As energy demand continues to grow, there have been many highlighted issues faced in the power industry: reliance on aging fossil fuels, rising energy costs, aging infrastructure, and a need to turn to multiple sources of generation to meet this demand while reducing carbon emissions. In efforts to modernize our grid, there have been many technological advancements that have increased its resilience, reliability, and system intelligence.
These new technologies across the energy sector are shifting us toward decentralized energy systems. A commonly discussed advancement is the inclusion of renewable energies such as wind, solar, and battery storage to supplement grid flexibility and integrate new energy sources. These have been continuously adding more energy contribution to the grid every year, and are utilized in many different ways, as seen in their usage as DERs (distributed energy resources). DERs are typically smaller-scale sources of generation at the distribution level that are intended to be located more closely to their loads, rather than provide large-scale generation like power plants.
With a continuous rise in the use of DERs in the power grid comes a need for systems to manage and maintain the power that is generated such that the grid is capable of handling and utilizing all these additions. Two important systems involved that operate at different levels of scale have become critical technologies that are shaping our modern power grid operations: DERMS(Distributed Energy Resource Management System) and microgrids.
What is DERMS (Distributed Energy Resource Management System)?
Compared to microgrids is the scalable implementation of DERMS, which is a logical system used to manage and regulate the operation of DERs. It can be utilized as a standalone platform or even integrated with existing ADMS used by utilities. Given the volatile nature of many types of distributed generation, the management of them involves closely monitoring and controlling their usage.
DERMS integrate DERs into one platform for central coordination with real-time visibility and advanced forecasting powered by artificial intelligence. For example, a resource management system DERMS is capable of tracking wind speed and turbine output for wind turbines, performing curtailing for solar photovoltaic (PV) arrays, tracking and adjusting charging times for electric vehicles, and managing the charging and discharging patterns of battery storage and broader energy storage systems. In standardizing their functions and communication protocols, the integration between a grid DERMS and local DERs is maintained such that components between each would not require further custom software, reducing complexity. Likewise, DERMS can serve as the link between DERs and the grid. The grid optimization capabilities of DERMS are highlighted in their ability to aggregate DERs to be viewed and managed as a collective. By maximizing DER flexibility , Grid DERMS serve to properly handle the continuous installation of DERs and successfully integrate them into the grid.
How DERMS Works Within the Power Grid
One core aspect of DERMS is its ability to interact with distribution management systems (DMS). For these systems, DERMS can be utilized for the typical challenges faced in grid operations, such as bidirectional power flow, and grid optimization. As such, DERMS are directly improving system performance, network efficiency, and grid stabilization. They address common grid challenges across the entire electrical grid.
They can be used to view DERs as combined controllable groups, simplifying and optimizing the process of dispatching them. This integrates them into DMS in such a way that grid operators and distribution system operators can view DERs through the familiar interface of the DMS, especially in network models where the impact and locations of DERs are visualized. This real-time monitoring of generation assets ensures optimal energy resource management. Especially given that bidirectional power flow is more prominent in modern grids, the involvement of DERMS for power flow control proves to be vital as the DERs directly responsible for bidirectional power flow can be properly managed to minimize disruption. Keeping power flowing smoothly is critical. Given the location of DERs, they are often much closer to the end user than power plants. Having access to the information of DERs through DERMS allows for a much different level of grid edge visibility and control for a given DMS compared to those without integration with DERMS.
What Are Microgrid Systems?
Microgrids are small-scale grids that are capable of running separately from the main power grid. This is typically done through power generated from dedicated small-scale DERs, such as solar panels, fuel cells, combined heat and power units, and battery storage. These are not exclusive to commercial and industrial applications, as local communities and homes can be provided with electricity as well through the implementation of community Microgrid systems.
They also provide much-neededgrid resilience to more remote regions, as the reliability of a microgrid can ensure that power is deliveredwhere transmission lines are impractical due to geographical challenges or high costs. Microgrids run in two distinct operating modes: grid-connected and islanded.
While in grid-connected, the microgrid maintains a connection to the main power grid powering a given larger area. It can both generate excess power from DERs to send to the main power grid or have the DERs act as a supplement to the power taken from the main power grid to support local operations. While islanded, a microgrid is completely disconnected from the main power grid and operates individually to power only their local area. Because they function independently, generation is solely reliant on their DERs, leaving the microgrid in a self-sufficient state without relying on the main power grid. The resilience provided from a microgrid in islanded mode is critical for many different scenarios where critical facilities still needs to be powered in the event of an outage, such as hospitals and data centers.
