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Active suppressing apparatus for modularized parallel digital control electric harmonic

A digital control, power harmonic technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., to improve flexibility, improve reliability and anti-interference, excellent compensation performance and high real-time performance Effect

Inactive Publication Date: 2007-08-08
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

N+1 modules connected in parallel to the power grid

Method used

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  • Active suppressing apparatus for modularized parallel digital control electric harmonic
  • Active suppressing apparatus for modularized parallel digital control electric harmonic
  • Active suppressing apparatus for modularized parallel digital control electric harmonic

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Embodiment Construction

[0025] As shown in Figure 2, N+1 digitally controlled power harmonic active suppression modules are connected to the power grid in parallel to compensate the harmonic current of the power grid. Each digitally controlled power harmonic active suppression module has a set of current sensors. These current sensors The grid current is sampled from the same point on the nonlinear load side, and the sampled grid current is sent to the DSP control unit of each module. Through the harmonic current detection method based on the instantaneous reactive power theory [1], the sampled grid current is calculated. The harmonic current component of the harmonic current component is reversed and multiplied by the current sharing coefficient from the MCU monitoring unit to obtain the current command. Then, the DSP control unit sends the current command to the hysteresis control / triangular wave comparison control unit. In the hysteresis control / triangular wave comparison control unit, the current ...

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Abstract

The invention discloses one module parallel digital control resonance source suppression device, which comprises orderly single machine monitor unit, DSP control unit, break ring control or triangle wave comparison control unit, drive circuit, three-phase semi-bridge inverter circuit, wherein, the DSP control unit is connected to voltage sensor, voltage sensor, current sensor; the break control or triangle comparer control unit is connected to current sensor.

Description

[0001] The present invention is a divisional application with the application number 200510049420.X, the application date is March 22, 2005, and the invention name is the modular parallel digital control power harmonic active suppression method and device. [0002] technology field or [0003] The invention relates to a modular parallel digital control power harmonic active suppression device. Background technique [0004] In 1976, Gyugyi first proposed the active power filter (Active Power Filter). In 1983, Akagi Taifumi and others proposed the "instantaneous reactive power theory of three-phase circuit". The harmonic current detection method based on this theory is used in active power filter It has been successfully applied in the device [1], which has greatly promoted the development of active power filters. In recent years, active power filters have been one of the hotspots in academia and industry. The structural types of active power filters mainly include parallel typ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 徐德鸿鞠建永陈敏陈仲王华凤徐君
Owner ZHEJIANG UNIV
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