• Title/Summary/Keyword: Relay Model

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System Identification of the Hammerstein Processes for Automatic Tuning of PID Controller Using Relay Feedback

  • Koo, Doe-Gyoon;Youn, Jung-Hoon;Lee, Jie-Tae;Sung, Su-Whan
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.124.3-124
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    • 2001
  • The nonlinearity of several chemical processes is usually approximated by a series of the nonlinear static element and the linear subsystem. In the case of the model that the nonlinear static element precedes the linear subsystem, it is called a Hammerstein model. It is a Wiener model when the order is reserved. Here we investigate a relay feedback identification method for Hammerstein type nonlinear processes. The proposed method separates the identification of the nonlinear static function from that of the linear subsystem by using a relay feedback method. From two times activation of nonlinear processes, we identify he whole range of the nonlinear static function as well as the ultimate information of the linear subsystem.

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A Study on the Improvement of the Method for Implementing Protection Algorithm by using Component Object Model(COM) (컴포넌트 오브젝트 모델을 응용한 계전 알고리즘 구현방법의 개선에 관한 연구)

  • Park, In-Kwon;Yoon, Nam-Seon;An, Bok-Shin
    • Proceedings of the KIEE Conference
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    • 1998.07c
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    • pp.1210-1212
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    • 1998
  • The complexity of newly developed protection algorithm and higher performance requested by the user makes the software embedded in the protective relay much harder to develop and maintain. The versatility of 32bit microprocessor and the availability of cheaper memory semiconductors introduced the fertile developing background for the protective relay developers. The use of component object model(COM) in the software developing process enables the developer to write much complex code in the easy and safe way and to maintain the code easily, too. And the aid of the COM library, the distributed computing environment will be expected to appear by the use of the COM programming model in the protective relay firmware program.

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Performance Analysis of Amplify-and-Forward Relaying in Cooperative Networks with Partial Relay Selection (부분 중계노드 선택 기반의 협력 네트워크에서 증폭 후 전송 방식에 대한 성능분석)

  • Hwang, Ho-seon;Ahn, Kyung-seung
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.40 no.12
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    • pp.2317-2323
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    • 2015
  • In this paper, we analyze the performance of dual-hop amplify-and-forward (AF) relaying in cooperative networks with partial relay selection. An AF relay gain considered in this paper includes channel-noise-assisted relay gain. Leveraging a received signal-to-noise ratio (SNR) model, we derive exact closed-form expressions for the probability density function (pdf) and cumulative distribution function (cdf) of the end-to-end SNR. Moreover, an exact closed-form expression of the ergodic capacity for dual-hop AF relaying with channel-noise-assisted relay gain and partial relay selection is investigated. The analytical results shown in this paper are confirmed by Monte-Carlo simulations.

Cooperative Nano Communication in the THz Gap Frequency Range using Wireless Power Transfer

  • Samarasekera, A. Chaminda J.;Shin, Hyundong
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.13 no.10
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    • pp.5035-5057
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    • 2019
  • Advancements in nanotechnology and novel nano materials in the past decade have provided a set of tools that can be used to design and manufacture integrated nano devices, which are capable of performing sensing, computing, data storing and actuation. In this paper, we have proposed cooperative nano communication using Power Switching Relay (PSR) Wireless Power Transfer (WPT) protocol and Time Switching Relay (TSR) WPT protocol over independent identically distributed (i.i.d.) Rayleigh fading channels in the Terahertz (THz) Gap frequency band to increase the range of transmission. Outage Probability (OP) performances for the proposed cooperative nano communication networks have been evaluated for the following scenarios: A) A single decode-and-forward (DF) relay for PSR protocol and TSR protocol, B) DF multi-relay network with best relay selection (BRS) for PSR protocol and TSR protocol, and C) DF multi-relay network with multiple DF hops with BRS for PSR protocol and TSR protocol. The results have shown that the transmission distance can be improved significantly by employing DF relays with WPT. They have also shown that by increasing the number of hops in a relay the OP performance is only marginally degraded. The analytical results have been verified by Monte-Carlo simulations.

