Filtering method used for three-phase unbalanced load compensation device

A technology of balanced compensation and three-phase load, which is applied in harmonic reduction devices and AC networks to reduce harmonics/ripples, etc. It can solve the problems of sampling accuracy impact, sampling signal easy to oscillate, etc., and eliminate resonance or spike signals Effect

Inactive Publication Date: 2016-10-05
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Abstract
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Problems solved by technology

[0002] In general user power equipment sampling systems, only ordinary low-pass filters are used. When the sampling and inverter commutation of each unit of the filter occurs at the same time, the sampling signal is prone to oscillation. If only ordinary low-pass filters are used filter, the sampling accuracy is bound to be affected

Method used

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  • Filtering method used for three-phase unbalanced load compensation device
  • Filtering method used for three-phase unbalanced load compensation device

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Embodiment Construction

[0011] See figure 1 with figure 2 In order for the inventor of the present invention to better understand the technical solutions of the present invention, the following detailed descriptions are given through specific embodiments in conjunction with the accompanying drawings:

[0012] See figure 1 with figure 2 The three-phase load imbalance compensation device includes a first bridge arm formed by IGBT switch T1 and IGBT switch T2 in series, a second bridge arm formed by IGBT switch T3 and IGBT switch T4 in series, and IGBT switch T5 and IGBT switch T6 are connected in series. The third bridge arm, the fourth bridge arm formed by the IGBT switch T7 and the IGBT switch T8 in series, and the DC capacitor.

[0013] The first bridge arm, the second bridge arm, the third bridge arm, the fourth bridge arm, and the DC capacitor C are connected in parallel with each other.

[0014] The X point of the first bridge arm, the Y point of the second bridge arm, and the Z point on the third bri...

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Abstract

The invention discloses a filtering method used for a three-phase unbalanced load compensation device. The method comprises the following steps of a charging direct voltage signal integration acquisition step: integration is performed on a direct voltage signal generated when the three-phase unbalanced load compensation device is charged from zero, wherein the direct voltage signal is a Ch1 signal, at an assigned moment, the Ch1 signal is started to be sampled, simultaneously a direct voltage signal generated when the three-phase unbalanced load compensation device discharges maintains a zero voltage till that the sampling of the Ch1 signal is completed and the signal returns to zero, wherein the direct voltage signal is a Ch2 signal; a discharge direct voltage signal integration acquisition step: integration is performed on the direct voltage signal generated when the three-phase unbalanced load compensation device discharges from zero, wherein the direct voltage signal is the Ch2 signal, at an assigned moment, the Ch2 signal is started to be sampled, simultaneously the direct voltage signal generated when the three-phase unbalanced load compensation device is charged maintains a zero voltage till that the sampling of the Ch2 signal is completed and the signal returns to zero, wherein the direct voltage signal is the Ch1 signal; and a returning step: the charging direct voltage signal integration acquisition step is returned to.

Description

Technical field [0001] The invention relates to a filtering method for a three-phase load imbalance compensation device in the field of power electronics. Background technique [0002] In general consumer power equipment sampling systems, only ordinary low-pass filters are used. When the commutation of each unit of the sampling and inverter equipment occurs at the same time, the sampling signal is prone to oscillation. If only ordinary low-pass filters are used Filter, sampling accuracy will inevitably be affected. Summary of the invention [0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a filtering method for a three-phase load imbalance compensation device, which can eliminate the resonance or spike signal of the three-phase load imbalance compensation device at the moment of IGBT switch commutation . [0004] A technical solution to achieve the above objective is: a filtering method for a three-phase load imbalance compe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 王伟峰陈永福冯文俊解蕾杨嘉俊廖文廖强强仲隽伟
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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