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Method for real time pre-compensating harmonic wave field dead region

A technology of pre-compensation and harmonic domain, which is applied in the field of real-time pre-compensation of dead zone in harmonic domain, can solve complex problems and achieve the effect of eliminating the adverse effects of dead zone

Inactive Publication Date: 2008-11-12
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the research at home and abroad focuses on the method of controlling the adverse effects of the dead zone effect and compensating the dead zone effect when the PWM inverter only outputs the fundamental wave, and it is more complicated to realize at the same time.

Method used

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  • Method for real time pre-compensating harmonic wave field dead region
  • Method for real time pre-compensating harmonic wave field dead region
  • Method for real time pre-compensating harmonic wave field dead region

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Embodiment Construction

[0021] see figure 1 , the comprehensive energy-saving system is composed of a separate injection hybrid active power filter and a thyristor-controlled reactor. The separate injection hybrid active power filter realizes the purpose of dynamic control of the grid harmonics and the harmonics caused by the thyristor control reactor; the composition of the thyristor control reactor realizes the dynamic compensation of the reactive power of the grid; the separate injection hybrid The joint operation of active power filter and thyristor control reactor realizes continuous adjustment of reactive power and dynamic control of harmonics, and achieves the purpose of comprehensive energy saving. Among them, the single-injection hybrid active power filter consists of a high-power inverter module, an output filter, and an injection branch (including a fundamental resonance branch and an injection capacitor). The high-power inverter module is connected to the The fundamental resonant branch ...

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Abstract

The invention discloses a real time pre-compensation method for a harmonic region dead zone. Coordinate transformation is used for detecting 6-frequency doubling harmonic components so that control signals of an inverter and a controller are modified; the aim of completely eliminating the dead zone influence is achieved. The method is simple and effective, can achieve the aim of completely eliminating the dead zone influence and is easy to realize a project.

Description

technical field [0001] The invention relates to the problem of harmonic control in the power grid, in particular to a real-time pre-compensation method for the dead zone in the harmonic domain. Background technique [0002] With the wide application of nonlinear loads in the power system, insufficient reactive power compensation and harmonic pollution are becoming more and more serious. The injection hybrid active power filter has been widely used because its active part does not bear the fundamental wave component. The basic working principle of its active part is to detect the harmonic current of the compensation object, and to compensate by controlling the PWM inverter as the main circuit to emit harmonics of the same magnitude and opposite directions. Since the power switching element itself in the main circuit of the PWM inverter is not an ideal switching device, in order to prevent the inverter from having a shoot-through fault, a dead time T must be set in its driving...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02M7/42
CPCY02E40/40
Inventor 罗安帅智康程莹吴传平浣威杨晓
Owner HUNAN UNIV