N-1CI C0083591 – IR746 Petpeswick Community Solar - $0 - Redacted
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Why do this project now? NS Power has received direction from the Government of Nova Scotia to proceed with the interconnection based on the Power Purchase Agreement (PPA) with the Interconnection Customer. This timing aligns with the expe...
AI summary NS Power is proceeding with interconnection under a Power Purchase Agreement (PPA) with the Interconnection Customer, as directed by the Government of Nova Scotia, timed to align with the solar garden facility's expected operation date.
Why do this project this way? The Minister has issued a Power Purchase Agreement for this project, in accordance with s. 11(5) of the Electricity Act. The project will be completed as per standard working procedures including the required...
AI summary The Minister has issued a Power Purchase Agreement (PPA) under the Electricity Act, requiring the project to follow standard procedures including work orders, permits, and compliance with the Distribution Generation Interconnection Procedure (DGIP) rules.
SUMMARY This study was initiated to determine the requirements and conditions for the proposed interconnection of 2.2 MW of solar generation with inverters by the Interconnection Customer (IC) at the West Petpeswick Road, Musquodoboit Harb...
AI summary This report outlines the interconnection requirements for a 2.2 MW solar farm in Musquodoboit Harbour, Nova Scotia. Alternative C was selected after evaluation, requiring a gang-operated switch and NSPI to upgrade distribution facilities at the Interconnection Customer's expense. Key responsibilities include the IC covering line extensions, right-of-way acquisition, and maintenance costs.
REDACTED CI C0083591 Attachment 1 Page 3 of 39 REDACTED (CONFIDENTIAL INFORMATION REMOVED) guy replacements, and customer owned equipment such as the gang-operated switch is not included in these estimates. - The cost estimate to complete...
AI summary The document outlines interconnection requirements for a solar project, including a $1,062,874 cost estimate, compliance with NSPI standards, flicker emission management, power factor specifications, and electrical safety protocols. NSPI retains operational control over high-voltage equipment and may disconnect the facility if flicker issues persist. The Interconnection Customer must adhere to electrical codes and obtain permits.
4.0 SUMMARY OF GENERATING FACILITIES REQUIREMENTS
AI summary This section provides an overview of requirements related to generating facilities, including interconnection procedures, cost considerations, and regulatory compliance for power generation projects in Nova Scotia.
4.1 Adverse System Impacts The Generating Facility must not adversely affect the Distribution System or service to any other connected customers or facilities.
AI summary The Generating Facility must not adversely affect the Distribution System or service to other connected customers or facilities, emphasizing the need to prevent negative impacts on grid reliability and customer service.
4.2 Isolating Devices A manual disconnecting device between the Generating Facility and its connection point behind the meter with a visible break for isolation purposes must be provided. The form of this device will vary with the service...
AI summary Section 4.2 mandates manual disconnecting devices between generating facilities and connection points, requiring accessibility to NSPI, visible breaks, gang-operation, and lockability. The device must comply with the Canadian Electrical Code and be approved by NSPI, with ownership by the Interconnection Customer.
4.3 Grounding Requirements Following the addition of any Interconnection Customer Interconnection Facilities and a Generating Facility to the Distribution System, the system must remain effectively grounded at all locations, in all sustain...
AI summary The section outlines grounding requirements for the distribution system after adding interconnection and generating facilities, emphasizing the necessity of effective grounding under all conditions to prevent overstressing surge arrestors. It references NSPI's DSIR for further details.
4.4 Interconnection Transformer Configuration The Generating Facility interconnection transformer shall not cause voltage disturbances or disrupt coordination of Distribution System ground fault protection. The interconnection transformer...
AI summary The interconnection transformer for the generating facility must not cause voltage disturbances or disrupt ground fault protection. The specified transformer is a 2500 kVA, 0.6kV–12.47kV Y-Yg padmount unit, as proposed by the Interconnection Customer.
4.5 Synchronizing Facilities Synchronous generators and self-commutated inverters connected to the Distribution System must be equipped with synchronizing facilities to permit connection only when both the frequency and voltage are within...
