问题 问答题 简答题

简述光伏发电站的组成及原理。

答案

参考答案:

①组成:光伏阵列、防雷汇流箱、直流防雷配电柜、并网逆变器、交流配电柜

②光伏阵列的作用:将光能转换成电能。

防雷汇流箱的作用:减少了太阳能光伏阵列与逆变器之间的连线,方便维护,提高可靠性。

并网逆变器的作用:将电能转化为与电网同频、同相的正弦波电流,馈入公共电网。

交流配电柜的作用:将逆变器输出的交流电接入后,经过断路器接入电网,保证系统的正常供电,同时还能对线路电能的计量。

直流防雷配电柜的作用:将直流汇流箱输出的直流电流进行汇流,再接到逆变器。

填空题
完形填空

完形填空:(共15小题;每小题1分,满分15分)

阅读下面短文,从短文后所给各题的四个选项(A、B、C和D中选出能填入相应空白处的最佳选项。

  Once upon a time, bee-keepers killed their bees every autumn. Why, you  26  ask. Well, the answer is this. To get some  27  , bee-keepers and farmers used to  28  small wooden boxes in a corner of the farmyard. Bees would come and  29  the box with honeycomb.  30  , there was no way of getting the honey out  31  killing the bees. So they used to burn a chemical  32  the box in order to kill the bees and then take the honey.

  Now, bee-keepers  33  beehives to collect honey. In the beehive there are a number of wooden  34  with spaces between them  35  can be lifted out. In later summer, the squares, which are now  36  of honeycomb are lifted out. The squares are put in  37  special machine and turned round and round very fast for several minutes. Turning the squares round and round  38  this  39  out the honey. Then the honey is collected and  40  jars. After that the empty squares are returned to the hive for the bees to fill with honey the following year.

26. A. need               B. may                     C. should                  D. must

27. A. honey                  B. bees                     C. honeycomb                D. space

28. A. put in             B. put away             C. put off                 D. put out

29. A. fill                  B. cover                    C. supply              D. satisfy

30. A. Still                B. And                     C. However            D. So

31. A. for                 B. in                    C. by                   D. without

32. A. on                  B. close to                C. in the front of            D. far from

33. A. want           B. take                      C. use                       D. expect

34. A. squares          B. boxes             C. sticks                   D. bowls

35. A. many             B. they                     C. it                    D. which

36. A. full                 B. filled                    C . afraid                  D. emptied

37. A. the                 B. a                     C. another                D. 不填

38. A. for                 B. in                    C. like                       D. to

39. A. forces             B. makes             C. helps                    D. drives

40. A. led into          B. brought into         C. poured into          D. got into