Two-phase static coordinate system based direct power control method of three-phase voltage source type rectifier

A static coordinate system, three-phase voltage technology, applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc. Realization, simple structure, high power response speed effect

Inactive Publication Date: 2018-09-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Direct power control based on grid voltage orientation or virtual flux linkage orientation needs to obtain the corresponding position signal through phase-locked loop technology.

Method used

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  • Two-phase static coordinate system based direct power control method of three-phase voltage source type rectifier
  • Two-phase static coordinate system based direct power control method of three-phase voltage source type rectifier
  • Two-phase static coordinate system based direct power control method of three-phase voltage source type rectifier

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Embodiment Construction

[0032] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] Such as figure 1 As shown, the main circuit topology of the three-phase voltage source rectifier in this example includes the load resistor R L , DC side capacitor C, six IGBTs, connection reactor L and connection resistance R between the AC side of the rectifier and the grid, etc. e sa 、e sb and e sc is the three-phase grid voltage, i sa i sb and i sc is the three-phase grid current, u dc is the DC side capacitor voltage, i dc is the total current of the DC side of the rectifier, i C is the DC side capacitor current, i L is the load current, the direction indicated by the arrow is the positive direction of the current, and L and R are the inductance and resistance values ​​of the AC side, respectively. The steps of the three-phase volta...

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Abstract

The invention discloses a two-phase static coordinate system based power control method of a three-phase voltage source type rectifier direct. With the adoption of the method, the active power and thereactive powder output by the system can be directly controlled under a two-phase static coordinate system on the premise that the capacitance and the voltage at the DC side are stable, so that the active powder demand and the reactive powder demand of the system can be rapidly responded; the vector angle information of the voltage of the power grid is not extracted, and the direction fixing of the voltage of the power grid can be accurately realized in case of three-phase unbalancing. The method is applicable to the situation with a three-phase voltage source type rectifier, and the abnormalvariation of the voltage of the power grid can be effectively responded.

Description

technical field [0001] The invention belongs to the technical field of rectifier control, and in particular relates to a direct power control method of a three-phase voltage source rectifier based on a two-phase stationary coordinate system. Background technique [0002] With the development of modern power electronics technology, the three-phase voltage source rectifier has the advantages of sinusoidal current on the grid side, unit power factor operation, and bidirectional energy transmission. Therefore, the rectifier is widely used in new energy fields such as UPS (Uninterruptable Power Supply), AC speed regulation, wind power generation and photovoltaic power generation. For the three-phase voltage type rectifier, grid-connected control is the basic requirement, and its control performance directly affects the application of the rectifier. The existing rectifier grid-connected control technologies mainly include Voltage Oriented Congtrol, Virtual-flux Oriented Control, ...

Claims

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Application Information

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IPC IPC(8): H02M7/219
CPCH02M7/219
Inventor 陈泉坤
Owner ZHEJIANG UNIV
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