of subarea power supply, distributed direct current and reduction of short-circuit current and accident range are achieved. The mutual support and electric interaction capacity between the subareas are maintained through bus bar communication. It is easy to understand that when the bus is constructed in different regions, the load centers of the local region are fully considered to be partitioned around the load centers, and the bus is constructed. Due to different partitions, bus structures constructed in the same region may be different. The periphery of the load center is usually a predetermined distance from the load center point, and the specific distance meeting the peripheral standard also considers meeting the electrical requirements of the center, etc. The preset distance is not limited, and for example, the distance should be 500kV, and a distance of 70 km to 80 km from the load center can be regarded as the peripheral area.
The construction method specifically comprises the following steps:
s101: acquiring power grid data of the high-load density power grid;
this step is intended to obtain grid data, which may include, but is not limited to, power source (generator set), load, substation, dc feed scale and access point data for a certain period of time in the area, such as the grid data of 2015 in Guangdong province. It should be noted that, the partitioning is usually performed after the grid data is acquired, and the partitioning is performed according to the grid data of different regions, and after the partitioning, the power transmission direction (i.e. the direction of power consumption) and the access point (i.e. the access substation of the power supply) of the large power supply are usually required to be established.
S102: calculating the electric power profit and loss of each subarea under different planning scenes according to the power grid data; the electric power profit and loss is the difference between the sum of the power output and the sum of the power supply load;
when the electric power is calculated, the sum of the power output and the sum of the power supply load need to be calculated firstly. Both data need to consider the number of partitions and the total number of planning scenes. The planning scene refers to a planning scene of a power grid, and checking needs to be performed on different planning scenes after the subsequent power grid is constructed. Different planning scenarios refer to different load and power conditions, usually only considering several extreme conditions.
Specifically, the profit and loss of the power of the partition i in the jth planning scene is
According to the formula
And calculating the profit and loss of the electric power. In the above formula, N is the number of divisions defined by the planner; k is the total number of the planning scenes which are brought into check;
and
and the sum of the power output of the partition i and the sum of the power supply load of the partition i in the jth scene are respectively.
S103: determining the contact channel requirements of each subarea and the bus according to the power output sum, the power supply load sum and the rated power transmission capacity of a single channel;
this step is intended to determine the requirements of the contact channels between the respective partitions and the bus bar, that is to say to determine the number of channels that need to be connected between each partition and the bus bar.
In particular, can be based on
Determining the communication channel requirement of each subarea and the bus, wherein P r Rated transmission capacity for a single channel. Considering factors such as power flow distribution balance, network loss and the like, a certain margin epsilon can be reserved during channel measurement, the value range of the margin epsilon is not limited, and the margin epsilon can be arbitrarily selected from 1.2-1.4.
It is easy to understand that one end point of the channel is positioned above the bus, and the other end point is preferably set by considering the most power-lack position of the partition where the channel is positioned, and on the basis, the short-circuit current of the power grid is ensured not to exceed the standard. The other end point of the channel is arranged at the place where each partition is most lack of power, so that the power supply of the whole region is relatively balanced, and the framework of the power grid is more scientific and reasonable.
S104: calculating the transmission capacity requirement of each section of sub bus according to the power output sum and the power supply load sum;
it should be noted that the bus bar is the sum of all the above-mentioned sub-bus bars, the sub-bus bar refers to each section of bus bar, and this section of bus bar between two channels is usually called a sub-bus bar, and obviously, all the sub-bus bars are connected together to be the bus bar. As shown in fig. 2, the section AB in fig. 2 is a section of sub bus bar. In addition, the sub-buses are divided into a cross-region sub-bus and a non-cross-region sub-bus, in fig. 2, the AB-section sub-bus is a non-cross-region sub-bus, and the BC-section sub-bus is a cross-region character bus, and whether two end points of the sub-buses belong to the same region is distinguished. The requirement for measuring and calculating the transmission capacity of each section of sub-bus can be calculated according to the following formula:
wherein the content of the first and second substances,
and
respectively obtaining the power output sum and the power supply load sum of the r subarea in the planning scene j; if the sub-bus k belongs to a non-cross-zone sub-bus, the transmission capacity requirement of the sub-bus k needs to be superposed with the maximum power exchange between the zone where the sub-bus is located and the sub-bus,
and
and respectively obtaining the power output sum and the power supply load sum of the sub-line k in the scene j. For a power grid with N partitions, corresponding buses are shared
And (4) section.
S105: and constructing the high-load density power grid according to the optimal solution of the contact channel demand and the transmission capacity demand.
