CN-122000990-A - Method, equipment and medium for determining power system configuration scheme

CN122000990ACN 122000990 ACN122000990 ACN 122000990ACN-122000990-A

Abstract

The embodiment of the invention provides a method, equipment and medium for determining a power system configuration scheme. The method comprises the steps of determining initial inertia of a system, calculating reactive response capacity of each new energy node and determining a first node if the initial inertia of the system is smaller than an inertia requirement value, taking the new energy node with a short circuit ratio smaller than a short circuit ratio threshold value as a second node after simulating network construction reconstruction of the first node if the first node is different from a previous configuration scheme, determining a current configuration scheme and corresponding configuration cost, re-determining initial inertia of the system after simulating synchronous camera configuration of the second node, and returning to execute the step of judging whether the initial inertia of the system is larger than or equal to the inertia requirement value, wherein the scheme with the lowest configuration cost is selected if the first node is identical to the previous configuration scheme. The scheme can determine various configuration schemes of the new energy power system, and the scheme with the lowest cost is selected as the target configuration scheme, so that the economy of system transformation is ensured.

Inventors

WANG YUXUAN
ZHAO FENG
CHENG XIAOBIN
HAO NING
DAN TANGJUN
JIANG JUN
FANG CHAO

Assignees

上海发电设备成套设计研究院有限责任公司

Dates

Publication Date: 20260508
Application Date: 20260210

Claims (10)

1. A method for determining a configuration of an electrical power system, wherein the electrical power system includes at least a plurality of new energy nodes, the method comprising: Determining initial inertia of a system, and judging whether the initial inertia of the system is larger than or equal to an inertia requirement value; If the initial inertia of the system is smaller than the inertia requirement value, the reactive response capacity of each new energy node is calculated respectively, and a first node is determined according to the reactive response capacity; If the first node is different from the first node in the previous configuration scheme, after the first node is simulated to be subjected to network construction type reconstruction, respectively calculating the short circuit ratio of each new energy node, and taking the new energy node with the short circuit ratio smaller than a short circuit ratio threshold value as a second node; determining a current configuration scheme and corresponding configuration cost thereof, wherein the current configuration scheme is used for indicating that the first node is subjected to network construction type reconstruction and the second node is subjected to synchronous camera adjustment configuration; After simulating to carry out synchronous camera setting configuration on the second node, re-determining the initial inertia of the system, and returning to execute the step of judging whether the initial inertia of the system is larger than or equal to an inertia requirement value until the first node is the same as the first node in the previous configuration scheme; And if the first node is the same as the first node in the last configuration scheme, selecting the scheme with the lowest configuration cost from all the currently determined configuration schemes as a target configuration scheme.
2. The method according to claim 1, wherein the method further comprises: if the initial inertia of the system is larger than or equal to the inertia requirement value, respectively calculating the short-circuit ratio of each new energy node; for the case that the short circuit ratio of all new energy nodes is greater than or equal to the short circuit ratio threshold value, keeping the configuration scheme of the power system unchanged; And regarding the condition that the short circuit ratio of at least one new energy node is smaller than a short circuit ratio threshold value, taking the new energy node with the short circuit ratio smaller than the short circuit ratio threshold value as a second node, and determining a target configuration scheme, wherein the target configuration scheme is used for indicating the synchronous camera configuration of the second node.
3. The method of claim 1, wherein said determining a first node from said reactive response capability comprises: Sequencing the new energy nodes according to the sequence from strong reactive response to weak reactive response, and respectively calculating the inertia difference values before and after the network construction transformation of the xth new energy node to the last new energy node; and sequentially selecting at least one new energy node from the x-th to the last new energy nodes as a first node according to the initial inertia of the system, the inertia requirement value and the inertia difference value, wherein the sum of the inertia difference values corresponding to the first node is larger than or equal to the difference between the inertia requirement value and the initial inertia of the system, and the number of the first nodes is minimum.
4. The method according to claim 1 or 2, characterized in that after taking a new energy node with a short-circuit ratio smaller than a short-circuit ratio threshold as a second node, the method further comprises: Determining a short circuit ratio difference value according to a short circuit ratio threshold value and a short circuit ratio corresponding to the second node; and calculating the configuration capacity of the synchronous camera of the second node according to the short circuit ratio difference value.
5. The method of claim 1, wherein the determining the initial inertia of the system comprises: Determining the sum of the capacities of all grid-connected nodes in the power system, wherein the grid-connected nodes comprise the new energy nodes or the grid-connected nodes comprise the new energy nodes and non-new energy nodes; And determining the initial inertia of the system according to the sum of the capacities of all grid-connected nodes, the capacity of the synchronous units in the power system and the inertia coefficient of the synchronous units.
6. The method of claim 1, wherein the reactive response capability of the ith new energy node ; Where j represents an index of load nodes in the power system, m represents a total number of load nodes in the power system, Representing the active power of the load node j, Representing the sum of the active power of all load nodes, Representing the active power output of the ith new energy node, Representing the sum of the active power output of all new energy nodes, Representing the reactive power output of the ith new energy node, Representing the reactive power of the load node j, Representation of For a pair of Is used for the partial derivative of (a), Representation of For a pair of Is a partial derivative of (c).
7. The method of claim 1, wherein for any new energy node, the calculating the short ratio of the new energy node comprises: Respectively determining the short-circuit capacity, apparent power and equivalent apparent power of other grid-connected nodes of the new energy node; and calculating the short circuit ratio of the new energy node according to the short circuit capacity, the apparent power and the equivalent apparent power of other grid-connected nodes of the new energy node.
8. The method of claim 7, wherein the short circuit capacity of the ith new energy node Wherein, the method comprises the steps of, Represents the nominal voltage of the bus bar of the ith new energy node, Representing the actual operating voltage of the ith new energy node, Representing the self-impedance of the ith new energy node; equivalent apparent power of other new energy nodes Wherein l represents the index of other grid-connected nodes, n represents the total number of other grid-connected nodes, Represents the apparent power of the other grid-connected nodes i, Representing the actual operating voltage of the other grid-tie node l, Representing the transimpedance between the new energy node i and the grid-connected node l; Short-circuit ratio of ith new energy node Wherein, the method comprises the steps of, And represents the apparent power of the ith new energy node.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of determining the power system configuration scheme of any one of claims 1 to 8 when the program is executed by the processor.
10. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when executed by a processor, implements a method of determining a power system configuration scheme according to any one of claims 1 to 8.

