Merged network and power adjustment system for direct drive permanent magnetic synchronization generator and its method

Abstract

The invention discloses a direct-drive permanent magnet synchronization wind turbine generator grid combination and a power-conditioning approach. The approach comprises the following steps: (1) a wind speed measuring instrument measures the wind speed and transmits the wind speed signal to a microprocessor. The microprocessor realizes maximum wind energy capture to the control of a three-phase full bridge inverter output power and a power grid voltage phase power angle Delta; wherein, the power angle Delta is of the included angle of an output voltage ul of the inverter and a net measure voltage us; (2) the permanent magnet synchronization wind turbine generator is driven by the wind turbine to generate electricity, and the current is converted through a three-phase rectifier circuit and then enters into a three-phase full bridge inverter as a DC bus through a filter circuit; (3) the DC bus voltage is combined with a step-up transformer in grid through a filter reactor under the control of the microprocessor. The invention has the advantages of the better realization of the wind energy track, high stability, miniaturization, convenient maintenance and easy to improve the performance etc. control effects, thus the whole system is simpler in control and lower in cost.

Description

technical field [0001] The invention relates to the field of generator control, in particular to a direct-drive permanent magnet synchronous wind power generator grid connection and power regulation system and method thereof. Background technique [0002] With the continuous growth of global energy consumption, conventional energy resources are increasingly exhausted. Wind power generation is more and more valued by countries all over the world because of its pollution-free, short construction period, flexible investment, less land occupation, and low cost. Compared with the traditional wind turbine topology, the direct-drive permanent magnet synchronous wind turbine has the advantages of shortening the drive chain, reducing mechanical stress, reducing mechanical noise, improving output power quality, and increasing energy capture because it does not require gearboxes and transmissions. Etc. With the development of power electronics technology and motor technology, the int...

AI Technical Summary

Problems solved by technology

[0005] 1. The traditional complex method of controlling the mathematical model of the generator or the method of realizing wind energy tracking through intermediate DC conversion or power disturbance relies too much on the mathematical model and cannot effectively realize the tracking and capture of the maximum wind energy

[0006] 2. Some of the existing wind power generation systems do not use grid-connected quasi-periodic devices or self-synchronizing devices. At the moment of grid connection, current impact and voltage stress on generators and power electronic devices are very large; others even use grid-connected Quasi-period devices, because the grid connection and power regulation devices are separated, the hardware structure is complex, the cost is high, and the cost of the whole machine is increased

[0007] 3. Most of the existing wind power generation systems use asynchronous generators to directly connect to the power grid. The quality of power generation is not high and the harmonic pollution is serious.

[0008] 4. Existing wind power generation systems or control algorithms are cumbersome or not robust, and there is a lack of simple reliability research on AC grid-connected and power regulation control systems for direct-drive permanent magnet synchronous wind turbines

[0009] 5. Most of the transmission wind power generation system uses a gearbox, which increases the transmission, drive chain and mechanical and friction losses, resulting in energy waste

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