VSG pre-synchronization control method based on virtual current and grid connection method thereof

A technology of virtual current and control method, applied in the direction of single-grid parallel feeding arrangement, reducing/preventing power oscillation, etc., can solve problems such as failure to increase synchronization, unstable VSG frequency, unable to complete phase angle synchronization, etc., and achieve high reliability. , Improve frequency stability, good practicability

Active Publication Date: 2022-04-12
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology improves synchronizing between different power sources (VS) without affecting their overall performance or causing damage over time due to changes caused by external factors like temperature fluctuations. It ensures that all devices are working correctly even if they don't work properly at once.

Problems solved by technology

This patents discusses how current methods for connecting generators to grids suffer from various technical drawbacks including lack of sufficient stabilizing controls during operation under varying environmental conditions like temperature fluctuations, unstable network connections caused by changes in impedance levels, potential safety hazards associated with high voltages and low resistance ground lines, and difficulty in achieving proper synchronism when transitioning into isolated mode without causing sudden oscillating events.

Method used

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  • VSG pre-synchronization control method based on virtual current and grid connection method thereof
  • VSG pre-synchronization control method based on virtual current and grid connection method thereof
  • VSG pre-synchronization control method based on virtual current and grid connection method thereof

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Embodiment Construction

[0055] like image 3 Shown is the method flow diagram of the pre-synchronization control method of the present invention, and the corresponding control strategy schematic diagram of the pre-synchronization control method of the present invention is as follows Figure 4 Shown: this virtual current-based VSG pre-synchronization control method provided by the present invention includes the following steps:

[0056] S1. Obtain the real-time voltage values ​​of the VSG output terminal and the HDG-MG output terminal;

[0057] S2. Construct the virtual resistance connecting VSG and HDG-MG and set the impedance, so as to calculate the virtual current value between VSG and HDG-MG; specifically include the following steps:

[0058] A. Construct a virtual resistance Z connecting VSG and HDG-MG V , and set the impedance value as a pure resistance value R V ;

[0059] B. Use the following formula to calculate the virtual current value between VSG and HDG-MG

[0060]

[0061] In the

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Abstract

The invention discloses a VSG pre-synchronization control method based on virtual current. The method comprises the following steps: acquiring real-time voltage values of the output ends of a VSG and an HDG-MG; constructing a virtual resistor connecting the VSG and the HDG-MG, and setting impedance to calculate a virtual current value between the VSG and the HDG-MG; converting the virtual current value to obtain a d-axis current and a q-axis current; and the VSG pre-synchronization amplitude control quantity and the VSG pre-synchronization phase control quantity are calculated, and VSG pre-synchronization control based on the virtual current is completed. The invention further discloses a grid connection method comprising the VSG pre-synchronization control method based on the virtual current. Through the innovative control loop design, VSG pre-synchronization control and corresponding VSG grid connection are achieved, the method can guarantee stable system frequency change, the frequency stability of the VSG in the pre-synchronization process is improved, the reliability is higher, and the practicability is better.

Description

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Claims

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Application Information

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Owner HUNAN UNIV OF TECH
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