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Lyapunov synergic control method of doubly fed induction generator (DFIG) employing parallel grid-side converter (PGSC) and series grid-side converter (SGSC)

A technology of coordinated control and control objectives, applied in wind power generation, AC network circuits, electrical components, etc., can solve problems such as difficult control, weak robustness, and slow response speed.

Active Publication Date: 2018-11-30
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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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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  • Lyapunov synergic control method of doubly fed induction generator (DFIG) employing parallel grid-side converter (PGSC) and series grid-side converter (SGSC)
  • Lyapunov synergic control method of doubly fed induction generator (DFIG) employing parallel grid-side converter (PGSC) and series grid-side converter (SGSC)
  • Lyapunov synergic control method of doubly fed induction generator (DFIG) employing parallel grid-side converter (PGSC) and series grid-side converter (SGSC)

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Embodiment

[0092] 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 synergic control method of a doubly fed induction generator (DFIG) employing a parallel grid-side converter (PGSC) and a series grid-side converter (SGSC). According to the method, a series transformer and the SGSC are additionally arranged at a stator side of the DFIG, a secondary side of the series transformer is connected in series between the stator of the DFIG and a power grid, an input end of the SGSC is connected with an input end of the PGSC, an output end of the SGSC is connected in series with a primary side of the series transformer by an inductorL, the SGSC employs Lyapunov-based control, doubled frequency harmonic of the PGSC can be offset by harmonic generated by the SGSC, the stator voltage is easy to control, so that the suppression of doubled frequency fluctuation of total output power of the system is achieved, the influence of an unbalanced power grid voltage on a rotor-side converter (RSC) system is reduced, the ride-through running capability of the RSC system on the unbalanced power grid voltage is improved, and meanwhile, the global stability of the system is achieved. Compared with the prior art, the Lyapunov synergic control method has the advantages of rapid response speed, high robustness, a few control parameters and the like. Compared with the prior art, the Lyapunov synergic control method has the advantages.

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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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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