Control method of three-phase four-wire system VIENNA rectifier under nonlinear inductance
A technology of three-phase four-wire system and control method, which is applied in the field of control of three-phase four-wire VIENNA rectifiers to achieve the effects of easy digital control, simple control method and wide applicability
Active Publication Date: 2021-11-09
SOUTHEAST UNIV
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Problems solved by technology
[0004]Aiming at the above-mentioned problems, the present invention conducts in-depth research on the influence of current changes on the inductance of magnetic powder cores, and designs a method that can effectively reduce the inductance due to powder core inductance. The problem of increased current distortion rate caused by nonlinearity, wide applicability
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[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0051] The control method of the three-phase four-wire system VIENNA rectifier under a kind of nonlinear inductance of the present invention, the subsection control steps are as follows:
[0052] S1: According to the knowledge of physics, the inductance coefficient A LThat is, the square of the number of turns per Nahenn, which is essentially the magnetic permeability G, that is, the magnetic resistance R m The inverse of:
[0053]
[0054] In the formula: A ...
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The invention discloses a control method of a three-phase four-wire system VIENNA rectifier under a non-linear inductor. A segmented control method comprises the following steps of constructing a relationship between the inductance and the current in the three-phase four-wire system VIENNA rectifier; determining a maximum value and a minimum value of an inductor in the three-phase four-wire system VIENNA rectifier under a full-load working condition; designing a segmented controller according to the maximum variation range of the inductance value of the three-phase four-wire system VIENNA rectifier; and determining the switching principle of each section of controller according to the magnitude of the instantaneous value of the input current of the three-phase four-wire system VIENNA rectifier. According to the segmented control method, the problem that the input current of a power factor correction circuit is distorted and increased due to nonlinearity of the inductor, can be effectively solved; the method is high in reliability and wide in applicability, and can be used for most power factor correction circuits; the control method is simple, and the digital control can be easily achieved through a DSP or a single-chip microcomputer; the cost is low, and additional devices or apparatuses are not needed.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a control method for a three-phase four-wire VIENNA rectifier under nonlinear inductance. Background technique [0002] With the development of modern power electronics technology, the industry has higher and higher requirements for power electronic equipment, and more and more inductor materials have changed from the original ferrite and silicon steel sheets to magnetic powder cores. Magnetic powder cores are widely used due to many advantages such as no need to open an air gap, less magnetic flux, good electromagnetic compatibility, high saturation magnetic flux density, small size, etc., but they bring various advantages and disadvantages at the same time. Equipment safety and reliability have become the top priority of power electronics design. [0003] Because the air gap of the magnetic powder core is different from the traditional centralized air gap, its air ga...
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Login to View More IPC IPC(8): H02M7/217H02M1/42H02M1/12
CPCH02M7/217H02M1/4216H02M1/12H02M7/2173Y02B70/10
Inventor 王念春朱亚铭
Owner SOUTHEAST UNIV