Power supply system for yaw motor in draught fan and power supply method

Abstract

The invention relates to a power supply system for a yaw motor in a draught fan and a power supply method. The power supply system comprises the yaw motor installed in a cabin, and a variable frequency driver connected with the yaw motor. The variable frequency driver is connected with a power grid and used for supplying power to the yaw motor. A perpendicular-axis wind power generator is installed on the upper portion of the cabin and is connected with the yaw motor through the variable frequency driver so as to supply power to the yaw motor when the power grid is powered down. The power supply method mainly comprises the steps that whether power supply of the power grid is normal or not is judged; when power supply is normal, the power grid supplies power to the yaw motor; and when the power grid is powered down, the perpendicular-axis wind power generator generates power and supplies power to the yaw motor. According to the power supply system for the yaw motor in the draught fan and the power supply method, the perpendicular-axis wind power generator does not need to rely on standby fossil fuel or storage batteries, so the power supply time is long; and in addition, the perpendicular-axis wind power generator is low in cost, light in weight and convenient to install and maintain, so that great economic benefits are brought.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a power supply system and a power supply method for a yaw motor in a wind turbine. Background technique [0002] With the shortage of conventional energy and the aggravation of environmental pollution, wind energy, as a renewable green energy, is very important for its development and utilization. In wind power generation, in order to improve the utilization rate of wind energy, the yaw system of the wind turbine must have the function of automatic yaw, that is, the yaw system must automatically and accurately face the wind. After a strong typhoon is forecast, the central controller of the wind farm can order each fan to stop, the impellers are aligned with the wind direction, and the blades are pitched to the feathering angle, so that the circumferential moment and axial thrust generated on the wind rotor can be minimized . Especially in offshore wind farms, sometimes a st...

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Problems solved by technology

Especially in offshore wind farms, sometimes a strong typhoon will damage the power grid system, cutting off the power supply line of the external network of the wind turbine. At this time, it is impossible to repair the line in time. In addition to weather factors, there are occasional accidents when ships break down and break submarine cables. The yaw motor needs to be powered by a backup power supply. There are generally two types of backup power for the yaw motor. One is the battery, which is usually charged by the grid. After the grid is powered off, the battery supplies power to the yaw motor; Diesel generator, the diesel generator works after the grid power failure, and supplies power for the yaw motor

These two power supply methods have certain limitations. First of all, the battery power supply method needs to install a large-capacity battery in the engine room, which not only has high cost, but also has limited battery life, short power supply time, and high maintenance costs. However, the diesel generator power supply method has large equipment size, low power generation efficiency, fuel consumption, slow start-up, diesel generator emissions in the engine room will pollute the equipment, and there is a fire hazard limit, and the maintenance cost is relatively high.

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