AI summary Section 4.5 outlines requirements for synchronizing facilities for synchronous generators and self-commutated inverters connected to the Distribution System. These facilities must ensure connection only when frequency and voltage are within specified limits, and settings must be approved by NSPI prior to finalizing the SSGIA. The Interconnection Customer is responsible for maintaining these facilities.
Aggregate Ratings of Generation (kVA) Frequency Difference (ΔHz) Voltage Difference (ΔV, %) Phase Angle Difference (degrees) 0 to 500 0.3 10 20 > 500 to 1,500 0.2 5 15 > 1,500 0.1 3 10 Table 3: Synchronization Limits - from IEEE 1547-2018...
AI summary Table 3 outlines synchronization limits for generation, including aggregate ratings, frequency differences, voltage differences, and phase angle differences, referencing IEEE 1547-2018 - Table 5.
All Generating Facilities must have protection employed which prevents any generator from being started, and synchronizing attempted, until the Distribution System feeder has voltages and frequencies that have Stabilized within normal rang...
AI summary Generator protection requirements specify that generators must not start or synchronize until the distribution system feeder has stabilized within normal voltage and frequency ranges for a settable delay period of 5-60 minutes, as determined by NSPI in Section 4.12.
4.6 Voltage Regulation and Power Factor Control Inverter-based generators interconnected to the distribution system must be capable of controlling voltage. The controller's voltage set-point shall be adjustable throughout the range of 95%...
AI summary Inverter-based generators interconnected to the distribution system must control voltage with adjustable set-points between 95% and 105% of rated terminal voltage. Refer to Section 6.17 of the DSIR document for additional requirements.
REDACTED (CONFIDENTIAL INFORMATION REMOVED) REDACTED CI C0083591 Attachment 1 Page 13 of 39 Frequency ride-through performance requirements for inverter-based generation, as shown in Table 5, must also be respected. The generator must stay...
AI summary The document outlines frequency ride-through performance requirements for inverter-based generation, referencing Table 5 from CSA C22.3. These requirements specify that generators must remain connected to the Distribution System during certain frequency-time ranges and operate in designated modes.
The Generating Facility shall have protective devices installed to detect abnormal voltages and to disconnect the generators from the system. Over/Under Voltage relaying limits (from CSA C22.3) will be set to meet the following unless othe...
AI summary The Generating Facility must install protective devices to detect abnormal voltages and disconnect generators from the system. Voltage relaying limits are set according to CSA C22.3 standards, unless otherwise specified by NSPI.
Table 6: Voltage Limit Default Settings – from Table 10, CSA C22.3 No. 9 Function Voltage (% of nominal voltage) Clearing Time (sec) OV3 >120 0.16 OV2 > 110 2 OV1 > 106 120 UV1 < 88 10 UV2 < 45 0.16 Voltage ride-through performance require...
AI summary The document provides voltage limit default settings and ride-through performance requirements for inverter-based generation, referencing CSA C22.3 No. 9 and IEEE 1547-2018. It outlines voltage thresholds and clearing times for overvoltage and undervoltage conditions, as well as operational requirements during these events.
4.9 Generator Islanding Islanding is not permitted. The Interconnection Customer must ensure that the Generating Facility cannot energize any portion of the NSPI Distribution System if the NSPI circuit source is de-energized. In addition,...
AI summary Islanding is prohibited, requiring the Interconnection Customer to ensure generators cannot energize the NSPI Distribution System if the NSPI circuit is de-energized. Anti-islanding protections must be enabled on the main intertie isolating device to prevent unauthorized energization.
4.10 Thermal Limits and Overcurrent Protection Thermal limits of NSPI equipment shall not be exceeded as a result of the addition of the generating facility. Protection shall be provided to detect and cease energization for all phase-to-ph...
AI summary NSPI equipment thermal limits must not be exceeded by new generating facilities. Overcurrent protection is required to detect and stop energization for phase-to-phase and phase-to-ground faults on the NSPI Distribution System.
4.11 Protection of Equipment and Fault Detection The Interconnection Customer must ensure that their protection devices will detect abnormal system conditions and isolate their facilities from the NSPI Distribution System including, but no...
