Small Generator Interconnection Facilities Study Report. Completed for Q0314 ( Interconnection Customer ) A Qualified Facility

Transcription

1 Small Generator Interconnection Completed for Q0314 ( Interconnection Customer ) A Qualified Facility Proposed Interconnection PacifiCorp s 34.5-kV West Cedar Substation December 29, 2010

2 TABLE OF CONTENTS 1.0 DESCRIPTION OF THE PROJECT SCOPE AND OBJECTIVE OF THE STUDY FACILITIES ANALYSIS ASSUMPTIONS POINT OF INTERCONNECTION SCOPE OF WORK INTERCONNECTION CUSTOMER S COLLECTOR SUBSTATION INTERCONNECTION DISTRIBUTION CIRCUIT POINT OF INTERCONNECTION SUBSTATION COMMUNICATION SPECIFICATIONS [PAST THE POINT OF INTERCONNECTION] COST ESTIMATE SCHEDULE PARTICIPATION BY AFFECTED SYSTEMS APPENDICES SGIQ0314 Page 2 December 29, 2010

3 1.0 DESCRIPTION OF THE PROJECT ( Interconnection Customer ) has proposed the interconnection of 20 MW of new solar generation to PacifiCorp s ( Distribution Provider ) 34.5-kV transmission system located in Iron County, Utah. The solar project will consist of twenty (40) 500 kw photovoltaic panels for a total output of 20 MW. The panels will grouped into to strings and will be bundled into groups of 4 panels per 480V to 34.5-kV step-up transformer. The requested commercial operation date has been moved to the fourth quarter of 2011, or by December 31, Interconnection Customer will operate this generator as a Qualified Facility as defined by the Public Utility Regulatory Policies Act of 1978 (PURPA). The Distribution Provider has assigned the project Q SCOPE AND OBJECTIVE OF THE STUDY The objective of the Facilities Study is to: Specify and estimate the cost of the equipment, engineering, procurement and construction work (including overheads) needed to implement the conclusions of the system impact study(s). Identify: (1) The electrical switching configuration of the equipment, including, without limitation, transformer, switchgear, meters, and other station equipment. (2) The nature and estimated cost of the Transmission Provider s Interconnection Facilities and Upgrades necessary to accomplish the interconnection. (3) An estimate of the time required to complete the construction and installation of such facilities. 3.0 FACILITIES ANALYSIS ASSUMPTIONS All active higher priority transmission service and/or generator interconnection requests will be considered in this study and are listed in Appendix 1. If any of these requests are withdrawn, the Transmission Provider reserves the right to restudy this request, as the results and conclusions contained within this study could significantly change. For study purposes there are two separate queues: o Transmission Service Queue: to the extent practical, all network upgrades that are required to accommodate active transmission service requests and are expected to be in-service on or after the Interconnection Customer s requested in-service date for the Project will be modeled in this study. o Generation Interconnection Queue: when relevant, interconnection facilities associated with higher queue interconnection requests will be modeled in this study. However, network upgrades required to provide delivery will only be modeled for projects which have requested network resource integration service only or qualified facility status. No generation will be simulated from any higher SGIQ0314 Page 3 December 29, 2010

4 queued project unless a commitment has been made to obtain transmission service. The Interconnection Customer s request for interconnection service in and of itself does not convey transmission service. This study assumes the Project will be integrated into Transmission Provider s system at the agreed upon and/or proposed point of interconnection. Generator tripping may be required for certain outages. All facilities will meet or exceed the minimum WECC, NERC, and Transmission Provider performance and design standards 4.0 POINT OF INTERCONNECTION The proposed generation facility is to be interconnected, through ten (10) 2000/2250 kva kv to 480-V step-up transformers. The customer has requested to interconnect to Distribution Provider s 34.5-kV Transmission system at West Cedar substation. Figure 1 below, contains a simplified oneline of the proposed generation facility. Figure 1: Simplified One line Diagram of System SGIQ0314 Page 4 December 29, 2010

