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RISS 인기검색어
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- 저자 : Hoai-An Trinh (검색결과 3 건)
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Backstepping Sliding Mode-based Model-free Control of Electro-hydraulic Systems
Hoai Vu Anh Truong,TRINH HOAI AN,안경관 사단법인 유공압건설기계학회 2022 드라이브·컨트롤 Vol.19 No.1
This paper presents a model-free system based on a framework of a backstepping sliding mode control (BSMC) with a radial basis function neural network (RBFNN) and adaptive mechanism for electro-hydraulic systems (EHSs). First, an EHS mathematical model was dedicatedly derived to understand the system behavior. Based on the system structure, BSMC was employed to satisfy the output performance. Due to the highly nonlinear characteristics and the presence of parametric uncertainties, a model-free approximator based on an RBFNN was developed to compensate for the EHS dynamics, thus addressing the difficulty in the requirement of system information. Adaptive laws based on the actor-critic neural network (ACNN) were implemented to suppress the existing error in the approximation and satisfy system qualification. The stability of the closed-loop system was theoretically proven by the Lyapunov function. To evaluate the effectiveness of the proposed algorithm, proportional-integrated-derivative (PID) and improved PID with ACNN (ACPID), which are considered two complete model-free methods, and adaptive backstepping sliding mode control, considered an ideal model-based method with the same adaptive laws, were used as two benchmark control strategies in a comparative simulation. The simulated results validated the superiority of the proposed algorithm in achieving nearly the same performance as the ideal adaptive BSMC.
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Hoai-An Trinh,Hoai Vu Anh Truong,Minh-Duc Pham,Tri Cuong Do,Hong-Hee Lee,Kyoung Kwan Ahn 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.2
Using renewable energy is becoming a new tendency for vehicular applications to reduce fossil fuel consumption and minimize greenhouse gas emissions. Well-known as an eco-friendly energy source, the proton exchange membrane fuel cell (PEMFC) is extensively used in hybrid power systems to achieve the objective of zero-emission and air protection. However, this type of fuel cell offers slow dynamics and cannot adapt to abrupt load variations when used as a primary energy source. To overcome this shortcoming, battery (BAT) and/or supercapacitor (SC) are supplemented as auxiliary sources. In this paper, an innovative energy management strategy (EMS) for a PEMFC/BAT/SC hybrid power source (HPS) is proposed to improve the accuracy of power distribution from energy sources to the load. In detail, according to different characteristics of energy sources, a frequency decoupling (FD) method is designed to determine the required currents for PEMFC, BAT, and SC based on the load power demand. Besides, an adaptive DC bus control loop is utilized to guarantee a stable DC output voltage by using the BAT. The proposed EMS is simulated in a MATLAB/Simulink environment and experimentally implemented with a real-time DSP TMS320F28379D controller board. Subsequently, a test bench of a 200 W PEMFC, 24 V–12 Ah battery, and 25 V–60 F supercapacitor is conducted for experimental validation. The obtained results show that the proposed EMS is effective to coordinate energy flows between the three used sources and enhance the fuel cell performance in a hybrid power system.
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찐호이안 ( Hoai-an Trinh ),유재웅 ( Jae Ung Yu ),안지환 ( Jee Hwan Ahn ),권태민 ( Tae Min Kwon ),안경관 ( Kyoung Kwan Ahn ) 한국농업기계학회 2023 한국농업기계학회 학술발표논문집 Vol.28 No.2
오늘날 전기자동차, 건설기계 또는 농기계와 같은 종류의 기계에 대한 재생 동력원의 구현은 기존의 내연기관을 대체하고 온실가스 배출을 줄이기 위해 점점 더 많이 사용되고 있다. 최근, 양성자 교환막 연료전지(PEMFC)는 전통적인 에너지원을 대체하여 수소 트랙터를 개발하는데 사용될 수 있는 주요하고 실행 가능한 녹색 에너지원으로 주목받고 있다. 또한, 에너지 관리 전략(EMS) 개발은 다른 작업 조건에서 부하 전력 수요를 만족시키고 수소 트랙터 내부의 동력원 간의 적합한 전력 분배를 보장하기 위한 중요한 요건이다. 이러한 목적을 위해, 본 논문에서는 PEMFC 시스템으로 구동되는 수소 트랙터와 Li-ion 배터리 팩과 슈퍼커패시터 뱅크로 구성된 에너지 저장 장치에 대한 최적의 EMS를 제안한다. 본 시스템에서는 부하 전력 적응을 보장할 뿐만 아니라 수소 소모를 최소화하고 연료전지 스택의 작동 효율을 향상시키기 위해 등가 소비 최소화 전략을 제안한다. 마지막으로, 제안된 전략과 이전 전략의 효과를 다른 시나리오에서 검증하고 비교하기 위해 비교 시뮬레이션을 수행한다.
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