Off-grid wind power generation system and optimal frequency tracking control method thereof

Abstract

The invention discloses an off-grid wind power generation system and an optimal frequency tracking control method thereof. The system comprises a wind power generation part, a power transmission and transformation part, a control device, an adjustable second-stage heat load device, and a first-stage heat load device; the power transmission and transformation part is in one-to-one corresponding connection with the wind power generation part, the adjustable second-stage heat load device and the first-stage heat load device; the wind power generation part converts wind energy into electric energy, through the power transmission and transformation part, the electric energy is fed into the adjustable second-stage heat load device and the first-stage heat load device, the control device obtainsthe wind speed and the frequency of the system and sends a control signal to the adjustable second-stage heat load device according to the optimal frequency tracking control strategy, the adjustable second-stage heat load device switches the head load according to the received control signal, and the system frequency is changed. After the system is adopted, the rectifying and inversion process does not need to be involved, equipment cost and maintaining cost needed by power and electronic equipment can be reduced, and the system can be well combined with a distributed type cold and heat combined supply system.

Description

technical field [0001] The invention relates to the technical field of off-grid wind power generation, in particular to an off-grid wind power generation system and an optimal frequency tracking control method thereof. Background technique [0002] As one of the renewable energy technologies with the most development potential, wind power technology has always been an important development direction in the energy field of various countries. There are two main types of wind power development and utilization: grid-connected wind power and off-grid wind power. [0003] Grid-connected wind power is the main form of wind energy utilization in the world today, but due to the instability of wind power, large-scale wind power grid-connected is currently facing a technical bottleneck, and the contribution rate of wind power to the grid is difficult to exceed 10%. At the same time, in order to make the grid-connected wind power meet the requirements of grid frequency, voltage and pha...

AI Technical Summary

Problems solved by technology

[0003] Grid-connected wind power is the main form of wind energy utilization in the world today, but due to the instability of wind power, large-scale wind power grid-connected is currently facing a technical bottleneck, and the contribution rate of wind power to the grid is difficult to exceed 10%

At the same time, in order to make the grid-connected wind power meet the requirements of grid frequency, voltage and phase stability, the wind power generation system must be equipped with a series of control equipment, which also greatly increases the cost of wind power generation.

In addition, in order to eliminate the impact of wind power fluctuations on the reliability of grid power supply, grid companies must also reserve various power generation devices for adjustment, which limits the large-scale application of wind power

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