On the robust adaptive linearizing control for unknown and analytic relay nonlinearity

  • Lee, Jae-Kwan;Abe, Ken-ichi
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10a
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    • pp.177-180
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    • 1996
  • The purpose of this paper is to design a robust adaptive control algorithm for a class of systems having continuous relay nonlinearity. This continuous relay nonlinearity can be defined as an analytic nonlinear function having unknown parameters and bounded unmodeling part. By this mathematical modeling, the whole system can be considered as a nonlinear system having unknown parameters and bounded perturbation. The control algorithm of this paper, RALC, can be constructed by robust adaptive law, feedback linearization, and indirect robust adaptive control. By this RALC, we can obtain that the output of given system can follow that of a stable reference linear model made by designer and the boundedness of all signals in closed-loop system can be maintained. Therefore, we can confirm a robust adaptive control for a class of systems having continuous relay nonlinearity.

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Capacity Analysis of MMR(Mobile Multihop Relay) System (MMR(Mobile Multihop Relay) 시스템의 용량 분석)

  • Lee, Kang-Won;Kook, Kwang-Ho;Choi, Song-In
    • IE interfaces
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    • v.21 no.2
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    • pp.189-197
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    • 2008
  • This study shows achievable capacity gain from the MMR system. Relay stations are placed along the cell boundary in tiers. We can have as many tiers of relays and as many relays in each tier as we want. A model is developed, which can estimate the system capacity varying the number of relays in each tier and the bandwidths allocated to the BS and the RS. It is shown that maximum capacity increases are 21.5% and 18.9% when we have relays in the first tier only and in the first and the second tiers, respectively.

Performance Analysis of Single Hop Cooperative Relay Spectrum Sensing (단일 홉 릴레이 협력 스펙트럼 센싱의 성능 분석)

  • Lee, Mi Sun;Kim, Yoon Hyun;Kim, Jin Young
    • Journal of Satellite, Information and Communications
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    • v.7 no.2
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    • pp.30-35
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    • 2012
  • In this paper, we proposed spectrum sensing using cooperative relay to solve problem of sensing performance degradation due to CPE (Customer-Primise equipments) which causes low SNR (signal-to-noise ratio) problem. This system model is expected that cooperative relay scheme guarantees the high sensing performance by its diversity gain. Based on these backgrounds, in this paper, we apply to cooperative relay scheme to the CR (cognitive radio) system, and simulation results show comparison of the sensing performance combining method EGC and MRC.

Dynamic Performance Test of Power Transformer Protective Relay using 345kV Transformer Modelling of PSCAD/RTDS (PSCAD/RTDS에서 345kV 변압기 모델링을 통한 변압기용 보호계전기의 동특성 시험)

  • Kwon, Gi-Baek;Kim, Cjul-Hwan
    • Proceedings of the KIEE Conference
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    • 2005.07a
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    • pp.120-123
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    • 2005
  • This paper, for the establishment of power system models and test procedures for the dynamic performance test of transformer protective relay, presents power system model, environment establishement between RTDS and protective relay, and the dynamic performance test generated internal fault or external fault.

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Graphical Presentation on Operation Principle of Protective Relay According to Winding Type and Vector Group in Transformer (전력용 변압기에서 권선방식과 벡터그룹에 따른 보호계전기 동작원리의 그래픽 표현)

  • Lee, Jong-Beom
    • Proceedings of the KIEE Conference
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    • 1999.07c
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    • pp.1410-1412
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    • 1999
  • Protective relay for transformer operates in general by comparing with the differential current and the restraint current. These kinds of currents are changed on magnitude and phasor during the fault according to winding type and vector group. This paper presents the differential and restraint currents and operational principle of differential protective relay for two-winding and three-winding transformer with graphical model. It is developed using MATLAB for an educational purpose on engineer related in power system and protection in university and power utility including large factory.

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