New parallel power processing strategy for the Sequential Shunt Switching Regulator

This paper presents the application of the parallel power processing strategy to the Sequential Switching Shunt Regulator for its use with high parasitic capacitance solar arrays. The main idea consists in dividing the complete solar array into two types of sections, low power sections and high power sections. The controller has been devised in such a way that always one low power section switches to regulate the bus, keeping the same first order closed-loop response that the traditional regulator. On the other hand, the turn-on delay has been mathematically modeled and the impact on the loop gain and the closed loop output impedance have been represented and analyzed. To reduce the impact of the delay, a lead-lag network is added in the control loop, achieving better performances in the AC characteristics.