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Integrated low-voltage ride through regulation and control device of wind power generation

A low-voltage ride-through and control device technology, applied in wind power generation, single-network parallel feeding arrangement, etc., can solve problems such as disconnection and serious faults

Inactive Publication Date: 2015-08-12
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the continuous expansion of wind power generation scale, if the wind turbines still adopt passive protection off-grid when the voltage drops, it will increase the difficulty of the recovery of the entire system, and even make the fault more serious, eventually leading to the disconnection of all other units in the system

Method used

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  • Integrated low-voltage ride through regulation and control device of wind power generation
  • Integrated low-voltage ride through regulation and control device of wind power generation
  • Integrated low-voltage ride through regulation and control device of wind power generation

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Embodiment Construction

[0054] A low-voltage ride-through comprehensive control device for wind power generation. The main working module of the low-voltage ride-through system of a wind turbine includes three parts: a power grid, a low-voltage ride-through comprehensive control device, and a wind turbine. The DC energy supply device is connected to the DC side of the inverter and the energy consumption resistor module to provide stable DC voltage for both.

[0055] When the low voltage ride through system detects a voltage drop fault in the power grid, the comprehensive control device will be put into use immediately. The inverter obtains a stable DC voltage from the DC energy storage device, generates a compensation voltage through inversion, and then connects it to the system in series through a filter. The compensation voltage is added to the voltage after the drop of the original power grid, which is equal to the voltage during normal operation of the power grid, so that the fan end can maintain...

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Abstract

Provided is an integrated low-voltage ride through regulation and control device of wind power generation. The integrated regulation and control device is used immediately that a voltage sag fault is detected in a low-voltage ride through system. An inverter obtains stable DC voltage from a DC energy storage device, a compensation voltage is generated by inversion, and the compensation voltage is connected in series to the system via a filter. The sum of the compensation voltage and the voltage after sag of the electrical network equals the voltage when the electrical network works normally, so that a generator end is kept in normal operation; and at the same time, a fixed capacitor implements reactive compensation, and an energy-consuming resistor consumes active power emitted by the generator end when the voltage is reduced transiently.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a low-voltage ride-through comprehensive control device for wind power generation. Background technique [0002] When the grid voltage drops, the power injected into the grid by the grid-side inverter decreases due to the limitation of the converter's current flow capacity. At this moment, the power of the machine-side rectifier has not changed, causing an overvoltage on the DC side. If the DC side voltage is kept stable, it will inevitably cause overcurrent of the inverter. Both overvoltage and overcurrent will cause damage to power electronic devices. In order to protect the converter from damage, the wind turbine will stop running when the voltage drops. When the penetration rate of the grid is small, it is still acceptable for the wind turbine to stop running when the voltage drops. However, with the continuous expansion of wind power generation scale, if the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/76
Inventor 杨德昌耿光飞
Owner CHINA AGRI UNIV
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