Can Zero MVAR Limits Be Set on a Slack Bus During Load Flow Analysis?

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SUMMARY

Setting MVAR limits of a Slack bus to zero for both maximum and minimum limits during load flow analysis is technically possible but will likely result in non-convergence of the solution. The negative sign in the limit indicates whether the reactive power is leading or lagging. If the Slack bus generates -373 MVAR, it indicates that the limit has been exceeded, as it surpasses the minimum limit of -42.7 MVAR. The excitation level of 105% suggests that the system is operating above its nominal capacity.

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Electrical engineers, power system analysts, and students involved in load flow analysis and reactive power management will benefit from this discussion.

Serena_hm
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Question related to Slack bus ( help please ) !

Can we set the MVAR limits of a Slack bus as Zero ( for both MAx. and Min. limits ) during operating load flow program !?

and what does the minus sign exactly mean when it's written in the limit , such this one :
Qmin. (MVAR) = -42.7
Qmax. (MVAR ) = 97

if the slack generates -373...did the limit is already exceeded !?
PS : excitation is 105%

thanks for your attention.
 
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Serena_hm said:
Can we set the MVAR limits of a Slack bus as Zero ( for both MAx. and Min. limits ) during operating load flow program !?

You can, but you probably will not converge on a solution.

and what does the minus sign exactly mean when it's written in the limit , such this one :
Qmin. (MVAR) = -42.7
Qmax. (MVAR ) = 97

Sign denotes leading vs. lagging.

if the slack generates -373...did the limit is already exceeded !?


PS : excitation is 105%

thanks for your attention.

Which program are you using? Can you post your power flow diagram?
(Is this homework?)
 

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