Solar excitation device and control method for doubly-fed wind power generator

Abstract

The invention relates to a solar excitation device for a doubly-fed wind power generator and a control method thereof. The output of the solar-electric energy conversion device is connected to the input of the DC conversion circuit through the current sensor, and the voltage sensor is connected to the output of the solar-electric energy conversion device in parallel; the output of the current sensor and the voltage sensor is sent to the central processing unit; the output of the DC conversion circuit connected to the DC bus; the DC side of the DC-AC conversion circuit is connected to the DC bus, and the AC side is connected to the rotor winding of the doubly-fed wind turbine; the energy storage device is connected in parallel to the DC bus; the voltage sensor is connected in parallel to the grid, and its output The voltage signal is sent to the central processing unit; the speed measuring device is installed on the shaft connecting the double-fed wind turbine rotor and the windmill, and its output speed signal is sent to the central processing unit. The invention applies the solar power generation device to the excitation device of the doubly-fed wind power generator. It can further improve the conversion efficiency of wind energy and solar energy, and enhance the stability of the power grid.

Description

technical field [0001] The invention relates to the field of electrical engineering, in particular to an excitation device and a control method thereof which use solar energy to provide excitation for a doubly-fed wind power generator. Background technique [0002] In recent years, in order to make better use of green energy, people have begun to combine wind power generation and solar power generation, making use of their respective advantages to complement each other. The main way of combination is to realize wind power generation and solar power generation separately first, and then connect these two different power generation units to the power grid in parallel. The wind power generation unit is composed of windmills, wind generators and their excitation devices. The solar power generation unit is mainly composed of solar panels, energy storage devices, inverters and other devices. From the perspective of the development of wind power technology, the current wind turbi...

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Problems solved by technology

[0003] (1) In order to maintain the active power balance of the grid, when the electric energy converted by wind energy is greater than the demand of the grid, the pitch of the windmill must be adjusted to reduce the converted wind energy, or an additional energy storage device with a larger capacity and its charging and discharging must be added to the grid Control circuit to absorb the excess electric energy generated by the wind power generation unit, which will inevitably reduce the reliability of the entire power generation device, increase the complexity of control and the cost of the device

[0004] (2) The excess electric energy generated by the wind power generation unit is always sent to the grid first, and then absorbed by the energy storage device, which will inevitably affect the normal operation of the grid and cause voltage fluctuations

[0005] (3) In the existing combination method, the wind power generation unit and the solar power generation unit implement power generation control separately, and it is impossible to form a unified overall power generation control strategy, which is not conducive to the improvement of grid stability

[0006] (4) There is a power conversion device in the excitation device of the doubly-fed wind power generator, and its inverter function is the same as that of the inverter in the solar power generation unit, which not only leads to the repeated use of devices with the same function, but also increases the Cost, and due to the increase of power electronic devices, also reduces the reliability of the whole system

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