Study on Power Control Optimization Technology for Wind Turbines During Power Grid Transient Process

Due to the increasing proportion of wind power in regional grids the four corners of the earth and the withdrawal of traditional fossil power sources from operation, wind power is required to take on more responsibility in the grid and proactively involved in controlling the actual operation of the grid on the basis of ensuring safe and stable access to the grid. The LVRT technology for wind turbines in transient processes is now more mature, but the active support technology of wind power to the grid is now mainly reflected in the single function implementation and for the steady state support of the system, as more and more AC and DC mixed connection phenomenon in the grid, and its operating conditions are very complex. This has led to a lack of research on the active support of the grid under various transient processes. This paper investigates the requirements of wind turbines for power active support optimal control techniques during grid transients, the research on the optimization of the reactive voltage control technology in the transient process of wind turbines is not perfect, one of it is the double-fed wind turbines under grid faults and the dynamic state of full power variable-speed wind turbines are unclear, and there are no targeted method for active support of transient process voltages; the other one is the two types of wind turbines, doubly fed wind turbines, as well as full power variable speed wind turbines face the problem of adaptive control of active power during transient processes.