AI summary The Interconnection Customer is required to ensure their protection devices detect abnormal system conditions such as over/under frequency, voltage, and anti-islanding, and isolate their facilities from the NSPI Distribution System to maintain reliability and safety.
4.12 Automatic Start/Restart of Generation Facilities Individual generators are permitted to automatically start or restart after tripping from the Distribution System. This automatic restart may occur only after the Distribution System vo...
AI summary Generators may automatically restart after tripping from the Distribution System only if voltages are restored, frequencies stabilize at 60 Hz, and a 5-minute delay has passed. This ensures system stability and safety following disruptions.
4.13 Protection Coordination The protection systems installed by the Interconnection Customer shall coordinate with NSPI's protection facilities. The Interconnection Customer shall submit details of the protection facilities and proposed s...
AI summary The Interconnection Customer must coordinate protection systems with NSPI's facilities, submitting details and proposed settings for review and acceptance. Revisions to settings also require NSPI approval, ensuring compatibility and reliability within the power grid.
4.14.1 Voltage Flicker The Interconnection Customer is to ensure that the operation of the Generating Facility does not cause voltage variations on the Distribution System that result in objectionable lamp flicker to other connected custom...
AI summary The Interconnection Customer must ensure their Generating Facility does not cause voltage variations leading to lamp flicker on NSPI's Distribution System. Voltage variations are measured at the POI, with IEEE 1547-2018 setting acceptable flicker limits (Pst95% ≤ 0.35, Plt95% ≤ 0.25) to prevent objectionable flicker.
4.14.2 Voltage Dips The acceptable limits for voltage deviation are listed in Table 8. Operation of the Generating Facility at full load output, from on-line to off-line shall cause no more than a 2.5% step change in system voltage measure...
AI summary The acceptable limits for voltage deviation are outlined, specifying that operating the Generating Facility at full load output should not cause more than a 2.5% step change in system voltage at the Point of Interconnection.
The harmonic current injection from the Generating Facility to the Distribution System measured at the POI shall not exceed the limits established by IEEE 519-2022. These limits are shown below in Table 9. Table 9: Maximum Harmonic Current...
AI summary The document specifies that harmonic current injection from a generating facility to the distribution system must not exceed limits set by IEEE 519-2022, as outlined in Table 9.
4.16 Voltage Regeneration Sustained voltage regeneration from the Interconnection Customer's Interconnection Facilities following the loss of a supply phase on the Distribution System is not permitted. Regenerated voltages may not be well...
AI summary The document prohibits sustained voltage regeneration after a supply phase loss on the Distribution System, citing risks of unregulated voltages and inadequate protection. Interconnection Customers must assess and mitigate voltage regeneration risks in their facility design. Generator transformers can regenerate voltage to varying degrees, requiring interconnection protection to detect phase loss.
4.17 Advanced Inverter Functions and Operating Requirements All advanced inverter-based Generating Facilities shall comply with the Advanced Inverter Functions and Operating Requirements specified in the Interconnection Requirements docume...
AI summary This section outlines the requirements for advanced inverter-based generating facilities, specifying that they must comply with CSA certification and functional standards outlined in CSA C22.3 No. 9.20.
The following is a summary of advanced inverter functions and their default state: • Anti-Islanding Activated • Voltage Ride Through Activated • Frequency Ride Through Activated • Volt-Watt Mode Available • Frequency-Watt Mode Available •...
AI summary The text outlines the default states of advanced inverter functions, including activated features such as anti-islanding, voltage and frequency ride through, and available modes like Volt-Watt and Dynamic Volt-VAr. It also references a section on interface control and communication requirements.
4.18.1 Interface Communications All inverter-based Generation Facilities shall have provisions for monitoring and control of the disconnecting device at the inverter or POI, as well as monitoring of real power output, reactive power output...
AI summary This section outlines requirements for inverter-based generation facilities, including monitoring and control provisions at the point of interconnection and compliance with CSA standards for information exchange.
5.0 LOCAL IMPACTS The following analysis was based on generator data provided by the customer. Distribution system software produced by Cyme International (CYMDIST 9.4) was used for the following sections to determine the impact of the new...
