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RISS 인기검색어
- 검색키워드
- 저자 : T.Funabashi (검색결과 4 건)
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Optimized Operation and Stabilization of Microgrids with Multiple Energy Resources
T.Tanabe,Y.Ueda,S.Suzuki,T.Ito,N.Sasaki,T.Tanaka,T.Funabashi,R.Yokoyama 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
A microgrid supply/demand control system is proposed. In this control system, operation planning is realized based on generation and load forecasting by using artificial neural network and fuzzy systems. Unit commitment of generations includes start/stop of power generations and energy storages. Load following function is accomplished based on PI control scheme. To compensate for the power fluctuation in microgrid, power system stabilizer with EDLC is proposed..
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Datta, M.,Senjyu, T.,Yona, A.,Funabashi, T.,Chul-Hwan Kim IEEE 2009 IEEE transactions on energy conversion Vol.24 No.1
<P>A photovoltaic (PV) system's power output is not constant and fluctuates depending on weather conditions. Fluctuating power causes frequency deviations and reduction in reliability of the isolated power utility or microgrid when large output power from several PV systems is penetrated in the utility. In this paper, to overcome these problems, a simple coordinated control method for leveling the fluctuations of combined power output from multiple PV systems is proposed. The conflicting objective of output power leveling and acquisition power increase is achieved by means of the proposed method. Here, output power command is generated in two steps: central and local. Fuzzy reasoning is used to generate the central leveling output power command considering insolation, variance of insolation, and absolute average of frequency deviation. In local step, a simple coordination is maintained between central power command and local power commands by producing a common tuning factor. Power converters are used to achieve the same output power as local command power employing PI control law for each of the PV generation systems. The proposed method is compared with the method where a modified maximum power point tracking control is used for smoothing the short-term change in each of the PV system's output. Simulation results show that the proposed method is effective for leveling output power fluctuations and feasible to reduce the frequency deviations of the isolated power utility to maintain reliability.</P>
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LQG Design for Megawatt-Class WECS With DFIG Based on Functional Models' Fidelity Prerequisites
Muhando, E.B.,Senjyu, T.,Uehara, A.,Funabashi, T.,Chul-Hwan Kim IEEE 2009 IEEE transactions on energy conversion Vol.24 No.4
<P>With the increasing trend of connecting high penetrations of wind energy conversion systems (WECSs) to the transmission networks comes the challenge of updating the grid code for the connection of megawatt-class wind turbines. Starting with each WECS entity in the wind farm, the specifications would require the ability to complement some of the power system control services-voltage and frequency control-currently carried out by conventional synchronous generation. This paper investigates output power stability of a WECS in a highly fluctuating wind environment. Based on a performability model, a control strategy is devised for maximizing energy conversion in low to medium winds, and maintaining rated output in above rated winds while keeping torsional torque fluctuations to a minimum. Control is exercised via collective blade pitch control as well as generator torque control. The fundamental philosophy behind the proposed control strategy for the wind turbine coupled to an asynchronous doubly fed induction generator is general and can be easily extended to other WECS configurations.</P>
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Decentralised control of voltage in distribution systems by distributed generators
Tanaka, K,Oshiro, M,Toma, S,Yona, A,Senjyu, T,Funabashi, T,Kim, C-H IET 2010 IET GENERATION TRANSMISSION AND DISTRIBUTION Vol.4 No.11
<P>Recently, renewable energy such as wind turbine generators and photovoltaic systems are introduced as distributed generators (DGs). Connection of a large amount of DG causes voltage deviation beyond the statutory range in distribution systems. Reactive power control of inverters interfaced with DGs is one of the solutions against this problem. Additionally, reactive power control has a possibility to contribute to the reduction of distribution loss. In this study, the authors propose a voltage control method in distribution systems by reactive power control of inverters interfaced with DGs. The proposed method has been developed in order to reduce distribution loss and voltage regulation into statutory range without any telecommunication. In the proposed method, each interfaced inverter controls reactive power based on voltage control reference, which is calculated from self-information. The calculation rule of control reference has been developed using optimal data which consist of relations between randomly given inputs and corresponding optimal outputs, which are calculated by an optimisation technique. Simulations are conducted to show the effectiveness of the proposed method.</P>
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