SK942018A3 - Single-branch matrix converter control - Google Patents

Abstract

The single-branch matrix converter control comprises a single-branch matrix converter (1) with a symmetrical power supply, a reference signal source (2), a measurement block (3), a saw generator (4), a SIM (5) and an exciter (6). The single-branch matrix converter control is characterized in that the single-branch matrix converter generates a voltage for the load exactly according to the reference signal from the symmetrical source voltages, thereby achieving the desired load behavior. It is possible to continuously vary the magnitude of current and voltage, frequency and power.

Description

Technical field

The subject of the invention is the control of a single-branch matrix converter, which is intended primarily for the control of a single-branch matrix converter supplied from a symmetrical source with an output center. The invention belongs to the field of power electronics.

Prior art

Matrix converters are converters that allow to supply AC appliances directly from the AC power supply system, by direct conversion of energy (without the need for guidance). They are mainly used in the field of (three - and multi - phase) drives with higher outputs. They are most often powered from a three-phase network, while the inverter output can have a lower or higher number of phases, depending on the type of load (Antoni Arias: Notes on Matrix Converters, http://egdk.ttu.ee/files/2013/Tema_Matrix._Tallinn_May_2013.pdf) . For their operation, they require the use of switches that allow you to conduct and control the current in both directions. A separate category are single-phase matrix converters, designed to supply single-phase applications from a single-phase network (A. Zuckerberger; D. Weinstock; A. Alexandrovitz, Single-phase matrix converter, lEE Proceedings - Electric Power Applications, Volume: 144, Issue: 4, Jul 1997, pp. 235-240, ISSN 1350-2352). The disadvantage of single-phase matrix converters is the fact that they cannot supply voltage to the load when the mains voltage changes to zero (in multiphase applications this problem does not occur), and thus the power supplied to the load is pulsating. By choosing the right output voltage frequencies, this problem can be eliminated, but in the end the possibility of using this converter is very limited. Jednovetvový maticový menič (S. Kascak, R. Konárik, B. Dobručký, M, Praženica, M. Jarabicova: Enhanced single-leg LC matrix converter by switched capacitor and LC filter, 2017 19th Intemational Conference on Electrical Drives and Power Electronics - EDPE The present invention makes it possible to generate a song output voltage corresponding to a reference voltage by means of a single-branch matrix converter by switching symmetrical supply voltages to the zero point.

The essence of the invention

The control of a single-branch matrix converter consists of two parts.

The first part of the system consists of a single-branch matrix converter supplied from a symmetrical power supply, the load being connected between the output center of the power supply and the output of the single-branch matrix converter.

The second part of the system is the control, where the required reference voltage is compared with the saw waveform and based on the measured currently available voltage from a symmetrical source, it is evaluated for switching pulses in a gravel pulse modulator (hereinafter SIM). The evaluated switching pulses are amplified in the exciter to the voltage and current level required for the bidirectional switches of the single-branch matrix converter.

The control of the single-branch matrix converter is characterized in that the single-branch matrix converter generates a song voltage according to the reference signal from the symmetrical voltages of the source. The control achieves high accuracy and dynamics while maintaining all the properties of a single-branch matrix converter.

Overview of figures in the drawings

In FIG. 1 is a block diagram of the control of a single-branch matrix converter

Examples of embodiments of the invention

The control of the single-branch matrix converter, according to FIG. 1, consists of a single-branch matrix converter 1 with a symmetrical power supply, the current voltages of the symmetrical source of which are read and evaluated in block 3 of the measurement. Based on the required reference from the reference signal source 2, the voltage from the measurement block 3 and the current saw value from the saw generator 4, the SIM modulator 5 evaluates the switching state for the single-branch matrix converter 1 with symmetrical power supply. This switching state is fed to the driver 6 who adapts it to the needs of bidirectional switches S1 and S2 of a single-branch matrix converter 1 with a symmetrical power supply

S K 94-2018 Α3

Industrial applicability

The control of a single-branch matrix converter is intended primarily for single-phase applications, but after supplementing with a capacitor, it can also be used for two-phase applications.

With this control it is possible to achieve that the voltage on the load will exactly correspond to the reference - desired signal and in addition the control allows to continuously change the magnitude of current and voltage, frequency, and thus also the power of the connected load.

S K 94-2018 Α3

List of reference marks

- Single-branch matrix converter with symmetrical power supply

- Reference signal source

3 - Measurement block

- Saw generator

-ŠIM

- Driver

- bidirectional switch

52 - bidirectional switch

GND - Device ground

Claims (1)

PATENT CLAIMS Single-branch matrix converter control consisting of a single-branch matrix converter (1) with symmetrical power supply, reference signal source (2), measuring block (3), saw generator (4), 5 SIM (5), driver (6) and bidirectional switches ( S1) and (S2), characterized in that the measuring block (3) is connected to the symmetrical power supplies of the single-branch matrix converter (1) by means of signal wires, further that the reference signal source (2), the saw generator (4) and the block output (3) the measurement is connected by means of signal wires to the SIM (5), the output of which is connected to the input of the exciter (6) by means of signal wires, further that the driver's output (6) is connected to the control electrodes of bidirectional switches (SI) by means of signal wires and (S2) a single-branch matrix converter (1) with a symmetrical power supply