Low-voltage ride-through control method for hydraulic wind generating set

A technology for wind turbines and low-voltage ride-through, which is applied in the field of wind power generation, and can solve problems such as energy distribution scheme elaboration, and achieve the effects of ensuring rapidity and reliability, speeding up response, and avoiding limitations

Inactive Publication Date: 2014-05-07
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has two control variables, the variable motor swing angle and the flow control valve, and the control is more flexible, but it does not elaborate on the coordinated control method and energy distribution scheme of the two control variables in the control process

Method used

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  • Low-voltage ride-through control method for hydraulic wind generating set
  • Low-voltage ride-through control method for hydraulic wind generating set
  • Low-voltage ride-through control method for hydraulic wind generating set

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0031] A low-voltage ride-through control method for a hydraulic wind power generating set. The hydraulic system for realizing the control method is as follows: figure 1As shown, its hardware configuration includes wind wheel 1, first rotational speed torque sensor 2, quantitative pump 3, high pressure pipeline 4, first check valve 5, first pressure sensor 6, proportional throttle valve 7, second pressure Sensor 8, flow sensor 9, safety valve 10, variable motor 11, second speed torque sensor 12, generator 13, multi-function instrument 14, power grid 15, charge pump 16, overflow valve 17, fuel tank 18, second unit Directional valve 19, low-pressure pipeline 20, wind speed sensor 21, power controller 22, speed controller 23;

[0032] The wind wheel 1 is directly connected coaxially with the quantitative pump 3, and the first speed torque sensor 2 is arranged on the con...

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Abstract

The invention relates to a low-voltage ride-through control method for a hydraulic wind generating set. When the voltage of a power grid drops, a rotating controller realizes variable-displacement-motor tilt angle control so as to make high-voltage pressure of a hydraulic system drop rapidly so that the rotation speed of a metering pump is increased and thus remaining power is stored in a wind wheel. When energy storage quantity of the wind wheel reaches a set value, a power controller controls opening of a proportional throttle valve and converts redundant energy of the system into heat energy. Controllable variants in the system include control signals of the proportional throttle valve and control signals of a swash-plate tilt angle of the variable displacement motor. The low-voltage ride-through control method for the hydraulic wind generating set adopts a double-variant control strategy and a control system has two controlled variants which are controlled in a coordinated manner; a coordinated control method for the two controlled variants and an energy distribution scheme are proposed; a proportional throttle unit is added so as to speed up responses of the whole system; and at the same time, the system has more than one controllable parameter so that control is more flexible.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, relates to the main transmission system of a hydraulic wind power generator, uses hydraulic transmission equipment and a hydraulic control system to replace the traditional gearbox transmission system and direct drive transmission system, and particularly relates to a hydraulic wind power generator set Low voltage ride through control method. Background technique [0002] Wind energy resources are clean and renewable energy sources that do not consume any fuel, nor produce carbon dioxide, and do not pollute the environment. Wind power generation is one of the power generation methods with the most mature new energy technology, the most large-scale development conditions and great commercial development prospects. Many countries in the world, especially developed countries, have realized the importance of wind power in adjusting energy structure and mitigating environmental pollutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
Inventor 孔祥东艾超闫桂山宋豫
Owner YANSHAN UNIV
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