مبدل DC-DC دو طرفه برای سیستم های انرژی تجدید پذیر

BULLETIN OF THE POLISH ACADEMY OF SCIENCES TECHNICAL SCIENCES Vol. 57, No. 4, 2009

S. JALBRZYKOWSKI, and T. CITKO

Abstract. To improve the energy quality, most of the renewable energy systems include an energy storage element charged by the bidirectional DC-DC converter. This paper proposes the bidirectional DC-DC converter which employs the two bridge configuration resonant class-E converters on the both sides of the isolating transformer. The low side converter is controlled as step up and the high side converter is controlled as step down. The proposed system is characterized by good dynamic properties and high efficiency because the converter transistors are switched in ZVS conditions. A theoretical analysis to provide relations for system design, and the laboratory model investigations to validate the system characteristic are given in the paper.

Key words: bidirectional, isolated, energy storage system, DC-DC converter.

واژه های کلیدی: دو طرفه، ایزوله، سیستم ذخیره انرژی، مبدل DC-DC.

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P2--A Comparison of Single-Phase p-q Theory and UVT Based Control Algorithms for Single-Phase UPQC

مقایسه تک فاز تئوری PQ و الگوریتم های کنترل مبتنی بر UVT برای UPQCتک فاز

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Yash Pal

Abstract— This paper employs a single-phase unified quality conditioner (UPQC), an integration of shunt and series active filters (APF), to perform voltage and supply current harmonics mitigation and power factor correction. Both the shunt and series APFs are realized using a single-phase, two leg voltage source inverter (VSI). For the series APF the control strategy is based on Unit Vector Template (UVT), while a comparison is made for the two control strategies namely UVT and single–phase p-q theory for shunt APF. In both of the control strategies the control is made over the fundamental supply current and fundamental supply voltage instead of the fast changing AFs current and voltage, thereby reducing the computational delay and number of required sensors. A dynamic model of the UPQC is developed in the MATLAB/SIMULINK enviournment and the simulation results demonstrating the power quality improvement in the system are presented for distorted supply and a combination of linear and non-linear load.

Keywords— Power Quality, UPQC, Harmonics, Power Factor Correction, voltage and current harmonic mitigation

واژه های کلیدی: کیفیت توان، UPQC، هارمونیک ها، اصلاح ضریب قدرت، ولتاژ و کاهش هارمونیکهای جریان

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P3--A New Approach for High Efficiency Buck-Boost DC/DC Converters Using Series Compensation

رویکرد جدید برای بهره وری بالا باک ، بوست در مبدل DC / DC با استفاده از جبران سازی سری

Jun-ichi Itoh

Abstract - This paper proposesanew buck-boost DC/DC converters, which is connected in series to the power supply. The proposed circuit provides only differential voltage between the input voltage and the output voltage command. The power rating of a conventional circuit is dominated by the input voltage or the output voltage. In contrast, the voltage rating of the proposed circuit requires only the differential voltage between the input and output voltage. In addition, the series converter generates a positive and negative voltage to realize boost mode and buck mode, respectively. As a result, the power rating of the DC/DC converter can be drastically reduced. A new approach for series compensation converters is introduced in order to realize high efficiency and a reduction of power rating. Two new buck-boost converters and their control methods are proposed based on a new concept in which the proposed circuits consist of an Hbridge circuit and a power assist circuit. The H-bridge circuit is used in order to determine the polarity of the differential voltage. The power assist circuit controls the DC voltage of the H-bridge circuit depending on the output voltage command. In the proposed circuit, a flyback converter and inverting chopper are used as the power assist circuit. Simulation and experimental results are shown in order to demonstrate the advantages of the proposed converters in comparison with a conventional buckboost converter. A maximum efficiency of 98% was obtained with the proposed circuit. The proposed circuits can decrease losses by 2/3 in comparison with a conventional buck-boost converter. Therefore, the proposed converter can realize high efficiency and down-sizing in applications that require the output voltage to be closed to the input voltage.

Index DC/DC converters, High efficiency, battery applications, flyback converter, inverting chopper

شاخص: مبدل DC / DC، راندمان بالا، باتری برای حالات کاربردی، مبدل FLYBACK، چاپر معکوس

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P4--A New Approach to Sensorless Control Method for Brushless DC Motors

یک روش جدید به روش کنترل بدون سنسور برای موتورهای بدون جاروبک DC
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Tae-Sung Kim, Byoung-Gun Park, Dong-MyungLee, Ji-Su Ryu, and Dong-Seok Hyun

International Journal of Control, Automation, and Systems, vol. 6, no. 4,pp. 477-487, August 2008

Abstract:This paper proposes a new position sensorless drive for brushless DC (BLDC) motors. Typical sensorless control methods such as the scheme with the back-EMF detection method show high performance only at a high speed range because the magnitude of the back-EMF is dependent upon the rotor speed. This paper presents a new solution that estimates the rotor position by using an unknown input observer over a full speed range. In the proposed method, a trapezoidal back-EMF is modelled as an unknown input and the proposed unknown input observer estimating a line-to-line back-EMF in real time makes it possible to detect the rotor position. In particular, this observer has high performance at a low speed range in that the information of a rotor position is calculated independently of the rotor speed without an additional circuit or complicated operation process. Simulations and experiments have been carried out for the verification of the proposed control scheme.

Keywords:BLDC motor, full speed range, sensorless control, unknown input observer.

واژه های کلیدی: موتور BLDC، محدوده سرعت کامل، کنترل بدون سنسور، مشاهده گر ورودی ناشناخته .

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P5--A New Control Strategy for Bi-Directional DC-DC Converter in Electrical Vehicle

یک استراتژی کنترل جدید برای تبدیل دو جهته DC-DC در برق خودرو

Zhang Xuhui

Abstract –In order to improve the drive system efficiency，a boost/buck bi-directional DC-DC converter which can regulate the DC-link voltage according to optimal efficiency curve is added between the battery and the traditional voltage source inverters (VSI) supplying a motor. The traditional control approach for the bi-directional DC-DC converter is based on the analog control concept. However, it is not the best choice in digital control environment. In this paper, a new control strategy with a digital control concept is presented which can achieve a smooth switching between the boost and buck operation state using only one controller. The small-signal model of the controller is built and the relationship between the out power and the DC-link voltage stability is discussed. The PMSM drive system in electric vehicles (EV) is modeled using MATLAB/simulink and a operation condition in EV is simulated to verify the above theoretical analysis. The simulation and theoretical analysis results match with good agreement.

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P6-- A New Model of Economic Dispatch Considering Energy Conservation and Environmental Protection in Electricity Market

مدل جدید اقتصادی پخش بار با توجه به حفاظت انرژی و حفاظت محیط زیست در بازار برق

Yantao Wang

2012 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of Hainan University

Abstract

The power syste

تلفن :	منقضی شده
منطقه :	استان تهران
آدرس :	استان تهران - بومهن

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