5 5.0 SCOPE OF WORK 5.1 INTERCONNECTION CUSTOMER S COLLECTOR SUBSTATION The following outlines the design, procurement, installation, and ownership of equipment that is needed for the Interconnection Customer s Collector Substation. WORK TO BE COMPLETED BY THE INTERCONNECTION CUSTOMER Engineer, procure, and construct all facilities required for the Interconnection Customer s collector substation except for those facilities/components indicated as supplied by the Distribution Provider. The Interconnection Customer shall submit, on forms provided by the Distribution Provider, information specific to equipment designed, purchased, and installed by the Interconnection Customer that will be owned and maintained by the Distribution Provider. The completed forms are to be returned to the Distribution Provider s project manager or designated representative. Install a 34.5-kV circuit breaker at the collector substation for connection to the 34.5-kV, 1.1 mile long radial distribution line. The Distribution Provider will review the Interconnection Customers specifications for the breaker to ensure compatibility with the Distribution Providers control and protection schemes. Prior to back feed the Interconnection Customer must arrange distribution voltage retail meter service for electricity consumed by the project and arrange back up station service for power that will be drawn from the transmission or distribution line when the Project is not generating. The Interconnection Customer must call the PCCC Solution Center to arrange this service. Install a relay panel provided by the Distribution Provider in the collector substation. This panel will contain the Distribution Provider s owned and maintained line relays that will function with the line relays installed at the point of interconnection substation for high speed protection of the Interconnection Customer s 34.5kV radial distribution line. The detection and isolation of faults on the 34.5-kV collector system beyond the Interconnection Customer s collector substation 34.5-kV bus will be the responsibility of the Interconnection Customer. Faults on that system will need to be detected and cleared in ten cycles or less. Design, procure, and install, the fiber optic cable, splice boxes, and termination panels for the fiber optic link between the collector substation and the point of interconnection substation. The Distribution Provider will own and maintain the fiber optic system after commissioning. Design, procure, install, own, and maintain the battery backed up power source for the fiber optic communications system. Terminate all field Input/Output connections required to provide data and control in accordance with safe system operation and in compliance with the Interconnection Agreement. Terminate the fiber cable installed between the collector substation and the point of interconnection substation in fiber patch panels and perform continuity and final testing to ensure installation meets specifications and standards provided by the Distribution Provider. SGIQ0314 Page 5 December 29, 2010

6 Design, procure, install, own, and maintain a data concentrator and digital communication circuit using DNP-3.0 protocol. The data concentrator will bridge the data from the generation facility s control system to an existing fiber node at the West Cedar substation. This data will then be transmitted to the Distribution Provider s system control center over the existing fiber network. Design, procure, install, own, and maintain a remote combination Input/Output module and interface to the point of interconnection substation SCADA RTU. The following data is required to be provided to the point of interconnection substation from the Interconnection Customer s substation: Analogs: 52-1 Real Power 52-1 Reactive Power 52-2 Real Power 52-2 Reactive Power Auxiliary Real Power Auxiliary Reactive Power Status: 34.5-kV breakers WORK TO BE COMPLETED BY THE DISTRIBUTION PROVIDER Supply all specifications required for the Distribution Provider s equipment to facilitate design of the collector substation. Perform final checkout and testing/commissioning of the interconnecting line protection/control and communications systems in the collector substation. Design, procure, install, own and maintain a new fiber node and multiplexer to communicate with the existing fiber node in the Distribution Provider s Point of Interconnection substation. Design, procure, own, and maintain a relay panel that will be installed by the Interconnection Customer in the collector substation. This panel will function with the line relays installed at the point of interconnection substation for current differential line protection of the Interconnection Customer s radial transmission line. 5.2 INTERCONNECTION DISTRIBUTION CIRCUIT The following outlines the design, procurement, installation, testing and ownership of equipment for Distribution Provider s Distribution Circuit. WORK TO BE COMPLETED BY THE INTERCONNECTION CUSTOMER Engineer, procure, construct, own and maintain the 1.1-mile 34.5-kV interconnecting tie line between the point of interconnection substation and the Interconnection Customer s collector substation. The last transmission line structure located adjacent to the Distribution Provider s point of interconnection SGIQ0314 Page 6 December 29, 2010

