• 제목/요약/키워드: Reset control

검색결과 128건 처리시간 0.031초

포화입력을 가진 비선형 시스템에 대한 슈퍼바이저 제어의 안정성 연구 (A Study on the Stability of Supervisory Control for Nonlinear System with Saturating Input)

  • 차경래
    • 한국생산제조학회지
    • /
    • 제8권4호
    • /
    • pp.112-122
    • /
    • 1999
  • In realistic control systems the nonlinear saturation attributes of the control actuator due to physical limitations should be taken into account This nonlinear saturation of actuators may cause not only deterioration of the control performance but also a large overshoot during start-up and shut-down. As the overshoot increases the system may become oscillatory unstable. in this paper the supervisor implementation which guarantees good performance for saturation operation and prevents reset wind up is presented, Moreover the sufficient conditions of the stability for saturated system using supervisory control with a dynamic controller are provided in the continuous-time and in the discrete-time domain Numerical example is illustrated to depict the efficiency of supervisory control for a typical satuaurated production-distribution system controlled by a discrete-time dynamic controller and to validate basic results by simulation.

  • PDF

중앙 냉방시스템의 전력량 요금절감을 위한 디맨드제어 적용방안 연구 (Demand Control Application Strategies for Saving Electric Power Price of Central Cooling System)

  • 황진원;송재엽;안병천
    • 한국지열·수열에너지학회논문집
    • /
    • 제8권4호
    • /
    • pp.1-7
    • /
    • 2012
  • In this study, computer simulation for demand control strategies to save the electric energy and power price in the building central cooling system is done. The demand control and outdoor reset control algorithms are applied by consideration the electric energy and power price according to the energy consumption characteristics. The suggested control methods show better responses in the power price and energy consumption in comparison with the conventional one.

A Reset-Free Anti-Harmonic Programmable MDLL-Based Frequency Multiplier

  • Park, Geontae;Kim, Hyungtak;Kim, Jongsun
    • JSTS:Journal of Semiconductor Technology and Science
    • /
    • 제13권5호
    • /
    • pp.459-464
    • /
    • 2013
  • A reset-free anti-harmonic programmable multiplying delay-locked loop (MDLL) that provides flexible integer clock multiplication for high performance clocking applications is presented. The proposed MDLL removes harmonic locking problems by utilizing a simple harmonic lock detector and control logic, which allows this MDLL to change the input clock frequency and multiplication factor during operation without the use of start-up circuitry and external reset. A programmable voltage controlled delay line (VCDL) is utilized to achieve a wide operating frequency range from 80 MHz to 1.2 GHz with a multiplication factor of 4, 5, 8, 10, 16 and 20. This MDLL achieves a measured peak-to-peak jitter of 20 ps at 1.2 GHz.

Effect of Scan-bias during Reset Period in a Negative Waveform

  • Park, W.H.;Lee, S.J.;Lee, J.Y.;Kang, J.
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
    • /
    • pp.728-731
    • /
    • 2009
  • A negative waveform having inverted polarity of conventional waveform during reset and sustain periods was proposed to improve the driving characteristics. In order to control the negative wall-charge distribution, a positive bias on the scan electrode was applied during reset period. Compared to 0 V scan-bias condition, at 8 V scan-bias the formative time lag was improved about 23.95 % and the average time lag was improved about 14.91 %. All experiments were performed with the 42-inch PDP module in XGA resolution.

  • PDF

최소제곱법과 비례로직을 이용한 시스템고압 알고리즘 (The High-side Pressure Algorithm by using a Least Square Method and a Proportional Logic)

  • 한도영;노희전
    • 대한설비공학회:학술대회논문집
    • /
    • 대한설비공학회 2008년도 하계학술발표대회 논문집
    • /
    • pp.16-21
    • /
    • 2008
  • In order to protect the environment from the refrigerant pollution, the $CO_2$ may be regarded as one of the most attractive alternative refrigerants for an automotive air-conditioning system. Control methods for a $CO_2$ system should be different because of $CO_2$'s unique properties as a refrigerant. Especially, the high-side pressure of a $CO_2$ system should be controlled for the effective operation of the system. High-side pressure algorithms, which were composed of the pressure setpoint algorithm and the pressure setpoint reset algorithm, were developed. Pressure setpoint algorithms, by using a neural network and by using a least square method, were developed and compared. Pressure setpoint reset algorithms, by using a fuzzy logic and by using a proportional logic, were also developed and compared. Simulation results showed that a least square method was more useful than a neural network for the pressure setpoint algorithm. And a proportional logic was more practical than a fuzzy logic for the pressure setpoint reset algorithm.

