The demands of a modern way of life have changed the way power electronics systems work. For instance, the grid has to provide not only the service of delivering electrical energy but also the communication to enable interactions between customers and enable them to be producers of electrical energy, too. Thus, the smart grid has come into existence. The consequence of the smart grid is that consumers could be “smart.” The most obvious consumers are households, so the houses have to also be smart and must be equipped with various power electronics devices for producing and managing electrical energy. Again, all those devices have to communicate somehow and provide data for managing electrical energy in the house. Zoomed in further, novel, state-of-the-art measurement equipment could have been built from different power electronics devices, and communication among them would be necessary for good operation. Zoomed further in, communication among different pieces of power electronics devices (such as converters) could offer benefits such as flexibility, abstraction, and modularity.
This thesis provides insight into different communication techniques and protocols used in power electronics systems. A top-down approach presents three different levels of communication used in real-life projects with all the challenges they bring, starting with the smart house, followed by the state-of-the-art impedance measurement unit, and finalizing with internal power electronics building block (PEBB) communication.
In the case of a smart house, where the house is equipped with solar panels, charge controllers, batteries, and inverters, communication allows interoperation between different
elements of the power electronics system, enabling energy management. Results show the operation of the system and energy management algorithm. A house of this type won first prize at an international competition where energy management was one of the disciplines.
The impedance measurement unit consists of different power electronics devices. In this case, too, communication between devices enables the operation of the impedance measurement unit. Communication techniques used here are shown together with measurement results.
Finally, inter-PEBB communication has been shown as an approach for interaction among the different elements inside the PEBB, such as controller, GDs, sensors, and actuators. Real-time communication protocol, including all challenges, is described and developed. This approach is shown to enable communication and synchronization among different nodes inside the PEBB. Communication enables all internal elements of the PEBB to be transparent outside the PEBB in the sense that data gathered from them could be reused anywhere else in the system. Also, this approach enables the development of distributed event (time) driven control, hardware and software, abstraction, high modularity, and flexibility. A very important aspect of inter-PEBB communication is synchronization. A simple technique of sharing a clock among the parts of a 6 kV PEBB has been shown. / M.S. / This thesis provides insight into different communication techniques and protocols used in power electronics systems. A top-down approach presents three different levels of communication used in real-life projects with all the challenges they bring, starting with the smart house and a custom device designed and developed to be a communication interface among different power electronics devices from different vendors, such as charge controllers or inverters, but with capabilities not only to communicate but to also provide a platform for the development of energy management algorithms used to make houses grid zero if not grid positive.
Aside from the smart house, this thesis describes communication protocols and techniques used in the impedance measurement unit (IMU). This complex measurement device provides valuable and accurate impedance measurements and consists of different power electronics devices that need to communicate.
Finally, at the power electronics building block (PEBB) level, real-time communication protocol with all challenges is described. Developed communication protocol provides communication and synchronization among different nodes such as GDs, sensors, and actuators inside the PEBB. This intra-PEBB communication and synchronization combined with inter-PEBB communication and synchronization provide the foundation for the development of truly distributed event- (time-) driven control as well as hardware and software abstraction.
| Identifer | oai:union.ndltd.org:VTETD/oai:vtechworks.lib.vt.edu:10919/113583 |
| Date | 17 December 2021 |
| Creators | Mitrovic, Vladimir |
| Contributors | Electrical and Computer Engineering, Boroyevich, Dushan, Cvetkovic, Igor, Burgos, Rolando |
| Publisher | Virginia Tech |
| Source Sets | Virginia Tech Theses and Dissertation |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | ETD, application/pdf, application/pdf |
| Rights | CC0 1.0 Universal, http://creativecommons.org/publicdomain/zero/1.0/ |
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