7 substation shall be constructed to Distribution Provider s standards and be one of the following structures; TG 242, TG 251, or TG 252. Engineer, procure, and construct all OPGW/ADSS fiber optic cable (48 count, single mode) and associated equipment from the collector substation to the termination panel inside the point of interconnection substation to support usage of a current line differential relay system that will be used to detect faults the radial interconnection line as well as other relay and operational data communications. WORK TO BE COMPLETED BY THE DISTRIBUTION PROVIDER Supply specifications for Distribution Provider equipment to facilitate the design of the Interconnection Customer s take-off structure. Review the Interconnection Customer s take off structure adjacent to the Distribution Provider s point of interconnection substation to ensure proper clearance and tension. Supply specifications to the Interconnection Customer for the installation of the Distribution Provider s fiber optic cable. Own and maintain all OPGW and ADSS fiber optic cable after final acceptance and checkout by the Distribution Provider. 5.3 POINT OF INTERCONNECTION SUBSTATION The following scope outlines the design, procurement, installation, and ownership of equipment that is needed for the interconnection of the proposed generation facility. In the existing line position, designated as the future capacitor bank position, installation of the additional switches, circuit breaker, bus work and all other equipment/material required will be needed to allow for the interconnection of the Interconnection Customer s generation facility into the West Cedar substation. WORK TO BE COMPLETED BY THE INTERCONNECTION CUSTOMER Design, procure, install, own, and maintain one (1) - 3 conduit with 2 interducts from the Interconnection Customer s last radial transmission line structure located adjacent to the point of interconnection substation to the fence line of the point of interconnection substation. This conduit will join with Distribution Provider installed conduits from the fence to the fiber termination panel inside the point of interconnection substation. Furnish and install the Distribution Provider s ADSS fiber into the point of interconnection control house and terminate the fiber optic cable in the fiber termination patch panels. The fiber patch panels will be owned and maintained by the Distribution Provider; and the Distribution Provider will make the final connection between the patch panel and the end use equipment. Perform end to end checkout of the installed fiber optic cable circuitry between the patch panels at the Interconnection Customer collector substation and the point of interconnection substation and provide optical time-domain reflectometer test traces to the Distribution Provider. Final checkout and SGIQ0314 Page 7 December 29, 2010

8 acceptance shall be in accordance with the Distribution Providers standards and specifications. WORK TO BE COMPLETED BY THE DISTRIBUTION PROVIDER Engineer, procure, construct, own and maintain a new 34.5kV line position to allow for the connection of the Q0314 project into the West Cedar substation. The following is a list of the major equipment required: One (1) 72.5-kV, 2000A, breaker Two (2) 34.5-kV, 2000A, TPST, double side break, manually operated switches One (1) 34.5-kV, 2000A, TPST, vertical break manually operated switch Three (3) 30-kV, MCOV surge arresters Three (3) 34.5-kV metering units Design, procure, install, own and maintain protective relays to detect faults on the 34.5-kV system. A current differential line protection system will be used for this line. The line relays will communicate over the fiber optic communications system installed on the Interconnection Distribution Circuit. In addition to the line protective relaying, a relay used for under/over voltage and over/under frequency protection of the system will be installed at West Cedar substation. If the voltage, magnitude or frequency, is outside of the normal operation range this relay will trip open the tie breaker at West Cedar substation. Design, procure, install own and maintain the point of interconnection revenue metering system including instrument transformers, meter panels, junction boxes, secondary meter control cable, and all other metering equipment to complete the system. The metering design package will include two revenue quality meters, test switches, and all digital and analog data terminated at a metering interposition block. One meter will be designated a primary meter and be used for SCADA data that includes bidirectional KWh quantities, and instantaneous MW, MVAr and per phase voltage data. The second or backup meter will be used for MW data sent to the alternate control center. Because the instrument transformers are a long lead time item, the Interconnection Customer has the option to procure them to the Distribution Provider s specification if desired. Design, procure, modify, own and maintain the existing fiber node equipment in the West Cedar substation. Design, procure, install, own and maintain a GE D20 RTU and make all input/output connections from the patch panel to the end use equipment. The following data is required from the West Cedar substation: Analogs: Net Generation Real Power Net Generator Reactive Power Accumulator Pulses: Interchange metering kwh SGIQ0314 Page 8 December 29, 2010

