500 MW급 해상풍력발전단지 연계에 따른 계통안정도 분석

최혜원,최현준,정인성,김태기,최상진,김연희 한국풍력에너지학회 2021 풍력에너지저널 Vol.12 No.1

Wind energy was selected as a way to achieve the renewable energy 3020 implementation plan. Wind resources are clean energy and are among the renewable energy sources with excellent economics, efficiency, and environmental properties. Wind resources are divided into land and sea. Offshore wind power generation has a relatively high wind energy density compared to onshore wind power generation. As a result, the offshore wind power industry, which builds wind farms with higher energy density, is expanding worldwide. In the case of the offshore wind power industry, large and extra-large wind farm construction is being carried out by utilizing geographical advantages. There are also plans to create a large domestic offshore wind farm. Therefore, it is expected that the capacity of offshore wind farms connected to the power system will gradually increase. In this paper, the effect on the power system when a 500 MW-class offshore wind farm is connected to the system is analyzed by simulating various presumed accidents and analyzing the system’s stability.

Modelica-based dynamic analysis and design of lift-generating disk-type wind blade using computational fluid dynamics and wind tunnel test data

Yoo, Yeongmin,Lee, Soyoung,Yoon, Jaehyun,Lee, Jongsoo Elsevier 2018 Mechatronics Vol.55 No.-

<P><B>Abstract</B></P> <P>Wind power generation research and application technology have received much attention in the development of renewable energy. However, the traditional blade-rotating type wind power system has a number of drawbacks such as natural landscaping damage, flow-induced noise, and shadow flickering problems. In this paper, we propose a lift-generating disk-type blade power generation mechanism that can effectively generate wind power even with a simple structure considering the problems of the existing systems. Data on the lift force in relation to the shape of the designed blade were derived through a computational fluid dynamics simulation, and the Modelica language was used to model the integrated multi-physics wind power system. Then, a wind tunnel test was conducted using a small-scale model of the disk-type blade created to verify the simulation. The experimental results were in good agreement with the simulated results. Thus, we validated the modeling of the wind power system and applied the law of similarity to obtain the generator power output prediction results for the actual scale model.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Suggestion of a novel lift-generating disk type wind power system. </LI> <LI> Integrated simulation of proposed system using Modelica. </LI> <LI> Verification of Modelica simulation result by wind tunnel test data. </LI> <LI> Prediction of power generation of actual scale model by similarity law. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

계통연계형 풍력발전 시스템의 모선전압에의 영향

김세호 제주대학교 공과대학 첨단기술연구소 2002 尖端技術硏究所論文集 Vol.13 No.1

In recent years wind turbine technology has undergone rapid development in response to the demands for increased use of renewable sources of energy. Using a wind turbines for production of electrical energy require reliable operation. The increased share of wind power in electric power system makes it necessary to have grid-friendly interfaces between the wind turbines and the grid in order to maintain power quality. Increasingly wind turbines are being connected into electricity distribution systems. The grid-connected wind power stations have many impacts on the power system such as voltage variations, harmonics, flickers and protection. This paper shows the influence of grid-connected wind power generation system on bus voltage. As shown in this paper, it is necessary to develop measurement program and system in order to analysis and ensure the proper operation of grid-connected wind power generation system.

Optimizing the Electricity Price Revenue of Wind Power Generation Captures in the South Korean Electricity Market

Eamon Byrne(에먼 번),Kim Hyun-Goo(김현구),Kang Yong-Heack(강용혁),Yun Chang-Yeol(윤창열) 한국태양에너지학회 2016 한국태양에너지학회 논문집 Vol.36 No.1

