Probabilistic load flow calculation method, giving consideration to photovoltaic non-linear correlation, for power system

Abstract

The invention discloses a probabilistic load flow calculation method, giving consideration to photovoltaic non-linear correlation, for a power system, and the method comprises the following steps: building a photovoltaic power station probability model; building a power sample space of a photovoltaic power station, carrying out the sampling of an output probability density function of a photovoltaic electric field through employing an LHS algorithm, and then obtaining a power sample space of the photovoltaic power station; calculating the probabilistic load flow of a photovoltaic grid-connected system, enabling all groups of sample values in the generated photovoltaic output sample space to be sequentially substituted into a load flow equation for common load flow calculation, obtaining load flow samples of all nodes and branch circuits comprising a photovoltaic grid-connected node, and obtaining a sample space of an output random variable; carrying out the probability assessment of aload flow calculation index, and obtaining the probability statistics characteristics of an output variable needed by photovoltaic grid connection and an index through a probability statistics method.The method provided by the invention enables a probability calculating result to be more accurate, and achieves the accurate description of the uncertainty of the grid-connected system under the condition that the sampling scale is smaller.

Description

technical field [0001] The invention belongs to the field of electric power technology, and in particular relates to a method for calculating the probability flow of a power system considering the nonlinear correlation of photovoltaics. Background technique [0002] In order to reduce the negative impact of environmental pollution in the process of sustainable development, it is an inevitable trend for the future development of the national power system to integrate a high proportion of renewable energy into the grid. However, the large-scale grid integration of renewable energy represented by photovoltaics has brought many uncertainties to the grid operation. Through the calculation of Probabilistic Load Flow (PLF), the statistical information of system operation characteristics (such as node voltage amplitude and phase angle, line active power and reactive power, etc.) can be obtained, and the weak link of system operation can be determined. [0003] The deterministic pow...

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Problems solved by technology

However, this method, like the previous method, fails to consider the nonlinear correlation of photovoltaic output between adjacent areas, so its scope of application is limited.

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