Illinois Administrative Code › Title 83 - PUBLIC UTILITIES › Part 466 - ELECTRIC INTERCONNECTION OF DISTRIBUTED GENERATION FACILITIES › Section 466.75 - Limited-Export and Non-Exporting Distribution Energy Resources Facilities

Current through Register Vol. 48, No. 28, July 12, 2024
The following technical specifications are intended to identify
				acceptable export control methods to facilitate the interconnection and parallel
				operation of limited-export and non-export systems with the EDC's electric
				distribution system.
a) If a DER facility
			 uses any configuration or operating mode in subsections (c)(1) through (6) to limit
			 the export of electrical power across the point of interconnection, then the export
			 capacity shall be only the amount capable of being exported (not including any
			 inadvertent export). To prevent impacts on system safety and reliability, any
			 inadvertent export from a DER facility must comply with the limits identified in
			 this Section. The export capacity specified by the interconnection customer in the
			 application will subsequently be included as a limitation in the interconnection
			 agreement. Applicants seeking to interconnect using the operating modes under this
			 Section shall submit proposed control or protection settings in their application
			 for review by the EDC to verify compliance with the requirements of this
			 Section.
b) The export control types and
			 settings listed in subsection (c) are acceptable for controlling export capacity
			 unless the EDC identifies and communicates to the customer during the
			 interconnection screening or study process specific impacts that affect the
			 reliability, safety, operation and power quality of the EDC's system associated with
			 the protection relays, settings and control schemes listed in this Section. In that
			 case, the EDC may identify alternate settings that would be required for safe and
			 reliable interconnection of the proposed DER facility. The EDC may also identify any
			 monitoring and control equipment to be installed at Applicant's expense on DER
			 systems using export control equipment that is required for safe and reliable
			 interconnection and operation of the DER facility.
c) The export controls identified in subsections
			 (c)(1) through (3) are acceptable for non-exporting systems only. The export control
			 identified in subsections (c)(4) and (c)(5) may be used for limited export systems
			 only. The export controls in subsections (c)(6) and (7) may be used for either
			 non-exporting or limited export systems. Inverter-based limited export systems shall
			 use advanced inverters utilizing operating modes and settings specified by the EDC
			 in its written technical standards for interconnection.
1) Reverse Power Protection (Device 32R)
To limit export of power across the point of interconnection, a
				reverse power protective function is implemented using a utility-grade protective
				relay. The default setting for this protective function shall be 0.1 % (export) of
				the service transformer's nominal base nameplate rating, with a maximum 2.0 second
				time delay to limit inadvertent export.
2) Minimum Power Protection (Device 32F)
To limit export of power across the point of interconnection, a
				minimum import protective function is implemented using a utility-grade protective
				relay. The default setting for this protective function shall be 5% (import) of the
				generating unit's total nameplate capacity, with a maximum 2.0 second time delay to
				limit inadvertent export.
3)
			 Relative Distributed Energy Resource Rating
This option requires the DER facility's nameplate capacity to be so
				small in comparison to its host facility's minimum load that the use of additional
				protective functions is not required to ensure that power will not be exported to
				the electric distribution system. This option requires the DER facility's nameplate
				capacity to be no greater than 50% of the interconnection customer's verifiable
				minimum host load over the past 12 months. For systems above 250 kVA, the EDC may
				require additional assurances, equipment, or agreements based upon evaluation of the
				stability and reliability of the minimum load data. This option is not available for
				interconnections to area networks or spot networks.
4) Directional Power Protection (Device 32)
To limit export of power across the point of interconnection, a
				directional power protective function is implemented using a utility-grade
				protective relay. The default setting for this protective function shall be the
				export capacity value, with a maximum 2.0 second time delay to limit inadvertent
				export.
5) Configured Power
			 Rating
A reduced output power rating utilizing the power rating
				configuration setting may be used to ensure the DER does not generate power beyond a
				certain value lower than the nameplate capacity. The reduced power rating shall be
				indicated by means of a nameplate rating replacement, or by a supplemental adhesive
				nameplate rating tag to indicate the reduced nameplate rating. At the discretion of
				the EDC, the applicant may additionally be required to provide a letter from the
				manufacturer confirming the reduced capacity.
6) Limited Export Utilizing Power Control Systems
The following are the minimum requirements for the limited export
				utilizing power control systems that meet the criteria specified in this subsection
				(c)(6). Other factors relevant to the interconnection study process may necessitate
				additional technical requirements that are not explicitly noted in this subsection.
				This option is not available for interconnections to area networks or spot
				networks.
A) DER facilities utilizing this
			 option must use an NRTL-certified UL 1741 power control system and inverter system
			 with a maximum open loop response time of no more than 30 seconds for systems less
			 than or equal to 100 kVA and a maximum open loop response time of no more than 10
			 seconds for systems greater than 100 kVA. The DER facility must disconnect from the
			 electric distribution system, ceasing to energize the electric system or halting
			 energy production within 2.0 seconds if the period of continuous export exceeds 30.0
			 seconds.
B) Failure of the control
			 system or inverter system for more than 30.0 seconds resulting from loss of control
			 or measurement signal, loss of control power, single component failure, or related
			 control sensing of the control circuitry must result in the DER facility entering
			 non-export operation mode whereby no energy is exported across the point of
			 interconnection to the electric distribution system until the customer has
			 reestablished real power output control of the DER facility.
C) An acceptable open loop response time may need
			 to be mutually agreed upon between the EDC and the applicant for DER facilities with
			 a nameplate capacity greater than 1 MVA that utilize a NRTL certified power control
			 system.
COMMISSION NOTE: NRTL testing to the UL power control system
				certification requirements decision shall be accepted until similar test procedures
				for power control systems are included in a standard.
7) Limited Export Using Agreed-Upon Means
DER facilities may be designed with other control systems or
				protective functions to limit export and inadvertent export if mutual agreement is
				reached with the EDC. The limits may be based on technical limitations of the
				interconnection customer's equipment or the electric distribution system equipment.
				To ensure inadvertent export remains within mutually agreed-upon limits, the
				interconnection customer may use an uncertified power control system, an internal
				transfer relay, energy management system, or other customer facility hardware or
				software if approved by the EDC.