CN-115659597-B - Power distribution network openable capacity standard calculation simulation method, system and application

CN115659597BCN 115659597 BCN115659597 BCN 115659597BCN-115659597-B

Abstract

The invention belongs to the technical field of power distribution network data processing, and discloses a power distribution network openable capacity standard calculation simulation method, a power distribution network openable capacity standard calculation simulation system and application. The simulation method comprises the steps of obtaining data related to open capacity standard calculation of a power distribution network, solidifying simulation boundary conditions related to the open capacity standard calculation of the power distribution network, and simulating maximum access capacities of distribution transformer, lines and transformer substation sub-scenes respectively to obtain an open capacity calculation result of power distribution network equipment. According to the method, a simulation model is built, the maximum access distributed power capacity simulation of the power distribution network equipment is developed in different scenes, and the maximum access capacities of the 10kV distribution transformer, the 10kV line and the high-voltage transformer substation are simulated in different scenes by adjusting parameters such as line length, equipment capacity, load, distribution, load rate and the like according to the open capacity calculation method and principle of the power distribution equipment, so that simulation results are obtained, and references are provided for the access capacities of the distributed power sources.

Inventors

YAN JUN
ZHANG PENG
LI WENLONG
WANG SHAOFANG
LI WENQI
ZHANG JINPING
WU CAIFENG
SHAN CUNZHI
YUE QING

Assignees

天津天大求实电力新技术股份有限公司

Dates

Publication Date: 20260508
Application Date: 20220927

Claims (9)

