Power control method and system for wind farm unit to participate in frequency modulation and voltage regulation

Abstract

The invention relates to a power control method and a system for a wind farm unit to participate in frequency modulation and voltage regulation, which belongs to the field of circuit devices of an alternating current distribution network. The method comprises the steps that primary frequency modulation is carried out through active-frequency sag control; and when primary frequency modulation doesnot meet a frequency modulation requirement, secondary frequency modulation is carried out through AGC control. Primary frequency modulation is used as an active adjustment function under the condition of frequency fluctuation, and mainly relies on the condition of a wind farm to realize adaptive adjustment control of the system. AGC control assumes the secondary adjustment function of a power system. Complete frequency modulation capability of the wind farm is realized through primary frequency modulation and secondary frequency modulation. The method has the advantages of fast control speed,high precision and high reliability. At the same time, the invention further carries out primary voltage regulation through reactive-voltage regulation sag control. When primary voltage regulation does not meet a voltage regulation requirement, secondary voltage regulation is carried out through AVC control to realize grid-connected voltage adjustment.

Description

technical field [0001] The invention belongs to the field of circuit devices for AC power distribution circuits, and in particular relates to a power control method and system for wind farm units to participate in frequency and voltage regulation. Background technique [0002] In recent years, with the rapid development of global wind power technology, the penetration rate of wind power in power grids in some areas of my country has exceeded 20%. The inherent randomness, intermittency and volatility of wind power make large-capacity wind farms have adverse effects on the dynamic stability of the power grid, frequency regulation and voltage regulation. The control and grid-connected principle of wind power lead to the decoupling of its mechanical power and electromagnetic power, and the decoupling of its rotational speed and grid frequency, thus losing the fast and effective response to the grid frequency, so that the "implicit inertia" in the rotational kinetic energy has a ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a power control method and system in which wind farm units participate in frequency regulation and voltage regulation, which are used to solve the problems of slow control speed and poor control accuracy caused by only one frequency regulation in the prior art, and wind farm units participate in regulation. pressure problem

Images