抄録
In this paper, novel methods of making standard sin waves for PWM converters, and novel PLL systems for STATCOM's and UPS's will be proposed. The single-phase utility voltage is transformed to a pseudo three-phase voltage, and this three-phase voltage is used for the phase detection. Standard sin and cos waves made by these methods suffer little influence from voltage unbalance and distortion of utility voltages. Therefore these methods can be used for the STATCOM to reduce the influence of unbalanced system voltage disturbances such as 2LS.
