Greedy algorithm-based scheduling policy for three-phase load balance of real-time-allocating distribution network

Abstract

The invention provides a greedy algorithm-based scheduling policy for the three-phase load balance of a real-time-allocating distribution network and relates to a scheduling policy for the three-phase load balance of the real-time-allocating distribution network. The scheduling policy comprises the steps of (1) establishing an array Z with the length thereof to be equal to the number of slave switching devices in the distribution network; (2) conducting the real-time online detection on the total currents of three phases Ia_ph, Ib_ph and Ic_ph, and the currents of all users loads of the slave switching devices; (3) determining the value of epsilon; (4) sorting user loads respectively accessed to three phases of A, B and C in the monotonically increasing manner, and respectively storing in linked lists a, b and c; and so on. Compared with the conventional algorithm, a corresponding scheduling scheme can be found out more quickly based on the greedy algorithm. Meanwhile, a plurality of slaves can be simultaneously controlled in the online manner, so that the three-phase unbalance degree of the distribution network is quickly decreased within a short period of time. Therefore, the time-varying characteristics of the electrical loads of the distribution network can be treated.

Description

technical field [0001] The invention relates to a scheduling strategy for real-time distribution of three-phase load balance in a distribution network, and is a scheduling strategy for controlling three-phase imbalance in a distribution network. Background technique [0002] There are a large number of single-phase loads in the distribution network. Due to the unbalanced distribution of single-phase loads and the asynchronous input, the imbalance of three-phase loads has become a prominent problem in the operation and maintenance of low-voltage power grids. The unbalanced three-phase load will increase the loss of the power grid, which will greatly reduce the quality of the power supply voltage of the heavy-duty phase in the distribution network, resulting in a decrease in the output of the distribution network transformer and a decrease in the efficiency of power conversion. [0003] The three-phase load balancing work of the distribution network has received more and more ...

AI Technical Summary

Problems solved by technology

The unbalanced three-phase load will increase the loss of the power grid, which will greatly reduce the quality of the power supply voltage of the heavy-duty phase in the distribution network, resulting in a decrease in the output of the distribution network transformer and a decrease in the efficiency of power conversion.

[0004] However, at present, the scheduling algorithm of the master dispatching part and the slave switching part of the three-phase lossless balance load device is still developing slowly, and it is impossible to switch multiple slaves at the same time. It is impossible to adjust the phase sequence of the electric load in time when the three-phase load unbalance exceeds the limit, and there is a problem that the dispatch cycle is too long

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