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Modular parallel digital control electric harmonic wave active suppressing method and apparatus

A technology of digital control and power harmonics, applied in harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., to achieve the effects of improving flexibility, facilitating standardized production, improving reliability and anti-interference

Inactive Publication Date: 2005-09-28
ZHEJIANG UNIV
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Problems solved by technology

N+1 modules connected in parallel to the power grid

Method used

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  • Modular parallel digital control electric harmonic wave active suppressing method and apparatus
  • Modular parallel digital control electric harmonic wave active suppressing method and apparatus
  • Modular parallel digital control electric harmonic wave active suppressing method and apparatus

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Embodiment Construction

[0024] Such as figure 2 As shown, 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 are from nonlinear The grid current is sampled at the same point on the load side, and the sampled grid current is sent to the DSP control unit of each module. The harmonic current in the sampled grid current is calculated by the harmonic current detection method based on the instantaneous reactive power theory[1]. The current component, and then invert the harmonic current component and multiply it 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 In the / triangular wave comp...

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Abstract

The present invention discloses a modularized parallel digital control power harmonic active suppression method and its device. It includes N+1 digital control power harmonic active suppression modules which are parallelly connected to compensate harmonic wave, one of N+1 modules is redundant module, every module has a set of current sensors, and can be used for sampling electric network current from same point of non-linear load side, every module can calculate the harmonic current component from sampled electric network current, then the harmonic current component is phase-reversed, and multiplied by current-equalizing coefficient so as to obtain current instruction, then the hysteresis band control or triangle wave comparison control can be adopted to control output current and track current instruction change.

Description

[0001] technology field or [0002] The invention relates to a modularized parallel digital control power harmonic active suppression method and device. Background technique [0003] 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 type and series type. In order to apply to large-capacity harmonic suppression occasions, hybrid types, multiple main circuits, and multi-module parallel types have emerged. The multi-module parallel compensation method is more flexible. After usi...

Claims

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Application Information

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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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