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Wide-zone electric-net phasor synchronous measuring device with freely-set synchronous time scale

A technology for synchronizing time scales and wide-area power grids. It is applied to measuring devices, measuring electrical variables, and measuring current/voltage. It can solve the problems of waste of sampling data, unavailability of sampling data in data windows, and excess sampling data, and achieve a simple structure. Effect

Active Publication Date: 2009-04-08
ZHEJIANG UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. When performing wide-area synchronous measurement, the synchronous sampling time can only be fixed at the first point mark, which limits the flexibility of the synchronous sampling time mark;
[0008] 2. The width of the sampling data window is fixed (for example, 20ms, in order to ensure the time synchronization of wide-area power grid phasor measurement), and it cannot be adjusted automatically following the change of the frequency of the measured signal, so each data window has excess sampling data (when the measured signal frequency is higher than 50Hz) or insufficient (when the measured signal frequency is lower than 50Hz)
When there is an excess, several sampling data at the end of the data window are wasted, and when it is insufficient, the sampling data of the entire data window is unavailable

Method used

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  • Wide-zone electric-net phasor synchronous measuring device with freely-set synchronous time scale
  • Wide-zone electric-net phasor synchronous measuring device with freely-set synchronous time scale
  • Wide-zone electric-net phasor synchronous measuring device with freely-set synchronous time scale

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Embodiment Construction

[0030] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0031] refer to figure 1 , the synchronous time scale of the present invention can freely set the wide-area power network phasor synchronous measuring device, is made up of three major modules of self-adaptive equidistant sampling module 1, synchronous time scale forming module 2 and microprocessor module 3,

[0032] Adaptive equally spaced sampling module 1 includes:

[0033] - Signal preprocessing circuit 1.0, for the three-phase AC analog signal v from the field a , vb , v c i a i b i c Perform isolation, amplification and anti-aliasing preprocessing, and output the corresponding analog signal V a , V b , V c , I a , I b , I c ;

[0034] - signal superimposition circuit 1.1, its input terminal is connected with the output terminal of signal preprocessing circuit 1.0, for the input three-phase AC analog signal V a , V b , V c Superimposed, the output...

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Abstract

The invention discloses Wide Area Network synchronized phasor measurement device with time free set, which is made of adaptive interval sampling module, synchronous time modules and microprocessor module. The structure is simple, can achieve the difficult decoupling treatment of 'time synchronization' and 'Frequency Synchronization' in phasor synchronous device. Synchronization set time scales flexibly can be reached, sampling data window can adjusts to the signal frequency adaptive changes (that is, each interval sampling data in the window is equivalent to the demand), so as to ensure continuous precision operation phasor synchronization measurement of wide area network.

Description

technical field [0001] The invention relates to a synchronous measuring device for a phasor parameter of a wide-area power grid operating in different places, in particular to a wide-area power grid phasor synchronous measuring device whose synchronous time scale can be set freely. Background technique [0002] The wide area measurement system WAMS (Wide Area Measurement System) can monitor the operation phasor of the whole network of the power system synchronously in different places, and the obtained phasor data with time scale information of synchronous measurement can be used to analyze the operation status of the whole network and calculate the power flow , state estimation, transient stability prediction and control, fault analysis and emergency safety control, etc., in order to facilitate the safe and stable operation of the wide area power grid. The wide-area power grid phasor synchronous measurement device is the basis of WAMS. The accuracy of the phasor synchroniza...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/25G01R19/255
CPCY02E60/728Y04S10/265Y02E40/70Y02E60/00Y04S10/00Y04S10/22
Inventor 江道灼
Owner ZHEJIANG UNIV
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