1. The calculation simulation method for the openable capacity standard of the power distribution network is characterized by comprising the following steps of: s1, acquiring data related to open capacity standard calculation of a power distribution network; The data comprise historical operation data, operation equipment parameters, actual measurement data of a power grid, power grid and new energy data, construction planning data of a distributed power supply, geographical position data, power grid structure data, operation mode data, load type data, load level data and time scale data; s2, calculating simulation boundary conditions according to the open capacity standard of the solidified power distribution network; the boundary conditions comprise a maximum load rate, voltage deviation, a harmonic current allowable value, a short-circuit current allowable value, a line thermal stability limit load and a line maximum access distributed power supply of the power distribution network equipment; S3, simulating the maximum access capacity of the line, the distribution transformer, the transformer substation and the sub-scene respectively to obtain an openable capacity calculation result of the power distribution network equipment; in step S3, the simulating the maximum access capacity of the line includes: Based on the uniform load distribution model, the decreasing load distribution model, the increasing and decreasing load distribution model and the decreasing and increasing load distribution model, load distribution functions of the load distribution models are sequentially built: ; ; ; ; ; is far from the head end of the line At the load point, i.e. the three-phase load density, in units of P is the transmission of three-phase active power at the beginning of the line, the unit is ; Is the distance from the head end of the line, the unit is ; Is the total length of the line, with the unit of 。
2. The method for simulating calculation of openable capacity standard of power distribution network according to claim 1, wherein in step S3, simulating the maximum access capacity of the power distribution transformer comprises: Distributed photovoltaic capacity ratio = distributed photovoltaic capacity/10 kV distribution transformer capacity x 100%.
3. The method for simulating calculation of openable capacity standard of power distribution network according to claim 1, wherein in step S3, simulating maximum access capacity of a substation comprises: The energy storage capacity configuration at the power grid side, namely reducing the load factor of the transformer substation, peak clipping and valley filling to reduce the load peak Gu Chalv of the power grid, and carrying out the energy storage capacity configuration of the transformer substation in a load reducing mode and peak clipping and valley filling mode; estimating the energy storage capacity configuration of the new energy side in the area by adopting a sample estimation overall method; and (3) configuring the energy storage capacity of the user side, namely estimating the energy storage capacity of the user side in the area by adopting a sample estimation method.
4. A power distribution network openable capacity standard calculation simulation method according to claim 3 wherein reducing the substation load factor comprises: The power of the energy storage device is configured, and the calculation formula is as follows: ; in the formula, The value is selected for the configuration power of the stored energy, For a real-time load power value, Is the heavy-duty power threshold of the substation, The energy storage capacity is calculated according to the following formula based on the selected value of the configuration power of the energy storage: ; in the formula, A value is selected for the energy storage capacity of the configuration, The value is selected for the configuration power of the stored energy, For the heavy-load time of the substation, The operation period is an important load; Peak clipping and valley filling comprises the steps of taking the maximum power limit value of the peak shaving of the power grid by the power of the stored energy, and calculating the power of the stored energy as follows: ; in the formula, A value is selected for the power of the energy storage system, And calculating output requirement values of the energy storage system at all moments, wherein i=1, 2, N, and the energy storage capacity selection formula based on the power selection values of the energy storage system is as follows: ; ; ; Wherein: selecting a value for the energy storage capacity of the energy storage system; and 1~m 1 ,m 2 ～m 3 ,...,m j ～m n is a time period when the energy storage is in a charge-discharge state.
5. The method for simulating calculation of openable capacity standard of power distribution network according to claim 4, wherein the power source side energy storage capacity is configured to obtain an energy storage power variation range curve based on new energy output data and requirements of grid-connected active power variation rate: ; Wherein: To store energy of Output power of the individual samples; the maximum power fluctuation value is 10min before stabilizing; Inputting power for the new energy source to the power grid for a maximum variation allowable value within 10 min; The energy storage demand power obeys normal distribution, and is distributed in a normal way 3 The stored energy power calculation formula is as follows: ; ; ; in the formula, A value is selected for the stored energy power, As an average value of the stored power, For the number of samples to be taken, 、 Respectively mean value and standard deviation of sample data; by utilizing the energy storage power Multiplied by the number of hours of stored energy sustained output The energy storage capacity calculation formula is as follows: , the method for estimating the energy storage capacity configuration of the new energy side in the area by adopting a sample estimation integral method comprises the following steps: 1) The type and the installed capacity of each new energy source in the area are counted, typical new energy source output data including the power change rate and the maximum value of the power change rate are analyzed, and a corresponding power change curve required by energy storage is obtained; 2) And estimating the energy storage capacity configuration requirement of the new energy side in the whole area by using a sample estimation whole method.
6. The method for simulating calculation of openable capacity standard of power distribution network according to claim 3, wherein in the configuration of energy storage capacity at user side, expected values of power shortage caused to user by each power outage are: ; in the formula, As a desired value of the user's shortage of electric power, For the number of hours of production of a user in a year, In order to provide a reliable rate of power supply, To ensure that the user normally produces the required power; the expected value of the energy storage capacity is determined according to the difference of the failure power failure rate before and after the energy storage is put into operation, namely ; Wherein: Is the expected value of the energy storage capacity; the failure power failure rate is the failure power failure rate when the energy storage equipment is not put into; Maximum fault power failure rate allowed for load users; the sample estimation method is adopted to estimate the energy storage capacity configuration of the user side in the area and comprises the following steps: 1) Classifying the user types in the region, and analyzing the load characteristics of the user types according to the typical user load curves in the users in each category, wherein the load characteristics comprise load peaks, peak time periods, load valleys, valley time periods, load average values and load peak-valley differences; 2) Counting the total electric quantity of various user loads in the area, and analyzing the duty ratio of the electric quantity of various user loads; 3) And estimating the energy storage capacity configuration requirements of the user side in the whole area by using a sample estimation whole method, respectively estimating the loads of different types of users, and finally superposing the loads to obtain the whole energy storage capacity configuration.
7. A system for implementing the power distribution network openable capacity standard calculation simulation method according to any one of claims 1 to 6, wherein the power distribution network openable capacity standard calculation simulation system includes: The data acquisition module (1) is used for acquiring data related to open capacity standard calculation of the power distribution network, wherein the data comprises historical operation data, operation equipment parameters, power grid actual measurement data, power grid and new energy, construction planning data of a distributed power supply, geographic positions, a power grid structure, an operation mode, load types, load levels and time scale data; The simulation boundary condition solidifying module (2) is used for solidifying the open capacity standard calculation related simulation boundary conditions of the power distribution network, wherein the boundary conditions comprise the maximum load rate, voltage deviation, harmonic current allowable value, short-circuit current allowable value, line thermal stability limit load and maximum access of the line to the distributed power supply of the power distribution network equipment; and the scene-division simulation calculation module (3) is used for respectively simulating the maximum access capacity of the distribution transformer, the line and the substation in the scene division to obtain the calculation result of the openable capacity of the distribution network equipment.
8. A computer device, characterized in that it comprises a memory and a processor, the memory storing a computer program, which, when executed by the processor, causes the processor to perform the power distribution network openable capacity standard calculation simulation method according to any one of claims 1-6.
9. A computer readable storage medium storing a computer program, wherein the computer program, when executed by a processor, causes the processor to perform the power distribution network openable capacity standard calculation simulation method according to any one of claims 1 to 6.

