System frequency measurement method and synchronous phasor measurement method and device

A technology of synchronized phasor measurement and system frequency, which is applied in the direction of frequency measurement device, electric variable measurement, measurement device, etc. It can solve the problems that synchronized phasors do not have comparability and interoperability, and achieve the effect of improving accuracy

Active Publication Date: 2014-02-12
SCHNEIDER ELECTRIC IND SAS
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Problems solved by technology

However, since this standard is only applicable to steady-state measurements, it cannot meet the needs of more dynamic measurements such as power fluctuations, phase angle changes, frequency changes, and even faults. The synchrophasors measured by different products are not comparable and Interoperability

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  • System frequency measurement method and synchronous phasor measurement method and device
  • System frequency measurement method and synchronous phasor measurement method and device
  • System frequency measurement method and synchronous phasor measurement method and device

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Embodiment Construction

[0032] The synchronized phasor measurement method and device according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0033] First, refer to figure 1 A synchronized phasor measurement method 100 according to an embodiment of the present invention will be described.

[0034] The synchronized phasor measurement method 100 according to the embodiment of the present invention is initialized in step S105.

[0035] In step S110, voltage and current signals of the power system are sampled based on an absolute time reference. As known in the art, A / D sampling is performed on the voltage signal and current signal of the power system in a synchronous sampling system, so as to obtain the original sampled voltage signal and current signal. Usually, the trigger sampling pulse used in the synchronous sampling system is locked to an absolute time reference, for example, the absolute time reference may be the 1PPS signal of G...

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Abstract

The invention relates to a system frequency measurement method and a synchronous phasor measurement method and device. The synchronous phasor measurement method includes the steps of sampling a voltage signal and a current signal of an electric power system on the basis of absolute time reference, filtering out out-of-band interference from the sampled voltage signal and the sampled current signal, conducting resampling for the first time on at least one of the voltage signal without out-of-band interference and the current signal without out-of-band interference based on an estimated system frequency, calculates the phasor of the signal undergoing the resampling for the first time, updating the estimated system frequency, conducting resampling on the voltage signal withour out-of-band interference and the current signal withour out-of-band interference for the second time for the report moment and on the basis of the updated estimated system frequency, and calculating the synchronous phasor of the voltage signal undergoing resampling for the second time and the current signal undergoing resampling for the second time. The system frequency measurement method and the synchronous phasor measurement method and device are not only suitable for steady-state operation of the electric power system but also suitable for dynamic running of the electric power system. A high-precision measurement result is further provided.

Description

technical field [0001] The invention relates to the field of automatic measurement of power systems, and more particularly relates to a high-precision system frequency measurement method, a synchronized phasor measurement method and equipment. Background technique [0002] Synchronized phasor measurement units (PMUs) have become important measurement components in power systems, which can provide high-precision voltage and current phasors and frequencies synchronized with absolute time. PMU can be applied to many aspects such as dynamic monitoring, operation, and control of real-time power systems. [0003] Traditionally, power systems have been monitored by integrating asynchronous measurements, for example, feeding generator / load power and voltage magnitudes into a software model, and then calculating each condition for specific load and generator real-time power and voltage conditions. Voltage angle and magnitude information of the bus. However, these quantities can now...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/02G01R25/00
CPCY02E60/728Y04S10/265H02J13/00G01R19/2513Y02E40/70Y02E60/00Y04S10/00Y04S10/22
Inventor 罗姗姗
Owner SCHNEIDER ELECTRIC IND SAS
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