Abstract
This paper introduced modular multi-level converter (MMC), which could enhance the voltage and power level by sub-converter modules in series and was easy to extend to any level of output. Its structure and working mechanism were described. By analyzing the energy transfer performance of STATCOM based on MMC working conditions in the compensation, a comprehensive compensation control strategy was proposed based on direct current control mode. By analyzing the higher harmonic components circulation generated by the inconsistencies in the three-phase upper and lower arm voltage, a loop control strategy is proposed for the suppression of the circulation in the arms of the M-STATCOM. The simulation results show the strategy has a better tracking precision and response speed for the compensation control.
Highlights
With the development of power electronics technology, a variety of high-power switching devices was used widely
There are the main problems for two-level VSC, which are static voltage balance, dynamic voltage balance and electromagnetic interference (EMI) caused by the insulated gate bipolar transistor (IGBT) series, and excessive switching losses caused by the high switching frequency
In 2002, a new topology of modular multi-level VSC is proposed by Germany Bundeswehr Munich University
Summary
With the development of power electronics technology, a variety of high-power switching devices was used widely. In the high-voltage high-power application fields, the demand for advanced power electronic devices has become increasingly urgent, such as in the field of power transmission and distribution, voltage source converter(VSC) has be widely used. There are the main problems for two-level VSC , which are static voltage balance, dynamic voltage balance and electromagnetic interference (EMI) caused by the insulated gate bipolar transistor (IGBT) series, and excessive switching losses caused by the high switching frequency. The new modular multilevel VSC (MMC) satisfies the modular functional requirements, and it will capacitance and switching device as a whole to build a sub-module, to enhance the voltage and power level by sub-converter modules in series, easy to extend to any level of output, and it can be used to reduce switching loss and improve transmission efficiency with low harmonic distortion and lower switching frequency
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