A lyapunov coordinated control method using dfig of pgsc and sgsc

A coordinated control and converter technology, applied in harmonic reduction devices, wind power generation, and AC networks to reduce harmonics/ripples, etc., can solve problems such as slow response speed, weak robustness, and difficult control, and achieve Responsive, robust, and easy-to-control effects

Active Publication Date: 2022-04-01
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing doubly-fed asynchronous motor has a slow response speed due to the difficult control of the stator voltage, and the robustness is not strong

Method used

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  • A lyapunov coordinated control method using dfig of pgsc and sgsc
  • A lyapunov coordinated control method using dfig of pgsc and sgsc
  • A lyapunov coordinated control method using dfig of pgsc and sgsc

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Embodiment

[0095] figure 1 It is the topological structure diagram of the DFIG system using SGSC. Compared with the classic doubly-fed fan system, the system topology has an extra series transformer and a series grid-side converter (series GSC, SGSC) on the fan stator side. The secondary of the series transformer is connected in series between the wind turbine stator and the grid, the input terminal of the series grid-side converter SGSC is connected to the input terminal of the parallel GSC (PGSC) converter, and the output terminal of the series grid-side converter SGSC is connected to the series transformer through an inductor L In the primary stage, the added SGSC can not only inject an appropriate series compensation voltage through the stator circuit to offset the negative sequence voltage of the stator, but also control it to inject a positive sequence compensation voltage vector into the stator circuit to eliminate the impact of the series transformer leakage impedance voltage dro...

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Abstract

The invention relates to a Lyapunov coordinated control method of DFIG using PGSC and SGSC. The method adds a series transformer and a SGSC on the DFIG stator side, the series transformer secondary is connected in series between the DFIG stator and the grid, and the input terminal of the SGSC is connected to the PGSC input The SGSC output terminal is connected to the primary of the series transformer through the inductor L. The SGSC adopts Lyapunov control, which can use the harmonics generated by the SGSC to offset the double-frequency harmonics of the PGSC. The stator voltage is easy to control, so as to achieve twice the total output power of the system. The suppression of frequency fluctuations reduces the impact of unbalanced grid voltage on the RSC system and improves the RSC system's ability to ride through unbalanced grid voltage to achieve global stability of the system. Compared with the prior art, the invention has the advantages of fast response speed, strong robustness, less control parameters and the like. Compared with the prior art, the present invention has advantages such as.

Description

technical field [0001] The invention relates to a distributed power generation control technology, in particular to a Lyapunov coordinated control method using DFIG of PGSC and SGSC. Background technique [0002] With the increasing impact of wind turbines on the stability of the power system, it is particularly important to ensure that the wind turbines do not run off-grid when the grid voltage is unbalanced. Among many wind power generators, Doubly Fed Induction Generator (DFIG) is widely used because of its relatively low cost. The rotor of DFIG adopts two PWM converters, namely the rotor side converter (Rotor-Side Converter, RSC) and grid side converter (Grid-Side Converter, GSC). Since the two converters are connected through the intermediate DC bus and large capacitors, the independent decoupling control of the grid side can be realized through the grid-side converter, the control target can be obtained, and the control quality can be improved. The existing doubly-fe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/26H02J3/01H02J3/38
CPCH02J3/386H02J3/01H02J3/26Y02E10/76Y02E40/40Y02E40/50
Inventor 程启明程尹曼陈路孙伟莎李涛
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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