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Java port of PYPOWER

Home Page: http://rwl.github.com/PYPOWER

License: Apache License 2.0

Java 99.68% Python 0.32%

jpower's Introduction

JPOWER

A Java port of MATPOWER - a software package for solving electrical power flow and optimal power flow problems.

Copyright and License

Licensed under the Apache License, Version 2.0 (the "License") you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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jpower's Issues

why there no parallelcolt 0.9.5 exist in github?

Transformer losses are not considered

Hi,

in jpower are transformer losses due to iron core losses not considered.
In effect, if you set up the branch matrix (jpc.branch) you must set in column 5 br_b (matpower manual page 112).
This value needs to be a complex number. When it's complex the calculation core (in matpower) is able to estimate losses (it's not perfect, but better than nothing).

Is it possible to change this matrix to a complex one and use these values?

if any tutorial or example program can be presented ? And where can i find it?

Djp_printpf throws NullpointerException

Machine: Core i7 Windows 7 64bit

java -version
java version "1.8.0_51"
Java(TM) SE Runtime Environment (build 1.8.0_51-b16)
Java HotSpot(TM) 64-Bit Server VM (build 25.51-b03, mixed mode)

Running, Djp_t_pf.java and setting "OUT_ALL" to "1.0"

Produces:

1..25

JPOWER Version 0.3.2, 21-May-2012 -- AC Power Flow (Newton)

Newton's method power flow converged in 4 iterations.
Exception in thread "main" java.lang.NullPointerException
at edu.cornell.pserc.jpower.Djp_printpf.printpf(Djp_printpf.java:322)
at edu.cornell.pserc.jpower.pf.Djp_runpf.runpf(Djp_runpf.java:370)
at edu.cornell.pserc.jpower.pf.Djp_runpf.runpf(Djp_runpf.java:409)
at edu.cornell.pserc.jpower.pf.Djp_runpf.runpf(Djp_runpf.java:405)
at edu.cornell.pserc.jpower.test.Djp_t_pf.t_pf(Djp_t_pf.java:86)
at edu.cornell.pserc.jpower.test.Djp_t_pf.main(Djp_t_pf.java:185)

Calculation Problems

Hi,

at the moment I'm comparing results from JPower to MatPower, and for reference I'm using the:
9-Bus-Grid
It's delivered with MatPower and JPower.

Example differences

First of all these two grids differ in their matrixes, some values were different (I didn't kept track) and I changed them. Next step is now comparing the results (see below).

Problems so far:

As you can see, the maximum Q Losses line, is the wrong one
The Branch Data has a sign error in the Q Losses table (on every value!)
The Bus Data is completly messed up.

This all may result from the sign error in the Branch Data table...

JPower

================================================================================
|     System Summary                                                           |
================================================================================

How many?                How much?              P (MW)            Q (MVAr)
---------------------    -------------------  -------------  -----------------
Buses              9     Total Gen Capacity     820,0        -900,0 to 900,0
Generators         3     On-line Capacity       820,0        -900,0 to 900,0
Committed Gens     3     Generation (actual)    320,0              34,9
Loads              3     Load                   315,0             115,0
  Fixed            3       Fixed                315,0             115,0
  Dispatchable     0       Dispatchable          -0,0 of -0,0      -0,0
Shunts             0     Shunt (inj)             -0,0               0,0
Branches           9     Losses (I^2 * Z)         4,95            -51,31
Transformers       0     Branch Charging (inj)     -              131,4
Inter-ties         9     Total Inter-tie Flow   565,0             170,0
Areas              1

                          Minimum                      Maximum
                 -------------------------  --------------------------------
Voltage Magnitude   0,958 p.u. @ bus 9          1,003 p.u. @ bus 6   
Voltage Angle      -4,35 deg   @ bus 9          9,67 deg   @ bus 2   
P Losses (I^2*R)             -                  2,46 MW    @ line 8-9
Q Losses (I^2*X)             -                 -0,81 MVAr  @ line 6-7

