CN-122026425-A - Distributed photovoltaic digestion method and system considering difference of different-level operation targets

CN122026425ACN 122026425 ACN122026425 ACN 122026425ACN-122026425-A

Abstract

A distributed photovoltaic digestion method and system considering different levels of operation target difference comprises the steps of constructing an operation constraint model of a provincial power grid and devices in a power distribution network, constructing a photovoltaic digestion model of a feeder area, calculating to obtain equivalent source load characteristics of all areas of the feeder area, constructing a photovoltaic digestion model of a county level, constructing a power balance constraint based on the equivalent source load characteristics of all areas of the feeder area, calculating to obtain equivalent source load characteristics of all county nodes, constructing a provincial power grid photovoltaic digestion model, calculating to obtain an upper limit value of receiving photovoltaic dumping power of the provincial power grid based on the equivalent source load characteristics of all county nodes as a model constraint, calculating to obtain acceptable photovoltaic dumping power of the provincial power grid, and calculating a part to be reduced in all photovoltaic dumping power of the county, wherein the photovoltaic dumping power of the county is reduced according to the sequence of firstly reducing concentrated photovoltaic dumping power and then reducing distributed photovoltaic dumping power. The invention can effectively improve the absorption capacity of the photovoltaic.

Inventors

LIU YANG
WANG JINGGANG
SUN XIN
LIU ZHE
CAO YAXIN
CHEN LIJUAN

Assignees

国网河南省电力公司电力科学研究院
东南大学

Dates

Publication Date: 20260512
Application Date: 20251225

Claims (10)

