Power plant simulation system taking frequency deviation into consideration

Abstract

The invention discloses a power plant simulation system taking frequency deviation into consideration. An SFR (system frequency response) expansion model considering a boiler / auxiliary engine is established. The operating process of a thermal power plant is simulated on the basis of considering that substantial deviation of system frequency causes power output fluctuations of the power plant auxiliary engine. A boiler / auxiliary engine model is additionally arranged, influences imposed on power output by the frequency are taken into consideration, an actual condition that power output of a unit increases firstly along with frequency reduction and then decreases when the frequency reduces substantially can be simulated, the frequency dynamic process within a wider range can be simulated more accurately, and influences imposed on the boiler or the auxiliary engine by wide-range deviation of the frequency are explained. According to the invention, the boiler / auxiliary engine model is additionally arranged, and the influences imposed on power output by the frequency are taken into consideration, the actual condition that power output of the unit firstly increases along with frequency reduction and decreases when the frequency reduces substantially can be simulated, and the frequency dynamic process within a wider range can be simulated more accurately.

Description

technical field [0001] The invention relates to the technical field of power plant simulation, in particular to a power plant simulation system considering frequency offset. Background technique [0002] The large-scale deviation of the frequency will affect the output of the auxiliary equipment of the power plant, and have a great impact on the safe and stable operation of the power plant. Maintaining the frequency characteristics of the power system is an important factor to maintain the safety and stability of the power system. In recent years, there have been frequent accidents that lead to a large shift in the frequency of the power grid, and even cause the frequency of the grid to collapse. Controlling the system frequency has become an important means to suppress the spread of faults and maintain system stability. Therefore, the research on the frequency stability analysis model of power plants has attracted extensive attention from the engineering and academic circl...

AI Technical Summary

Problems solved by technology

Especially in the case of a large-scale frequency deviation, the output of the auxiliary machine will have a greater impact on the thermal power unit

[0004] The results of numerical simulation are directly affected by the system and component models. Existing research materials generally use generators, boilers, steam turbines, governors and load models at rated frequencies, ignoring the dynamic impact of frequency offset on generators, which will cause simulation The accuracy of the results is poor, and even results that do not match the actual results

The existing SFR model (System Frequency Response model, that is, the system frequency response model) does not consider the boiler / auxiliary machine model, so it cannot consider the situation that the output of the boiler / auxiliary machine drops sharply when the frequency changes in a large range

The frequency characteristic of the unit obtained by the existing SFR model is monotonous, which is only suitable for the case of small frequency changes

Images