三相电压源型SPWM整流器标幺值换算及仿真

Conversion by P. U. and Its Relevant Simulation of Three-Phases VSR in SPWM Mode

在三相电压源型SPWM整流器优化设计的研究中,利用标幺值换算的方法可以解决三相电压源型SPWM整流器在大功率应用工况时的复杂计算问题。由于测量点电量大,造成测量不准确。为此,以整流变压器阀侧额定值为基准,研究了采用直接电流控制策略时单位功率因数工况下系统参数的标幺值设计问题,给出了按照标幺值换算后各系统设计参数的修正公式,说明了整流变压器不同联接组别对整流器设定值的影响,通过仿真对该标幺值换算的方法进行了验证,为设备在较大功率应用要求时的标幺值设计提供了系统的理论依据和工程设计方法。

The complicated controlling computation can be simplified by means of converting the measuremental data to p.u. value for the three-phases VSR in a huge power work conditions. In this paper, a p. u conversion meth- od was put forward refering to the valve side of the rectifier transformer aimed at the unity-power factor control effect used by the direct current control strategy. Meanwhile, the p.u. conversion problems under the different connection group of the rectifier transformer were discussed. At last, the p.u. conversion method and discussion were verifed by relevant simulation, which verifies that the systemic p.u. analytical means can improve the design of three-phases VSR under the great power mode.