• Title/Summary/Keyword: Power System Stabilization

Search Result 267, Processing Time 0.024 seconds

Technology Development for Stabilization of PV Independent System (태양광발전시스템 독립계통 안정화 기술개발)

  • Hong, Kyungjin
    • The Journal of the Institute of Internet, Broadcasting and Communication
    • /
    • v.19 no.5
    • /
    • pp.181-186
    • /
    • 2019
  • In order to reduce the fossil fuels consumed in conventional commercial independent diesel generators in the same environment as the island area, it is necessary to develop a photovoltaic system that will bear more than 40% of the independent system capacity. For this development, it is necessary to develop a high-capacity inverter that can improve the stability of the independent system installed in the island area and supply high-quality power to the load. In addition, the EMS power generation control system for the independent grid photovoltaic power generation system is a parallel operation power control system of the diesel generator connected with the solar power generation system. It controls the output of the diesel generator according to the load ratio and the solar power generation, A stable supply system is needed. This independent grid photovoltaic generation system can increase the solar power supply to the independent system area and increase the power stability of the independent system and further reduce the use of fossil fuel due to the ineffective power control of the independent system. It is expected that the economy will be secured early.

Remote On-line Determination of the Load Rate Limit of Generation in AGC (AGC 운용에 있어서의 원격 On-line 최대 증감발율 취득 기법)

  • Kwon, Soon-Man;Jeon, Dong-Hoon;Moon, Won-Yong;Kim, Suk-Joo
    • Proceedings of the KIEE Conference
    • /
    • 2000.11a
    • /
    • pp.119-121
    • /
    • 2000
  • The possibility of a remote on-line determination of the maximum load rates that are basically set at generation plants is investigated in automatic generation control (AGC) system. Energy management system (EMS) generates a test input to a remote power plant to get the samples of the generator output. Then from the samples it can be attempted to determine an approximate value of the load rate limit set by the operator. It is shown in computer simulation that in actual power plants the limit can be approximately determined from the input-output characteristics of the plants for a unit-step input.

  • PDF

Adaptive Fuzzy Excitation Controller for Power System Stabilization (전력계통 안정화를 위한 적응 퍼지 여자 제어기)

  • Park, Jang-Hyun;Chang, Young-Hak;Lee, Jin;Moon, Chae-Joo
    • Proceedings of the KIPE Conference
    • /
    • 2005.07a
    • /
    • pp.693-696
    • /
    • 2005
  • We propose a robust adaptive fuzzy controller for the transient stability and voltage regulation of a single-machine inflnite bus power system. The proposed control scheme is based on the input-output linearization to eliminate the system nonlinearities. To deal with uncertainties due to a parameter variation or a fault, we introduce fuzzy systems with universal function approximating capability which estimate the uncertainties on-line.

  • PDF

A Study of Grid-Connected PV System with Power Control Structure

  • Vu, Trung-Kien;Bae, Youngsang;Oh, Seongjin
    • Proceedings of the KIPE Conference
    • /
    • 2012.07a
    • /
    • pp.329-330
    • /
    • 2012
  • The rising popularity of renewable energy sources resulted in development of the units of higher rated powers, where the large-scale plants and grid-connected type solar power systems are increased. Therefore, the importance of grid stabilization, which depends on each country or system-type, has been strengthened by different grid-codes or certifications. In this paper, the control scheme of three-phase photovoltaic system is enhanced, where both injected active and reactive powers are simultaneously controlled with the consideration of the certification of the Germany Association of Energy and Water Industries (BDEW). Experimental results are shown to verify the theoretical analysis.

  • PDF

Passivity-based Controller Design for Induction Motor Driven by Doubly-fed Induction Generator (이중권선 유도발전기로 구동되는 유도전동기의 수동성기반제어기 설계)

  • Lee S.C.;Kim J.H.
    • Proceedings of the KIPE Conference
    • /
    • 2003.07b
    • /
    • pp.639-643
    • /
    • 2003
  • We are interested in this paper on the control of an electromechanical system consisting of a doubly-fed induction generator(DFIG), driven by a prime mover that can supply or extract mechanical power, e.g., a flywheel inertia, and an induction motor(IM). The stator of the Induction machine is connected to the stator of the generator whose rotor voltage is regulated by a bidirectional converter. The main interest of this configuration is that it permits a bidirectional power flow between the motor, which may operate in regenerative mode, and the generator We propose a passivity-based controller to regulate the motor mechanical speed. Since this kind of controllers achieve stabilization via energy balancing, regulation of the power flow in the system is naturally incorporated. Simulation results are presented to illustrate the main points of our paper.

