Reactive power compensation method of wind farm group based on reactive power generating capacity of doubly-fed wind turbines

Abstract

The invention provides a reactive power compensation method of a wind power plant group based on the reactive power generation capacity of doubly fed induction generators. The method is characterized in that according to information of active power output from wind power plants and basic information of the doubly fed induction generators and a current converter, the reactive power limit of a single doubly fed induction generator is calculated, the sum of the reactive power limit of the doubly fed induction generators in all the wind power plants is calculated, the reactive power regulation capacity limit of each wind power plant is obtained, a range reference is provided for setting of a power grid scheduling value, the range value limit of reactive power of each power plant is calculated, and on this basis, reactive power distribution of the wind power plant group is conducted; the reactive power compensation value of each wind power plant is obtained, sequencing is conducted on the compensation values, mutual compensation of the reactive power of every two wind power plants having supplies and demands respectively is completed, multi-iteration is conducted until the mutual compensation can not be completed, and reactive power compensation of the remaining parts needing compensation is completed by using reactive power compensation equipment in the corresponding wind power plant.

Description

technical field [0001] The invention belongs to the technical field of wind power generation grid-connected reactive power compensation control, and in particular relates to a reactive power compensation method for wind farm groups based on the reactive power generation capability of double-fed wind turbines. Background technique [0002] In recent years, wind power as a clean and non-polluting energy has been widely praised and utilized. However, the quantitative construction of wind farms has made my country's wind power industry accumulate in quantity, but has not improved in quality. Because most of the wind farms in my country use wind turbines with a power factor of 1 The constant power mode of operation is simple, but it does not fully utilize the characteristics of the reactive power generated by the doubly-fed wind turbine, and the wind farm operated with a constant power factor of 1, because the doubly-fed wind turbine only emits active power but not Reactive power, ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the technical problem to be solved by the present invention is to provide a reactive power compensation method for wind farm groups based on the reactive power generating capacity of double-fed wind turbines (or wind turbines). Due to the lack of reactive power information interaction between wind farms, by analyzing the output of active and reactive power of each wind farm in the wind farm group, it is judged that the wind farm is undercompensated for reactive power (requiring reactive power compensation) or overcompensation (excess reactive power), and then transmit the information to the wind farm group power monitoring and control office (the place where the reactive power of each wind farm is received, calculated and distributed) through the transmission line. The reactive power undercompensation and overcompensation of all wind farms in the farm group are distributed and calculated to achieve the reactive power supply and demand balance of each wind farm

Images