A new scheme for three-phase PWM converter without AC voltage sensor

The paper present an optimal robust waveform controller using H_∞ optimization theory for three phase converter. In general D-Q axis synchronous frame to realizing a decoupling current control, the input net voltage must be measured. To decrease the cost and control the system at ease, a new scheme for three phase PWM converter without net voltage sensor is present in this paper. The input voltages in the system are treated as a disturbance variable. H_∞ optimization theory is suitable to design the waveform controller with disturbance noises of the three-phase converter. The stability and performance requirements for the converter can be expressed in terms of ||·|| norm of closed loop transfer and sensitivity functions and appropriate weighting functions, the controller achieves stability and performance robustness in the presence of input voltage sensorless control with H_∞ optimal arithmetic. The feasibility and advantage of the control scheme is verified by simulation and experimental results.