Frequency and amplitude adaptive algorithm for transient electrical signal

An adaptive algorithm and electrical signal technology, applied in frequency measurement devices, complex mathematical operations, AC/pulse peak measurement, etc., can solve problems such as inability to achieve effective tracking and reduced calculation accuracy, and achieve fast and accurate synchronous adaptive tracking, The effect of high algorithm accuracy and effective technical support

Active Publication Date: 2019-05-03
LIUAN POWER SUPPLY COMPANY STATE GRID ANHUI ELECTRIC POWER +1
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Problems solved by technology

However, the above algorithms are all based on the standard sinusoidal signal with constant amplitude. When the amplitude changes greatly, the calculation accuracy will be significantly reduced, and it is impossible to achieve effective tracking in the case of synchronous time-varying frequency and amplitude.

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  • Frequency and amplitude adaptive algorithm for transient electrical signal
  • Frequency and amplitude adaptive algorithm for transient electrical signal
  • Frequency and amplitude adaptive algorithm for transient electrical signal

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Embodiment Construction

[0054] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0055] see figure 1 , the embodiment of the present invention includes:

[0056] A frequency and amplitude adaptive algorithm for transient electrical signals, comprising the following steps:

[0057] S1: Before the AD sampling module, the power system signal x(t) is equipped with an anti-aliasing analog filter to minimize the spectrum leakage of the sampling signal, and the sampling frequency is f s (Unit: Hz), the sampling time is t s (Unit: s) Sampling the power system signal x(t) (unit: V or A) to obtain N-point discrete electrical signal x(n), where N=f s *t s , the sampling interval is T s =1 / f s ;

[0058] S2: Establish a cubic spli...

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Abstract

The invention discloses a frequency and amplitude adaptive algorithm for a transient electrical signal. The algorithm includes the following steps: performing cubic spline interpolation on an electrical signal of a sample at a time domain; performing data truncation according to sampling intervals after obtaining an interpolation sequence; constructing reconstructed samples; and estimating the frequency and amplitude of each reconstructed sample by adopting a Prony algorithm. Through the verification of experimental results, the algorithm can rapidly and accurately realize the synchronous adaptive tracking of the frequency and amplitude of a power grid; and the algorithm is suitable for the synchronous detection of electrical parameters under the circumstances that the frequency and amplitude of a power grid signal are simultaneously changed with time, so that the algorithm is high in accuracy and can provide reliable and effective technical support for the accurate measuring and analysis of the three elements of the power grid.

Description

technical field [0001] The invention relates to the field of time-varying electrical signal analysis in power systems, in particular to a frequency and amplitude self-adaptive algorithm for transient electrical signals. Background technique [0002] The frequency and amplitude of the power system are important parameters to measure the power quality. They are not only the feedback to realize the stability control of the power system, but also serve as the benchmark for the accurate operation of the relay protection device. Therefore, the frequency and amplitude of the power grid are accurately measured. important for analysis. [0003] With the introduction of the smart grid concept, the access of large-scale distributed power sources and nonlinear loads causes the grid voltage and current frequency amplitudes to exhibit time-varying characteristics, which are unsteady time-varying power signals. [0004] Judging from the papers published at home and abroad, there have been...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/04G01R23/02G06F17/18G06F17/16
Inventor 陈浩费传鹤王平孙晋杰王恒招张怀军万阳王连龙王恒杰
Owner LIUAN POWER SUPPLY COMPANY STATE GRID ANHUI ELECTRIC POWER
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