IEEE Power & Energy Magazine - March/April 2015 - 28

table 1. The potential outcomes of an integrated approach.
Feeder-specific hosting capacities

Determine the existing hosting capacity for each feeder across the entire distribution
system under current grid configurations

Optimal DER location

Identify locations that can minimize the upgrades necessary to accommodate DERs

Improved fast-screening techniques

Improve screening techniques that efficiently account for the proposed DERs and
associated grid capacity at that location

Substation-level hosting capacities

Improve visibility into substation-level capacity for accommodating PVs connected
at the individual feeder level

Range of issues and costs for
accommodating DERs across the
distribution system

Provide better insight into the specific issues that can arise and where and how
often they may occur throughout the system

Range of values that can be garnered
through widespread adoption of DERs

Provide better insight about the true value of widespread DER adoption throughout
the system

Aggregate amount of DERs across
a system for bulk system analysis

Identify locations and aggregate DERs for improved bulk system studies

Impact of DERs on system reconfiguration

Streamline processes that can be repeated in an automated fashion for additional
distribution configurations

performing hosting capacity assessments with respect to
voltage and protection impacts, energy and capacity assessments across the fleet can be performed as well.
Various applications can be realized after evaluating the
distribution system in a more holistic manner by applying such
a method across an entire distribution system and taking into
consideration 1) DER characteristics, 2) locational impacts,
and 3) grid performance metrics. Several key outcomes of this
more integrated approach are described in Table 1.

Programmatic Implementation
of a Proactive Plan
This new knowledge lets utilities develop strategies that can
influence the locational deployment of DERs. Distribution
utilities can tactically direct DER development to areas of
the grid that are better suited to accommodate the resource.
Costs associated with the deployment of DERs in suboptimal areas can be avoided. At the same time, the benefits of
DERs can be used to support utility operations.

DER Distribution

Hosting Capacity

implemented to accommodate load growth or for contingency reasons. This aspect is critical when there is a need to
understand the impacts (in terms of cost and value) of DERs
spread across an entire distribution service territory.
This streamlined hosting capacity method utilizes the
feeder model to determine voltage profiles, short-circuit
impedances, feeder topologies, and customer characteristics. Voltage and protection issues related to hosting capacity
can be effectively determined by correlating several voltage
profiles corresponding to different load levels with the shortcircuit impedance of the feeder and the probable distribution
of DERs. The locational distributions and resultant hosting
capacities are shown in Figure 7. The number of laterals and
the overall feeder topology are also factors instrumental in
determining the appropriate hosting capacity.
Determining a feeder's hosting capacity is only part of
the solution, however. Additional systemwide benefits and
impacts can be quantified and garnered through proper
analysis. In a manner similar to the streamlined method for

A

B
DER Location

C

A

B
DER Location

C

figure 7. A simplistic illustration of the location and hosting capacity for a streamlined approach. The distribution
describes what was evaluated, and the hosting capacity describes the outcome.
28

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Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - March/April 2015

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IEEE Power & Energy Magazine - March/April 2015 - Cover3
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