  • PDF

A Study on the Structure of Turbulent Diffusion Flame Behind the Hollowed Flame Holder(II) (중앙분공형 보염기 후류에 안정된 난류확산화염의 구조에 관한 연구(II))

  • Kang, I.G.;Lee, W.S.;Moon, J.K.;Lee, D.H.
    • Journal of Power System Engineering
    • /
    • v.3 no.3
    • /
    • pp.29-35
    • /
    • 1999
  • The purpose of study is to investigate the flame stability and structure of turbulent diffusion flame behind the hollowed flame holder, which is located on the waste gas coming out from the test furnace. PDFs and Power Spectra technique of fluctuating temperature and ion current measurement were needed for this purpose. We discussed that the three types of stabilized flames were found as the result of post study. In this paper, we established the stability mechanism near the flame holder.

  • PDF

A Study on Convergence Security of Power Generation Control System (발전 제어시스템의 융합보안 연구)

  • Lee, Daesung
    • Convergence Security Journal
    • /
    • v.18 no.5_1
    • /
    • pp.93-98
    • /
    • 2018
  • Korea Hydro & Nuclear Power Co., Ltd., Korea Electric Power Corporation, and Korea South-East Power Corporation are major infrastructure facilities of power supplying countries. If a malicious hacking attack occurs, the damage is beyond the imagination. In fact, Korea Hydro & Nuclear Power has been subjected to a hacking attack, causing internal information to leak and causing social big problems. In this paper, we propose a strategy and countermeasures for stabilization of various power generation control systems by analyzing the environment and the current status of power generation control system for convergence security research, which is becoming a hot issue. We propose a method to normalize and integrate data types from various physical security systems (facilities), IT security systems, access control systems, to control the whole system through convergence authentication, and to detect risks through fusion control.

  • PDF

DC-Voltage Regulation for Solar-Variable Speed Hybrid System (태양광 기반의 가변속 하이브리드 시스템을 위한 직류 전압 제어)

  • Niyitegeka, Gedeon;Lee, Kyungkyu;Choi, Jaeho;Song, Yujin
    • The Transactions of the Korean Institute of Power Electronics
    • /
    • v.21 no.3
    • /
    • pp.231-237
    • /
    • 2016
  • Recently, the interest in DC systems to achieve more efficient connection with renewable energy sources, energy storage systems, and DC loads has been growing extensively. DC systems are more advantageous than AC systems because of their low conversion losses. However, the DC-link voltage is variable during operation because of different random effects. This study focuses on DC voltage stabilization applied in stand-alone DC microgrids by means of voltage ranges, power management, and coordination scheme. The quality and stability of the entire system are improved by keeping the voltage within acceptable limits. In terms of optimized control, the maximum power should be tracked from renewable resources during different operating modes of the system. The ESS and VSDG cover the power shortage after all available renewable energy is consumed. Keeping the state of charge of the ESS within the allowed bands is the key role of the control system. Load shedding or power generation curtailment should automatically occur if the maximum tolerable voltage variation is exceeded. PSIM-based simulation results are presented to evaluate the performance of the proposed control measures.

A Study on ESS-based hybrid power generation system with easy expansion (증설이 용이한 ESS기반 하이브리드 발전시스템 연구)

  • Kim, Hee-Chul
    • Journal of Convergence for Information Technology
    • /
    • v.9 no.1
    • /
    • pp.68-73
    • /
    • 2019
  • This study is the central axis of the MG (Micro-Grid) configuration and it has the link through the modular hybrid power source and the DC bus, and it provides the function to detect and block the illegal connection by using the standard socket, And to achieve stabilization. Development of power conversion device, smart distribution panel, integrated control system and efficient demand management are required, and compatibility with MG whole system is urgent. This is a hybrid power generation system that is safe with a common power connection protocol and can be easily connected to anyone. This makes it easy to manage data and prepare for expansion of various manufacturers' systems.

A Design of Power System Stabilization for SVC System Using a RVEGA (실 변수 엘피트주의 유전알고리즘을 이용한 SVC 계통의 안정화 장치의 설계)

  • Chung, Hyeng-Hwan;Hur, Dong-Ryol;Lee, Jeong-Phil;Wang, Yong-Peel
    • The Transactions of the Korean Institute of Electrical Engineers A
    • /
    • v.50 no.7
    • /
    • pp.324-332
    • /
    • 2001
  • In this paper, it is suggested that the selection method of parameter of Power System Stabilizer(PSS) with robustness in low frequency oscillation for Static VAR Compensator(SVC) using a Real Variable Elitism Genetic Algorithm(RVEGA). A SVC, one of the Flexible AC Transmission System(FACTS), constructed by a fixed capacitor(FC) and a thyristor controlled reactor(TCR), is designed and implemented to improve the damping of a synchronous generator, as well as controlling the system voltage. The proposed PSS parameters are optimized using RVEGA in order to maintain optimal operation of generator under the various operating conditions. To decrease the computational time, real variable string is adopted. To verify the robustness of the proposed method, we considered the dynamic response of generator speed deviation and generator terminal voltage by applying a power fluctuation and three-phase fault at heavy load, normal load and light load. Thus, we prove the usefulness of proposed method to improve the stability of single machine-infinite bus with SVC system.

  • PDF