A hybrid dynamic reactive power compensation device and method with resonance suppression function

A technology of resonance suppression and compensation device, applied in reactive power compensation, reactive power adjustment/elimination/compensation, reduction/prevention of power oscillation, etc. , the sensitivity of system parameters, etc., to achieve the effect of good engineering application significance, reduction of damping resonance, and optimal adjustment

Active Publication Date: 2017-02-22
XI AN JIAOTONG UNIV
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Problems solved by technology

However, this method has certain limitations. When the harmonic spectrum of the power grid changes, the series reactor cannot guarantee that the reactive power branch is always inductive in all harmonic bands, and the harmonics may still be amplified.
Another method is to use a hybrid active power filter for resonance suppression, but the hybrid filter is very sensitive to system parameters, and changes in system parameters will make its control effect worse
In addition, the traditional hybrid filter does not introduce the function of dynamic reactive power compensation, because this will increase the capacity of the converter and increase the cost

Method used

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  • A hybrid dynamic reactive power compensation device and method with resonance suppression function
  • A hybrid dynamic reactive power compensation device and method with resonance suppression function
  • A hybrid dynamic reactive power compensation device and method with resonance suppression function

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[0029] The present invention is described in further detail below in conjunction with accompanying drawing:

[0030] refer to Figure 7 , the hybrid dynamic reactive power compensation device with resonance suppression function of the present invention includes converters and reactive power compensators connected in series in sequence, and the reactive power compensator includes several reactive power compensation branches connected in parallel, each reactive power The compensation branches are all composed of switches, capacitors and inductors connected in sequence.

[0031] The hybrid dynamic reactive power compensation method with resonance suppression function described in the present invention comprises the following steps:

[0032] 1) Detect the load current, and obtain the reactive component of the load current through a reactive power detection algorithm according to the load current, and then control the switches in each reactive power compensation branch in the reac...

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Abstract

The present invention discloses a hybrid dynamic reactive power compensation device with a resonance suppression function and method. The device comprises a converter and a reactive power compensator in series connection, wherein the reactive power compensator comprises several reactive power compensation branches in parallel connection, the reactive power compensation branches being composed of a switch, a capacitor and an inductor connected in turn. According to the present invention, continuous reactive power compensation and resonance suppression with low cost and large capacity can be achieved.

Description

technical field [0001] The invention belongs to the technical field of power quality control of electric power systems, and relates to a hybrid dynamic reactive power compensation device and method with a resonance suppression function. Background technique [0002] In power systems, shunt capacitors are often used for reactive power compensation. However, the compensation capacity of parallel capacitors is fixed, and continuous reactive power compensation cannot be realized. At the same time, with the wide application of nonlinear loads in the power system, harmonic currents and voltages will be generated, which will cause resonance between the reactive power compensation capacitor and the grid line impedance, triggering the harmonic protection of parallel capacitors to trip, affecting normal reactive power. power compensation. [0003] Usually, in order to achieve continuous reactive power compensation, STATCOM and shunt capacitors will be used in combination, and the tw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/18H02J3/24
CPCY02E40/30
Inventor 雷万钧张凯陈明锋王跃
Owner XI AN JIAOTONG UNIV
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