该方法是在传统的两态滞环控制的基础上，增加过零比较器，通过优化逆变器的开关逻辑，从而实现滞环控制下并网逆变器的三态输出。
Through adding a zero-crossing comparator and optimizing the inverter switching logic, this method which is based on the traditional two-state hysteresis control can achieve three-state outputs.
微调移动X 轴接近“十”字比较尺，直到数字比较器的指示灯在零点右边变亮。
Move with the X axis micrometric movement the sharp shadow, till the digital comparator red light is on the zero right position.
它是继零磁通电流互感器、双级电流互感器和电流比较仪之后的又一种新型的电流比例标准。
It is a new current ratio standard after the zero flux current transformer, two stage current transformer and current comparator.
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