Wind power penetration limit calculating method that considers frequency constraint and wind power frequency modulation

Abstract

A wind power penetration limit calculating method that considers frequency constraint and wind power frequency modulation; the method comprises the following steps: using a weight equivalence polymerization method to solve a wind power plant primary frequency modulation response transfer function model and a wind power primary frequency modulation active increment; considering a wind power virtualinertia control strategy, and solving a power system equivalent inertia time constant under different wind power penetration rates; calculating a load damping effect, building a power grid frequencyresponse model that is equivalent to a rotor swing equation, and using the model to describe power system frequency response characteristics; using the power system frequency stable state deviation boundary and frequency rate of change boundary as constraints, and proposing the power grid wind power penetration limit calculating method. The method introduces the real wind power virtual inertia response, the active increment formed by the primary frequency modulation response and the power system frequency constraint into the wind power penetration limit calculation, thus improving the power grid robustness under the wind power grid connection condition, ensuring the power grid to stable and safely operate, and providing important guiding meanings for wind power grid connection planning construction.

Description

technical field [0001] The invention belongs to the field of wind power grid-connected control, and in particular relates to a wind power penetration power limit calculation method considering frequency constraints and wind power frequency modulation. Background technique [0002] With the continuous improvement of wind power penetration, variable-speed wind turbines replace more and more conventional wind turbines and occupy a higher proportion in the power grid, which reduces the equivalent inertia of the power system and weakens the primary frequency regulation capability, leading to deterioration of system frequency characteristics and limiting the power grid. wind power capacity. The penetration power limit of wind power refers to the ratio of the maximum installed capacity of wind farms to the maximum load of the system that the power system can accept under various operating constraints. Wind power virtual inertia control technology and primary frequency modulation a...

AI Technical Summary

Problems solved by technology

If the wind power penetration power limit with virtual inertia / primary frequency control is calculated without considering the wind power inertia / primary frequency regulation method, the result will be conservative, which limits the grid-connected scale of wind power, and is not suitable for the new situation. Wind Power Penetration Power Limit Calculation

Judging from the current constraints on the calculation of wind power breakthrough power limit at home and abroad, the combination of frequency steady-state constraints and frequency transient constraints has not been considered to calculate the penetration power limit

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