Hu Wenjin

Adaptive control of DC-DC converters based on input equivalent disturbance

DC-DC converter is a class of variable-structure nonlinear time-varying systems, conventional control algorithm is difficult to achieve satisfactory steady and dynamic performance. Taking buck converter as a study object, this paper realizes an adaptive controller for DC-DC converter by online estimating the input equivalent disturbance caused by its inaccurate parameters by use of strong tracking filter, and by correcting control variables of generalized generic model control to compensate effects of time-varying parameters and unknown disturbance. Simulation results testify this adaptive DC-DC converter has a good robustness and control performance while input voltage, reference voltage, load or other parameter changes.

Application research of flocking control algorithm in target tracking of hybrid mobile sensor

Aiming at the target tracking problem of hybrid mobile sensor network in obstacle avoidance, a kind of hybrid mobile sensor network target tracking algorithm based on flocking control is proposed. The algorithm can make the velocity of mobile sensor in the system asymptotically converge to target velocity, and keep an expected distance with the target; in the tracking process, the connectivity of network topology is always guaranteed, while avoiding any obstacle to prevent collision. The simulation results show that the algorithm has good performance in obstacle avoidance and target tracking.