• Proceedings of the KIPE Conference
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• 2012.11a
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• pp.231-232
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• 2012

본 논문에서는 회전자 인버터 내장형 동기 전동기에 고주파 신호 주입 센서리스 알고리즘을 적용하는 방법을 제안한다. 고주파 신호주입 센서리스는 자기적인 돌극성을 활용하여 자속축을 찾기 때문에, 자기적인 돌극성이 뚜렷하지 않은 회전자 인버터 내장형 동기 전동기에서는 이를 적용할 수 없는 문제가 존재 한다. 이를 해결하기 위해 회전자 인버터를 이용하여 가상의 돌극성을 생성하고, 이 가상의 돌극성을 이용한 고주파 신호주입 센서리스 알고리즘을 제안한다. 제안된 방법은 실험을 통하여 검증되었으며, 추가적인 손실이나 하드웨어 없이 센서리스 운전이 가능함을 확인하였다.

• Proceedings of the KIPE Conference
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• 2012.11a
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• pp.175-176
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• 2012

본 논문에서는 동기정류 및 부트스트랩 회로를 이용한 Cascade Buck-Boost 컨버터의 전압 제어 및 동작 모드 변경 기법을 제안한다. 제안한 방법은 기존의 제어 방법에 비해 모든 전압 영역에서 안정적으로 승 강압 모드 변경이 가능하며 높은 효율을 갖는다. 이의 검증을 위해 우선 다양한 제어 기법을 소개하고, 각각을 전압 제어 특성 및 효율 측면에서 실험적으로 비교한다.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2004.10a
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• pp.447-452
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• 2004

동기전동기를 처음 기동시킬 때는 유도전동기와 같이 동작하게 된다. 회전자가 고정자 자계에 거의 도달하였을 때 M 전류를 투입하게 되면, 회전자의 여자코일에 동기화 토크가 발생하게 된다. 그러나 동기화 토크의 부족은 회전자의 첫 동요 시, 회전자 각의 불안정을 야기하게 된다. 동기화 토크는 신속 정확한 동작 제어에 의해 회복될 수 있다. 더욱이 역률 100%의 안정도로 동작하기에는 어려운 부분이 있다. 그러므로 본 논문에서는 이러한 문제를 해결하기 위해 퍼지 추론 기법을 이용한 여자 전류 제어 시스템을 제안하였다. 그 주된 원리는 다양한 부하 조건하에서 부하각과 역률 100%의 동작점을 추정하고, 퍼지 추론 기법에 의해 여자 전류를 제어하는 것이다. 제안된 퍼지 제어기는 각종 특수 동작 명령어로 사용되는 마이크로프로세서형 PLC(Programmable Logic Controller)를 사용하여 구현되었으며, 전기자 전류를 감지하는 제어전압 보상기, 비교기, 그리고 쵸퍼회로로 구성된 기존의 제어기에 비해 성능이 우수하다. 이는 일련의 실험을 통해 역률 100%에서의 개선된 안정적인 동작이 가능함을 보여주었다.

• Proceedings of the KIEE Conference
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• 1989.11a
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• pp.258-263
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• 1989

The configuration of Brushless DC moter is similar to the permanent magnet Synchronous moter. Power transistors are oftenly used to supply the switching by feedback signals of rotor positioning sensors. Brushless DC moter have been used in Aerospace and Robotics where the electromagnetic noise or the sparking of the commutator contact can not be tolerated and long - lived maintenance - free operation is required. This paper describes the design of the microprocessor - based controller for the Brushless DC moter. The controller is designed to operate for the constant torque generation and variable speed control using sinusoidal PWM inverters and resolvers as rotor positioning sensors.

• Proceedings of the KIEE Conference
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• 1999.07c
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• pp.1039-1041
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• 1999

Recently Advanced Static Var Compensators(ASVC) or STATic Synchronous COMpesator(STATCOM) has been considered as a next generation reactive power controller. [2] STATCOM is a voltage source inverter(VSI) based static VAr compensator with only small capacitors on the do side. The main function of the STATCOM is to keep the bus voltage magnitude at the desired value. [1] This paper compares the PAM STATCOM with PWM STATCOM. The characteristics and the control method of each model is analyzed. And the simulation of STATCOMs based on the above two methods was presented.

• Proceedings of the KIEE Conference
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• 1999.07c
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• pp.1242-1244
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• 1999

AVR parameter tuning for voltage control of power system generators has generally been done with the open-circuit model of the synchronous generator. When the generator is connected on-line and operating at rated load conditions, the AVR operates in an entirely different environment from the open-circuit conditions. This paper describes a new method for AVR parameter tuning using optimization technique with on-line linearized system model. As this method considers not only the on-line models but also the off-line open-circuit models, AVR parameters tuned by this method can give the sufficiently stable performance at the open-circuit commissioning phase and give the desired performance at the operating conditions. Also this method estimates the optimum parameters for desired performance indices that are chosen for satisfying requirements in some practical applications, the performance of the AVR can satisfy the various requirements.

• Proceedings of the KIEE Conference
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• 1999.07f
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• pp.2526-2528
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• 1999

Parameters of equivalent circuit of IPMSM are varied according to current magnitude and current phase angle. Especially, Parameter variation of IPMSM for an electric vehicle(EV) is critical. Because current magnitude is very large. and current phase angle range also is wide. So, variation characteristics of $L_d$ and $L_q$ of the IPMSM are analyzed and verified through experiments. And then new parameter estimator of $L_d$ and $L_q$ that is constructed by neural network technique is suggested Using numerical method, the advanced characteristics of current controller of vector control algorithm is verified.

• Proceedings of the KIEE Conference
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• 2004.07d
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• pp.2288-2291
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• 2004

In this paper, UPS, which is embedded in computer, is developed against the poor utility power system. In the developed system, PIC16C74A is used as the main controller, and UPS system consists of micom control module, power failure detecting module, charging module, power module, synchronous transfer module, and GUI module. Additionally, GUI module consists of battery charging state unit, power operating unit and operating state unit.

• 제어로봇시스템학회:학술대회논문집
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• 2001.10a
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• pp.152.4-152
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• 2001

We investigate, in this paper, the use of FPGA(Field Programmable Gate Array) architectures for real-time processing of digital linescan camera. The use of FPGAS for low-level processing represents an excellent tradeoff between software and special purpose hardware implementations. A library of modules that implement common low-level machine vision operations is presented. These modules are designed with gate-level hardware components that are compiled into the functionality of the FPGA chips. This new synchronous unidirectional interface establishes a protocol for the transfer of image and result data between modules. This reduces the design complexity and allows several different low-level operations to be applied to the same input image ...

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.40 no.1
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• pp.45-54
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• 2003

Turbo compressor needs high speed rotation of impeller in structure, high rated gearbox and conventional induction motor. This mechanical system increased the moment of inertia and mechanical friction loss. Resently, the study of turbo compressor applied super high speed motor and drive, removing gearbox made its sire small and mechanical friction loss minimum. This paper describes the implementation of the vector control schemes for a variable-speed 131㎾ PMSM(Permanent Magnet Synchronous Motor) drive in super-high speed application.