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A digital control method without control delay based on dsp

A digital control and non-control technology, which is applied in the direction of output power conversion device, electrical components, AC power input conversion to DC power output, etc., can solve the problems of PWM rectifier bandwidth influence, system bandwidth restriction, etc., to increase bandwidth, The effect of improving performance

Active Publication Date: 2020-05-22
西安翌飞核能装备股份有限公司
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Problems solved by technology

Most conventional processors are DSP processors. Due to the inherent sequential execution of DSP processors and the shadow register problem of DSP event managers, there is always a control delay problem from sampling to refresh time. This control delay This seriously restricts the improvement of system bandwidth. Many scholars have conducted research on this aspect, using double refresh mode and high sampling frequency to achieve half-cycle and 1 / 4-cycle delays, but this delay still affects PWM rectifiers. The bandwidth of the

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  • A digital control method without control delay based on dsp
  • A digital control method without control delay based on dsp
  • A digital control method without control delay based on dsp

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Embodiment Construction

[0026] Below in conjunction with specific embodiment and accompanying drawing, the present invention is described in further detail:

[0027] Such as figure 1 The system shown is a single-phase PWM rectifier: the voltage source converter uses IGBT to realize the topology of three-phase six tubes, the DC bus uses electrolytic capacitors, and the control of the whole system is completed by a DSP, which uses TMS320F28335 of Ti Company. The main work of DSP is timing control, fault protection, and control algorithm realization.

[0028] Such as figure 2 , image 3 Shown are a timing diagram for a traditional single-cycle control delay, and a timing diagram for a traditional half-cycle control delay. Figure 4 The interrupt sequence execution flowchart for traditional long cycle control delay. It can be seen from the figure that the sampling timer and the carrier timer are counted separately. In this case, only underflow refresh or overflow and underflow double refresh can be ...

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Abstract

The invention discloses a digital control method without control delay realized based on DSP. The characteristics of the present invention are: (1) misphase the sampling timer and carrier timer for a certain period of time, and the time length depends on the specific current loop calculation time; 2) adjust the operation sequence of each module in the sampling interruption, and calculate the Current loop; 3) The DSP refresh method adopts the immediate refresh method. Through the adjustment of the above three points, the uncontrolled delay of the digital control mode can be realized, and the bandwidth of the equipment can be improved to the maximum extent. The invention jumps out of established thinking, breaks through the control delay of DSP, and has good application prospects; it will greatly promote the innovation in the field of digital control.

Description

technical field [0001] The invention belongs to the field of power electronics, and in particular relates to a digital control method for a single-phase PWM rectifier. Background technique [0002] With the development of the economy, PWM rectifiers are used more and more widely, because of their characteristics of sinusoidal input current and unit power factor, they gradually replace the old uncontrolled or phase-controlled rectification methods. [0003] With the development of power electronic control technology, whether it is a PWM rectifier or other power electronic topologies, it is developing in the direction of digital control. Compared with analog control, digital control has many advantages, such as using a processor to realize control, high device integration, and no temperature drift and zero drift problems in analog mode. Most of the conventionally used processors are DSP processors. Because of the inherent sequential execution problems of DSP processors and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/219
CPCH02M7/219H02M1/0012
Inventor 赵毅
Owner 西安翌飞核能装备股份有限公司
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