Aggregation in Active Distribution Networks
摘要
The rapid proliferation of distributed energy resources (DER) in recent years presents an escalating challenge for transmission and distribution grid operators globally. This paradigm shift disrupts traditional power systems, which have long been predicated on centralized power generation, necessitating urgent adaptive measures. System operators must handle the complex task of managing thousands of distributed assets in or near real time. However, with the integration of advanced digital technologies and the establishment of conducive regulatory and market frameworks, these challenges can be transformed into opportunities for all stakeholders across the electricity value chain, from generators to end consumers. A key solution to addressing these complexities, already commercially validated and implemented in various regions, is the aggregation of multiple DER outputs. Aggregators offer several unique value propositions to DER asset owners. Among their primary functions are ensuring seamless physical connectivity and communication, facilitating access to diverse energy, ancillary service, and flexibility markets, and mitigating market risks through the diversification of services and DER technologies. The increasing integration of variable renewable energy sources, such as wind and solar, which are often interfaced via inverters, necessitates greater power system flexibility across a wide range of temporal scales—from milliseconds to seasonal cycles. Aggregated and optimally managed DER can play a crucial role in balancing supply and demand, as well as enhancing grid flexibility and resilience. Recent market analyses forecast substantial growth in the global DER aggregation sector, with projections estimating the market size to reach between USD 2 and 3 billion by 2030–2032. This chapter will present insights into various configurations of DER aggregation platforms, highlighting their essential components and functionalities required for seamless connectivity and operation. By doing so, it aims to maximize benefits for all stakeholders involved. Additionally, it will showcase practical examples of DER management systems that have been successfully integrated into distribution grid operations, providing grid services critical for the flexible and secure operation of future power systems with a high penetration of inverter-based resources. The investigations conducted by the CIGRE working group on DER aggregation platforms, as outlined in this chapter, are intended to encourage distribution utilities and the broader energy industry to consider aggregated DER as a viable and cost-effective solution for providing grid flexibility services.