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Electric water heaters have been regarded as a load to be exploited in residential energy management applications due to their potential energy storage capacity. Nevertheless, the implementation of control strategies for water heater systems requires high-performance models which must be capable of reproducing a water heater's internal operation dynamics, especially their inner water temperature variations...
The interleaved converter has may advantages such as low power losses and small output current ripple. The output current ripple of interleaved converter is the key parameter for the filter inductor design and the overall converter optimization. In this paper, the output current ripple behavior of interleaved Buck converter is analyzed, both in CCM and DCM. Further, a simplified numerical method for...
In order to obtain an effective control range analysis method of different capacitor voltage balancing control strategies, this paper proposes a control range analysis method based on virtual loss difference resistance model. In this paper, the virtual loss difference resistance model is established on the submodules of cascaded converters. The control ranges of several conventional capacitor voltage...
Dead-time effect of dual active bridge (DAB) DC-DC converter is usually out of consideration in traditional optimized strategies, causing the deviation of the theoretical and actual results. In this paper, the current stress model of DAB with dead-time effect is given, and combining the transmission power model, a current-stress-optimized strategy is proposed. Meanwhile, the corresponding control...
To avoid large overvoltage when the current of the dc-link inductor is interrupted, overlap time is added to the drive signals in current source converters, which results in the extra harmonic in grid current. Waveforms of AC side current before and after added overlap time are achieved from analysis of the current commutation process. The expression of overlap current is given according to the pulse...
This paper, we propose IM (Integrated Magnetics) structure for LLC resonant converter. The IM technique can combine several components into one magnetic core, plus, utilizing a planar magnetic core is a suitable device to achieve high power density. Therefore, it can achieve high power density in Switch Mode Power Supply (SMPS) because the total volume is almost determined by the magnetic components...
A resistance- or inductance-based saliency is needed as a prerequisite for signal-injection based encoderless position estimation methods. The differential quantities can be influenced by applying a short-circuited electrical winding on the rotor of an electrical machine. For a configuration that has been optimized in former research, 2D finite element method simulations are carried out. To be able...
Due to a strong appealing for environment protection and energy saving, electric vehicles (EVs) receive more attention nowadays. Those equipped with permanent magnet synchronous in-wheel motors (PMSIMs) are regarded having an efficient structure that can transmit electrical energy to mechanical energy directly. To optimize vehicle performance, a new energy management strategy is proposed in this work...
In this paper, a generalized method is proposed to predict the output of a typical wind farm with a multi-state probabilistic model. The impacts of ice coating on the wind farm power output (WFPO) on reliability is evaluated in detail. Based on the analysis of the data sets of ice coating loss from the wind farms located in Guizhou, the southern mountainous area in China, the WFPO model is modified...
The key to realize the low-voltage ride-through (LVRT) of the permanent-magnet synchronous generator (PMSG) is to maintain the DC-link voltage within its acceptable range. By introducing the DC-link voltage to the outer-loop power control of the machine-side converter (MSC), the PMSG may actively adjust its active power output to reduce the DC-link voltage deviation. Given the comparatively slow response...
In this paper, a simple three-phase bridge circuit is adopted to realize the energy feedback for BLDCM driven flywheel energy storage system (FESS) to avoid the additional control or drive circuit problems. The energy feedback is a key to realize the energy exchange, which is affected significantly by the PWM modulation method. The energy feedback principle is analyzed to determine the suitable PWM...
The accurate modeling of electrochemical batteries has to be considered a significant issue in the design of control algorithms applied to energy storage systems. In this paper, a comprehensive analysis of Energy Storage System models based on equivalent electric circuits is presented. Such models are compared by means of a multi-criteria approach considering performance, applications, battery technologies...
Limited travel constrains the widely application of XYZ parallel micro/nano-positioning stage. In this paper, a novel parallel-kinematics micro/nano-positioning stage is proposed with the goal of enlarging the travel range. In order to obtain a large input displacement for actuating the stage, voice coil motors (VCM) are adopted. For a large-travel parallel stage, the cross-axis motion increases the...
Discrete time-varying problems are frequently encountered in mathematics and engineering fields, such as numerical analysis, signal processing and computer computing. However, conventional algorithms mainly solve time-invariant problems. Employed for discrete time-varying problems solving, conventional algorithms may generate quite large and unacceptable lagging errors. In this paper, discrete time-varying...
Presently, many industries are facing strong challenges related to the demand of customized and high-quality products. These pressures lead to internal company's conflicts where current production systems have a rigid structure, forcing the company into a organization stall when a fast product change is required. Therefore, the need to smoothly migrate traditional systems into more feature-rich and...
This paper presents a design method for domestic induction systems whose winding is considerably farther from its load. To this end, a parametrized finite element model is used to ascertain the system's parameters. This model is used to test variations in frequency, inductor-load distance and inductor diameter. From simulation results, efficiency, output power, power loss volumetric density and near...
The multiplex 3-phase winding motors suffer from the problem of the magnetic coupling between the normal winding and the fault winding. To investigate the behaviors of the dual-winding PMSMs on the short-circuited fault conditions, a fault analysis model is developed that includes a dual-winding PMSM circuit model with a short-circuited fault coil within some phase coil and an inverter model with...
Digitalization and Industry 4.0 create new opportunities and challenges in production and logistics. This also applies to methods for process modelling and analysis. The following paper discusses the possibilities, chances and limitations of the value stream method in this context. For this purpose, requirements regarding process modelling and analysis in digitalization and Industry 4.0 have been...
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...
With the increasing penetration of distribution generations (DGs), the stability problems of the power system become more and more serious. Virtual synchronous generator (VSG) as an effective solution, can improve the converter inertia, but there is still possibility of power oscillation due to the small line impendence ratio R/X. In this paper, a small signal dynamic model is derived for the second-order...
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