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Modulation depth optimization control system for six-switch converter and method thereof

A technology of modulation depth and optimized control, applied in the direction of converting AC power input to DC power output, current collector, output power conversion device, etc., can solve problems such as the decrease of DC link voltage utilization rate, the increase of system cost, and the decrease of operation efficiency. , to achieve reasonable design, improve operating efficiency, and reduce costs

Pending Publication Date: 2020-02-11
ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO +2
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Problems solved by technology

When there is a phase difference between the upper and lower two sets of modulation curves, the voltage utilization rate of the DC link will decrease, which puts higher requirements on the withstand voltage level of the switching device, increases the system cost, and reduces the operating efficiency

Method used

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  • Modulation depth optimization control system for six-switch converter and method thereof
  • Modulation depth optimization control system for six-switch converter and method thereof
  • Modulation depth optimization control system for six-switch converter and method thereof

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0024] The structure and control method of the existing six-switch On-line UPS are described below:

[0025] Such as figure 1 As shown, the existing six-switch On-line UPS includes two phases, A and B, and each phase bridge arm is composed of upper, middle and lower switching devices connected in series. Both the upper and lower input / output are connected to the mains and load through the filter. Under normal working conditions, the utility power is divided into two paths, one path supplies power to the load through AC / DC, and the other path supplies power to the battery through AC / DC; when the utility power fails, the battery supplies power to the load through DC / AC.

[0026] Limited by the structure of the six-switch converter, in the traditional control mode, the uplink modulating wave signal must be higher than the downlink modulating wave signal within...

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Abstract

The invention relates to a modulation depth optimization control system for a six-switch converter and a method thereof. The system is technically characterized by comprising two current detection modules, two voltage detection modules, two reference waveform generation modules, a reference current generation module and an operation state detection module, wherein outputs of the two current detection modules and the two reference waveform generation modules are connected to the operation state detection module, and output signals of the operation state detection module are modulated to form driving pulse signals for operation of the six-switch converter. According to the method, the current running state of the six-switch converter is detected, and when the six-switch converter is locatedin a modulation depth optimizable interval, upper and lower paths of reference modulation signals are adjusted. By judging the directions of the upper and lower paths of current and adjusting the positions of the upper and lower paths of reference modulation signals of the corresponding phase, the crossing of the upper and lower paths of modulation signals of the same phase in the same carrier interval is realized, the operation efficiency of the six-switch converter is improved, and the cost of the six-switch converter is reduced.

Description

technical field [0001] The invention belongs to the technical field of power electronic equipment, in particular to a modulation depth optimization control system and method for a six-switch converter. Background technique [0002] With the continuous improvement of science and technology and economic level, whether in life or production work, people rely more and more on electricity, and higher standards are required for the reliability of power grid power supply. Especially for users who are extremely sensitive to power quality, such as hospitals, high-tech manufacturing, and data centers, even small power quality distortions (voltage sags, harmonic interference, etc.) may cause major economic losses and even endanger personal safety. In order to avoid this kind of phenomenon, power quality compensation devices such as uninterruptible power supply (UPS) and static var compensator have emerged from time to time. Among them, the online uninterruptible power supply (On-line ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J9/06H02J7/02H02M1/10H02M7/483
CPCH02J9/061H02J9/062H02J7/02H02M1/10H02M7/483
Inventor 李楠李松原郗晓光张弛高峰赵聪郭博文李苏雅李维博吉扬
Owner ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO
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