How effectively a wind farm captures high market prices can greatly influence a wind farm’s viability. This research identifies and creates an understanding of the effects that result in various capture prices (average revenue earned per unit of generation) that can be seen among different wind farms, in the current and future competitive SMP (System Marginal Price) market in South Korea. Through the use of a neural network to simulate changes in SMP caused by increased renewables, based on the Korea Institute of Energy Research’s extensive wind resource database for South Korea, the variances in current and future capture prices are modelled and analyzed for both onshore and offshore wind power generation. Simulation results shows a spread in capture price of 5.5% for the year 2035 that depends on both a locations wind characteristics and the generations’ correlation with other wind power generation. Wind characteristics include the generations’ correlation with SMP price, diurnal profile shape, and capacity factor. The wind revenue cannibalization effect reduces the capture price obtained by wind power generation that is located close to a substantial amount of other wind power generation. In onshore locations wind characteristics can differ significantly/ Hence it is recommended that possible wind development sites have suitable diurnal profiles that effectively capture high SMP prices. Also, as increasing wind power capacity becomes installed in South Korea, it is recommended that wind power generation be located in regions far from the expected wind power generation ‘hotspots’ in the future. Hence, a suitable site along the east mountain ridges of South Korea is predicted to be extremely effective in attaining high SMP capture prices. Attention to these factors will increase the revenues obtained by wind power generation in a competitive electricity market.

Stochastic Stability Analysis of the Power System Incorporating Wind Power using Measurement Wind Data

Panom Parinya,Anawach Sangswang,Krissanapong Kirtikara,Dhirayut Chenvidhya 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.3

This paper proposes an alternative method to evaluate the effect of wind power to the power system stability with small disturbance. Alternatively, available techniques for stability analysis of a power system based on deterministic methods are less accurate for high penetration of wind power. Numerical simulations of random behaviors are computationally expensive. A stochastic stability index (SSI) is proposed for the power system stability evaluation based on the theory of stochastic stability and energy function, specifically the stochastic derivative of the relative well-defined energy function and the critical energy. The SSI is implemented on the modified nine-bus system including wind turbines under different conditions. A doubly-fed induction generator (DFIG) wind turbine is characterized and modeled using measured wind data from several sites in Thailand. Each of the obtained wind power data is analyzed. The wind power effect is modeled considering the aggregated effect of wind turbines. With the proposed method, the system behavior is properly predicted and the stability is quantitatively evaluated with less computational effort compared with conventional numerical simulation methods.

Development of Efficient Operation Mode for Wind-Diesel Hybrid System

Furqan Asghar,Se-Yoon Kim,Sung Ho Kim 한국지능시스템학회 2014 한국지능시스템학회논문지 Vol.24 No.5

Hybrid wind Diesel stand-along systems are considered economically viable and effective to create balance between production and load demand in remote areas where the wind speed is considerable for electric generation, and also, electric energy is not easily available from the grid. In Wind diesel hybrid system, the wind energy system is the main constitute and diesel system forms the back up. This type of hybrid power system saves fuel cost, improves power capacity to meet the increasing demand and maintains the continuity of supply in the system. Problem we face in this system is that even after producing enough power through wind turbine system, considerable portion of this power needs to be dumped due to short term oversupply of power and to maintain the frequency within close tolerances. As a result remaining portion of total energy supplied comes from the diesel generator to overcome the temporal energy shortage. This scenario decreases the overall efficiency of hybrid power system. In this study, efficient Simulink modeling for wind-diesel hybrid system is proposed and some simulations study is carried out to verify the feasibility of the proposed scheme.

이중여자 유도발전기 기반 풍력발전 시스템의 퍼지 모델링 및 안정도 해석

김진규(Jin Kyu Kim),주영훈(Young Hoon Joo) 한국지능시스템학회 2012 한국지능시스템학회논문지 Vol.22 No.1

본 논문에서는 이중여자 유도발전기 기반 가변속도 풍력발전 시스템의 퍼지 모델링 및 안정도 해석에 관하여 다루고자 한다. 일반적인 풍력발전 시스템은 복잡한 비선형성 기반 동적방정식으로 구성되며, 플랜트를 구성하는 각 파라미터 수치 역시 주변 환경에 의해 변화할 여지가 있다. 풍력발전 시스템의 해석을 위하여 본 논문에서는 비선형성 및 불확실성에 강인한 퍼지 제어 기법을 기반으로 제어이론을 구성하고자 한다. 이중여자 유도발전기 기반 풍력발전 시스템의 퍼지 모델링 및 시스템 안정화를 위한 퍼지 제어기 설계 기법이 제안된다. 해당 제어 기법은 리아푸노프 기반 안정도 해석에 의해 점근 안정도를 보장받게 되며, 가상 시뮬레이션을 통한 시스템 효율성을 입증하게 된다. This paper propose the robust stability algorithm for controlling a variable speed wind power system which based on doubly-fed induction generator (DFIG). The control object in the wind power system enables the rotor to rotate without any physical contact by using magnetic force. Generally, the system dynamics of the wind power system has severe nonlinearity and uncertainty so that it is not easy to obtain the control objective. For solving these problems, we propose the fuzzy modelling and robust control algorithm for wind power system. The sufficient conditions for robust controller are obtained in terms of solutions to linear matrix inequalities (LMIs). Simulation results for wind power system based on DFIG are demonstrated to visualize the feasibility of the proposed method.

