Direct-current converter based on single-phase MMC and control method thereof
The technology of a DC converter and control method is applied in the direction of DC power input conversion to DC power output, control/regulation system, output power conversion device, etc., which can solve the problem that the large-capacity power collection part cannot be applied and the DC converter has a small capacity , low voltage level and other issues
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0064] Such as figure 1 As shown, Embodiment 1 of the present invention provides a DC converter based on single-phase MMC. The DC converter includes: an inverter module, a transformer module, and a rectifier module; the inverter module and the transformer module The primary side is connected, and the rectifier module is connected to the secondary side of the transformer module; the inverter module includes 4n full-bridge MMC sub-modules, and the rectifier module includes 4N half-bridge MMC sub-modules; every n The full-bridge MMC sub-modules are connected in series to form a bridge arm of the inverter module, and every N half-bridge MMC sub-modules are connected in series to form a bridge arm of the rectification module.
[0065] Wherein, the quantity n of the full-bridge type MMC sub-module in each bridge arm of the inverter module is: n=U MV / U C ;
[0066] Among them, U MV Indicates the DC voltage input at the inverter side, U C is the capacitor voltage of the full-bri...
Embodiment 2
[0083] Embodiment 2 of the present invention provides a control method for a DC converter based on a single-phase MMC, and the control method includes the following steps:
[0084] The modulation strategy of the inverter side is determined according to the transformation ratio of the inverter module.
[0085] The determination of the modulation strategy on the inverter side according to the transformation ratio of the inverter module specifically includes: solving the equations m+s=n and Determine the modulation strategy of the inverter side as the s / m modulation strategy; where, s represents the number of full-bridge MMC sub-modules input into the upper bridge arm of the inverter module, and m represents the full-bridge MMC input into the lower bridge arm of the inverter module The number of sub-modules, n represents the number of full-bridge MMC sub-modules in each bridge arm of the inverter module, a 1 Indicates the transformation ratio of the inverter module.
[0086] T...
Embodiment 3
[0149] Embodiment 3 of the present invention performs simulation verification on the technical solutions in Embodiments 1 and 2.
[0150] Build with Matlab / Simulink software figure 1 In the single-phase DAB type MMC DC converter, it is verified by simulation that the DC converter can realize the boost function under the dual phase-shift control based on SM modulation. Set the input medium-voltage side voltage to 6kV, the working frequency of the medium-frequency transformer to 1kHz, and the transformation ratio K T is 2.5, the inductance of the bridge arm is 1mH, which is attributed to the transformer leakage inductance L on the primary side T is 1mH, the capacitance of the sub-module is 4700μF, the rated voltage is 1.5kV, the number of sub-modules of the medium-voltage side bridge arm is 4, and the number of sub-modules of the high-voltage side bridge arm is 40. In order to transmit power as much as possible, the operating mode is maintained at θ <φ<π-θ, further set the inn...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More