• Title/Summary/Keyword: Minimum energy loss

Search Result 112, Processing Time 0.026 seconds

Interturn Fault Tolerant Driving Algorithm of IPMSMs : Maximum Torque Control within Power Loss Limit (IPM모터의 턴쇼트 고장 대응운전 알고리즘 : 전력 손실 한계 내에서 최대토크 제어)

  • Lim, Sung-Hwan;Gu, Bon-Gwan
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.67 no.1
    • /
    • pp.52-60
    • /
    • 2018
  • The winding of the motor stator coil is broken due to external stress and various factors. If the proper current is not injected when interturn fault(ITF) occurs, the fault can easily be expanded and the motor can be finally destroyed, resulting in many problems with time costs and safety. In this paper, the power loss limit concept, which is the inherent durability of each motor, is applied to secure safety by controlling the total power loss of the motor within the limits. So, we propose an algorithm that can control maximum torque per minimum power loss based on constant torque curve and power loss limit. To verify the proposed method, the simulation and experimental results with an Interior permanent magnet synchronous motor(IPMSM) having an ITF are shown.

Energy Efficient Data-centric based Sensor Network Routing Protocol (에너지 효율적인 데이타 기반 센서 네트워크 라우팅 프로토콜)

  • Park Noseong;Kim Daeyoung
    • Journal of KIISE:Information Networking
    • /
    • v.32 no.2
    • /
    • pp.261-277
    • /
    • 2005
  • We propose the PAD (Power Aware Data-centric Routing Protocol), which finds minimum energy routes and prolongs network life-time, for the data-centric sensor networks. Firstly, the PAD discovers the minimum energy Property graph by removing redundant communication links. The proposed a1gorithm to find the minimum energy property graph is faster, simpler and easier to implement than existing aIgorithms. Secondly, the PAD runs the DDBF (Distributed Data-centric Bellman-Ford Algorithm) to determine routing paths between a base node and all sensor nodes. The DDBF selves the drawbacks of the distributed bellman-ford algorithm, i.e. slow convergence and a possible cyclic routing path. Since the PAD is a fully distributed algorithm with low overhead, it can be used in various kinds of resource limited sensor network applications.

An optimal design of the Kopp Ball Variator continuously variable transmission (Kopp Ball Variator 무단변속기의 최적설계)

  • 임경호;김두만
    • Journal of the korean Society of Automotive Engineers
    • /
    • v.14 no.1
    • /
    • pp.38-46
    • /
    • 1992
  • An optimal design technique for minimum power loss in Kopp Ball Variator Continuously Variable Transmission is developed. Kinematic analysis of traction drive contact is performed to find spin for Kopp Ball Variator, and traction force and torque are calculated from mathem atical model of traction drive contact. The objective function for optimal design is total power loss including contact loss and bearing losses. The design contraints are derived from energy balance for input and output power. The formulated optimal design problem is implemented to a non-linear programming algorithm to find minimum power loss. The performance of optimal ly designed Kopp Ball Variator shows that efficiency is increased about 5-10% compare to a commercial unit.

  • PDF

Optimal Relocating of Compensators for Real-Reactive Power Management in Distributed Systems

  • Chintam, Jagadeeswar Reddy;Geetha, V.;Mary, D.
    • Journal of Electrical Engineering and Technology
    • /
    • v.13 no.6
    • /
    • pp.2145-2157
    • /
    • 2018
  • Congestion Management (CM) is an attractive research area in the electrical power transmission with the power compensation abilities. Reconfiguration and the Flexible Alternating Current Transmission Systems (FACTS) devices utilization relieve the congestion in transmission lines. The lack of optimal power (real and reactive) usage with the better transfer capability and minimum cost is still challenging issue in the CM. The prediction of suitable place for the energy resources to control the power flow is the major requirement for power handling scenario. This paper proposes the novel optimization principle to select the best location for the energy resources to achieve the real-reactive power compensation. The parameters estimation and the selection of values with the best fitness through the Symmetrical Distance Travelling Optimization (SDTO) algorithm establishes the proper controlling of optimal power flow in the transmission lines. The modified fitness function formulation based on the bus parameters, index estimation correspond to the optimal reactive power usage enhances the power transfer capability with the minimum cost. The comparative analysis between the proposed method with the existing power management techniques regarding the parameters of power loss, cost value, load power and energy loss confirms the effectiveness of proposed work in the distributed renewable energy systems.

An Evaluation of Airtightness Performance and Analysis of Energy Savings Potential in Apartment Housing (공동주택의 기밀성능 평가 및 에너지 절감효과 분석)

  • Leigh, Seung-Bok
    • Solar Energy
    • /
    • v.15 no.3
    • /
    • pp.119-125
    • /
    • 1995
  • Since the using of heating energy associated with infiltration is significant in a building, the efforts to minimize the infiltration while ensuring minimum ventilation rates for various types of occupancy will be beneficial. In constrast to that many efforts have been made to reduce heat loss by improving thermal resistance of building envelope, little has been tried to reduce heat loss from infiltration. For achieving such an objective, measurement of air leakage rate will be pre-requisite as a diagnostic tool. A blower door system, a depressurization/pressurization method, was employed and it demonstrated a good potential for measuring airtightness performance of residential buildings. Based on the test results, annual energy savings for residential heating was estimated by reducing infiltration to a level of reasonably airtight or to a level of ASHRAE Standard 62-1989 for minimum ventilation.

