6 research outputs found

    Functional PCS power supply system with EV battery storage for stable PV power delivery

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    This research proposes a residential Photovoltaic-Power Conditioning Subsystem (PV-PCS) in a functional and stable power supply system with battery storage (Electric Vehicle [EV] storage etc.) to reduce PV output fluctuation. In PV power generation, PV power fluctuations caused by weather changes make it difficult to obtain stable power output. Further, it can then be expected that this adversely affects the power system. In this paper, functional power supply system model is constructed with power fluctuation suppression control system using bidirectional DC/DC converter and existing residential PCS and EV battery storage. Furthermore, simulation results of the electric battery power suppression element of the PV power fluctuation are also shown by using Simple Moving Average (SMA) control method to suppress PV power fluctuation. PV power suppression system using existing residential PCS has an advantage that can not only suppress the energy change during normal operation but can also construct the isolated power supply in an emergency case of power supply loss. In this emergency case, EV battery storage control provides the power to critical loads during utility outage. This feature is not available without storage. Also, effectiveness of PV-PCS interconnection stable power supply system with existing residential PCS in Japan was proposed. Moreover, a basic research of solar power generation amount of solar radiation estimation and the resulting simulation on information acquisition method of solar energy capacity using Geographic Information System (GIS) are presented

    Multi-Deployment of Dispersed Power Sources Using RBF Neural Network

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    Construction of power supply system using electric vehicle for stable power delivery from PV generation

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    Abstract This research aims to propose a power supply system in which conventional photovoltaic (PV) system attains advanced functions. First, each household can use the power independently from the power system and load in the power system is reduced in the event of power shortage. Second, stable power is obtained from PV in which the output fluctuates due to the change in the amount of solar radiation. Third, PV output suppression is avoided when voltage of the distribution line is increased by the reverse power flow. Fourth, stable power is supplied to each household and refuge in the event of disaster. To achieve these, grid-connected and self-sustaining power supply system is developed by connecting a DC/DC converter between electric vehicle (EV) battery and conventional power conditioning subsystem (PCS) of PV system. In this paper, the power supply system model is presented. Also, the bidirectional DC/DC converter circuit is described in consideration of PV system installed in Kyushu Institute of Technology and of major EV in Japan. Finally, the hardware configuration of the proposed system is shown. It is considered that the effectiveness can be evaluated by constructing the proposed system

    PI-MPC Frequency Control of Power System in the Presence of DFIG Wind Turbines

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    Abstract For the recent expansion of renewable energy applications, Wind Energy System (WES) is receiving much interest all over the world. However, area load change and abnormal conditions lead to mismatches in frequency and scheduled power interchanges between areas. These mismatches have to be corrected by the LFC system. This paper, therefore, proposes a new robust frequency control technique involving the combination of conventional Proportional-Integral (PI) and Model Predictive Control (MPC) controllers in the presence of wind turbines (WT). The PI-MPC technique has been designed such that the effect of the uncertainty due to governor and turbine parameters variation and load disturbance is reduced. A frequency response dynamic model of a single-area power system with an aggregated generator unit is introduced, and physical constraints of the governors and turbines are considered. The proposed technique is tested on the single-area power system, for enhancement of the network frequency quality. The validity of the proposed method is evaluated by computer simulation analyses using Matlab Simulink. The results show that, with the proposed PI-MPC combination technique, the overall closed loop system performance demonstrated robustness regardless of the presence of uncertainties due to variations of the parameters of governors and turbines, and loads disturbances. A performance comparison between the proposed control scheme, the classical PI control scheme and the MPC is carried out confirming the superiority of the proposed technique in presence of doubly fed induction generator (DFIG) WT
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