Virtual synchronous generator-based shore power source system stability control method

Abstract

The invention provides a virtual synchronous generator-based shore power source system stability control method comprising an active power-frequency control part and a reactive power-voltage control part, virtual inertia control consists of virtual machinery rotational inertia J[omega]0s and machinery damping D[omega]0, a control equation for active power-frequency control P-f is indicated in the description, and a stability control equation for reactive power-voltage control Q-U is indicated in the description. Via the method, a problem of steady state deviation of system frequency in a current VSG technology-based shore power source can be overcome, static difference of system frequency can be eliminated, violent fluctuation of system voltage caused by reactive power rush of ship loads can be effectively checked because a link of reactive power inertia control and virtual excitation control is added in a traditional reactive power-voltage control strategy, and static difference of the system voltage can be eliminated. Via the control strategy disclosed in the invention, automatic power distribution can be realized during parallel operation of high capacity multi-module shore power sources.

Description

technical field [0001] The invention relates to a method for stabilizing a shore power supply system based on a virtual synchronous generator. Background technique [0002] In recent years, the severe environmental pollution and the many social problems caused by ships during port calls have attracted widespread attention and attention from relevant international organizations. The use of shore power instead of marine diesel generator systems can effectively reduce the emission of harmful gases in the port area and improve energy efficiency, which has far-reaching significance for energy saving, emission reduction, green economy and environmental governance. [0003] The shore power supply should be able to meet the electricity demand of ships arriving at the port from various countries. International ships generally use a power frequency of 60Hz, while the frequency of my country's power grid is 50Hz, so power frequency conversion is required. At present, the shore power ...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a shore power supply system stability control method based on a virtual synchronous generator, which can effectively suppress the drastic changes in the system frequency and voltage caused by the power load impact of the ship power grid, eliminate the static error of the system frequency and voltage control, and solve the problem of The existing technology cannot eliminate the steady-state deviation of the system voltage, especially the problem of severe voltage fluctuations caused by the reactive power impact of the high-power ship power grid.

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