By Raghu Belur, SPW Contributor
Check out our 2019 story with the latest developments on how smart inverters redefine the relationship between distributed generation sites and the grid
And be sure to read our 2018 story on the latest advancements with inverters… Hybrid inverters can future-proof solar+storage installations
The growth of the U.S. solar market over the past five years has been remarkable, with the total number of photovoltaic installations climbing into the hundreds of thousands. This is impressive, but it''s still just a drop in the bucket compared to the tens of millions of rooftop and ground-mount PV systems that will be deployed during the next few decades.
The impact of this ever-growing penetration of distributed, intermittent renewable energy generation makes it imperative that the grid infrastructure become more resilient and intelligent to keep the electricity flowing in a stable and consistent fashion. One critical component that will enable the successful transition is the PV inverter, which will increasingly become the brains of the solar-empowered smart grid.
Advantages Of Using Smart MicroinvertersThe increasing technical complexity and enhanced capabilities of today''s inverters show that many manufacturers are well on their way to meeting the smart inverter challenge, but not all inverter topologies and software control packages are created equal.
Microinverter technology, in particular, provides some advantages to residential, commercial and (eventually) utility-scale solar. This includes high redundancy through a distributed AC architecture that improves system cost and reduces operations and maintenance complexity.
An integrated microinverter package can help lower the levelized cost of energy (LCOE), facilitating higher energy production over the lifetime of the system, unit reliability and system uptime, all the while lowering systems cost by reducing installation labor and materials. Microinverters also are capable of providing a suite of advanced grid functions (AGF) required by some regulatory standards for grid stability, such as ramp rate control, power curtailment, fault ride-through and voltage support through vars.
The most advanced microinverters are adaptive and essentially constitute the core of what could be called a fully networked, software-defined inverter. The benefits of such a software-controlled system include the ability to provide grid support services in an evolutionary manner over the more than 20-year lifetime of the inverter platform through software updates that can be done without any hardware replacement or truck-rolled, hands-on labor.
Although the amount of solar power on many parts of the grid in the United States is growing fast, it remains quite low as a percentage of the overall generation mix. There is one state, however, that is already providing a glimpse of the high-level PV penetration future: Hawaii. As the following case study reveals, the benefits of fully networked, software-defined microinverter architectures have already been experienced in the 50th state by customers and utilities alike.
A major Hawaiian utility contacted Enphase and said that they were experiencing greater voltage fluctuations than in the past and needed to create a wider voltage window to compensate for the variability because of the growing number of solar installations in its service area. The utility requested that the inverters expand their frequency trip limits from 59.6Hz to as low as 57Hz, and insisted that these changes be retrofitted onto PV systems that had been installed in the preceding years.
Working thousands of miles away in a network operations center in the San Francisco Bay area, technicians were able to meet the utility''s new requirements and upgrade the software remotely through the bidirectional communications link on more than 400 PV systems. In addition, the company''s proprietary software platform provided the utility with an automated audit trail of all systems affected by the changes. Ongoing experiments in Hawaii are focusing on new reactive and on-demand communications methodologies that will help manage the greater distributed generation load. These advanced capabilities will not only benefit the islands'' utilities, installers and system owners, but also provide insights into what will eventually need to be done on a much-larger scale on the mainland.
While the digital architecture, bidirectional communications and software infrastructure technologies that underpin smart inverters are certainly important, the companies that provide such advanced systems must also be smart in the way they collaborate on new utility requirements and standards. Such activities as the ongoing UL/ANSI 1741 and IEEE 1547 standards development work as well as the Smart Inverter Working Group (which is providing technical recommendations for the revision of California''s Rule 21 distributed-generation interconnection statute), represent the kind of cooperative efforts that will help ensure the proper implementation of the advanced grid functionality required for the more solarized energy mix of the not-too-distant future.
Raghu Belur cofounded Enphase Energy with Martin Fornage in 2006. He has more than 20 years of experience in the clean energy and high-technology industries.
Where can I find smart inverters with virtual oscillating control features?
its like merging rocket science with typewriter. yeah current solar technology need some automation but the extent that you mentioned is a overkill. remember that technology still has got disadvantages and the anticipation of it to the near future is never possible if not think wisely. however I really think the technology mentioned is quite able to fulfill the promises. happy renewable energy.
There are microinverters that will sense and adjust their otuput voltage to 110-120 or215- 240 ranges. Matching voltage to the grid and matching frequency 50 or 60 ranges plus minus 3 or so cycles per second. Wire up 4 panels to the inverter and plug the ac output into a house plug or mains box with cutout switch. Some will monitor the current consumption of an appliance and adjust the inverter to phase, voltage and only supplement the grid power the appliance consumes so no concerns about back feeding the grid.
A glimpse of the coming future. I hope the mainland utilities engage constructively to implement the solar PV enabled energy landscape of the world.
Great article and idea. A true distributed energy can take advantage of the regulated supply (when sun shines) and boost demand based on the supply intelligent. Great job Raghu.
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Smart inverters are an emerging technology that can help integrate solar energy and other distributed energy resources (DERs) into the electric grid.
Like traditional inverters, smart inverters convert the direct current output of solar panels into the alternating current that can be used by consumers in their homes and businesses. Smart inverters go beyond this basic function to provide grid support functions, such as voltage regulation, frequency support, and ride-through capabilities.
As the number of DERs on the grid increases, the need for additional inverter functionality has grown. Additionally, existing codes and technical standards (e.g., IEEE 1547 and UL 1741) are being updated to ensure that smart inverter capabilities can be fully realized. To unlock the latest inverter functionality, some states are working to incorporate updated codes and standards through months-long processes that are often technical and complex.
IREC is actively involved in state proceedings that tackle the issue of how to integrate and harmonize updated smart inverter standards into their rules (e.g., IEEE 1547-2018). We monitor state-by-state developments and coordinate with a number of partners to ensure a smooth transition to utilizing these new technologies and capabilities. We promote the integration of smart inverters and their valuable functionality, which can increase DER hosting capacity, improve grid reliability, and promote consistency across states and markets.
In November 2022, IREC published its Decision Options Matrix for IEEE 1547-2018 Adoption, a checklist that can help regulators, utility staff, and other DER stakeholders navigate the key decisions they need to make in order to align interconnection rules with IEEE 1547-2018.
In April 2023, IREC published its IEEE 1547™-2018 Adoption Tracker, a resource for Public Utilities Commissions, utility personnel, and other DER stakeholders interested in reviewing the standard''s adoption status across states and regional transmission organizations in the U.S. and Canada.
About Smart solar inverters
As the photovoltaic (PV) industry continues to evolve, advancements in Smart solar inverters have become critical to optimizing the utilization of renewable energy sources. From innovative battery technologies to intelligent energy management systems, these solutions are transforming the way we store and distribute solar-generated electricity.
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