DER VET User Guide/Services/Deferral - Revision history

Mevans at 17:12, 4 May 2021

2021-05-04T17:12:38Z

← Older revision		Revision as of 13:12, 4 May 2021
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	DERs can be utilized to defer investment in additional distribution or transmission capacity. In DER-VET, the “overloaded asset” is the piece of equipment whose power limits would be violated without the DERs and load modeled in DER-VET. The N-0 reliability case is implemented explicitly, although readiness to cover N-1 contingencies can be modeled using the [[DER_VET_User_Guide/Services/~~User~~ \| user]] service. The N-0 case is modeled by assuming the DERs and load are at the same location as the overloaded asset, neglecting any power losses in between the two. Along with a time series deferral load profile, the user inputs a deferral load growth rate, which will escalate the load until the modeled DERs are no longer capable of keeping the power in the overloaded asset within bounds. At this point, the deferral has failed and the upgrade is assumed to have happened, but hopefully the DERs pushed this date back long enough to justify their cost. In years after the deferral failure, the DERs are not constrained to meet the deferral objectives and can operate for economic benefit depending on the other services selected.		DERs can be utilized to defer investment in additional distribution or transmission capacity. In DER-VET, the “overloaded asset” is the piece of equipment whose power limits would be violated without the DERs and load modeled in DER-VET. The N-0 reliability case is implemented explicitly, although readiness to cover N-1 contingencies can be modeled using the [[DER_VET_User_Guide/Services/User_Service \| user]] service. The N-0 case is modeled by assuming the DERs and load are at the same location as the overloaded asset, neglecting any power losses in between the two. Along with a time series deferral load profile, the user inputs a deferral load growth rate, which will escalate the load until the modeled DERs are no longer capable of keeping the power in the overloaded asset within bounds. At this point, the deferral has failed and the upgrade is assumed to have happened, but hopefully the DERs pushed this date back long enough to justify their cost. In years after the deferral failure, the DERs are not constrained to meet the deferral objectives and can operate for economic benefit depending on the other services selected.

	In addition to the simple deferral case modeled in DER-VET, a connection with the software tool DRIVE has been developed. This connection allows the user to perform detailed distribution analysis in an external tool and export the results directly to DER-VET and vice versa. This enables the quick and easy workflow already used at EPRI to perform multi-model analysis involving detailed DER and grid models respectively.		In addition to the simple deferral case modeled in DER-VET, a connection with the software tool DRIVE has been developed. This connection allows the user to perform detailed distribution analysis in an external tool and export the results directly to DER-VET and vice versa. This enables the quick and easy workflow already used at EPRI to perform multi-model analysis involving detailed DER and grid models respectively.

Mevans at 16:27, 4 May 2021

2021-05-04T16:27:57Z

← Older revision		Revision as of 12:27, 4 May 2021
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	= Size Optimization		= Size Optimization =

	The deferral service is not compatible with size optimization.		The deferral service is not compatible with size optimization.

	= Optimization Formulation		= Optimization Formulation =

	Deferral is a constraint (pre-dispatch) service, though this is handled differently from other constraint services. The deferral service pre-calculates the power and energy requirements to meet the deferral in every year of the analysis and then finds the first year where the DERs' capabilities do not meet or exceed the deferral requirements. Time series power and state of energy constraints are applied only for years before the deferral fails.		Deferral is a constraint (pre-dispatch) service, though this is handled differently from other constraint services. The deferral service pre-calculates the power and energy requirements to meet the deferral in every year of the analysis and then finds the first year where the DERs' capabilities do not meet or exceed the deferral requirements. Time series power and state of energy constraints are applied only for years before the deferral fails.

Mevans at 16:24, 4 May 2021

2021-05-04T16:24:14Z

← Older revision		Revision as of 12:24, 4 May 2021
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	In addition to the simple deferral case modeled in DER-VET, a connection with the software tool DRIVE has been developed. This connection allows the user to perform detailed distribution analysis in an external tool and export the results directly to DER-VET and vice versa. This enables the quick and easy workflow already used at EPRI to perform multi-model analysis involving detailed DER and grid models respectively.		In addition to the simple deferral case modeled in DER-VET, a connection with the software tool DRIVE has been developed. This connection allows the user to perform detailed distribution analysis in an external tool and export the results directly to DER-VET and vice versa. This enables the quick and easy workflow already used at EPRI to perform multi-model analysis involving detailed DER and grid models respectively.

	# Inputs		= Inputs =

	## Planned Load Limit		== Planned Load Limit ==
	{\| class='wikitable' style="width: 95%;"		{\| class='wikitable' style="width: 95%;"
	\|-		\|-
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	\|}		\|}

	## Reverse Power Flow Limit		== Reverse Power Flow Limit ==
	{\| class='wikitable' style="width: 95%;"		{\| class='wikitable' style="width: 95%;"
	\|-		\|-
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	\|}		\|}

	## Deferral Load Growth Rate		== Deferral Load Growth Rate ==
	{\| class='wikitable' style="width: 95%;"		{\| class='wikitable' style="width: 95%;"
	\|-		\|-
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	\|}		\|}

	## Deferral Value		== Deferral Value ==
	{\| class='wikitable' style="width: 95%;"		{\| class='wikitable' style="width: 95%;"
	\|-		\|-
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	\|}		\|}

	## Deferral Value		== Deferral Value ==
	{\| class='wikitable' style="width: 95%;"		{\| class='wikitable' style="width: 95%;"
	\|-		\|-
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	\|}		\|}

	# Size Optimization		= Size Optimization

	The deferral service is not compatible with size optimization.		The deferral service is not compatible with size optimization.

