Energy-saving method and device based on power grid load dynamic balance

Abstract

The invention relates to a method and device for performing on-load scheduling on a single-phase load in the intelligent power grid field. A master controller is mounted at an input end of a three-phase wire, a secondary controller is mounted at each single-phase branch of the wire, and the master controller exchanges information with the secondary controllers through communication interfaces. When the wire power unbalanced degree is over limit, the master controller optimizes and formulates a control scheme to operate the secondary controllers to convert the single-phase load between the phases; in the conversion process, the load is free from instant power off, and the power grid is free from impact and interference; and therefore, the distribution circuit dynamically runs in a load balance state, the unbalanced consumption problem of the circuit is completely solved.

Description

technical field [0001] The invention belongs to the technical field of smart grid automation, and relates to a method and a device for on-load commutation of electric loads, in particular to a brand-new technology for realizing energy saving by controlling dynamic balance of loads. Background technique [0002] The end users of the power system include a large number of single-phase loads, especially commercial and residential facilities: such as electric heating facilities, air conditioners, electric water heaters, refrigerators, lighting facilities, commercial machinery, computers and various household appliances. The number of them is increasing, the power is increasing, the requirements for power supply reliability and quality are getting higher and higher, and the randomness of power demand is becoming stronger and stronger, which makes the three-phase loads on the low-voltage side of the distribution network different The balance problem is getting worse. [0003] As ...

AI Technical Summary

Problems solved by technology

But the patent has a key question on the load balancing method: how to choose which load to switch? How to convert online? How to take into account active and reactive work is not involved

[0010] The relationship between voltage unbalance and unbalanced load is affected by the internal resistance of the power supply, which makes it difficult to reflect the unbalanced load line loss, let alone the balance of active and reactive power; the method of switching 10% load between phases each time lacks theoretical support ; It is also difficult to avoid power outage troubles when switching loads with ordinary composite switches; these are key issues that must be solved for load dynamic balance

[0011] It is precisely because of the lack of load-on-load commutation equipment and the lack of load dynamic balance theory that the static balance method has been used to deal with the problem of load imbalance.

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