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Conventional sliding mode control (SMC) is so-called robust to the system uncertainty and the external disturbance, however, it requires the knowledge about the upper bound of uncertainties and external disturbances. In the practical system, uncertainties and external disturbances are often unknown. A adaptive backstepping sliding mode controller (ABSMC) is proposed to deal with the uncertainty in...
A novel voltage equalizer called Multilevel Architecture is proposed for series-connected photovoltaic (PV) system to prevent negative influence of mismatch issues. This undesirable mismatch triggers multiple power maxima in PV string P-V characteristics, encumbering maximum power points tracking (MPPT) algorithms. This paper designed a control scheme for isolated-port flyback converter operating...
A novel space vector PWM (SVPWM) strategy is proposed in this paper to balance the neutral-point voltage (NP) and the floating capacitor voltage for five-level active neutral-point-clamped (ANPC) converter. There are two different switching sequences in each small area. According to the NP offset, different switching sequences are used to control the NP voltage. Since the charge-discharge of the floating...
In this paper, the dynamics of the half-bridge LLC resonant converter are investigated based on the small signal model and a piecewise PI regulation is studied and derived by simulation. Small-signal dynamics of the circuit under consideration contain many factors that may affect regulation accuracy and performance of digitally controlled regulators. The load factor is specifically addressed here...
In the context of Software-Defined Networking (SDN), various sophisticated policy-aware network functions such as intrusion detection, access control and load balancer, can be realized via specified middlebox devices. However, high congestions may occur in specific bottleneck links if middlebox selection and traffic routing are not well jointly planed. To this end, we study a joint optimization of...
Hybrid modeling method provides a natural way to model the power converter, it describes the behavior of the converter more accurately in sense of no approximation. The switching control method based on the hybrid model can realize the stable regulation of the output voltage. However, the switching controller designed based on the common Lyapunov function (CLF) would lead to steady state error, when...
We present a simplified Mixed Logical Dynamic (MLD) model for DC-DC Boost converter using less number of binary variables and continuous variables. A constrained optimal problem is formulated and solved based on Model Predictive Control (MPC) using the simplified MLD model. The optimized switching signal derived by the MPC regulates the output voltage. The MLD modeling of the converter is accurate...
Non-thermal plasma is a promising technology for the generation of ozone and removal of exhausted fuel gases. Energy efficiencies become more and more important in many industry applications. Discharge excited by nanosecond pulsed power is said to be one of the most efficient method1,2. In this study, a compact 4 stages stacked blumlein pulse forming line based power source will be introduced to generate...
With various cloud services emerging in data center networks, network congestion and load imbalance are seriously caused by elephant flows. To resolve this problem, a load balancing mechanism based on software defined networking (SDN) for elephant flows is proposed. The mechanism obtains the topology and status of the entire network via global view of SDN. Then it splits and sends elephant flows through...
In order to overcome the excitation problem of three-stage synchronous machine(TSM) used as starter for the engine cranking, this paper presented a novel three-phase open-winding structure of the exciter for the proposed machine with the dual-inverter for supplying the integrated AC and DC excitation power. The operation principle of the dual-inverter and the control method of the three-phase AC excitation...
This paper mainly discusses a design method of the sliding mode variable structure controller based on fuzzy logic scheme for a position servo system, which contains nonlinearity and uncertainty. In order to accelerate the reaching phase and reduce chattering, the exponential approach law is adopted as the control function. Simulation results show that the new control algorithm exhibits the better...
This paper puts forth a straw man proposal for future diverse internets. Guided by a principle that we call Align-and-Decouple (AD), our AD protocol architecture design calls for lightweight transport protocols that allow for decoupled operation of networks that are either owned by different organizations, or are networks of different types/protocols. TCP's fragmentation and congestion control mechanisms...
A new design approach of the sliding-mode variable structure controller basing on the eigenvector of the specific area is presented for the position tracking servo control system in this paper. In order to accelerate the reaching phase and reduce chattering, the exponential approach law is adopted as the control function. Simulation results show that the new control algorithm exhibits the better control...
Vibration and noise are the fetters which restrict the development of switched reluctance motor drive; this paper presented a new rotor structure which mitigates motor's vibration and noise effectively. Based on the permeability theory, set holes on the rotor without filling materials in order to reduce the magnetic flux at the aligned position, further more, reduce the radial force amplitude from...
Switched reluctance motor drive system becomes an attractive alternative in adjustable speed drive due to its simplicity in both motor construction and power converter, and vibration that resulting acoustic noise in switched reluctance motor have generated intense interest from the time it became commercially competitive with dc and ac drives. Focus on the magnetic noise vibration, dig the relationship...
Vibration and acoustic noise are the important reasons for switched reluctance motor to be unacceptable in variable speed drive market. To optimize the physical structure of the motor and to choose the appropriate control strategies are the two conventional ways to reduce the noise. In this paper, a new method is proposed to combine these two optimization ways together: harmony optimization of switched...
This paper presents a method for evaluating the dynamic characteristics of AC contactors. A single AC contactor is tested and the parameters which closely interrelated to the important performance of the AC contactor are obtained specialized with the closing process. The method is to deal with fuzziness to combine these dynamic parameters which affect the contact's dynamic response into one index...
In wireless sensor networks, object tracking is one of the important topics in research of wireless sensor networks. However, the core technology of object tracking is the positioning technique. In recent years, many positioning methods have been proposed. The main purpose of this paper is to achieve an object tracking mechanism with low complexity of computation and low cost based on various constraints...
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