Three-phase four-wire balance optimization phase modulation system

Abstract

The invention provides a three-phase four-wire balance optimization phase modulation system. A current acquisition unit acquires real-time input current of a user side input end and feeds back the real-time input current to a wireless communication unit; a multifunctional meter measures three-phase output current in real time and feeds back the three-phase output current to the wireless communication unit; the wireless communication unit feeds back the acquired real-time temperature information, input current and three-phase output current information of the multifunctional meter to the background control system; the background control system judges the unbalance degree according to the three-phase output current information measured by the multifunctional meter and the real-time input current of the user side and generates a control switching scheme, and the background control system sends phase-change switch control data generated based on the control switching scheme to the wirelesscommunication unit; the wireless communication unit analyzes the received commutation switch control data and then sends the analyzed commutation switch control data to the switch control unit; and the switch control unit generates a corresponding control signal according to the received phase-change switch control data so as to control the switching state of the phase-change switch module.

Description

technical field [0001] The invention relates to the technical field of power consumption control, in particular to a three-phase four-wire balance optimization phase modulation system. Background technique [0002] The three current imbalances in the low-voltage power grid are serious, and the damage is serious and complicated. The three current imbalances will cause neutral point drift and electrification, resulting in voltage reduction and a large amount of electric energy "running" to the ground; when the imbalance is serious, zero sequence The current can reach about 100A, which is seriously biased, so that the temperature of the transformer rises and burns out; the imbalance of the three currents is more serious in rural areas. During droughts, a large number of farmers use 220V motor pumps to pump water for irrigation, add water to fish ponds, and suddenly concentrate serious problems. The three items are unbalanced, the zero-sequence current generated is often greater...

AI Technical Summary

Problems solved by technology

The three-phase unbalance problem will not only lead to increased losses, but also other adverse consequences, such as: causing long-term overheating of transformer windings, affecting the service life of distribution transformers, and even burning out transformers in serious cases; the three-phase deviation of user end voltage is large , the voltage quality is not guaranteed

[0005] At present, the treatment of three-phase unbalance basically adopts manual methods, which requires power outage operations, and the manual workload is relatively large. At the same time, there are still certain hidden dangers in operation safety.

In addition, because the power consumption of users is constantly changing, manual management can only solve the imbalance problem for a period of time, and cannot guarantee the long-term continuous balance of the three-phase load in the station area

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