Power transmission network expansion planning optimization method based on alternating current model

Abstract

The invention discloses a power transmission network extension planning optimization method based on an alternating current model. The method comprises the following steps: establishing a power transmission network extension planning optimization model of two targets; an initial decision variable is generated within the upper and lower limit range of the decision variable according to the random principle, an initial population P is obtained, and the decision variable is the power transmission network line topology; optimizing the line topology initially generated by each individual in the initial population, removing isolated nodes and islands by extending lines, and calculating the line extension cost of the individual according to the finally optimized topology; calculating reactive compensation cost by using a particle swarm optimization algorithm; building a random alternating current probability model of load, wind power and photoelectricity, obtaining a semi-invariant of branch power flow by using a semi-invariant method, and calculating active and reactive power transmission loss expected values by using the semi-invariant; and performing cyclic evolution on the initial population by using a multi-objective optimization algorithm to obtain a multi-objective planning result. According to the method, more accurate reactive compensation can be obtained, and the influence of reactive power can be considered at the same time for reactive compensation.

Description

technical field [0001] The invention belongs to the technical field of transmission network, and in particular relates to an optimization method for transmission network expansion planning based on an AC model. Background technique [0002] With the continuous advancement and development of Chinese society, people's economic and living standards continue to improve, all aspects of society, such as industry, commerce and residents, have put forward higher and higher requirements for power quality, and the demand for power is also increasing. is increasing. As the demand for electrical energy increases, the energy industry must continue to scale up the construction of energy systems. The expansion of the power system scale will inevitably lead to the expansion of the grid scale. Grid interconnection is an important direction for the development of China's power grid. While the power grid plays an important role in power transmission, reasonable and correct planning of the p...

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Problems solved by technology

However, the existing DC model planning methods are completely unable to realize reactive power planning and cannot be close to practical applications.

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