Thermal power generating unit climbing pressure relieving method under high-proportion photovoltaic grid connection

Abstract

The invention discloses a thermal power generating unit climbing pressure relieving method under high-proportion photovoltaic grid connection. The method comprises steps of (1) based on predicted photovoltaic power generation power and load power, performing calculation to obtain a net load duck curve caused by high-proportion photovoltaic grid connection; (2) building a light storage system structure model for high-proportion photovoltaic grid connection, and determining a high-proportion photovoltaic grid connection coordinated optimization operation method based on the light storage systemstructure model; (3) constructing a mathematical model for relieving the climbing pressure of a thermal power generating unit under high-proportion photovoltaic grid connection; (4) solving the constructed mathematical model for relieving the climbing pressure of the thermal power generating unit under high-proportion photovoltaic grid connection based on a linear programming simpleness method; and (5) based on the solving result, relieving the climbing pressure of the thermal power generating unit under high-proportion photovoltaic grid connection. The method is advantaged in that the photovoltaic absorption level is improved, comprehensive operation cost is reduced, peak-valley difference is reduced, the climbing pressure of the thermal power generating unit is relieved, and operation stability of the thermal power generating unit is guaranteed.

Description

technical field [0001] The invention relates to a method for alleviating climbing pressure of a thermal power unit under a high-proportion photovoltaic grid-connected system, and belongs to the technical field of new energy grid-connected accommodation and energy storage. Background technique [0002] Since the release of the plan, the installed capacity of new energy sources such as wind power and photovoltaics has gradually increased, and the installed capacity of photovoltaics has continued to expand. By the end of 2018, it had accounted for 9.4% of the total installed capacity of electricity. Due to the strong randomness and intermittent nature of photovoltaics, which only generate electricity during the day and are not synchronized with the peak load time, a high proportion of photovoltaics connected to the grid will bring a series of problems to the operation of the grid. The California Independent Operator (CAISO) refers to a series of problems caused by the high prop...

AI Technical Summary

Problems solved by technology

Some scholars have alleviated the duck curve problem by introducing thermal power plants, improved the consumption level of photovoltaics, and achieved certain results. However, the conversion efficiency of photovoltaic power generation by solar thermal power plants is not high enough, which is similar in nature to the problem of solar abandonment, and there are still some problems. lack of

The problem of the duck curve cannot be solved fundamentally, especially how to effectively alleviate the climbing pressure of thermal power units, and how to ensure the safe and stable operation of thermal power units and the ability to test disturbances of thermal power units in a high-ratio photovoltaic grid-connected environment There are still deficiencies in the receiving capacity and other aspects, and it is urgent to strengthen research in this area, and it is of great significance to ensure the safe and stable operation of the power grid

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