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Capacitive midpoint three-phase four-wire sapf hybrid passive nonlinear control method

A nonlinear control, three-phase four-wire system technology, applied in the field of micro-grid, achieves good control effect, good control effect and improved dynamic performance

Active Publication Date: 2018-11-27
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Application Information

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Problems solved by technology

The research on introducing PBC to the capacitive mid-point three-phase four-wire system is still in its infancy

Method used

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  • Capacitive midpoint three-phase four-wire sapf hybrid passive nonlinear control method
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Embodiment Construction

[0045] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0046] Such as figure 1 The capacitor midpoint three-phase four-wire system SAPF circuit structure is shown, the three-phase voltage output is connected to the nonlinear load, the capacitor midpoint three-phase four-wire system SAPF is connected between the three-phase voltage and the nonlinear load, and the capacitor midpoint type The three-phase four-wire system SAPF includes three sets of switching arms connected in parallel, and a capacitor C connected in parallel with the switching arms. f1 、C f2 , and the filter inductance L of the contacts a, b, and c between the upper and lo...

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Abstract

The invention relates to a capacitor middle point type three-phase four-wire system SAPF hybrid passive non-linear control method comprising the following steps: in step S1, a harmonic wave current instruction is obtained; in step S2, difference between direct current side total voltage and direct current side capacitor voltage can be obtained according to capacitor voltage of upper and lower bridge arms at a direct current side in an SAPF, and a total voltage control current instruction and a differential voltage control current instruction are obtained via a total voltage controller and a differential voltage controller; in step S3, a reference current instruction is obtained; in step S4, three phase voltage of a PCC, a three phase inductive current of an output side of the SAPF and the reference current instruction are input into a current inner ring passive controller, and switching value of the SAPF in a dq0 coordinate system can be obtained; in step S5, switching value of the SAPF in a three phase static coordinate system can be obtained. Compared with technologies of the prior art, the method disclosed in the invention can be used for harmonic and reactive compensation for a three phase balance system and can also be used for compensating a zero sequence harmonic wave component generated via a non-linear load in power grid imbalance conditions, and excellent dynamic and static performance can be achieved.

Description

technical field [0001] The invention relates to micro-grid technology, in particular to a capacitive mid-point three-phase four-wire SAPF hybrid passive nonlinear control method. Background technique [0002] In recent years, with the development of power electronics technology, semiconductor nonlinear loads are increasing in the power system. The introduction of these loads will generate a large number of harmonics and reactive power, which poses a threat to the power quality of the grid. Shunt Active Power Filter (SAPF), as a new type of power electronic device with ideal performance to dynamically suppress harmonics and compensate reactive power, has better compensation effect and Economic benefits, so it has been widely used. [0003] The three-phase three-wire system SAPF is relatively mature, but it ignores the processing of zero-sequence components. The three-phase four-wire system SAPF overcomes this shortcoming, not only can compensate the harmonics and reactive po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/18H02J3/26
CPCH02J3/01H02J3/1821H02J3/26Y02E40/30Y02E40/40Y02E40/50
Inventor 程启明张宇谭冯忍高杰余德清孙伟莎陈路李涛
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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