Active current extraction method based on orthogonal sine wave integral modulation

A technology of active current and quadrature sine, which is applied in the field of active current extraction, can solve the problems of high calculation cost, complex process, and difficult accurate detection of voltage, and achieve the advantages of small calculation amount, simple process, avoiding phase shift and response delay Effect

Active Publication Date: 2011-05-18
STATE GRID HUBEI ELECTRIC POWER RES INST +1
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Problems solved by technology

The result of this is that the computational overhead is greatly increased, which limits the application of real-time detection
[0013] 2) It is difficult to accurately detect when the voltage contains harmonics
There is no perfect solution to this instantaneous reactive power
[0015] 3) Circuit detection is too complicated
[0016] The detection of instantaneous reactive single-phase circuit must construct three-phase voltage and current from a single phase, then use the theory of instantaneous reactive power to dete

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  • Active current extraction method based on orthogonal sine wave integral modulation
  • Active current extraction method based on orthogonal sine wave integral modulation
  • Active current extraction method based on orthogonal sine wave integral modulation

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Embodiment Construction

[0078] The present invention will be further described below in conjunction with the drawings and embodiments. In the method for extracting active current, the total current i and voltage u signals of the load are input, and the method includes the following steps:

[0079] (1) Generate standard sine wave reference current:

[0080] Separately generate two mutually orthogonal sinusoidal current waveforms i 1 And i 2 , The two sine waveforms require the same amplitude, the same power frequency, and the phase difference is 90 degrees;

[0081] (2) Perform total power integral modulation:

[0082] Taking load current i and voltage u as inputs, these two electrical quantities are integrated in the cycle window power to obtain the active power P;

[0083] (3) Obtain the modulation power term:

[0084] The reference current i 1 , I 2 And load voltage u as input, load voltage u and reference current i 1 , I 2 Perform cycle window power integration to get the modulated power term P 1 And P 2 ; ...

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Abstract

The invention relates to an active current extraction method based on orthogonal sine wave integral modulation. The method comprises the following steps: 1) a standard sine wave reference current is generated; 2) the integral modulation of the total power is performed; 3) the modulation power is obtained; and 4) the method for obtaining the active current can be realized by a computer or a hardware circuit and is as follows: the extraction method of active current signal or data is adopted, and the signals of the total current i and voltage u which are input in a load are utilized to obtain the active current signals ip through an algorithm below. The idle current and generalized idle current detected by the method of the invention do not contains any active component, the method does not contain filtering link; when the voltage is non-sine wave, phase-lock loop is not required and single-phase detection is performed directly and not influenced by the imbalance of the three phases in a circuit; and the detection result is not influenced by voltage harmonic and destortion, and the method is suitable for the real-time detection of current.

Description

Technical field [0001] The invention relates to dynamic reactive power compensation of electric power systems, in particular to an active current extraction method. Background technique [0002] Reactive power and harmonic compensation of power system is one of the hot fields that power system has paid close attention to for a long time. With the development of modern power electronic technology, a new type of dynamic reactive power compensation device has appeared. These devices have static reactive power generation. Generators, static synchronous compensators, active power filters, etc. This kind of dynamic reactive power compensation equipment is based on power electronic components and modern control theory as the core. It has the advantages of fast response, good compensation characteristics, accurate control, and continuous output adjustment. Its related theories and technologies have attracted widespread attention from the power industry and academia in various countries....

Claims

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Application Information

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IPC IPC(8): G01R19/00H02J3/18
CPCY02E40/30
Inventor 万黎
Owner STATE GRID HUBEI ELECTRIC POWER RES INST
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