Method and system for improving voltage control capability of wind power station based on coordination control

Abstract

The invention discloses a method and system for improving voltage control capability of a wind power station based on coordination control, and belongs to the technical field of power systems. The method comprises the following steps: 1, reading a voltage of a wind power plant grid connection point after a preset time interval with an initial voltage; 2, determining the variable quantity of the initial voltage of the grid connection point of the wind power plant and the voltage after the preset time interval, if the variable quantity is greater than a preset value, controlling the wind power plant to enter a reactive power control mode of the synchronous phase modifier and the SVG, and if the variable quantity is smaller than the preset value, controlling the wind power plant to enter the reactive power control mode of the SVG; and 3, measuring the voltage of a grid-connected point after the wind power plant enters the reactive power control mode of the synchronous phase modifier and the SVG or the reactive power control mode of the SVG, if the value of the voltage of the grid-connected point is between preset threshold values, controlling the wind power plant to enter the reactive power control mode of the SVG, and if the value of the voltage of the grid-connected point is not between the preset threshold values, returning to the step 1. According to the invention, the voltage control capability and the short-circuit current capability of the wind power plant are improved.

Description

technical field [0001] The present invention relates to the technical field of power systems, and more specifically, to a method and system for improving the voltage control capability of wind farms based on coordinated control. Background technique [0002] In response to the goal of "carbon peaking and carbon neutrality" and building a new power system with new energy as the main body, wind power and photovoltaic power generation have developed rapidly in recent years. As of mid-2017, the installed capacity of wind power in my country reached 154 million kilowatts, and the installed capacity of photovoltaic power generation reached 102 million kilowatts, accounting for more than 13% of the country's installed power generation capacity. Among them, the new energy of 16 provincial power grids including Xinjiang, Qinghai, Ningxia, and northern Hebei has become the second largest installed power source, and the installed capacity of new energy in four provinces including Xinji...

AI Technical Summary

Problems solved by technology

The output of new energy units has obvious intermittency and volatility, which puts great pressure on the stable operation of local power grids due to the large-scale integration of wind power and photovoltaics, which leads to frequent occurrence of large-scale cascading off-grid accidents

[0004] At present, the main voltage regulation measures of new energy stations (wind power / photovoltaic) are realized by static var compensation devices (such as SVG or SVC), but static var compensation devices are all realized by power electronic devices, which have a certain control delay. When the power system voltage is disturbed or caused by a sudden voltage increase / decrease, the static var compensation device may cause reactive power reversal and deteriorate the voltage stability of the system. The static var compensation device is suitable for steady-state voltage regulation , but not suitable for transient fast voltage control

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