• Journal of Electrical Engineering and Technology
• /
• 제6권3호
• /
• pp.375-383
• /
• 2011

This paper describes a real-time hardware simulator for a grid-tied Permanent Magnet Synchronous Generator (PMSG) wind power system, which consists of an anemometer, a data logger, a motor-generator set with vector drive, and a back-to-back power converter with a digital signal processor (DSP) controller. The anemometer measures real wind speed, and the data is sent to the data logger to calculate the turbine torque. The calculated torque is sent to the vector drive for the induction motor after it is scaled down to the rated simulator power. The motor generates the mechanical power for the PMSG, and the generated electrical power is connected to the grid through a back-to-back converter. The generator-side converter in a back-to-back converter operates in current control mode to track the maximum power point at the given wind speed. The grid-side converter operates to control the direct current link voltage and to correct the power factor. The developed simulator can be used to analyze various mechanical and electrical characteristics of a grid-tied PMSG wind power system. It can also be utilized to educate students or engineers on the operation of grid-tied PMSG wind power system.

• 한국통신학회논문지
• /
• 제23권8호
• /
• pp.2120-2130
• /
• 1998

본 논문은 네트워크를 기반으로 한 객제 지향형 영상 처리를 하는 프로그램이 가능한 MPEG 디코더 설계를 다룬다. 설계된 MPEG 디코더는 객체 지향형 프로그램을 지원할 수 있도록 스택 버퍼를 이용한 콘트롤러를 내장하고 있어서 객체에 기반한 영상 처리에 효과적이며, 소프트웨어 지향적인 영상 표준에 적용되도록 다양한 포맷의 입력 데이터 처리가 가능하다. 또한 벡터 연산부에서는 MPEG-4의 반화소 단위 처리와 고급 모드 보상(Compensation), 예측(Prediction)이 가능하며, SA(Shape Adaptive)-IDCT 가 가능하다. 또한 벡터 처리기 내에 절대값기, 반감기를 두어 인코더로 확장할 수 있도록 하였다. 설계 및 검증은 $0.6{\mu}{\textrm{m}}$ 5-Volt CMOS TLM(Three Layer Metal) COMPASS 라이브러리를 이용하였다.

• 한국정보통신학회논문지
• /
• 제16권5호
• /
• pp.1095-1101
• /
• 2012

본 논문은 DSP 제어기와 IGBT 구동기를 이용하는 조립과 공급의 자동처리를 위한 BLDC 서보 모터 제어시스템 설계를 제안한다. 조립, 공급 자동처리 시스템은 다양한 동작을 위해 서보모터의 토크, 속도, 위치 제어를 필요로한다. 본 논문은 이러한 서보제어를 벡터제어와 공간벡터 PWM 기법을 이용하여 구현한다. 제어기의 CPU 로서 PWM 파형발생기, A/D 컨버터, SPI 통신 포트 및 많은 입/출력 포트를 갖는 TMS320F240 DSP를 채택하였다. 이 제어시스템은 메인 호스트 PC 가 위로부터의 명령을 전달하고 끝단의 서보제어기의 상태들을 모니터링하는 세 개의 부 DSP시스템을 관리하는 3레벨의 계층적 구조로 이루어져 있다. 각 부 DSP 시스템은 DSP와 IPM을 사용하여 BLDC 서보모터를 제어하는 8개의 BLDC 서보모터제어부를 운영한다. 호스트 시스템과 중간의 DSP는 RS-422을 이용하여 통신하며, 주프로세서와 제어기는 SPI 포트를 이용하여 통신한다.

• Journal of Power Electronics
• /
• 제5권1호
• /
• pp.11-19
• /
• 2005

This paper describes the two control techniques to perform the sensorless vector control of a PMSM by injecting the high frequency voltage to the stator terminal. The first technique is the estimation algorithm of the initial rotor position. A PMSM possesses the saliency which produces the ellipse of the stator current when the high frequency voltage is injected into the motor terminal. The major axis angle of the current ellipse gives the rotor position information at a standstill. The second control technique is a sensorless control algorithm that injects the high frequency voltage to the stator terminal in order to estimate the rotor position and speed. The rotor position and speed for sensorless vector control is calculated by appropriate signal processing to extract the position information from the stator current at low speeds or standstill. The proposed sensorless algorithm using the double-band hysteresis controller exhibits excellent reference tracking and increased robustness. Experimental results are presented to verify the feasibility of the proposed control schemes. Speed, position estimation and vector control were carried out on the floating point processor TMS320VC33.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2004년도 전력전자학술대회 논문집(1)
• /
• pp.11-14
• /
• 2004

This paper presents an implementation of compact vector control system for induction motor using a digital signal processor (DSP) and a smart power module (SPM). The DSP TMS320F2812 has most necessary functions for ac motor control in a single chip and SPM provides a compact power stage. The indirect vector control algorithm is implemented in the drive system using these devices. The developed system is applied by 0.8kW induction servo motor and the all functions are verified through the experiments.

