A method for alleviating climbing pressure of thermal power units under high-proportion photovoltaic grid connection

Abstract

The invention discloses a method for alleviating the climbing pressure of a thermal power unit with a high proportion of photovoltaics connected to the grid, comprising the following steps: (1) based on the predicted photovoltaic power and load power, calculating the net load duck curve caused by the high proportion of photovoltaics connected to the grid ; (2) Build a solar-storage system structural model for high-proportion photovoltaic grid-connection, and determine a coordinated and optimized operation method for high-proportion photovoltaic grid-connection based on the solar-storage system structural model; Mathematical model of unit climbing pressure; (4) Based on the linear programming simplicity method, solve the mathematical model for mitigating the climbing pressure of thermal power units under high-proportion photovoltaic grid-connected conditions; (5) Based on the solution results, calculate the The climbing pressure of the thermal power unit is relieved. The invention improves the level of photovoltaic accommodation, reduces the comprehensive operating cost, reduces the peak-to-valley difference, alleviates the climbing pressure of the thermal power unit, and ensures the stability of the thermal power unit operation.

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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