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npc type three-level three-phase four-wire sapf nonlinear passive control method

A three-phase four-wire system, passive control technology, applied in the field of microgrid

Active Publication Date: 2019-12-24
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The research on introducing PBC to NPC type three-level three-phase four-wire system is still in its infancy

Method used

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Embodiment Construction

[0089] Such as figure 2 The non-linear passive control block diagram of the NPC type three-level three-phase four-wire system SAPF shown, the non-linear passive control method of a kind of NPC type three-level three-phase four-wire system SAPF provided by the embodiment of the present invention, from The dynamic equation of SAPF starts from the nonlinear point of view. Through the method of step S5, the nonlinear passive controller is used to control it, so that the controlled quantity-compensation current can be completely decoupled; not only can the harmonics of the three-phase balanced system and reactive power compensation, and can compensate the harmonic component generated by the nonlinear load when the power grid is unbalanced; through the method of step S7, the introduction of the adjustment factor f can maintain the DC side capacitor voltage balance. The specific steps of the control method are as follows:

[0090] Step S1: According to figure 1 The main circuit st...

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Abstract

The present invention relates to an NPC type three-level three-phase four-wire SAPF nonlinear passive control method. Passive control is used for inner loop current, and PI control is used for outer loop voltage. The strict passivity is analyzed according to an EL mathematical model of an NPC type three-level three-phase four-wire SAPF in a dq0 coordinate system, and an inner loop current passive control rule which allows a controlled variable to converge to an expected value is obtained through calculation. The rule is optimized by using a damping injection method, a new passive control rule which can allow inner loop compensation current to be completely decoupled is obtained, and the dynamic performance of a system is improved. According to the principle of conservation of energy, proportional integral PI is used to control DC side voltage. According to the principle of charge balance, a regulation factor f is introduced, the action times of positive and negative small vectors in an SVPWM modulation algorithm are regulated, and the balance of DC side voltage is maintained. Harmonic, zero sequence and reactive current generated by a nonlinear load are reduced or eliminated, at the same time, the total voltage of a DC side capacitor is maintained to be stable, and an upper and lower capacitance differential pressure is maintained at 0.

Description

technical field [0001] The invention relates to a micro-grid technology, in particular to an NPC type three-level three-phase four-wire SAPF nonlinear passive control method. Background technique [0002] In recent years, with the rapid development of power electronics technology, various power electronic devices (such as energy-saving control devices, AC-DC converters, semiconductor nonlinear loads and household lighting devices, etc.) The quality keeps dropping. Although the traditional passive filter is simple in structure and convenient in operation and maintenance, it can only eliminate specific harmonics, and it is easy to generate resonance with the power grid. The shunt active power filter (SAPF) has flexible compensation characteristics, can dynamically compensate any harmonic, and effectively overcomes the defects of passive filters, so it has become a research hotspot in recent years. [0003] The three-phase three-wire system SAPF is relatively mature, but it i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/18
CPCH02J3/01H02J3/1842H02J2203/20Y02E40/30Y02E40/40
Inventor 程启明张宇谭冯忍高杰余德清陈路李涛孙伟莎程尹曼
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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