It is working as expected. The load will be curtailed when the price is higher
than the value you assign to the load. So if you assign a value of $38, and the
price is $40, it will be curtailed. If you assign the value to $45, the load
will not be curtailed at a price of $40. Essentially, you are saying … this
load should only be curtailed if the price goes above $45, so you would not
expect any curtailment at lower prices (like $40).
Ray
> On Mar 12, 2016, at 5:08 AM, Mounika Vanjarapu <mounikavanjar...@gmail.com>
> wrote:
>
> sir
> i am using price sensitive loads concept.i select the bus 4th as my
> dispatchable load.before converting the loads to dispatchable the LMP at the
> 4th bus is 40.19$/MWh.now i set the curtailble price at 38 as
> mpc=loadcase('case14m');
> >> mpc0=load2disp(mpc,'m',4,38);
> >> runopf(mpc0)
>
> MATPOWER Version 5.0b1, 01-Jul-2014 -- AC Optimal Power Flow
> MATLAB Interior Point Solver -- MIPS, Version 1.0.2, 01-Jul-2014
> Converged!
>
> Converged in 0.10 seconds
> Objective Function Value = 6190.15 $/hr
> ================================================================================
> | System Summary
> |
> ================================================================================
>
> How many? How much? P (MW) Q (MVAr)
> --------------------- ------------------- ------------- -----------------
> Buses 14 Total Gen Capacity 772.4 -52.0 to 148.0
> Generators 5 On-line Capacity 772.4 -52.0 to 148.0
> Committed Gens 5 Generation (actual) 220.2 71.2
> Loads 11 Load 211.2 77.4
> Fixed 10 Fixed 211.2 77.4
> Dispatchable 1 Dispatchable 0.0 of 47.8 -0.0
> Shunts 1 Shunt (inj) -0.0 20.7
> Branches 20 Losses (I^2 * Z) 8.97 38.85
> Transformers 3 Branch Charging (inj) - 24.3
> Inter-ties 0 Total Inter-tie Flow 0.0 0.0
> Areas 1
>
> Minimum Maximum
> ------------------------- --------------------------------
> Voltage Magnitude 1.011 p.u. @ bus 3 1.060 p.u. @ bus 1
> Voltage Angle -13.69 deg @ bus 14 0.00 deg @ bus 1
> P Losses (I^2*R) - 2.72 MW @ line 1-2
> Q Losses (I^2*X) - 8.30 MVAr @ line 1-2
> Lambda P 35.84 $/MWh @ bus 1 40.03 $/MWh @ bus 3
> Lambda Q -0.08 $/MWh @ bus 1 0.56 $/MWh @ bus 14
>
> ================================================================================
> | Bus Data
> |
> ================================================================================
> Bus Voltage Generation Load
> Lambda($/MVA-hr)
> # Mag(pu) Ang(deg) P (MW) Q (MVAr) P (MW) Q (MVAr) P Q
>
> ----- ------- -------- -------- -------- -------- -------- -------
> -------
> 1 1.060 0.000* 184.04 0.00 - - 35.838
> -0.084
> 2 1.041 -3.889 34.80 25.44 21.70 12.70 37.398 -
> 3 1.011 -10.790 1.33 28.24 94.20 19.00 40.026 -
> 4 1.018 -7.626 - - 0.00* -0.00*
> 38.762 0.161
> 5 1.019 -6.692 - - 7.60 1.60
> 38.380 0.220
> 6 1.060 -12.021 0.00 9.97 11.20 7.50 38.386
> -
> 7 1.048 -10.804 - - - -
> 38.787 0.133
> 8 1.060 -10.804 0.00 7.52 - -
> 38.787 -
> 9 1.045 -12.468 - - 29.50 16.60
> 38.802 0.202
> 10 1.040 -12.680 - - 9.00 5.80
> 38.950 0.308
> 11 1.046 -12.482 - - 3.50 1.80
> 38.795 0.225
> 12 1.045 -12.873 - - 6.10 1.60
> 39.007 0.207
> 13 1.040 -12.934 - - 13.50 5.80
> 39.200 0.343
