A voltage vector stabilizer and control method based on self-frequency synchronization

Abstract

The invention discloses a voltage vector stabilizer based on self-frequency synchronism and a control method. The control method comprises the following steps: an active power Pmeas and a reactive power Qmeas output by the voltage vector stabilizer are detected. When the active power Pmeas or the reactive power Qmeas output by the voltage vector stabilizer is not zero, the voltage vector variation of a grid-connected point is restrained by controlling an internal potential vector, and the rotation speed inertia and the amplitude inertia of a voltage vector of the grid-connected point are achieved. According to the control method, an internal frequency controller and an amplitude controller are used for independently generating a rotation speed omega and an amplitude E of the internal potential vector of the voltage vector stabilizer, the voltage vector of the grid-connected point mains stable, and the rotation speed inertia and the amplitude inertia are provided for the voltage vector of the grid-connected point so that the rotation speed and the amplitude of the voltage vector can not be changed easily. Therefore, the problem of grid connection of an existing novel energy power plant is resolved, and the stability of the novel energy power plant is improved.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and more specifically relates to a voltage vector stabilizer based on self-frequency synchronization and a control method. Background technique [0002] With the decline of fossil energy, new energy power generation has been greatly developed in recent years. At the same time, it can be expected that new energy power generation will occupy a considerable proportion in the energy structure of various countries in the future. Today's new energy power generation mainly includes wind power and photovoltaic power generation. Due to the reverse distribution of energy resources and load demand in China, large-scale new energy power plants are often connected to weak power grids, and the distance between the load and the power plant is more than hundreds of kilometers. Due to the weak power grid, the voltage at the grid-connected point of new energy power plants often fluctuates, but wind turbi...

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Problems solved by technology

[0007] Aiming at the defects of the prior art, the purpose of the present invention is to provide a voltage vector stabilizer and control method based on self-frequency synchronization, aiming at solving the problem that the prior art cannot provide the grid-connected point voltage vector rotation speed inertia and voltage amplitude inertia The problem

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