AI summary The analysis of local impacts uses customer-provided generator data and Cyme International's CYMDIST 9.4 distribution system software to assess the effect of new generation on the existing electrical system.
5.1 Configuration and Grounding NSPI's primary Distribution System is a 3-phase, 4-wire multi-grounded common neutral system ("effectively grounded-wye"). This generally provides a single intentional ground path for short-circuit currents...
AI summary NSPI's distribution system uses a 3-phase, 4-wire effectively grounded-wye configuration, ensuring a single ground path for short-circuit currents. Adding generating facilities requires maintaining effective grounding and compliance with DSIR Section 6.3 for short-circuit protection and device coordination.
Table 10: Short Circuit and X/R Ratio Data at Solar Generator Site POI Short Circuit Level and X/R Ratio at POI Feeder ID Generator Status Short Circuit Level (MVA) X0/R0 Ratio X1/R1 Ratio Connected 39 (LG) 53 (LLL) 3.18 2.33 Disconnected...
AI summary Table 10 presents short circuit and X/R ratio data at the Point of Interconnection (POI) for a solar generator site. Regardless of current short circuit levels, the Interconnection Customer must design facilities to withstand symmetrical fault levels of 9 kA (194 MVA), ensuring equipment is rated accordingly.
5.3 Equipment Thermal Limits The installation of 2.2 MW solar inverters will not create over-loading issues on the distribution facilities. The maximum steady state current produced by the generators is approximately 102 Amps at 12.47 kV w...
AI summary The installation of 2.2 MW solar inverters will not overload distribution facilities, as their maximum steady-state current (102A at 12.47 kV) is below the thermal limit of the #4/0 AASC conductor (400A).
5.4 Impact on Transmission System At maximum generation, IR#746 – Petpeswick Solar generator site injects 2.2 MW onto substation through a 12.47 kV distribution circuit. This does not exceed the minimum substation load for and is not expec...
AI summary The Petpeswick Solar project's 2.2 MW generation at maximum capacity is injected into a substation via a 12.47 kV distribution circuit. This does not exceed the substation's minimum load and is not expected to impact existing transmission infrastructure.
5.5 Voltage Flicker Emission Limits at POI Flicker data was not available for the proposed solar generator. The flicker value must adhere to the allowable flicker emission limits (Pst 95% ≤ 0.35) as per DSIR Section 6.14.1.
AI summary The proposed solar generator lacks available flicker data, requiring compliance with DSIR Section 6.14.1's Pst 95% ≤ 0.35 flicker emission limit at the Point of Interconnection (POI).
5.6 Voltage Unbalance The voltage profile for distribution circuit between the and the POI is shown in Figure 5 under peak load conditions with generators online. Figure 5: Voltage Profile at POI The average voltage unbalance at the solar...
AI summary The voltage profile at the solar generator POI on a 12.47 kV system shows an average unbalance of 0.53% under peak load conditions, with variations influenced by load, time of day, and season. Figure 5 illustrates the voltage distribution profile.
REDACTED CI C0083591 Attachment 1 Page 20 of 39 REDACTED (CONFIDENTIAL INFORMATION REMOVED) NSPI distribution circuits typically experience less than 3% voltage unbalance (defined as the maximum deviation from the average phase-to-phase vo...
AI summary NSPI distribution circuits typically maintain less than 3% voltage unbalance but cannot guarantee this under all conditions. The Interconnection Customer is responsible for ensuring solar generators can operate within these voltage parameters.
5.7 Voltage Regulation and Voltage Dip As per Section 6.17 of the DSIR, all inverter based Generating Facilities shall be CSA certified and meet the functional requirements of CSA C22.3 No. 9:20 "Interconnection of distributed energy resou...
AI summary The Petpeswick Solar farm's voltage changes under load conditions are analyzed to ensure compliance with CSA standards. Load flow simulations show voltage fluctuations within allowable limits (≤2.5%), confirming the project's compatibility with the distribution system under both heavy and light load scenarios.
