Structure and control method of a hybrid harmonic suppressor

A harmonic suppressor and hybrid technology, applied in harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., can solve the problem of uncontrollable current in passive filters, and achieve simple structure, low cost, Quickly compensate for reactive effects

Active Publication Date: 2020-10-16
GUANGDONG UNIV OF TECH
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Problems solved by technology

The organic combination of the active part and the passive part solves the defect that the current of the existing passive filter is uncontrollable, so that the system has the advantages of low cost of the passive solution and fast compensation of reactive power and suppression of harmonics by the active solution

Method used

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  • Structure and control method of a hybrid harmonic suppressor
  • Structure and control method of a hybrid harmonic suppressor
  • Structure and control method of a hybrid harmonic suppressor

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Embodiment Construction

[0020] The invention provides a structure of a hybrid harmonic suppressor and a control method thereof, which can effectively suppress the influence of power harmonics generated by nonlinear loads on a power grid.

[0021] In order to make the object, technical solution and effect of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings. according to figure 1 The connection mode constitutes a hybrid harmonic suppressor, and the system mainly includes two parts: active filtering and passive filtering. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. Here we take the suppression of the 5th harmonic as an example to introduce the specific implementation method:

[0022] (1) According to the application, select the specific sub-harmonic frequency that needs to be filtered out a...

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Abstract

The invention discloses a hybrid harmonic suppressor structure and a control method thereof. The hybrid harmonic suppressor structure is formed by series connection of an active part and a passive part. The topology active part mainly includes a direct-current-side capacitor C, a voltage type converter, an output filter inductor L1 and a parallel capacitance C1; and the passive part includes essentially a passive power filter consisting of an L2 and a C2. Because the passive part bears the most of grid voltages, the working voltage of the active part can be reduced, so that the capacity of the active part can be reduced; and the active part has a function of suppressing a selective harmonic current. On the basis of organic combination of the active part and the passive part, a defect that the existing passive filter current can not be controlled can be overcome.

Description

technical field [0001] The invention relates to the field of power harmonic suppression, in particular to a structure of a hybrid harmonic suppressor and a control method thereof. Background technique [0002] At present, power electronic equipment is widely used in all walks of life. The use of these equipment brings a large number of power harmonics and reactive components to the power system, resulting in serious distortion of the grid voltage and grid current waveform, resulting in a decline in power quality. , can cause electrical equipment failure and accidents. [0003] In order to suppress the impact of the power harmonics generated by these loads on the power grid, there are three commonly used schemes: parallel active filter (APF), passive filter (PPF) and hybrid active filter (HAPF). The passive filter is composed of reactors, capacitors and resistors, which can compensate reactive power and suppress specific harmonic currents. Harmonic currents are amplified, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 张淼庞卓标唐雄民刘日升郝雪冬
Owner GUANGDONG UNIV OF TECH
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