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In this paper, the already proposed high feedback gain switching method has the optimum setting for a specific load step. Therefore, we investigate the optimal setting of the proportional gain switching for various disturbance such as the line and load fluctuation, which could occur in the renewable energy system. As a result, the following setting of the proposed method is optimum: the optimum setting...
A model control and a filter suppressing oscillation of the output voltage that can obtain the stable output voltage of a dc-dc converter have been proposed previous. Although there is a problem that the condition on the input side of dc-dc converter is changed when it connects the load equipment to renewable energy generators through the DC bus, since the renewable energy generators are sometimes...
The purpose of this paper is to present a design of digital hysteresis current control circuit in ac-dc converter for wind power generation. The control circuit utilizes a digital signal processor and an analog reactor current detector using an RC integrator. In the proposed method, the design of time constant of RC integrator is important to determine the operation range of duty ratio. The design...
This study presents a sensorless static model based with output current estimation method for digital PWM control dc-dc converters. The static model is a feedforward type control method adopted in coordination with the standard PID control and it can improve characteristics of wide input and output range of dc-dc converter by using information of output current. The one of the drawbacks of the static...
The purpose of this paper is to improve dynamic characteristics of dc-dc converters in the information and telecommunications system by using a proportional and integral gain changeable control method. Generally, stability becomes worse and a limit cycle oscillation occurs when large PID control gains are used. In the proposed method, the proportional gain is risen during a transient state to improve...
One of the important role for dc-dc converters is to regulate output voltage against the transient variation of input voltage. Recently, renewable energy becomes popular and renewable power generators are connected to the dc power grid directly, dc bus voltage is affected from them. Therefore, the improvement of the transient response against the variation of the dc bus voltage is required to control...
The digital control has the attractive capability, for instance, the high-performance function and the energy management capability. On the other hand, there are issues which must be solved for the actual implementation. The proposed method can solve some of them, namely the transient response, the dynamic characteristics and the precision of the controller, with the simple method.
This paper discussed the regulation characteristics of boundary conduction mode PFC converter with a novel zero-crossing point detector. In the conventional method, the zero-crossing point is detected by observing the change of inductor voltage. The detection of zero-crossing point is delayed due to the effect of parasitic capacitors in the main components of PFC converter. The proposed detector can...
We have proposed the sensorless model control based on the static model equation of the dc-dc converter that is able to change the bias value corresponding to changes of the load current, the input voltage and output voltage. The sensorless model control can regulate the output voltage. On the other hand, the transient response of output voltage is not improved. Therefore, an improvement of the transient...
This paper studies about computational burden of a reference modified PID with a neural network prediction for dc-dc converters. Flexible control methods are required to realize a superior transient response since the converter has a nonlinear behavior. However, the computational burden becomes a problem to implement the control to computation devices. In this paper, the neural network is adopted...
In this paper, a new digital hysteresis current control for ac-dc converters is presented. The new control circuit has the peak and valley current detectors which are comprised of an RC integrator, comparator and R-S flip-flop. These current detectors can detect the peak and valley reactor currents in real time. The proposed control circuit structure and the operation principle are explained with...
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...
Switching power converters connected to dc loads need high stability because the dc bus voltage is fluctuated in the hybrid energy system. The aim of this paper is to present stability characteristics of a digital peak current control dc-dc converter regarding input voltage fluctuation. The proposed method shows higher stability than the digital voltage mode control method even though the input voltage...
The purpose of this paper is to analyze the dynamic characteristics of proposed digital peak current mode dc-dc converter. The waveforms of the output voltage and the reactor current are derived by the small signal analysis. They are compared with simulation results assuming an actual large amplitude operation. It is confirmed that the tendency of the transient response is indicated based on the analysis...
The aim of this paper is to present a superior transient response of a digital peak current mode dc-dc converter in order to address input voltage fluctuation. In the dc power feeding system, a quick response is important for not only load fluctuation but also input voltage fluctuation. Since the proposed peak current mode control method can detect the peak current in real time, the transient response...
The dc power feeding system has been attracted attention in recent years. Since the load is dynamically changed in this system, the stability of dc-dc converter is important. This paper presents the stability analysis and the transient response of digital integral gain changeable control dc-dc converter using small output capacitance. The proposed method changes the integral gain with a single logarithm...
This paper presents a reference modification model digitally controlled dc–dc converter. The proposed method is able to obtain superior transient response because it modifies a reference of conventional feedback loop against the change of output voltage. The modifying process operates only in the transient state. During the steady state, the feedforward control cancels a steady-state-error. Since...
This paper studies a new digital hysteresis current control to provide high stability power converters. Although the output voltage is sensed by an A-D converter to calculate the digital feedback value, the reactor current is detected by peak and valley current detectors which consist of some analog circuit components. Therefore, the proposed method realizes the real time detection of reactor current...
In this paper, we present a feedback gain changing dc-dc converter. The proposed method corresponds to the input voltage variation because the integral gain is determined in consideration of it. Generally, a quick transient response cannot be obtained when the proportional gain is small. On the other hand, when the proportional gain is set to a large value, the transient response is improved. However,...
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