CN-122000900-A - Bridge arm reactor current calculation method and system based on flexible direct current transmission system

CN122000900ACN 122000900 ACN122000900 ACN 122000900ACN-122000900-A

Abstract

The invention discloses a bridge arm reactor current calculation method and a bridge arm reactor current calculation system based on a flexible direct current transmission system, which are applied to the technical field of flexible direct current transmission and comprise the steps of obtaining steady-state parameter data and topological structure parameter data of a target flexible direct current transmission system; obtaining fault condition parameter data of a bridge arm reactor, extracting and processing the fault condition parameter data from topological structure parameter data to obtain equivalent circuit parameter data, processing the equivalent circuit parameter data by utilizing a time domain analysis technology to obtain transient current data, inputting steady-state parameter data and transient current data into a current processing model to process the steady-state parameter data and the transient current data to obtain transient peak current, carrying out simulation processing on the fault condition parameter data of the bridge arm reactor to obtain simulated current, and obtaining peak current based on the transient peak current and the simulated current. The method provided by the invention can solve the technical problem of inaccurate current calculation of the bridge arm reactor, and ensure the steady-state operation of the flexible direct current transmission system.

Inventors

XU YING
WANG LING
ZENG RONG
ZHAO BIAO
ZHAO YUQI
QU LU
HAO ZHIYUAN
GAO ZIJIAN
ZOU TIERUI

Assignees

国网经济技术研究院有限公司
清华大学

Dates

Publication Date: 20260508
Application Date: 20260105

Claims (10)

1. A bridge arm reactor current calculation method based on a flexible direct current transmission system is characterized by comprising the following steps: Acquiring steady-state parameter data and topological structure parameter data of a target flexible direct current transmission system; Extracting from the topological structure parameter data to obtain equivalent circuit parameter data of the target flexible direct current transmission system; Processing the equivalent circuit parameter data by using a time domain analysis technology to obtain transient current data; inputting the steady-state parameter data and the transient current data into a constructed current processing model for processing to obtain transient peak current of the bridge arm reactor; performing simulation processing on the fault condition parameter data of the bridge arm reactor to obtain a simulation current; and obtaining the peak current of the bridge arm reactor based on the transient peak current and the simulation current.
2. The bridge arm reactor current calculation method based on the flexible direct current transmission system of claim 1, wherein the extracting from the topological structure parameter data to obtain the equivalent circuit parameter data of the target flexible direct current transmission system comprises: Extracting the topological structure parameter data to obtain basic circuit element parameters of the target flexible direct current transmission system; and processing the basic circuit element parameters by using an equivalent circuit simplification technology to obtain equivalent circuit parameter data of the target flexible direct current transmission system.
3. The bridge arm reactor current calculation method based on the flexible direct current transmission system of claim 1, wherein the processing the equivalent circuit parameter data by using the time domain analysis technology to obtain transient current data comprises: Processing the equivalent circuit parameter data by using a time domain analysis technology to obtain a transient current component mathematical model; And carrying out current superposition processing on the transient current component mathematical model to obtain the transient current data.
4. The bridge arm reactor current calculation method based on the flexible direct current transmission system of claim 1, wherein the inputting the steady-state parameter data and the transient current data into the constructed current processing model for processing, to obtain the transient peak current of the bridge arm reactor, comprises: performing association screening processing on the steady-state parameter data and the transient current data to obtain a bridge arm current time domain sequence; And inputting the bridge arm current time domain sequence into the current processing model constructed based on a circuit transient response principle for processing to obtain the transient peak current.
5. The bridge arm reactor current calculation method based on the flexible direct current transmission system of claim 1, wherein the performing simulation processing on the fault condition parameter data of the bridge arm reactor to obtain a simulated current comprises: performing simulation processing on the fault condition parameter data of the bridge arm reactor to obtain simulation current waveform data; And processing the simulated current waveform data by utilizing a multi-fault point traversal sampling extraction technology to obtain the simulated current.
6. A bridge arm reactor current calculation system based on a flexible direct current transmission system is characterized by comprising: the system comprises an acquisition module, a fault condition parameter acquisition module and a fault condition parameter acquisition module, wherein the acquisition module is used for acquiring steady-state parameter data and topological structure parameter data of a target flexible direct current transmission system; The extraction module is used for extracting from the topological structure parameter data to obtain equivalent circuit parameter data of the target flexible direct current transmission system; The analysis module is used for processing the equivalent circuit parameter data by utilizing a time domain analysis technology to obtain transient current data; The processing module is used for inputting the steady-state parameter data and the transient current data into a constructed current processing model for processing to obtain the transient peak current of the bridge arm reactor; the simulation module is used for performing simulation processing on the fault condition parameter data of the bridge arm reactor to obtain a simulation current; and the generation module is used for obtaining the peak current of the bridge arm reactor based on the transient peak current and the simulation current.
7. The bridge arm reactor current computing system based on the flexible direct current transmission system of claim 6, wherein the extracting from the topological structure parameter data to obtain the equivalent circuit parameter data of the target flexible direct current transmission system comprises: Extracting the topological structure parameter data to obtain basic circuit element parameters of the target flexible direct current transmission system; and processing the basic circuit element parameters by using an equivalent circuit simplification technology to obtain equivalent circuit parameter data of the target flexible direct current transmission system.
8. The bridge arm reactor current computing system based on the flexible direct current transmission system of claim 6, wherein the processing the equivalent circuit parameter data using the time domain analysis technique to obtain transient current data comprises: Processing the equivalent circuit parameter data by using a time domain analysis technology to obtain a transient current component mathematical model; And carrying out current superposition processing on the transient current component mathematical model to obtain the transient current data.
9. The bridge arm reactor current computing system based on the flexible direct current transmission system of claim 6, wherein the inputting the steady-state parameter data and the transient current data into the constructed current processing model for processing, to obtain the transient peak current of the bridge arm reactor, comprises: performing association screening processing on the steady-state parameter data and the transient current data to obtain a bridge arm current time domain sequence; And inputting the bridge arm current time domain sequence into the current processing model constructed based on a circuit transient response principle for processing to obtain the transient peak current.
10. The bridge arm reactor current computing system based on the flexible direct current transmission system of claim 6, wherein the performing simulation processing on the fault condition parameter data of the bridge arm reactor to obtain a simulated current comprises: performing simulation processing on the fault condition parameter data of the bridge arm reactor to obtain simulation current waveform data; And processing the simulated current waveform data by utilizing a multi-fault point traversal sampling extraction technology to obtain the simulated current.

