Qing-Chang Zhong - Power Electronics-Enabled Autonomous Power Systems

17 Chapter 17Figure 17.1 The model of a single‐phase inverter.Figure 17.2 The closed‐loop system consisting of the power flow model of an ...Figure 17.3 Interpretation of transformation matrices and . (a) . (b) ....Figure 17.4 Interpretation of the universal transformation matrix .Figure 17.5 Universal droop controller.Figure 17.6 Rel‐time simulation results of three inverters with different ty...Figure 17.7 Experimental set‐up consisting of an L‐inverter, an R‐inverter, ...Figure 17.8 Experimental results with the universal droop controller. (a) ...

18 Chapter 18Figure 18.1 The self‐synchronized universal droop controller.Figure 18.2 Experimental results of self‐synchronization with the R‐inverter...Figure 18.3 Experimental results when connecting the R‐inverter to the grid....Figure 18.4 Experimental results with the R‐inverter: performance during the...Figure 18.5 Experimental results with the R‐inverter: regulation of system f...Figure 18.6 Experimental results with the R‐inverter: change in the DC‐bus v...Figure 18.7 Experimental results of self‐synchronization with the L‐inverter...Figure 18.8 Experimental results with the L‐inverter: connection to the grid...Figure 18.9 Experimental results with the L‐inverter: performance during the...Figure 18.10 Experimental results with the L‐inverter: regulation of system ...Figure 18.11 Experimental results with the L‐inverter: change in the DC‐bus ...Figure 18.12 Experimental results of self‐synchronization with the L‐inverte...Figure 18.13 Experimental results from the L‐inverter with the robust droop ...Figure 18.14 Experimental results from the L‐inverter with the robust droop ...Figure 18.15 Experimental results from the L‐inverter with the robust droop ...Figure 18.16 Experimental results with the L‐inverter under robust droop con...Figure 18.17 A microgrid including three inverters connected to a weak grid....Figure 18.18 Real‐time simulation results from the microgrid. (a) Real power...

19 Chapter 19Figure 19.1 A general three‐port converter with an AC port, a DC port, and a...Figure 19.2 DC‐bus voltage controller to generate the real power reference....Figure 19.3 The universal droop controller when the positive direction of th...Figure 19.4 Finite state machine of the droop‐controlled rectifier.Figure 19.5 Illustration of the operation of the droop‐controlled rectifier....Figure 19.6 The ‐converter.Figure 19.7 Control structure for the droop‐controlled rectifier. (a) Contro...Figure 19.8 Experimental results in the GS mode. (a) Real power , grid volt...Figure 19.9 Experimental results in the NS‐H mode. (a) Real power , grid vo...Figure 19.10 Experimental results in the NS‐L mode. (a) Real power , grid v...Figure 19.11 Transient response when the system starts up. (a) Real power ,...Figure 19.12 Transient response when a load is connected to the system. (a) ...Figure 19.13 Experimental results showing the capacity potential of the rect...Figure 19.14 Controller for the conversion leg.Figure 19.15 Comparative experimental results with a conventional controller...

20 Chapter 20Figure 20.1 A grid‐connected single‐phase inverter with an filter.Figure 20.2 The equivalent circuit diagram of the controller.Figure 20.3 The overall control system.Figure 20.4 Controller states. (a) and . (b) and .Figure 20.5 Implementation of the current‐limiting universal droop controlle...Figure 20.6 Operation with a normal grid. (a) Real and reactive power, RMS c...Figure 20.7 Transient response of the controller states with a normal grid. ...Figure 20.8 Operation under a grid voltage sag for 9 s. (a) Real and react...Figure 20.9 Controller states under the grid voltage sag for 9 s. (a) an...Figure 20.10 Operation under a grid voltage sag for 9 s. (a) Real and reac...Figure 20.11 Controller states under the grid voltage sag for 9 s. (a) a...

21 Chapter 21Figure 21.1 Two systems with disturbances interconnected through .Figure 21.2 Two systems with disturbances and external ports interconnected ...Figure 21.3 Three‐phase grid‐connected converter with a local load.Figure 21.4 The controller for a cybersync machine with to be supplied as Figure 21.5 The mathematical structure of the system constructed to facilita...Figure 21.6 Blocks and implemented with the integral controller. (a) . ...Figure 21.7 A cybersync machine equipped with regulation and self‐synchroniz...Figure 21.8 Simulation results from a cybersync machine, where the detailed ...Figure 21.9 Experimental results from a cybersync machine. (a) Around synchr...