================================================================================
|     Bus Data                                                                 |
================================================================================
 Bus      Voltage          Generation             Load        
  #   Mag(pu) Ang(deg)   P (MW)   Q (MVAr)   P (MW)   Q (MVAr)
----- ------- --------  --------  --------  --------  --------
    1  1,000    0,000       -         -     -215,86*   -72,21*
    2  1,000    9,669       -         -     -215,86*   -72,21*
    3  1,000    4,771       -         -     -215,86*   -72,21*
    4  0,987   -2,407       -         -     -215,86*   -72,21*
    5  0,975   -4,017       -         -     -125,86*   -42,21*
    6  1,003    1,926       -         -     -215,86*   -72,21*
    7  0,986    0,622       -         -     -115,86*   -37,21*
    8  0,996    3,799       -         -     -215,86*   -72,21*
    9  0,958   -4,350       -         -      -90,86*   -22,21*
                        --------  --------  --------  --------
               Total:    319,95     34,88    315,00    115,00

================================================================================
|     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)
-----  -----  -----  --------  --------  --------  --------  --------  --------
   0      1      4     71,95     24,07    -71,95    -20,75     0,000     -3,32
   1      4      5     30,73     -0,59    -30,55    -13,69     0,174     -0,94
   2      5      6    -59,45    -16,31     60,89    -12,43     1,449     -6,31
   3      3      6     85,00     -3,65    -85,00      7,89     0,000     -4,24
   4      6      7     24,11      4,54    -24,01    -24,40     0,095     -0,81
   5      7      8    -75,99    -10,60     76,50      0,26     0,506     -4,29
   6      8      2   -163,00      2,28    163,00     14,46     0,000    -16,74
   7      8      9     86,50     -2,53    -84,04    -14,28     2,465    -12,40
   8      9      4    -40,96    -35,72     41,23     21,34     0,266     -2,26
                                                             --------  --------
                                                    Total:     4,955    -51,31

MatPower

================================================================================
|     System Summary                                                           |
================================================================================

How many?                How much?              P (MW)            Q (MVAr)
---------------------    -------------------  -------------  -----------------
Buses              9     Total Gen Capacity     820.0        -900.0 to 900.0
Generators         3     On-line Capacity       820.0        -900.0 to 900.0
Committed Gens     3     Generation (actual)    320.0              34.9
Loads              3     Load                   315.0             115.0
  Fixed            3       Fixed                315.0             115.0
  Dispatchable     0       Dispatchable          -0.0 of -0.0      -0.0
Shunts             0     Shunt (inj)             -0.0               0.0
Branches           9     Losses (I^2 * Z)         4.95             51.31
Transformers       0     Branch Charging (inj)     -              131.4
Inter-ties         0     Total Inter-tie Flow     0.0               0.0
Areas              1

                          Minimum                      Maximum
                 -------------------------  --------------------------------
Voltage Magnitude   0.958 p.u. @ bus 9          1.003 p.u. @ bus 6   
Voltage Angle      -4.35 deg   @ bus 9          9.67 deg   @ bus 2   
P Losses (I^2*R)             -                  2.46 MW    @ line 8-9
Q Losses (I^2*X)             -                 16.74 MVAr  @ line 8-2

================================================================================
|     Bus Data                                                                 |
================================================================================
 Bus      Voltage          Generation             Load        
  #   Mag(pu) Ang(deg)   P (MW)   Q (MVAr)   P (MW)   Q (MVAr)
----- ------- --------  --------  --------  --------  --------
    1  1.000    0.000*    71.95     24.07       -         -   
    2  1.000    9.669    163.00     14.46       -         -   
    3  1.000    4.771     85.00     -3.65       -         -   
    4  0.987   -2.407       -         -         -         -   
    5  0.975   -4.017       -         -       90.00     30.00 
    6  1.003    1.926       -         -         -         -   
    7  0.986    0.622       -         -      100.00     35.00 
    8  0.996    3.799       -         -         -         -   
    9  0.958   -4.350       -         -      125.00     50.00 
                        --------  --------  --------  --------
               Total:    319.95     34.88    315.00    115.00

================================================================================
|     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      4     71.95     24.07    -71.95    -20.75     0.000      3.32
   2      4      5     30.73     -0.59    -30.55    -13.69     0.174      0.94
   3      5      6    -59.45    -16.31     60.89    -12.43     1.449      6.31
   4      3      6     85.00     -3.65    -85.00      7.89     0.000      4.24
   5      6      7     24.11      4.54    -24.01    -24.40     0.095      0.81
   6      7      8    -75.99    -10.60     76.50      0.26     0.506      4.29
   7      8      2   -163.00      2.28    163.00     14.46     0.000     16.74
   8      8      9     86.50     -2.53    -84.04    -14.28     2.465     12.40
   9      9      4    -40.96    -35.72     41.23     21.34     0.266      2.26
                                                             --------  --------
                                                    Total:     4.955     51.31

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