Mathematical Modeling and Hardware Experimental Verification of Multilevel FHB Invertevr-Based Statcom

Traditionally, TCR-FC (thyristor-controlled reactor with fixed capacitor) type SVCs with delta-connected configurations and phase-independent control abilities are used in three-phase power distribution systems for unbalanced load compensation and power factor correction. However, due to the conducting characteristics of the thyristors used in the TCR, the SVC has its natural limitation of response time. The performance of the SVC can further be enhanced. Recently, multilevel cascade full h-bridge (FHB) inverter based STATCOMs with delta connection in the main circuit and phase-independent operation ability have been used to replace the roles of SVCs in unbalanced load compensations. However, a more suitable mathematic model is need for the STATCOM for unbalanced operations. In the project, the mathematical modeling of a multilevel cascade FHB inverter based STATCOM for three-phase unbalanced load compensation will be developed and verified. First, the mathematical modeling of a single-phase STATCOM based on multilevel cascade FHB inverter with phase-shifted PWM control will be derived. Then, use of the simulation program MatLab/Simulink constructs the STATCOM simulation system to verify the effectiveness of the developed mathematic model. The single-phase STATCOM will then be used to construct a three-phase, delta-connected STATCOM for unbalanced load compensation. The compensation effect will also be checked by simulation. Finally, a hardware prototype STATCOM will be built in the laboratory. A multi-controller based control system employing the TMS320F28335 DSPs will be used for the STATCOM. Experimental test will be made for functioning verification.

Project ID:PB10408-5752
External Project ID:MOST104-2221-E182-029