What does "Phase jump" mean?
What does "Phase jump" mean?
(OP)
Hi everyone,
I got one clarification from one customer:
-------------------------------------------------------------------------------------------------------------------
The Renewable Power Plant shall be designed to withstand sudden phase jumps of up to 40° at the POC
without disconnecting or reducing its output. The RPP shall after a settling period resume
normal production not later than 5 sec after the operating conditions in the POC have reverted
to the normal operating conditions.
-------------------------------------------------------------------------------------------------------------------
To my mind this word "phase jump" is not very clear. Does this refer to the voltage angle of the machine?
Any one can help me out and give some clear scenarios how we can face a phase jump?
And what will be the consequence on the turbine or generaor?
BR
I got one clarification from one customer:
-------------------------------------------------------------------------------------------------------------------
The Renewable Power Plant shall be designed to withstand sudden phase jumps of up to 40° at the POC
without disconnecting or reducing its output. The RPP shall after a settling period resume
normal production not later than 5 sec after the operating conditions in the POC have reverted
to the normal operating conditions.
-------------------------------------------------------------------------------------------------------------------
To my mind this word "phase jump" is not very clear. Does this refer to the voltage angle of the machine?
Any one can help me out and give some clear scenarios how we can face a phase jump?
And what will be the consequence on the turbine or generaor?
BR





RE: What does "Phase jump" mean?
Some of us call this an angular shift with a possibility of a swing condition, or an out-of-step condition.
What would happen is the generator on an affected bus would have to adjust to the new condition, which includes changes in var flow up and down until it settles in to a new steady-state.
The size of angle shift that a generator can handle depends on the size, strength of the magnetic field, and var loading.
RE: What does "Phase jump" mean?
Thank you very much for your help.
I have some difficulties to interpretate the "voltage angle". Is it called "load angle" also? or is it angle between U & I
So it means to avoid out of step condition the excitation system has to be fast with high forcing ratio.
Could be worth to add a PSS.
RE: What does "Phase jump" mean?
RE: What does "Phase jump" mean?
"Phase jump" is just a suddenly angle shift on system voltage that occurs mainly during a short-circuit in the system.
In general it is comes with a voltage sag.
Please, see attached an example of a "phase jump".
Best Regards,
Herivelto S. Bronzeado
Brasília, Brazil
http://www.linkedin.com/profile/view?id=46319837&a...
RE: What does "Phase jump" mean?
Thank you very much for this figure and the explanation however it is now less clear :)
In the figure what do Vs and Vs represent?
So in such an event what will be the reaction of the generator? What is critical ? and how could we recover from this situation? by using a PSS or High Field forcing AVR or overdesign the generator?
Thanks
RE: What does "Phase jump" mean?
Sorry for confounding you.
vs and vs2 is the system voltage before and after a short-circuit (fault), respectively.
The generator reaction depends on the type of the wind generator. The Wind Power Plant shall be designed to withstand sudden phase jumps (up to 40°) and also voltage sags without disconnecting from the power system.
Best Regards,
Herivelto S. Bronzeado
Brasília, Brazil
http://www.linkedin.com/profile/view?id=46319837&a...