Control method for frequency regulation of electric power isolated network system

Abstract

The invention discloses a control method for frequency regulation of an electric power isolated network system. The control method is characterized by comprising the following steps of step 1, setting the permanent rotating-speed difference coefficient bp, PID parameters, frequency modulation dead zone 0.05Hz, and a frequency range from minus and plus 0.05Hz to minus and plus <theta>Hz for retrieving a frequency modulation module according to power grid requirements, wherein <theta> is a positive number greater than 0.05; step 2, detecting the current unit frequency by a speed regulator; step 3, obtaining a difference value <delta>f between the current unit frequency and a rated frequency 50Hz; and step 4, performing regulation according to the numerical value range of the frequency difference <delta>f. By adoption of the method, the problems of high frequency control error, low precision and instability of the electric power system, particularly the isolated network system can be solved; therefore, accurate and stable control of the power grid frequency is realized; the electric energy quality of the power system is ensured; power grid accident extension is prevented; and rapid recovery of the power grid in faults can be realized.

Description

technical field [0001] The invention relates to a control method for frequency regulation of an electric isolated grid system. Background technique [0002] In the domestic power system, regardless of large grid, small grid or isolated grid, there are usually two conventional methods for power grid frequency regulation: one is to detect frequency fluctuations, with the help of power load statistics with large data volumes, and through a dedicated frequency regulation model, power dispatching is used for each The power plant sets the load, and each power plant adjusts the active power according to the set load curve (data), so as to adjust the frequency of the system, but this adjustment method alone cannot meet the frequency control requirements; the second is for small frequency fluctuation adjustment, In the generator set governor, the control link adopts the difference adjustment formula to adjust the frequency. This formula is the change relationship between the frequenc...

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Problems solved by technology

[0010] In view of the above-mentioned problems, the present invention provides a control method for frequency adjustment of the power isolated grid system, which solves the problems of large frequency control errors, poor precision and instability in the power system, especially the isolated grid system, so as to achieve precise and stable control of the grid frequency. Guarantee the power quality of the power system, prevent the expansion of power grid accidents, and realize the rapid recovery of the power grid after the accident

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