Driving system for wind power generation of parallel net type with generated power totally monitored

Abstract

The invention provides a power generation power fully-controlled grid-connected type wind power generation driving system. The system orderly comprises blades, a wind power generator, a power electronic frequency conversion and electric energy transducing circuit and a three-phase power transformer, wherein the wind power generator is a multiphase permanent-magnet wind power generator, a stator armature winding of which adopts a multiphase structure, and total number of phases of the stator armature winding is 3xNxM, wherein N is cascade number, and M and N are natural numbers; the power electronic frequency conversion and electric energy transducing circuit comprises 3xN tandem type rectification voltage stabilization and inversion power electronic modules. Because the system adopts the multiphase permanent-magnet wind power generator and the tandem type power electronic frequency conversion and electric energy transducing circuit, the system realizes wide range of operating speed ofthe wind power generator and the fully controlled grid-connection of generated output active power and reactive power; moreover, the system has the characteristic of high reliability and can better meet the networking requirement of large-capacity power generation systems so that the system is particularly applied to wind power generation systems with high energy recovery, high efficiency and high power.

Description

technical field [0001] The invention relates to a driving system for wind power generation, in particular to a driving system for wind power generation with full power control and grid connection. technical background [0002] In the wind power drive system, the following wind power drive systems are usually used: [0003] 1. Fixed frequency wind power drive system [0004] see figure 1 , is a fixed-frequency wind power drive system in the prior art, using a three-phase asynchronous or synchronous generator, the stator winding is connected to the power grid through a power transformer, the working frequency and voltage of the stator are fixed, and the rotor speed of the generator is not adjustable or can be adjusted by changing the pole of the motor. The logarithm is adjusted in steps, and the reactive power is adjusted through the reactive power compensation device. [0005] The average energy recovery rate of this kind of wind power drive system is low, the ability to...

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Problems solved by technology

[0011]However, this kind of power generation full-control grid-connected wind power drive system requires full-power power electronic frequency conversion and power conversion circuits, typical power electronic frequency conversion and power conversion circuits The structure is shown in Figure 4, for high-power wind power generation Drive system, AC-DC- Semiconductor switching devices in AC power electronic inverters require high-voltage and high-current switching capabilities, resulting in high system costs, and semiconductor switching devices are prone to current and voltage spikes when switching under high-voltage and high-current conditions, resulting in component damage or reduced service life. Voltage and high current switches are prone to generate a lot of electromagnetic interference, which affects the reliability of the control system

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