The present invention discloses a double-fed wind generator-containing distributed wind farm grid connection method. The method includes the following steps that: step 1, the actual data of wind farm outlet side busbar voltage are acquired, and the total active power and reactive power of a wind farm are acquired and are denoted as Pi and Qi; step 2, the demand amount of the reactive power is calculated; and step 3, control is performed separately according to different conditions. With the method of the invention adopted, the problem of grid disconnection due to over-voltage during the grid-connected power generation process of the distributed wind farm can be solved, and the problem of the security of distributed wind power grid connection due to over-voltage can be solved.

Double-fed wind generator-containing distributed wind farm grid connection method

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.

Reactive power compensation method of wind power plant group based on reactive power generation capacity of doubly fed induction generators

The invention discloses a doubly-fed unit wind farm reactive output power determination method. The method comprises the following steps: S1, according to a wind farm active power prediction result, a doubly-fed unit wind farm active power typical scene set is built, and a happening possibility of each typical scene is calculated; S2, an effective reactive power regulation capacity of the doubly-fed unit wind farm in each typical scene is calculated; S3, a reactive power regulation capacity of a synchronous generator in each wind farm typical scene is calculated; S4, a reactive power optimization model considering the doubly-fed unit wind farm reactive power regulation capacity and synchronous generator AVR regulation effects is built; and S5, a relaxation iteration-based interior point method-genetic algorithm combined solving strategy is adopted to determine the optimal reactive output power for the wind farm. While operation safety of the system can be effectively ensured, the reactive power regulation ability of the wind farm is used, the system operation optimization effects are achieved, and an important guiding role is played in power grid operation after large scale wind power integration.

Doubly-fed unit wind farm reactive output power determination method

The invention provides a double-fed wind power plant adaptive reactive power compensation operation method. The method comprises the following steps: the step 1, the reactive power upper limit Qigmax of each wind turbine generator and the reactive power limit Qwfmax of the double-fed wind power plant are acquired; the step 2, the reactive power demand reference value Qdem of the double-fed wind power plant is calculated according to the grid-connected point voltage offset delta U%; the step 3, if the Qdem is less than or equal to the Qwfmax, then the number k of the wind turbine generator subjected to reactive power compensation according to the reactive power demand reference valueQdem, and the reactive power reference value of each wind turbine generator is acquired; the step 4, if the Qdem is greater than the Qwfmax, then the n wind turbine generators are subjected to reactive power compensation at the same time, and the reactive power reference value of each wind turbine generator is acquired; and the step 5, the reactive power reference value is distributed to the wind turbine generator stator side and network side converter respectively to perform reactive power compensation, and then the process returns to the step 1. Compared with the prior art, the double-fed wind power plant adaptive reactive power compensation operation method provided in the invention can be used to reduce the active loss of the wind turbine generators and simplify the power dispatch control system of the wind power plant so as to improve the operation efficiency of the wind power plant.

Li Chenchen

Papers

Double-fed wind power plant adaptive reactive power compensation operation method