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Low Carrier Ratio Online Computing Multi-mode Space Vector Pulse Width Modulation Soft Core

A technology of space vector pulse width and soft core modulation, which is applied in vector control systems, control systems, control generators, etc., to achieve the effects of easy synchronization of PWM signals, increased computing speed, and reduced workload

Active Publication Date: 2016-08-17
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the floating-point DSP in this structure still needs to complete the calculation work related to space vector modulation

Method used

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  • Low Carrier Ratio Online Computing Multi-mode Space Vector Pulse Width Modulation Soft Core
  • Low Carrier Ratio Online Computing Multi-mode Space Vector Pulse Width Modulation Soft Core
  • Low Carrier Ratio Online Computing Multi-mode Space Vector Pulse Width Modulation Soft Core

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Embodiment Construction

[0046] figure 1 Shown, prior art double DSP structure motor control system structure is formed, and the system of this type of structure is mainly made up of a piece of floating-point DSP, a piece of fixed-point DSP and a piece of dual-port RAM, and the main work of each part is: the floating-point DSP mainly runs the motor Core control program, modulation calculation program; dual-port RAM is used for data exchange between floating-point DSP and fixed-point DSP; fixed-point DSP is used for PWM gating signal generation.

[0047] figure 2 It is shown that the existing DSP+FPGA structure motor control system structure is currently composed. This type of structure control system is mainly composed of a piece of floating-point DSP, a piece of FPGA and a piece of dual-port RAM. The main work of each part is: the floating-point DSP mainly runs the motor Core control program, modulation calculation program; dual-port RAM is used for data exchange between floating-point DSP and fixe...

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Abstract

The invention discloses a low-carrier-wave-ratio on-line computation multi-mode space vector pulse width modulation soft core which can complete on-line computation multi-mode space vector pulse width modulation in a high-power three-phase alternating current asynchronous motor control system. The low-carrier-wave-ratio on-line computation multi-mode space vector pulse width modulation soft core mainly comprises an AD control module 01, a double-port RAM 02 based on FPGA, a double-port RAM control module 03, a section judgment module 04, a modulation mode switchover management module 05, an asynchronous modulation time computation module 06, a vector action angle computation module 07, a time normalization module 08 and a PWM signal generation module 09. The low-carrier-wave-ratio on-line computation multi-mode space vector pulse width modulation soft core not only has the advantages of high speeds and high reliability of a hardware circuit, but also has good module reusability and transportability, and is good in steady-state performance and dynamic-state performance. When serving as a motor control system coprocessor, the low-carrier-wave-ratio on-line computation multi-mode space vector pulse width modulation soft core liberates a core controller (a floating point DSP) from a large amount of sine and cosine computation and periodic events occupying too many resources, better runs a motor core control algorithm and improves the performance of the control system.

Description

technical field [0001] The invention relates to the design and manufacture of a high-power three-phase AC asynchronous motor control system composed of a three-phase two-level topology inverter in the fields of rail transportation and shipbuilding. Background technique [0002] The two-level traction inverter drive system is widely used in AC-DC-AC electric locomotive (EMU) traction drive system due to its simple structure and reliable performance. With the continuous development of power electronics technology and the continuous popularization of AC-DC-AC electric locomotives (EMUs), the performance requirements for traction inverter drive systems are getting higher and higher. Asynchronous modulation (SVPWM) technology is widely used in high-power three-phase AC asynchronous motor control system to complete the modulation work of the inverter because of its advantages of easy digital realization and high voltage utilization rate. For the control of high-power three-phase ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P27/12
Inventor 宋文胜吴瑕杰冯晓云王顺亮葛兴来
Owner SOUTHWEST JIAOTONG UNIV
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