Multi-level power circuit control method and device

Abstract

The invention discloses a multi-level power circuit control method and device. The method comprises the steps of: A, structuring a switching function s=kx1+x2 by a controller on the basis of a load-side voltage in a power circuit; B, carrying out buffer control on the switching function s by the controller; C, obtaining a switching inequation by the controller by using the switching function s subjected to the buffer control and a convergence condition of a control system, and carrying out logic judgment on the basis of the switching inequation to obtain the control law of a switching function ux; and D, determining the number of working power units in the power circuit by the controller on the basis of the position of a differential value between the voltage us of a power grid connected with the power circuit and an ideal power grid voltage d, in the control law of the ux. The device comprises a function structuring module, a buffer control module, a logic judgment module and a circuit control module. The method and the device, provided by the invention, not only can lower the switching frequency of the power circuit but also can optimize output waveforms.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a multilevel power circuit control method and device. Background technique [0002] The multi-level circuit is characterized by high power and no harmonics. The more common one is the series power unit circuit. The number of levels is 2n+1 by using n power units in series. The harmonic content of the output voltage increases with the increase of n. decrease. In the case of high voltage and high power, more power units can be connected in series to meet the demand of large capacity. The control of this high-power circuit is essentially the physical realization of the control algorithm, which is divided into two aspects: first, the control pulse generation and distribution of the switching devices of the power circuit itself; second, the control object and the control strategy algorithm. The traditional PI control uses the error between the controlled object and the reference...

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Problems solved by technology

However, the traditional method has high-frequency jitter, which increases the switching frequency of high-power devices and increases switching losses, so it is limited in high-power voltage control, especially in voltage control, and no related patents have appeared

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