Converter losses play a crucial role in the process of power converter design. Especially semiconductor components and heat sink selection are strongly dependent on the total power converter losses and thus affect the...
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Converter losses play a crucial role in the process of power converter design. Especially semiconductor components and heat sink selection are strongly dependent on the total power converter losses and thus affect the power converter size and its price. The most popular techniques for determination of the losses are based on the computer simulation of the power converter. These kinds of simulations could be very time consuming, because on one side, the simulation needs very short step-time for differential equations calculation to model power converter switching. On the other side, the temperature dynamics of heat sink are commonly slow and depend on power cycles of converter. With the help of FPGA-based hardware in the loop (HIL), the simulation could run real-time and it is possible to test different scenarios, different modulation techniques and see their influences on converter losses. This approach can lead to reduction of losses to the state, when it is possible to reduce the size of converter. Furthermore, the HIL simulation could be used for testing and developing control algorithm in real time conditions. It also offers flexibility in the easy change of model parameters and monitoring values which are not or hardly obtainable in real machine. This paper presents the FPGA-based HIL simulator of induction motor drive with three phase voltage source inverter based on Semikron IGBT modules.
This paper analyzes the potential benefits in terms of fuel consumption and NOX emissions of an optimized speed trajectory in a real driving situation. The speed management of the vehicle is approached as an optimal c...
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This paper analyzes the potential benefits in terms of fuel consumption and NOX emissions of an optimized speed trajectory in a real driving situation. The speed management of the vehicle is approached as an optimal control problem, based on a simplified vehicle model supported by experimental measurements. This optimal control problem is addressed twice on a daily commuting route: one for minimum fuel consumption and another for minimum NOX emissions. These speed trajectories are followed in a vehicle test bench, simulating the actual road conditions, with a fully instrumented vehicle. The experimental results are compared to the way two different drivers perform the same route in the same amount of time with their own natural driving styles. Optimal results demonstrate that optimal speed trajectory is strongly dependent on the minimization objective (either fuel or NOX), and that reductions around 4% in fuel consumption and 35% in NOX emissions were possible in the testing route compared to intuitive human driving styles. (C) 2018, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.
Nowadays, a large scale of renewable energy sources has been connecting to power system and the real time simulation platform is widely used to carry out research on integration control algorithm, power system stabili...
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Nowadays, a large scale of renewable energy sources has been connecting to power system and the real time simulation platform is widely used to carry out research on integration control algorithm, power system stability etc. Compared to traditional pure digital simulation and hardware in the loopsimulation, power in the loopsimulation has higher accuracy and degree of reliability. In this paper, a power in the loop analog digital hybrid simulation platform has been built and it can be used not only for the single generation unit connecting to grid, but also for multiple new energy generation units connecting to grid. A wind generator inertia control experiment was carried out on the platform. The structure of the inertia control platform was researched and the results verify that the platform is up to need for renewable power in the loop real time simulation.
Applications for SIL and HIL testing in design, verification, and validation of marine systems are expected to increase. With this in view the concept for a mobile simulation system is presented, which aims at enhanci...
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Applications for SIL and HIL testing in design, verification, and validation of marine systems are expected to increase. With this in view the concept for a mobile simulation system is presented, which aims at enhancing factory and on board simulation based testing. A modular network based system architecture is proposed providing: real-time process simulation, hardware interfaces, test tools, a mobile bridge console, and 3D-visualization. For the purpose of flexible solutions a modular and scalable approach to simulating ship motion in six degrees of freedom is incorporated. Finally preliminary modelling and simulation results from the current design stage are presented. (C) 2018, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.
The demand for high voltage, high power, high precision and high dynamic 3AC-voltage sources is increasing constantly. One application that gets more and more important in recent years and demands such voltage sources...
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The demand for high voltage, high power, high precision and high dynamic 3AC-voltage sources is increasing constantly. One application that gets more and more important in recent years and demands such voltage sources is e.g. Power-hardware-in-the-loop (PHIL) Emulation. In this paper a new power converter topology called "Parallel Hybrid Converter" or PHC is presented and a corresponding control scheme is derived. This new converter has a terminal behavior similar to a MMC or MMPMC but compared to them the PHC features significantly reduced costs and a significantly improved power density.
This paper presents a set of rotating machine models, namely synchronous, asynchronous and permanent magnet synchronous machines, with increased stability characteristics compared to traditional state-space based meth...
