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The three-phase boost inverter is a differential inverter topology which can provide both boosting and inversion functions in a single power processing stage. If the switching frequency ripple current component is ignored, the DC side current of the three-phase boost inverter contains only a DC component when all three converter legs are identical. However, the capacitance values of the output capacitors...
Achieving a high-level of stability represents one major concern in autonomous microgrids (MGs) with high penetration levels of renewable energy sources. The aim of this paper is to study how photovoltaic (PV) power plants can provide dynamic frequency support in an MG, in order to obtain an improved stability for the entire power system. On the PV side an energy storage subsystem is added, which...
A hybrid distributed generation system (HDGS) using a multi-input multi-output positive buck-boost converter (MIMO-PBBC) is proposed for the supply-side of the grid-connected photovoltaic (PV) generation power plant, where three PV clusters, one battery bank, and one supercapacitor module are hybridized and regulated by a centralized three-phase dc-ac inverter with their corresponding control systems...
In the currently predominant AC-Grid, energy reserves are provided by the inertia of rotating synchronous generators. In a potential DC-Grid, there is no such inherent energy reserve and thus additional energy storage (ES) is required to ensure grid stability. The Modular Multilevel Converter (MMC) is an emerging technology for HVDC-Grid applications and offers a convenient way of connecting ES to...
Three phase ac drives using a dc link typically feature a significant amount of dc energy storage to maintain a stiff dc bus. This paper examines the concept of reducing the size of the dc link capacitor dramatically, to store just enough energy to provide one high frequency switching cycle of output power. The dc bus is no longer stiff and hence the classical sinusoidal pulse width modulation cannot...
An AC microgrid system model is created to assess transient and steady state stability during periods of separation from the grid. A secondary control is constructed to dispatch energy sources according to user selected setpoints and participation factors. Two sources — an energy storage device and synchronous generator — are controlled to share active and reactive load burdens. A system load models...
Use of renewable sources of energy for charging of electric vehicle(EV) batteries have generated tremendous interest. The use of off-board DC chargers to reduce the weight and increase space inside an electric vehicles has been an important area of interest. Harvesting solar energy to charge electric vehicle batteries can result in large inefficient systems when multiple power conversion stages are...
In the case of a wide-scale adoption of grid-connected Photovoltaic (PV) systems, more fluctuated power will be injected into the grid due to the intermittency of solar PV energy. A sudden change in the PV power can potentially induce grid voltage fluctuations, and thus challenge the stability of the grid. Hence, this sudden active power change resulting in a large power ramp-rate should be avoided...
Many efforts have been made to improve the single-phase power converters with active capacitive DC-link. The purpose is to reduce the overall DC-link energy storage and to achieve a reliable and cost-effective capacitive DC-link solution. A few review papers have already discussed the existing capacitive DC-link solutions, but important aspects of the topology assessment, such as the total energy...
This paper proposes the concept of integrating the energy storage within a Medium Voltage to Low Voltage solid state substation in order to provide new features compatible with the requirements from future more intelligent grids. The principles for the system development are presented and the role of each subsystem is explained. The experimental evaluation of the 1.9kVrms/25kVA substation with 1.5MJ...
Research on energy management strategy is particularly important in the microgrid operation, especially in the isolated island operation state caused by external power grid fault or power quality unsatisfied with the requirements. Due to the uncertain of wind power and photovoltaic power output and deviation in load forecasting, it will make the energy storage unit of microgrid in islanded state frequently...
Increased integration of distributed energy resources (DER) depends on addressing a number of technical challenges, both on the planning side—the interconnection process—and likewise how the DER interacts with distribution operations. These two domains are obviously linked. This paper presents the results of the first phase of a project considering the testing and demonstration of DER and a real-time...
A modular bidirectional current-fed three-phase 6-pack inverter is proposed to integrate the low-voltage high-current source, i.e., solar, fuel cells, storage, or low voltage dc grid to interface to ac grid or load. The 3-phase 6-switch or 3-leg module can be employed with dedicated driver board to design and develop the converter for high power application. It offers scalability and reliability....
Battery energy storage system(BESS) connected to the grid by power conversion system(PCS). Currently Cascaded Multilevel Converter(CMC) and Modular Multilevel Converter (MMC) are two more advanced topologies for PCS. This paper compares CMC and MMC topologies in aspects of efficiency, harmonic characteristics, reliability, control system complexity and cost, the simulation results are presented. Suggestions...
In this paper, a new coordination photovoltaic/battery micro-grid control strategy is proposed to improve the micro-grid fault ride-through capability. Under normal condition, the proposed strategy can restrain the influence of load fluctuations. When symmetrical grid fault happens, the micro-grid can ride through it by the proposed strategy. The DC-link bus voltage and AC current could be kept stable...
One of the major issues in a single phase inverter topology is the 120Hz ripple which needs large decoupling capacitors. Big bulky electrolytic capacitors can be an issue in applications where compact size and high power density are requirements such as solar converter chargers. In z source inverter systems, the design of the impedance network is critical. In single phase z source inverter systems,...
This paper presents a novel approach to the modeling and control of AC microgrids that contain spinning machines, power electronic inverters and energy storage devices. The inverters in the system can adjust their frequencies and power angles very quickly, so the modeling focuses on establishing a common references frequency and angle in the microgrid based on the spinning machines. From this dynamic...
This contribution presents a smart power electronics injection system for grid-connected photovoltaic energy resources. The developed converter can not only inject the maximum active power as a typical inverter does, but also provide the active functions the Smart Grid scenario needs, including reactive power reference tracking for compensating purposes, node voltage regulation for helping the grid...
Multilevel power converters are typically developed for high power applications such as AC drives, energy storage systems, active power filters and compensators. A number of multilevel topologies proposed for these applications. Each topology possesses its own advantages and disadvantages and is used in particular area depending on the system requirement. This paper presents a topology of a hybrid...
A hydrokinetic smart grid (KSG) concept powered by modules of hydrokinetic microturbines arranged in rows is proposed in this work. A complete description of each module: mechanical design, hydropower characteristics, power electronics and control strategies have been included. A complete dynamic simulation of an example of a KSG has been performed. It considers microturbine modules, power loads,...
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