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This paper proposes a new control method for two stage converters to realize the virtual synchronous generator (VSG) operation, which also can help eliminate circulating power between energy storage (ES) converters. It is proven in this paper that the proposed method shares stronger resemblances with synchronous generators (SGs) than traditional VSG in aspects of power conversion process and mathematical...
To improve the dynamic performance and the anti-disturbance capability of the photovoltaic energy storage system, a control strategy of the bidirectional DC-DC converter based on Linear Active Disturbance Rejection Control (LADRC) is proposed in this paper. Firstly, the mathematical model of the bidirectional DC-DC converter is established. And then, the double closed-loop control strategy based on...
Active ripple current reduction method is proposed for isolated DC/AC dual active bridge (DAB) converter to reduce the double grid frequency ripple in the DC current. Unlike those active methods that require extra switches to construct separate ripple reduction circuit, in this method, one or two branches of LC ripple steering circuits are used along with existing full bridge switches in a multiplexing...
In this paper, an efficient light emitting-diode (LED) lamp driver circuit for high power applications with a dimming feature is proposed. It consists of an LC series resonant converter in series with a DC bus. The idea is to supply the threshold voltage from a constant DC bus and control the voltage for regulating current with an LC series resonant converter. Since voltage responsible for current...
In this paper, the optimum operation of two winding single phase self-excited induction generator has been investigated with different capacitor topologies. The optimum values of the capacitors for different configurations are obtained using the genetic algorithm for optimum voltage regulation. The optimization is carried out under MATLAB where fsolve is used to find the magnetizing reactance and...
In this paper, the optimum operation of single winding single phase self-excited induction generator has been investigated with series and shunt capacitor configurations. The optimum capacitors values for different configurations are obtained using the genetic algorithm for optimum voltage regulation. The optimization is carried out under MATLAB where fsolve is used to find the magnetizing reactance...
Fuel-cell stacks are an attractive and efficiently way for power generation; however, its low and unregulated DC output voltage demands a DC-DC conversion stage to step-up the voltage to suitable levels. In this way, a transformerless boost converter with high step-up conversion ratios is proposed in this work to process the energy from a fuel-cell stack. This configuration is formed by two inductors,...
There are two unbalanced conditions for cascaded converter in Renewable Energy Source (RES) system. One is from the different output power of RES in bridge cells, and the other is grid voltage unbalanced fault. This paper presents a flexible voltage control technique of Modular Multilevel Cascaded Converter with single-delta bridge cells (MMCC-SDBC) in the RES system for maintaining the stable operation...
In this paper, new method for generating motor current references is proposed in motor drive systems with single-phase diode rectifier and small dc-link capacitor in order to reduce the amount of the motor currents. Unlike the conventional large dc-link capacitor, small dc-link capacitor cannot work as an energy buffer. Therefore the motor currents, d and q-axis currents in synchronous reference frame,...
An important trend is the use of plug and play microinverters attached to the PV panel, allowing the so called AC module. However, these converters are subjected to high temperature and humidity. Thus, in order to improve reliability and achieve long lifetime, this work proposes a new topology that provides inductive power decoupling and eliminates electrolytic and even film capacitors, using a single...
In this paper, a new operation strategy for switched capacitor converters is presented. This operation mode increases the converter efficiency throughout all the load range, including heavy and light load conditions. The efficiency is increased by adjusting the switching frequency, based on the analysis of the power loss model. In order to support this concept, theoretical analysis and experimental...
In this paper a power conditioning system based on a modular connection of Z-Source DC-DC converters is presented. The proposed structure presents advantages such as modularity, high voltage gain, and multiple independently controlled input terminals. All these make it suitable for application in PV power plants, especially in cases where large arrays are required in which having the ability of independently...
This paper proposes an analytical, closed-form multi-sine AC-DC voltage multiplier model and investigates the dependency of input and output power on circuit and device parameters. Comparisons of the proposed model with SPICE simulation results are also provided for validation under various circuit parameters, such as the number of stages and capacitance per stage, and device parameters such as saturation...
In this paper the virtual synchronization control strategy is applied to MMC based VSC-HVDC system to improve the performances of stable state and dynamic state. The small signal model of the virtual synchronization controller is built to show the performance when the system is subjected to small interferes. Then the characteristics of the system in different operation state are analyzed. As the virtual...
This paper presents a two-output three-level inverter (a TOTL inverter) by using phase-shifted pulse-width modulation (PSPWM) to achieve the symmetrical output waveforms. A TOTL inverter is made of 3-legs of neutral point clamped inverter [1] which can provide two-output per one circuit. This is a concept to reduce a size and a number of components when it is compared with one output per one circuit...
This article proposes a robust controller design of hydro-thermal power system considering of the thermal power plant area connected to the hydro power plant area. The automation generation control of an interconnected hydro-thermal power system with a small Energy Capacitor System (ECS) augmented to both area has been investigated. The controller is used in order to control the frequency robustly...
Conventional single phase DC/AC converters require a large amount of electrolytic capacitors to absorb the pulsating power on DC bus. Power decoupling technologies are very effective in reducing the capacitance and hence improve the reliability. This paper introduces three kinds of decoupling circuits, compares their filter capacitor sizing by performing detailed power flow and storage energy analysis...
Conventionally, both the primary side and the pickup side need series or shunt capacitor compensation to increase transmission efficiency in a wireless power transfer system. In this paper, a wireless power transfer system with an active resonance circuit is proposed. Comparing the diode based rectifier on the pickup side in traditional wireless power transfer systems, a PWM rectifier is exploited...
The power transfer restrictions on the transmission lines 150 kV in Sumatera Interconnection System caused electric power generated by the power plant with lower cost in fuel at Southern Sumatera cannot be optimally delivered to the load centers in Northern Sumatra. One of technical solution that is expected to solve this problem is fixed series capacitor installation in tie line Lubuk Linggau — Bangko...
In the BEV (Battery Electric Vehicles) charging station, each charger is equivalent to the whole system of a subsystem. The interaction among the BEV chargers is likely to deteriorate the stability and dynamical performance of the whole charging system, even making the system unstable. The research on input impedance characteristics of BEV charger is very important in the stability estimation for...
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