	# Optimization Formulation		= Optimization Formulation

	Deferral is a constraint (pre-dispatch) service, though this is handled differently from other constraint services. The deferral service pre-calculates the power and energy requirements to meet the deferral in every year of the analysis and then finds the first year where the DERs' capabilities do not meet or exceed the deferral requirements. Time series power and state of energy constraints are applied only for years before the deferral fails.		Deferral is a constraint (pre-dispatch) service, though this is handled differently from other constraint services. The deferral service pre-calculates the power and energy requirements to meet the deferral in every year of the analysis and then finds the first year where the DERs' capabilities do not meet or exceed the deferral requirements. Time series power and state of energy constraints are applied only for years before the deferral fails.

Mevans: 1 revision imported

2021-03-31T20:41:59Z

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en>MilesEvans at 17:38, 25 February 2021

2021-02-25T17:38:04Z

New page

{{DISPLAYTITLE: {{SUBPAGENAME}}}}

DERs can be utilized to defer investment in additional distribution or transmission capacity. In DER-VET, the “overloaded asset” is the piece of equipment whose power limits would be violated without the DERs and load modeled in DER-VET. The N-0 reliability case is implemented explicitly, although readiness to cover N-1 contingencies can be modeled using the [[DER_VET_User_Guide/Services/User | user]] service. The N-0 case is modeled by assuming the DERs and load are at the same location as the overloaded asset, neglecting any power losses in between the two. Along with a time series deferral load profile, the user inputs a deferral load growth rate, which will escalate the load until the modeled DERs are no longer capable of keeping the power in the overloaded asset within bounds. At this point, the deferral has failed and the upgrade is assumed to have happened, but hopefully the DERs pushed this date back long enough to justify their cost. In years after the deferral failure, the DERs are not constrained to meet the deferral objectives and can operate for economic benefit depending on the other services selected.

In addition to the simple deferral case modeled in DER-VET, a connection with the software tool DRIVE has been developed. This connection allows the user to perform detailed distribution analysis in an external tool and export the results directly to DER-VET and vice versa. This enables the quick and easy workflow already used at EPRI to perform multi-model analysis involving detailed DER and grid models respectively.

# Inputs

## Planned Load Limit
{| class='wikitable' style="width: 95%;"
|-
|style="width: 10%"|Tag
|style="width: 20%"|Key
|style="width: 70%"|Description
|-
|Deferral
|planned_load_limit
|This input sets the maximum power flow through the overloaded asset in in the direction from the transmission system to the loads.
|}

## Reverse Power Flow Limit
{| class='wikitable' style="width: 95%;"
|-
|style="width: 10%"|Tag
|style="width: 20%"|Key
|style="width: 70%"|Description
|-
|Deferral
|reverse_power_flow_limit
|This input sets the maximum power flow through the overloaded asset in in the direction from the loads back toward the transmission system.
|}

## Deferral Load Growth Rate
{| class='wikitable' style="width: 95%;"
|-
|style="width: 10%"|Tag
|style="width: 20%"|Key
|style="width: 70%"|Description
|-
|Deferral
|growth
|The annual non-compounding growth rate of the [[DER_VET_User_Guide/Inputs/Timeseries_File#Deferral_Load | deferral load]] input. This input, when positive, will grow the deferral load every year. Eventually, this will result in the local DERs being unable to shave the forward or reverse power flow peaks, triggering the traditional asset upgrade.
|}

## Deferral Value
{| class='wikitable' style="width: 95%;"
|-
|style="width: 10%"|Tag
|style="width: 20%"|Key
|style="width: 70%"|Description
|-
|Deferral
|price
|This is the economic carrying cost (nominal $/year) of the traditional upgrade that is being deferred by the DERs. This value is applied as a benefit in the benefit-cost analysis in every year for which the DERs successfully defer the traditional upgrade.
|}

## Deferral Value
{| class='wikitable' style="width: 95%;"
|-
|style="width: 10%"|Tag
|style="width: 20%"|Key
|style="width: 70%"|Description
|-
|Deferral
|price
|This is the economic carrying cost (nominal $/year) of the traditional upgrade that is being deferred by the DERs. This value is applied as a benefit in the benefit-cost analysis in every year for which the DERs successfully defer the traditional upgrade.
|}

# Size Optimization

The deferral service is not compatible with size optimization.

# Optimization Formulation

Deferral is a constraint (pre-dispatch) service, though this is handled differently from other constraint services. The deferral service pre-calculates the power and energy requirements to meet the deferral in every year of the analysis and then finds the first year where the DERs' capabilities do not meet or exceed the deferral requirements. Time series power and state of energy constraints are applied only for years before the deferral fails.

The deferral service time series constraints simply ensure that the DERs collectively discharge/generate enough power to keep the net load through the overloaded asset below the planned load limit and that the DERs and loads collectively charge/consume enough power to keep the net load through the overloaded asset above the reverse power flow limit.
* [[DER_VET_User_Guide/Services/Deferral#Reverse_Power_Flow_Limit | Reverse Power Flow Limit]] <= Total Load - ESS Power - Generator Power - Intermittent Generation (note: the reverse power flow limit is usually negative)
* [[DER_VET_User_Guide/Services/Deferral#Planned_Load_Limit | Planned Load Limit]] >= -Total Load + ESS Power + Generator Power + Intermittent Generation

The deferral service will trigger an optimization year both before and after the deferral fails, which are in addition to user-input [[DER_VET_User_Guide/Inputs#Optimization_Years | opt_years]].