The paper finds out a formula to estimate the inductance value of current following inverter on the basis of tracking instruction current signal by hysteretic comparison.

从采用滞环比较方式跟踪指令电流信号出发，推导出电流跟踪型逆变器中输出电感值的估算公式。

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And then the control strategy is formulated, the tracking control of instruction current is realized. On the basis of the work above the compensation current needed is produced by the dual-phase SVG.

制定了双相型SVG的控制策略，实现对指令电流的跟踪控制，使SVG输出所需的补偿电流。

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But the current moves by schools to start earlier don't affect the number of days of instruction, which are generally set in teacher contracts.

WSJ: School in August Gets Low Grades