After the connection channel requirement and the transmission capacity requirement are determined, the position of the bus can be determined according to the distance from the load center (certainly, the factors such as the power requirement of the load center and the like are considered in the requirement), the number of the channels of each partition and the bus is determined, the end point of each channel in each partition can be arranged in the area with the minimum power shortage of the partition, the specific transmission capacity requirement is also determined, at the moment, the specific architecture mode of the high-load-density power grid can be obtained, and the high-load-density power grid can be obtained through implementation.
According to the embodiment of the application, partition isolation is achieved in the load center area, the short-circuit current level of the dense area of a station is obviously reduced, the safety risk caused by flow transfer among different partitions can be reduced, meanwhile, a bus channel is constructed on the periphery to connect all the partitions, so that all the partitions still have strong electric power mutual compatibility, the power supply and load can be flexibly adapted to change and development, and the effect of improving the stability level of a power grid after the partitions is achieved. The method comprises the steps of measuring and calculating power profit and loss under different planning scenes based on power grid data, determining the demand of a contact channel and the demand of transmission capacity according to the power profit and loss respectively, and determining the optimal power grid framework by integrating the profit and loss and the demand of power supply, so that the scientific, reasonable and safe development of the power grid is guaranteed. The method can effectively meet the high-load power grid partition requirement, has strong operability and has a positive guiding effect on power grid planning and development.
Based on the foregoing embodiment, as a preferred embodiment, after step S105, it is usually necessary to perform electrical check on the obtained high load density power grid, and the specific steps may be as follows:
s106: respectively carrying out expected fault set tide check and short-circuit current check on a high-load density power grid;
s107: and if the expected fault set tide check and the short-circuit current check both pass, performing the stability check on the expected fault set.
The expected fault set load flow check refers to testing a high-load density power grid by using faults possibly occurring in the power grid so as to detect whether elements in the power grid have faults or not, and specifically, detecting whether the element capacity under the expected faults meets requirements or not. If element overload occurs during the expected fault set tide check of the high-load-density power grid, the element capacity of the corresponding (overload) element can be increased until the overloaded element passes the expected fault set tide check. It should be noted that an overload of a component may not only overload one component, but also that there may be a plurality of overloaded components.
The short-circuit current check is usually executed after the expected fault set tide check is passed, the short-circuit current calculation is carried out on the power grid at the moment, and if the short-circuit current of the fault switch exceeds the switch shielding section capacity when the short-circuit current check is carried out on the high-load density power grid, the switch transformation can be carried out on the fault switch or a series reactance device is additionally arranged in the near area of the fault switch.
And after the expected fault set verification and the short-circuit current verification pass, performing stability verification to judge the stability of the power grid during working, and if the circuit is unstable during the expected fault set stability verification, increasing the capacity of the dynamic reactive device in an unstable area until the high-load density power grid meets the expected fault set stability verification. The capacity of the dynamic reactive device can utilize STATCOM, synchronous phase modulators and other equipment.
Based on the above embodiments, a specific application of the present application is provided herein:
the implementation of the method provided by the invention is illustrated by taking the research year of the Guangdong power grid in 2035 as an example. The load density of the Guangdong power grid reaches the highest level all over the world, the problems of over-standard short-circuit current, tidal current ride-through and the like are obvious in the current operation, and the safe and stable operation of the power grid is threatened.
Step 1: and determining basic planning information of load of the Guangdong power grid, direct current feed-in scale, provincial power supply, distribution points of the transformer substation and the like in 2035 years. 4 planning scenes including a basic power supply + offshore wind power low output (scene 1), a basic power supply + offshore wind power large output (scene 2), a sensitive power supply + offshore wind power low output (scene 3) and a sensitive power supply + offshore wind power large output (scene 4) are checked by considering the power supply development uncertainty and the change of the operation condition.
Step 2: planners divide the Guangdong power grid into subareas and formulate a large-scale power supply transmission scheme. Combining the current grid characteristics, geographical environment, source and load distribution and other conditions, the Guangdong power grid is divided into 6 partitions of bead northwest, bead southwest, bead northeast, bead southeast, guangdong and Guangdong. Wherein, the northwest subarea of the bead comprises the northwest part of Guangzhou, the northwest part of Foshan, zhaoqing, yunfao, shaoguan, qingyuan and the like, the southwest subarea of the bead comprises the south part of Guangzhou and the south part of Foshan, zhuhai, jiangmen and Zhongshan and the like, the northeast part of the bead comprises the northeast guan and the northwest China, the southeast part of the bead comprises Shenzhen and the south part of Heizhou, the Guangdong comprises Shantail, shantou, yiyang, meizhou, heyuan and Chaozhou and the like, and the West part of the bead comprises the Maoyang, zhanjiang and Yangjiang and the like. According to the regional power profit and loss conditions, large-scale power supply transmission schemes such as coal power of A & Hu Bay, coal power of Haifeng, shantail offshore wind power, uncovering offshore wind power, lufeng nuclear power, huizhou nuclear power, zhanjiang nuclear power, yangxi coal power, yanjiang offshore wind power and the like are drawn up.
