Method for predicting direct power of improved T type three-level permanent magnetic direct drive wind power system

A permanent magnet direct drive, wind power system technology, applied in wind power generation, electrical components, circuit devices, etc., can solve the problems of unstable switching frequency and large fluctuation, achieve low input current distortion rate, eliminate DC offset, integrate good effect

Inactive Publication Date: 2017-06-20
YANSHAN UNIV
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Problems solved by technology

However, there are still some problems in this direct power control strategy using the switch table as the power inner loop. The addition of the hysteresis comparator makes the control effect of the converter closely related to the setting of the hysteresis width. The switching frequency is not fixed and fluctuates greatly

Method used

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  • Method for predicting direct power of improved T type three-level permanent magnetic direct drive wind power system
  • Method for predicting direct power of improved T type three-level permanent magnetic direct drive wind power system
  • Method for predicting direct power of improved T type three-level permanent magnetic direct drive wind power system

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specific Embodiment approach

[0151] With TI's TMS320F2812 as the core, an improved T-type three-level inverter experimental platform is built to verify the correctness of the three-level inverter's virtual flux-linkage direct power control. The system hardware circuit design mainly includes three-level inverter main circuit, detection circuit and drive protection circuit, etc., and the control algorithm program is designed according to DSP and hardware platform.

[0152] The main program is mainly responsible for the power-on initialization of DSP, the initialization of system registers and variables, and the setting of timer interrupts. The initialization includes initialization of interrupt vector table, initialization of CPU and system clock, definition of I / O pins, timers and various controllers. initialization etc.

[0153] The SVPWM interrupt subroutine is responsible for detecting the DC bus voltage Udc, A, B phase current signals, calculating the predicted voltage vector and the action time and tr...

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Abstract

The invention discloses a method for predicting direct power of an improved T type three-level permanent magnetic direct drive wind power system. A topological structure of the permanent magnetic direct drive wind power system is an improved T type three-level converter. According to an SVPWM technology, the problem that a switching frequency is not fixed, the system loss is reduced and a power factor of the system is improved. A machine side converter control strategy is a prediction direct power control strategy. A rotating speed loop is an external loop. A power loop is an internal loop. The power loop is prediction power control. A PI adjustor is not required. A control structure is simple and an effect is good. A network side direct power control strategy is a direct power control strategy based on virtual flux orientation. A power network voltage does not need to be sampled. A structure is simple. The system cost is reduced. The dynamic stability is improved. The prediction direct power control strategy and the direct power control strategy based on virtual flux orientation are based on space vector pulse width modulation (SVPWM), so the system has a fixed switching frequency and unit power factor.

Description

technical field [0001] The invention relates to the field of wind power control, in particular to an improved method for predicting direct power of a T-type three-level permanent magnet direct drive wind power system, Background technique [0002] The biggest feature of the permanent magnet direct drive wind turbine generator is that the rotor is excited by permanent magnets, and the stator winding is connected to the grid through a full power converter. The power converter adopts a full power converter with the same capacity as that of the generator, and the variable speed range of the motor is from -100% to 50%. The permanent magnet wind turbine is directly connected to the permanent magnet generator without a speed-up gearbox. The permanent magnet synchronous generator generally adopts a low-speed permanent magnet synchronous generator with more pole pairs, so that the speed requirement of the generator is lower than that of the induction generator, so that the permanent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/46H02J3/38
CPCH02J3/386H02J3/46Y02E10/76
Inventor 杨国良郝帅伊海涛郭永爱柴春花黄炳旭黄智英
Owner YANSHAN UNIV
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