Generation and transmission system operation reliability modeling and evaluation method considering primary and secondary frequency modulation

Abstract

The invention discloses a generation and transmission system operation reliability modeling and evaluation method considering primary and secondary frequency modulation. Firstly, in view of the problem that the existing system state analysis model does not consider primary frequency modulation of a wind turbine and secondary frequency modulation of an AGC unit, and after load shedding, the frequency is constantly kept at a lower limit, a load shedding optimization model considering a power flow model for primary frequency modulation of the wind turbine, the primary frequency modulation, the second frequency modulation and the minimum frequency deviation is provided; and on the basis, multiple uncertain factors such as the wind speed, the frequency modulation capacity of the wind turbine, the difference adjustment coefficient, element fault and load fluctuation are further considered, a generation and transmission system operation reliability evaluation method considering primary and secondary frequency modulation is provided, a frequency operation reliability evaluation index is built, and the possibility and the severity of frequency exceeding limit are reflected comprehensively; and finally, on an MATLAB platform, calculation and analysis on the generation and transmission system operation reliability evaluation considering primary and secondary frequency modulation are realized through a program.

Description

technical field [0001] The invention belongs to the field of power generation and transmission systems, and aims to realize the operation reliability evaluation of power generation and transmission systems, and specifically relates to a power flow model considering primary frequency regulation of wind turbines, a load reduction optimization model considering primary and secondary frequency regulation and minimum frequency deviation, and considering a , Secondary frequency modulation generation and transmission system operation reliability evaluation method and so on. Background technique [0002] Frequency is an important operating parameter of the power generation and transmission system. Excessive frequency deviation is not conducive to the safe and reliable operation of the system. In actual operation, it is necessary to maintain the frequency near the rated value through primary and secondary frequency modulation. However, large-scale wind power grid integration not only...

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Problems solved by technology

[0005] The technical solution adopted for realizing the purpose of the present invention is as follows: firstly, the existing system state analysis model does not consider the problem that the primary frequency regulation of the wind turbine, the secondary frequency regulation of the AGC unit and the frequency after the load reduction are always maintained at the lower limit, and a proposal is made to take into account The power flow model of primary frequency regulation of wind turbines, the load reduction optimization model considering primary and secondary frequency regulation and minimum frequency deviation; on this basis, further consideration of wind speed, frequency regulation capacity of wind turbines and its adjustment coefficient, component failures, load fluctuations, etc. Uncertainty factors, put forward a reliability evaluation method for power generation and transmission systems that takes into account primary and secondary frequency regulation, and construct frequency operation reliability evaluation indicators to comprehensively reflect the possibility and severity of frequency violations

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