How Microgrids Operate and Support Energy Reliability
Microgrids utilize dedicated control systems that allow for the seamless integration of local power production. By managing localized DERs like battery storage systems and solar arrays, these systems ensure reliable electricity is maintained even during broader grid outages and power outages. They operate independently to provide backup power when the main grid fails. This localized backup power provides immense benefits for energy security, energy management, and overall grid flexibility, especially at the grid edge, ensuring facilities maintain normal operations regardless of the macro-grid’s status.
DERMS vs. Microgrids: Key Differences Explained
| Feature | DERMS | Microgrid Systems |
|---|---|---|
| Primary Scope | Grid-wide coordination across multiple regions | Localized, site-specific control |
| Operation Type | Functions as a large virtual power plant | Operates as a distinct physical micro-network |
| Visibility | Complete network overview for utilities | Limited strictly to the local microgrid |
| Control | Aggregates utility-scale and scattered DERs | Manages dedicated local DERs |
| Connectivity | Always grid-connected | Operates both grid-connected and islanded |
How DERMS and Microgrids Work Together
While they serve different primary functions, they are complementary technologies. A management system DERMS can integrate and coordinate multiple independent microgrid systems and multiple DERs across the broader grid.
Through a single interface control, operators gain greater visibility into energy usage and how much power a microgrid is drawing or supplying at any given moment. This allows for the key optimization of energy resources across the entire network, significantly boosting overall grid flexibility.
Role of DERMS and Microgrids in Energy Markets
Both technologies open new avenues for market participation for distributed energy resources. By intelligently aggregating assets, DERMS can bid aggregated DER capacity into wholesale markets, providing valuable grid services, participating in demand response programs, and optimizing energy costs based on real-time forecasting. Microgrids contribute by shedding load or supplying excess power back to the grid during peak demand. Following IEEE power standards, these systems are fundamentally changing how the evolving energy society values and monetizes distributed power generation from a diverse range of energy sources.
Benefits for Utilities and Grid Operators
Implementing DERMS allows utilities to achieve better DER usage and system reliability. The capabilities of these systems support utilities in turning unpredictable renewable energy sources, like wind energy, into dispatchable, controllable assets. Through comprehensive data analysis and proactive maintenance alerts, DERMS drives operational efficiency, reduced costs, and improved grid stability, allowing utilities to proactively manage loads rather than reactively dealing with voltage drops.
Challenges in Implementing DERMS and Microgrid Systems
Despite the clear benefits, these technologies present new challenges in the modern energy world. Data integration remains a significant hurdle, as tying thousands of endpoints into unified network models requires immense processing power and control complexity. Furthermore, balancing loads when there is less power available from renewables, ensuring interoperability between legacy utility systems and new software platforms, maintaining strict cybersecurity protocols, and ensuring scalability as more generation assets come online are primary concerns for grid operators.
Future of DERMS and Microgrids in Grid Modernization
Given the growing role of renewable energy, electrical vehicles, and energy storage, there will keep being a need to manage these volatile contributors to the power grid. Boosted by recent tax credits and funding opportunities, DERs will continue to see involvement in both microgrid operations and integration with DERMS. Utilities need not only visibility of additional grid assets like DERs, but also the technology of DERMS to both interpret information from DERs in a quick and optimal manner and effectively manage them. Alongside this, the need for microgrids in various critical operations and areas as well as its usage as an additional resource for the grid proves that both are critical technologies for future grid reliability.
FAQs
What is the main difference between DERMS and microgrid systems?
The main difference is scope. DERMS provides grid-wide coordination and energy resource management for utilities, while microgrids provide localized control and power production for a specific site or community, with the unique ability to disconnect (island) from the main grid.
Can microgrids operate without a DERMS?
Yes, microgrids have their own dedicated, localized control systems that allow them to function independently, especially when islanded. However, integrating them with a DERMS allows the broader utility grid to interact with and optimize the microgrid’s excess capacity.
How do DERMS improve grid reliability and efficiency?
DERMS improve reliability by providing real-time visibility and forecasting for volatile renewable resources. They allow operators to aggregate these resources to balance supply and demand dynamically, smooth out voltage fluctuations, and optimize power flow efficiently across the network.
Are DERMS required for distributed energy resources integration?
While single DERs can be integrated locally without a DERMS, managing thousands of distributed energy resources (DERs) at scale across a utility network effectively requires a DERMS to prevent grid instability and to utilize the resources for grid optimization.
How do utilities use DERMS with community microgrids?
Utilities use DERMS to treat community microgrids as flexible, dispatchable assets. The DERMS can communicate with the microgrid’s control system to request power during peak demand or to absorb excess generation from the main grid, benefiting both the utility and the community.
