# Re: Setting ramp constrains in unit commitment problem in MOST.

```Hi Ray,
Thank you very much for quick reply.
I'm working on the unit commitment example presented in the MOST manual
(Example 6). This is the code i'm using:```
```

-
- casefile = 'ex_case3b';
- [iwind, mpc, xgd] = addwind('ex_wind_uc', mpc, xgd);
- profiles = getprofiles('ex_wind_profile_d', iwind);
- nt = size(profiles(1).values, 1);       % number of periods
- mpc_full = mpc;
- xgd_full = xgd;
- mpc.gen(1,RAMP_30)=10;
- mpc.gen(1,RAMP_30)=10;
- mpc.gen(1,RAMP_10)=10;
- mpc.gen(1,RAMP_10)=10;
- xgd.InitialPg(1)=100;
- mdi = loadmd(mpc, nt, xgd, [], [], profiles);
- mdo = most(mdi, mpopt);
- if verbose
-     ms = most_summary(mdo);
- end

I would expect the generation dispatch of the first unit at the first
period to be restricted to 110MW. However,  the results show that the
generation dispatch of the first unit at the first period is 200MW.

==========     PG     ==========
Gen    t = 1    t = 2    t = 3    t = 4    t = 5    t = 6    t = 7    t =
8    t = 9    t =10    t =11    t =12
----  -------  -------  -------  -------  -------  -------  -------
-------  -------  -------  -------  -------
1   200.00   190.00   180.00   190.00   184.00   174.00   164.00
154.00   144.00   154.00   144.00   154.00
2      -        -        -        -        -      96.00   126.00
65.00      -        -      65.00   116.00
3   160.00   225.00   300.00   253.00   216.00   110.00    60.00
60.00    60.00    61.00    60.00    60.00
4  -440.00  -480.00  -540.00  -525.00  -500.00  -450.00  -400.00
-350.00  -300.00  -325.00  -375.00  -425.00
5    80.00    65.00    60.00    82.00   100.00    70.00    50.00
71.00    96.00   110.00   106.00    95.00

I don´t really understand the problem. What can I do?

Thank you very much,
Tatiana

2016-10-14 7:47 GMT-05:00 Ray Zimmerman <r...@cornell.edu>:

> Hi Tatiana,
>
> Your understanding seems to be correct, so it’s difficult for me to know
> what’s going on. Could you send me (off list) the input files and a minimal
> script needed to reproduce the problem so I can look into it?
>
> Thanks,
>
>     Ray
>
>
> On Oct 13, 2016, at 10:39 AM, Tatiana Carolina Cantillo Garcia <
> tcanti...@uninorte.edu.co> wrote:
>
> Dear all,
>
> I have a question about setting ramp constrains in the multiperiod problem
> in MOST.
> I have noticed that the ramp constrains (which are defined in the RAMP_30
> columns of the gen and the xgd matrix)  are violated in the period t=0 to
> t=1.
> For example, I have fixed the ramping limits of the first unit of my
> optimization problem to 10MW  ( mpc.gen(1,RAMP_30)=10, xgd.
> PositiveLoadFollowReserveQuantity(1)=10), and the active power dispatch
> at time t=0 (previous to optimization) is set to 100MW (
> xgd.InitialPg(1)=100). Thus, I would expect, the generation dispatch of the
> first unit at the first period to be restricted to 110MW. However when I
> run the multiperiod problem, the results show that the generation dispatch
> of the first unit at the first period is 200MW.
>
> How can I correct this?
>
> Thank you very much,
> Tatiana Cantillo
>
>
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