Abstract: The present invention relates to a differentiated control method of the cascaded active power filter, wherein the cascaded links are divided into low frequency links and high frequency links; wherein low frequency links are used to generate the fundamental voltage generated by the cascaded multilevel converter; wherein high frequency links are used to produce different, separate voltage from the aforementioned fundamental voltage generated by the cascaded multilevel converter; wherein according to the given cycle, some links are selected circularly from cascaded links as the high frequency links; wherein in the control cycle, each phase links with the maximum and minimum DC capacitor voltage, as well as those links that the pulse width modulation (PWM) combination discharge and charge most to DC capacitor are found out.

Abstract: The present application relates to a bypass control structure of a link unit of a chain circuit active power filter and a control method thereof. The bypass control structure includes a main controller, a chain circuit multilevel inverter and a reactor connected to an external electric network. The chain circuit multilevel inverter generally comprises multiple levels of link units. A state of the switch means in each link unit in a chain circuit active power filer is detected in real time, and types of detected faults are classified so as to bypass the fault of the link unit with fault by utilizing the control of the switch means without fault in the link unit with fault. Normal operating, stability, reliability, high efficiency of the active power filter are ensured. Therefore, the problem that the operation must be suspended until the fault is eliminated is solved without any additional bypass means.

Abstract: The present application relates to a bypass control structure of a link unit of a chain circuit active power filter and a control method thereof. The bypass control structure includes a main controller, a chain circuit multilevel inverter and a reactor connected to an external electric network. The chain circuit multilevel inverter generally comprises multiple levels of link units. A state of the switch means in each link unit in a chain circuit active power filer is detected in real time, and types of detected faults are classified so as to bypass the fault of the link unit with fault by utilizing the control of the switch means without fault in the link unit with fault. Normal operating, stability, reliability, high efficiency of the active power filter are ensured. Therefore, the problem that the operation must be suspended until the fault is eliminated is solved without any additional bypass means.

Abstract: The present invention discloses a method and a spectrum water generator for processing water with an electromagnetic field, wherein the spectrum water generator comprises a water pipe 1, iron core 2, coil 3 and control circuit, said iron core 2 is a ring-form iron core 2 with air gap 4, said iron core 2 is made up of D44 silicon-steel sheets; said water pipe 1 is plugged in said air gap 4; said coil 3 is placed at both sides of said air gap 4, the input and output ends L1, L2 of said coil 3 are connected with control circuit, the control circuit is connected with power supply. With the spectrum water generator of the present invention, tap water and drinking water can be processed into high-quality water of high oxygen intensity, smaller water particles, and permeates into the human body through drinking or shower, thus improves the micro-circulation of human body and achieves the goal of heath keeping and disease treatment.