Description

Method, equipment and medium for determining power system configuration scheme Technical Field The embodiment of the invention relates to the technical field of new energy power systems, in particular to a method, equipment and medium for determining a power system configuration scheme. Background The development of new energy power systems is a key measure for pushing low-carbon transformation of power systems. However, the new energy power system is limited by remote geographical location, lacks an on-site synchronization unit, and usually has the characteristics of low inertia and low short circuit ratio, so that the frequency stability is poor, and the recovery after the voltage instability is difficult. The novel energy node in the novel energy power system is subjected to network construction type transformation to provide inertia support, so that the novel energy node can be quickly recovered after voltage instability, and the novel energy node is provided with a synchronous camera to provide short-circuit capacity so as to improve the short-circuit ratio of the novel energy node, inhibit voltage fluctuation and improve the overcurrent tolerance of the node. However, the existing new energy power system configuration scheme has the problems that dual requirements of inertia and voltage support are difficult to meet, or the configuration is redundant, and the configuration scheme is poor in economy. Disclosure of Invention The embodiment of the invention provides a method, equipment and medium for determining a power system configuration scheme, which can determine various configuration schemes of a new energy power system, select the scheme with the lowest cost as a target configuration scheme and ensure the economy of system reconstruction. In a first aspect, a method for determining a power system configuration scheme provided by an embodiment of the present invention includes: The method comprises the steps of determining initial inertia of a system, judging whether the initial inertia of the system is larger than or equal to an inertia requirement value, respectively calculating reactive response capacity of each new energy node and determining a first node according to the reactive response capacity if the initial inertia of the system is smaller than the inertia requirement value, respectively calculating a short circuit ratio of each new energy node after simulating networking reconstruction of the first node if the first node is different from the first node in a previous configuration scheme, taking the new energy node with the short circuit ratio smaller than a short circuit ratio threshold value as a second node, determining a current configuration scheme and corresponding configuration cost thereof, wherein the current configuration scheme is used for indicating the networking reconstruction of the first node and synchronous camera configuration of the second node, re-determining the initial inertia of the system after simulating synchronous camera configuration of the second node, and returning to execute the step of judging whether the initial inertia of the system is larger than or equal to the inertia requirement value until the first node is the same as the first node in the previous configuration scheme, and selecting all the lowest configuration schemes from the current configuration schemes as target configuration schemes if the first node is the same as the first node in the previous configuration scheme. In a second aspect, a determining device for a power system configuration scheme provided by an embodiment of the present invention includes: The system comprises a first configuration scheme, a second configuration scheme, a third determination module, a cost determination module and a target determination module, wherein the first determination module is used for determining initial inertia of a system and judging whether the initial inertia of the system is larger than or equal to an inertia requirement value, the first determination module is used for respectively calculating reactive response capacity of each new energy node and determining the first node according to the reactive response capacity if the initial inertia of the system is smaller than the inertia requirement value, the second determination module is used for respectively calculating a short circuit ratio of each new energy node after the first node is simulated to carry out network formation transformation, and taking the new energy node with the short circuit ratio smaller than a short circuit ratio threshold value as the second node, the cost determination module is used for determining a current configuration scheme and corresponding configuration cost thereof, the current configuration scheme is used for indicating the network formation transformation of the first node and carrying out synchronous camera configuration of the second node, the third determination module is used for redetermining the initia