9 Supply a dialup phone line for retail sales metering and generational accounting via the MV-90 translation system. This may be provided by utilizing the digital communications system. Perform final checkout and point to point testing/commissioning of the communications, metering, and protection and control systems for the interconnection of the proposed generation project. 5.4 COMMUNICATION SPECIFICATIONS [PAST THE POINT OF INTERCONNECTION] The following scope outlines the design, procurement, installation and ownership of equipment that is needed to support the required communications past the point of interconnection. WORK TO BE COMPLETED BY THE DISTRIBUTION PROVIDER Design, procure, install, own and maintain additional multiplex equipment at the Cedar City Service Center, Scipio Pass Communications site, and Salt Lake Control Center. 6.0 COST ESTIMATE The following estimate represents only scopes of work that will be performed by the Transmission Provider. Costs for any work being performed by the Interconnection Customer are not included. West Cedar Substation $ 1,405,000 Installation of a new line position. Transmission Line $ 26,000 Connection of the customer tap line to Transmission Provider s system. Customer Substation $ 374,000 Equipment required for protection and control and communications. Cedar City Service Center $ 46,000 Equipment required for communications. Scipio Pass Communications Site $ 63,000 Equipment required for communications. Salt Lake Control Center $ 27,000 Equipment required for communications. Total Project $ 1,941,000 Note: This estimate is as accurate as possibly given the level of detailed study that has been completed to date and approximates the costs incurred by Distribution Provider to SGIQ0314 Page 9 December 29, 2010

10 interconnecting this generator to Distribution Provider s electrical distribution system. The Interconnection Customer will be responsible for all actual costs, regardless of the estimated costs communicated to or approved by the Interconnection Customer. 7.0 SCHEDULE Please note that the schedule is driven by the date that the Small Generator Interconnect Agreement is signed. If the signed agreement is not received by that date there will be, at a minimum, a day for day slip in the entire schedule. Changes in this date affect the entire schedule. The requested commercial operation date has been moved to the fourth quarter of 2011, or by December 31, Please note that the following schedule does not support the requested in-service date of December 31, Initiating task Date Execute interconnection agreement & provide financial security 02/01/2011 Engineering & procurement commences 04/01/2011 Engineering design completed 09/30/2011 Field construction commences 12/01/2011 Generator step-up transformer receives back feed power 07/31/2012 Generation testing 08/01/2012 Commercial operation 09/10/ PARTICIPATION BY AFFECTED SYSTEMS No Affected Systems were identified in relation to this Interconnection Request. 9.0 APPENDICES Appendix 1: Higher Priority Requests SGIQ0314 Page 10 December 29, 2010

11 APPENDIX 1: HIGHER PRIORITY REQUESTS All active higher priority transmission service and/or generator interconnection requests will be considered in this study and are identified below. If any of these requests are withdrawn, the Distribution Provider reserves the right to restudy this request, as the results and conclusions contained within this study could significantly change. Transmission/Generation Interconnection Queue Requests considered: No higher priority transmission service and/or generator interconnection requests have been identified. SGIQ0314 Page 1 December 29, 2010