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Probabilistic load flow calculation method for calculating variable correlation

A probabilistic power flow calculation and power flow calculation technology, which can be used in computing, special data processing applications, instruments, etc., to solve problems such as large amount of calculation, and achieve the effect of improving calculation speed, ensuring calculation accuracy, and improving new energy acceptance capacity.

Active Publication Date: 2015-07-01
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology

Although the convolution method has a clear concept, it has a large amount of calculation and can only consider the linear correlation of input variables

Method used

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  • Probabilistic load flow calculation method for calculating variable correlation
  • Probabilistic load flow calculation method for calculating variable correlation
  • Probabilistic load flow calculation method for calculating variable correlation

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Embodiment Construction

[0034] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0035] The present invention makes some improvements on the basis of the traditional semi-invariant method probability power flow calculation, and adopts the following technical solutions for realization:

[0036] like figure 1 Shown, this method comprises the following steps:

[0037] 1. Obtain conventional power flow calculation data, including network parameters, loads and generator injection power, etc. In addition, it also includes the random distribution information of the injection quantity of related nodes. For example, the expected value and variance of the load subject to the normal distribution shall be given, the distribution law of the load of the discrete distribution shall be given, and the generator subject to the binomial distribution shall also be given. Information such as the rated capacity, number of generators and forced outage rate of...

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Abstract

The invention provides a probabilistic load flow calculation method for calculating variable correlation. The method includes the steps: (1) acquiring conventional load flow calculation data and performing certainty load flow calculation; (2) gaining a calculation model for the influence of PV (photovoltaic) node and PQ (performance qualification) node power injection change on node voltage; (3) representing abnormally distributed random variables by normally distributed polynomials; (4) switching the related random variables into unrelated random variables by Cholesky decomposition; (5) performing probabilistic load flow calculation for the variables. Calculation speed is increased while calculation precision is ensured, the method is applicable to analysis, safety assessment and the like for large-scale intermittent energy grid-connected complicated power grid system, and the new energy acceptance capacity of an electric power system can be improved.

Description

technical field [0001] The invention relates to a power flow calculation method, in particular to a probabilistic power flow calculation method considering variable correlation. Background technique [0002] With the rapid development of the global economy, the ever-increasing world energy demand and the fossil fuel-based mineral energy consumption pattern have led to the shortage of energy resources, environmental pollution and climate change. Based on their own resource conditions and economic development goals, countries around the world are actively participating in the development of green energy industries in order to increase their energy supply. my country is in the stage of rapid development of renewable energy power generation. As of the end of 2013, the cumulative installed capacity of wind power in China was 91.42 million kilowatts, ranking first in the world. In 2013, China's new photovoltaic installed capacity was 11.3 million kilowatts, ranking first in the w...

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Application Information

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IPC IPC(8): G06F19/00
Inventor 石飞冯树海於益军姚建国杨胜春李峰王珂王勇汤必强王礼文
Owner CHINA ELECTRIC POWER RES INST
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