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Category > Management Posted 15 Feb 2018 My Price 7.00

no-load frequency

5-5.   Figure 5-31 shows a generator supplying a load. A second load is to be connected  in parallel  with the first one. The generator has a no-load frequency  of 61.0 Hz and a slope Sp  of  1 MW/Hz. Load  l consumes a real power of  1000 kW at 0.8 PF lag­ ging, while load 2 consumes a real power of 800 kW at 0.707 PF lagging.

(a)   Before the switch is closed, what is the operating frequency of the system?

(b)   After load 2 is connected, what is the operating frequency of the system?

(c)   ) After load 2 is connected, what action could an operator take to restore the sys­ tem frequency to 60 Hz?

 

 

 

 

 

 

I .I                                                                                       .

 

Load 2

 

 

 

 

FIGURE S-31

The power system in Example 5-5.

 

 

 

18

5-6.  Figure  5-38a  shows  two generators  supplying  a load.  Generator 1 has a no-load frequency of 61.5 Hz and a slope sp1 of 1MW/Hz. Generator 2 has a no-load frequency  of 61.0 Hz and  a slope sn of  1 MW/Hz. The two generators are supplying  a real

load totaling 2.5 MW at 0.8 PF lagging. The resulting system power-frequency or house diagram  is shown in Figure  5-39.

(a)   At what frequency is this system operating, and how much poweris supplied by each of the two generators?

(b)   Suppose an additional 1-MW load were attached to this power system. What would the new system frequency be, and how much power would G1 and G2 supply now?

(c)   With the system in the configuration described in part b, what will the system frequency and generator powers be if the governor set points on G2 are in­ creased by 0.5 Hz?

 

Answers

Maurice Tutor
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Status NEW Posted 15 Feb 2018 07:02 PM My Price 7.00

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