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Instantaneous symmetrical component method-based current detection method for distribution static synchronous compensator (DSTATCOM)

A symmetrical component method and instantaneous symmetry technology, which is applied in the direction of measuring current/voltage, measuring electrical variables, reactive power/actual component measurement, etc., can solve problems that cannot represent instantaneous values, cannot meet the requirements of real-time and accuracy, etc.

Inactive Publication Date: 2011-06-01
STATE GRID CORP OF CHINA +3
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Problems solved by technology

[0002] The current symmetrical component method is based on the analysis method of the three-phase asymmetrical system under steady-state conditions. It expresses the sequence components (positive sequence, negative sequence and zero sequence) of the three-phase asymmetric variables in the form of complex numbers or differentials. In the process, a 90° phase shift is required to obtain the instantaneous value of each sequence component, but the instantaneous value at this time cannot represent the instantaneous value because it contains a 90° phase shift, so it cannot satisfy the requirements for each sequence component in some three-phase asymmetrical systems. Applications that require high real-time and accuracy of sequence component detection

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  • Instantaneous symmetrical component method-based current detection method for distribution static synchronous compensator (DSTATCOM)
  • Instantaneous symmetrical component method-based current detection method for distribution static synchronous compensator (DSTATCOM)
  • Instantaneous symmetrical component method-based current detection method for distribution static synchronous compensator (DSTATCOM)

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Embodiment Construction

[0066] The invention discloses a DSTATCOM current detection method based on the instantaneous symmetrical component method, which comprises the following steps:

[0067] Step 1, first determine the representation method of the symmetric component method and the instantaneous value in the phasor time domain:

[0068] First, the voltage phasor is decomposed into three sets of symmetrical phasors by using the symmetrical component method, namely positive sequence, negative sequence and zero sequence components, such as formula (1) - formula (3), where U a , U b , U c is the three-phase voltage phasor, U a + , U b + , U c + , U a - , U b - , U c - , U 0 , are positive sequence, negative sequence and zero sequence components respectively, α=e j2π / 3 ,

[0069] U a + U b ...

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Abstract

The invention discloses an improved instantaneous symmetrical component method-based current detection method for a distribution static synchronous compensator (DSTATCOM), which comprises the following steps of: 1, determining a symmetrical component method and a method for expressing an instantaneous value in a phasor time domain; 2, determining the instantaneous value; 3, implementing the improved instantaneous symmetrical component method; 4, establishing a model by adopting a MATLAB simulation tool to perform simulation analysis on a conclusion; 5, filtering, converting and processing data; and 6, subtracting obtained three phases of positive fundamental active currents iafp<+>, ibfp<+> and icfp<+> from a load current to obtain required comprehensive compensation command currents iac, ibc and icc comprising harmonic components, negative sequence components and reactive components. The method avoids a complex phase shift circuit, a phase locked loop circuit, and an address generator and a table lookup process of sine and cosine function table, and eliminates errors and faults caused thereby.

Description

technical field [0001] The invention relates to a DSTATCOM current detection method based on the instantaneous symmetrical component method. Background technique [0002] The current symmetrical component method is based on the analysis method of the three-phase asymmetrical system under steady-state conditions. It expresses the sequence components (positive sequence, negative sequence and zero sequence) of the three-phase asymmetric variables in the form of complex numbers or differentials. In the process, a 90° phase shift is required to obtain the instantaneous value of each sequence component, but the instantaneous value at this time cannot represent the instantaneous value because it contains a 90° phase shift, so it cannot satisfy the requirements for each sequence component in some three-phase asymmetrical systems. Applications that require high real-time and accuracy of sequence component detection. For the distribution network synchronous compensation device (Distr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R19/06
Inventor 许杏桃许胜丁伟卢春李进
Owner STATE GRID CORP OF CHINA
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