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InterPSS Cloud Edition User Guide

Contents

  1. 1 Loadflow Anlysis
  2. 2 Contingency Analysis
  3. 3 ODM Transformation
  4. 4 Sample Case


InterPSS Cloud Edition is currently hosted at the Google Cloud using the Google App Engine. After uploading a file in one of the supported formats, you can do the following analysis:



If you want to save you case for future usage and access more advance InterPSS features, you need to login. Please contact support@interpss.org for a user account.

Loadflow Anlysis

There are currently 4 loadflow methods [NR, NR+, PQ, PQ+] available. NR stands for the Newton method, PQ for the Fast Decouple method. The + indicating addtion features, including the following:
  • None-divergence
  • Add a swing bus if necessaroy
  • Turn-off all buses in an island if there is no generation source.
Loss allocation algorithm description could be found Here.

Contingency Analysis

InterPSS currently supports three types of contingency analysis: N-1 Analysis; N-1-1 Analysis and N-2 Analysis.
  • N-1 Analysis
Open each branch in the power network and run complete AC loadflow analysis for each contingency.
  • N-1-1 Analysis
First open each branch in the power network and run complete AC loadflow analysis for each contingency. Then for each N-1 contingency, open each branch with branch Mva rating violation and run complete AC loadflow analysis for each N-1-1 contingency.
  • N-2 Analysis
Open all combination of two branches in the power network and run complete AC loadflow analysis for each N-2 contingency.

The following three reports are generated after the analysis:
  • Non-converged Case
                   Non-converged loadflow case [ tolerance: 0.0010 pu ]

                 Case                                          Max Error Info
       ====================================================================================================
            [x]Bus120->Bus200(1)   dPmax :   0.00967(pu) at Bus : Bus141,     dQmax :   0.01829(pu) at Bus : Bus265
            [x]Bus1010->Bus1(1)    dPmax :  11.86389(pu) at Bus : Bus1010,    dQmax :   4.40034(pu) at Bus : Bus1020

The non-converged case report listed all cases with non-converged loadflow against the tolerance. InterPSS use a non-diverge loadflow algorithm, which guarantees that the loadflow will never diverge.
  • Voltage Margin
                    Bus Voltage Limit: [1.10, 0.85]

         Bus Id       LowVolt LowMargin           Description
       ===============================================================
           Bus340      0.8774     2.7%          [x]Bus110->Bus280(1)
           Bus141      0.7850    -6.5%          [x]Bus110->Bus280(1)
           Bus140      0.8437    -0.6%          [x]Bus110->Bus280(1)

The voltage margin report lists the lowest voltage for the bus for all contingencies and compare it with a Bus Low Voltage Limit. The description tells which contingency caused the lowest voltage. For example, [x]Bus110->Bus280(1) indicates that the open branchBus110->Bus280(1) contingency caused the lowest voltage.
  • Branch Mva Margin
          Branch Id        MvaFlow   MvaRating        P + jQ        Margin        Description
  ==============================================================+=================================
       Bus260->Bus263(1)      56.2      65.0    (   53.4+j   17.4)    14%      [x]Bus110->Bus280(1)
       Bus151->Bus150(1)     369.0     300.0    (  362.0+j   71.4)   -23%      [x]Bus111->Bus110(1)
       Bus111->Bus110(1)     378.3     150.0    (  368.0+j   87.9)  -152%      [x]Bus151->Bus150(1)
The branch Mva margin report lists the most severe branch Mva rating violation, indicating with a - sign. The description tells which contingency caused the most severe branch rating violation.

ODM Transformation

Download ODM Xml file.

Sample Case