Phase-controlled type AC-AC (alternating current) frequency converter real-time trigger pulse generation system and method thereof

Abstract

The invention discloses a phase-controlled type AC-AC (alternating current) frequency converter real-time trigger pulse generation system and method thereof. The system comprises a voltage and current measurement unit, a signal conditioning unit, a pulse real-time generation and coding unit, a serial port communication unit, an interrupt signal source, a frequency converter logical judgment unit, a synchronous parallel unit, a pulse decoding unit and a thyristor driving unit which are all interconnected, wherein a system power supply unit is connected with the signal conditioning unit, the series port communication unit, the pulse real-time generation and coding unit, the frequency converter logical judgment unit, the synchronous parallel unit and the pulse decoding unit through power lines. The method comprises: the phase-controlled type AC-AC (alternating current) frequency converter real-time trigger pulse generation system adopts a multi-pointer method to realize the real-time generation of pulse, and also can reduce the direct current component and subharmonic component of the output voltage. Therefore, the system can be applied to all kinds of high-power AC transmission systems including frequency dividing wind power generation systems.

Description

technical field [0001] The invention belongs to the field of electrotechnical technology, and relates to a real-time trigger pulse generating system and a pulse signal generating method of a phase-controlled AC / AC converter. Background technique [0002] In the case of large-capacity motor transmission, since AC motors are simpler in structure, lower in cost and easier to maintain than DC motors, with the development of power electronics technology, the increased cost of frequency conversion devices for AC speed regulation can be offset by the cost saved by using AC motors. compensation, and after adopting vector control technology, the performance of AC speed regulation has been comparable to that of DC speed regulation. , Ship propulsion, cement rotary kiln, etc., can be widely used. [0003] At the same time, AC / AC inverters can also be widely used in frequency division wind power systems. my country is rich in wind energy resources, but the distribution is uneven. Ther...

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Problems solved by technology

[0007] First of all, due to the limitations of the pulse generation method, the trigger pulse of the thyristor cannot be adjusted accurately in real time, and the output frequency of the low-frequency side cannot be adjusted online. Therefore, when directly applying wind power generation, it can only be operated at a constant speed and constant frequency. The purpose of improving the utilization rate of wind energy is not achieved; secondly, when the pulse number of the main circuit of the AC / AC inverter is 12 pulses or more, the required hardware resources are relatively large, and the real-time algorithm for pulse generation is also a severe problem for the floating-point computing performance of the CPU. However, the general-purpose CPU is helpless because it does not have the hardware resources required for motion control, and a single-chip dedicated chip, such as TI's TMS320 series DSP, is also difficult to complete such a huge amount of numerical and logical operations, so it is impossible to accurately achieve cross-cutting. The real-time dynamic adjustment of frequency and voltage on the low-frequency side of the inverter will increase the characteristic harmonic content of the AC inverter, which cannot meet the requirements of the power system for power quality

Third, the traditional AC / AC inverter controller does not have synchronous parallel units, so it cannot be directly connected to the generator on the low frequency side, which limits the scope of use of the AC / AC inverter

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