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Smart grid systems include many different power sources such as renewable and fossil energy basis. While collecting all type of energy on the grid, phase order, frequency, maximum voltage value and synchronization time of each power station should be known for a smooth operation of the smart grid. Therefore, the detection of peak values of grid voltages will help the smart grid operators to connect...
In this paper, the application of genetic algorithm (GA) to energy management of isolated power system is discussed. A method to realize the simultaneous optimization of configuration and operation with emergency generators (EGs) in a hospital is proposed as an example. The simultaneous optimization of configuration and operation needs search of enormous combinations, which is generally considered...
The boost type dc-dc converter is used for compensation of dc bus voltage in the dc power feeding system such as the renewable energy system. It should be operated stably to improve reliability of the system. The peak current mode control is applied to operate stably because the boost type dc-dc converter tends to be unstable. However, a peak value of reactor current cannot be captured in the digital...
The renewable energy has been attracted attention as a solution of global warming because it can suppress the carbon dioxide emissions. The renewable energy should be optimized by the energy management in the renewable energy system. The digital peak current mode control dc-dc converter is presented to realize the stable operation in this system considering the variation of the input voltage condition...
The boost type dc-dc converter is widely used for providing the stable power to the load in the renewable energy system. This paper presents the integral gain switchover digital control boost converter to improve regulation characteristics and the transient response in the light load condition. The proposed method switches the integral gain between the continuous conduction mode (CCM) and DCM by the...
The purpose of this paper is to present a influences of parameter deviations on operation of a novel current sensorless AC-DC converter are discussed. The off time is calculated based on the equations of each operating state for boundary current control mode. The relationship among the THD, power factor and efficiency, and circuit parameter errors are discussed. When the circuit parameter varies from...
The purpose of this paper is to present an integral gain changeable digital control dc-dc converter for the wide input and load regulation. The integral gain is switched by an average reactor current value, and its value is determined using the stabilization range of output voltage based on the integral control. Therefore, the proposed method can obtain good regulation characteristics in any input...
This paper presents a new digital load-dependent soft-start method of dc-dc converter for energy management system. The soft-start operation is used to prevent negative effects for a power supply. In the conventional soft-start operation, the dc-dc converter must start up very slowly to deal with the worst load condition. It takes long time to start up a power supply. The proposed digital control...
This paper presents the digital control method for the wide transient range dc-dc converter. We have already reported that an exponential function model is effective in improvement of transient characteristic. There is a problem that calculation time is long by using the exponential function and the square root. In this paper, those functions are approximated in order to achieve the calculation time...
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