• Title/Summary/Keyword: Distributed power

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Analysis of System Impact of the Distributed Generation Using EMTP with Particular Reference to Voltage Sag

  • Yeo, Sang-Min;Kim, Chul-Hwan
    • KIEE International Transactions on Power Engineering
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    • v.4A no.3
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    • pp.122-128
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    • 2004
  • With the advent of distributed generation, power systems are fundamentally impacted in regards to stability and power quality. Distributed generation has a positive impact on system restoration following a fault, higher reliability, and mitigation of effect due to voltage sag. However, distributed generation also has a negative impact on decrease of reliability such as changes of protective device setting and mal-operation. Because bulk power systems consist of various sources and loads, it becomes complicated to analyze a power system with distributed generation. The types of distributed generation are usually classified by both rotating machinery and the inverter-based system. In this paper, distributed generation is designed by rotating machinery, and the distributed system having a model of the distributed generation is simulated using EMTP. In addition, this paper presents the simulation results according to the types of distributed generation.

Analysis of the System Impact of Distributed Generation using EMTP

  • Yeo, Sang-Min;Kim, Il-Dong;Kim, Chul-Hwan;Aggarwal, Raj
    • KIEE International Transactions on Power Engineering
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    • v.4A no.4
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    • pp.201-206
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    • 2004
  • With the advent of distributed generation, power systems in general are impacted in regards to stability and power quality. Distributed generation has positive impacts on system restoration following a fault, higher reliability, and mitigation of effect due to voltage sag. However, distributed generation also has negative impacts on the decrease of reliability such as changes of protective device setting and mal-operation. Because bulk power systems consist of various sources and loads, it is complicated to analyze power systems that have distributed generation. The types of distributed generation usually are classified as the rotating machinery system and the inverter-based system. In this paper, distributed generation is designed as a synchronous generator, and the distribution system with its distributed generation model is simulated using EMTP. In addition, this paper shows the simulation results according to the types of distributed generation

Control of PCC Voltage Variation by Reactive Power Compensation of Distributed Source (분산전원의 무효전력 보상을 통한 PCC 전압 변동 제어)

  • Han, Sanghun;Lim, Jong-ung;Han, Yu;Cho, Younghoon;Choe, Gyu-ha
    • Proceedings of the KIPE Conference
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    • 2017.07a
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    • pp.180-181
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    • 2017
  • Recently as distributed source has increased, the distribution system has changed from unidirectional power flow to bi-directional power flow. This power flow causes the PCC voltage variation, which can adversely affect voltage sensitive loads. In this paper, the relation between the active power, reactive power and PCC voltage of the distributed source is analyzed, and the PCC voltage control scheme by reactive power compensation is proposed in the distributed source itself. In addition, limitations and conditions according to the standard for interconnecting distributed resources are specified and verified through simulation.

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The Development of Boiler Fuel Control Algorithm and Distributed Control System for Coal-Fired Power Plant (석탄화력발전소 보일러 연료제어 알고리즘과 분산제어시스템의 개발)

  • Lim, Gun-Pyo;Lee, Heung-Ho
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.62 no.1
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    • pp.36-44
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    • 2013
  • This paper is written for the development and application of boiler fuel control algorithm and distributed control system of coal-fired power plant by the steps of design, coding, simulation test, site installation and site commissioning test. Fuel control algorithm has the upper algorithm and it is boiler master control algorithm that controls the fuel, feed water, air by generation output demand. Generation output demand by power load influences fuel control. Because fuel can not be supplied fast to the furnace of boiler, fuel control algorithm was designed adequately to control the steam temperature and to prevent the explosion of boiler. This control algorithms were coded to the control programs of distributed control systems which were developed domestically for the first time. Simulator for coal-fired power plant was used in the test step. After all of distributed control systems were connected to the simulator, the tests of the actual power plant were performed successfully. The reliability was obtained enough to be installed at the actual power plant and all of distributed control systems had been installed at power plant and all signals were connected mutually. Tests for reliability and safety of plant operation were completed successfully and power plant is being operated commercially. It is expected that the project result will contribute to the safe operation of domestic new and retrofit power plants, the self-reliance of coal-fired power plant control technique and overseas business for power plant.

A Distributed Control Method based on Voltage Sensitivity Matrix in DC Microgrids for Improvement of Power Sharing Accuracy and Voltage Regulation Performance (직류 마이크로그리드의 전력 공유 정확도 및 전압 제어 성능 향상을 위한 전압 민감도 행렬 기반의 분산 제어 방법)

  • Lee, Gi-Young;Ko, Byoung-Sun;Lee, Jae-Suk;Kim, Rae-Young
    • The Transactions of the Korean Institute of Power Electronics
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    • v.23 no.5
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    • pp.345-351
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    • 2018
  • A distributed control method is proposed to improve the power sharing performance of bidirectional distributed generators and the voltage regulation performance of a DC bus in a DC microgrid. Voltage sensitivity analysis based on power flow analysis is conducted to analyze the structural characteristics of a DC microgrid. A distributed control method using a voltage sensitivity matrix is proposed on the basis of this analysis. The proposed method uses information received through the communication system and performs the droop gain variation method and voltage shift method without additional PI controllers. This approach achieves improved power sharing and voltage regulation performance without output transient states. The proposed method is implemented through a laboratory-scaled experimental system consisting of two bidirectional distributed generators, namely, a load and a non-dispatchable distributed generator in a four-bus ring-type model. The experimental results show improved power sharing accuracy and voltage regulation performance.

