Method and device for wind generating set zero-transition dynamic grid connection

Abstract

The invention discloses a method and a device for wind generating set zero-transition dynamic grid connection, and relates to the field of new energy resources. The method comprises the steps of carrying out wind generating set AC / DC converter and DC / AC converter rectification and inversion, acquiring electric physical quantity data of a power grid, a set and a grid-connected switch, detecting zero-transition dynamic grid connection conditions, carrying out grid-connected switch and wind generating set grid-connected inverter coordination control, and carrying out active power flow direction detection and zero-transmission dynamic grid connection control. The device disclosed by the invention is provided with a zero-transition dynamic grid connection signal unit, a zero-transition dynamic grid connection condition detection and active power flow direction detection unit, an electronic power switch unit and a zero-transition dynamic grid connection control unit. Compared with the prior art, the method and the device have the characteristics that a filter is energy-saving, the wind power generation efficiency is improved, the grid voltage quality is improved, and the service life of the grid-connected inverter is prolonged.

Description

technical field [0001] The invention relates to the field of new energy, in particular to a zero-transition dynamic grid connection method and device for wind turbines. Background technique [0002] The diversification of energy supply forms is one of the important strategies to reduce a country's energy risk and improve energy security. In the 21st century, driven by industrialization and urbanization, the world's energy demand will continue to increase significantly. In order to meet the growing energy demand, large-scale energy infrastructure construction is required to increase energy supply capacity. However, due to serious constraints on resources and environmental conditions, the world's energy supply situation is facing severe challenges. [0003] Wind power generation is the power generation form with the most mature technology, the largest development scale and commercial development prospects in the development and utilization of renewable energy in the world to...

AI Technical Summary

Problems solved by technology

[0005] Due to the fluctuation and randomness of wind speed, the output power of wind farms changes, and wind farms are generally located at the end of the power grid, where the grid structure of the power grid is relatively weak, so output power fluctuations and current shocks may occur when wind turbines are connected to the grid A series of problems such as grid voltage fluctuation, line transmission power exceeding the thermal limit, increase of system short-circuit capacity and change of system transient stability

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