Transcript Slide 1
Field Trial of Power Electronics LV Power Regulator in a Utility System April 20, 2015 B. A. (Brian) McMillan, P. Eng. Vice-President – Distribution Electrical Systems Greater Sudbury Hydro Mr. Robert McFetridge Director of technical Sales Gridco Systems Who is Greater Sudbury Hydro and Why is the Grid Modernization Important to Us Who Is GSHI Municipally owned Local Distribution Company (LDC) 47,500 Customers. No Generation, No Transmission Why Is the Smart Grid Important to Us? Winter peak 200 MW …. Summer peak 175 MW Existing 11 MW of combined heat and power generation 1.6 MW of landfill gas generation Applications Renewable Energy Standard Offer Program - 120 MW of wind and 20 MW solar Feed in Tariff – 35.8 MW of solar farms and 2 MW of small rooftops. Total applications and builds to date 190.4 MW Typical load on a sunny, windy May Saturday afternoon – 80 to 90 MW. The potential exists for more than 100% renewable generation penetration. Constraints - Boundary Conditions Used with permission of EPRI – thanks to Jeff Smith Constraints - Boundary Conditions Used with permission of EPRI – thanks to Jeff Smith Constraints – How Will The Primary Problems Appear? Used with permission of EPRI – thanks to Jeff Smith Constraints – How Will The Secondary Problems Appear? Used with permission of EPRI – thanks to Jeff Smith Increasing PV Penetration and the “Missing Regulation Zone” Managing Voltage – What’s in the Distribution Engineers Toolbox? MV Capacitor, Voltage Regulator Manage Z - Conductor size... Manage Z - Conductor length... Reduce I - Load splitting by three phasing... MITIGATION -- Secondary Voltage Control MITIGATION – Power Factor Control and Harmonics Control Power Factor -- Two Control Modes Set the desired load side power factor… Set up to 5 Kvars of capacitive or inductive reactive power Harmonics Control -- Two Control Actions Enable Load Side Voltage Harmonic control or… Enable Source Side Current Harmonic control or.. Both MITIGATION – Balancing Available IPR Resources Limited Power Allocation is Required When Enabling Functions Voltage Control Power Factor Correction Harmonics Control Demonstration Project -- Feeder Selection and Deployment Description Site selected with high PV penetration and readily accessible OH pole location. Customers seeing 252 volts before deployment. NR_Canada participation! LV Power Regulator install at Greater Sudbury Hydro Inc. Simple installation using standard techniques OH LV Power Regulator (Close-up) SCADA Integration XFMR Side IPR-50 Load Side GSH IPR-50 Voltage Regulation Performance. 24 Hours After Installation, 30s Snapshots of RMS Values Unit installed and powered up in BYPASS mode Unit switched into ACTIVE mode with 240V load voltage set point Load Voltage being precisely regulated to 240V set point during both forward and reverse power flow Load Voltage set point changed to 235V and then back to 240V Unit toggled into BYPASS, ACTIVE and back to BYPASS mode Unit left in BYPASS mode Source/Load voltage at +5% of nominal Source voltage above +5% of nominal Intermittent Reverse power flow (~ 15 kW) Reverse power flow (~ 20 kW) Issues? – It’s a Demo! When is less than 50 kVA not less than 50 kVA? Voltage Regulation near zero load crossing. Harmonics “problem”, high THD, at low loads. Summary The IPR is delivering stable voltage regulation for both forward and reverse power flow Successful SCADA integration is providing new visibility and control at Grid Edge PF regulation provides VAR support local to loads This new technology provides a new tool for GSH Distribution Engineering to achieve key Smart Grid objectives Thank you for Your Kind Attention! Mr. Robert McFetridge Director of Technical Sales Gridco Systems Cell: 919-901-9940 E-mail: [email protected] Brian McMillan, P. Eng., Vice-President Distribution Electrical Systems Greater Sudbury Hydro Inc. Cell: 705-688-6286 E-mail: [email protected]