CN-114759591-B - Network loss allocation method and device for AC/DC power transmission system and computer equipment

CN114759591BCN 114759591 BCN114759591 BCN 114759591BCN-114759591-B

Abstract

The application relates to a network loss allocation method, a network loss allocation device and computer equipment of an alternating current/direct current transmission system. The method comprises the steps of obtaining alternating current node parameters of pure alternating current nodes, first direct current node parameters and second direct current node parameters of direct current nodes, obtaining third direct current node parameters of the direct current nodes according to the first direct current node parameters and the second direct current node parameters, inputting the alternating current node parameters, the first direct current node parameters and the third direct current node parameters into a marginal network loss coefficient model to obtain alternating current network loss allocation amounts of a plurality of power grid nodes, obtaining direct current network loss allocation amounts of the plurality of power grid nodes, and obtaining total network loss allocation amounts of the plurality of power grid nodes according to the alternating current network loss allocation amounts and the direct current network loss allocation amounts. By adopting the method, the total network loss allocation quantity can be obtained through the marginal network loss coefficient model, so that the reliability of network loss allocation can be improved.

Inventors

WANG QI
ZHENG WENJIAN
LAI GUANGLIN
Huang Shanchao
HE XINYU
HE SEN
CHANG AN
ZHOU ZHENZHEN
YANG JUN
SUN MENG
SONG YUNHAI
SHANG JIANING
XIAO YAOHUI

Assignees

中国南方电网有限责任公司超高压输电公司检修试验中心

Dates

Publication Date: 20260505
Application Date: 20220518

Claims (9)

1. A network loss allocation method of an alternating current/direct current transmission system is characterized in that the alternating current/direct current transmission system comprises a plurality of power grid nodes, wherein the plurality of power grid nodes comprise pure alternating current nodes and direct current nodes, and the method comprises the following steps: acquiring alternating current node parameters of the pure alternating current node, and first direct current node parameters and second direct current node parameters of the direct current node; Obtaining a third direct current node parameter of the direct current node according to the first direct current node parameter and the second direct current node parameter, wherein the third direct current node parameter is the partial derivative of reactive power of the direct current node to voltage amplitude; Inputting the alternating current node parameter, the first direct current node parameter and the third direct current node parameter into a marginal network loss coefficient model to obtain the alternating current network loss allocation quantity of the plurality of power grid nodes, wherein before inputting the alternating current node parameter, the first direct current node parameter and the third direct current node parameter into the marginal network loss coefficient model, the marginal network loss coefficient model is obtained by the following way that for each pure alternating current node, the active power of the pure alternating current node is led to calculate the bias derivative of the voltage amplitude and the phase angle of any power grid node, and the reactive power of the pure alternating current node is led to calculate the bias derivative of the voltage amplitude and the phase angle of any power grid node; obtaining direct current network loss allocation amounts of the plurality of power grid nodes; And obtaining the total network loss allocation quantity of the plurality of power grid nodes according to the alternating current network loss allocation quantity and the direct current network loss allocation quantity.
2. The method of claim 1, wherein inputting the ac node parameter, the first dc node parameter, and the third dc node parameter into a marginal loss coefficient model, to obtain an ac loss split of the plurality of grid nodes, comprises: Inputting the alternating current node parameters, the first direct current node parameters and the third direct current node parameters into a marginal network loss coefficient model to obtain the active power marginal coefficients of the power grid nodes; And obtaining the traffic flow network loss allocation amount according to the active power marginal coefficient and the active power of the corresponding power grid node.
3. The method according to claim 1 or 2, wherein after the ac node parameter, the first dc node parameter, and the third dc node parameter are input into a marginal loss coefficient model, obtaining an ac loss amortization amount of the plurality of grid nodes, further includes: obtaining a correction coefficient, and correcting the traffic flow network loss allocation according to the correction coefficient to obtain corrected traffic flow network loss allocation; and obtaining the total network loss allocation quantity of the plurality of power grid nodes according to the corrected alternating current network loss allocation quantity and the direct current network loss allocation quantity.
4. A method according to claim 3, wherein said obtaining correction factors comprises: and obtaining the correction coefficient according to the actual total network loss of the alternating current network in the alternating current-direct current power transmission system, the shared quantity of the alternating current network loss and the number of the power grid nodes.
5. The method of claim 1, wherein the ac node parameter comprises a first ac voltage magnitude and an ac node phase angle difference, and wherein the first dc node parameter comprises a second ac voltage magnitude and an ac-dc node phase angle difference; The obtaining the ac node parameter of the pure ac node and the first dc node parameter of the dc node includes: for each pure alternating current node, acquiring active power and reactive power of the pure alternating current node, and acquiring real part parameters and imaginary part parameters of branch admittances between the pure alternating current node and any grid node; And obtaining the first alternating current voltage amplitude, the alternating current node phase angle difference, the second alternating current voltage amplitude and the alternating current/direct current node phase angle difference according to the active power of the pure alternating current node, the reactive power of the pure alternating current node, the real part parameter of the branch admittance and the imaginary part parameter of the branch admittance.
6. The method of claim 1, wherein the obtaining the dc loss apportionment of the plurality of grid nodes comprises: preprocessing a direct current line of the alternating current-direct current transmission system to obtain a lossless line; obtaining the power share of each power grid node according to the lossless line; And obtaining direct current network loss allocation amounts of a plurality of power grid nodes according to the power shares.
7. A network loss allocation device of an AC/DC power transmission system is characterized in that the AC/DC power transmission system comprises a plurality of power grid nodes, wherein the plurality of power grid nodes comprise pure AC nodes and DC nodes, and the device comprises: The node parameter acquisition module is used for acquiring the alternating current node parameters of the pure alternating current node, and the first direct current node parameters and the second direct current node parameters of the direct current node; The direct current reactive power module is used for obtaining a third direct current node parameter of the direct current node according to the first direct current node parameter and the second direct current node parameter, wherein the third direct current node parameter is the partial derivative of reactive power of the direct current node to voltage amplitude; The marginal network loss coefficient module is used for inputting the alternating current node parameters, the first direct current node parameters and the third direct current node parameters into a marginal network loss coefficient model to obtain the alternating current network loss allocation quantity of the plurality of power grid nodes, wherein the marginal network loss coefficient model is obtained before inputting the alternating current node parameters, the first direct current node parameters and the third direct current node parameters into the marginal network loss coefficient model by the following way that for each pure alternating current node, the active power of the pure alternating current node is subjected to deviation conduction on the voltage amplitude and the phase angle of any power grid node, and the reactive power of the pure alternating current node is subjected to deviation conduction on the voltage amplitude and the phase angle of any power grid node; the direct current network loss acquisition module is used for acquiring direct current network loss allocation quantities of the plurality of power grid nodes; And the total network loss allocation module is used for obtaining the total network loss allocation of the plurality of power grid nodes according to the alternating current network loss allocation and the direct current network loss allocation.
8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 6 when the computer program is executed.
9. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.

