A control system and method for a cascaded multilevel inverter
A multi-level inverter and control method technology, applied in the direction of irreversible DC power input conversion to AC power output, electrical components, output power conversion devices, etc., can solve the adverse effects of power grids and motors, voltage, current Problems such as waveform distortion
Active Publication Date: 2016-08-24
HUNAN UNIV
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[0005] However, there is a defect that cannot be ignored in the inverter—the output side and input side voltage or current contain a large amount of harmonic interference, which distorts the voltage and current waveforms. These harmonics will cause adverse effects on the power grid and the motor, and must be suppressed Harmonic Measures
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[0059] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0060] A method for controlling a cascaded multilevel inverter, comprising the following steps:
[0061] A. Determine the center of the sub-hexagon containing the vertices of the reference vector, which is the base vector
[0062] Let the three-phase symmetrical output voltage be The three-phase switching function is S a , S b , S c , and S a,b,c ={0,1,…,m-1}, m is the level number of the multi-level inverter, and the three-phase output voltage can be expressed as u rA1 = S a E,u rB1 = S b E,u rC1 = S c E, then the level sequence number of each phase output can be expressed as 0, 1, ..., (m-1). Add zero-sequence voltage component u Z After that, the three-phase reference voltage is expressed as then there is U ref · = ...
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The invention discloses a control system and method of a cascaded multi-level inverter. The control system mainly comprises a control box, a touch screen and an external I / O interface. The control box is composed of an AVR single-chip microcomputer, a flex10K FPGA produced by the Altera, a sixth-generation TMS320 high-performance chip TMS320F28335 main controller of a 32-digit digital signal processor produced by the Texas Instruments and a Siemens S-300 PLC. According to the control system and method of the cascaded multi-level inverter, the SVPWM algorithm based on the mapping principle is adopted to modulate the five-stage eleven-level inverter, the control mode is flexible, the phase and the amplitude of an output voltage are convenient to adjust and control, and the harmonic content of the output voltage is low. The control system and method of the cascaded multi-level inverter can be applied to the field of variable-frequency speed control of high-voltage and high-power alternating-current motors, can save electric energy and reduce pollution when applied to loads of fans and pumps in water plants and power plants, the high-voltage and high-power alternating-current motors for steel rolling in steel plants and electric locomotive traction systems in rail transit, and have great economic benefits.
Description
technical field [0001] The invention belongs to the technical field of power electronics, and relates to a control system and method for a cascaded multilevel inverter. Background technique [0002] After more than half a century of development, enrichment and improvement of frequency conversion speed regulation technology, with the continuous innovation of modern power electronics technology and the rapid development of microelectronics technology, high voltage and high power frequency conversion speed regulation technology perfectly realizes motor operation, vector control, etc. Excellent performance, has gradually become the mainstream product of today's drive system speed regulation. [0003] As the research object of high-voltage and high-power conversion, multi-level conversion technology has become a brand-new research direction of power electronics. Multi-level conversion technology is a new type of converter, which only improves the topology of the inverter itself ...
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IPC IPC(8): H02M7/48H02M7/483
Inventor 卢峥欧阳红林肖牧轩阳助威
Owner HUNAN UNIV