算法引入电容电流内环以抑制系统不稳定的现象，电容电流信号通过估计过程得到。
The capacitive current inner loop is used to suppress system instability and the capacitive current is obtained by estimation.
该系统包含升压和逆变两个环节，均采用电压外环、电流内环的双环pwm控制方式。
The two parts both adopt double loop PWM control mode which consists of outer voltage loop and inner current loop.
前者在常规的采用电压外环、电流内环的双闭环控制基础上，搭建数字锁相环、数字滤波器。
Digital PLL and digital filter are built based on conventional double closed-loop control which contains voltage loop and current loop.
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