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Current control method suitable for high phase-locked loop bandwidth

A current control, phase loop technology, applied in electrical components, output power conversion devices, AC power input into DC power output and other directions, can solve the problems of complex phase-locked loop small signal modeling, to avoid interactive resonance Effect

Active Publication Date: 2018-09-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phase detection in PLLs is implemented by the Park transform (dq), which is highly nonlinear and time-varying, making small-signal modeling of PLLs very complex

Method used

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  • Current control method suitable for high phase-locked loop bandwidth
  • Current control method suitable for high phase-locked loop bandwidth
  • Current control method suitable for high phase-locked loop bandwidth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0033] figure 1 It is a three-phase L-type grid-connected inverter main circuit and its control structure diagram.

[0034] In this example, if figure 1 As shown, the three-phase L-type grid-connected inverter includes a main circuit, a control module and a modulation module. The main circuit part is composed of inverter main circuit 1, L filter 2 and power grid 3. The inverter main circuit 1 is connected to the power grid 3 through an L-shaped filter 2, L g and C g Simulate grid impedance. The main circuit parameters are shown in Table 1:

[0035] Table 1 is the main circuit parameter table;

[0036] symbol

name

value

V dc

DC side voltage

300V

V g

Grid phase voltage peak value

110V

I refd

d-axis reference current

5A

I refq

q-axis reference current

0

f s

Control and Sampling Frequency

10KHz

f sw

On-off level

10KHz

f c

Grid fundamental frequency

50Hz

...

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PUM

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Abstract

The invention discloses a current control method suitable for a high phase-locked loop bandwidth. A suitable compensation coefficient K is selected by giving separate consideration to the influence from the phase-locked loop to a modulation voltage; and an axis offset deltaVq of a power grid voltage q is adjusted by adopting the selectee compensation efficient K to counteract the influence form the phase-locked loop to the modulation voltage. Accordingly, interactive resonance oscillation between the power grid and an inverter caused by increase of the phase-locked loop bandwidth is avoided, the current inner loop control in a dq coordinate system still can keep stable when the phase-locked loop bandwidth reaches to several hundred hertz, and the robustness of the inverter to the phase-locked loop bandwidth change is further improved.

Description

technical field [0001] The invention belongs to the technical field of three-phase grid-connected inverters, and more specifically relates to a current control method suitable for high phase-locked loop bandwidth. Background technique [0002] With the increase of renewable power (wind power, photovoltaic) grid-connected power level and wide distribution location, the scale and distance of power transmission continue to grow, and the power grid gradually shows insufficient anti-disturbance capability. In recent years, the problem of mutual resonance between renewable energy converters and power grids has emerged in China, the United States and Europe. The stability of a system containing multiple grid-connected inverters is often difficult to analyze, especially when the inverters have different voltage levels and dynamic characteristics. [0003] In order to solve the stability challenge caused by the mutual resonance between the converter and the grid, the stability analy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02M7/5387
CPCH02J3/38H02M7/5387
Inventor 李凯彭颖郑宏谢川邹见效徐红兵
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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