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A novel primary-side controlled universal-input ac–dc LED driver based on the source-driving control scheme is proposed in this paper, which employs low-voltage control <sc>mosfet</sc> $M_{2}$ to drive high-voltage power <sc>mosfet</sc> $M_{1}$ without an auxiliary winding commonly used in the conventional primary-side controlled scheme. The proposed control IC adopts minimum...
A bi-frequency PFM controlled boost DC-DC converter is designed and implemented in this paper to improve the electro-magnetic interference (EMI) and efficiency of the system in a wide load range. The spectral energy of proposed bi-frequency PFM controlled converter is distributed to more frequency points to decrease the discrete harmonic peak, achieving low EMI. A control IC for the boost converter...
This paper sets up a simplified model of microgrid, which consist of wind power, PV, energy storage and loads. The distributed sources in the microgrid are controlled using different strategies: PV and wind power are controlled in PQ control mode; while energy storage controlled in PQ mode during grid- connected operation, and in droop control mode when the microgrid is switched to the islanding operation...
This paper presents the results of a dynamic simulation of various scenarios of Electric Vehicle (EV) fast charging in combination with renewable generation. Based on a hypothetical distribution network, the possible benefits from coordinated controls of fast charging and renewable generation are studied under grid connection and islanding condition. For grid connection condition, strong and weak...
In a hybrid renewable power system, the use of a multiple-input dc/dc converter (MIC) leads to simpler circuit and lower cost, compared with the conventional use of several single-input converters. This paper focuses on the optimizing design of dual-input DC /DC converter. Different to single-input DC/DC converters, the parameters design of MIC is very complicated. This is because a MIC will operate...
From efficiency and reliability standpoints, there are three major issues in coal-fired power plant auxiliary systems: high in-house load, low power factor, and weak disturbance-ride-through capability. This paper presents a cost-effective solution to solve these problems. The proposed solution consists of Variable Frequency Drives (VFDs) with Active Rectifier Units (ARUs), mechanically switched shunt...
In order to solve the disadvantages caused by mechanical slide rheostat that they were big errors and low precision, a novel voltage regulation method for high voltage DC power supply was introduced. The key of this method were digital potentiometer Maxim 5455 and linear photoelectric coupling LOC110, and application programs were compiled using Visual Basic which was graphical compiling language,...
A design algorithm for grid-side LCL-filter of three-phase voltage source PWM rectifier is presented, which allows to use reduced values of inductance, improve system dynamic performance and reduce cost compared to traditional L-filter. These advantages are even more attractive in medium and high power applications. In this paper, the design criterion and calculation procedures are introduced in detail...
This paper presents the state of the art in the field of three-phase voltage source PWM rectifier with reduced input harmonics and unity power factor. The working principle, modeling procedure, corresponding control strategy as well as typical waveforms are introduced in detail which can provide some guidelines for engineers to analyze design and implement
This paper presents the state of the art in the field of three-phase voltage source PWM rectifier with reduced input harmonics and unity power factor. The working principle, modeling procedure, corresponding control strategy as well as typical waveforms are introduced in detail which can provide some guidelines for engineers to analyze design and implement
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