Source-load cooperative auxiliary frequency modulation method suitable for high-proportion new energy microgrid

Abstract

The invention relates to a source-load cooperative auxiliary frequency modulation method suitable for a high-proportion new energy microgrid, and the method comprises the following steps: 1), determining the frequency control mode of each micro-source participating in the frequency modulation of the microgrid for the high-proportion new energy microgrid comprising a double-fed asynchronous fan, adiesel engine and a controllable load; 2) establishing a source-load cooperative participation microgrid frequency modulation control simulation model in the high-proportion new energy microgrid, andsetting a strategy of participating in frequency modulation; and 3) according to the simulation model, respectively calculating economic benefits of source-load participating in frequency modulation under multiple time scales, including a diesel engine frequency modulation benefit BG, a fan virtual inertia frequency modulation benefit Bwind and a controllable load frequency modulation benefit Bload, and distributing frequency modulation capacity under the condition that the frequency modulation economic benefit Smax is optimal. Compared with the prior art, the source-load cooperative auxiliaryfrequency modulation method has the advantages that the enthusiasm of participation of the source load in auxiliary frequency modulation in the microgrid can be fully aroused, and the frequency modulation pressure of the high-proportion new energy microgrid is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of power system frequency control, in particular to a source-load coordinated auxiliary frequency regulation method suitable for high-proportion new energy micro-grid calculations and optimal economic benefits. Background technique [0002] With the continuous increase in the proportion of new energy access, large-scale new energy without frequency modulation capability is gradually integrated into the grid, and wind power gradually replaces traditional generator sets. This will reduce the system inertia and increase the burden of system frequency regulation, thereby affecting the frequency of the system. Stability, which brings troubles to the stable operation of the power system, it is difficult to maintain the stable operation of the frequency of the new energy power system by relying solely on the automatic adjustment system of conventional units. Doubly-fed induction generator (DFIG) is the mainstream t...

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Problems solved by technology

[0005] Among the existing auxiliary frequency regulation methods, some methods only consider the coordinated frequency regulation of traditional units and the demand side, but do not consider the frequency regulation capability of wind turbines, and are not suitable for microgrids with a high proportion of new energy; some methods only consider system The frequency modulation effect of the system lacks comprehensive consideration of the frequency modulation benefits of the power supply side and the demand side, and does not take into account the optimal economic benefits of system frequency modulation

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