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The Predictive PI controller is considered a viable candidate to replace conventional PID for WirelessHART networked control system (WHNCS). This is due to its shared characteristics of simplicity and ease of manual tuning while allowing for mismatches and improved performance even in the presence of stochastic delay. However, in order to avoid excessive overshoots and oscillations due to the stochastic...
The predictive proportional integral (PPI) controller being simple and non conservative like its Smith predictor and internal model control (IMC) counterparts, has the ability to be employed in environments characterised by uncertainties such as stochastic network delays. However, its performance degrades in the presence of measurement noise. This is due to the prediction involve in the controller...
Since 2007, the emerging wireless technologies for industrial applications such as wireless highway addressable remote transducer (WirelessHART), and ISA100.11a have been used mainly for process monitoring application only. When gearing toward control application of these technologies a common factor that often being considered is network latency or known as delay. Although the typical network round...
As control using wireless technology is receiving increased attention, its often associated with network delays and uncertainties. The use of PIDs proved inadequate to handle these challenges while model based controllers are complex. As a compromise, this paper examines the use of Predictive PI (PPI) controller in a wireless networked control environment characterized by both network delay and process...
This paper presents design and Simulink implementation of zero voltage switching (ZVS) phase-shifted full bridge dc-dc converter. The phase-shifted full bridge PWM dc-dc converter is widely used in high power, high voltage applications due to the advantages of high power handling capability with low switching and conduction losses. The phase shift feature of the control signal allows ZVS thereby eliminating...
WirelessHART standard is the first of its kind specifically designed to withstand stringent industrial requirements of safety, stability, reliability and device interoperability. The standard sets out to overcome the problems associated with cabling for monitoring and control applications in the industry. However, the technology is still in the trial process due to lack of adequate infrastructure...
This paper discusses speed control performance of a proposed hybrid fuzzy-fuzzy controller (HFFC) in a variable speed induction motor (IM) drive system. With respect to finding the rule base of the fuzzy controller, a simple genetic algorithm (GA) is employed to resolve the problem of optimization to diminish an objective function, i.e., the Integrated Absolute Error (IAE) criterion. The principle...
Delay has been one of the critical factors affecting control performance of a wireless networked control system. It leads to the instability of the system. Network induced delay awareness is important for investigating the delay effects on the system. There are several direct and indirect ways to measure delays in a network. This paper concentrates on a direct delay measurement approach between WirelessHART...
This paper presents comparative studies of PID controller tuning methods on a DC-DC converter. A DC-DC boost converter was modelled using averaged state space method for controller design and dynamic analysis. PID controllers were designed using three different PID tuning methods; namely the Ziegler-Nichols frequency domain method, damped oscillation method and Good Gain method. The Matlab/Simulink...
This paper presents a study of Internal Model Control (IMC) scheme to improve control performance of industrial wireless networked control system subject to measured round trip delays. As compared to the auto-tuned optimized PID controller, IMC controller helps to significantly reduce percentage of overshoot for a first order with dead-time process plant. The paper also highlights the differences...
The use of conventional PID controllers has proven to be inadequate in delayed and uncertain networks such as WirelessHART network. This is because the PIDs produce oscillatory and unstable response when large gains are used. Furthermore, the response become sluggish when very small gains are used. Because of complexity, the use of deadtime compensators and other model based controllers in the industries...
The efficiency of commercially available solar PV module is very low in the range of 10–25 % In order to maximise their operating efficiency and to reduce installation cost, maximum power point trackers (MPPT) are coupled with the system. The output power of solar PV depends on solar irradiance level, incident angle, temperature and load current which all contribute to non-linear varying I-V characteristic...
A certain configuration of hybrid electric vehicle (HEV) is the split-parallel hybrid, whose internal combustion engine (ICE) and electric motor provide propulsion power to different axles. The vehicle is also referred to as a ‘through-the-road’ (TTR) hybrid, since propulsion power is coupled through the vehicle itself, its wheels and the road on which it moves. The electric motor can either be on...
In this paper a Park's transformation method for the analysis of bearing inner race surface roughness defects is presented. The existing instantaneous power analysis and stator current analysis techniques are unable to diagnose bearing surface roughness defects, due the fact that characteristics defect frequency model is not available for the bearing surface roughness defects. Thus, this paper proposes...
This paper presents an implementation of Multiple Generalized Predictive Control (MGPC) based a Neuro-fuzzy model to control a real time gaseous nonlinear process. Firstly, a Neuro-fuzzy model, which describes the dynamic characteristics of the process is identified and optimized. Because the consequent part of the identified Neuro-fuzzy model is represented as a form of several Auto-Regressive Exogenous...
Solar energy is considered as fastest growing renewable energy source after wind energy for electricity generation. Solar energy is a free, clean abundant sun energy considered as inexhaustible source for electricity generation. Solar photovoltaic system is characterised with variable output power due to its operation dependency on solar irradiance and cell temperature. To maximize the energy generation...
The Park's transformation method has been used in this paper to analyze distributed defects in the outer race of the bearing. The existing non-invasive motor current analysis and instantaneous power analysis methods are unable to detect distributed defects in the bearings, due the fact that characteristics defect frequencies models are not available for these type of bearing defects. Thus, this paper...
A split-parallel hybrid electric vehicle (HEV) is a particular sub-type of the HEV in which the internal combustion engine (ICE) and electric motor provide propulsion power to different axles. Due to the coupling of power through the vehicle itself, its wheels and the road on which it moves — rather than through some mechanical device — the vehicle is referred to as a ‘through-the-road’ (TTR) hybrid...
This paper discusses the development of an energy management and supervisory control system (EMS) for a hybrid electric vehicle (HEV). It is built on National Instruments' CompactRIO embedded controller and LabVIEW Real-Time software platform. The EMS functions as the primary vehicle controller whose objective is to achieve optimal operation of the hybrid propulsion system — reduced fuel consumption...
A vehicle propulsion system based on internal combustion engine (ICE) includes a throttle body whose function is to regulate the amount of air-fuel intake into the engine to vary the engine's power and thus vehicle acceleration. A mechanical throttle valve body attached to the ICE's air intake manifold is linked to the driver's accelerator pedal via mechanical cable. An alternative system is based...
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