Automatic commutation device detection device and method based on PWM converter

Abstract

The invention relates to an automatic commutation device detection device and method based on a PWM converter, and belongs to the technical field of device detection. The detection device comprises the PWM converter, a field controller, a wireless handheld terminal and a three-phase symmetrical load. The field controller comprises a converter control module, a data analysis module, a phase selector receiving module, a control chip and a first radio frequency signal transceiving module, and the wireless hand-held terminal comprises a microprocessor, a touch liquid crystal display screen, a second radio frequency signal transmit-receive module and other structures. According to the automatic commutation device detection device and method based on the PWM converter, a detection way for the performance of a current low-voltage automatic phase-change device is provided, the situation that the current low-voltage automatic phase-change device is put in use on the premise that the performanceof the low-voltage automatic phase-change device is unknown is avoided, and further the loss caused by cutting off the power supply of the users after the device is used for the on-site test and maintenance is avoided, and the potential safety operation hidden dangers are avoided.

Description

technical field [0001] The invention belongs to the technical field of equipment detection, and in particular relates to a detection device and method for automatic phase-commutation equipment based on a PWM converter. Background technique [0002] At present, most of my country's low-voltage distribution network supplies power to users in a three-phase four-wire system through 10kV / 0.4kV transformers. However, due to the dispersion of users, the diversity of loads and the randomness of cut-in, almost all low-voltage distribution networks have three-phase unbalance problems. This three-phase unbalance problem will lead to line loss in the power grid and increase the copper loss and iron loss of the transformer, and even reduce the output of the transformer, which will affect the normal supply of electric energy and reduce the quality of electric energy, endangering the safe operation of the system and users. safe electricity use. [0003] In order to solve this problem, it...

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Problems solved by technology

However, due to the dispersion of users, the diversity of loads and the randomness of cut-in, almost all low-voltage distribution networks have three-phase unbalance problems

This three-phase unbalance problem will lead to line loss in the power grid and increase the copper loss and iron loss of the transformer, and even reduce the output of the transformer, which will affect the normal supply of electric energy and reduce the quality of electric energy, endangering the safe operation of the system and users. Safe use of electricity

[0003] In order to solve this problem, it is feasible to manually change the line to adjust the load, but it is neither safe nor economical. Therefore, low-voltage automatic commutation load balancing equipment has been widely used in the power grid to realize the automatic adjustment of the three-phase imbalance problem. governance

However, the low-voltage automatic commutation load balancing equipment currently in use has some problems such as insufficient adjustment ability, low accuracy, and high failure rate, which has brought many economic losses to the power grid and power companies.

In addition, when the automatic commutation load balancing equipment is put into operation on site, it is often necessary to test its performance and other aspects in the state of power outage, which will not only expand the scope of power outages for users, but also bring some electric shocks to site operators. risk

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