And step 3: and (4) carrying out balance measurement and calculation on the electric power profit and loss of each partition under 4 planning scenes. Wherein, the maximum power exchange requirements of the bead northwest, the bead southwest, the bead northeast, the bead southeast, the Guangdong and the Guangdong with the bus are-7632 MW, -5670MW, -6980MW, -3088MW, +6611MW and +2731MW respectively.
And 4, step 4: and calculating the number of the communication channels between each partition and the bus, wherein epsilon is 1.2, and the rated capacity of a single channel is considered according to 3500MW, and then the number of the communication channels between the northwest of the bead, the southwest of the bead, the northeast of the bead, the southeast of the bead, the east of the Guangdong and the North Guangdong are respectively 3, 2, 3 and 1 through calculation.
And 5: and measuring and calculating the transmission capacity requirement of each section of bus, wherein the capacity requirement of each section of bus is 3612 MW-7730 MW, and each section of bus selects a lead with a cross section of 8 multiplied by 630mm2 (maximum transmission capacity 6100 MW) in consideration of the adaptability of the development of new energy such as offshore wind power and the like. Considering that the power transmission capacity of the bus in the gulf-Shanzhai is still lower than the power transmission demand of the bus in the Shanghai, the load center is additionally provided with 2000MW and 1000MW flexible direct current back-to-back devices respectively, the flexible direct currents belong to a controllable interconnection form, and the problem of uncontrollable power flow transfer and crossing of the load center can not be caused.
Step 6: and (5) building a high-load-density power grid according to the data obtained in the step (4) and the step (5).
And 7: and carrying out tide, short-circuit current and stability check on the planned power grid. And (3) if the planned power grid obtained in the steps 1 to 6 meets the tidal current check under the expected fault, 28 ohm series resistors are required to be additionally arranged on the Wuhua switch station-Fuyuan and Huilong-Aoyan circuits respectively to meet the short-circuit current constraint, and 800MVar STATCOM devices are additionally arranged in 500kV Yangjiang river, transverse draining and Dongguan areas to meet the stability constraint.
The finally obtained topological structure and geographical wiring diagram of the bus type planning scheme outside the Guangdong power grid 2035 year are respectively shown in fig. 3, and fig. 3 is a schematic diagram of the topological structure of the bus type high-load density power grid planning scheme inside the Guangdong power grid 2035 year provided by the embodiment of the application, and 2 groups of series reactance and 4 groups of 200MVar STATCOM devices are cooperatively installed in the scheme.
Meanwhile, electrical checking can be performed on the net rack planning scheme output in the step 8 based on the previous embodiment, and the scheme meets the requirements of tide, short-circuit current and stability.
The following describes a construction system of a high load density power grid provided by an embodiment of the present application, and the construction system described below and the construction method of the high load density power grid described above may be referred to correspondingly.
Fig. 4 is a block diagram of a system for constructing a high load density power grid according to an embodiment of the present application, and the present application further provides a system for constructing a high load density power grid, where the system includes:
a data obtaining module 100, configured to obtain power grid data of the high load density power grid;
the profit and loss measuring and calculating module 200 is used for measuring and calculating the electric power profit and loss of each partition in different planning scenes according to the power grid data; the electric power profit and loss is the difference between the sum of the power output and the sum of the power supply load;
a first requirement determining module 300, configured to determine, according to the sum of power outputs, the sum of power loads, and a rated transmission capacity of a single channel, a requirement of a contact channel between each partition and the bus;
a second requirement determining module 400, configured to measure and calculate a transmission capacity requirement of each segment of sub-bus according to the sum of power output and the sum of power supply load; the bus is the sum of all the son and mother lines;
and a power grid construction module 500, configured to construct the high load density power grid according to the optimal solution of the requirement of the connection channel and the requirement of the transmission capacity.
Based on the above embodiment, as a preferred embodiment, the construction system further includes:
and the electrical checking module is used for electrically checking the high-load density power grid.
Based on the above embodiment, as a preferred embodiment, the electrical checking module may include:
the first checking unit is used for respectively checking expected fault set tide and short-circuit current of the high-load density power grid;
and the second checking unit is used for performing stable checking on the expected fault set if the tide checking and the short-circuit current checking of the expected fault set both pass.
Based on the foregoing embodiment, as a preferred embodiment, if an element overload occurs during the load flow check of the expected fault set for the high load density power grid, the method further includes:
and the first checking processing unit is used for improving the element capacity of the element until the element passes the expected failure set flow checking.
