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voltage rise check due to renewable power (Pgen) increase in psse

asked 2021-04-01 03:28:09 -0500

anonymous user

Anonymous

Hello.

I am trying to verify power network's voltage rise from increasing renewable power such as wind, solar, etc in PSS/E. I am checking only sav file in PSS/E, since I don't need dynamic simulation with (reec+repc+regc).

It is apparent that voltage will rise when RE generation is increased. (Now this is one of the biggest problem in power network in my area.) But although I increase RE generation (Pgen) in PSS/E, it shows that voltage is decreased after power flow analysis.

The problem is that; when I increase Pgen of RE generator, it absorbs more reactive power from power network after P/F analysis. If I increase Pgen from RE Generator, it absorbs more and voltage is decreased more. This is not actual situation, and I doubt which part I should check.

It will be helpful if you give me a advice.

Thank you in advance.

http://staic simulation (image description)

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what wmod are you using? you can set limits on the reactive power, to keep it from being overly generous with reactive power, with appropriate wmod values

bikiran1991 gravatar imagebikiran1991 ( 2021-04-02 20:12:31 -0500 )edit

Thank you for your reply. I use; 1. +-Q limits based on WPF mode. 2. Power factor: 0.95 3. scheduled voltage: 1 anyway what i want to see in pss/e is that; bus voltage should rise when I increase active power from RE plant.

yun gravatar imageyun ( 2021-04-04 19:24:08 -0500 )edit

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answered 2021-04-04 11:45:41 -0500

Pasnos gravatar image

Whether transmission voltages will rise or decrease is a matter of the voltage control mode in which you set the RE plants. In case they operate predetermined power factor you should not allow reactive power changes at the renewable terminal buses.

If on the other hand you model the renewable plants as PV buses with specific reactive power limits, then voltage will be controlled by the plant, thereby reactive power will be injected or absorbed depending on the bus voltages of the neighbor area.

What I think you need to do is that you should set a specific power factor on each renewable plant. This will treat the particular bus not as a PV, but rather as a PQ and voltages will result from the load flow calculations..

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Thank you for your reply. please refer to the below.

yun gravatar imageyun ( 2021-04-04 19:13:10 -0500 )edit
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answered 2021-04-04 19:47:49 -0500

yun gravatar image

updated 2021-04-04 19:52:24 -0500

Thank you for your reply. In my understanding, voltage will rise due to reverse active power from renewable power plant (PV, WT, etc), not due to reactive power from RE. SO what I want to do is that; I want to see voltage rise when increasing Pgen from RE plant, regardless of reactive power from RE.

But in PSS/E, when I put more RE Pgen, it absorbs or supplies more reactive power, and when reactive power is consumed at RE plant, voltage is of course dropped, which is not matched with my expectation. In addition, when I set Pf=1, it does not generate or absorb any reactive power, but bus voltage is also dropped with increased Pgen. ( When I set Pf=1 and increase Pgen from RE, step-up TR consumes more reactive power and it absorbs those from power network) Anyway the following is my test condition for RE; 1. common condition: q Limits based on WPF 2. changing condition: PF(1 or 0.95), schedule voltage (1 or 1.04pu)

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Asked: 2021-04-01 03:28:09 -0500

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Last updated: Apr 04