Towards next generation virtual power plant: Technology
Download: Download full-size image Fig. 1. Transformation of power plant energy value chain from conventional power plants towards next generation virtual power plants. The
Virtual power plant (VPP) technology aggregates geographically distributed energy resources enabling the management of flexible capacity in the power network on a large scale while implementing local grid constrains.
In parallel to web-based protocols, the interoperability of VPP with other power system components must be supported. The IEC 61850 protocol suite—the dominant communication protocol for data exchange inside power system automation—is also considered for VPP implementation. The generalized architecture of a VPP is presented in Fig. 11.3.
When the VPP acts as a TVPP to provide grid services on the distribution level, it needs to communicate with the DSO. In addition to the message exchange in Fig. 11.7, a VPP needs to receive operational data (power flows, voltage levels, network status, power quality measurements, etc.) from the DSO's SCADA or EMS systems.
Several communication protocols are used in current VPP systems; those frequently used are IEC 60870-5-104, OpenADR 2.0, IEC 61850, and Modbus ( Ancillotti et al., 2013; Samad et al., 2016; Yang et al., 2011 ).
To exchange and forward relevant market-related data, that is, bids to the retailer, who offers services on the electricity market (e.g., intraday, day ahead, balancing, or ancillary service markets), the VPP needs to communicate with a retailer, who operates market platform applications.
VPP communicates in the upstream direction toward the DSO or TSO control center from where the VPP receives commands. The role of TVPPs is to enable DERs to contribute to system management activities ( Pudjianto et al., 2007 ).
Download: Download full-size image Fig. 1. Transformation of power plant energy value chain from conventional power plants towards next generation virtual power plants. The
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