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AC/DC bus interface converter control strategy based on virtual inertia

An interface converter and virtual inertia technology, which is applied in the field of AC-DC bus interface converter control strategy based on virtual inertia, can solve the problems of slow dynamic recovery process, large overshoot, transmission power deviation, etc.

Active Publication Date: 2022-02-18
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] What the invention aims to solve is that the control strategy of the traditional AC-DC bus interface converter has technical problems such as large overshoot, slow dynamic recovery process, and transmission power deviation in the process of bidirectional power flow.

Method used

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  • AC/DC bus interface converter control strategy based on virtual inertia
  • AC/DC bus interface converter control strategy based on virtual inertia
  • AC/DC bus interface converter control strategy based on virtual inertia

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Experimental program
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specific Embodiment approach

[0049] The specific implementation method comprises the following steps:

[0050] Step 1, first collect the DC subnet voltage on the DC side of the AC-DC bus interface converter and the AC subnet voltage on the AC side, and obtain the frequency of the AC subnet by passing the AC subnet voltage through a phase-locked loop.

[0051] Step 2, the collected DC voltage and AC frequency are normalized by formulas (1) and (2) to obtain the per unit value f of the standard value p.u and V p.u . The per unit value f of the standard value p.u and V p.u A comparison is made, and the result of the comparison is input into the virtual inertia governing equation (6) or (7). The virtual inertia control (6) or (7) obtains the active reference command through the limiting link.

[0052] Step 3, on the other hand, use the collected DC voltage and AC frequency to determine whether the voltage and frequency are in the dead zone through the dead zone judgment formulas (10) and (11). When the D...

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Abstract

The invention relates to the technical field of control of AC / DC bus interface converters, in particular to an AC / DC bus interface converter control strategy based on virtual inertia. A DC subnet and an AC subnet are connected with each other through an AC / DC bus current bus interface converter, and the DC subnet and the AC subnet internally comprise corresponding distributed power supplies and loads respectively. The distributed power supply in the DC subnet adopts a virtual synchronous generator control strategy to equally share the load and stabilize the DC voltage fluctuation, the distributed power supply in the AC subnet adopts droop control to equally share the load, and the AC / DC bus interface converter adopts a traditional three-phase voltage source type converter. And the AC / DC bus interface converter performs strategy control according to a formula in the operation process.

Description

technical field [0001] The invention relates to the technical field of control of AC-DC bus interface converters, in particular to a control strategy for AC-DC bus interface converters based on virtual inertia. Background technique [0002] At present, the hybrid microgrid can meet the needs of various loads, and has been considered by many scholars to be the mainstream form of the future smart grid. Therefore, it is of great significance to study the operation control strategy of the AC-DC hybrid microgrid to maintain the stability of the bus voltage and frequency, realize the bidirectional power flow, and improve the stability of the system. The traditional control method of the AC-DC bus interface converter is initially designed based on droop control. However, although the droop control has fast response speed and large voltage and frequency overshoot, it also has shortcomings such as slow steady-state recovery process. Therefore, some scholars subsequently applied the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J5/00H02J1/02H02J3/00
CPCH02J5/00H02J1/02H02J3/007H02J2203/10
Inventor 孟润泉韩肖清张定邦张昊
Owner TAIYUAN UNIV OF TECH