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This paper presents a new single inductor Dual Input-Dual Output dc-dc converter for a standalone hybrid energy system. The converter has two unidirectional ports, one bidirectional port for storage element and one output port. The converter operates in dual input-dual output mode, dual input-single output mode and single input-single output mode. Both the input sources can power up the load individually...
The perspective of Smart Grid developments brings a picture with active distribution networks having many distributed resources such as PV connected to the grid through inverters. The challenge for this future is so complex that the Smart Grid Coordination Group (SG-CG) is already considering for standardization in the new Use-Case cluster "Connect and active actor to the grid", the high...
Maximum efficiency of induction generators is a significant issue of renewable energy applications since resource is limited and sometimes because of expensive technology. This paper presents a modeling method of iron, copper and mechanical losses in an induction machine based on the design of experiments and Taguchi orthogonal plans. The model involves several parameters such as rotor speed (slip),...
In this paper, an optimal power flow problem is formulated in order to minimize the total operation cost by considering real-time pricing in DC microgrids. Each generation resource in the system, including the utility grid, is modeled in terms of operation cost, which combines the cost-efficiency of the system with the demand response requirements of the utility. By considering the primary (local)...
This paper presents a 25kW six-level Modular Multilevel Converter prototype. The designed prototype is an industrial power converter that can be used by the industry. The converter is shown together with a high-performance hardware platform control designed for large multilevel converters. The hardware platform is a custom platform based on Zynq-7000 System-On-Chip that provides high processing performance...
This paper presents a direct torque control drive system utilizing constant switching frequency controller (CSFC) with EKF based speed estimation. By employing CSFC instead of the conventional hysteresis controller, the torque ripple is reduced and constant switching frequency is achieved, and more importantly, the simple structure of DTC without any modification to the look-up table is maintained...
Earlier, Chao pioneered the very first closed-form solution of the number of reachable and other states for marked graphs (MG) and k-th order system which is the first step that allows the exponential computation time for reachable states of a particular Petri Net to be reduced within intra-second! Basing on this contribution, instead of by first-met bad marking (FBM), here we propose a new concept...
Most diagnostic techniques in the literature focus on the occurrence of a single fault, which limits their functionality. This paper presents a real-time diagnostic algorithm for multiple IGBT open-circuit faults in three-level Neutral-Point-Clamped converters. The proposed algorithm is based on an indirect analysis of the converter pole voltage errors and requires no additional sensors, relying only...
This paper deals with the behavior of DFIG under normal and abnormal condition of grid based on the parameters of DFIG such as power flow, stator and rotor current and DC link voltage. The stator side, rotor side and DC link are realized by their equivalent circuit for analysis under normal and dip condition. It is observed that during abnormal condition there is unbalance in stator and rotor current...
Full Energy Booster injectors for Storage rings are complex systems and somewhat reduced versions of the ring itself. They provide accelerated electrons that usually have the same energy of the storage ring accumulated beam. Power converters used to deflect, focus and defocus the electron beam in the booster must carefully follow a waveform both in time and in current values, as it is mandatory to...
This paper reports relations between force control performance and output direction at an end-effector of a limb when a human apply force to a rigid object. A highly backdrivable rehabilitation supporting system is used to provide an evaluation program. It is also used for repetitive force sensing. Measurement on twelve seated subjects can quantify force control accuracy when the subjects try to output...
In this paper, we optimize a hybrid energy storage system that includes a supercapacitor and a battery storage system for economical dispatching of the intermittent wind power source. In the optimal hybrid energy storage system, based on the technical merits of each storage, the supercapacitor is used to compensate a short-term wind power fluctuation, whereas the battery plays as a long-term one to...
This paper presents a mathematical model which describes the behavior of the electric arc in power circuits. The arc is studied like a circuit component. Arc equations are analyzed for static and dynamic situations to define a small signal model. Simulation results and experimental results are given for common arc ignition cases.
Within this paper a modeling, identification and control technique for an antagonistically actuated joint consisting of two pneumatically actuated muscles is presented. The antagonistically actuated joint acts as a test bench for control architectures which are going to be used to control an exoskeleton within a telerobotic system. A static and dynamic model of the muscle and the joint is derived...
Current source modular multilevel converter (CSMMC) is a potential topology for the high-power applications with low-voltage and high-current requirements. One of the most challenging issues associated with the CSMMC is the submodule inductor currents imbalance if it is not properly controlled. This paper presents a control method for submodule inductor currents balancing in a CSMMC. The control method...
A new twelve level three-phase inverter topology based on a computing model that can pre-calculate switching angles is proposed. The main advantage of this topology is that the number of input DC voltage sources, power electronic switches, pre-calculated switching angles, and the total harmonics distortion in the output voltage are all reduced. This means that the topology can be connected to the...
This paper proposes an energy management for fuel cell electric vehicle taking into account the fuel cell degradation during its lifetime. The aim of the study is to design a control strategy which manage a power converter in order to use the fuel cell system as a range extender by preventing the batteries state of charge to drop too quickly. The presented controller use both batteries state of charge...
Manual tasks in industrial production are often monotonous, leading to a decrease in concentration and motivation of the worker and thus to deficiencies in the products. With quality as well as performance requirements getting more and more stringent, workers need additional support by their work environment. We developed a novel approach providing worker assistance and inline quality assurance for...
Constant power load converter will introduce unstable factor to the cascaded system. Exchanging the position of constant power load converter as the source converter can improve system stability. Active solutions to modify the negative impedance of constant power load converter can also make the system more stable. The concept of coordinative front-to-end impedance control is proposed in this paper,...
This paper presents an overview of researches on power system stability with high wind power penetration including analyzing methods and improvement approaches. Power system stability issues can be classified diversely according to different considerations. Each classified issue has special analyzing methods and stability improvement approaches. With increasing wind power penetration, system balancing...
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