Siemens Power Technologies International. DER Integration Planning Distribution Planning

Size: px
Start display at page:

Download "Siemens Power Technologies International. DER Integration Planning Distribution Planning"

Transcription

1 DER Integration Planning Distribution Planning

2 Solar Companies in U.S. Source: SEIA web, Page 2

3 Solar Installation in MWdc U.S. Market By 2014 more than 20,000 MW (20 GW) solar PV were installed. Solar PV Energy price: Utility Scale <> 8.0 C$/kWh Residential <> 11.5 C$/kWh Installation cost dropped down to less than 3 $/W from 8 $/W ten years ago. Source: SEIA web, Page 3

4 What Does More PV Mean for Customer and Utilities? MW Customer: Savings ($) Utility: Challenges Voltage regulation, power quality, protection coordination, reliability, reverse power flow, operation /safety, asset management. Energy and power purchasing needs. Reverse power flow Page 8

5 Operational Challenges / Questions Overview Distribution System Transmission System Page 9 Issue Voltage regulation Flows from distribution system Handling reverse power flows Maintaining frequency Over/under relative to schedule System stability Discussion DG may create high voltages at customer connection, potentially causing inverter to trip off. Traditional voltage regulation is disrupted with intermittent DG. Equipment life cycle perturbed S/S transformers LTC may be disrupted. May create miss coordination unless protective equipment are updated. DG penetration, may increase the system spinning reserve needs. Sudden DG changes may create difficulty in predicting system operation. Increase of DG may require increase of spinning reserve needs.

6 Distributed Generation Study Objectives 1. Identify Max amount of DG penetration without distribution system upgrades. 2. Understand: What limits more DG integration? Where are those limitations located? How complex are the limitations? 3. Find opportunities to increase DG penetration without system upgrades. 4. If DG penetration increases what system upgrades are required? How much investment does it need? 5. Identify positive or negative impacts on transmission system. 6. How DG integration impact level of energy and power purchasing from bulk generation? Page 10

7 Renewable Energy Integration to a Distribution System Case Study 22 MW Peak demand 2 HV/MV Substations 10 Distribution Feeders Optimal power supply mix was previously defined Wind 3 Wind 2 Wind 1 Solar PV along distribution feeders Distribution System with proposed renewable generation locations Page 11

8 Solar PV and Wind Integration goals. Aggressive DG integration scenarios Scenario Wind (%) Solar PV (%) Total Penetration (% of peak load) Baseline 0% 10% 10% Scenario 1 1% 16% 17% Scenario 2 9% 22% 31% Scenario 3 21% 28% 49% Scenario 4 31% 35% 66% Scenario 5 41% 39% 80% Generation portfolio includes 8.8 MW solar PV and 9 MW wind generation by the end of study horizon Page 12

9 System Analysis Voltage Heat Map Scenario 2 (30% DG) Assuming DG locations are fixed, The distribution system can accommodate 30% of peak demand (or 80% of min demand) without system upgrades. Page 13

10 System Analysis (continued) Voltage Heat Map Scenario 3 (50% DG) When wind generation generates above 2 MW the system started recording overvoltages. 5 MW Solar PV doesn t cause voltage issues. Page 14

11 System Analysis (Continued) Voltage heat Map Scenario 5 (80% DG) System can take around 8 MW Solar PV (130% of min demand) without system upgrades. Wind generation causes over voltages. Page 15

12 Mitigation Options Increase the schedule voltage at substation LTC for scenario 0, 1 and 2. Reduce the scheduled voltage at substation LTC from scenario 3 onwards. Install most of the wind capacity at Site 1 and less at Sites 2 and 3. Install wind in feeder 9 and 10. If wind plants can t be relocated, reduce installed capacity and increase Solar PV. Curtail or store (energy storage system) any excess wind that would cause a high voltage. Add smart power factor correction capabilities (i.e. dynamic VAR compensators). Build an express distribution feeder to interconnect Wind 2 and 3 Build a sub-transmission line to interconnect Wind 2 and 3. Page 16

13 Some Study Examples Past 2 Years Parker Ranch: Renewable Generation portfolio to Hawaiian IRP process. North Eastern Region Utility: Performing DG impact assessment. Eastern Utility: Performing DG penetration impact assessment. Phase 1: Quasi Steady State Analysis Phase 2: Dynamic simulation, power quality assessment Caribbean Utility: Gas Turbine + Renewable integration study to T&D and rate impact. ASPA: Renewable integration study, Quasi Steady State and Transient Stability Analysis. Solar Developer. Solar PV integration to a Utility system in the Pacific Cost. Developer. Net zero Community Microgrid Assessment. Atlantic Coast. Page 17

14 Thank you for your attention! Hugo Bashualdo Sr. Manager Distribution Planning & Microgrids Siemens PTI. Phone: +1 (518) Mobile: +1 (518) David Lovelady Sr. Manager Power Academy Siemens PTI. Phone: +1 (518) Mobile: +1 (518) State Street 123 Schenectady, NY Page 18