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

  • Thread starter Serena_hm
  • Start date
  • Tags
    Bus
In summary, the conversation discusses setting MVAR limits of a Slack bus as zero and the meaning of the minus sign in the limit values. It also mentions the possibility of exceeding the limits and asks for further clarification on the program being used.
  • #1
Serena_hm
18
2
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.
 
Engineering news on Phys.org
  • #2
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?)
 

1. What is a Slack Bus in power systems?

A Slack Bus, also known as a Swing Bus, is a reference bus in a power system that is used to set the voltage magnitude and phase angle of the system. It is typically connected to a large generator or an infinite bus, and is used to maintain the system's balance and stability.

2. What is the purpose of the Slack Bus in a power system?

The Slack Bus is used to represent the external power supply to the system and is responsible for providing the necessary power to meet the demand. It also acts as a reference point for voltage and phase angle, allowing the system to maintain a stable voltage profile.

3. How is a Slack Bus different from a PV Bus?

A PV Bus, or a Voltage-Controlled Bus, is a bus in a power system that is able to adjust its voltage magnitude in order to maintain a certain power output. In contrast, a Slack Bus has a fixed voltage magnitude and is not able to control its power output. Additionally, a PV Bus can have both active and reactive power injections, while a Slack Bus only has an active power injection.

4. Can a Slack Bus have a load connected to it?

No, a Slack Bus cannot have a load connected to it. This is because the Slack Bus is a reference bus and is only responsible for providing power to the system, not consuming it. Loads are typically connected to other buses in the system, such as a PQ Bus.

5. What happens if the voltage magnitude at the Slack Bus is changed?

If the voltage magnitude at the Slack Bus is changed, it will affect the entire system's voltage profile. This can cause an imbalance in the system and potentially lead to voltage instability. Therefore, it is important to carefully monitor and control the voltage at the Slack Bus to maintain a stable system.

Similar threads

Gauss - Seidel Load Flow Analysis‏
    • Engineering and Comp Sci Homework Help
Replies
3
Views
15K

Hot Threads

Recent Insights

Back
Top