# DC Generators Parallel Operation

Discussion in 'Homework Help' started by Ata Nams, May 28, 2013.

1. ### Ata Nams Thread Starter New Member

May 28, 2013
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0
A 100 KW load is connected across the terminals to two paralleled DC generators. How load sharing is done, is it that 50 - 50 KW that two generators shre, is it 30-70?? comment please?

2. ### Ramussons Well-Known Member

May 3, 2013
794
144
Normally, load sharing in such cases is balanced; meaning load is equally distributed.
Technically, you can force uneven distribution of loads, like in case of stress tests, or if the generators are not of eq2ual capacity.
In practice, only Power Sources (generators -DC/AC, power supplies, engines - locomotives, aircraft, ships,...) of same capacities are paralled for load sharing.

Ramesh

3. ### Ata Nams Thread Starter New Member

May 28, 2013
7
0
That means in parallel operation of DC Generators of same rating, the load shared will b 50-50. are you sure, because its for my viva grades.

4. ### Ramussons Well-Known Member

May 3, 2013
794
144
Technically, you can force uneven distribution of loads.

Ramesh

5. ### WBahn Moderator

Mar 31, 2012
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7,700
If the generators are truly identical, then in theory they will share equally. Given two ideal generators, the degree of sharing is indeterminate because any sharing fraction is consistent. In practice, the output characteristics of the generators will include behavior, such as output impedance, that will provide feedback. For instance, as one generator is loaded, its speed will tend to drop and hence it's output voltage will tend to drop, but that results in the other generator taking on more of the load. For generators with similar output characteristics, the sharing will usually be roughly equal.

6. ### t_n_k AAC Fanatic!

Mar 6, 2009
5,448
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The only exception might be if the identical DC generators were run as separately excited units and the field excitation in each was intentionally made different. This wouldn't make much practical sense unless the were some advantage in so doing.