1. A distributed photovoltaic digestion method that accounts for differences in operational objectives of different levels, comprising: Step 1, constructing an operation constraint model of each device in a provincial power grid and a power distribution network; Step 2, constructing a photovoltaic absorption model of the feeder line area based on the operation constraint model of each device, and calculating to obtain equivalent source load characteristics of each area of the feeder line area; Step 3, constructing a photovoltaic digestion model of a county level, constructing a power balance constraint based on equivalent source load characteristics of each area of a feeder line platform area, and solving the photovoltaic digestion model of the county level to obtain the equivalent source load characteristics of each county node; step 4, constructing a photovoltaic digestion model of the provincial power grid, calculating an upper limit value of the provincial power grid for admitting photovoltaic reverse power based on the equivalent source load characteristics of the provincial power grid and the county nodes, taking the upper limit value as the constraint of the photovoltaic digestion model of the provincial power grid, and calculating to obtain the acceptable photovoltaic reverse power of the provincial power grid; and 5, calculating the part to be cut in all the photovoltaic power of the county based on the photovoltaic power which is acceptable by the provincial power grid, and finishing the cutting of the photovoltaic power of the county according to the sequence of firstly cutting the centralized photovoltaic power and then cutting the distributed photovoltaic power.
2. The distributed photovoltaic digestion method taking into account the differences in operating targets at different levels as recited in claim 1, wherein: The photovoltaic digestion model of the feeder line area has an objective function of the minimum sum of the light rejection cost, the energy storage operation cost, the interaction cost with an upper power grid and the network loss cost of the feeder line area, the photovoltaic digestion model of the county level has an objective function of the minimum sum of the light rejection cost, the energy storage operation cost and the interaction cost with the upper power grid of the county, and the photovoltaic digestion model of the provincial power grid has an objective function of the minimum sum of the light rejection cost, the energy storage operation cost and the thermal power cost.
3. The distributed photovoltaic digestion method taking into account the differences in the operational objectives of different levels according to claim 2, wherein: In step 3, a power balance constraint is constructed based on the equivalent source load characteristics of each region of the feeder station region, wherein the power balance constraint is specifically: Wherein, the Is county of the area Personal node number The charging power of the energy storage system at each moment, Is county of the area Personal node number The discharge power of the energy storage system at each moment, 、 Respectively county of the region Personal node number Net injection of active and reactive power at each moment; 、 respectively county of the region Personal node number Active and reactive power interacted with the provincial power grid at each moment; 、 respectively county of the region Personal node number Active and reactive power of the load at each moment; 、 The sum of the active net power and the reactive net power of equivalent source load characteristics of each feeder line area governed by the ith node of county at the t moment is respectively; Is county of the area Personal node number Actual amount of photovoltaic absorption for each period.
4. A distributed photovoltaic digestion method taking into account the differences in the operational objectives of different levels according to claim 2 or 3, characterized in that: in step 4, the upper limit value of the photovoltaic reverse power received by the provincial power grid is determined according to the following mode: Wherein, the Active power representing interaction of mth node of corresponding county with upper grid when photovoltaic absorption model objective function of kth county takes minimum value M is the total number of nodes contained in the kth county, and K is the total number of counties contained in the ith node in the provincial power grid.
5. The distributed photovoltaic digestion method taking into account the differences in operating targets at different levels as recited in claim 4, wherein: in step 4, in the photovoltaic absorption model of the provincial power grid, the power balance constraint is constructed based on the equivalent source load characteristics of each county node, and specifically comprises the following steps: Wherein, the In the provincial power grid Personal node number The charging power of the energy storage system at the moment, In the provincial power grid Personal node number The pumped storage power of the hydropower plant at any moment, In the provincial power grid Personal node number The power generated by the hydropower plant at the moment, In the provincial power grid Personal node number The power generated by the thermal power plant at the moment, In the provincial power grid Personal node number The discharge power of the energy storage system at the moment, In the provincial power grid Personal node number The generated power of the wind power plant at any moment, In the provincial power grid Personal node number The net injection power at the moment in time, In the provincial power grid Personal node number Photovoltaic power at the provincial power grid level consumed at the moment, In the provincial power grid Personal node number The superposition sum of the corresponding net active power of the equivalent source load characteristics of each county corresponding to the moment at the t moment, In the provincial power grid Personal node number The load power at the moment in time, In the provincial power grid Personal node number The moment can receive the power inverted by the power grid of the lower county.
6. The distributed photovoltaic digestion method taking into account the difference of different levels of operational targets according to claim 1 or 5, characterized in that: and 5, calculating the power of all the photovoltaic reverse sending of the county according to the mode that the net power of the equivalent source load characteristics of all the nodes in the county is summed to obtain the power of the photovoltaic reverse sending of the county, and the power of all the county governed by all the nodes of the provincial power grid is summed to obtain the power of all the photovoltaic reverse sending of the county corresponding to the nodes of the provincial power grid.
7. A distributed photovoltaic digestion system taking into account differences in operational targets at different levels based on the method of any one of claims 1-6, comprising an equipment model building module, a feeder-line-area photovoltaic digestion model building module, a county-level photovoltaic digestion model building module, a provincial-level grid photovoltaic digestion model building module, and a county photovoltaic reverse power reduction module, characterized in that: the equipment model construction module is used for constructing an operation constraint model of each equipment in the provincial power grid and the power distribution network; The photovoltaic absorption model construction module of the feeder area is used for constructing a photovoltaic absorption model of the feeder area based on the operation constraint model of each device, and calculating to obtain the equivalent source load characteristics of each area of the feeder area; The system comprises a county-level photovoltaic absorption model construction module, a power balance constraint construction module and a power balance constraint module, wherein the county-level photovoltaic absorption model construction module is used for constructing a county-level photovoltaic absorption model, and the power balance constraint is constructed based on equivalent source load characteristics of each area of a feeder line platform area, and the county-level photovoltaic absorption model is solved to obtain equivalent source load characteristics of each county node; the provincial power grid photovoltaic digestion model construction module is used for constructing a photovoltaic digestion model of the provincial power grid, calculating an upper limit value of the provincial power grid for admitting photovoltaic reverse power based on the equivalent source load characteristics of all county nodes, taking the upper limit value as the constraint of the provincial power grid photovoltaic digestion model, and calculating the acceptable photovoltaic reverse power of the provincial power grid; And the county photovoltaic reverse power reduction module is used for calculating and obtaining a part to be reduced in all the county photovoltaic reverse power based on the photovoltaic reverse power acceptable by the provincial power grid, and reducing the county photovoltaic reverse power according to the sequence of firstly reducing the centralized photovoltaic reverse power and then reducing the distributed photovoltaic reverse power.
8. The distributed photovoltaic digestion system taking into account the differences in operational objectives of different levels as set forth in claim 7, wherein: In the county photovoltaic power dump reduction module, all the county photovoltaic power dump is calculated as follows: and summing the net power of the equivalent source load characteristics of all nodes in the province and county to obtain the photovoltaic reverse power of the province and county, and summing the photovoltaic reverse power of all the province and county governed by each node of the province and county power grid to obtain the photovoltaic reverse power of all the province and county corresponding to the node of the province and county power grid.
9. A terminal comprises a processor and a storage medium, and is characterized in that: The storage medium is used for storing instructions; the processor being operative according to the instructions to perform the steps of the method according to any one of claims 1-6.
10. Computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of the method according to any of claims 1-6.

