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Vector number-variable direct power control method for three-phase power converter

A three-phase power and power control technology, which is applied in the direction of converting AC power input into DC power output, output power conversion device, AC network circuit, etc. Steady-state ripple, etc.

Inactive Publication Date: 2015-05-13
HENAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the traditional direct power control vector table obtained on the basis of instantaneous power theory, there are two non-zero vectors that can increase active power and increase reactive power, and can increase active power and decrease reactive power, instead of one, resulting in Active power has a large steady-state ripple

Method used

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  • Vector number-variable direct power control method for three-phase power converter
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  • Vector number-variable direct power control method for three-phase power converter

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Embodiment Construction

[0008] The present invention will be further described below in conjunction with the accompanying drawings.

[0009] The topology of the main circuit of the three-phase power converter is as follows: figure 1 shown. In the figure, u ga , u gb , u gc is a three-phase voltage source on the AC side, i ga , i gb , i gc is the three-phase current on the AC side, v ga , v gb , v gc is the three-phase voltage at the input side of the converter, U dc is the DC side bus voltage, L with R are the incoming inductance and its equivalent resistance, respectively, C is a DC filter capacitor, and the DC side load is composed of a resistor R L equivalent representation.

[0010] The mathematical model of the three-phase power converter can be transformed into the two-phase stationary coordinate system through coordinate transformation, expressed as

[0011] (1)

[0012] In the formula: u gα , u gβ Respectively, the α and β axis grid ...

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Abstract

The invention discloses a vector number-variable direct power control method for a three-phase power converter. The method comprises the following steps: obtaining an improved vector table on the basis of an instantaneous power theory, namely, introducing one or two non-zero vectors or a zero vector in a control period at the same time; selecting two or three optimal voltage vectors which can reduce the errors between active power as well as reactive power and reference values at the same time from the improved vector table according to a sector in which a power grid voltage position angle is positioned, actual values of the active power and the reactive power, and the reference values of the active power and the reactive power. The method disclosed by the invention is easy to control, simple in algorithm and easy to implement; the fluctuation of the active power and current harmonics can be reduced obviously; the control quality of a system is guaranteed.

Description

technical field [0001] The invention belongs to the field of converter control of power electronics and electric transmission, and in particular relates to a direct power control method of variable vector number of a three-phase power converter. Background technique [0002] The three-phase voltage-type pulse width modulation converter is widely used in rectification, AC speed regulation, active filtering, reactive power compensation and new energy grid-connected power generation due to its good input current sine degree, unit power factor, and energy bidirectional flow. and other fields. The classic control methods mainly include grid voltage oriented control (VOC) and direct power control (direct power control, DPC). In DPC, the quality of the switch table directly affects the control performance of the entire system. At present, there are many ways to establish the switch table: modeling and analyzing the converter from the perspective of power conservation; analyzing th...

Claims

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Application Information

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IPC IPC(8): H02M7/219
CPCH02J3/1842H02J3/01H02M7/5387
Inventor 王萌祁明艳施艳艳马鹏飞高金辉
Owner HENAN NORMAL UNIV
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