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Parallel connected distributed generation with energy storage systems (ESSs) are popular in modern sustainable microgrids. Absence of proper coordination between ESSs can lead to reduced system lifespan due to unnecessary deep discharge or premature fully charged of individual battery. This paper proposes an energy management strategy aimed at elimination of this problem by balancing the state-of-charge...
The development of the thermoelectric (TE) power generation is rapidly conducted as well as the application areas are increasingly. Its principle is based on the Seebeck effect that uses the temperature difference between the hot side and cool side of the thermoelectric generator (TEG) to convert thermal energy to electrical energy. A new design proposed here is to convert the waste heat from a motor...
Doubly-fed induction generator (DFIG) is the most common type of generators for wind power generation, because of their high energy yield and the possibility of generating power at variable speeds. For most papers in literature, only the synchronization and power generation of DFIGs, but not the transition between them, are discussed. This paper presents a method to control the transition of DFIGs...
Active power filter is an advanced power electronic device, which can be used for integrated compensating harmonics and improving power quality. A shunt active power filter using for three-phase four-wire system is introduced in this paper. The basic operation principles and structure are analyzed. This paper proposes the design of a shunt active power filter, which can be used under the condition...
To provide a test facility for possible demonstrations of advanced distributed generation system integration strategies, a single-phase laboratory-scale Microgrid system is set up. Two distributed generators are included in this microgrid, a photovoltaic simulator and a wind turbine simulator. Both of them are connected to the AC grid via flexible power electronic interface respectively. For stable...
A novel single-phase voltage sag restorer with diode-clamped multilevel bridge is presented. In the proposed circuit, traditional two-level half bridge inverter is replaced by multilevel diode-clamped inverter, in which the DC-bus voltage is split into several levels by series-connected bulk capacitors. Although the multilevel circuit has more component count than the two-level circuit it is more...
This paper first introduces the topology of three-phase PWM voltage source rectifier (VSR). Then the mathematical models in three-phase static and two-phase rotary coordinate system are built. Based on that theory and the voltage-oriented vector control's idea, the paper introduces a dual-channel closed-loop control strategy with current-inner-loop and voltage-outer-loop. Active power channel is aim...
This paper presents a motor drive circuit that is to provide motion control for DC motor which is designed to connect the computer's series port with the CAN fieldbus. The principles of design and the program flow chat are also introduced. The interfacing to the motor drive system is described. The system shows the control and configuration of the motor drive using H-bridge system and the CAN bus...
High-intensity discharge (HID) lamps are becoming popular substitutes for halogen lamps in automotive headlamps because of the high lumen/watt ratio and the color of the light. In this paper, a ballast (integrated with a voltage multiplier circuit in the secondary winding of the dc converter transformer) with dimming control is presented. The proposed circuit not only eliminates one auxiliary winding...
It is the purpose of this paper to explore the problem of dimming the HID lamp used in the automotive headlight system. To investigate the relationship between the lamp power and control parameters, a power-dependent HID lamp model is established in this paper. The two methods, dynamic duty-ratio control and dynamic bus voltage control, are analyze and applied in the system. The dynamic bus voltage...
This paper presents a control scheme to implement the energy-savings of three-phase induction motors when they operate under long-term light-load or small duty ratio load. The proposed scheme is based on the principle of variable voltage control (VVC) at constant speed. The energy-saving controller for three-phase induction motors is developed. A group of the experiments demonstrate that the proposed...
There are two most important technologies in this century, one is biomedicine and the other is energy technology. Energy issue produced problems or adverse effects in different levels of industry or in living. The Global warming also arouse the awareness of the public in energy saving. Therefore new energy saving technologies are appearing and developing rapidly, at the same time energy regeneration...
This paper examines the H-bridge converter using passivity based control. The nonlinearity of resonant type H-bridge converter is poor and therefore the dynamic performance of the converter is weak. Using simple PI control, the transient response is not satisfactory. The passivity based control is first derived for the H-bridge converter. The parameter estimation is examined and the comparison with...
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