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The main purpose of this paper is to develop a DC voltage controller with AC power ripple compensation for single phase ACDC converter, which is served as the front-end converter for an energy storage system. Due to the single phase ACDC converter circuit topology, the AC and DC side both exist power ripple with doubled grid frequency. In conventional controller, DC voltage is controlled to be a constant...
We experimentally show the performance of a Virtual Infinite Capacitor (VIC) in suppressing the voltage ripple. VIC mainly uses a bi-directional DC-DC converter with only two small capacitors inside to mimic the filtering process of a large capacitor by applying suitable control algorithms. It was firstly proposed in [1], [2] and then improved in [3] in both control algorithms and circuit designs...
The increasing number of renewable energy sources and their integration into the medium voltage grid leads to an increasing interest in multilevel structures for the interfacing power electronic converters. A feasible topology for MV applications is the Stacked Multicell Converter (SMC) offering a modular structure and several voltage levels. A robust control, current limiting strategies under grid...
This paper presents an effective pulse width modulation algorithm for four-leg three-level Neutral-Point-Clamped Voltage Source Converters. The proposed method is based on natural coordinates abc and can be used in three-or four-leg converters. The algorithm is characterized by simplicity and the lack of a coordinate system transformation. The method was verified by simulations and experiments using...
The utility-scale renewables, PV and wind, are already approaching grid parity. To further enhance their penetration rapidly requires additional cost reduction and increased efficiency. There are other applications in utility-scale energy storage systems and in substations with power ratings in MW range for rapid charging of multiple electric vehicles. Towards this goal, one approach to interface...
This paper proposed a new Power Electronic Transformer (PET) topology in medium and high voltage application of 3-phase AC distribution network. In the proposed topology, diode clamped multilevel converter is used as the rectifier stage, and input series output parallel (ISOP) Dual Active Bridges are adopted for isolated voltage conversion. The proposed topology is suitable for medium and high voltage...
In recent years, significant progress has been made in HVDC transmission by the advent of voltage-source-converter (VSC) technology using modular multilevel converters. There is increasing demand to interconnect the existing HVDC lines into meshed HVDC grids for better renewable energy penetration. In this paper, a series of power electronic topologies, all based on the front-to-front VSC structure,...
In this paper a modified Zeta converter is proposed with replacement of conventional PI controller with fuzzy control for robust and reduced output stabilization time. The Zeta converter is one of the best PFC converters with very less DC voltage output ripple. The input is fed with a single phase AC source with maintained power factor at unity during the conversion process. The performance and analysis...
Integrated voltage regulators (IVRs) fabricated and positioned close to the microprocessors can improve the energy conversion efficiency, power density and the output voltage regulation performance compared to discrete VRs. The highest cost in terms of space and volume in such IVRs corresponds to the bulky passive components needed for their operation. In this paper, two different hybrid architectures...
The aim of this paper is the study and implementation of the start-up process of a shunt active compensators. This process is divided in two steps: the passive charging of the compensating capacitor accomplished by the inverse diodes of the compensator power inverter and the active charging of the capacitor, using the IGBTs. The second step can be implemented in many ways, with different ratios of...
This paper presents some key interactions among converters, which need to be taken into account when designing a modern embedded electrical grid, including a large amount of Power Electronics based loads. A design by Optimization method is first used to define the converter parameters. During this step, it is mandatory to account for the interaction between the input and output EMI filters. The second...
Now a day's power converters are very important in small power electronic devices like cell phones, laptop computers etc. due to its smaller size, light weight, high efficiency and high power density. This paper provides a comparative performance study of dc-dc CUK converter using different controller techniques such as PI controller and fuzzy logic controller. The state space averaging technique...
In this paper, a grid-connected battery charger is developed. The developed battery charger is composed of a power factor corrector and a buck converter. The power factor corrector control the input current to be sinusoidal and in phase with utility voltage to perform unity power factor. The buck power converter is step-down the output power of power factor corrector to charge the battery set in constant...
Requests for high quality and continuity of supply have led to the study of DC micro-grids. The realization of these networks would allow exploitation of DC advantages, but it would also create fault clearance and selectivity problems because semi-conductors suffer over-currents and over-voltages. The use of traditional DC circuit breakers is often not acceptable. As an alternative, static switches...
A future electrification scenario is envisaged where the energy demand from heat and transportation is supplied by electricity. In this scenario the current electricity network must adapt to prepare for high penetration levels of renewable energy sources and new energy applications, all connected to the MV and LV networks. This paper focuses on the associated LV network challenges, including roof-top...
In this paper, a single stage highly efficient photovoltaic grid interconnected charging infrastructure has been designed for off-board DC charging for electric vehicles. This paper starts with the design of a single phase H-bridge quasi-z-source inverter (qZSI), component design and the pulse width modulation technique used. Then it discusses the control techniques used to control the power flow...
A new AC/AC multilevel converter topology suitable for high power applications is presented. The proposed topology has less number of IGBT switches and capacitors compared with traditional approaches. In addition, more than half of the switches are operating in soft switching condition, which considerably decreases the switching losses. The theoretical calculations and simulation results are provided...
We address the extension of spatiotemporal marginal-cost-based Wholesale Transmission markets to Retail Distribution markets. We formulate the detailed Day Ahead (DA) distribution market clearing problem and solve it for real and reactive power Distribution Location-Marginal-Prices (DLMPs). Using a realistic industrial/commercial/residential distribution network, we obtain the DA market clearing DLMPs...
This paper presents a new and simple Finite Control Set Model Predictive Control (FCS-MPC) strategy of the Modular Multilevel Matrix Converter (M3C). This converter is one of the direct AC/AC power converters suitable for medium-voltage high-power machine drives with regenerative capacity. One of the main feature of this converter is that does not need external dc-voltage supplies and thus, all capacitor...
This paper presents a single-phase Hybrid Flying Dc-Source Active Neutral Point Clamped inverter, derived from the Hybrid Active Neutral Point Clamped/Flying Capacitor inverter. In order to validate the proposed concept, simulation studies and experimental measurements are presented. It is also shown the feasibility of application of the proposed inverter in single-phase isolated load PV systems.
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