Total System Inertia (H) - power system
Total System Inertia (H) - power system
(OP)
Hello guys,
I've been asked to provide the total system inertia (H) of my power system. This is for a dynamic stability study. Any ideas on how to calculate this number?
Thank you!
I've been asked to provide the total system inertia (H) of my power system. This is for a dynamic stability study. Any ideas on how to calculate this number?
Thank you!






RE: Total System Inertia (H) - power system
RE: Total System Inertia (H) - power system
H=0.231*WR^2*(rev/min)^2/MVA/10^3 [J/VA] Eq.88
See:IEEE 399/1990 ch.4.9.3.3.2 The H Constant
RE: Total System Inertia (H) - power system
It's a rather large system >2000 MW of installed capacity with a 230/115kV transmission system.
7another4:
I have the individual H values for each unit. I'm looking for an equivalent value (or aggregate) of the system.
Thank you for your help!
RE: Total System Inertia (H) - power system
RE: Total System Inertia (H) - power system
Thank you!
RE: Total System Inertia (H) - power system
Presuming that you have loads connected within your system - these will also have inertia from any rotating machinery.
RE: Total System Inertia (H) - power system
This was actually the only way I was thinking I could do it.... so your response confirms my assumption.
Thank you for your help!
RE: Total System Inertia (H) - power system
RE: Total System Inertia (H) - power system
For most dynamic studies, the answer is no. In order to simplify the system requires modal analysis and Guyan reduction.
The mass/spring/Force system has direct mathematical analogy to the linearized H / X / Power system (linearization required to convert an X to a single value of K).
A little thought will tell you it is valid to simply add together the masses (H's) only when studying transients that involve frequencies which are much lower than the resonant frequencies of the multi-degree of freedom system. In that case the springs act rigid (the interconnecting X's act like short ciruits).
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(2B)+(2B)' ?
RE: Total System Inertia (H) - power system
RE: Total System Inertia (H) - power system
The IEEE paper search "WECC" "system" "inertia"