Quadratic constraint quadratic optimization-based offshore wind farm-containing voltage and reactive power optimal control method

Abstract

The invention relates to a quadratic constraint quadratic optimization-based offshore wind farm-containing voltage and reactive power optimal control method. A transformer branch is regarded as that a normal branch is connected in series with an ideal transformer, a voltage phasor eik+jfik of a middle node is introduced, eckTk=ejk, fckTk=fjk, so active and reactive power flows at the two ends of the transformer branch can be described as a quadratic function of eik, fik, eck and fck; for a compensation node I of a parallel compensator, the compensating reactive power is QCi=(ei<2>+fi<2>)Bi, an auxiliary variable Ui=(ei<2>+fi<2>), Ui is square of voltage amplitude of the node I, and Qci=UiBi; through the treatment, voltage reactive power optimization problem in rectangular coordinates can be mathematically described as a quadratic constraint quadratic programming problem. According to the voltage reactive power optimization, the safety of power grid operation is used as a constraint condition, and the improvement of the economy of the power grid operation is used as an optimization target, so whole network reactive power comprehensive optimization is realized.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a voltage and reactive power optimization control method for offshore wind farms based on quadratic constraint quadratic optimization. Background technique [0002] With the depletion of fossil non-renewable energy sources such as coal, oil, and natural gas and the continuous deterioration of the global ecological environment, how to achieve the coordinated development of social economy and ecological environment has become a major issue to be solved urgently by countries all over the world. In this context, the use of clean energy and renewable energy to replace fossil and non-renewable energy has attracted more and more attention, and has become a hot spot all over the world. In the process of research on clean energy, due to the cleanliness, renewability, abundant reserves of wind energy and the long history of human utilization of wind energy, it has been given priority. ...

AI Technical Summary

Problems solved by technology

[0004] Due to the strong randomness and volatility of wind power, the daily variation of sea and land winds in some areas shows anti-peaking characteristics. After large-scale offshore wind power is connected to the grid, it will bring challenges to the operation and scheduling of the grid.

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