Michigan Administrative Code › Department - Licensing and Regulatory Affairs › Public Service Commission › Interconnection and Distributed Generation Standards › Part 2 - INTERCONNECTION STANDARDS › Section R. 460.980 - Capacity of the DER

Current through Vol. 24-12, July 15, 2024
Rule 80.
(1) If
				  the interconnection application requests an increase in capacity for an
				  existing DER, the electric utility shall evaluate the application based on the
				  new export capacity of the DER. The maximum capacity of a DER is the aggregate
				  nameplate rating. or may be limited as described in the electric utility's
				  interconnection procedures.
(2) An
				  interconnection application for a DER that includes single or multiple types of
				  DERs at a site for which the applicant seeks a single point of common coupling
				  must be evaluated as described in the electric utility's interconnection
				  procedures.
(3) The electric
				  utility's interconnection procedures may describe acceptable methods for power
				  limited export DER including, but not limited to, reverse power protection and
				  utilizing inverters or control systems so that the DER capacity considered by
				  the electric utility for reviewing the interconnection application is only the
				  amount capable of being exported. These methods for power limited export DER
				  may be used as alternatives to the method described in subrule (4) of this
				  rule.
(4) An electric utility shall
				  allow interconnection of limited-export or non-exporting DERs according to this
				  subrule. If a DER uses any configuration or operating mode in this subrule to
				  limit the export of electrical power across the point of common coupling, then
				  the capacity must 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 must comply with the limits in subdivisions
				  (e) or (f) of this subrule. The export capacity specified by the applicant in
				  the application must be included as a limitation in the interconnection
				  agreement. Other means not listed in this subrule may be utilized to limit
				  export if mutually agreed upon by the electric utility and applicant.
				  Interconnections of limited-export or non-exporting DERs are subject to the
				  following options:
To ensure power is never exported across the point of
					 common coupling, a reverse power protective function may be provided. The
					 default setting for this protective function must be 0.1% export of the service
					 transformer's rating, with a maximum 2.0 second time delay.
To ensure at least a minimum amount of power is imported
					 across the point of common coupling at all times and, therefore, that power is
					 not exported, an under-power protective function may be provided. The default
					 setting for this protective function is 5% import of the DER's total nameplate
					 rating, with a maximum 2.0 second time delay.
The nameplate rating of the DER, minus any auxiliary load,
					 must be so small in comparison to its host facility's minimum load that the use
					 of additional protective functions are not required to ensure that power is not
					 exported to the distribution system. This option requires the DER capacity must
					 be no greater than 50% of the applicant's verifiable minimum host load over the
					 past 12 months.
A reduced output 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 rating.
DERs may utilize a Nationally Recognized Testing Laboratory
					 Certified Power Control System and inverter system that results in the DER
					 disconnecting from the distribution system, ceasing to energize the
					 distribution system, or halting energy production within 2 seconds if the
					 period of continuous inadvertent export exceeds 30 seconds. Failure of the
					 control or inverter system for more than 30 seconds, resulting from loss of
					 control or measurement signal, or loss of control power, must result in the DER
					 entering an operational mode where no energy is exported across the point of
					 common coupling to the distribution system.
DERs may be designed with other control systems or
					 protective functions, or both, to limit export and inadvertent export to levels
					 mutually agreed on by the applicant and the electric utility. The limits may be
					 based on technical limitations of the applicant's equipment or the distribution
					 system's equipment. To ensure inadvertent export remains within mutually
					 agreed-upon limits, the applicant shall use an internal transfer relay, energy
					 management system, or other customer facility hardware or
					 software.