Multifunctional three-phase imbalance treatment device and method

Abstract

The invention discloses a multifunctional three-phase imbalance treatment device and method. The device comprises an integrated controller and a plurality of phase-change switches. The centralized controller communicates with the plurality of phase-change switches through a wireless communication module. The centralized controller detects three-phase load parameters of a transformer in a transformer area in real time, receives load parameters collected by the phase-change switch in the transformer area where the centralized controller is located, and uploads the detected three-phase load parameters and the received load parameters to a background server. The background server is connected to a man-machine interaction terminal. The method is applied to the device. A set of device integrating three-phase imbalance treatment, line loss management, transformer area fault positioning and other functions is developed by mainly using an existing phase-change switch as a platform according tothe characteristics and difficulties of operation and maintenance work of a power system, a power distribution network can be effectively monitored, and therefore active operation and maintenance areachieved, the lean management level is improved, and power supply is reliable.

Description

【Technical field】 [0001] The invention relates to the technical field of smart grid automation, in particular to a multifunctional three-phase unbalance control device and a control method applied to the device. 【Background technique】 [0002] As the end of the power network, the distribution network is directly connected to users, which keenly reflects the requirements of sensitive users in terms of safety, quality, and economy, and directly determines the power quality of these users. [0003] In the 400V low-voltage power supply mode, three-phase four-wire power supply is generally adopted. The three-phase load at the transformer outlet should be symmetrical in theory, but there are a large number of single-phase loads in the low-voltage distribution network. Due to the uneven distribution of single-phase loads and the input The time difference makes the unbalanced three-phase load a prominent problem in the operation and maintenance of low-voltage distribution network. ...

AI Technical Summary

Problems solved by technology

[0003] In the 400V low-voltage power supply mode, three-phase four-wire power supply is generally adopted. The three-phase load at the transformer outlet should be symmetrical in theory, but there are a large number of single-phase loads in the low-voltage distribution network. Due to the uneven distribution of single-phase loads and the input The time difference makes the unbalanced three-phase load a prominent problem in the operation and maintenance of low-voltage distribution network

[0006] However, the power electronic three-phase unbalance control device is installed at the head end of the station area, and the three-phase load balance at the outlet of the distribution transformer is realized by outputting compensation current. This method only improves the three-phase unbalance index, and the load on the line The size has not changed, which cannot fundamentally solve the problem of uniform distribution of actual loads; the phase-change switch type management device is equipped with a phase-change switch on the line to redistribute the load from the line, so that the loads of each phase are in a relatively balanced state, which can Fundamentally solve the problem of even distribution of actual load

The current problem is that the function is too single, the lack of functions such as line loss management and fault location that are concerned in the daily operation and maintenance work of the station area, and the product is not cost-effective, thus limiting its wide application

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