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In this paper, a cyclic repetitive control (CYRC) scheme is developed and applied to a constant-voltage constant-frequency (CVCF) pulse width modulation (PWM) converter to achieve high tracking accuracy with less consumption of memory space. In this scheme, a novel cyclic sampling strategy is adopted by a down-sampled repetitive controller. The cyclic sampling strategy, which shifts the sampling points...
This paper presents a H∞ loop-shaping controller for regulating the switching signal of the inverter connected with a single-phase photovoltaic (PV) system. To facilitate the control design, the system is represented in terms of state space realization with uncertainties. The controller design involves achieving proper loop shapes through the choice of the proper weighting functions. A H∞ synthesis...
In this paper, the structure of the multilevel invertor of multilevel invertor's circuit is analyzed based on ladder-wave PWM principle and waveform theory, and a method of switching angle control is proposed. The specified lower frequency harmonics is eliminated and the fundamental voltage is adjusted by controlling the switching time of power switches. The control strategy on PSPICES Simulation...
A new tracking scheme with the three sine parts controlled independently from each other is presented in this paper, by using this scheme, the switching signals of the three phases can be acquired at the same time, it can track any given magnetic flux to control the flux. By comparing the tracking and contrast, the switching state of each phase can be acquired, and combine the switching state of phase...
This paper introduces the TMS320LF2407A chip and studies its application in variable frequency speed regulation system. This system uses main circuit of AC-DC-AC voltage type frequency conversion; adopts SVPWM technology; takes TMS320LF2407A as the main control chip; and uses IPM-PW100CVA120 to the main circuit of inverter. The full digital implementation and the experimental Waveform based on TMS320LF2407A...
Five-level inverter has been applied to industry and railway traction to solve the difficulty in applying low-voltage or medium-voltage switch devices to high-voltage system. The basic principle of diode-clamped five-level inverter is analysed in this paper. Based on the analysis of diode-clamped three-level inverter, single pulse control method, pulse width modulation(PWM) control methods and a novel...
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