Distributed Power Control and Removal Algorithms for Multimedia CDMA Wireless Networks

  • Wang, Jui-Teng
    • Journal of Communications and Networks
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    • v.5 no.3
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    • pp.197-201
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    • 2003
  • We study in this paper both distributed power control and removal algorithms for multimedia CDMA wireless networks. In our study, users can have different data rates as well as different quality of service (QoS) requirements. We derive a necessary and sufficient condition for the fully distributed power control (FDPC) algorithm to find a feasible power set. We also prove that, if the maximal power level is used at the start, then the distributed constrained power control (DCPC) algorithm is equivalent to the FDPC algorithm. For the connection removal algorithm, we prove that the non-reinitialized removal algorithm finds a feasible power set faster and employs smaller power levels than the reinitialized one does. Performances of some connection removal criteria are also studied. Our simulation results reveal that the smallest normalized CIR (SNC) and largest CIR requirement (LCR) criteria result in smaller outage probability than the smallest CIR (SC) criterion in a multimedia environment.

A Distributed Power Optimization Method for CDMA Cellular Mobile Systems Using an Adaptive Search Scheme

  • Lee, Young-Dae
    • 제어로봇시스템학회:학술대회논문집
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    • 2003.10a
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    • pp.1982-1985
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    • 2003
  • Future cellular networks will mainly be driven by, high quality channels, high band with utilization, low power consumption and efficient network management. For a given channel allocation, the capacity and quality of communication of cellular radio systems using CDMA(Code Division Multiple Access) can be increased by using a transmitter power control scheme to combat the near-far problem. Centralized power control schemes or distributed ones to maximize the minimum signal-to-interference in each user of CDMA wireless network have been investigated. This paper has proposed a distributed power control algorithm, which employs an adaptive search scheme, in order to solve quickly the linear systems of equations for power update in CDMA cellular radio systems. The simulation results show that the proposed scheme has faster convergence rate than the typical bang-bang type of distributed power control algorithm, which has been much used as a reference algorithm in IS-95A and W-CDMA communication network.

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Distributed Power Conversion LED Driver Circuit using Parasitic Inductance (기생인덕턴스 성분을 이용한 분산형 전력변환 LED 구동회로)

  • Kim, Sang-Eon;Roh, Chung-Wook
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.2
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    • pp.117-122
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    • 2013
  • The distributed power conversion LED driver circuit using parasitic inductance is proposed in this paper. while the conventional LED driver circuit is composed of the large size devices and heatsinks, the proposed circuit can be realized with the small sized no heatsink based. since the processing power can be effectively distributed. Also by using the wire parasitic inductance of the LED string, the proposed circuit can be implemented without external magnetic device. As a result, the proposed circuit which features the small size and volume con be realized even without LED driver module(LDM) board. since, all the device can be attached to the existing LED array Module(LAM) board. Therefore, it features that cost savings and volume reduction of circuit. To confirm the validity of the proposed circuit, theoretical analysis and experimental results from a distributed power conversion LED driver circuit prototype are presented.

Renewable Power Generation Forecasting Method for Distribution System: A Review (배전시스템 운영계획을 위한 신재생에너지원 발전량 예측 방법)

  • Cho, Jintae;Kim, Hongjoo;Ryu, Hosung;Cho, Youngpyo
    • KEPCO Journal on Electric Power and Energy
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    • v.8 no.1
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    • pp.21-29
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    • 2022
  • Power generated from renewable energy has continuously increased recently. As the distributed generation begins to interconnect in the distribution system, an accurate generation forecasting has become important in efficient distribution planning. This paper explained method and current state of distributed power generation forecasting models. This paper presented selecting input and output variables for the forecasting model. In addition, this paper analyzed input variables and forecasting models that can use as mid-to long-term distributed power generation forecasting.

Implementing Distributed Optimal Power Flow Using the Alternating Direction Method

  • Chung Koohyung;Kim Balho H.;Song Kyung-Bin
    • KIEE International Transactions on Power Engineering
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    • v.5A no.4
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    • pp.412-415
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    • 2005
  • The recent requirement for faster and more frequent solutions has encouraged the consideration of parallel implementations using decentralized processors. Distributed multi-processor environments can potentially greatly increase the available computational capacity and decrease the communication burden, allowing for faster Optimal Power Flow (OPF) solutions. This paper presents a mathematical approach to implementing distributed OPF using the alternating direction method (ADM) to parallelize the OPF. Several IEEE Reliability Test Systems were adopted to demonstrate the proposed algorithm.