System and method for adaptively adjusting power load according to power grid frequency deviation

Abstract

The invention relates to a system and a method for adaptively adjusting a power load according to power grid frequency deviation. The system is technically characterized in that a mutual inductor device of the system obtains a secondary voltage signal which can be used for measurement from a primary power grid; a high-precision dynamic measurement module is used for carrying out high-precision dynamic measurement on the secondary voltage signal to obtain measurement data; a waveform fitting calculation module is used for carrying out fitting calculation on the measurement data to obtain a power grid voltage frequency deviation parameter; a frequency power response module is used for calculating a power load control target according to the power grid voltage frequency deviation parameter and a preset control law; and a power control output module is used for outputting a power load control target according to the load control interface so as to realize a function of controlling a controlled power load. The system is reasonable in design, can achieve the second-level or even millisecond-level adaptive adjustment function of the power load according to the frequency deviation, improves the operation stability of a low-inertia power system, and remarkably improves the anti-disturbance capability of a power grid.

Description

technical field [0001] The invention belongs to the technical field of power system automation, in particular to a system and method for adaptively adjusting power loads according to grid frequency deviation. Background technique [0002] In order to ensure the stable operation of the system and reduce the system disturbance caused by dynamic load changes, in the AC grid system, the physical characteristics of the large-mass inertia wheel set in the generator are usually used to keep the overall inertia of the AC grid at an appropriate margin and improve the system’s response to the load. disturbance resistance. However, with the development of new energy technologies, the penetration rate of new energy sources such as wind power and photovoltaics in the power grid continues to increase, and the number of UHVDC inverter stations increases, which will reduce the inertia margin of traditional regional power grids and form a low inertia power system. [0003] To sum up, there ...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, to propose a system and method for adaptive adjustment of power load based on grid frequency deviation, and to solve the current problems caused by wind power, photoelectric and other new technologies. The low-inertia power system formed by factors such as the continuous increase in the penetration rate of energy in the power grid and the increase in the number of UHV transmission inverter stations, its stable operation is easily affected by user-side load disturbances.

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