Abstract
Potential performance improvements can be obtained by introducing communication techniques in the power electronic systems. However, network-induced time-delay could bring negative consequences of degrading performance or destabilizing the system in many cases. To investigate and handle the impacts of time-delay, a suit of analytical methodology is proposed, where both delay-insensitive and delay-sensitive control strategies of network-based system have their theoretical methods and different problem-solving paths. The former is to predict the maximum allowable boundaries of time-delay for releasing more network resources, and the latter is to use the controller-altering method for changing its original instability, respectively. The proposed methodology is concretely applied in network-based system of droop-controlled AC (Alternating Current) microgrid in islanded mode. Two different current-sharing strategies are mathematically analyzed and given to verify their validity. Experimental results also show the effectiveness of the proposed methodology in droop-controlled AC microgrid system, which provides theoretical guidance on how to use network-based control for the other power electronic systems.
Highlights
The communication technique has become increasingly important in power electronics area with its developing tendency of standardization and integration
Two approaches can increase the capability of network-based control system effectively in power electronic systems
The general structure of network-based control system with two inverters in parallel using Steady Power Method (SPM) and Transient Power Method (TPM), the reference voltage of each inverter is yielded from droop control and plunged into current control
Summary
The communication technique has become increasingly important in power electronics area with its developing tendency of standardization and integration. Inverter-parallel operation in AC microgrid working with islanded is specified as research application, and two network-based control strategies are introduced for clarifying the relationship between current-sharing performance and network-induced time-delay. If the upper whereaslimit additional network load is dramatically increased In this case, we may needcontrol to study the value is less than one sampling period (marked as “Y”), that means the network-based alternative approaches to alter stability condition with given time-delay. In the proposed analyticalofmethodology, switching period the basic time unit for analysis can facilitate the implementation network-based control on power the discrete time-invariable function.
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