A dual-frequency carrier phase-shift PWM control method based on auxiliary ring energy storage system
An energy storage system and dual-frequency carrier technology, applied in the field of energy storage, can solve problems such as increased computational complexity, complex calculations, and inability to perform online calculations, achieving the effect of convenient control and accurate results
Active Publication Date: 2018-07-17
SOUTHEAST UNIV
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Problems solved by technology
Specific harmonic elimination SHE has good harmonic characteristics, but it cannot be calculated online, and as the number of levels increases, the computational complexity also increases with geometric multiples
The calculation of step wave modulation is also more complicated in the case of high level
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[0017] The present invention will be further described below in combination with the accompanying drawings and specific embodiments.
[0018] A dual-frequency carrier phase-shift PWM control method based on an auxiliary ring energy storage system, the energy storage system includes n conversion units, and the conversion units include switching elements, characterized in that the method includes the following steps:
[0019] (1) n groups of modulation waves are provided, the modulation waves are superimposed by fundamental waves and auxiliary frequency sine waves, and the phases of the fundamental wave components of n groups of modulation waves are the same, denoted as θ; the auxiliary frequency sine wave components of n groups of modulation waves Each phase is different, denoted as Let modulating wave be y i (t), (i=1, 2,...n), let the fundamental frequency be f s , let the auxiliary frequency be f h , let the fundamental angular frequency be ω s , let the auxiliary angul...
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The invention discloses an auxiliary-ring-energy-storage-system-based dual-frequency carrier phase-shifting PWM control method. The energy storage system consists of n conversion units including switch elements. N groups of modulation waves are provided, wherein the modulation waves are formed by superposition of fundamental waves and auxiliary frequency sinusoidal waves, the fundamental wave component phases of the n groups of modulation waves are identical, and auxiliary-frequency sinusoidal wave component phases of the n groups of modulation waves are different; n groups of triangular carrier waves with the same frequency and amplitudes are provided; the n groups of triangular carrier waves and the n groups of modulation waves are compared to obtain n groups of PWM signals; and then connection or disconnection of the switch elements is controlled by using the PWM signals, thereby driving the conversion units. According to the invention, the exchanging power value and direction in all conversion units can be controlled by adjusting different phases; and because of the two kinds of frequency components, decoupling independent control can be realized, so that controlling becomes convenient and the result becomes accurate.
Description
technical field [0001] The present invention relates to the technical field of energy storage, in particular to a dual-frequency carrier phase-shifting PWM (Pulse Width Modulation, pulse width modulation) control method based on an auxiliary ring energy storage system. Background technique [0002] At present, the PWM modulation methods of cascaded multilevel converters can be mainly divided into two categories: modulation technology based on voltage level and space vector modulation technology. Space vector modulation technology has a series of significant advantages, such as low harmonic content and high voltage utilization, which make it widely used in low-level fields. However, for circuits above five levels, its control algorithm will become very complicated. Modulation techniques based on voltage levels are mainly divided into multi-carrier PWM modulation, staircase wave modulation (SW-PWM) and specific harmonic elimination modulation (SHE-PWM). [0003] Although sch...
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IPC IPC(8): H02M1/088
CPCH02M1/088
Inventor 黄丽丽蒋玮张磊
Owner SOUTHEAST UNIV