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This paper proposes a digital online efficiency optimization technique for DC/DC Dual Half-Bridge Series Resonant Converters. The proposed technique implements an advanced modulation scheme which exploits the degrees of freedom inherently available in the converter modulation space in order to simultaneously regulate the output voltage and maintain the system in its maximum efficiency point. Furthermore,...
In this paper, an autonomous photovoltaic (PV) power generation/storage system connected to an AC nonlinear load is investigated. Depending on the load demand, the PV output power and the battery condition, five modes of operation are feasible with the changing load power. The steady-state analysis of the system for the entire operating modes is presented. Based on the concept of controllability sensitivity,...
In this paper, it is shown that in the three-phase six-switch boost PFC rectifier with average-current control and unbalanced input-voltage and/or input-current sensing gains, the current controller with proportional (P) compensation exhibits lower total harmonic distortion (THD) and higher power factor (PF) compared with that of proportional and integral (PI) compensation. It is also shown that the...
This paper is focused on the assessment of a modular architecture based on the Dual Active Bridge (DAB) converter in input series, output parallel (ISOP) connection. Previous works have dealt with modeling and control techniques to ensure a proper voltage and power sharing among the modules. In this paper an experimental evaluation of the behavior of the DAB in ISOP connection is carried out in order...
This paper presents a decoupled and adaptive droop strategy to coordinate parallel operation of inverters. This strategy neatly combines a novel decouple method and an adaptive power sharing strategy. The decouple method guarantees the system stability by defining a pair of virtual power and utilizing a low pass filter to achieve dynamic decoupling. And the adaptive power sharing method is included...
The control of boost converters using traditional linear techniques features fixed switching frequency and a simple implementation. Due to its characteristic non-minimum phase behaviour, the dynamic response can be improved only to a limited extent. On the other hand, excellent dynamic performance can be achieved with boundary controllers in which the demands placed on processors and sensors are greatly...
A grid-tie solar inverter with capacitor-supported series voltage compensator for reduction of high-voltage dc-link capacitance is proposed in this paper. The series compensator generates a voltage to counteract the voltage ripple on dc-link capacitor. As the magnitude of the AC voltage ripple is smaller than the dc-link DC voltage, the required voltage-current rating of the compensator is small....
Modular Multilevel Converter (MMC) is a promising topology for high voltage/power AC/DC and DC/AC applications. Model Predictive Control (MPC) is an advanced and simple method for power converters control. However, its computational load becomes unacceptable when MMC voltage level increases. An improved MPC for MMC is proposed in the paper. The submodule capacitor voltages are sorted according to...
A distributed control scheme, based on feedback linearization, is proposed for proper current sharing in parallel Cúk converters. Compared to the conventional master-slave control method used in parallel converters, the proposed distributed scheme enjoys modularity, improved reliability, and more design flexibility; it also eliminates the necessity for a central master controller. The nonlinear state-space...
Datacenter power consumption makes up two percent of United States electricity consumption or 80TWhr. Roughly half of this energy is spent on cooling or lost in power conversion. Further as datacenters try to maximize compaction, the need for small and highly efficient power supplies is highlighted. Telecom power supplies often rely on large and lossy transformers to achieve large conversion ratios...
This paper concentrates on the load disturbance in three-phase voltage source inverter with an output transformer. The transformer could be smaller when placed behind the LC filter. But the voltage drop on the leakage impedance of transformer may destroy the quality of output voltage. Output current feedforward control is proposed to eliminate the influence of load disturbance. The distinct features...
This paper introduces a fast closed-loop control strategy for a pulse width and amplitude modulation (PWAM) boost-converter-inverter system for HEV/EV motor drives. The PWAM boost-converter-inverter system, in which the dc-link voltage is controlled to have a 6ω fluctuation following the output peak voltage envelop, provides several advantages over the traditional PWM boost-converter-inverter system,...
This paper presents a dual-loop inverter voltage control strategy for uninterruptible power supply (UPS) utilizing an one-step ahead model predictive control in the inner-loop. The proposed MPC optimizes the cost function of the error state through a simple online membership test; any numerical method is not necessary. Moreover, any off-line optimization is not required. It is shown that the proposed...
This paper proposes a design of an on-chip coupled power inductor (OCPI) structure which consists of a layer of ferrite core material and another layer of coupled spiral windings on a silicon substrate. The flux cancellation effect of the two inversely coupled windings significantly reduces the net fluxes in the ferrite layer, which helps increasing the saturation current of the power inductor. An...
A distributed cooperative control method for load sharing of parallel converters is proposed. Using consensus-voting protocols, the need for a master converter or a central controller is eliminated. The proposed modular structure does not require a priori knowledge of the number of active converters, which makes it a viable option for plug-and-play operational framework. Moreover, additional links...
The conventional droop control method, which does not require communication lines, is an effective control scheme to dispatch power among inverters in the microgrid. However, this method has inherent tradeoffs: frequency vs. active power accuracy and amplitude regulation vs. reactive power sharing accuracy. To cope with this problem, this paper presents a novel active power control strategy to improve...
The characteristic parameters of micro-grid determine its transient response and stability. Due to uncertain load changes as well as large-scale intermittent energy accesses, the micro-grid systems are always subjected to large number of random disturbances which results in micro-grid structure parameters change. To solve this problem, this paper presents a novel model for characteristic parameters...
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