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박성우(Sung-Woo Park),박희성(Hee-Sung Park),양정환(Jeong-Hwan Yang),장진백(Jin-Beak Jang) 한국조명·전기설비학회 2021 한국조명·전기설비학회 학술대회논문집 Vol.2021 No.11
This paper gives a summary on electrical power subsystem design results for LEO(Low Earth Orbit) application with SAR(Synthetic Aperture Radar) payload system Unlikely optical payloads, SAR payload system requires very large instantaneous power during its operation. This means that SAR payload satellite needs a higher power bus voltage than that of general optical satellites to reduce power loss. In order to utilize the existing design heritage, was implemented as a series connection of two 2P(Parallel)12S(Serial) structured battery packages. Finally, it is verified that each designed component satisfies the assigned requirements through the power performance analysis.
박성우(Sung-Woo Park),윤희광(Hee-Kwang Yoon),박희성(Hee-Sung Park),장진백(Jin-Beak Jang),이상곤(Sang-Kon Lee) 한국조명·전기설비학회 2009 한국조명·전기설비학회 학술대회논문집 Vol.2009 No.5월
Optimized controller design for converters are very important because control-loop characteristics of converters determine the dynamic performances of converters. In addition, verification process of the control-loop characteristics by simulation and measurement with real hardware is sure to be performed after all parameters for controller and main power-stage are fixed. In this paw, general process for designing outer-loop controller of paralleling step-down converter is described. Simulation results are also contained for verifying validity of controller design results. Finally, voltage control-loop measurement method is explained and results are compared with simulation outputs.
박성우(Sung-Woo Park),박희성(Hee-Sung Park),장진백(Jin-Beak Jang),장성수(Sung-Soo Jan) 한국조명·전기설비학회 2005 한국조명·전기설비학회 학술대회논문집 Vol.2005 No.5월
In this paper, one general approach is proposed for the design of power system that can be applicable for next generation LEO satellite application. The power system consists of panels, battery, and power control and distribution unit(PCDU). The PCDU contains solar array modules, battery interface modules, low-voltage power distribution modules, high-voltage distribution modules, heater power distribution modules, on-board computer interface modules, and internal DC/DC converter modules. The PCDU plays roles of protection of battery against overcharge by active control of solar array generated power, distribution of unregulated electrical power via controlled outlets to bus and instrument units, distribution of regulated electrical power to selected bus and instrument units, and provision of status monitoring and telecommand interface allowing the system and ground operate the power system, evaluate its performance and initiate appropriate countermeasures in case of abnormal conditions. We review the functional schemes of the main constitutes of the PCDU such as the battery interface module, the auxiliary supply module, solar array regulators with maximum power point tracking(MPPT) technology, heater power distribution modules, spacecraft unit power distribution modules, and instrument power distribution module.
평균전류모드 제어방법을 적용한 병렬형 태양전력조절기 설계 및 제작
박성우(Sung-Woo Park),박희성(Hee-Sung Park),장진백(Jin-Beak Jang),장성수(Sung-Soo Jang),이종인(Jong-In Lee) 한국조명·전기설비학회 2004 한국조명·전기설비학회 학술대회논문집 Vol.2004 No.5월
Recently, as the power capability of satellites increase, we need to develop a new SAR(Solar Array Regulator) with much higher power capacity whenever we design a power system of a new satellite. In this case, modular design method could be a good solution for this kind of problem. But when we use a modular method in the design of the parallelled converter, it is very important to share current equally between each module connected in parallel. In this paper, we study how to design the optimum current control-loop and voltage control-loop whorl we apply average current-mode control method to the parallel module SAR. With the design results, we make a prototype of the 3-module paralleling SAR and verify its performances.
병렬운전 컨버터의 리플 저감을 위한 제어방법에 대한 연구
박성우(Sung-Woo Park),박희성(Hee-Sung Park),장진백(Jin-Beak Jang),장성수(Sung-Soo Jang),이종인(Jong-In Lee) 한국조명·전기설비학회 2006 한국조명·전기설비학회 학술대회논문집 Vol.2006 No.11월
In this paper, the control strategy for paralleling operation of multiple converter is investigated. The number of modules in active are detected and the phases of PWM signals applied to each modules are set autonomously by the controller. Even when there is a failure on parallelled-converters, self-detection operations of the number of converters in active also shall be done. And the expandibility of converter modular in parallel can be accomplished easily by adding several parts in the converter power-stage and controller circuitry.
태양 전지의 전압, 전류 동작점 제어를 이용한 아날로그 MPPT 설계
박희성(Hee-Sung Park),박성우(Sung-Woo Park),장진백(Jin-Beak Jang),장성수(Sung-Soo Jang) 한국조명·전기설비학회 2004 한국조명·전기설비학회 학술대회논문집 Vol.2004 No.11월
The SAR(Solar Array Regulator) of KOMPSAT(Korea Multi Purpose SATellite)-1, 2 regulates a photovoltaic power according to the duty ratio commands of the ECU. But the ECU has so many other jobs that it can not calculate the solar array condition immediately. It means the SAR cannot always generate the maximum power of a photovoltaic. Nowadays, the commercial photovoltaic systems are using a controller operated by digital processing. But the usage for satellite is not adaptable. It is not easy to find the processor of the space grade and the price is expensive. So in this paper, the simple analog MPPT(Maximum Power Point Tracking) algorithm is proposed for the small satellite in LEO. This algorithm does not need any calculation of power by multiplication of voltage and current and a measurement of the solar array temperature. It is consist of only two sample and hold circuits, two comparators, a flip-flop, and an integrator. The proposed MPPT algorithm is verified by the simulation and experimental.
다목적 실용위성의 태양전력조절기 모듈화를 위한 새로운 전원단 설계 및 해석
박희성(Hee-Sung Park),박성우(Sung-Woo Park),장진백(Jin-Beak Jang),장성수(Sung-Soo Jang) 한국조명·전기설비학회 2004 한국조명·전기설비학회 학술대회논문집 Vol.2004 No.5월
KOMPSAT series use software-controlled unregulated bus system in which the main bus is directly connected to a battery and the duty-ratio for PWM switch is controlled by the on-board satellite software. This paper proposes a new power-stage circuit that can be available for modularization of the power regulator which is used at the software-controlled unregulated bus system satellite. And we analyze the proposed power-stage operation according to its operating modes and verify it by performing software simulation and hardware experiment using prototype. We construct a parallel-module converter which is composed of proposed power-stage and perform experiment to verify modular characteristics of the proposed power-stage. Finally, we verify the usefulness of the proposed power-stage by comparing above results with those of a parallel-module converter made of conventional power-stages.
전력조절분배기 저전압 컨버터 모듈의 고장 방지에 대한 연구
박성우(Sung-Woo Park),박희성(Hee-Sung Park),장진백(Jin-Beak Jang),장성수(Sung-Soo Jang),이상곤(Sang-Kon Lee) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.5월
Even though many modular converters have several internal protection circuit blocks for various abnormal operation conditions, there are many failure cases on modular converters at real applications. In this paper, the control strategy for failure protection of converters with internal 'In-Hibit' function is investigated. As an example, for the MDI modular converters the in-hibit function application is realized and the test results shows that adopting in-hibit function while converter switching reduces the voltage and current stress. And the reduction of switching stress on converter will decrease failure rate on converters.