A reactive power distribution method for wind farms with two low-voltage buses

Abstract

The invention discloses a reactive distribution method for a wind power plant equipped with two sections of low voltage busbars. The reactive distribution method comprises the steps of calculating the sum of current reactive power, the sum of incremental reactive power and the sum of decrement reactive power of all fans and reactive compensation apparatuses under the two sections of low voltage busbars according to real-time data and operating state information of each fan and each reactive compensation apparatus in the wind power plant, and real-time electrical quantity information of a booster station; calculating the reactive quantity demand of the whole wind power plant according to a target voltage value on the high voltage side; further calculating the reactive quantity demand of each section of low voltage busbar by combining voltage reactive sensitivity and the reactive quantity demand of the whole wind power plant; determining an actually-provided reactive increment or decrement amount according to a comparison result between the reactive demand, and the sum of incremental reactive power and the sum of decrement reactive power; finally determining the reactive regulation targets of the two sections of low voltage busbars; and regulating each fan and each reactive compensation apparatus in the wind power plant according to the target.

Description

technical field [0001] The invention relates to the technical field of wind power, in particular to a method for distributing reactive power in a wind farm with two sections of low-voltage buses. Background technique [0002] The strategy of sustainable social development requires increasing the utilization of renewable clean energy power generation. As one of the most mature renewable energy power generation methods, wind power has been vigorously developed in recent years. Especially in some areas with rich wind resources, the installed capacity of wind turbines accounts for an increasing proportion of the total installed capacity of the power grid, which brings many new problems to the power system, among which the problem of reactive power and voltage is the most prominent and most concerned one of the problems. [0003] The automatic voltage control (AVC) of the wind farm can stabilize the voltage of the grid-connected point of the wind farm within the given voltage ra...

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Problems solved by technology

The wind turbines in the wind farm are greatly affected by the 35kV busbar. When the voltage at the grid-connected point of the wind farm fluctuates within the allowable range of the national standard, the terminal voltage of some wind turbines has exceeded the normal operating voltage range of the wind turbines, resulting in frequent tripping of the generators.

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