Optimal power flow optimization method of distributed power supplies

Abstract

The invention relates to an optimal power flow optimization method of distributed power supplies. The optimal power flow optimization method of the distributed power supplies includes the following steps: A, variable in a distribution network is initialized; B, load flow calculation is carried out on the distribution network; C, lines are judged to be overloaded or not, and active output force and reactive output force of an engine and the distributed power supplies are judged to overstep the boundary or not; D, if constraint equations are all met, a step E is continued, otherwise a step F is continued; E, an objective function is judged to be the minimum or not, if the objective function is the minimum, a step J is continued, otherwise a step F is continued; F, net loss correlation coefficients are corrected; G, a Jacobean matrix and a Hessian matrix are calculated; H, a problem of sequential quadratic programming is formed and the search direction and a step size are solved; I, output force at the position of a balancing node bus and output force of each distributed power supply are corrected, and the step B is jumped to; and J, an optimal power flow result is output. The optimal power flow optimization method of the distributed power supplies provides basis of access capacity calculation for determining the distributed power supplies to be connected in a power distribution network, is simple in calculation and low in complexity, and can rapidly calculate the output force of the distributed power supplies.

Description

technical field [0001] The invention relates to a method for calculating and optimizing a power system under the access of a distributed power source, in particular to a method for optimizing the optimal power flow of a distributed power source. Background technique [0002] In recent years, distributed generation (DG) has been strongly supported by national policies due to its many advantages, and has become an important development direction in the energy field, and it also provides new options for power grid planning. However, the rapid development of distributed generation and a large number of grid-connected operations also make distribution network planning face more uncertain factors than before. In order to generate an optimized distributed power planning strategy, it is necessary to analyze and calculate the accessible capacity and demand of distributed power. [0003] The State Grid Corporation of China stipulates the technical requirements that new or expanded di...

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Problems solved by technology

[0003] The State Grid Corporation of China stipulates the technical requirements that new or expanded distributed power sources connected to the power grid with a voltage level of 35kV and below should meet. The short-circuit current and penetration rate of distributed power sources are clearly stipulated, but it is still difficult to determine the specific requirements. Distributed power output capacity, especially in the case of complex distribution networks with different network topologies and different load scales

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