Development of Efficient Operational Mode for Wind-Diesel Hybrid System

Furqan Asghar,김세윤,김성호 한국지능시스템학회 2014 한국지능시스템학회논문지 Vol.24 No.5

Hybrid wind Diesel stand-alone power systems are considered economically viable and effective to create balance betweenproduction and load demand in remote areas where the wind speed is considerable for electric generation, and also, electricenergy is not easily available from the grid. In Wind diesel hybrid system, the wind energy system is the main constituteand diesel system forms the back up. This type of hybrid power system saves fuel cost, improves power capacity to meetthe increasing demand and maintains the continuity of supply in the system. Problem we face in this system is that evenafter producing enough power through wind turbine system, considerable portion of this power needs to be dumped due toshort term oversupply of power and to maintain the frequency within close tolerances. As a result remaining portion of totalenergy supplied comes from the diesel generator to overcome the temporal energy shortage. This scenario decreases theoverall efficiency of hybrid power system. In this study, efficient Simulink modeling for wind-diesel hybrid system is proposedand some simulations study is carried out to verify the feasibility of the proposed scheme.

풍력발전 설비가 전력계통의 전력품질에 미치는 영향

권동철(Dong-Chul Kwon),이동영(Dong-Young Yi) 한국조명·전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.9

In this study, we have investigated the effect of the wind power generation facilities on the power quality of interconnected wind power generation system. When the wind power generation facility was connected to the distribution system, whether the wind power generation is under operation or not, voltage variation was increased to 0.34%, peak factor of current was increased to 0.145 and phase difference was increased to 0.6° deviation(2.5 times). Harmonic current % in orders was increased to 29.4%, 14.7% and 3.73% at 3rd, 5th and 9th orders respectively. When the wind power generation facilities were not under operation, harmonic current THD(263.7%) was above the technical criteria of domestic power company(5%) and also, harmonic current % in orders(12.4%, 14.2%, 19.4% and 8.06% at 3rd, 5th, 7th and 9th respectively) were above the technical criteria of domestic power company(below 4% under 11th orders). Therefore, it was confirmed that the wind power generation facility, when it was connected to the existing distribution system, made bad influence on the power qualities.

Application of Fuzzy PI Control Algorithm as Stator Power Controller of a Double-Fed Induction Machine in Wind Power Generation Systems

Gyo-Bum Chung,Jaeho Choi 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.1

This paper addresses the output control of a utility-connected double-fed induction machine (DFIM) for wind power generation systems (WPGS). DFIM has a back-to-back converter to control outputs of DFIM driven by the wind turbine for WPGS. To supply commercially the power of WPGS to the grid without any problems related to power quality, the real and reactive powers (PQ) at the stator side of DFIM are strictly controlled at the required level, which in this paper is realized with the Fuzzy PI controller based on the field orientation control. For the Sinusoidal Pulse Width Modulation (SPWM) converter connected to the rotor side of DFIG to maintain the controllability of PQ at the state side of DFIM, the DC voltage of the DC link capacitor is also controlled at a certain level with the conventional Proportion-Integral (PI) controller of the real power. In addition, the power quality at the grid connected to the rotor side of DFIM through the back-to-back converter is maintained in a certain level with a PI controller of the reactive power. The controllers for the PQ at the stator side of DFIM, the DC link voltage of the back-to-back inverter and the reactive power at the grid connected to the rotor side of DFIM are designed and simulated in the PSIM program, of which the result verifies the performance of the proposed controllers.