Smart Grid standards for buildings
The development of standards for the Smart Grid provides an early look at what's in store for facilities.
By William Mudge, Danfoss Power Electronics Division, Milwaukee
The Smart Grid is modernization of the U.S. electricity infrastructure from both the supply side and the demand side. The supply side includes generating stations; transmission and distribution lines and facilities; and the associated regulatory bodies, utilities, and service providers. The demand side consists of residential, commercial, and industrial electricity customers, and the service providers that help them manage energy use.
Smart grid technology development, funding, and benefits are weighted toward supply-side entities—for example, for smart meter deployment, electrical storage facilities, and special sensors for monitoring and reporting grid conditions. On the demand side, emphasis is on a wider and more standard deployment of demand-response technologies that enable campuses and buildings to better manage on-site power systems and to respond to pricing and control signals from utilities. Note: The Smart Grid is not so much of buildings reducing electricity consumption, but realizing lower electricity bills by managing electricity more strategically.
Many, if not most, of the technologies and processes needed for the Smart Grid already are in place in different markets. California, Texas, and Florida, for example, have robust demand-response markets with buildings responding to pricing or control signals from many utilities. What the Smart Grid movement represents is a massive integration, standardization, and promulgation of these technologies and processes from several states to all or most states.
Even at the 30,000-ft level, the Smart Grid is complex—so it should not be any surprise that the development of new standards is underway to help articulate everything from broad conceptual frameworks for how bulk power will be bought, sold, and transported to the minutia of how buildings’ energy management systems will respond to a pricing signal from a utility.
This article presents a brief overview of the Smart Grid standards that are relevant to buildings.
The transformation of the grid to the Smart Grid began in earnest in 2007 with a $4.3 billion infusion of funding under the American Recovery and Reinvestment Act. In addition to funding demonstration projects, R&D ventures, and the deployment of millions of smart meters, the funding initiated a standards development program chaired by the National Institute of Standards Technology (NIST). Additionally, the U.S. Dept. of Energy formed the GridWise Architecture Council (GWAC) to spearhead the development of interoperability frameworks for the Smart Grid that would facilitate Smart Grid development for the long term while also supporting a gradual migration from the current grid to the Smart Grid.
NIST and GWAC programs are being conducted as public-private partnerships that involve experts from state and federal agencies, industry, and nongovernmental organizations. Development of the Smart Grid standards infrastructure is being conducted in a highly transparent fashion. The standards, guidelines, and reports in development are public (www.nist.gov/smartgrid, and www.gridwise.org), and so are the minutes from meetings, PowerPoint presentations, draft documents, comments, etc.
Smart Grid priorities
As part of its Smart Grid program, NIST has empanelled 18 Priority Action Panels (PAPs), which are reviewing applicable existing standards, initiating and administering the development of new ones, and identifying issues and resolutions that cross multiple standards. Table 1 lists the PAPs by their number and topic. The PAPs cover domains such as setting and communicating pricing, scheduling, and how demand response programs and distributed energy resources are to interoperate.
The PAPs that most directly affect facilities and their interaction on the Smart Grid are PAPs 3, 4, 9, 10, and 17. PAPs 3 and 4 (pricing and scheduling) will feed directly into PAP 9 (DR and DER signals). PAP 10 will establish how meter data or other usage data (which might be communicated by sensors over the Internet rather than through a meter) will communicate. PAP 17 will “lead to development of a data model standard to enable energy consuming devices and control systems in the customer premises to manage electrical loads and generation sources in response to communication with the Smart Grid.” Engineers, owners, and other professionals in the buildings industry who are interested in following Smart Grid developments can learn much by following the PAPs via the NIST website (http://collaborate.nist.gov/twiki-sggrid/bin/view/SmartGrid/PriorityActionPlans).
