A MULTI-LEVEL GRID CONNECTED TRANSFORMERLESS CASCADED H-BRIDGE INVERTER FOR POWER QUALITY APPLICATIONS

electrical engineering

This paper is proposed a transformer less static synchronous compensator system based on multi-level cascaded H-bridge converter with star configuration to compensate the reactive power in transmission system. This proposed system with controller devotes themselves not only to the current loop control but also to the dc capacitor voltage control. With regards to the current loop control, a nonlinear controller based on the passivity-based control theory is used in this structure. As to the dc capacitor voltage control, overall voltage control is realized by adopting a proportional integral controller. Individual balancing control is achieved by shifting the modulation wave vertically. Also Discrete wavelet control as controller has used instead of PI controller to have balanced DC-link Voltage. A three phase five-level H-bridge cascaded STATCOM has designed using MATLAB software for theoretical analysis. The dc capacitor voltage can be maintained at the given value effectively using the proposed control.

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