Based on the foregoing embodiment, as a preferred embodiment, if the short-circuit current of the faulty switch exceeds the switch shading capacity when the short-circuit current is checked for the high load density power grid, the method further includes:
and the second check processing unit is used for carrying out switch transformation on the fault switch or additionally installing a series reactance device in the near area of the fault switch.
Based on the foregoing embodiment, as a preferred embodiment, when the circuit is unstable during the expected fault set stability check, the method further includes:
and the third checking and processing unit is used for increasing the capacity of the dynamic reactive power device in the instability piece area until the high-load density power grid meets the stability checking of the expected fault set.
The present application further provides a computer-readable storage medium, on which a computer program is stored, where the computer program can implement the steps of the method for constructing a high load density power grid provided by the foregoing embodiments when executed. The storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The present application further provides a terminal, which may include a memory and a processor, where the memory stores a computer program, and when the processor calls the computer program in the memory, the steps of the method for constructing a high load density power grid provided in the foregoing embodiment may be implemented. Of course, the terminal may also include various network interfaces, power supplies, and the like.
The embodiments are described in a progressive mode in the specification, the emphasis of each embodiment is on the difference from the other embodiments, and the same and similar parts among the embodiments can be referred to each other. For the system provided by the embodiment, the description is relatively simple because the system corresponds to the method provided by the embodiment, and the relevant points can be referred to the description of the method part.
The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A method for constructing a high load density power grid, wherein the high load density power grid comprises a load center and a plurality of partitions, a bus bar is arranged at the periphery of the load center, and each partition maintains electric interaction between the partitions through the bus bar, the method comprising:
acquiring power grid data of the high-load density power grid;
calculating the electric power profit and loss of each subarea under different planning scenes according to the power grid data; the electric power excess and deficiency is the difference between the sum of the power output and the sum of the power supply load;
determining the contact channel requirements of each subarea and the bus according to the power output sum, the power supply load sum and the rated power transmission capacity of a single channel;
calculating the transmission capacity requirement of each section of sub bus according to the power output sum and the power supply load sum; the bus is the sum of all the son and mother lines;
and constructing the high-load density power grid according to the optimal solution of the contact channel demand and the transmission capacity demand.
2. The method of constructing according to claim 1, wherein after constructing the high load density grid according to the optimal solution of the tie-channel demand and the transmission capacity demand, further comprising:
and performing electrical checking on the high-load density power grid.
3. The method of constructing according to claim 2, wherein electrically checking the high load density electrical grid comprises:
performing expected fault set tide check and short-circuit current check on the high-load density power grid respectively;
and if the expected fault set power flow check and the short-circuit current check both pass, performing the stability check on the expected fault set.
4. The method of constructing a power grid system according to claim 3, wherein if an element overload occurs during the expected fault set flow check of the high load density power grid, further comprising:
increasing the element capacity of the element until the element is flow verified through the anticipated set of faults.
5. The method according to claim 3, wherein if the short-circuit current of the fault switch exceeds the switch shading capacity when the short-circuit current of the fault switch is checked for the high load density power grid, the method further comprises:
and carrying out switch transformation on the fault switch or additionally installing a series reactance device in the near area of the fault switch.
6. The method according to any one of claims 3 to 5, further comprising, if a circuit is unstable during the expected fault set stability check:
and increasing the capacity of the dynamic reactive power device in the instability piece area until the high-load density power grid meets the stability check of the expected fault set.
7. A system for constructing a high load density power grid, wherein the high load density power grid comprises a load center and a plurality of partitions, a bus is arranged at the periphery of the load center, each partition maintains electric interaction between the partitions through the bus, and the system comprises:
the data acquisition module is used for acquiring the power grid data of the high-load density power grid;
the profit and loss measuring and calculating module is used for measuring and calculating the electric power profit and loss of each subarea under different planning scenes according to the power grid data; the electric power excess and deficiency is the difference between the sum of the power output and the sum of the power supply load;
the first requirement determining module is used for determining the requirement of a contact channel between each subarea and the bus according to the power output sum, the power supply load sum and the rated power transmission capacity of a single channel;
the second requirement determining module is used for measuring and calculating the transmission capacity requirement of each section of sub bus according to the power output sum and the power supply load sum; the bus is the sum of all the son and mother lines;
and the power grid construction module is used for constructing the high-load density power grid according to the optimal solution of the contact channel demand and the transmission capacity demand.
8. The build system of claim 7, further comprising:
and the electrical checking module is used for electrically checking the high-load density power grid.
9. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the construction method according to any one of claims 1 to 6.
10. A terminal, characterized in that it comprises a memory in which a computer program is stored and a processor which, when it calls the computer program in the memory, carries out the steps of the building method according to any one of claims 1 to 6.
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