Table 1: NIST Priority Action Plans for Smart Grid Standards Development
Facilities and the Smart Grid
Development of the Smart Grid made a decisive turn toward facilities in August 2010, when ASHRAE and the National Electrical Manufacturers Assn. (NEMA) announced they are jointly developing Standard 201P, Facility Smart Grid Information Model. According to ASHRAE, 201P will provide a common basis for electricity consumers to describe, manage, and communicate about electrical energy consumptions and forecasts. For example, real-time pricing or demand-response signals sent from utilities to customers will conform to the 201P model, allowing facilities to accept, translate, and react by rescheduling loads or reducing loads by dimming lights and resetting thermostat setpoints.
You can see from the description of 201P how other standards are needed and will come into play, such as the standards being developed by the PAPs for pricing, scheduling, and DR and DER signaling. In fact, the ASHRAE/NEMA standard committee is chaired by NIST staff scientist Steve Bushby, who also is chair of NIST PAP 17, so PAP 17 and the ASHRAE committee are tightly related.
Smart Grid planning and approaches
Because the Smart Grid standards affecting facilities have not yet been completed, it is premature to discuss exactly what they will contain and how facilities will apply them. What can be said, however, is that standards are being developed in a way that will facilitate gradual transformation of the grid. This will enable facilities owners and engineers to ramp up their participation in the Smart Grid in accordance with their business goals, comfort level, and budgets.
Table 2 is a rough hierarchy of Smart Grid approaches that engineers and owners can use to map out how they might want to gradually build up a facility’s Smart Grid capabilities. What’s apparent from the hierarchy is that many of the capabilities deemed to be applicable to the Smart Grid already exist today. For example, automated demand response is widely practiced in some states, such as California and Texas, and many facilities have been generating their own power for decades from on-site plants or from cogeneration.
The Smart Grid is bringing new goals of standardization and automation, in addition to security, privacy, and accountability. There also are regulatory barriers being dismantled, supply-side issues being resolved, and new information markets being built. These developments will usher in a new era of entrepreneurialism for technology development and energy services. Engineers will find these new Smart Grid approaches will offer tremendous benefits in their design and specification of commercial and industrial facilities.
Table 2: Hierarchy of Facility Smart Grid Involvement
1: Usage data
Install smart meter or other capability providing data on energy usage. Reporting capability should support statistical reduction, visualization, and analysis for fast and easy consideration by owners and operators.
Energy data provides basis for energy management, utility rate negotiations, and escalation of future smart-grid investments.
2: Demand response
Enable facility to accept and respond to real-time pricing signals from utility. Response can be semiautomatic (human intervention) or automatic (no human intervention). Owners will want to retain authority to respond to pricing signals. Range of response can be on/off or application of variable-speed technologies for ramping loads down and up (which is gentler on equipment). Research suggests that automated demand response is more reliable and leads to greater load reductions. Research also suggests thermostat setpoints yield the biggest bang for the buck, followed by lighting controls.
Demand response capabilities enable owners to contract with utilities for a lower rate, which reduces operating costs. Loads shifted to off-peak hours can realize additional savings from lower nighttime or weekend rates. If time-of-use rates are in effect, off-peak generation of ice for thermal storage may provide a cost-effective alternative to on-peak air conditioning operation.
3: Distributed energy resources
Facilities or campuses that have access to on-site or neighborhood power sources, such as PV, wind, microturbines, and standby gensets, cross the line from becoming “consumers” to hybrid consumer/provider. The common term for this is “microgrid.” Smart grid technologies enable owners to determine how much grid power they want to use and how much microgrid power to use or sell.
Owners can process pricing and scheduling signals from the utility in consideration of contractual obligations, fuel costs, and environmental regulations to contrive optimal mixes of demand response and supply generation.
- Mudge has worked in the buildings industry since 1975 and joined Danfoss in 2000, where he is the vice president of the HVAC sales for power electronics division. He is a member of the Air-Conditioning, Heating, and Refrigeration Institute (AHRI) board of directors and is chairman of the AHRI VFD Product Section.