Description

Distributed photovoltaic digestion method and system considering difference of different-level operation targets Technical Field The invention belongs to the field of energy optimization and scheduling, and particularly relates to a distributed photovoltaic digestion method and system considering different levels of operation target difference. Background With the rapid development of the distributed photovoltaic and the continuous improvement of permeability, the regional power supply structure, the load characteristic, the grid structure, the regulation and control mode and the like are continuously changed, and the problem of the distributed photovoltaic absorption is gradually highlighted. Distributed photovoltaics have caused difficulty in regulating a main network, difficulty in balancing a system is increased, and peak shaving in the midday faces huge pressure. The distributed photovoltaic output is concentrated in the daytime and the peak is basically zero, the large-scale access of the distributed photovoltaic output causes the contradiction between the midday conservation and the peak conservation supply to be increasingly prominent, and the power grid peak shaving in the midday period has larger demands. The existing distributed photovoltaic absorption evaluation method mainly uses the safe operation of the power distribution network as boundary conditions, the restriction of the new energy absorption capacity of the main network is not considered, the calculation result of the method exceeds the actual regulation capacity of the main network, and the super-permeability limit grid connection of the distributed new energy is caused, so that the peak regulation capacity of the main network is insufficient or the power transmission blockage occurs. The Chinese patent application CN116707022A discloses a low-voltage distributed photovoltaic hierarchical regulation method, which comprises the steps of judging whether a feeder line is reversely overloaded by adopting a three-layer regulation mode, when the reverse overload exists, making a regulation plan according to a master station adjustable resource, if an unexecuted power grid regulation plan exists, combining the regulation plan with the power grid regulation plan to make a new regulation plan and issuing the new regulation plan to a platform control layer, wherein the patent scheme only considers low-voltage distributed photovoltaic when considering regulation of the photovoltaic, but does not consider higher voltage level; The China patent application CN119448281A discloses a distributed resource cooperative control method based on layered and partitioned autonomy of a power distribution network, which comprises the steps of providing a layered and partitioned control strategy of an active power grid facing feeder autonomy, establishing a power regulation information model of a power distribution network station area of layered and distributed control, and realizing distributed resource cooperative control based on layered and partitioned autonomy of the power distribution network. However, the patent scheme is only limited to the level of the power distribution network, and the flexible resources of the power distribution network level are cooperatively controlled, so that the photovoltaic digestion problem of larger and higher-voltage-level power grids such as county and provincial power grids is not considered. Therefore, the invention provides a distributed photovoltaic digestion method considering the difference of different levels of operation targets. In addition, the influence of county level pouring on a provincial power grid is considered, and the light rejection rate of the county level is reduced on the basis of considering the provincial power grid digestion capability. Disclosure of Invention In order to solve the defects in the prior art, the invention provides a distributed photovoltaic digestion method and a system which consider the difference of operation targets of different levels, and the method can improve the photovoltaic digestion level of the feeder line area level and has the effect of improving the photovoltaic digestion level of the county level on the basis of considering the digestion capacity of a provincial power grid. The invention adopts the following technical scheme. In a first aspect, the invention discloses a distributed photovoltaic digestion method considering the difference of different levels of operation targets, comprising: Step 1, constructing an operation constraint model of each device in a provincial power grid and a power distribution network; Step 2, constructing a photovoltaic absorption model of the feeder line area based on the operation constraint model of each device, and calculating to obtain equivalent source load characteristics of each area of the feeder line area, wherein the equivalent source load characteristics refer to a power characteristic curve of net power change along with t