Composite-control active filter based on high-compensated precision current loop and control method thereof

A composite controller, source filter technology, applied in reactive power compensation, AC network to reduce harmonics/ripple, reactive power adjustment/elimination/compensation, etc. problem, to achieve the effect of improving dynamic response, improving filtering performance, and improving steady-state accuracy

Pending Publication Date: 2017-05-10
HANGZHOU DECHENG ELECTRIC POWER TECH
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  • Abstract
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Problems solved by technology

"However, this invention patent needs to set the maximum error current response value, which does not belong to the closed-loop adaptive control, and cannot self-adjust with the dynamic change of the load current.
The entire control method adopts open-loop control. When the set value and the actual required value of the system load are too large, it is easy to produce over-compensation or under-compensation.
It is difficult to define the maximum error current response value in the entire control system. For places where the actual load change

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  • Composite-control active filter based on high-compensated precision current loop and control method thereof
  • Composite-control active filter based on high-compensated precision current loop and control method thereof
  • Composite-control active filter based on high-compensated precision current loop and control method thereof

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[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples, but the protection scope of the present invention is not limited thereto.

[0038] refer to figure 1 , the present invention is based on the compound control type active filter of the high compensation precision current loop, comprises the general control circuit of the active filter connected to the power grid on the sampling side, and the general control circuit of the active filter comprises a harmonic separation module; The output end of the harmonic separation module is sequentially connected to the load-side power grid through the current loop compound controller and the filter module; the output end of the filter module is connected to the input end of the current loop compound controller.

[0039] The current loop composite controller includes a current outer loop control system and a current inner loop control system.

[0040] The current...

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Abstract

The invention relates to the active filter current loop composite control technology field and especially relates to a composite-control active filter based on a high-compensated precision current loop and a control method thereof. The filter comprises an active-filter general control circuit connected to a sampling side power grid. The active-filter general control circuit comprises a harmonic wave separation module. An output terminal of the harmonic wave separation module is connected into a load side power grid successively through a current loop composite controller and a filtering module. An output terminal of the filtering module is connected to an input terminal of the current loop composite controller. By using the filter and the method of the invention, all the periodic errors contained in a stable closed loop can be effectively eliminated and stable state precision is increased.

Description

technical field [0001] The invention relates to the technical field of active filter current loop composite control, in particular to a composite control active filter and a control method based on a high compensation precision current loop. Background technique [0002] Since the birth of the thyristor, because of its derivative power electronic products constantly changing people's daily life, the superiority of the power electronic products based on the thyristor has attracted more and more attention and references. At the same time, a large number of power electronic devices based on nonlinear loads such as thyristors have been introduced into the power grid, resulting in serious harmonic pollution of the power grid. This is mainly due to the non-linear, impact and unbalanced power consumption characteristics of these loads. Therefore, the active filter technology used for harmonic suppression has gradually become one of the research hotspots in the fields of power elec...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02J3/18
CPCH02J3/01H02J3/18Y02E40/30Y02E40/40
Inventor 黄海宇李帮家安尔东王莉马庆华魏平杨奇楼科
Owner HANGZHOU DECHENG ELECTRIC POWER TECH
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