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DSP-based low-voltage ride-through area general judgment method

A low-voltage ride-through and area technology, applied in photovoltaic power generation, wind power generation, electrical components, etc., can solve the problems of increasing the difficulty of judging low-voltage ride-through areas, different and complex low-voltage ride-through times, and achieve self-adaptive adjustment capabilities Strong, versatile, and easy to transplant

Inactive Publication Date: 2017-10-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For different degrees of voltage drop, the time of low voltage ride-through is different, how to accurately and effectively judge this area is very complicated
In addition, there are differences in low-voltage ride-through areas stipulated by different grid-connected standards, which increases the difficulty of judging low-voltage ride-through areas

Method used

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  • DSP-based low-voltage ride-through area general judgment method
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  • DSP-based low-voltage ride-through area general judgment method

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Embodiment Construction

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0020] Although the standards of various countries have not yet unified the regulations on low-voltage ride-through areas, their basic shapes are figure 1 and figure 2 Both are shown. in, figure 1 The LVRT region shown contains zero voltage and is more stringent, while figure 2 The low voltage ride-through region shown does not include zero voltage sections. exist figure 1 and figure 2 In , the abscissa is time, and the ordinate is the per-unit value u of the grid-connected point voltage, and the rated voltage is used for per-unit conversion. That is, when the grid-connected point voltage is equal to the rated voltage, its value is u=1. When u0.9, wi...

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Abstract

The invention discloses a DSP-based low-voltage ride-through area general judgment method. The method is characterized by, in the DSP initialization program, setting the shape of a low-voltage ride-through area, judgment of the low-voltage ride-through area being executed in a DSP timer interrupt function; defining a time counting variable and assigning an initial value to the time counting variable; when executing the interrupt function every time, measuring a grid-connection point voltage per-unit value, and calculating time decreasing step length according to the low-voltage ride-through area shape regulated in grid-connection standard; and subtracting the time counting variable by the time decreasing step length to judge whether the system is inside or outside the low-voltage ride-through area, and furthermore, carrying out corresponding control strategies. The method can judge the low-voltage ride-through area through a time counting variable decreasing method, and the time decreasing step length changes with the degree of voltage drop; and the judgment method is high in universality, is suitable for requirements for the low-voltage ride-through area of different grid-connection standards, and can provide convenience for low-voltage ride-through control.

Description

technical field [0001] The invention relates to the field of new energy grid-connected power generation, and specifically refers to a general judgment method for a low-voltage ride-through area implemented in a digital signal processor (DSP). Background technique [0002] In large-scale photovoltaic and wind power plants, grid-connected standards strictly require that they have low-voltage ride-through functions. Low voltage ride through means that when the grid failure or disturbance causes the voltage drop at the grid connection point, within a certain voltage drop range and time interval, the photovoltaic inverter or wind turbine can run continuously without interruption. For large-scale photovoltaic or wind power plants, it is also required to be able to output reactive power during grid voltage drops to support the rapid recovery of grid voltage. And when the grid-connected point voltage exceeds the specified drop range and time interval, the photovoltaic inverter and ...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCH02J3/383H02J3/386Y02E10/56Y02E10/76
Inventor 严庆增赵仁德何金奎赵斌蒋先强李广琛
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)