Passivity-based control method of mid-point capacitor three-phase four-wire system SAPF (shunt active power filter)

A three-phase four-wire system, passive control technology, applied in the field of power grid, can solve the problems of being in the initial stage, ignoring the processing of zero-sequence components, and unable to feed back current through zero-sequence

Inactive Publication Date: 2019-06-21
DATANG ENVIRONMENT IND GRP
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Problems solved by technology

[0003] The development of the three-phase three-wire system SAPF is relatively mature, but it ignores the processing of the zero-sequence component. When the load is unbalanced, the curre...

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  • Passivity-based control method of mid-point capacitor three-phase four-wire system SAPF (shunt active power filter)
  • Passivity-based control method of mid-point capacitor three-phase four-wire system SAPF (shunt active power filter)
  • Passivity-based control method of mid-point capacitor three-phase four-wire system SAPF (shunt active power filter)

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Embodiment Construction

[0075] The present invention will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

[0076] Such as figure 1 As shown, the passive control method of a capacitor mid-point three-phase four-wire parallel active filter described in the embodiment of the present invention adopts nonlinear passive control from the viewpoint that the dynamic equation of SAPF is nonlinear It can be controlled by the controller without processing the positive and negative sequence components of the harmonics, and the control under the condition of grid balance / unbalance can be realized; at the same time, the design of the PI controller makes SAPF have a faster response speed, which can further Reduces the harmonic content of the supply current and is more robust. The company's approach specifically includes:

[0077] Step 1. Select the main circuit structure of the capacitive midpoint three-phase four-wire system SAPF. The three-pha...

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Abstract

The invention discloses a passivity-based control method of a mid-point capacitor three-phase four-wire system SAPF (shunt active power filter). The method comprises steps as follows: acquiring a mathematical model of an SAPF output side in a three-phase static uvw coordinate system; obtaining a voltage component and an inductive current component at the common ground point of the SAPF output sidein a dq0 coordinate system; obtaining a harmonic current component of three-phase load current in the dq0 coordinate system; obtaining direct current side master control current and differential pressure control current; acquiring a component of reference current in the dq0 coordinate system; obtaining a switch function of an SAPF output side switch function in the dq0 coordinate system; and obtaining a switch function of the three-phase SAPF. The method has the benefits as follows: control under the power grid balance/imbalance condition can be realized without processing of positive and negative sequence components of harmonic; adjustable parameters can be reduced, the passive controller structure is simplified, the response speed is higher, the harmonic content of power current can befurther reduced, and the method has higher robustness.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a passive control method for a capacitive midpoint three-phase four-wire parallel active filter. Background technique [0002] In recent years, with the development of power electronics technology, semiconductor nonlinear loads in power systems are increasing, and the introduction of these loads will generate a large number of harmonics and reactive power. 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. Shunt Active PowerFilter (SAPF), as a new type of power electronic device with ideal performance, dynamically suppresses harmonics and compensates reactive power, has better compensation effect and economical efficiency compared with traditional passive filters. benefit and has been widely used. [0003] The developme...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 姚学忠杨宁王铁民何睿钦李颖王为良
Owner DATANG ENVIRONMENT IND GRP
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