Operation of Grid-Connected Cross-Flow Water Turbines in the Stall Region by Direct Power Control

A 1∶1 prototype of power generation system based upon cross-flow water turbines

“…This characteristic has a maximum value (22% +/-2%) that corresponds to a large rotational speed range (60% +/-10%). The flat shape of this curve influences the MPPT convergence speed [9], [16]. The turbine power and torque steady-state characteristics predicted by preliminary simulations and small-scale laboratory measurements [8] are in good agreement with the curve shapes shown in Fig.…”

“…One must also consider the possibility of performing on-line identification and further refining of the dynamic CFWT model. The prototype allows testing of advanced control laws as MPPT, direct power control [16], turbine synchronization, etc. Another future work direction concerns the micro-grid connection, either through a real connection or an emulated grid in order to study the grid impact of a CFWT turbine.…”

Identification and Control of a River-Current-Turbine Generator—Application to a Full-Scale Prototype

“…6a -because of its flat shape around the maximum. The flat shape of this curve influences the convergence speed of MPPT algorithms [30], [36]. The experimentally-obtained characteristics from Fig.…”