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Method and system for measuring harmonic impedance of AC-DC transmission system

A technology of harmonic impedance and power transmission system, which is applied in the field of electric power, can solve problems such as system stability damage and affecting normal operation of the system, and achieve the effect of ensuring normal operation and accurate and effective results

Active Publication Date: 2020-11-20
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

In the power system, the harmonic problems caused by various background harmonics and system disturbances applied to the HVDC transmission system will affect the normal operation of the system, and even cause serious consequences of system stability being destroyed

Method used

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  • Method and system for measuring harmonic impedance of AC-DC transmission system
  • Method and system for measuring harmonic impedance of AC-DC transmission system
  • Method and system for measuring harmonic impedance of AC-DC transmission system

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Embodiment

[0022] refer to figure 1 As shown, the method for measuring harmonic impedance of an AC / DC power transmission system provided in this embodiment includes the following steps:

[0023] S1. Acquisition and acquisition of real-time data in the electric power SCADA (Supervisory Control And Data Acquisition data acquisition and monitoring control system) to calculate the harmonic impedance value under the current operating conditions of the calculation elements required for the AC-DC transmission system; in this step In this method, since the real-time data of power SCADA is used to calculate the harmonic impedance value of each component under the current operating condition, the nonlinear harmonic impedance characteristics and time-varying harmonic impedance characteristics of each component in the actual grid system are considered, and the actual grid system is considered The variability of the operation mode after the system fault takes into account the influence of other prima...

Embodiment 2

[0062] refer to figure 2 As shown, the AC / DC transmission system harmonic impedance measurement system provided in this embodiment includes:

[0063] Data collector 201, is used for collecting and obtaining the real-time data in electric power SCADA; In the present embodiment, this data collector can adopt existing data grabbing tool, such as Silicon Valley data tool GrowingIO, then directly grabs relevant data from electric power SCADA. Real-time data; and after relevant data is captured, the relevant data is transmitted to the first data processor 202;

[0064] The first data processor 202 is used to receive the real-time data transmitted by the data collector to calculate the harmonic impedance value under the current operating condition of the computing elements required by the AC-DC power transmission system; because the first data processor 202 It uses the real-time data of power SCADA to calculate the harmonic impedance value of each component under the current operat...

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Abstract

The invention discloses an AC-DC power transmission system harmonic impedance measurement method and system. The method comprises the steps: S1, collecting and obtaining real-time data in an electricpower SCADA so as to calculate a harmonic impedance value of an element needing to be calculated of an AC-DC power transmission system under a current operation condition; and S2, calculating the harmonic impedance values of different observation nodes in an AC system and a DC power transmission system at different frequencies by adopting a conventional AC system harmonic impedance calculation method according to the harmonic impedance values, calculated in the step S1, of the element needing to be calculated under the current operation condition. According to the method and the system, the harmonic impedance value of each element under the current operation condition is calculated by using the field real-time data, and then the harmonic impedance values of the different observation nodesunder the different frequencies can be obtained by using the conventional alternating current system harmonic impedance calculation method, and a result is accurate and effective so that normal operation of the power transmission system is ensured.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method and system for measuring harmonic impedance of an AC / DC power transmission system. Background technique [0002] The role of harmonic impedance scanning technology in AC and DC transmission systems: [0003] (1) The boundary conditions of the converter station access system of the HVDC transmission project are complex and the operation modes are diverse. Reasonable determination of the harmonic impedance equivalent parameters for the design of the AC filter can realize the reasonable configuration of the AC filter scheme. [0004] (2) The HVDC transmission system is a strongly nonlinear system because it contains a large number of power electronic switches and complex control links. In the power system, the harmonic problems caused by various background harmonics and system disturbances applied to the HVDC transmission system will affect the normal operation of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/02
CPCG01R27/02
Inventor 樊丽娟王海军杨光源
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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