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EPE Journal Volume 24-3 - Papers
- Electrochemical Double Layer Capacitors (supercapacitors) Ageing Impacts and Comparison on Different Impedance Models
- General Purpose Adaptive and Nonlinear Controller Design for DC-DC Converters in Discontinuous Conduction Mode Operation
- The Accuracy Improvement of Electric Machine Digital Control System based on a Novel Speed Regulator
- A Low-Cost and Simple Control Approach for Two-Phase Induction Motors at High Speeds
- Energy Efficiency based Design Criteria for Pump Drive Systems
- Adaptive Droop for Primary Control in MTDC Networks with Energy Storage
EPE Journal Volume 24-3 - Editorial
By Frédérick Bordry; Alfred Rufer; Jean-Paul Burnet; Drazen Dujic
It is our pleasure to welcome you to the 17th Conference on Power Electronics and Applications, EPE’15-ECCE Europe, which will take place in Geneva, Switzerland from 8th to 10th September. With dates approaching, all is set for another gathering of power electronic experts from all around at the world, at the largest European event of this kind.
EPE Journal Volume 24-3 - Papers
By R. German; P. Venet; A. Sari; O. Briat; J.M. Vinassa
Electrochemical Double Layer Capacitors (EDLC) are energy storage devices known for their higher lifetime and higher power density than batteries. They use double layer electrostatic effect between ionic and electronic charges. This articles deals with impedance models used for EDLC modeling. Firstly this article presents EDLC ageing causes through a literature review. Then it is shown by experimental results that ageing mainly affects EDLC impedance. Secondly the article presents the classical models used for EDLC impedance modeling (single pore model, CPE model) with the physical meaning of their parameters. The newest model called multipore model (MP) allows to classify porous structure EDLC by pore time constants. Then every impedance models are compared in term of fitting precision with experimental results.
By Mahdi Salimi; Adel Zakipour
In this paper, a general purpose adaptive nonlinear controller is designed for DC-DC converters which is robust and stable against the converter load changes, input voltage variations and parameter uncertainties. Due to non-minimum phase nature of boost and buck-boost converters, the output voltages of these converters are indirectly controlled by tracking the inductor current. The inductor reference current is generated by a variable structure PI controller which regulates the converter output voltage. Using MATLAB/Simulink toolbox and a stand-alone TMS320F2810 Digital Signal Processor (DSP) from Texas instruments, some simulation and practical results are presented to verify the capability and effectiveness of the proposed general purpose control approach.
By Haihong Shi; Xiaolin Wang; Zhiquan Deng
The accuracy of the speed calculation is generally reduced if the speed calculation is performed at a slower control sampling rate. In this paper, a novel speed regulator is proposed to solve the contradiction of the speed loop fast adjustment and measurement error. Firstly, the measurement speed at each control period is calculated through the differential algorithm of position signal. Then the output of the speed controller is analyzed quantitatively. Base on this, change the speed controller structure to improve the integral effect by using the position feedback directly instead of the original integral item of the PI regulator, so as to avoid the error and delay caused by the process that the position signal differential and integration. Secondly, a speed detection method by period moving average is employed to improve the continuity of the speed feedback. Finally, simulations are used to verify the performance of the proposed speed regulator. Furthermore, experiments are conducted using a surface permanent magnet synchronous machine to compare the performance of the traditional speed controller and the proposed speed regulator for variable speed operation. Both the simulation and experimental results show the improvement of dynamic and steady state performances of the proposed speed regulator.
By Saleh Ziaeinejad; Younes Sangsefidi; Ali Mehrizi-Sani; Hamidreza Pairodin-Nabi; Abbas Shoulaie
This paper proposes a method to control two-phase induction motors using a two-leg inverter. This method represents superior dynamic behavior and is suitable for the field-weakening region and high speed applications. In the proposed Approximate Stator Flux Control (ASFC) method, mechanical sensors and current transducers are not required. Therefore, the implementation cost of ASFC drives is comparable with the conventional scalar control drives. In the ASFC method, a switching table controls the rotating field speed of the motor by adjusting its stator flux modulus. The relationship between the stator flux modulus and rotating field speed is derived. The average switching frequency of an ASFC drive is also derived. This parameter is controlled by the ASFC drive. Via simulation and experimental case studies, high-speed operation of a two-phase ASFC drive is compared with the performance of a conventional scalar drive in start-up and steady state conditions. The validity of the presented equations required to control two-phase induction motors is also demonstrated.
By J. Schützhold; K. Benath; V. Müller; W. Hofmann
The conventional design of pump drive systems usually focuses on their mechanical parameters. In this paper, this design is reconsidered aiming at an improved energy efficiency. To this end, it is essential to consider the entire electromechanical system – beginning with the fluid to be pumped and ending with the electrical power supply. All these system components are modeled in order to estimate the losses at various operating points – especially in partial load conditions. These models are based on freely available data-sheet parameters. Hence, the criteria presented in this paper can be applied directly in an early stage of the design process in order to find suitable drive configurations. Regarding energy efficiency, pump drive systems can be classified with respect to two fundamental design categories: the control method such as throttle or speed control and the drive configuration such as single or cascaded pump drives. In order to realize the full energy saving potential, this paper presents a guide for choosing an appropriate design option. This guide includes a set of design criteria and a selection diagram that enables fast concept decisions for energy efficient pump drives.
By Catalin Gavriluta; Ignacio Candela; Alvaro Luna; Joan Rocabert; Pedro Rodríguez
Multi-Terminal DC (MTDC) systems are drawing a lot of interest lately in applications related to distributed generation, especially in those that integrate wind or PV systems together with energy storage. This paper proposes an improved strategy for the primary control of MTDC integrating energy storage (ES) units. The concept is based on the combination of a droop control method and DC-bus signaling in order to provide a generic approach to be used as basis for a hierarchical control structure in a multi-point DC-bus system. The proposed method considers the State of Charge (SoC) of the energy storage system at the primary control level, yielding a surface characteristic for a droop control that depends both on the SoC and the DC-bus voltage. Finally, a method for designing and tuning the system is proposed and analyzed theoretically and through simulations and experiments on a 10 kVA system with energy storage.
EPE Journal Volume 24-3: Other
By B. Sneyers
The In Memoriam of Jean-Claude Sabonnadière, written by B. Sneyers.
By B. Sneyers
Announcement of the new book: Gestion et valorisation du stockage de l’énergie dans les réseaux électriques / Energy Storage in Electric Power Grids, written by Benoît Robyns, Bruno Francois, Gauthier Delille and Christophe Saudemont