TPL Dynamic Load Modeling

Transcription

1 TPL Dynamic Load Modeling PJM Planning Committee Mark Sims, Manager Transmission Planning 5/7/2015 1

2 TPL R2.4.1 Why dynamic load model? PJM recommendation Dynamic load model structures CLOD, CMLD (PSS/E) Dynamic load model requirements Potential stability issues due to dynamic load model TO load model survey results PJM dynamic load modeling schedule Contents 2

3 TPL R2.4.1: Dynamic Load Modeling Requirement System peak Load levels shall include a Load model which represents the expected dynamic behavior of Loads that could impact the study area, considering the behavior of induction motor Loads. An aggregate System Load model which represents the overall dynamic behavior of the Load is acceptable. Enforceable January 1,

4 Why dynamic load models? TPL Requirement Uncertainty in load model is relatively big compared to other power system components. Need to improve accuracy of load models. Current static load model may not be able to capture critical dynamic load behaviors to system stability Fault induced delayed voltage recovery (FIDVR): Southern Cal., Texas and the Southeast examples Changes in load characteristics: more energy efficient loads (VFDs, CFLs, heat pumps) 4

5 PJM Recommendation PSS/E CLOD model as a minimum requirement Recognized as a good starting point for dynamic load model development Several TOs are already using this type of load model Robust from simulation perspective TOs can develop and submit more complex dynamic load models such as PSS/E CMLD model if necessary 5

6 PSS/E Load Model CLODxx Only require 8 parameters. No single-phase AC motor model. Fixed motor characteristics; no motor protection model. 6

7 PSS/E Load Model CMLDxxU1 Static Load Model equations: P = Po * (P1c * V P1e + P2c * V P2e + P3 ) * (1 + Pf * Df ) Q = Qo * (Q1c * V Q1e + Q2c * V Q2e + Q3 ) * (1 + Qf * Df ) Po = Pload ( 1. Fma Fmb Fmc - Fmd) Qo = Po * tan ( acos(pfs) ) P3 = 1. P1c P2c Q3 = 1. Q1c Q2c I, 'USRLOD', LID, 'CMLDxxU1', 12, IT, 0, 132, 27, 146, 48, CON(J) to CON(J+131) / 7

8 Dynamic Load Model Requirements Dynamic Load Modeling Data Requirements (see TPL R2.1.4): Submitted load model shall be under system peak load conditions Submitted load model shall represent dynamic behavior of loads Submitted load model shall consider dynamics of induction motor loads 8

9 Dynamic Load Model Requirements (cont.) Dynamic Load Modeling - PJM Acceptance Requirements: Submitted load model shall be a PSS/E standard model in PSS/E format Submitted load model shall cover all load buses in TO s area Submitted load model shall be usable: Model shall initialize without error Model shall results in negligible transients for a no-disturbance Model shall results in stable behavior for an stable disturbance 9

10 Potential Stability Issues due to Dynamic Load Models For potential stability issues identified during the study, TOs and PJM will resolve the issues through the following steps: Investigate whether or not the potential issue is due to dynamic load models. If the cause of the issue is dynamic load model, PJM and TOs will develop validation process for the dynamic load model. The validation process may include but not limited to refining model parameters and/or structures, validation using measurement data. Based on the validation results, PJM and TOs may develop resolution plans. 10

11 PJM Dynamic Load Modeling Schedule Task 1: PJM distributes TO survey VIA for Dynamic Load Model (January 2015) Task 2: Review existing available literature (e.g. NERC, IEEE, WECC, other RTOs) regarding dynamic load model structure and current practice of other entities in US. (January February 2015) Task 3: Coordinate with TOs to determine PJM dynamic load modeling practice; Collect necessary information for those models; and perform benchmarking simulations. (March 2015 September 2015) Task 4: Refine and finalize dynamic load model with each TO. (October 2015 December 2015) Task 5: Implement dynamic load model in base line stability study (peak load case). (December January 2016) 11

12 Questions or Feedback 12