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For a converter using the digital processor for control system, the digital time delay is a main reason to reduce the system bandwidth, leading to a relatively slow dynamic or even unstable operation. To alleviate the negative impacts of digital delays, numerous time delay compensation methods have been developed, of which the model-free schemes are independent to model accuracy whereas the model-based...
Power talk is a novel ultra narrow-band powerline communication (UNB-PLC) technique for communication among control units in MicroGrids (MGs). Unlike the existing UNB-PLC solutions, power talk does not require installation of additional dedicated communication hardware and, instead, uses only the power electronic converters through which the control units interface the common bus. This way the communication...
The proportional capacitor-current feedback active damping method has been widely used to suppress the LCL-filter resonance. However, the time delay in the damping control loop may lead to non-minimum phase or even unstable responses when the resonance frequency varies in a wide range. To improve the robustness of damping, this paper proposes an improved damping controller with the capacitor current...
The capacitor voltage of an LCL-filter can also be used for active damping, if it is fed back for synchronization. By this way, an extra current sensor can be avoided. Compared with the existing active damping techniques designed with capacitor current feedback, the capacitor voltage feedback active damping would however demand a noise-sensitive derivative term. A digital realization of this derivative...
Modular Multilevel Converter (MMC) has recently become a popular multilevel topology for high-power applications, where the reliability performance is a crucial design consideration. In this paper the impacts of the circulating current in the MMC to the loss and thermal loading of power semiconductor devices are comprehensively investigated. Also a novel control strategy by utilizing the circulating...
This paper investigates on the active power sharing of an autonomous hybrid microgrid. Unlike existing microgrids which are purely ac, the hybrid microgrid studied here comprises a dc and an ac sub-grid, interconnected by a power electronic interface. To avoid complexity and save cost, the power interface should preferably be a simple traditional six-switch converter, capable of processing energy...
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