Active three-phase unbalance automatic adjustment device

Abstract

The invention provides an active three-phase unbalance automatic adjustment device, and belongs to the technical field of three-phase unbalance of power grids. The device comprises a sampling circuitmodule, a core control board module, a driving circuit module, an IGBT switching circuit module and a load. The sampling circuit module is configured to collect current information of the load and send the current information to the core control board module, and the core control board module is electrically connected with the driving circuit module. The core control board module generates a driving pulse signal according to the received current information, and the driving circuit module and the IGBT switching circuit module are electrically connected. The driving circuit module amplifies thedriving pulse signal and sends the amplified driving pulse signal to the IGBT switching circuit module, and the IGBT switching circuit module is configured to convert the electric energy into a compensation current and feed back the compensation current to the load. The device of the invention can automatically adjust the three-phase unbalance, and the whole device is safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of power grid three-phase unbalance, and in particular relates to an active three-phase unbalance automatic adjustment device. Background technique [0002] As one of the power quality problems, the three-phase unbalance problem has long been proposed, but how much harm the three-phase unbalance will bring to the power system, and how much loss it will bring to the system, there is still a lack of research in this area. And with the development and application of high and new technologies such as power electronics and communication, the reasons for the three-phase unbalance of the power network are becoming more complicated. There are already some control measures for the three-phase unbalance problem, mainly through the way of adjusting reactive power and adding arc suppression coils. Problems such as harmonic amplification often occur when compensation is made by adjusting reactive power; adding arc suppre...

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Problems solved by technology

[0002] As one of the power quality problems, the three-phase unbalance problem has long been proposed, but how much harm the three-phase unbalance will bring to the power system, and how much loss it will bring to the system, there is still a lack of research in this area. And with the development and application of high-tech such as power electronics and communication, the reasons for the three-phase unbalance of the power network are becoming more complicated.

There are already some control measures for the three-phase unbalance problem, mainly through the way of adjusting reactive power and adding arc suppression coils. Problems such as harmonic amplification often occur when compensation is made by adjusting reactive power; adding arc suppression The coil can only reduce the capacitive current, and has no real significance in solving the three-phase unbalance problem, and sometimes even increases the three-phase unbalance degree. Therefore, these two methods currently solve the three-phase unbalance problem The effect is not good

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