DER_A Benchmark Update

Transcription

1 DER_A Benchmark Update Deepak Ramasubramanian, EPRI Anish Gaikwad, EPRI Pouyan Pourbeik, PEACE NERC LMTF October 31 st 2017 Austin, TX

2 DISCLAIMER The DER_A model is still a beta model under test and development and is right now not fully developed for use in bulk power system studies. 2

3 Power flow comparison Software Bus 1 V (pu) Ang (deg) Pg (MW) Qg (MW) Pd (MW) Qd (MW) PSLF PSS E Software Bus 2 V (pu) Ang (deg) Pg (MW) Qg (MW) Pd (MW) Qd (MW) PSLF PSS E PowerWorld Used PSS E RAW file PowerWorld Used PSS E RAW file DSA Tools Used PSLF EPC file DSA Tools Used PSLF EPC file Software Bus V (pu) Ang (deg) Pg (MW) Qg (MW) Pd (MW) Qd (MW) PSLF PSS E Software Bus V (pu) Ang (deg) Pg (MW) Qg (MW) Pd (MW) Qd (MW) PSLF PSS E PowerWorld Used PSS E RAW file PowerWorld Used PSS E RAW file DSA Tools Used PSLF EPC file DSA Tools Used PSLF EPC file 3

4 Tests completed from test protocol Test number Description A Minimum value greater than vl1 B Minimum value less than vl1 for time lesser than tvl1 C Minimum value less than vl1 for time greater than tvl1 1 D Voltage play-in Minimum value less than vl0 for time lesser than tvl0 E Minimum value less than vl0 for time greater than tvl0 F Vl1=vl0 G Similar tests on the high side of the trip logic A Minimum value less than fl for time lesser than tfl 2 B Frequency play-in Minimum value less than fl for time greater than tfl C Similar tests on the high side of the trip logic 6 In frequency response mode, change in power output to change in observed frequency 4

5 Summary of observed inconsistencies Tests 1B 1E & 1Gii 1Gv Pseudo code output doesn t match in terms of transient values. Tests 1D and 1Giv Significant difference in ramp recovery of active power, and peak of reactive power Test 1E Post disturbance power output in PowerWorld recovers to pre-disturbance level while it goes to zero in other software. 5

6 Summary of observed inconsistencies (cont d) Test 2A PSS E: Frequency multiplier value goes to zero as soon as frequency goes below threshold. Timer is involved only in assessing whether multiplier value comes back to 1 or not. Spikes in measured bus frequency Tests 2B and 2Cii PowerWorld and TSAT spikes in measured bus frequency at time of trip. Tests 2B and 2Cii PSLF Step rise in bus voltage Tests 2Ci and 2Cii PSS E Possible numerical robustness issue General issue: PowerWorld Value of frequency trip threshold is required in Hz, but GUI dialog mentions per unit. 6

7 Summary of observed inconsistencies (cont d) Test 6i and 6ii 0.2 MW difference in final steady state power output for same bus observed frequency. Test 7A Significant difference in ramp recovery of active power and bus frequency PSLF PSS E PowerWorld TSAT 7

8 Test 1A Spikes in reactive power are for at most three integration time steps with each time step being s 8

9 Test 1B Voltage magnitude at the terminal of the model 9

10 Test 1B Voltage Multiplier 10

11 Test 1B Active Power 11

12 Test 1B Reactive Power 12

13 Test 2A Bus frequency at the terminal of model 13

14 Test 2A Frequency Multiplier 14

15 Test 2A Active Power 15

16 Test 7A Terminal Voltage 16

17 Test 7A Active Power 17

18 Test 7A Reactive Power 18

19 Test 7A Bus Frequency 19

20 Future steps Tests left to be performed 3 In voltage control mode, step change in Vref0 4 In constant Q mode, step change to Qref 5 In constant power factor mode, step change to Pref to observe output P and Q 7 A B C To test the voltage source interface, with Tg = 0.02s, apply a fault on Bus 2 and/or BusX21 Xe = 0.2pu on self MVA base Xe = 0.5pu on self MVA base Xe = 0.8pu on self MVA base 1. Continue Tests 1, 2 and 6 based on feedback from these first set of tests. PSS E and PowerWorld have provided updated DLLs which address most of the issues observed. Upon receiving updated DLLs for GE-PSLF and TSAT, these tests will be re-run. Timeline for completion January Start discussion on roadmap for second phase of testing to test numerical robustness of the model. 3. Detailed information on results of all tests were presented at the WECC REMTF meeting on October 4 th The presentation can be found at 20

21 Together Shaping the Future of Electricity 21