Description

Bridge arm reactor current calculation method and system based on flexible direct current transmission system Technical Field The invention relates to the technical field of flexible direct current transmission, in particular to a bridge arm reactor current calculation method and system based on a flexible direct current transmission system. Background Flexible direct current transmission (VSC-HVDC) has become a key support technology for new energy grid-connected digestion, island grid power supply and cross-region asynchronous interconnection by virtue of rapid controllability and flexible networking capability. At the moment of direct-current side short-circuit fault, the neutron module capacitor of the flexible direct-current transmission system forms an instantaneous discharge loop through a fault point, so that fault current rises in microsecond level, the bridge arm reactor can limit the current change rate through the inductance characteristic, and equipment is prevented from being damaged due to overshoot. In the prior art, a current sensor based on a Hall effect principle is mostly adopted for directly measuring current, specifically, the sensor is arranged near a bridge arm reactor, an analog voltage signal proportional to instantaneous current is output by sensing a surrounding magnetic field of the sensor, the signal is sampled and quantized through an analog-digital converter, and finally, the signal is converted into digital quantity to be read by a control system, and the digital quantity is used as a direct basis for controlling, modulating and protecting an inner ring of a flexible direct current transmission system. However, the sensitivity of the hall element and the offset of the zero point drift along with the change of the ambient temperature, although the high-end sensor is internally provided with a temperature compensation circuit, the high-end sensor cannot realize complete compensation in a steep temperature change or the whole working temperature area, so that time-varying measurement errors are introduced, current feedback distortion is further caused, the distorted current feedback can directly lead to a controller to generate an error modulation instruction, decoupling control of active power and reactive power is damaged, system oscillation is possibly caused, and even transient instability is caused. Disclosure of Invention The invention provides a bridge arm reactor current calculation method and a bridge arm reactor current calculation system based on a flexible direct current transmission system, which aim to solve the technical problem of inaccurate current calculation of the existing bridge arm reactor and ensure steady-state operation of the flexible direct current transmission system. In order to solve the technical problems, the invention provides a bridge arm reactor current calculation method based on a flexible direct current transmission system, which comprises the following steps: Acquiring steady-state parameter data and topological structure parameter data of a target flexible direct current transmission system; Extracting from the topological structure parameter data to obtain equivalent circuit parameter data of the target flexible direct current transmission system; Processing the equivalent circuit parameter data by using a time domain analysis technology to obtain transient current data; inputting the steady-state parameter data and the transient current data into a constructed current processing model for processing to obtain transient peak current of the bridge arm reactor; performing simulation processing on the fault condition parameter data of the bridge arm reactor to obtain a simulation current; and obtaining the peak current of the bridge arm reactor based on the transient peak current and the simulation current. As one preferable solution, the extracting from the topological structure parameter data to obtain the equivalent circuit parameter data of the target flexible direct current transmission system includes: Extracting the topological structure parameter data to obtain basic circuit element parameters of the target flexible direct current transmission system; and processing the basic circuit element parameters by using an equivalent circuit simplification technology to obtain equivalent circuit parameter data of the target flexible direct current transmission system. As one preferable solution, the processing the equivalent circuit parameter data by using a time domain analysis technology to obtain transient current data includes: Processing the equivalent circuit parameter data by using a time domain analysis technology to obtain a transient current component mathematical model; And carrying out current superposition processing on the transient current component mathematical model to obtain the transient current data. As one preferable scheme, the inputting the steady-state parameter data and the transient current data into the constructed