Description

Network loss allocation method and device for AC/DC power transmission system and computer equipment Technical Field The application relates to the technical field of power systems, in particular to a network loss allocation method, a network loss allocation device and computer equipment of an alternating current/direct current power transmission system. Background The network loss is the power loss emitted in the form of heat energy in the electric energy transmission process, is the unavoidable electric energy loss in the electric power transaction, and is not negligible in the operation control management of the electric power system. In the power system, how to distribute the network loss to each power grid node fairly, equitably, accurately and reasonably is one of the key problems related to the healthy development of the power market, is also an important content of power transmission pricing in the power market, and is a basic requirement of fair competition of the power market. At present, the research on a network loss allocation method of an alternating current/direct current transmission system mainly comprises a stamp method and a power flow tracking method, wherein the power flow tracking method is mainly used for calculating the use degree of each node on the network loss of a specific line based on a proportion sharing principle according to the actual power flow of each line in the system, so as to allocate the network loss. However, the current tide tracking method is used for allocating network losses of an alternating current/direct current transmission system, and lacks reliability. Disclosure of Invention In view of the foregoing, it is desirable to provide a method, an apparatus, and a computer device for allocating network loss in an ac/dc power transmission system, which can improve the reliability of allocating network loss in the ac/dc power transmission system. In a first aspect, the application provides a network loss allocation method of an ac/dc power transmission system. The AC/DC power transmission system comprises a plurality of power grid nodes, wherein the power grid nodes comprise pure AC nodes and DC nodes, and the method comprises the following steps: Acquiring alternating current node parameters of a pure alternating current node, and a first direct current node parameter and a second direct current node parameter of a direct current node; obtaining a third direct current node parameter of the direct current node according to the first direct current node parameter and the second direct current node parameter, wherein the third direct current node parameter is the partial derivative of reactive power of the direct current node on the voltage amplitude; Inputting the alternating current node parameters, the first direct current node parameters and the third direct current node parameters into a marginal network loss coefficient model to obtain alternating current network loss allocation amounts of a plurality of power grid nodes; obtaining direct current network loss allocation amounts of a plurality of power grid nodes; and obtaining the total network loss allocation quantity of the plurality of power grid nodes according to the alternating current network loss allocation quantity and the direct current network loss allocation quantity. In one embodiment, inputting the ac node parameter, the first dc node parameter, and the third dc node parameter into the marginal loss coefficient model to obtain ac loss allocation amounts of the plurality of grid nodes, including: Inputting the alternating current node parameters, the first direct current node parameters and the third direct current node parameters into a marginal network loss coefficient model to obtain the active power marginal coefficients of all the power grid nodes; And obtaining the traffic flow network loss allocation amount according to the active power marginal coefficient and the active power of the corresponding power grid node. In one embodiment, before the ac node parameter, the first dc node parameter, and the third dc node parameter are input into the marginal loss coefficient model, the marginal loss coefficient model is obtained by: For each pure alternating current node, the active power of the pure alternating current node is led to calculate the deviation of the voltage amplitude and the phase angle of any grid node, and the reactive power of the pure alternating current node is led to calculate the deviation of the voltage amplitude and the phase angle of any grid node. In one embodiment, after the ac node parameter, the first dc node parameter, and the third dc node parameter are input into the marginal loss coefficient model, obtaining the ac loss allocation amounts of the plurality of grid nodes, the method further includes: and obtaining a correction coefficient, and correcting the traffic network loss allocation according to the correction coefficient to obtain the corrected traffic network