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In this paper, a second-order sliding mode control based on super-twisting algorithm is applied for bidirectional DCDC converter. Two sliding mode controllers are given for buck mode and boost mode of the DCDC converter, and they can be switched to achieve the voltage/current output regulation according to the different working conditions of DCDC converter. Different working conditions of DCDC converter...
There are several groups of routing algorithms in dynamically changing networks developing every year. We introduce an additional parameter “Battery Life decrease” in the existing Q-Routing protocol. The Battery Life is reduced in direct proportion to the number of packets transmitted to the node. The efficiency of the Optimized Battery Life Q-Routing protocol is estimated by total loss of network...
One of important factors to maximize the utilization and efficiency of any Photo-Voltaic (PV) system is the Maximum Power Point Tracking technique (MPPT). MPPT is specifically used to extract the maximum available power form the PV array, maximum power can be achieved by tracking the Maximum Power Point (MPP) using specialized algorithms such as Perturb and Observe (P&O) and Incremental Conductance...
Photovoltaic (PV) Module is becoming important source as renewable energy due to low maintenance requirements and environmental friendliness. PV module has low efficiency. Hence, The Maximization of PV module become an essential concern. Maximum power point tracking (MPPT) methods required to obtain maximum power point (MPP) of PV module. In this paper, proposes modified firefly algorithm to track...
This paper describes the specific requirements in the design of versatile wireless sensor networks (WSN) and how MAC routing algorithms influence on their performance. Investigation of the impact of the MAC routing algorithms on the battery consumption of the sensor nodes and packet delivery delay is based on the WSN simulation in OMNET++ framework. Simulation results are validated with the actual...
To improve the actual life of lead-acid batteries in communication systems and the existing charge controlled system, a new charge controlled system is designed based on PID regulation algorithm. For the actual control system, we improve the traditional PID algorithm, establish a digital model of PID algorithm and simulate the proposed algorithm by Simulink. Simulation results show that the high controlling...
In this paper, an energy efficient adaptive modulation scheme is proposed for a wireless cognitive radio ad hoc network, where each node is equipped with cognitive radio and the network is an OFDMA system operating on time slots. In each slot, the users with new traffic demand will sense the spectrum and locate the available subcarrier set. Then they choose subcarriers with favorable channel condition...
Opportunistic routing (OR) schemes, such as ExOR, have been shown to provide significant throughput gains over traditional best-path routing schemes for wireless networks. Though the performance of OR schemes depend on the bit-rate, they currently use a fixed rate for transmitting packets. While several schemes have been proposed for selecting bit-rate for unicast transmission to a single receiver,...
A principal factor in sensor network design is energy efficiency. In this work, we propose to extend the lifetime of sensor networks using appropriate choice of sensor node distribution. The key idea of our scheme is to deploy more nodes in areas of extensive energy usage. Using this scheme of sensor node distribution, we use probabilistic angular routing to route data packets from the sensor nodes...
Three applications in wireless networks where model-free stochastic learning is applicable, are discussed. The learning based optimization problems are formulated and simulation results are presented. Some open issues are also discussed.
This paper presents a distributed fermat-point range estimation strategy, which is important in the moving sensor localization applications. The fermat-point is defined as a point which minimizes the sum of distances from three sensors inside a triangle. This point is indeed at the trianglepsilas center of gravity. We solve the problems of large errors and poor performance in the bounding box algorithm...
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