New energy grid-connected operation simulation method

Abstract

The invention discloses a new energy grid-connected operation simulation method. Firstly, a wind speed probability density function is established according to the characteristics of randomness, uncontrollability and the like of the wind speed. Meanwhile, the probability density model of wind turbine generator output is derived based on the relation between fan output and the wind speed. After that, for the illumination volatility, a solar irradiance probability distribution model is established and wind power and photovoltaic output characteristics are obtained. Furthermore, a new energy output model is obtained. The obtained new energy output model is embedded into an optimized economic dispatching model which takes the minimum system power generation cost as an objective function and takes consideration of network security constraints. Finally, a refined daily operation simulation model is obtained.

Description

technical field [0001] The invention relates to an operation simulation method for power grid dispatching. Background technique [0002] In recent years, with the depletion of fossil energy, all countries in the world have turned their attention to new energy. However, as more and more renewable energy farms are built and put into the grid, various adverse effects caused by the grid-connected operation of renewable energy also follow. Since the technical problems such as the instability, volatility and low voltage ride-through of renewable energy output cannot be completely overcome in the short term, the grid connection of renewable energy will bring about multi-scale safe and stable operation of system power angle, voltage and frequency. In extreme cases, it may even endanger the safe and stable operation of conventional thermal power units and the UHV DC backbone transmission network, which in turn seriously restricts the interconnected transmission capacity and consumpt...

AI Technical Summary

Problems solved by technology

However, as more and more renewable energy farms are built and put into the grid, various adverse effects caused by the grid-connected operation of renewable energy will follow.

Since the technical problems such as the instability, volatility and low voltage ride-through of renewable energy output cannot be completely overcome in the short term, the grid connection of renewable energy will bring about multi-scale safe and stable operation of system power angle, voltage and frequency. In extreme cases, it may even endanger the safe and stable operation of conventional thermal power units and the UHVDC backbone transmission network, thereby seriously restricting the interconnected transmission capacity and consumption level of renewable energy in large-scale renewable energy bases of the power grid.

In addition, due to the uncertainty of wind speed and light, the fluctuation of wind power and photovoltaic output is very obvious. The amount of abandoned wind in many places in China is on the rise, and the situation is getting worse

[0003] Scholars at home and abroad have done a lot of research on the integration of new energy into the grid. Most of the methods to improve the capacity of grid integration of new energy are to equip conventional thermal power or apply energy storage. However, these methods are limited by economic costs, geographical location, etc. And the constraints of energy storage technology can not effectively improve the capacity of new energy consumption

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