MMC apparatus sub-module capacitor voltage balance method by adopting model predictive control

A technology of model predictive control and sub-module voltage, which is applied to output power conversion devices, electrical components, and conversion of AC power input to DC power output. Improve transient performance, avoid geometric multiple growth, and reduce workload

A technology of model predictive control and sub-module voltage, which is applied to output power conversion devices, electrical components, and conversion of AC power input to DC power output. Improve transient performance, avoid geometric multiple growth, and reduce workload

CN106533229AInactive Publication Date: 2017-03-22XIAN UNIV OF TECH
2 Cites 13 Cited by

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • MMC apparatus sub-module capacitor voltage balance method by adopting model predictive control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0053] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0054] In the present invention, the MMC control circuit includes a system level and a phase control level. The system level includes an AD sampling conditioning circuit and a main control CPU. The information sent by the Hall sensor is connected to the system level control circuit, and the system level control circuit sends the generated control signal to the phase control level control circuit.

[0055] The phase control level control circuit combines the sub-module DC side capacitor voltage information, charge and discharge status and the control information output by the model predictive controller input from the system level to generate, and the sub-module capacitor voltage is graded and pulse-distributed through the sub-module voltage controller. The finally generated trigger pulse signal is connected to the controlled end of the corres...

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

No PUM Login to View More

Abstract

The invention discloses an MMC apparatus sub-module capacitor voltage balance method by adopting model predictive control. The balance method specifically comprises the following steps: step 1, a system-level main control CPU obtains each phase of control signals of an MMC main circuit; step 2, a phase-control circuit divides sub modules into a discharging group, a charging group and an undifferentiated treatment group according to voltage levels; and step 3, the finally input sub modules are determined in a pulse allocation link, and corresponding trigger pulse is generated; and after the trigger pulse passes through a driving circuit, a PWM signal is generated for controlling on-off of a corresponding switching device IGBT, so as to complete sub-module capacitor voltage grouping type model predictive control of the MMC apparatus. By adoption of the balance method, the nonlinear characteristic of the MMC system is maintained while the sub-module capacitor voltage control of the MMC system is effectively ensured as well, the control precious of the system is remarkably improved, burden of a processor is reduced, and the calculated amount of the existing model predictive technology can be reduced to the maximum extent.

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution control, and in particular relates to a method for balancing the capacitor voltage of a submodule of an MMC device using model predictive control. Background technique [0002] Since the new energy represented by photovoltaic power generation has the characteristics of dispersion and intermittency, if it is connected with conventional high-voltage direct current transmission technology, it will affect the grid-connected stability of the power system and cause power fluctuations. Therefore, in order to connect new energy to the grid in an economical, environmentally friendly, and reliable manner, and improve the regional optimal allocation capability of new energy, it is necessary to develop safe, reliable, and high-efficiency flexible DC transmission technology. [0003] The light direct current transmission (VSC-HVDC) system based on the voltage source converter (VSC-H...

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
22 Mar 2017
Publication
CN106533229A
IPC
H02M7/483
CPC
H02M7/483; H02M7/4835
Inventors
ι»„ζ™Άζ™Ά; 荣ζ―