5.8 Protection and Control Settings Should it become necessary in the future to alter the settings of the substation recloser as a result of the new generation, any costs associated with modifying the device coordination settings or contro...
AI summary The document states that if future modifications to substation recloser settings are needed due to new generation, the Interconnection Customer will bear the associated costs for adjusting device coordination settings or controls.
6.0 INTERCONNECTION FACILITIES REQUIREMENTS The following subsections outline the Interconnection Facility requirements and the responsibilities of the Interconnection Customer and NSPI for procurement and installation. All costs incurred...
AI summary The section outlines interconnection facility requirements, specifying that the Interconnection Customer bears all costs incurred by NSPI. NSPI owns distribution spans up to the gang-operated disconnect switch and controls the recloser at the POI, while the customer owns equipment beyond the gang switch. Compliance with the Standard Protection Code is mandated for safety.
6.1 Facilities Procured by NSPI at the Interconnection Customer's Expense The following modifications will be required in order to provide a suitable supply to the site:
AI summary Section 6.1 outlines modifications required by NSPI to provide suitable supply to an interconnection customer's site, emphasizing facilities procured at the customer's expense. Key focus is on infrastructure adjustments necessary for interconnection compliance and service delivery.
6.1.1 Recloser A new electronic recloser complete with internal PTs; a remote protection cabinet; and electronic controller must be installed at the Point of Interconnection for the Petpeswick Solar Site.
AI summary A new electronic recloser with internal potential transformers, a remote protection cabinet, and an electronic controller must be installed at the Point of Interconnection for the Petpeswick Solar Site, ensuring compliance with interconnection standards and grid reliability requirements.
6.1.3 Primary Metering Primary metering rack consisting of three metering class potential transformers rated 7,200-120 V, and three metering class current transformers with CT ratios 200:5 A and rating factor 1.3. All instrument transforme...
AI summary The primary metering system includes potential and current transformers specified by NSPI. The Interconnection Customer must install a bidirectional revenue meter owned by NSPI, meeting Industry Canada standards and positioned below the primary metering rack. NSPI retains ownership of all metering equipment.
6.1.4 Communications For Generating Facilities of less than 5 MW, the Interconnection Customer is responsible for providing either 'near' time or 'real' time telemetry (i.e., modem, internet, etc.) to provide the NSPI system operator with...
AI summary For generating facilities under 5 MW, the Interconnection Customer must provide real-time or near-time telemetry (e.g., modem, internet) to NSPI's system operator, reporting generator output every 10 minutes. Implementation details are in Section 4.18, with all costs borne by the Interconnection Customer.
REDACTED CI C0083591 Attachment 1 Page 22 of 39 REDACTED (CONFIDENTIAL INFORMATION REMOVED) - Electronic recloser complete with internal PTs; a remote protection cabinet; and electronic controller must be installed at the Point of Intercon...
AI summary The document outlines requirements for installing electronic recloser equipment with PTs, a remote protection cabinet, and an electronic controller at the Point of Interconnection, including a procurement security cost of $95,850+ HST and a 12-month lead time for Primary Metering.
6.3 Facilities Procured by the Interconnection Customer The Interconnection Customer is responsible for procurement of all facilities required for the operation of the solar installation.
AI summary The Interconnection Customer bears full responsibility for procuring all facilities necessary for the solar installation's operation, including infrastructure, equipment, and associated systems.
6.3.1 Isolating Device-Gang-Operated Switch A gang-operated, NSPI accessible, and lockable switch, capable of providing a visible break, is required between the Generating Facility and its connection point behind the meter. This shall meet...
AI summary A gang-operated, lockable switch with a visible break is required between the generating facility and the connection point behind the meter, as per NSPI standards. This device must be accessible to NSPI and meet specific safety and operational criteria.
6.3.2 Solar Generation Site The engineering, procurement, and construction of the solar generators, associated step-up transformers, and equipment grounding will be the responsibility of the Interconnection Customer. Final designs and equi...
AI summary The Interconnection Customer is responsible for engineering, procurement, and construction of solar generators and related equipment, with NSPI retaining authority to review and approve final designs and equipment selections for the Solar Generation Site.
