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Current-mode control is frequently used in dc-dc buck converters. Many current-mode buck converters apply type-II compensators for obtaining high loop gain to reduce the steady-state error and maintaining the loop stability with restricted bandwidth. However, when large load-current transients occur, significant transient undershoot/overshoot is generated due to the restricted loop bandwidth. In response,...
A fuzzy control strategy is presented to implement the neutral-point (NP) potential balance based on the power stage of three-level Boost dc-dc converter in this paper. The presented fuzzy controller can solve the imbalance problem of NP potential in the process of starting up and can suppress the influence of inverter circuit modulation strategy on NP potential. It is the fuzzy controller that can...
This paper analyzes the necessity of establishing the dc bus voltage of the Dual Active Bridge (Dual Active Bridge, DAB) converter when starting up. And the startup method that the DC-bus voltage is built up only by high-voltage-side body diode of the DAB converter rectifying is proposed in the paper. The detailed steps and the software realization method are elaborated. The saturation phenomenon...
The reason why the neutral point (NP) voltage unbalance is analyzed in detail and a Fuzzy Controller based on control index proposed. This way to balance the NP voltage is simple and need not extra hardware cost. Fuzzy controller can automatically and intelligently adapt the value of the control index and change the operation time duration of the small vectors. The Fuzzy controller design has been...
The reason why the neutral point voltage fluctuates is analyzed in detail and a current-sensorless hysteresis control strategy proposed. This way to balance the neutral-point voltage is simple and not need of current sensor. Based on small signal control model and neutral-point voltage balanced technique the experimental prototype are given and the experimental results verify that the proposed mathematic...
The control strategy for three-phase-high-power-factor PWM rectifier is studied, and the methodology of building the small signal model of the main power circuit is proposed in this paper. High frequency model for the rectifier mentioned and the input-to-output transfer function for the system are deduced with analysis. Design principle and method of the voltage regulator are given based on the model...
A three-phase PWM bidirectional converter system based on line voltage oriented vector control is researched. A novel on line voltage oriented vector control without line voltage sensing is proposed. The system is operated with unit power factor in the side of AC line no matter in rectifier mode or active inverter mode. The alpha and beta components of line voltage were estimated by the line current,...
A predictive current control for three-phase PWM rectifiers is proposed to simplify the design of the current loop with less memory and interrupt resource occupation in a digital signal processor. Together with the decomposition-matrix method, the total algorithm can be completed with only one timer and its underflow interrupt subroutine. The predictive current controller helps to design the voltage...
Novel control for an input-series and output-parallel dual two-transistor forward converter (ISOP-DTTFC) is proposed, based the novel analysis and result on the input voltages unbalance. With peak current control, the sampled error voltage between the input capacitors is introduced directly to the PWM pulse generation circuit and both the output voltage and input-voltage-sharing are controlled. Then...
A predictive current controller applied in a three-phase PWM rectifier is proposed. It can simplify the design of the current control loop and occupies less memory and interrupt resource in the DSP (digital signal processor). Together with the decomposition-matrix method, the total algorithm can be completed only with one timer and its underflow interrupt subroutine. The predictive current controller...
Numerical simulation methodology based on high frequency mathematical model of high power factor PWM rectifier is proposed in this paper. And input to output transform function is deduced. With the help of input to output transform function, the design method of voltage regulator has been presented. The simulation for three-phase PWM rectifier is implemented with Runge-Kutta, thus comprehensive simulation...
Inner current loop modeling of a resonant DC link inverter, soft switching combination inverter, which works in current controlled three state discrete pulse modulation mode, is proposed. The modeling method is valid for double loop feedback controlled inverters which works in other modulation mode. Equivalent analytic model is established and used for voltage regulator design. Example are given in...
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