The front stage uses the single-voltage-mode control strategy and the back stage uses the three states discrete pulse modulation hysteresis current control strategy.

前级采用电压单环调制方式，后级采用三态滞环离散脉冲调制电流滞环跟踪控制技术。

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On the control algorithm, using flux estimation algorithm for motor speed sensorless control, low speed startup strategy of three stage for motor start.

在控制算法上，采用了磁链估计算法实现电机无传感器控制、三段式低速启动策略启动电机。

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"If we can manage our program well, our three-stage strategy could yield potentially 470,000 megawatts of power, by the year 2050,".

VOA: standard.2009.09.29