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What is the difference between weak grid and stiff
grid?
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D. Anthony Stewart, 35yrs in R&D/TE/Mfg, expertise in EMC design, RF,
SMPS design and PD testing
Answered May 6, 2016
Voltage sources for AC are matched by Phase Shifting transformers. Lower
impedance of sources, improves load voltage regulation effects on source voltage. 
However it also makes it more prone to surges from interruptions, solar flare
induced magneto-wobble induced fields of earth's magneto sphere and results in
saturation currents of transformers which in turn reduces phase margin and current
margin in infrastructure which can cause instability. A compliant or weak grid has
more losses and potentially poorer transient load response but potentially more
stability from massive disturbances that trigger more rapid faults. generally we want
a stronger grid to suppress disturbances better with a lower impedance distributed
over the grid with adaptive online tap changers at source and predictive failure
sensors ( such as solar flare information, earthquakes and fires )to manage the grid
from a cascading effect that caused prior major blackouts. They have learn much
from these experiences and apply it in many areas.
I am not an expert in microgrid or weak or strong grid topology but I know people
who are. Consider this analogy. Imagine how vehicle springs and shocks are tuned to
match the weight of the vehicle and road conditions. Too stiff or weak can have
resonance issues each which must be factored in protecting the weakest link( the
tires or the shock end-stop, the other moving parts or the passengers) to handle all
the expected traffic conditions, disturbances ( pot holes from winter, massive pot
holes from fracking oil nearby ( sub-terrain voids) , ice, temperature, rain etc.
The stiffness of the grid
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What is the difference between smart grid and
microgrid?
Why does Japan have two different electrical
frequencies?
How is electricity stored in the grids?
What is the internal impedance of a weak grid and
a strong grid?
What is the grid?
What is a grid beam?
What's the difference between mini-grid and
microgrid?
What is a 6 figure grid reference?
What is a grid line?
What do you mean by micro grids?
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and frequency mean re
compensate for supply demand by changing frequency rather than phase shifting
transformers. It is a complex control system with many features.
Look into IEEE Power articles < Microsoft Scholar or read books by Rohan for more
research background on Power Engineering and ask a better question.
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Guillaume De Préville, MSEE from INP-ENSEEIHT (1985)
Updated Sep 24
weak grid means that the voltage at the connecting point will be very sensitive to any
variation of the load. Strong grid means that the voltage will be not affected and will
stay unchanged. It is why it is called stiff.
Is defined the strength of the grid: capability to maintain the voltage constant
whatever the loas is.
The strength is directly linked to the impedance of the lines. if impedance is high the
strength is weak. If impedance is low the strength is strong.
Impedance of the line is inversely proportional to the short circuit current capability
at the connecting point. If short circuit current is high strength is high. If short
circuit current is low strength is weak.
Hoping that it helped.
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Kevin Baker, B.A. from University of Arizona (2005)
Answered May 7, 2016
The difference is the available short-circuit current. If the available short-circuit
current is low, any large load applied to the grid will result in a significant drop in
line voltage. If the SCCA is high, the voltage will be much less affected - "stiffer," in
What is the difference between smart grid and
microgrid?
Why does Japan have two different electrical
frequencies?
How is electricity stored in the grids?
What is the internal impedance of a weak grid and
a strong grid?
What is the grid?
What is a grid beam?
What's the difference between mini-grid and
microgrid?
What is a 6 figure grid reference?
What is a grid line?
What do you mean by micro grids?
Ask New Question
Related Questions
Home Answer Spaces Notifications
1 1
(1) What is the difference between weak grid and stiff grid? - Quora https://www.quora.com/What-is-the-difference-between-weak-grid-and-stiff-grid
2 de 4 20/11/2018, 15:33
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Add a comment...
What is the difference between smart grid and
microgrid?
Why does Japan have two different electrical
frequencies?
How is electricity stored in the grids?
What is the internal impedance of a weak grid and
a strong grid?
What is the grid?
What is a grid beam?
What's the difference between mini-grid and
microgrid?
What is a 6 figure grid reference?
What is a grid line?
What do you mean by micro grids?
Ask New Question
Related Questions
Home Answer Spaces Notifications
1 1
(1) What is the difference between weak grid and stiff grid? - Quora https://www.quora.com/What-is-the-difference-between-weak-grid-and-stiff-grid
3 de 4 20/11/2018, 15:33
What is the difference between smart grid and
microgrid?
Why does Japan have two different electrical
frequencies?
How is electricity stored in the grids?
What is the internal impedance of a weak grid and
a strong grid?
What is the grid?
What is a grid beam?
What's the difference between mini-grid and
microgrid?
What is a 6 figure grid reference?
What is a grid line?
What do you mean by micro grids?
Ask New Question
Related Questions
Home Answer Spaces Notifications
1 1
(1) What is the difference between weak grid and stiff grid? - Quora https://www.quora.com/What-is-the-difference-between-weak-grid-and-stiff-grid
4 de 4 20/11/2018, 15:33