A parallel-type independently controllable transmission mechanism (PT-ICT) comprises of two planetary gear trains and two transmission-connecting members. It also includes an input shaft connecting to the input power source, a controller shaft connecting to the controller, an output shaft connecting to the output end, and a free-transmission end connecting to a secondary input source or output end. The controller can independently manipulate the transmitted output speed that is not affected by the variation of the Input speed. Adjusting the free-transmission¡¦s torque can reduce the power of the controller. This study proposes a new structural arrangement of the PT-ICT, and a corresponding test-bed for kinematic and dynamic experiments is also constructed. It first analyzes the theoretical expressions of angular speeds, torques, and power flows introduced on each rotational shaft. And then for the purpose of verifying the validity of the analytical theoretical results, this study also builds a 3D model configuration with its prototype of the PT-ICT is also built to perform kinematic and dynamic experiments. It shows that experimental results are in agreement with the design values. It is expected that applying the proposed PT-ICT mechanism to wind turbines in a variable wind farm can achieve high quality electricity output, extend workable wind speed range, and have no need of using any frequency converters.