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A disease severity index (DSI) is a single number for summarising a large amount of information on disease severity. The DSI has most often been used with data based on a special type of ordinal scale comprising a series of consecutive ranges of defined numeric intervals, generally based on the percent area of symptoms presenting on the specimen(s). Plant pathologists and other professionals use such...
With the rapid development of green building, it is important to check the energy and environmental performance of the green building post occupation. This paper focuses on how to evaluate the energy performance of a green building's cooling/heating source of the air-conditioning system post occupation. The operation of the cooling/heating system is checked to find out the problems and optimal control...
A kind of low sidelobe and high gain microstrip antenna array with 32×8 units operating in the X-band is designed, which achieves the gain of 28 dBi and the sidelobe level of −25 dB at 9.37 GHz. The Chebeshev distribution is used in designing the current distribution on the surface of this antenna, which achieves a width of main lobe of 5° in E-plane and a main lobe width of 10° in H-plane. The amplitude...
An average power sharing control strategy for parallel operation of voltage source inverter (VSI) based modular Uninterruptible Power Systems (UPSs) is proposed in this paper. The presented method is based on a modified droop control. The proposed method conquers the drawback of conventional droop plus virtual impedance control, and at the same time some challenges in the real applications have been...
Indirect rotor field oriented control (IRFOC) plays an important role in the high performance induction machine drives. In the indirect rotor field oriented control — based induction machine adjustable speed control system, the rotor field angle is usually obtained by the rotor angular velocity and the slip angular velocity. The rotor angular velocity can be sensed by an encoder with sufficient accuracy...
The paper firstly establishes a passivity-based control (PBC) of a double-fed inductor generator (DFIG). A new control method of the DFIG is proposed with the outer speed loop controlled by a full-order terminal sliding mode (TSM) controller to undertake maximum wind power point tracking (MPPT), while the inner current control loop is a PBC designed to manage the three-phase PWM rectifier. Simulation...
This paper presents a mixed three-level neutral point clamped (NPC) inverter with hybrid modulation method. It enables traditional Si devices and wide bandgap devices integration to reduce power loss and achieve high power density. Simulation results are firstly provided to verify the validity of the proposed approach.
This paper presents a hybrid multilevel inverter with DC bypass. Mixed modulation method is proposed to balance dc voltage, and enables Si devices & wide bandgap devices integration to reduce power loss and achieve high power density. Simulation results are firstly provided to verify the validity of the proposed approach.
Driver-in-the-loop and different human-machine goal consistency should be considered when designing driver-AFS interactive steering control system. In this paper, a novel design approach, namely dynamic game theory is used for the modelling of shared steering control between driver and AFS. Linear Quadratic dynamic optimization approach is used to derive the non-cooperative Nash, non-cooperative Stackelberg,...
In vacuum interrupters, anode spot formation is commonly known as a high-current anode discharge mode and it significantly decreases the current interruption capacity of the vacuum interrupters. To understand the mechanism of the anode spot formation, the heat flux density delivered to the anode is of vital importance. The objective of this paper is to determine the peak heat flux density at a transition...
Based on the single wheel vehicle model, a sliding mode variable structure control strategy with fractional exponential reaching law is proposed for the ABS control system. In this paper, the integral sliding mode surface is used to design the switching function, and the fractional exponential reaching law is designed by using the definition and properties of fractional exponential differential equations...
This paper presents a guidance law design for synchronized path following of multiple underactuated unmanned surface vehicles (USVs) without using a global reference velocity. Firstly, a distributed observer is proposed to eliminate the need of reference velocity known to all the vehicles. Secondly, a line-of-sight based guidance law is derived to force each vehicle to follow a parameterized path...
In recent years, the wireless body area network (WBAN) has become a heated topic in research, but its quality of service (QoS) has not received enough attention. The two operation modes of IEEE802.15.4 are analyzed, and the slotted CSMA/CA mechanism is found more suitable for the WBAN. With the simulation tool OPNET the network delays are proved to change in accordance with the parameter values of...
Supporting diverse services under a unified system is a major concern for the realization in the fifth generation (5G) cellular networks. In 5G systems, the massive connection property of massive machine-type communications (mMTC) results in the huge demand of physical downlink control channel (PDCCH) resources. Furthermore, greater overhead of PDCCH is indispensable for ultra-reliable downlink transmission...
Incorporating cognitive radio technology into wire-less sensor networks enables the sensor nodes to use the idle channels to meet their communication demands, but the spectrum sensing process inevitably brings extra energy consumption. Since cognitive sensor nodes are generally low-powered with limited batteries, we consider a novel spectrum sensing scheme with combined clustering and censoring for...
Modern scientific experimental facilities such as x-ray light sources increasingly require on-demand access to large-scale computing for data analysis, for example to detect experimental errors or to select the next experiment. As the number of such facilities, the number of instruments at each facility, and the scale of computational demands all grow, the question arises as to how to meet these demands...
For power semiconductor devices, such as IGBTs, MOSFETs and FRDs, a high area efficiency of the edge termination structure can enlarge the active area and thus improve the current capacity for a given chip area. In this paper, a double-sided edge termination (DSET) is proposed for the first time. Simulation results show that it can improve the breakdown voltage by about 42% without increasing the...
The marine industry is seeing an increasing number of vessels equipped with electric propulsion opposed to traditional mechanical propulsion. Electric propulsion has been shown to be advantageous in various land applications such as locomotives and road vehicles however in the marine setting the highly variable hydrodynamic load exposes the electric propulsion system to extreme load conditions. This...
Dual-active-bridge (DAB) DC-DC isolated converter is widely used in many applications e.g. power supplies, transportations and renewable power systems. In this paper, general modulation characterization and optimization of DAB converters have been analyzed and advanced modulation methods are proposed. Simulations and experiments are implemented to verify the effectiveness of the proposed modulation...
This paper presents a wind-driven DC power generation and control system modified by a doubly fed induction generator (DFIG), which stator is connected with a full-power diode rectifier to supply DC power to a stand-alone load and rotor is connected to the DC link with a PWM converter in charge of regulation of frequency and voltage on stator side. The transient character and behavior of current,...
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