IEEE Power & Energy Magazine - March/April 2017 - 59

The working group was formed with nine permanent members
representing the state utilities, government agencies,
the DPU, and the DER customers/developers.
penetration level of X% means if the DER size exceeds own, and operate up to 20 MW of solar generation with adX% of the connecting feeder section load, a full im- vanced inverter functionalities within targeted towns in the
pact study is required. The DPU allowed the state utili- state. On 28 June 2014, the DPU responded with a favorable
ties to use 67% as the penetration screen and tasked order. As IEEE 1547, Standard for Interconnecting DisTSRG to do a thorough evaluation on the penetration tributed Energy Resources with Electric Power System, is
screen level. The working group started this task currently under revision to allow advanced DER interconby reviewing the penetration screens, which were nections with grid support functionalities, National Grid
implemented in California and other states. After con- received this favorable order to conduct research and testsidering the Massachusetts utilities' work methods, the ing with the a goal of allowing future DER customers to
working group recommended increasing the penetra- utilize the advanced functions. National Grid has utilized
tion screen threshold to 100% to allow more DER ap- the TSRG as the best venue to discuss the technical atplications to remain in the supplemental review process, tributes of the project and to share the status of the solar
which required less study time and cost. The working phase II program deployment.
National Grid has also conducted a technical tour for
group also worked on screens b and c of the supplemental review and documented the common and dif- TSRG members to further discuss the field experience of the
ferent practices among utilities to ensure transparency. program as well as the advanced inverter function testing.
3) Interconnection standards for all Massachusetts utili- Figures 1 and 2 are photos of the tour at a 1 MW solar site
ties. After four years of meetings to discuss various with advanced inverter functions. In Figure 2, the presenter
technical challenges associated with the DER inter- is describing how the inverters can be controlled remotely
connections, each Massachusetts state utility has its via a laptop connected to the Wi-Fi.
Another important topic that has been continuously disown interconnection guideline. The technical discussions with the TSRG members helped significantly to cussed at the TSRG meetings is IEEE 1547, which provides
a set of requirements that each DER shall meet to connect
develop these guidelines.
4) Point of common coupling recloser requirement. After to the distribution EPS. When the standard was developed,
discussions at the working group meetings, the utility the penetration of DERs on the electric power system (EPS)
members agreed to set the DER
size threshold of 1 MW to require
a recloser for protection purposes.
As a result, a state-level common
practice was achieved, which benefited the DERs smaller than 1 MW.
There are also many other areas where
the working group was able to help the
utilities harmonize their interconnection requirements. The group also maintains an Excel sheet that summarizes the
interconnection guidelines of each state
utility. The common guideline along
with the Excel sheet is posted onto the
Massachusetts TSRG website.
The TSRG has also served as a proper venue for the state utilities to discuss
and develop programs of renewable energy interconnections. On 31 December
2013, National Grid, a Massachusetts figure 2. National Grid's Solar Phase II program tour. The presenter is describing
utility, submitted its solar phase II the remote access capability of the inverters. (Photo used with permission from
plans to the DPU for approval to build, National Grid.)
march/april 2017

ieee power & energy magazine

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Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - March/April 2017

IEEE Power & Energy Magazine - March/April 2017 - Cover1
IEEE Power & Energy Magazine - March/April 2017 - Cover2
IEEE Power & Energy Magazine - March/April 2017 - 1
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IEEE Power & Energy Magazine - March/April 2017 - Cover3
IEEE Power & Energy Magazine - March/April 2017 - Cover4
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