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Random reactive optimization method for power distribution network including wind power plant

An optimization method and wind farm technology, applied in wind power generation, reactive power compensation, electrical digital data processing, etc., can solve problems that cannot be simply regarded as PV nodes, PQ nodes cannot be simply processed, and wind turbines do not have an excitation regulation system, etc.

Active Publication Date: 2013-11-20
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

But in fact, the output of the wind turbine mainly depends on the wind speed, while the reactive power depends on the control scheme of the wind turbine, and is closely related to factors such as the terminal voltage and slip, so it cannot be simply treated as a PQ node. The unit itself does not have an excitation regulation system, so it cannot be simply regarded as a PV node

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  • Random reactive optimization method for power distribution network including wind power plant
  • Random reactive optimization method for power distribution network including wind power plant
  • Random reactive optimization method for power distribution network including wind power plant

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[0060] The implementation of the present invention will be further described below in conjunction with the accompanying drawings and examples, but the implementation and protection of the present invention are not limited thereto.

[0061] The IEEE14 node is modified, the system base capacity is 100MW, and the wind farm with a rated capacity of 49.5MW is connected to node 5 through two step-up transformers. The calculation example selects 33 variable-speed constant-frequency double-fed wind turbines with a rated power of 1.5MW , the parameter of the induction motor is r s =4.52mΩ; X s =74.3mΩ; r r =4.34mΩ; X r =53.6mΩ; X m =1.09Ω; machine terminal voltage is 690V, rated power factor is 0.98. The speed regulation range of the generator is -30% to +22%, and its speed regulation control method is as follows: figure 2 shown, where w min =0.7w r ;w max =1,22w r ;kopt=0.72;P rating =1.5MW, P 1 =0.4MW, P 2 =1.1MW, P 3 =1.312MW. Position parameter V 0 =3m / s, shape para...

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Abstract

The invention provides a random reactive optimization method for a power distribution network including a wind power plant, which is used for eliminating adverse effects caused by various undetermined factors of the power distribution network and keeping the power distribution network run in a qualified voltage state. The method comprises the following specific steps: firstly, establishing a probability calculation model considering various random factors; secondly, establishing determining trend including a fan equivalent circuit, establishing a random trend model for the power distribution network including the wind power plant in combination with a semi invariant and Gram-Charlier series expansion method, and solving the voltage of each node and the probability distribution of reactive output of a generator; and lastly, establishing a reactive optimization model including the wind power plant by taking the voltage of each node and the probability distribution of the reactive output of the generator as the chance constraints of reactive optimization, taking the reactive output limit of the wind power plant as a constraint condition and taking a minimum active consumption expected value as a target function, and solving by using a genetic algorithm.

Description

technical field [0001] The invention relates to a reactive power optimization compensation method for a distribution network including a wind farm, and is particularly suitable for solving the voltage fluctuation problem caused by the uncertainty of the output of the wind farm. Background technique [0002] Large-scale wind power grid integration will have adverse effects on the power system. Due to the randomness and volatility of wind, the output power of wind farms is highly unstable. Power flow distribution, safe and stable operation of the power system, and power quality are adversely affected. Among them, the reactive voltage problem caused by wind power grid connection is one of the most common problems in actual operation. In order to ensure the safe and stable operation of the grid and wind farms after grid connection, it is necessary to take necessary reactive power compensation measures to optimize the power flow distribution of the distribution network including...

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Application Information

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IPC IPC(8): H02J3/16H02J3/38G06F17/50
CPCY04S10/545Y02E10/763Y02E40/34Y02E60/76Y02E40/76Y04S40/22Y02E10/76Y02E40/30
Inventor 苏杰和张勇军
Owner SOUTH CHINA UNIV OF TECH
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