Implementation of OPF for Voltage control recommendations in real time Refinements to Loss minimization (Ongoing) Conclusions

Transcription

1 REAL TIME IMPLEMENTATION OF OPF BASED VOLTAGE CONTROL TOOL IN BCHydro Advanced Voltage Control Workshop, EPRI, May 19-20, 2011, Pennsylvania,U.S.A. Veera Raju VINNAKOTA Djordje ATANACKOVIC - PRESENTATION OVERVIEW Implementation of OPF for Voltage control recommendations in real time Refinements to Loss minimization (Ongoing) Conclusions 1

2 BC ELECTRIC NETWORK OVERVIEW - BC ELECTRIC SYSTEM 18,000 circuit km of transmission lines ( 60 kv 500 kv) 20 Major Generating plants ( 12,000 MW capacity) 360 substations 10,000 MW of peak load Long transmission lines from Remote generating facilities to Load center Controls against Voltage Stability, Transient Stability are part of operations Voltage control is important 2

3 System Voltage Control Approach, Supporting tool OPF System Voltage Control UI driven by OPF Control Recommendations 3

4 OPF (Voltage Var Dispatch) in Real Time Sequence - Runs with SE (RTNET) solution as base case every 2 minutes Buses system of base case power flow - Typically examines 80 controls to satisfy 25 voltage constraints - Recommends controls to correct voltage violations / save MW losses - Controls : Shunt reactors / capacitors switching Sync condensers, SVCs MVARs Generating Unit MVARs - Takes 2-4 seconds to complete the run 4

5 SAMPLE RESULTS Voltage Correction example PI Plot of MW losses Loss Minimization Example PI Plot of MW losses 5

6 IMPLEMENTATION ACTIVITIES Requirements Prototyping to cover one Region of controls Modeling, tracking the solution UI Development, Refinements Enhancement to cover full system Validation by Control room Real Time validation Operating order Training Handover to Control Room Ongoing Support 6

7 Control Room involvement,test/maintenance Facilities, Vendor Support Control room supervisor involvement from prototyping unto handing over to control room Dispatchers feedback during validation phase Study environment with direct access to real time data and SE solution Study environment modified to copy snap shot of SE solution and to run at chosen cycle A layer on UI for Analysts to try enhancements and also for quick trouble shooting Vendor support with direct access to developer 7

8 UI, Validation of results, Tracking the results, Outcome UI, Validation, Tracking the results Selection of Controls, Voltage constraints A Study display for evaluating effectiveness of a control A high level box for validity results ( Green >Good, Red > Reject) Quality tracking and improvements of SE solution Validation of tool running in real time over 2 years Every cycle of OPF Recommendations, etc., tracked Outcome Recommendations match close to expectations Potential savings : MWh a day ( Average 3-5 MW out of MW transmission losses) Operating order developed for using OPF for system voltage control Tool formally taken into service in February

9 HAND-OVER TO CONTROL ROOM Training and familiarization 1 st level of training on interpretation of VVD results to encourage looking at VVD results and to enable providing feedback by one-on-one discussions Introduction of the tool to dispatchers in the form of seminars, presented by Manager/supervisor involved in the project to train and / or to collect more feedback and to encourage using the tool Operating Order Distinguishing output produced by the tool as guideline recommendations to support dispatchers while following operating orders that are typically mandatory Ongoing Support 9

10 Issues Being Pursued VVD not to recommend tagged devices for control to be pursued Improve quality of state estimate in a few pockets of network mostly done VVD to provide priority of shunt recommendation in switching out a device over switching in any device modeled in VVD with in the Station to be pursued VVD to honor some unique control constraints such as : to keep at least 1 shunt reactor connected all the times in chosen stations to be pursued 10

11 CONCLUSIONS Implemented OPF for Voltage control recommendations in real time for Control room use Recommended controls match with control practices by dispatchers Newer control practice opportunities observed Quality of SE solution is critical Control Room involvement is corner stone for acceptance of tool Timely vendor support is important for successful implementation Refinements to Loss minimization are in progress 11

12 THANK YOU 12