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Virtual synchronization grid-connected control method and system based on dual stator-winding induction generator set

A dual-winding, virtual synchronization technology for the stator, applied in wind power generation, electrical components, circuit devices, etc., can solve problems such as difficult to achieve smooth switching, and achieve the effects of simple and efficient control algorithm, suppression of current deviation, and stable operation

Active Publication Date: 2017-06-13
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the traditional generator grid-connected control strategy, the microgrid inverter usually uses P / Q control during grid-connected operation, and V / F control during island operation, but this method is difficult to achieve smooth switching between different operating modes

Method used

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  • Virtual synchronization grid-connected control method and system based on dual stator-winding induction generator set
  • Virtual synchronization grid-connected control method and system based on dual stator-winding induction generator set
  • Virtual synchronization grid-connected control method and system based on dual stator-winding induction generator set

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Embodiment 1

[0043] Embodiment 1. A virtual synchronous grid-connected control system for asynchronous wind turbines based on stator double windings. Combine below Figure 1 to Figure 4 The system provided in this embodiment will be described in detail.

[0044] see Figure 1 to Figure 4 , based on a virtual synchronous grid-connected control system for a stator double-winding asynchronous wind turbine, the system includes a stator double-winding asynchronous wind turbine and a virtual synchronous control device, and the stator double-winding asynchronous wind turbine is electrically connected to the virtual synchronous control device; The stator double-winding asynchronous wind turbine is used to transmit power to the virtual synchronous control device.

[0045] Specifically, the virtual synchronization grid-connected control system based on the stator double-winding asynchronous wind turbine includes a stator double-winding induction motor (1), a filter inductor (2), a control-side inv...

Embodiment 2

[0049] Embodiment 2. A virtual synchronous grid-connected control method for asynchronous wind turbines based on stator double windings. Combine below Figure 1 to Figure 4 The method provided in this embodiment will be described in detail.

[0050] see Figure 1 to Figure 4 , based on the virtual synchronization grid-connected control method of the stator double-winding asynchronous wind turbine, the stator double-winding asynchronous wind turbine is used to transmit power to the virtual synchronous control device; the current hysteresis control algorithm of the voltage outer loop is used to control the stator double-winding asynchronous wind turbine. The above-mentioned virtual synchronous control device adopts a grid-connected control strategy based on virtual synchronization to realize grid-connection.

[0051] The stator of the stator double-winding asynchronous wind turbine includes a control winding and a power winding; the power winding is connected to an uncontrolle...

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Abstract

The present invention discloses a virtual synchronization grid-connected control method and system based on a dual stator-winding induction generator set. The generator employed by the dual stator-winding induction generator set is a dual stator-winding induction generator, control winding on the stator is connected with an inverter at a control side so as to realize effective control of the whole generator set, and power winding on the stator is connected with an uncontrolled rectifier bridge to transmit power to a direct current bus. The grid-connected control method of the dual stator-winding induction generator set employs a virtual synchronization grid-connected control method, in the microgrid inverter control method based on a virtual synchronous generator, a quasi-synchronization paralleling algorithm is added to perform presynchronization of a control algorithm, based on the virtual impedance algorithm of a second-order generalized integrator, and the space voltage vector modulation method based on a quasi-proportional resonance algorithm is employed. The virtual synchronization grid-connected control method and system based on the dual stator-winding induction generator set can realize effective and stable operation of the whole dual stator-winding induction generator set and can automatically select grid connection opportunity to allow the grid connection moment not to have impact current so as to realize effective and flexible grid connection.

Description

technical field [0001] The invention relates to a grid-connected control method of a distributed micro-grid system, in particular to a virtual synchronization grid-connected control method and system based on stator double-winding asynchronous wind turbines. Background technique [0002] The Stator-Winding Induction Generator (Dual Stator-Winding Induction Generator, referred to as DWIG) adopts a brushless structure, which is simple and firm in structure, without brushes and slip rings; two sets of windings are arranged on the stator, one is a power winding, and the output terminal is connected to There are excitation capacitors, rectifiers, filter capacitors, and output DC voltage; the other set is the control winding, which is connected to a static excitation converter. The capacity of this excitation converter is only about 1 / 3 of the system capacity, and the converter provides the system. The reactive current of the power winding can be effectively controlled by using a ...

Claims

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Application Information

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IPC IPC(8): H02J3/44H02J3/38
CPCH02J3/386H02J3/44Y02E10/76
Inventor 施凯叶海涵徐培凤焦龙孙宇新
Owner JIANGSU UNIV
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