Cascaded operation-mode-adaptive control for power conditioning systems with uninterruptible power supply capability

The growing number of renewable energy sources and power electronic participants are increasingly endangering the quality of supply at distribution grid level. A modular shunt-connected power conditioning system featuring uninterruptible power supply capability is proposed to locally increase power quality and supply reliability. This paper proposes an operation-mode-adaptive cascaded control strategy enabling the power conditioner to fulfill respective quality requirements for grid-connected conditioning mode and island mode of operation. Seamless transition between both modes is guaranteed by using a load-friendly synchronization strategy. The dynamic performance of the chosen control system and operation management is evaluated by means of simulative investigations.

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