Tham khảo tài liệu 'wind power impact on power system dynamic part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Power Characteristics of Compound Microgrid Composed from PEFC and Wind Power Generation 473 period of step input of 6 kW and 8 kW for seconds. If a wind power generator is connected to the micro-grid many fluctuations in the system response characteristics will occur in a short period. If the power produced by wind power generation is supplied to the micro-grid the dynamic characteristics of power of the micro-grid will be influenced. Figure 8 b shows the analysis result of the response error corresponding to Figure 8 a . If wind power generator is connected to the grid the response error will become large as the load of the grid becomes small. It is expected that the power range of the fluctuation of the microgrid will increase as the output of the wind power generation grows. Therefore when the load of a micro-grid is small compared with the output of wind power generator the power supply of the independent micro-grid becomes unstable. Load response characteristics of cold region houses Figure 9 a shows the power demand pattern of a micro-grid formed from ten individual houses in Sapporo in Japan and assumes a representative day in February Narita 1996 . This power demand pattern is the average value of each hour and the sampling time of analyses and the assumption time are written together on the horizontal axis. As a base load of the power demand pattern shown in Fig. 9 a F C 0 is considered as operation of kW constant load. Figure 9 b and c are the power demand patterns when adding load fluctuations 1 kW and 3 kW to Fig. 9 a at random. The variation of the load was decided at random within the limits of the range of fluctuation for every sampling time. 2 III ------ . . . ------. 0 100 200 300 400 Sampling time s 0 6 12 18 24 Assumpti on time Hour a Average power load Lindstrom et al. 2003 0 100 200 300 400 Sampling time s 0 6 12 18 24 Assumption time Hour b Fluctuation of power load is Sampling time s 0 6 12 18 24 Assumpti on time .