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ISBN:
(纸本)9781538653388
This paper presents a set of rotating machine models, namely synchronous, asynchronous and permanent magnet synchronous machines, with increased stability characteristics compared to traditional state-space based methods. In this work, the machine models are all derived using the state-space-nodal (SSN) theory. This results in machine models that are stable without any parasitic load or numerical snubber. This is an important improvement for these models in solver packages based on the state-space approach, such as SimPowerSystems or PLECS.
Vehicle drivers are exposed daily to harmful low-frequency vertical vibration over the frequency range of 1-20 Hz. This reduces ride comfort and safety as well as possibly causing long-term harmful effects on human he...
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Vehicle drivers are exposed daily to harmful low-frequency vertical vibration over the frequency range of 1-20 Hz. This reduces ride comfort and safety as well as possibly causing long-term harmful effects on human health in the form of lower back pain and driver fatigue. Accordingly, intensive work has been undertaken in this field on active seat suspension systems that have superior performance over a wide frequency range compared with passive and semi-active systems. One of the main features of these systems is the control strategy that is used to generate the demand control force and whilst many control strategies have been investigated in this area; their practical implementation is challenging as they require unavailable or expensive system states. Hence, in this thesis, a novel and cost-effective strategy has been developed that uses measurable and inexpensive displacement and velocity preview information from the vehicle suspension. In addition to these practical advantages, employing a prior knowledge of the disturbance in the control strategy increases the ability of the active seat to react rapidly to disturbances and hence provides a supplementary improvement to the vibration attenuation performance. The potential application of this strategy for an active seat suspension is investigated through both simulation and experimental tests. Firstly, for simplicity, the control force is defined from this suspension preview information based upon a linear control approach, with optimum gains using an integrated simulation model of a linear quarter vehicle model (QvM) and one degree of freedom of seat suspension. These gains are obtained off-line by optimising ride comfort in terms of the vertical Seat Effective Amplitude Transmissibility (SEAT) factor using a genetic algorithm (GA) and considering the physical constraints on both the limited seat suspension travel and actuator force capacity. The experimental tests are performed using a prototype active seat sus
This research paper is focused at the study and implementation of various protection relays and schemes in LabVIEW software for a small power system. The test power system is indigenously developed in the Lab. Hardwar...
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ISBN:
(纸本)9781538682043
This research paper is focused at the study and implementation of various protection relays and schemes in LabVIEW software for a small power system. The test power system is indigenously developed in the Lab. hardware implementation is performed by using common modules available in laboratory, whereas interfacing is done by using LabVIEW. Various types of prototype relays are designed and tested for different faults. Performance of hardware relays and LabVIEW designed relays have been investigated. Individual LabVIEW designed relays are tested for real faults through hardware in the loop (HIL) simulation. A complete protection scheme of relays is designed for a simple 4-bus parallel-line meshed network. Real-time results for various faults at different buses show that the proposed scheme is accurate and fast.
Power converters are used for grid integration of renewable sources that can achieve certain objectives through system control. Finite state - model predictive control (FS-MPC) is one of the techniques used for the gr...
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ISBN:
(纸本)9781728116129
Power converters are used for grid integration of renewable sources that can achieve certain objectives through system control. Finite state - model predictive control (FS-MPC) is one of the techniques used for the grid integration of voltage source inverter (VSI) and possessing distinctive features such as fast dynamic performance and ability to incorporate constraints inherently. However, system development is one of the concern for FS-MPC due to computational delay problem. Field programmable gate array (FPGA) based system development is a way to tackle the mentioned problem because of its parallel processing nature. In this paper, FS-MPC is presented for three-phase grid-connected VSI system using modeling-based digital system design approach that is advantageous for analysis, easy debugging and FPGA-based system development. The integrated platform of MATLAB-Simulink and system generator is used for modeling and hardware-in-the-loop (HIL) simulation to validate the system.
In aerospace engineering, experimental testing is mandatory for certification. In case of assembled structures, the interaction of dynamic loads between substructures largely determines the overall dynamic behavior. H...
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ISBN:
(纸本)9789073802995
In aerospace engineering, experimental testing is mandatory for certification. In case of assembled structures, the interaction of dynamic loads between substructures largely determines the overall dynamic behavior. However, testing of large assembled structures is not always feasible or may be unreasonable from economic considerations. hardware-in-the-loop (HIL) simulation is a testing technique based on dynamic substructuring of large assembled structures, where one part of an assembled structure is available as hardware while the remaining part is represented by a simulation model. The interaction between the virtual and the physical substructure requires the measurement of interface forces and the emulation of interface motion using a dedicated test facility. In this paper, the feasibility of HIL is investigated using a six-axis hydraulic shaking table. The theoretical foundation for HIL is reviewed and the critical factors for the success of HIL are being discussed. An exemplary application is presented.
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