Isolated AC-DC matrix converter model prediction control method
A matrix converter and isolation technology, which is applied in the direction of converting AC power input to DC power output, output power conversion device, wind power generation, etc., can solve the problem of unconsidered, unfixed switching frequency of power switching devices, lack of modulation links, etc. problem, to achieve the effect of strong anti-load disturbance ability, rich control scheme, and simplified complexity
Pending Publication Date: 2022-03-25
XIANGTAN UNIV
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] The traditional isolated AC-DC matrix converter model predictive control uses discrete basic voltage vectors, lacks a modulation link, and causes the switching frequency of the power switching device to be unstable, unable to achieve accurate steady-state output, and does not consider the real inductance value in the system If it is different from the inductance value calculated in the model prediction algorithm, the position of the voltage vector cannot be adjusted within a small range of error
At present, there are few model predictive control schemes that combine discrete predictive control and continuous SVM modulation, and rarely consider the problem of model parameter mismatch.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0051] Such as figure 1 As shown, the isolated AC-DC high-frequency chain matrix converter used in this embodiment consists of a three-phase power supply, an input filter L, a three-phase-single-phase matrix converter, a high-frequency transformer, a bridge type uncontrolled rectifier circuit, and an output filter C and load components. The three-phase-single-phase matrix converter is composed of 12 IGBT anti-parallel diodes, which converts the grid-side power frequency AC into positive and negative alternating high-frequency AC, and realizes the electrical isolation of the input and output sides and the voltage up-down transformation through the high-frequency transformer. , High-frequency alternating current is converted into direct current through bridge type uncontrolled rectification circuit.
[0052] Such as figure 2 As shown, the topology of the isolated AC-DC matrix converter is decoupled using the idea of "decoupling and coupling", and is divided into two groups ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a model predictive control method for an isolated AC-DC matrix converter. Continuous modulation and discrete predictive control are combined. In order to simplify the control of a switching tube in a three-phase-single-phase matrix converter, the topology of the three-phase-single-phase matrix converter is decoupled based on a decoupling idea, and the three-phase-single-phase matrix converter is divided into a positive group of pwm converters and a negative group of pwm converters. And constructing three virtual voltage vectors of which the positions can change according to system requirements, and selecting a voltage vector which enables the cost function to be minimum from the reference voltage vector, the three virtual voltage vectors and the basic space voltage vector through a model prediction optimization algorithm. Under the condition that model parameters are not matched with actual parameters of the system, the basic space voltage vector can be used for achieving control over the change direction of the power grid current, and the situation that the change of the power grid current is uncontrollable is prevented. By means of the method, the system can achieve constant direct-current voltage output, a high grid-side power factor and power grid current which changes in a sinusoidal mode and is low in harmonic content.
Description
technical field [0001] The invention relates to the field of matrix converter control, in particular to an isolated AC-DC matrix converter model predictive control method. Background technique [0002] The isolated AC-DC matrix converter is evolved from the two-stage matrix converter, which inherits many advantages of the latter, such as sinusoidal current on the AC side, high input power factor, and compact structure. At present, matrix rectifiers have been widely used in the fields of communication, aerospace, V2G and offshore wind power, and have excellent industrial application value. [0003] The traditional isolated AC-DC matrix converter model predictive control uses discrete basic voltage vectors, lacks a modulation link and causes the switching frequency of the power switching device to be unstable, unable to achieve accurate steady-state output, and does not consider the real inductance value in the system If it is different from the inductance value calculated in...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): H02M7/219H02M1/088
CPCH02M7/219H02M1/088Y02E10/76
Inventor 邓文浪耿振嘉王纯赵东东
Owner XIANGTAN UNIV