When the regulation is performed by variable flow rate, there exist two operation regulation modes with fixed zero pressure difference and variable zero pressure difference.

采用变流量调节时，存在定零压差点和变零压差点两种运行调节方式。

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Owing to the successful application of HSE management, zero injury and zero accident were achieved during the operation of VSP logging in many Wells, and a 100% fineness ratio was achieved.

由于HSE管理的成功运用，使多口井的VS P测井作业达到零伤害、零事故的目标，成果的优良率达100%。

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Finally, the operation principle of Zero-voltage and Zero-current-switching PWM three-level converter is validated by the simulation analyze and the debugging experiment of 50V/20A sample device.

最后，通过仿真分析和对50V/20A样机的调试实验，验证了零电压零电流移相控制PWM三电平直流变换器的工作原理。

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