Overload protection method and device, control method and device and wind power converter

An overload protection, overload current technology, applied in emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, measurement devices, etc., can solve the overload protection and overload protection detection logic of power electronic devices that cannot be powered imperfections, etc.

Active Publication Date: 2020-10-30
维谛新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current method used for overload protection cannot effectively protect power electronic devices from overload because the detection logic corresponding to overload protection is not perfect.

Method used

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  • Overload protection method and device, control method and device and wind power converter
  • Overload protection method and device, control method and device and wind power converter
  • Overload protection method and device, control method and device and wind power converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0137] See Figure 12 , is a schematic structural diagram of a grid-side module provided by an embodiment of the present disclosure. Taking a 2.1MW double-fed wind power converter grid-side power module as an example, the grid-side power module includes a three-winding transformer 121, a main switch 122, The main contactor 123, the generator 124, the LCL filter 125, the power device under test 126 at the grid side, the power device under test 127 at the rotor side and the control device 128, the main switch 122 and the main contactor 123 are connected in series to the three The winding transformer 121 and the generator 124; the LCL filter 125, the power device under test 126 at the grid side and the power device under test 127 at the rotor side are connected in series to the three-winding transformer 121 and the generator 124; The control device 128 is connected with the grid side power device under test 126 and the rotor side power device under test 127 . The wind power conv...

Embodiment 2

[0158] Step a1: The grid-side module collects the instantaneous current value of the power device under test according to the set frequency through the collector. The current frequency is 50Hz, and the set frequency is 3000Hz.

[0159] Step a2: The effective value calculator calculates the number of sampling points in each current cycle according to the frequency of the current and the set frequency when the instantaneous value is collected, and calculates the effective value of the current. Here, 60 points are collected in each current cycle, and the square root of the sum of the squares of these 60 points is calculated to obtain the effective value of the grid-side module current.

[0160] Step a3: Determine whether the effective value of the current is greater than the upper limit of the overload current 450A, if yes, execute step a4; if not, execute a5.

[0161] Step a4: The current limiting regulator adjusts the current setting to an overload current threshold value of 4...

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PUM

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Abstract

The embodiment of the invention discloses an overload protection method. The method comprises the steps of obtaining a current effective value of a to-be-tested power device; determining overload points according to the relationship between the current effective value and an overload current threshold value, and determining the number of the overload points in the current overload time period according to attribute parameters corresponding to the overload points; and adjusting the given current of the to-be-tested power device based on the relationship between the number of the overload pointsin the current overload time period and a set threshold. The embodiment of the invention further discloses a control method and device with high overload protection capability and a wind power converter. In the embodiment of the invention, whether the to-be-tested power device is overloaded in the current overload time period or not can be accurately known, the given current of the to-be-tested power device is adjusted according to the overload condition, and overload protection can be accurately carried out on the to-be-tested power device, so that the overload protection capability of the power device is effectively improved.

Description

technical field [0001] Embodiments of the present disclosure relate to the field of overload protection, and in particular to an overload protection method and device, a power device control method and device, and a wind power converter. Background technique [0002] Power electronic devices have the characteristics of controllability, high power, and high voltage, and are widely used in industrial and civil fields, such as wind power generation, solar power generation, steel rolling mills, paper machines, elevators, inverter air conditioners, washing machines, etc. IGBT is a representative of power electronic devices. The withstand voltage of a single IGBT can reach more than 1000V, and the withstand current can reach more than 300A. Power electronic devices work under the condition of high voltage and high current, turn on and off through the driving circuit, and perform power conversion. Power devices will generate conduction loss during the conduction process and switch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/02G01R19/165G01R31/26
CPCH02H9/02G01R31/2608G01R19/16519
Inventor 雷博
Owner 维谛新能源有限公司
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