  • PDF

지역난방의 일반제어 및 열량제어 에너지 시뮬레이션 (Energy Simulation for Conventional and Thermal-Load Controls in District Heating)

  • 이성욱;홍희기;조성환
    • 설비공학논문집
    • /
    • 제27권1호
    • /
    • pp.50-56
    • /
    • 2015
  • Korea district heating systems have mainly used setting temperature control and outdoor reset control. Different from such conventional normal methods, a thermal-load control proposed in Sweden can decrease the return temperature and reduce pump power consumptions because the control is able to provide the appropriate amount of required heat. In this study, further improved predictive optimal control in addition to the conventional controls were simulated in order to verify its effect in district heating system using TRNSYS 17. $200m^2$ apartment housing which accounts for 25% in Korea and is used as a calculation model;. the number of households in the simulation was 9. As a result, a higher temperature difference and decreasing flow rate at primary loop were shown when using thermal-load control.

퍼지 알고리즘을 기반으로한 바닥복사 난방시스템의 외기보상제어 (Outdoor Reset Control based on Fuzzy Algorithm for Radiant Floor Heating System)

  • 최종요;백재호;김은태;이희진;박민용
    • 대한전자공학회:학술대회논문집
    • /
    • 대한전자공학회 2008년도 하계종합학술대회
    • /
    • pp.1073-1074
    • /
    • 2008
  • This paper presents outdoor reset control based on fuzzy algorithm for radiant floor heating system. We construct fuzzy system under indoor temperature and outdoor temperature. Simulation is based on TRNSYS with MATLAB. MATLAB is calculating and decide heat source using fuzzy system. Energy efficiency of Fuzzy algorithm is analyzed in term of indoor by TRNSYS System.

  • PDF

상태궤환 기법을 적용한 회전식 역진자 시스템의 리세트 제어에 관한 연구 (A Study on Control of Rotary Inverted Pendulum systems using State Feedback and Reset Control Approaches)

  • 한현태;조현철;신동기;이영진;이권순
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2009년도 제40회 하계학술대회
    • /
    • pp.2039_2040
    • /
    • 2009
  • 본 논문은 리세트(reset) 제어이론과 상태궤환 안정성 기법을 이용하여 회전식 역진자 시스템의 강인제어시스템을 제안한다. 우선 복잡한 비선형 역진자 시스템을 평형점에서 선형화한 후 상태궤환기법을 이용하여 안정한 모델을 구성한다. 이 선형시스템 모델에서 발생할 수 있는 시스템 섭동으로 인한 실시간 제어오차를 보상하기 위한 리세트 제어알고리즘을 보조제어시스템으로 추가한다. 컴퓨터 시뮬레이션을 통해 제안한 제어 알고리즘의 타당성 및 성능의 개선정도를 분석한다.

  • PDF

X-선 미소열량계 신호 검출을 위한 광대역 SQUID 전류증폭기와 조절 회로 (Wide-bandwidth SQUID Current Amplifier and Control Electronics for X-ray Microcalorimeter)

  • 김진목;이용호;권혁찬;김기웅;박용기
    • Progress in Superconductivity
    • /
    • 제5권1호
    • /
    • pp.31-37
    • /
    • 2003
  • Wide-bandwidth SQUID current amplifier and its control electronics have been constructed for detecting pulse outputs of a superconducting microcalorimeter. The current amplifier made of a double relaxation oscillation SQUID (DROS) has a bandwidth of 1.2 MHz and typical white noise level of about 6 pA/(equation omitted) Hz. To increase the dynamic range of the current amplifier, the flux-locked loop (FLL) has additional circuits to reset the integrator and to count reset numbers which present the number of passed flux quanta. In this system, dynamic range covers from -65 mA to +65 mA. SQUID electronics are controlled by software to get the optimum FLL condition, and to control the current to bias the transition edge sensor (TES). The electronics are shielded from the outside electromagnetic noises by using an aluminum case of 66 mm ${\times}$ 25 mm ${\times}$ 100 mm, and consist of 2 separate printed-circuit-boards for the current amplifier and the control electronics, respectively. The SQUID current amplifier and its control electronics will be used in TESs for detecting photons such as UV and X-ray with high energy resolution.

  • PDF

건물 중앙냉방시스템의 에너지절감을 위한 최적운전 방안에 관한 실험적 연구 (Experimental Study on Optimal Operation Strategies for Energy Saving in Building Central Cooling System)

  • 황진원;안병천
    • 한국산학기술학회논문지
    • /
    • 제14권9호
    • /
    • pp.4610-4615
    • /
    • 2013
  • 본 연구에서는 중앙냉방시스템용 모형실험장치를 구성하여 에너지 소비량 및 전력사용요금의 절감을 위한 최적제어방법을 구현하여 실험적 연구를 수행하였다. 최적제어방법으로는 새벽시간의 예냉을 이용한 전력디맨드 응답제어와 외기온도변화를 고려한 외기보상제어방법 등을 고려하였으며, 제어알고리즘은 LabVIEW 프로그램을 이용하여 작성하였으며, 제어 및 모니터링을 통해 최적제어방법과 기존제어방법과의 제어성능을 비교 고찰하였다. 연구결과로서 본 연구에서 제시한 최적제어방법이 기존제어방법에 비해 양호한 응답특성을 나타냈으며, 에너지소비량은 약 9.5%, 전력요금은 약 15.7%를 각각 절감한 것으로 나타났다.