  • PDF

A High Speed Address Recovery Technique for Single-Scan Plasma Display Panel(PDP) (Single-Scan Plasma Display Panel(PDP)를 위한 고속 어드레스 에너지 회수 기법)

  • Lee, Jun-Young
    • Proceedings of the KIEE Conference
    • /
    • 2005.05a
    • /
    • pp.239-242
    • /
    • 2005
  • A high speed address recovery technique for AC plasma display Panel(PDP) is proposed. By removing the GND switching operation, the recovery speed can be increased and switching loss due to GND switch also becomes to be reduced. The proposed method is able to perform load-adaptive operation by controlling the voltage level of energy recovery capacitor, which prevents increasing inefficient power consumption caused by circuit loss during recovery operation. Thus, the technique shows the minimum address power consumption according to various displayed images, different from Prior methods operating in fixed mode regardless of images. Test results with 50" HD single-scan PDP(resolution = 1366$\times$768) show that less than 350ns of recovery time is successfully accomplished and about 54% of the maximum power consumption can be reduced, tracing minimum power consumption curves.

  • PDF

Load-Adaptive Address Energy Recovery Technique for Plasma Display Panel

  • Lee Jun-Yeong
    • Proceedings of the Korean Society Of Semiconductor Equipment Technology
    • /
    • 2005.05a
    • /
    • pp.192-200
    • /
    • 2005
  • A high speed address recovery technique for AC plasma display panel(PDP) is proposed. By removing the GND switching operation, the recovery speed can be increased and switching loss due to GND switch also becomes to be reduced. The proposed method is able to perform load-adaptive operation by controlling the voltage level of energy recovery capacitor, which prevents increasing inefficient power consumption caused by circuit loss during recovery operation. Thus, th e technique shows the minimum address power consumption according to various displayed images, different from prior methods operating in fixed mode regardless of images. Test results with 50' HD single- scan PDP(resolution : $1366{\times}768$) show that less than 350ns of recovery time is successfully accomplished and about $54\%$ of the maximum power consumption can be reduced, tracing minimum power consumption curves.

  • PDF

Exergy Analysis of Refrigeration Cycle With Mixed Refrigerants Considering The Heat Exchange Process (열교환 과정을 고려한 혼합매체 냉동사이클의 엑서지 해석)

  • Jeong Sang Kwon;Ro Sung Tack
    • The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
    • /
    • v.16 no.3
    • /
    • pp.305-314
    • /
    • 1987
  • Thermodynamic analysis of a mixed refrigerant refrigeration cycle has been performed by computing thermodynamic properties of various refrigerants. The analyses are carried cut to identify the sources and distribution of the energy degradation by irreversible processes. Heat exchange process with the surroundings produces the entropy and the irreversible loss can be reduced by the mixed refrigerant whose phase change temperature varies during the phase change processes in the evaporator and the condenser. The concept has been applied to find the minimum compression work and thus the minimum energy loss in the overall system, specifically in the case of the mixed refrigerant of R12 and R114. Parametric studies have been added to recognize the various factors affecting the system performance.

  • PDF

The Energy Saving for Separately Excited DC Motor Drive via Model Based Method

  • Udomsuk, Sasiya;Areerak, Kongpol;Areerak, Kongpan
    • Journal of Electrical Engineering and Technology
    • /
    • v.11 no.2
    • /
    • pp.470-479
    • /
    • 2016
  • The model based method for energy saving of the separately excited DC motor drive system is proposed in the paper. The accurate power loss model is necessary for this method. Therefore, the adaptive tabu search algorithm is applied to identify the parameters in the power loss model. The field current values for minimum power losses at any load torques and speeds are calculated by the proposed method. The rule based controller is used to control the field current and speed of the motor. The experimental results confirm that the model based method can successfully provide the energy saving for separately excited DC motor drive. The maximum value of the energy saving is 48.61% compared with the conventional drive method.

A Study on Power Flow and Marginal Factor based on Optimal Power Flow using Nonlinear Interior Point Method under Restructuring Environment (전력산업 구조개편 환경에서 비선형 내점법의 최적조류계산에 의한 전력조류 및 한계계수에 관한 연구)

  • 정민화;남궁재용;권세혁
    • Journal of Energy Engineering
    • /
    • v.11 no.4
    • /
    • pp.291-298
    • /
    • 2002
  • This paper presents a practical methodology that can analysis power flow and marginal factors based on optimal power flow (OPF) of power systems under restructuring environment. First of all, to evaluate useful marginal factors, nonlinear optimization problems of minimum fuel cost and minimum transmission loss are formulated and solved by nonlinear primal-dual interior point method. Here, physical constraints considered in the optimization problems are the limits of bus voltage. line overloading, and real & reactive power generation. Also, an evaluation method of marginal price and marginal transmission loss is presented based on sensitivities calculated by the two OPF problems. Especially, to reflect the cost related to transmission losses in the competitive electricity market, an analysis method of MLF (marginal loss factor) is pro-posed. Numerical results on IEEE RTS 24 show that the proposed algorithm is effective and useful for analysis of power market price.