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A new energy unit high voltage ride through method and system

A high-voltage, new energy technology, applied in flexible AC transmission systems, wind power generation, electrical components, etc., can solve problems such as threats to the safe and stable operation of new energy systems, and achieve the effect of simple design, easy engineering implementation, and improved operating value.

Active Publication Date: 2021-09-28
STATE GRID ECONOMIC TECH RES INST CO +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing design of new energy units cannot meet the high voltage ride-through under such faults. If such overvoltage is not controlled, it will directly threaten the safe and stable operation of the new energy system.

Method used

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  • A new energy unit high voltage ride through method and system
  • A new energy unit high voltage ride through method and system
  • A new energy unit high voltage ride through method and system

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Embodiment Construction

[0040] The present invention provides a high-voltage ride-through method for new energy units. The method is connected to a direct-drive wind farm-SVG of a high-voltage direct current transmission system (line commutated converter high voltage direct current, LCC-HVDC) based on a grid commutation converter. The coordinated high-voltage ride-through method will be described below in detail by taking a direct-driven fan (permanent magnetsynchronous generator, PMSG) as an example, with reference to the accompanying drawings and embodiments.

[0041] Such as figure 1 Shown, the present invention comprises the following steps:

[0042] 1) Real-time detection of wind farm point of common coupling (Point of Common Coupling, PCC) voltage U s , according to the voltage and the operating voltage value of the DC side capacitor of the wind turbine converter, the high voltage fault criterion λ is calculated.

[0043] Such as figure 2 As shown, the calculation method of the overvoltage ...

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Abstract

The invention relates to a method and system for high-voltage ride-through of a new energy unit, which includes: real-time detection of the grid-connected point voltage of a wind farm, and calculation of an overvoltage criterion based on the voltage and the operating voltage value of the DC side capacitor of the wind turbine converter; The relationship between the field grid-connected point voltage and the overvoltage criterion determines the operation mode of the wind turbine, and realizes the high voltage ride-through of the wind turbine during the wide-range overvoltage of the power grid according to the operation mode of the wind turbine. The invention can automatically switch the control mode according to the different depths of the overvoltage, and automatically select whether to put into operation the centralized SVG, so as to realize the high voltage ride-through of the wind turbine during the wide-range overvoltage period of the power grid, so as to meet the increasingly strict wind power grid-connected guideline. Then there are requirements for the high-voltage ride-through capability of the unit.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a high-voltage ride-through method and system for a new energy unit. Background technique [0002] Wind power, photovoltaic and other renewable energy power generation are widely used as the most promising power generation methods for large-scale development and application. The fault ride-through capability of new energy units is crucial to the safe and stable operation of the power grid. The current research on low voltage ride through (LVRT) technology for new energy units is becoming more and more mature, and many new energy stations already have low voltage ride through. All countries have introduced relatively complete low-voltage ride-through specifications for new energy units. However, the current high voltage ride through (high voltage ride through, HVRT) specifications for new energy generators in various countries are not complete, and it is of great si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/18
CPCH02J3/18H02J3/381H02J2300/28Y02E10/76Y02E40/10
Inventor 邹欣李晖耿华赵晟凯李俊霖傅诗琪盖振宇
Owner STATE GRID ECONOMIC TECH RES INST CO
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