Optimal modeling and operating method for photo-thermal power station coping with high-proportion photovoltaic grid connection

Abstract

The invention provides an optimal modeling and operating method for a photo-thermal power station coping with high-proportion photovoltaic grid connection. The method mainly utilizes schedulability ofa heat storage system in a photo-thermal power station, translates light heat energy when sunlight is sufficient, provides required power shortage for sudden reduction of sunset photovoltaic output,and simultaneously provides climbing requirements in a rapid climbing stage of a net load power curve by utilizing good adjustment characteristics of a photo-thermal unit. The method comprises the following steps of: constructing a mathematical model of a photo-thermal power station in detail, and establishing an optimal scheduling model of the power system containing the photo-thermal power station by taking cost minimization as a target; and by utilizing the schedulability and good adjustment characteristics of the photo-thermal power station, performing optimal dispatching of the power system containing the photo-thermal power station, and smoothing the net load power curve to relieve the problem of a duck curve, promote the photovoltaic high-proportion grid-connected consumption and improve the safety stability and the economy of system operation, reduce the influence of the randomness and the intermittence of photovoltaic power generation on the safety stability of the power system.

Description

technical field [0001] The invention belongs to the field of electric power technology, and relates to a system security and stability control technology, in particular to a photothermal power station optimization modeling method and a corresponding operation method for a high proportion of photovoltaic grid-connected. Background technique [0002] Solar energy is widely distributed, easy to obtain, and the production cost of photovoltaic power generation is low. It is one of the fastest-growing distributed power generation new energy sources in recent years. However, photovoltaic power generation is easily affected by factors such as light intensity and ambient temperature, making its power generation output have strong random fluctuations and intermittences. Affected by the rising and setting of the sun, the output of photovoltaic power generation rises rapidly every morning and drops rapidly every evening. At the same time, with the increase of the proportion of photovolt...

AI Technical Summary

Problems solved by technology

Due to the randomness and intermittent nature of photovoltaic power generation, this does not match the traditional peak load in time, which also makes the net load curve of the system present a duck-like outline, that is, the "duck curve". In the increasing part of the duck neck, The traditional power supply in the system needs to increase output rapidly at sunset to make up for the loss of photovoltaic output, but often the regulation capacity of traditional power stations in the system is difficult to support the rapid rise and fall ramp stages in the net load power curve, which will affect the power system. Security and stability

The appearance of the duck curve poses a serious threat to the power balance and frequency stability of the system

[0003] Existing research on coping with the high proportion of photovoltaic grid-connected and alleviating the duck curve mainly focuses on tapping the potential of demand-side response and optimizing the configuration of energy storage systems. There is still a lack of research on the use of flexible power sources such as solar-thermal power stations.

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