Draught fan dynamic virtual inertia control strategy and system based on tracking differentiator

Abstract

The invention discloses a wind turbine dynamic virtual inertia control strategy and system based on a tracking differentiator. The wind turbine dynamic virtual inertia control strategy comprises the following steps: acquiring a frequency deviation signal of a power system; according to the frequency deviation signal, tracking filtering is carried out through a preset tracking differentiator to obtain a first state signal and a second state signal, the first state signal and the second state signal are used as feedback input signals of the tracking differentiator, the first state signal is tracking state frequency deviation, and the second state signal is a frequency change rate; determining a control reference power signal through a preset virtual inertia controller according to the first state signal and the second state signal; according to a control reference power signal, output power compensation is carried out on a wind power plant where a fan is located, the amplification effect of a conventional differentiator on a high-frequency signal is avoided, measurement noise and high-frequency interference are effectively suppressed, wind power participates in frequency modulation in combination with a dynamic virtual inertia control method, releasable kinetic energy of the fan is more fully utilized, and the measurement efficiency is improved. And the wind power frequency modulation participation capability is improved.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a dynamic virtual inertia control strategy and system for a fan based on a tracking differentiator. Background technique [0002] Wind power is a part of the power system, and the methods for wind power to participate in system frequency regulation can be mainly divided into two categories: virtual inertia control and load shedding control. Virtual inertia control is to temporarily release the kinetic energy stored in the rotor by adding an auxiliary control loop to the maximum power tracking controller to compensate for the reduction of system inertia, thereby increasing the system virtual inertia and suppressing system frequency fluctuations. Load shedding control is to make the wind turbine run in the load shedding mode, and reserve part of the power to support the frequency. Compared with the two, the load shedding control has a wider adjustment range and better adjust...

AI Technical Summary

Problems solved by technology

[0003] The traditional proportional-derivative (PD) virtual inertia control can release the kinetic energy of the wind turbine rotor to support system frequency regulation, but on the one hand, the fixed control parameters make it difficult to make full use of the available kinetic energy of the wind turbine under different working conditions; on the other hand, the virtual inertia control Rate-of-change signals are required for implementation, and differentiators amplify high-frequency noise, such as measurement noise and other system disturbances

In order to solve the above problems, the existing research introduces low-pass filter and inertia control based on extended state observer, but it will affect the control effect

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