Active current extraction method based on orthogonal sine wave integral modulation

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 notcontain 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 an electric power system, in particular to a method for extracting active current. Background technique [0002] The reactive power and harmonic compensation of the power system has been one of the hot areas that the power system has been concerned about for a long time. With the development of modern power electronics technology, a new type of dynamic reactive power compensation device has emerged. These devices have static var devices, static synchronous compensators, active power filters, etc. This kind of dynamic reactive power compensation equipment is based on power electronic components and takes modern control theory as the core. It has the advantages of fast response, good compensation characteristics, precise control, and continuous output adjustment. Its related theories and technologies have attracted extensive attention from the power industry and academia in various countrie...

AI Technical Summary

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 detect, and finally take the result of one phase, the process is complicated and the calculation cost is large

[0017] 4) The use of low-pass filter reduces the transient response characteristics, and it is difficult to realize instantaneous detection

The harmonic measurement method based on neural network technology is still in the stage of theoretical research and simulation analysis, and the theoretical research in this area is not yet mature enough, and there is still a certain distance from practical application

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