A study of collaborative operation between a new energy type dispersed power supply system and SMES by modified Euler type moving average prediction model

Abstract

SUMMARYIn this paper, the modified Euler type Moving Average Prediction (EMAP) model is proposed in order to operate a dispersed power supply system using new energy in autonomous mode. Furthermore, the EMAP model is used to operate a new type of dispersed power supply system consisting of a large-scale photovoltaic system (PV), a fuel cell (FC), and a small-scale superconducting magnetic energy storage system (SMES). This distributed power supply system can meet the multiple-quality electric power requirements of customers, and ensures voltage stability and UPS (Uninterruptible Power Supply) functions as well. Each subsystem of this distributed power supply contributes to the above-mentioned system performance with its own excellent characteristics. Moreover, the response characteristics of this system are confirmed by simulation with PSIM software, and, using collaborative operation under the EMAP model, the required capacity of SMES to compensate the fluctuation of both PV output and load demand is examined by simulation, using MAT-LAB/Simulink.

A study on collaborative operation method for a new energy type dispersed power supply system by AC-EMAP model

“…2(a), investigating required EDLC capacity [4][5][6]. In order to compare simulation results for these models, simulations were performed for N/M-point MA model, M-division N-point EMAP model with M and N parameters of 8 and 1920, respectively, as well as AC-EMAP model with variable parameters.…”

“…Considering that prediction procedure of smoothed component of fluctuating load is effective for capacity reduction of the energy storage for new energy type dispersed power supply, the authors previously proposed a modified Euler type Moving Average Prediction (EMAP) model, as one of the above-mentioned collaborative methods, which was applied to a new energy type dispersed power supply to be operated in autonomous mode, consisting of fuel cells (FC), photovoltaic array (PV) as well as electric double layer capacitor (EDLC) with rapid charging and discharging characteristics [4][5][6]. It was reported that this system as well as the collaborative operation method are feasible, and that the EMAP model is effective for reduction of EDLC capacity compared to the usual moving average (MA) model.…”

A study of operation characteristics of UPFC type dispersed power supply system with FC, PV and EDLC by improved EMAP model

“…However, the data processed by the MA method shows a certain time delay (group delay time) as compared to the original time series signals, and the required capacity of EDLC becomes large. In order to avoid this drawback, the authors already proposed EMAP model, the details of which were fully explained already in reference [7].…”

“…Applying Euler method to the MA model, the sum of data processed by the MA method and its derivative multiplied by the delay time can express approximately the real MA processed data after the delay time. This is the basic concept of the modified Euler type Moving Average Prediction (EMAP) model proposed by the authors in reference [7].…”

“…Therefore, the EDLC output of EMAP model converges upon zero, whereas that of MA model converges upon a constant value as shown in Fig.3. In order to mitigate the excessive impact of the derivative, M division N points EMAP model was developed [7]. The outline of M division N points EMAP model is as follows.…”