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Device and method for low voltage ride through of double-fed inductive wind power generator system

A technology of wind power generator and low voltage ride through, which is applied in the direction of wind power generation, generator control, control system, etc., to achieve the effect of suppressing impact, reducing transient impact, and assisting safety, stability and recovery

Inactive Publication Date: 2011-10-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The influence of the crowbar resistance is very important in the process of low voltage ride through, but there is no suitable method for determining the crowbar resistance in the literature

Method used

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  • Device and method for low voltage ride through of double-fed inductive wind power generator system
  • Device and method for low voltage ride through of double-fed inductive wind power generator system
  • Device and method for low voltage ride through of double-fed inductive wind power generator system

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Embodiment

[0089] The control effect analysis of the present invention is carried out with the research of a 1.5MW commercial doubly-fed induction wind power generator below. The rated voltage of the motor stator is 690V, and the rated DC bus voltage is 1050V. Before the grid failure, DFIG operates at rated power, the speed is 1800 rpm (1.2pu), the active power generated by the stator is 0.84pu (at this time, the total active power generated by the system is 1pu), and the reactive power generated is 0. When running to 0.3s, the grid voltage drops to 15% sharply and lasts for 300ms.

[0090] Depend on Figure 4-Figure 10 It can be seen that by adopting the low voltage ride-through method of the present invention, the peak value of the stator and rotor current can be controlled within the range of twice the rated peak current, and the electromagnetic torque ripple is small, and the DC bus voltage fluctuation is small, within the safe range. And it can quickly restore the given value, whi...

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Abstract

The invention discloses a device and method for low voltage ride through of a double-fed inductive wind power generator system. In the invention, the advantages of using a high-resistance resistor and a low-resistance resistor are effectively combined through the real-time regulation of the equivalent resistance of a crowbar resistor; under the condition of small voltage fluctuation of a direct-current bus, the shock of rotor current is better inhibited, and the rotor current is quickly attenuated to a safe range, so that a rotor excitation converter is effectively protected and the transient-state shock to an electrical network and a mechanical system is reduced; meanwhile, security, stability and recovery of the voltage of the electrical network are effectively aided through the cooperative reactive power compensation of a rotor side converter and a network side converter during the voltage dip of the electrical network.

Description

technical field [0001] This patent belongs to the technical field of new energy power generation, and in particular relates to a low-voltage ride-through device and method for a doubly-fed induction wind power generator system. Background technique [0002] With the continuous expansion of my country's wind power market, the proportion of wind power in the power system has been increasing year by year, and its impact on the power grid can no longer be ignored. Therefore, countries around the world have put forward requirements for wind power generation systems to have low voltage ride-through capability, that is, within a certain range of grid voltage drop, wind turbines must remain connected to the grid, and must be able to provide a certain amount of reactive power (voltage voltage) to the grid. )support. Doubly-Fed Induction Generator (DFIG for short) is widely used in wind power generation systems due to its advantages of small inverter capacity and decoupling control o...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/18H02P9/10
CPCY02E10/76Y02E40/30
Inventor 任远章玮
Owner ZHEJIANG UNIV
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