Description

Power distribution network openable capacity standard calculation simulation method, system and application Technical Field The invention belongs to the technical field of power distribution network data processing, and particularly relates to a power distribution network openable capacity standard calculation simulation method, a power distribution network openable capacity standard calculation simulation system and application. Background The open capacity assessment of the power distribution network is a hotspot and difficulty in power grid planning and operation and maintenance management. The power distribution network equipment is easy to cause heavy overload operation of the power distribution network due to excessive load or new energy, potential safety hazards are generated, reliable power supply and the like, and light load operation is easy to be caused due to less load or new energy, equipment utilization rate is low, and power resources are wasted. Through the analysis, the problems and defects in the prior art are (1) that the data requirements related to the open capacity standard calculation of the power distribution network cannot be defined in the prior art, and the maximum access capacity information cannot be accurately obtained. (2) In the prior art, the related boundary conditions of open capacity standard calculation of the power distribution network cannot be solidified, and the simulation boundary conditions of the maximum access distributed power supply of the 10kV line and the thermal stability limit load of the 10kV line cannot be accurately confirmed. (3) In the prior art, the maximum access capacity simulation of distribution transformer, line and substation sub-scenes is not combined, and typical calculation results of the openable capacity of the distribution network equipment cannot be given. The theoretical support cannot be provided for the actual operation, so that the equipment utilization rate and the power resource utilization rate are poor. Disclosure of Invention In order to overcome the problems in the related art, the embodiment of the invention provides a power distribution network openable capacity standard calculation simulation method, a system and application. The technical scheme is that the power distribution network openable capacity standard calculation simulation method is characterized by comprising the following steps of: The method comprises the steps of S1, acquiring data related to open capacity standard calculation of a power distribution network, wherein the data comprise historical operation data, operation equipment parameters, actual measurement data of a power grid, power grid and new energy data, construction planning data of a distributed power supply, geographical position data, power grid structure data, operation mode data, load type data, load level data and time scale data; S2, calculating simulation boundary conditions according to the open capacity standard of the solidified power distribution network, wherein the boundary conditions comprise maximum load rate, voltage deviation, harmonic current allowable value, short-circuit current allowable value, line thermal stability limit load and maximum access of the line to a distributed power supply of the power distribution network equipment; And S3, simulating the maximum access capacity of the line, the distribution transformer and the substation in the sub-scene respectively to obtain the calculation result of the openable capacity of the distribution network equipment. The simulation of the maximum access capacity of the line comprises the steps of sequentially constructing load distribution functions of each load distribution model based on a uniform load distribution model, a decreasing load distribution model, an increasing load distribution model, a decreasing load distribution model and a decreasing load distribution model, and a decreasing load distribution model: p(x)=P/L; p(x)=2P·x/L2; p(x)=2P·(L-x)/L2; P (x) is the load point three-phase power (i.e. three-phase load density) (kW x km -1) x km from the line head, P is the line head transmitted three-phase active power (kW), x is the distance (km) from the line head, and L is the line total length (km). Simulating the distribution transformer maximum access capacity comprises the steps of distributing photovoltaic capacity accounting for ratio=distributed photovoltaic capacity/10 kV distribution transformer capacity multiplied by 100%. Simulating the maximum access capacity of the transformer substation comprises the steps of configuring the energy storage capacity at the power grid side, namely reducing the load factor of the transformer substation, removing peaks and filling valleys to reduce the load peak Gu Chalv of the power grid, and configuring the energy storage capacity of the transformer substation with reduced load, removed peaks and filled valleys; estimating the energy storage capacity configuration of the new energ