SVG device-based method for improving low voltage ride through capability of wind farm

Abstract

The invention relates to an SVG device-based method for improving the low voltage ride through capability of a wind farm. A static dynamic reactive power compensation device SVG is connected to an outgoing line side of a new energy power station in parallel; and the static dynamic reactive power compensation device SVG dynamically adjusts reactive power output of the tail end in real time according to the control mode issued by a system dispatcher and the monitored operating condition in the power station and compensates reactive power of line transmission and reactive power loss of a main transformer in the power station. By the SVG device-based method, the operating performance of a power grid system can be improved; and the plant factor of the wind farm is improved.

Description

technical field [0001] The invention relates to the field of power generation utilization of wind farms, in particular to a method for improving the low-voltage ride-through capability of wind farms based on SVG equipment. Background technique [0002] In order to ensure that the doubly-fed induction generator (DFIG) can operate safely without disconnecting from the grid when the grid fails, and adapt to the low-voltage ride-through (LVRT) standard for wind power grid-connected, domestic and foreign scholars have studied the control strategy and protection principle of wind turbines when the grid voltage drops. A lot of research has been done. At present, conventional technical solutions can be roughly divided into two categories: one is to conduct research on control strategies, and the other is to increase hardware circuit methods. Instructions attached figure 1 Classification dendrogram for LVRT technical scheme. [0003] Among them, the method based on the control str...

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Problems solved by technology

[0003] Among them, the method based on the control strategy does not need to add additional hardware devices. This type of method is only suitable for the slight voltage drop (small value drop) of the grid voltage, but for the relatively large grid voltage drop (large value drop) caused by serious faults fall), it is difficult to meet the requirements only by improving the control strategy

Based on the method of adding hardware circuits, due to the addition of additional hardware circuits, the design difficulty and manufacturing cost of the unit are increased, which increases the wind power grid electricity price and reduces the economy.

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