Fuzzy Control Method of Virtual Synchronous Generator Based on Auxiliary Inertial Power Regulation

Abstract

The fuzzy control method of virtual synchronous generator based on auxiliary inertial power regulation, including: analyzing the influence of inertial power on the output power and angular frequency of the virtual synchronous generator system through the inertial power expression; introducing the frequency deviation term into the inertial power expression In this method, an ordinary inertial power regulator is added to the active-frequency control link of traditional synchronous power generation; the ordinary inertial power and adaptive parameter J The strategy is analyzed to clarify the regulation law of inertial power in the dynamic process of disturbance; through the regulation law of auxiliary inertial power, a fuzzy controller is designed to adjust the inertial power in the dynamic process. The method of the invention effectively reduces the power overshoot and the maximum deviation of the angular frequency, and at the same time shortens the adjustment time of the system. The auxiliary link designed by this method is relatively independent of the active power-frequency control structure of the traditional virtual synchronous generator. Compared with the adaptive virtual inertia and damping adjustment scheme, it is more flexible in control and can avoid the contradiction caused by parameter adjustment.

Description

technical field [0001] The invention relates to the technical field of new energy power generation operation control using virtual synchronous generator technology, in particular to a fuzzy control method for virtual synchronous generators based on auxiliary inertial power regulation. Background technique [0002] Due to the large amount of non-renewable energy used in traditional thermal power generation, resulting in the depletion of non-renewable energy, the utilization rate of new energy power generation is increasing year by year, so the related technologies of new energy grid connection have also received extensive attention. The inverter of electronic technology is connected to the power grid, and the response speed of power electronic equipment is fast, but it cannot provide inertia and damping for the system. The incorporation of a large amount of new energy into the power grid will greatly weaken the inertia and damping of the power system. The low-inertia system h...

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Problems solved by technology

[0002] Due to the large amount of non-renewable energy used in traditional thermal power generation, resulting in the depletion of non-renewable energy, the utilization rate of new energy power generation is increasing year by year, so the related technologies of new energy grid connection have also received extensive attention. The inverter of electronic technology is connected to the power grid, and the response speed of power electronic equipment is fast, but it cannot provide inertia and damping for the system. The incorporation of a large amount of new energy into the power grid will greatly weaken the inertia and damping of the power system

The low-inertia system has poor support ability, weak frequency adjustment ability and damping characteristics after being disturbed, which threatens the frequency stability

In addition, the output of power generation methods such as photovoltaic and wind power has defects such as volatility, randomness, and uncontrollability, which will make the operating environment of low-inertia power systems worse

[0003] The application of virtual synchronous machine technology can use the energy storage system to provide inertial power support and effectively improve the frequency response characteristics, but it also causes the system output power to overshoot and oscillate, and the active power and angular frequency response cannot be well considered by adjusting its own parameters characteristic

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