Novel control method of double-feed wind-driven generator converter

A control method, bidirectional converter technology, applied in the direction of motor generator control, electronic commutation motor control, control generator, etc., can solve the problems of increasing system cost and algorithm complexity, and achieve the effect of high dynamic characteristics

Active Publication Date: 2011-04-13
邵诗逸 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

An accurate flux linkage estimator needs to collect stator voltage and current at the same time, and accurately estimate the stator resistance value under the premise of considering temperature changes, which increases the cost and algorithm complexity of the system

Method used

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  • Novel control method of double-feed wind-driven generator converter
  • Novel control method of double-feed wind-driven generator converter
  • Novel control method of double-feed wind-driven generator converter

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Embodiment Construction

[0056] Preferred embodiments of the present invention are described in detail as follows in conjunction with accompanying drawings:

[0057] figure 1 is the system block diagram. The whole converter can be divided into 5 modules, namely:

[0058] 1. The grid-side converter (11) adopts a sliding mode control method to control the active and reactive power input to the grid;

[0059] 2. The converter (8) on the motor side adopts a vector control algorithm based on the grid voltage synchronous coordinate system to control the speed of the doubly-fed wind generator and the reactive power input to the grid at the stator side;

[0060] 3. LCL filter, connected between the grid-side converter and the grid, improves the waveform and quality of the input grid;

[0061] 4. The dv / dt filter is connected between the motor side converter and the rotor winding of the motor to eliminate high-order harmonics and protect the motor;

[0062] 5. The DC link is connected between the grid-side...

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Abstract

The invention discloses control methods of a two-way converter system connected with an electric network, which comprise a control method of an electric network side converter and a control method of an electric motor side converter. The electric network side converter adopts novel sliding mode control to realize effective control on electric network side control variables including IS, Id and Um. The method plays a full inhibitory action on resonance phenomena of a capacitor loop of a wave filter in a system while ensuring the normal output power of the electric network side converter. The control method of the electric motor side converter cancels a magnetic flux linkage estimator used in the conventional vector control, but adopts a novel electric network voltage-based synchronous coordinate system, and adopts two independent control loops to realize decoupling control on the double-feed electric motor side reactive power Qs and the electric motor rotating speed omega r.

Description

Technical field: [0001] The invention relates to a control method for a bidirectional converter system connected to a power grid and applied to a doubly-fed wind power generator. Among them, the grid-side converter adopts a new sliding mode control (Sliding mode control) to increase the reliability of the system, while the motor-side converter adopts a new vector control algorithm based on grid synchronous coordinate axes, which reduces the complexity of the system. Background technique: [0002] The basic hardware topology of a converter applied to a doubly-fed wind turbine is as follows: figure 1 As shown, it is mainly composed of grid-side converter (including grid-side LCL filter), motor-side converter (including motor-side dv / dt filter) and DC link. The control of the converter includes the control of the grid-side converter and the control of the motor-side converter. [0003] The control purpose of the grid-side converter is to effectively transmit and output the ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/01H02P21/00H02P21/20
CPCY02E40/40
Inventor 邵诗逸乌云翔
Owner 邵诗逸
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