Command current extraction method and compensating current generation method for active power filter

A power filter, command current technology, applied in active power filter, harmonic reduction device, AC network to reduce harmonics/ripples, etc., can solve the problem of poor ability to suppress disturbances in the loop, and the compensation effect is not very good. Good, poor real-time performance, etc.

Inactive Publication Date: 2011-04-20
CHNA ENERGY INVESTMENT CORP LTD +2
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Problems solved by technology

There are many ways to extract the command current, such as the all-digital frequency domain filtering method based on fast Fourier transform, etc., but these methods either have a large delay, poor real-time performance, or the compensation effect is not very good. less impact on filter performance
However, the ability of the compensation current generated in the existing compensation current generation method to suppress the disturbance in the loop is usually not strong, and it will also affect the control accuracy of the compensation current

Method used

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  • Command current extraction method and compensating current generation method for active power filter
  • Command current extraction method and compensating current generation method for active power filter
  • Command current extraction method and compensating current generation method for active power filter

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Embodiment Construction

[0022] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0023] figure 1 A block diagram of an exemplary active power filter device is shown in .

[0024] like figure 1 As shown, the active power filter device includes a signal acquisition module 2 , a main control module 3 , a drive module 4 , a power conversion module 5 and a filter module 6 which are sequentially connected together. The signal acquisition module 2 and the filter module 6 are respectively connected to the three-phase power grid 1 , and the three-phase power grid 1 also has a nonlinear load 7 .

[0025] The signal collection module 2 is used for collecting signals from the three-phase power grid 1 and performing analog / digital (A / D) conversion on ...

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Abstract

The invention discloses a command current extraction method and a compensating current generation method for an active power filter. The command current is extracted by a digital phase-locked loop method and the compensating current is generated by a hysteresis current control method, so that the real time of an active power filtering device is improved, and the capability of the active power filtering device of inhibiting the disturbance in a loop is enhanced and the performance of a system is greatly improved.

Description

technical field [0001] The invention relates to the field of power filtering, in particular to a command current extraction method and a compensation current generation method for an active power filter. Background technique [0002] With the rapid development of modern industry, nonlinear loads such as high-power power electronic devices and electric arc furnaces have been widely used. At the same time, it has brought more and more serious reactive power problems and harmonic pollution to the power grid, making the voltage and current of the power grid The waveform is distorted, the power quality is degraded and the safety of the power grid is threatened. At present, harmonics have become a major public hazard to the power grid. [0003] There are various methods for suppressing grid harmonics. Passive filter technology is a traditional method of harmonic compensation, that is, several single-tuned and high-pass filter branches are installed near the harmonic source to by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/22Y02E40/40Y02E40/20
Inventor 赵剑王宏英毕平劲王强
Owner CHNA ENERGY INVESTMENT CORP LTD
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