Network voltage estimation method of single-phase pulsed rectifier

Abstract

The invention discloses a network voltage estimation method of a single-phase pulsed rectifier. The network voltage estimation method comprises the steps: a single-phase pulsed rectifier system is divided into two power parts of active power and reactive power, and active power mathematical models and reactive power mathematical models of reference models in a model reference self-adaptation system are built; according to errors of the active power and the reactive power in the reference models and adjustable models, network voltage fundamental wave estimation values are obtained through a PIcontroller in the model reference self-adaptation system; a phase-locked loop is eliminated, and fundamental wave angle information and angle frequency of the network voltage are estimated through a network-side current and the active power and reactive power of the reference models; and a modulating voltage initial value of the rectifier is designed, and smooth starting of a control system is achieved. A model reference self-adaptation control idea is adopted, the active power mathematical models and the reactive power mathematical models of the reference models and the adjustable models arebuilt, and the network voltage of the single-phase pulsed rectifier without a network voltage sensor is accurately estimated.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a single-phase pulse rectifier grid voltage estimation method. Background technique [0002] Single-phase pulse rectifiers have been widely used in new energy power generation, uninterruptible power supplies, and railway locomotive traction due to their advantages such as high grid-side power factor, low current harmonics, and bidirectional flow of energy. At present, there are many and relatively mature control methods for single-phase pulse rectifiers, and these control methods can be roughly divided into current control and power control. Among them, the current control takes the grid-side current as the control object, and accurately tracks the given grid-side current, so as to realize the control target of constant grid-side unit power factor and constant DC-side voltage. The magnitude and phase of a given grid-side current are closely related to the grid voltage....

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Problems solved by technology

[0005] In view of the above problems, the purpose of the present invention is to provide a single model that adopts the idea of ​​model reference adaptive control, establishes reference models, adjustable model active power and reactive power mathematical models, and can solve the problem of accurate estimation of grid voltage when there is no grid voltage sensor. Estimation method of grid voltage for phase pulse rectifier

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