Variable frequency type three-phase wind power generation system and control method thereof

Abstract

The invention relates to a wind power generation system and a control method thereof, in particular to a variable frequency type three-phase wind power generation system and a control method thereof. The variable frequency type three-phase wind power generation system comprises a master control part, a rectification circuit, an inverter circuit, a detection circuit, a storage battery charging and discharging circuit, a storage battery interface, a wind power generator interface, a power frequency load interface, a variable frequency load interface, an electronic control switch, a warning answering device, and an optional isolation transformer. The control method comprises the following steps: before the variable frequency load is electrified, on the premise that all power frequency loads are allowed to be powered off, all power frequency loads are disconnected and forbidden to be switched on, and the variable frequency load is electrified in a variable frequency mode; when the frequency is changed into a constant power frequency, a system automatically electrifies the power frequency loads which are allowed to be electrified one by one by referring to the advanced setting of a user, wherein the power sum of the power frequency loads is not more than the residual power generation capacity of the system. For the wind power generation system containing the motor type load, the installed capacity of the wind driven generator is reduced at the beginning of the scheme design by the invention, and the cost is lowered.

Description

technical field [0001] The invention relates to a wind power generation system and a control method thereof, in particular to a frequency-variable three-phase wind power generation system and a control method thereof. Background technique [0002] With the development of modern industry, non-renewable energy sources such as oil, coal, and natural gas are becoming increasingly rare. The new energy represented by wind energy conforms to the trend of the global low-carbon economy and has been recognized, valued and supported by governments around the world. [0003] Wind power related industries have developed rapidly in recent years, but up to now, compared with traditional power generation systems that use non-renewable energy such as coal and oil, wind power is still at a disadvantage in terms of cost. This requires scientific and technological workers to continue to explore, on the one hand, to improve the conversion efficiency of the wind power generation system as much as...

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Problems solved by technology

[0004] Nowadays, there are quite a few motor loads among the electric loads. These loads require a large power supply within a short period of time when they are started. The wind power generation system not only provides active power, but also must provide a certain amount of reactive power at the same time. , The power consumption is greatly increased compared with the stable operation. Therefore, at the beginning of the design of the wind power generation system, the designer usually designs the capacity of the wind power generator to be half to several times more wattage than the rated power of the load. Undoubtedly, This greatly increases the installation cost of the wind power generation system mainly composed of wind turbines

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