> 14 1.024 -13.692 - - 14.90 5.00
> 39.800 0.559
> -------- -------- -------- --------
> Total: 220.17 71.16 211.20 77.40
>
> ================================================================================
> | Branch Data
> |
> ================================================================================
> Brnch From To From Bus Injection To Bus Injection Loss (I^2 * Z)
>
> # Bus Bus P (MW) Q (MVAr) P (MW) Q (MVAr) P (MW) Q
> (MVAr)
> ----- ----- ----- -------- -------- -------- -------- --------
> --------
> 1 1 2 125.50 -6.03 -122.78 8.50 2.718 8.30
> 2 1 5 58.54 6.03 -56.86 -4.39 1.685 6.96
> 3 2 3 64.90 1.90 -63.07 1.21 1.834 7.73
> 4 2 4 39.83 0.18 -38.98 -1.19 0.853 2.59
> 5 2 5 31.15 2.16 -30.63 -4.25 0.518 1.58
> 6 3 4 -29.80 8.03 30.43 -7.74 0.632 1.61
> 7 4 5 -37.01 9.82 37.19 -9.22 0.189 0.60
> 8 4 7 28.90 -2.65 -28.90 4.28 0.000 1.63
> 9 4 9 16.65 1.76 -16.65 -0.35 0.000 1.41
> 10 5 6 42.69 16.26 -42.69 -11.86 0.000 4.40
> 11 6 11 6.48 4.18 -6.43 -4.08 0.050 0.11
> 12 6 12 7.69 2.60 -7.62 -2.45 0.072 0.15
> 13 6 13 17.31 7.54 -17.10 -7.12 0.210 0.41
> 14 7 8 -0.00 -7.43 0.00 7.52 0.000 0.09
> 15 7 9 28.90 3.15 -28.90 -2.30 0.000 0.85
> 16 9 10 6.09 3.58 -6.08 -3.55 0.015 0.04
> 17 9 14 9.96 3.20 -9.83 -2.93 0.127 0.27
> 18 10 11 -2.92 -2.25 2.93 2.28 0.010 0.02
> 19 12 13 1.52 0.85 -1.51 -0.85 0.006 0.01
> 20 13 14 5.12 2.17 -5.07 -2.07 0.049 0.10
> --------
> --------
> Total: 8.968 38.85
>
> ================================================================================
> | Voltage Constraints
> |
> ================================================================================
> Bus # Vmin mu Vmin |V| Vmax Vmax mu
> ----- -------- ----- ----- ----- --------
> 1 - 0.940 1.060 1.060 518.860
> 6 - 0.940 1.060 1.060 72.456
> 8 - 0.940 1.060 1.060 79.294
>
> ================================================================================
> | Generation Constraints
> |
> ================================================================================
> Gen Bus Active Power Limits
> # # Pmin mu Pmin Pg Pmax Pmax mu
> ---- ----- ------- -------- -------- -------- -------
> 4 6 1.614 0.00 0.00 100.00 -
> 5 8 1.213 0.00 0.00 100.00 -
>
> Gen Bus Reactive Power Limits
> # # Qmin mu Qmin Qg Qmax Qmax mu
> --- --- ------- -------- -------- -------- -------
> 1 1 0.084 0.00 0.00 10.00 -
>
> ================================================================================
> | Dispatchable Load Constraints
> |
> ================================================================================
> Gen Bus Active Power Limits
> # # Pmin mu Pmin Pg Pmax Pmax mu
> --- --- ------- -------- -------- -------- -------
> 6 4 - -47.80 -0.00 0.00 0.351
>
> Gen Bus Reactive Power Limits
> # # Qmin mu Qmin Qg Qmax Qmax mu
> --- --- ------- -------- -------- -------- -------
> 6 4 4.868 0.00 0.00 3.90 -
>
>
>
>
> my doubt is when i set the price at 45 more than the price 40.19 which i get
> in normal power flow then the load is not curtailed.
> 1.the load should be curtailed for prices more than the marginal cost.but
> here the load is curtailed for less prices.why and what is the concept behind
> that.
