Determining method of photovoltaic transmission power limit considering variable correlation

Abstract

The invention discloses a determining method of photovoltaic transmission power limit considering variable correlation. According to the method, a random planning problem is built, the photovoltaic transmission power limit maximization is set as a target function, the correlation inside a photovoltaic power station, the correlation between region loads and the correlation of the photovoltaic power generation and the node load change are considered, the constraint conditions are inspected through the sampling on the photovoltaic power output, the traditional machine unit power output and the load level on the basis of a Latin hypercube sampling method, finally, an improved bacterial foraging algorithm is used for solving a planning problem, and the photovoltaic transmission power limit conforming to the conditions is calculated. The method provided by the method has the advantages that the problem of potential safety hazard after the photovoltaic network accessing since the photovoltaic transmission power limit does not conform to the actual production practice is solved, the planning work of the photovoltaic power station can be better guided, the sampling coverage rate is increased, the calculation quantity is reduced under the condition of not influencing the precision, the early stage optimization speed is accelerated, and meanwhile, the later stage optimization precision is also ensured.

Description

technical field [0001] The invention belongs to the planning field of grid-connected new energy sources, and in particular relates to a method for determining a photovoltaic penetration power limit considering variable correlation. Background technique [0002] In recent years, due to the outbreak of the energy crisis and the increasingly serious environmental pollution, the application of new energy has become more and more extensive. As a kind of new energy, photovoltaic has randomness and uncontrollability, which will affect the reliability, stability, power quality and peak regulation characteristics of the power grid. Therefore, when photovoltaics are integrated into the power system, it should be considered whether the scale of photovoltaic power generation will cause hidden dangers to the safe and stable operation of the power system. Referring to the definition of the wind power penetration power limit, the photovoltaic penetration power limit is defined as the perc...

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Problems solved by technology

[0004] Purpose of the invention: In order to solve the problems existing in the prior art due to failure to consider the correlation characteristics between photovoltaic output and node loads, etc., the determined photovoltaic penetration power limit does not conform to the actual production practice, and brings potential safety hazards after photovoltaics are connected to the grid Problem, the present invention discloses a method for determining the limit of photovoltaic penetration power considering the correlation of variables. By establishing a stochastic programming model, the optimal solution of the limit of photovoltaic penetration power is obtained, so as to better guide the planning of photovoltaic power plants.

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