Power distribution network photovoltaic power station locating and sizing method based on second-order cone theory

Abstract

The invention discloses a power distribution network photovoltaic power station locating and sizing method based on the second-order cone theory. The method comprises steps that the number of PV powerstations accessed by the power distribution network is set to be M, the corresponding capacity of each photovoltaic power station is Cm, on the condition that the minimum power distribution network line loss is taken as a target function, the voltage of each node of the power distribution network is within the normal range, each line of the power distribution network is not overloaded, and the power grid with low-medium voltage levels of the power distribution network does not have trend reversal to the power grid with the high voltage level, a photovoltaic power station locating and sizing optimization model is established, the photovoltaic power station locating and sizing optimization model is calculated based on the second-order cone theory, optimal locating and sizing of the power distribution network photovoltaic power station is obtained, and power distribution network photovoltaic power station locating and sizing based on the second-order cone theory are completed. The methodis advantaged in that power distribution network photovoltaic power station locating and sizing can be realized.

Description

technical field [0001] The invention belongs to the field of new energy grid-connected planning, and relates to a method for site selection and capacity determination of photovoltaic power stations in distribution networks based on second-order cone theory. Background technique [0002] Compared with fossil energy, solar energy, as a renewable energy, has the characteristics of huge storage capacity, wide distribution, low cost of use, clean and pollution-free, and is widely used around the world. [0003] The main form of utilization of solar energy is to use solar energy to generate electricity, that is, photovoltaic power generation. According to the relationship between photovoltaic power stations and the grid, photovoltaic power generation systems can be divided into photovoltaic off-grid power generation systems (independent photovoltaic power generation systems) and photovoltaic grid-connected power generation systems. system. The characteristic of the photovoltaic o...

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Problems solved by technology

The access of these two photovoltaic grid-connected power stations will have a certain impact on the grid. The random access of photovoltaic power stations is not conducive to the unified planning and stable operation of the grid. Therefore, it is urgent to conduct theoretical research on the access of grid-connected photovoltaic power stations.

Now there are two main research methods for this problem. The first idea is to use simulation software such as DIgSILENT to build a distribution network simulation model. Its advantage is that it can obtain various electric energy indicators in great detail, which is conducive to analysis and research. Due to the limitations of the simulation method, the optimization problem cannot be solved very well. If the optimal solution is found by enumeration, the amount of calculation will be large, and the optimal solution may not be obtained. The second way of thinking is to build The mathematical model of each part of the power grid is solved by using an optimization algorithm, but there is no good method to propose an accurate photovoltaic power station connection plan in a very specific way, that is, the location and capacity of the distribution network photovoltaic power station cannot be realized.

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