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This paper proposes the class-E rectifier with harmonic-current injection. For injecting the harmonic current, a harmonic-component resonant circuit is added to the class-E rectifier. By injecting the harmonic current with proper amplitude and phase, the peak value of the diode voltage and current can be reduced effectively. This paper shows the design example along with the experimental results....
This paper proposes an implementation of an on-line maximum efficiency control for matrix-converter based IPMSM drive systems. A simplified efficiency model of the drive system is established first; as a result, the detailed model of the inverter loss and motor loss is not required. Next, by on-line searching the maximum efficiency operating point, the efficiency of the whole drive system can be significantly...
Recently, a novel hybrid multilevel inverter topology, the EDA5, was presented. The novel inverter topology comprises of two floating capacitors and 16 active switches to achieve five-level output voltage waveform and achieves higher efficiency at low-modulation index compared to a five-level Active Neural Point Clamped (5L-ANPC) converter. In this work, a full SiC MOSFET version of the inverter is...
This paper proposes a power-circulating operation at light load operation for a parallelly-connected dual-active-bridge (DAB) converter in order to achieve zero voltage switching (ZVS) over entire load range and wide battery-voltage variation. At the light load, a power flow of each DAB converter is controlled in such a way that the transferred power of each DAB converter satisfies the condition for...
The electrical characteristics of a power system connected with a high-capacity offshore wind farm (OWF) can be significantly varied under various wind-speed conditions. This paper demonstrates voltage variations at the point of common coupling (PCC) when a high-capacity OWF is connected to different buses of the neighboring onshore substation of Taiwan Power System (TPS) through three or two submarine...
The transient-response simulation results of Taiwan Power System whose power grid is connected with a high-capacity offshore wind farm (OWF) of 100 MW subject to symmetrical and unsymmetrical severe disturbances using a commercial power-system simulation software are presented in this paper. A three-phase short-circuit fault is suddenly applied to the collector bus and power grid of the studied power...
This paper proposes a design method of the wireless power transfer system which obtains high power and high efficiency by using LC filter circuit in the transmitting side. This study forcuses on the maximum efficiency point of impedance. In the simulation, the proposed design achieved 2.5kW output power with the efficiency of 73%. In the experiment, the proposed circuit achieved 1.8kW wireless power...
This paper presents a new non-isolated dual-input dc-dc converter. The proposed converter can transfer energy from different input sources to the output load individually and simultaneously. In addition, by operating in the step-up/down mode, the input voltages can be higher or lower than the output voltage which leads to a wide input voltage range. This feature is suitable for renewable energy systems...
This paper presents two configurations of dual-input (DI) or three-port (TPC) isolated dc-dc converters for hybrid renewable energy systems such as photovoltaics and batteries. These two converters are derived by integrating an interleaved boost converter and a single-active bridge converter with an ac inductor as a power interfacing element or phase-shift soft-switching converter with an output dc...
The intermittency of solar photovoltaic (PV) power generation causes problems to the grid, especially for the islands or weak grids. The utilities have imposed ramp limitations in some countries or regions, such as Germany, Puerto Rico, Ireland, Hawaii, etc. There are three ways to achieve power ramp-rate control (PRRC), one is by using energy storage system (ESS), the second is active power curtailment,...
This paper proposes an adaptive mixed game control algorithm to realize optimal load planning in cell sites forming a microgrid powered by renewable sources. Cell site controllers use renewable sources power generation and local load predictions to plan future coordinated load management, renewable power generation and local energy storage. Mixed game methods have been proved to offer an adequate...
In addition to random power fluctuation, the unpredictable high ramp rate is another uncertainty of Photovoltaic (PV) power output. It increases the requirement of both the amount and response speed of operation reserves at different time scale in the grid. The fast fluctuation of PV needs to be compensated by frequent ramp up and down reserves. Traditional generators will face heavy wear and tear...
Ultracapacitor-based energy storage systems can be used for the compensation of power deficiency in renewable power generation, and for energy saving in the utilization of electrical power. Two such cases will be considered in this work: the photovoltaic (PV) power plant, and the electric bus. Variable nature of solar irradiation owing to local meteorological and environmental conditions, makes it...
This paper presents the optimal management and designing method for a novel renewable energy system (RES) consisting of photovoltaic (PV), wind generator (WG), battery energy storage system (BESS), fuel cell (FC), and seawater electrolysis plant, 100% renewable energy power system, in remote island in Japan. Furthermore, the real-time pricing (RTP) is applied to the power system to restrain the output...
The introduction amount of renewable energy has increased, but control of power system is getting harder. As a solution of this problem, the use of an off-grid smart house that is not connected to the electric power system. The off-grid smart house can freely introduce renewable energy generation equipments. Also, it can operate without emission of carbon dioxide. In recent years, attention has been...
The latest trend in solar inverter application is to increase DC link voltage to 1500VDC for high power output. This paper describes a design concept of NPC1 power stack for 1500VDC megawatt level solar inverter. This stack uses three latest half-bridge IGBT modules with highest power density and operation junction temperature, which enable realization of power level beyond 1MW without paralleling...
For traditional AC/DC power factor correction (PFC) converters, the diode bridge rectifier is needed in the front-end. While a large current flowing through the bridge, the conduction voltage drop of diodes can result in large power loss. Bridgeless converter can be adopted to improve efficiency and bipolar gain property makes the function of PFC realizable. In this paper, an isolated PFC converter...
This paper proposes a frequency regulation strategy applied to wind turbine generators (WTGs) in an isolated grid. In order to complement active power shortage caused by sudden load or wind speed change, an improved deloading method is proposed to solve inconsistent regulation capabilities in different speed regions and provide WTGs a certain capacity of power reserves. Considering the torque compensation...
With the popularization and application of microgrid projects, the multi-microgrids (MMGs) with three-phase / single-phase (TP/SP) architecture is formed in a plurality of adjacent microgrids with certain needs. Due to the complexity of the topology and the diversity of the power supply modes, the MMGs can operate in various modes. It is an urgent problem to realize the flexible seamless switching...
In islanding microgrid, the distributed generation (DG) units should take over the microgrid and meet the power demand of loads. Due to the randomness and capacity limitation of DG units, the islanding microgrid may face overload challenge with load increasing. The islanding microgrid need massive energy storage system for power reserve or load shedding to maintain microgrid stable. However, this...
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