Probability trend calculating method considering large-scale photovoltaic grid-connected power generation system

A probabilistic power flow calculation and photovoltaic power generation system technology, applied in photovoltaic power generation, computing, AC network circuits, etc., can solve problems such as voltage limit, power grid safety, photovoltaic power generation output voltage fluctuations, etc.

Inactive Publication Date: 2016-02-24
STATE GRID CORP OF CHINA +2
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Problems solved by technology

Moreover, with the increase of the proportion of intermittent energy in the system, the characteristics of the system's volatility and anti-peak regulation will have a profound impa

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  • Probability trend calculating method considering large-scale photovoltaic grid-connected power generation system
  • Probability trend calculating method considering large-scale photovoltaic grid-connected power generation system
  • Probability trend calculating method considering large-scale photovoltaic grid-connected power generation system

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[0046] In order to better understand the present invention, the content of the present invention is further illustrated below in conjunction with the examples, but the content of the present invention is not limited to the following examples. Those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms are also within the scope of the claims listed in this application.

[0047] Such as figure 1 As shown, a probabilistic power flow calculation method considering a large-scale photovoltaic grid-connected power generation system provided by an embodiment of the present invention includes the following steps:

[0048] S1 establishes the U-I characteristic mathematical model of a typical grid-connected large-scale centralized photovoltaic grid-connected power generation system. This model can automatically adjust parameters according to changes in lighting conditions. At the same time, the establishment of this model also r...

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Abstract

The invention provides a probability trend calculating method considering a large-scale photovoltaic grid-connected power generation system. The method comprises the following steps of: 1) establishing a typical U-I characteristic mathematical model of a grid-connected large-scale centralized photovoltaic grid-connected power generation system; 2) based on an MPPT control algorithm, calculating a maximum output power value of the large-scale centralized photovoltaic power generation system under a typical day illumination intensity, and calculating a mean value and a mean square error of output power; 3) determining a system net frame, considering a power output constraint, and carrying out Monte-Carlo sampling according to probability parameters of a power supply and loads in a system; and 4) considering a node voltage constraint, and calculating a probability trend of the electric power system according to a Newton-Raphson algorithm. According to the real-time illumination intensity of a typical day of someplace, the photovoltaic power generation model can precisely calculate the output of the photovoltaic power generation system and can automatically modify a photovoltaic output equation according to real-time illumination data and environment temperature changes, the method is simple, and the practicality is high.

Description

technical field [0001] The invention relates to the field of stochastic power flow calculation, in particular to a probabilistic power flow calculation method considering a large-scale photovoltaic grid-connected power generation system. Background technique [0002] With the worsening of environmental pollution and the increasingly tense energy supply, new energy power generation has sprung up, especially the rapid growth of photovoltaic power generation. my country has a vast terrain and abundant and widely distributed solar energy resources. The development of photovoltaic power generation technology is of great strategic significance to ensure my country's energy security, energy conservation and emission reduction, and achieve sustainable development. The western region has sufficient sunlight and is most suitable for the construction of large-scale photovoltaic grid-connected power generation systems. . The connection of large-scale photovoltaic power generation to the...

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Application Information

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IPC IPC(8): H02J3/00H02J3/38G06F19/00
CPCH02J3/00H02J3/003H02J3/383H02J2203/20Y02E10/56
Inventor 张海宁王东方贾昆李春来杨立滨杨军李正曦范宏左路浩
Owner STATE GRID CORP OF CHINA
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