| Abstract |
This paper proposes a control strategy for grid-interactive Power Conditioning System (PCS) with feedforwardcontrol method based on active frequency detection. PCS should supply the power to criticalloads continuously regardless of grid condition. Hence, PCS detects grid condition fast and transfersbetween two operation modes smoothly. In addition, it also important to detect its operating conditionaccurately for safety. In most of cases, PCS can detect its operation mode. However, when PCS operatesin Non-Detection Zone (NDZ) condition, power gap between PCS and load is almost same, it cannotdetect its operation mode precisely. Hence, other technique is needed to escape NDZ condition. Thispaper proposes using an active frequency method to get out of NDZ condition and a feedforward controlto detect grid condition rapidly for seamless transfer. Controllers are composed of a current controllerwith a feedforward voltage controller. Each of the controllers checks power components independently,Hence, it helps restore the load voltage quickly when grid fault occurs. In NDZ condition, active frequencymethod helps PCS escape this condition. Proposed seamless transfer control strategy is verifiedby the experimental results. |
