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This paper deals with the optimal control of a self-reacting Wave Energy Converter (WEC) where the reaction force is obtained using a damping-plate. Model Predictive Control (MPC) is applied for unconstrained and constrained input control cases. Objective function attempting to optimise the power generation is directly formulated as an absorbed power maximisation problem and thus no optimal reference,...
With the development of microgrid technologies, the impacts brought by distributed generation (DG) on the distribution network protection has not been improved effectively. Therefore, this article analyzed the fault characteristics of IBDG (inverter-based distributed generations) and that of microgrid composed by IBDG; built the simulation model of IBDG with P-Q control and that of IBDG with U-F control,...
The trend in Intermediate Bus Converter (IBC) is increasing output power demands and higher operating frequencies, while the appearance of GaN devices will improve the power density of the converter possibly. This paper analyzed the high frequency characteristics of GaN devices and its advantages at high frequency applications. Owing to difficulties in designing driver circuit and layout, the paper...
The work presented in this paper aims to propose a control strategy being able to extract efficiently energy from a fixed-pitch marine current turbine associated with a 5-phase Permanent Magnet Synchronous Generator (PMSG) in healthy mode and in faulty mode. The considered faults are opened phases. For each tidal current speed, the control strategy aims to extract the maximum power with respect of...
For the operation of autonomous microgrids, it is a major task to share the load demand economically. This paper proposes an economic operation method of microgrid for feeder power-flow optimization, taking into consideration the generation costs of the micro-sources and power loss in the transmission line. A detailed analysis of the cost-based nonlinear droop control scheme of micro-source inverter...
The loosely coupled transformer is the key component of a contactless power transmission (CPT) system. In order to reduce the size of the loosely coupled transformer, mixed winding arrangement containing planar winding and vertical winding is proposed in this paper. However, because of the using of the vertical winding, the proposed transformer has a large part of leakage flux at the back of the core,...
Conventional Wireless Power Transfer (WPT) has limitation due to the contradiction between the power transfer efficiency (PTE) and power transmission distance. A novel network called Wireless Power Transfer Network (WPTN) is proposed to help overcome the limitation, and power is efficiently transferred from a transfer node to a receive node via relay nodes over a relatively long transmission distance...
This paper details efficiency optimized operation and design of a bi-directional and isolated five-level Dual Active Bridge (5LDAB) converter for an application that requires ultra-wide voltage and power ranges. The rated power of the considered converter is 7.5kW, the specified input voltage range is 150V ≤ Vdc1 ≤ 800V and the output voltage is constant, Vdc2 = 700V. In order to achieve high efficiency...
This paper describes the design principles of damped proportional-resonant (PR) controllers used for the grid-connected inverters. Previous works focused on the frequency domain analysis to select parameters, which can't reflect the time domain performance directly. This paper presents a mathematical model of grid-connected inverter connected with a LC filter and isolation transformer in the stationary...
In order to improve output waveform quality of chain STATCOM by ladder wave modulation method, put forward to conduction Angle optimization method of total harmonic distortion rate (total harmonic distortion, THD) for direct optimization target, through the particle swarm optimization (particle swarm optimization, PSO) algorithm optimizing objective function of conduction Angle educed in this paper...
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