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Real time digital system (RTDS) phase-locking synchronous element

A synchronous component and phase-locked technology, which is applied to the phase angle between voltage and current, measuring devices, instruments, etc., can solve the problems that cannot achieve high-voltage direct current transmission performance and accuracy, and achieve the effect of ensuring accuracy

Inactive Publication Date: 2012-07-18
XUCHANG KETOP DETECTION TECH CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, the current phase-locked synchronization methods that can be used in RTDS cannot achieve the performance and accuracy required for HVDC transmission.

Method used

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  • Real time digital system (RTDS) phase-locking synchronous element
  • Real time digital system (RTDS) phase-locking synchronous element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] Such as figure 1 As shown, this embodiment mainly consists of the following parts:

[0018] a) The anti-aliasing filter module adopts Butterworth low-pass filter 1;

[0019] The typical working step size of RTDS is 50us, and according to the sampling theorem, it can represent signals up to 10000Hz; figure 1 As shown in the dotted box of , the working sampling interval of most components is 625us, which can only represent signals below 800Hz. In order to prevent frequency aliasing during resampling, an anti-aliasing filter must be set to filter out the high-frequency part of the RTDS original signal. In this embodiment, a fifth-order Butterworth low-pass filter is used, and the cut-off frequency is set to 400 Hz.

[0020] b) The resampling module adopts the linear interpolation sampling module 2;

[0021] Because the working step of the RTDS is not an integer multiple of the sampling interval in this embodiment, in order to improve the calculation accuracy as much as ...

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PUM

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Abstract

The invention relates to an RTDS phase-locking synchronous element comprising an anti-aliasing filtering module, a resampling module, a digital filtering module for filtering positive sequences and harmonic waves and an amplitude and phase calculating module of alternating current voltage which are sequentially connected, wherein the input of the anti-aliasing filtering module is three-phase voltage, the outputs of the amplitude and phase calculating module of the alternative current voltage are the amplitude and the phase of synchronous voltage, the amplitude and phase outputs of the synchronous voltage are connected to the control end of the resampling module through an alternating-current voltage frequency tracking module, and the phase output of the synchronous voltage outputs the output phase of a phase-locking ring through a phase error control and a phase integration module. The invention satisfies the requirements of high-voltage direct-current transmission for the synchronization performance and precision of trigger pulses.

Description

technical field [0001] The invention relates to an RTDS phase-locked synchronous element, in particular to an RTDS phase-locked synchronous element used for direct current transmission. Background technique [0002] In the field of HVDC transmission, RTDS is currently the best closed-loop test tool, which can be connected to external control and protection equipment for testing. When there is no external control and protection equipment, RTDS itself can also build a control and protection model for simulation, which is of great significance to the system research of DC transmission. [0003] The phase-locked synchronous element is the most important basic component of DC transmission, and its output is directly used for the generation and distribution of trigger pulses. However, the current phase-locked synchronization methods that can be used in RTDS cannot achieve the performance and accuracy required for HVDC transmission. In order to more accurately simulate the contro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01G01R25/00
CPCY02E40/40
Inventor 姚致清周鹏鹏傅润炜庄良文李树森李亚萍王伟
Owner XUCHANG KETOP DETECTION TECH CO LTD
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