Three-phase unbalanced load current active compensation control method

A load balancing and compensating control technology, applied in the direction of multi-phase network asymmetry reduction, reactive power adjustment/elimination/compensation, multi-phase network elimination/reduction of asymmetry, etc., to achieve strong applicability, good effect and accuracy high effect

Pending Publication Date: 2020-04-10
NORTHEAST DIANLI UNIVERSITY +1
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Problems solved by technology

[0004] The object of the present invention is to provide a kind of three-phase unbalanced load c...

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  • Three-phase unbalanced load current active compensation control method
  • Three-phase unbalanced load current active compensation control method
  • Three-phase unbalanced load current active compensation control method

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Embodiment Construction

[0020] The detailed content of the present invention and its specific implementation will be further described below in conjunction with the accompanying drawings.

[0021] see Figure 1 to Figure 5 As shown, the three-phase unbalanced load current active compensation control method of the present invention proposes an improved instantaneous power theory for the basic structure and working principle of the two-level SVG, which is only applicable to the three-phase three-wire system compared with the traditional instantaneous power theory Compatible with any system. For the extraction of command current, a software phase-locked loop phase-locking method based on a single synchronous coordinate system is proposed, which can quickly and accurately extract the grid phase when the grid is balanced. Aiming at the current control algorithm, a current control method based on model predictive control is proposed, which can provide fast dynamic response, flexible and simple method, and...

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Abstract

The invention relates to a three-phase unbalanced load current active compensation control method, and belongs to the field of electric energy treatment. Instantaneous power is improved according to abasic structure and a working principle of the two-level SVG, and current is decomposed to a synchronous rotating coordinate system instead of directly decomposing the power according to a traditional instantaneous power theory. Aiming at the extraction of instruction current, a software phase-locked loop phase-locked method based on a single synchronous coordinate system is adopted, an SPLL linearized model is obtained based on a dq coordinate transformation principle, and a novel three-phase SPLL is realized through PI control. For a current control algorithm, a current control method basedon model predictive control is adopted. The three-phase unbalanced circuit can be compensated in real time, and can be conveniently applied to an actual power system. The method is flexible, simple and high in accuracy. The method has the advantages of being scientific, reasonable, high in applicability, high in reliability and good in effect.

Description

technical field [0001] The invention relates to the field of electric energy management, in particular to a three-phase unbalanced load current active compensation control method. Background technique [0002] Electricity is an indispensable form of energy in modern human society. With the rapid development of modern power electronics technology, especially in recent years, the wide application of power electronic devices in power systems, various industrial sectors and household appliances, the power system The safe, stable and economical operation constitutes a potential threat, which seriously affects the power quality and even endangers the safe operation of the power system. At the same time, various sophisticated electronic devices have higher and higher requirements for power quality, so improving power quality has become an unresolved problem for the power sector and users. Reactive power is an important measure of power quality, and its compensation is related to m...

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Application Information

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IPC IPC(8): H02J3/26H02J3/18H02J3/38
CPCH02J3/26H02J3/18H02J3/38Y02E40/10Y02E40/50
Inventor 辛业春王威儒王延旭陈厚合雷司宇陈洪涛何琦彭海超张静伟张晶玉谭聪刘丽静
Owner NORTHEAST DIANLI UNIVERSITY
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