Synchronous PI controller is usually used to track current in three-phase PWM rectifier with zero steady-state error which is difficult to achieve in the single-phase system. A novel proportional-resonant (PR) control scheme for single-phase PWM rectifier is proposed in the paper. Compared with traditional PI control and current hystereis control (CHC) methods
The PR control structure is simple and can reduce control time delay Significantly. The simulation results verify the feasibility of the proposed control scheme in the disturbance rejection. PWM Rectifier In addition, sinusoidal current zero static error control can be achieved without a coordinate transformation and the DC voltage can automatically adjust to changes of grid voltage, load value and frequency which contributes to energy conversion and bidirectional flow of electricity.
- Single-phase rectifiers
- CHC control
- PR-based control
(a) The topological structure
(b) The current control dynamic block diagram
Fig 1. The topological structure and the current control dynamic block diagram of PWM rectifiers.
EXPECTED SIMULATION RESULTS:
(a) The value of DC voltage.
(b) The value of AC current.
(c) Comparison between the feedback current and the referent current
Fig.2. The simulation waves based on CHC control scheme.
(a) The value of DC voltage.
(b) The value of grid voltage and AC current
(c) The value of actual voltage and predictive error.
(d) Comparison between the feedback current and the referent current
Fig 3.The simulation waves based on PR control scheme.
(a) Current Hystereis Control(CHC)
(b) Proportional-Resonant (PR) based control.
Fig 4. The AC current spectrum.
From the above conducted studies, one can conclude that PR-based Control strategy for single-phase PWM rectifier presents better steady-state and can successfully achieve accurate regulation with fast dynamic response with minimum harmonic distortions. The simulation results show that sinusoidal current zero static error control can be achieved without a coordinate transformation and the DC voltage could automatically adjust to changes of grid voltage
load value and frequency which contributes to energy conversion and bidirectional flow of electricity. The control algorithm is easy to be realized while the robustness and power quality is improved. The highlight of paper lies in applying PR regulator to the adjustment of sinusoidal AC current zero static error , building the system model of single-phase PWM rectifier in MATLAB/Simulink with CHC and PR control scheme respectively and giving proper comparisons to some degree.
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