Primary frequency modulation method and system for new energy station

Abstract

The invention discloses a primary frequency modulation method and system for a new energy station. The method comprises the following steps: firstly, acquiring the type of a generator set in a power system and the power grid frequency of the power system; obtaining a frequency modulation dead zone corresponding to the type of the generator set according to the type of the generator set; judging whether a power grid frequency difference between the power grid frequency and a preset standard power grid frequency is located in a frequency modulation dead zone or not; if the power grid frequency difference between the power grid frequency and the preset standard power grid frequency is smaller than the lower limit value of the frequency modulation dead zone, increasing the active power of thegenerator set according to a first adjustment rule, and obtaining the active power required by the frequency modulation operation; if the power grid frequency difference between the power grid frequency and the preset standard power grid frequency is greater than the upper limit value of the frequency modulation dead zone, reducing the active power of the generator set according to a second adjustment rule, and obtaining the active power required by the frequency modulation operation. The method can improve the adjustment precision of the primary frequency modulation of the new energy field station, thereby improving the frequency quality, and improving the power quality.

Description

technical field [0001] The invention relates to the technical field of power system control, in particular to a method and system for primary frequency regulation of a new energy station. Background technique [0002] The fundamental purpose of power system operation is to supply power to users on the premise of ensuring that the power quality meets the standards, and frequency is an important criterion for measuring power quality. Since the grid is a huge inertial system, when the active power of the grid is short, the rotor of the generator accelerates, and the frequency of the grid increases, otherwise the frequency of the grid decreases. Therefore, it is difficult to ensure that the grid frequency remains unchanged, but it is necessary to control the grid frequency within a certain range. [0003] At present, the frequency of the power grid is controlled and adjusted through primary frequency regulation; among them, primary frequency regulation means that once the frequ...

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Problems solved by technology

[0004] With the gradual increase in the penetration rate of new energy in the power grid, it is necessary to perform frequency regulation on new energy stations. However, the existing primary frequency regulation requirements are mainly for conventional units (such as thermal power units and hydroelectric units), without considering the characteristics of new energy stations. For example, the active power of

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