6.3.3 Step-Up Transformer The Interconnection Customer will acquire and install generator step-up transformers: 2500 kVA, 0.6 kV – 12.47 kV, Y-Yg, step-up transformer with a Grounded Wye (HV) - Delta (LV) configuration and an impedance of...
AI summary The Interconnection Customer is required to install a 2500 kVA, 0.6 kV – 12.47 kV, Y-Yg step-up transformer with a Grounded Wye-Delta configuration, 5.75% impedance, and X/R=8, as per their proposal.
6.3.4 Right of Way for 12.47 kV Modifications The Interconnection Customer will acquire the right-of-way and clear it for all line modifications required to Interconnect the Petpeswick Solar Site to the Distribution System. The Interconnec...
AI summary The Interconnection Customer is responsible for acquiring and clearing the right-of-way (ROW) for 12.47 kV modifications to connect the Petpeswick Solar Site to the distribution system, providing easements to NSPI, constructing an access road, and transferring ownership of the POI to NSPI post-construction. Appendix C outlines ROW requirements.
6.4 Operational Control of Electrical Lines and Equipment NSPI shall have operational control over any Interconnection Facilities it deems necessary to ensure reliability or serviceability of the Distribution System. Operational Control of...
AI summary NSPI retains operational control over Interconnection Facilities deemed necessary to ensure the reliability and serviceability of the Distribution System. The text emphasizes NSPI's authority in managing electrical infrastructure to maintain system integrity.
REDACTED CI C0083591 Attachment 1 Page 23 of 39 REDACTED (CONFIDENTIAL INFORMATION REMOVED) Interconnection Customer's high voltage and low voltage equipment shall be designated in the Standard Small Generator Interconnection and Operating...
AI summary The document specifies that high and low voltage equipment of the interconnection customer must be designated in the Standard Small Generator Interconnection and Operating Agreement (SSGIA), with the party holding operational control responsible for safe and correct operation of electrical lines and equipment.
The Interconnection Customer shall pay the full actual cost of the upgrades and additions required to the NSPI Distribution System in order to accommodate their solar Generation Facility. Table 11:Cost Estimates Modifications Customer Fund...
AI summary The Interconnection Customer is required to cover the full actual cost of upgrades and additions to the NSPI Distribution System to accommodate their solar Generation Facility. The document includes a table for cost estimates and a section labeled 'CONCLUSIONS' though it is not elaborated on.
This study was initiated to determine the requirements and conditions for the proposed interconnection of 2.2 MW of solar generation with inverters by the Interconnection Customer (IC) at the West Petpeswick Road, Musquodoboit Harbour, Nov...
AI summary This report outlines the requirements for interconnecting a 2.2 MW solar generation facility at West Petpeswick Road, Musquodoboit Harbour, Nova Scotia. Alternative C was selected based on the Regional Planner’s recommendations and discussions with the Interconnection Customer. A gang-operated switch is required between the generating facility and the connection point.
REDACTED CI C0083591 Attachment 1 Page 25 of 39 REDACTED (CONFIDENTIAL INFORMATION REMOVED) The Interconnection Customer shall pay a capital contribution for any required line extensions, upgrades, and right-of-way acquisition necessary to...
AI summary The Interconnection Customer must cover capital contributions for line extensions, upgrades, and right-of-way acquisition, while NSPI manages maintenance at their request. Compliance with technical requirements, power factor specifications, and flicker emission mitigation is mandated. NSPI reserves the right to disconnect if flicker issues persist.
REDACTED CI C0083591 Attachment 1 Page 26 of 39 REDACTED (CONFIDENTIAL INFORMATION REMOVED) • NSPI shall have sole operational control over all NSPI owned high voltage equipment at the Petpeswick Solar Site. Operational Control of the Inte...
AI summary NSPI retains sole operational control over its high-voltage equipment at the Petpeswick Solar Site, while the Interconnection Customer's equipment control is governed by the SSGIA. The Interconnection Customer must comply with electrical codes, obtain permits, and ensure inspections by NSPI's Electrical Inspection Authority, including CSA-certified equipment and adherence to the Canadian Electrical Code.