• Journal of Power Electronics
• /
• 제13권5호
• /
• pp.787-797
• /
• 2013

Despite the advantages offered by multilevel inverters, one of the main drawbacks that prevents their widespread use is their circuit complexity as the number of power switches employed is usually high. This paper presents a new multilevel inverter topology with a considerable reduction in the number of power switches used through the switch-sharing approach. The fact that the proposed inverter applies two bidirectional power switches for sharing among the three phases does not prevent it from producing seven levels in the line-to-line output voltage waveforms. A modified scheme of space vector modulation via the application of virtual voltage vectors is developed to generate the PWM signals of the power switches. The performance of the proposed inverter is investigated through MATLAB/SIMULINK simulations and is practically tested using a laboratory prototype with a DSP-based modulator. The results demonstrate the satisfactory performance of the inverter and verify the effectiveness of the modulation method.

• JSTS:Journal of Semiconductor Technology and Science
• /
• 제7권4호
• /
• pp.229-234
• /
• 2007

In this paper, we present an efficient instruction set architecture using vector register file hardware to accelerate operation of general matrix-vector operations in DSP microprocessor. The technique enables in-situ row-access as well as column access to the register files. It can reduce the number of memory access significantly. The technique is especially useful for block-based video signal processing kernels such as FFT/IFFT, DCT/IDCT, and two-dimensional filtering. We have applied the new instruction set architecture to in-loop deblocking filter processing in H.264 decoder. Performance comparisons show that the required load/store operations for the in-loop deblocking filter can be reduced about 42%. The architecture would improve the processing speed, and code density in DSP microprocessor especially for video signal processing substantially.

• 한국전산유체공학회:학술대회논문집
• /
• 한국전산유체공학회 1997년도 추계 학술대회논문집
• /
• pp.17-22
• /
• 1997

The performances of the CRAYT3E and CRAYC90 were compared in the point of aerodynamics. The CRAYC90 with and without the highest vector option was run, respectively. The CRAYT3E was run with various processors (from 1pe to 32pes). The communication utilities of MPI and SHMEM were used to inform the boundary data to the other processors. The DADI Euler solver, which is implicit scheme and use central difference method, was used. The domain decomposition method was also used. As the result, the CRAYC90 with the highest vector option is 5.7 times faster than the CRAYT3E with 1 processor. However, because of the scalability of the CRAYT3E, the CRAYT3E with more than 6 processors is faster than CRAYC90. In case that 32 processors used, the CRAYT3E is 6 times faster than CRAYC90 with the highest vector option.

• Transactions on Electrical and Electronic Materials
• /
• 제13권6호
• /
• pp.278-282
• /
• 2012

Photovoltaic systems have emerged to be one of the cleanest energy systems. Therefore, many large scale solar parks and PV farms have been built to prepare for the post fossil fuel ages. However, due to their large scale, to efficiently manage and operate PV systems, they need to be visually monitored within the range of infrared ray through the Internet. To satisfy this need, the efficient implementation of a high performance video compression standard is required. This paper therefore presents an implementation of H.264 motion estimation, which is one of the most data-intensive and complicated functions in H.264. To achieve this, this work implements vector instructions in hardware and incorporates them in a generic RISC processor architecture, thus increasing the processing speed while minimizing hardware and software design efforts. Extensive simulation results show that this proposed implementation can process motion estimations up to 13 times faster.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2004년도 하계학술대회 논문집 B
• /
• pp.857-859
• /
• 2004

This paper presents design of speed control system for slot less air-cored PM linear synchronous motor using space vector PWM. The vector control requires information about rotor position. And we can need to the Hall sensor for sampling current. In order to agree with this purpose, Digital Signal Processor(TMS320F2406A) developed for implementation of a speed Field Oriented Control.