Electric energy quality comprehensive optimization control system and method for low-voltage power distribution network

Abstract

The invention discloses an electric energy quality comprehensive optimization control system and method for the low-voltage power distribution network. The control system comprises a system optimization controller connected with active meter box-type electric energy quality treatment function units through wireless communication, the number of the active meter box-type electric energy quality control function units is more than one, and the active meter box-type electric energy quality control function units are respectively installed on branch nodes of a low-voltage distribution line. The control system is advantaged in that an optimal working mode can be automatically selected by the system, and the target requirement of minimum system loss is met as much as possible while the treatmenteffect is ensured.

Description

technical field [0001] The invention belongs to low-voltage distribution network power quality control technology, in particular to a low-voltage distribution network power quality comprehensive optimization control system and control method. Background technique [0002] In the low-voltage distribution network, especially in the low-voltage distribution network system of the rural power grid, most of the power loads are single-phase loads, and the types of power load characteristics of the low-voltage distribution network have increased, and some new power consumption characteristics have emerged. Influenced by factors such as power consumption problems and the difference in power consumption time of each load in the low-voltage grid, the three-phase imbalance problem exists objectively and in real time. In some low-voltage distribution station areas, the three-phase imbalance problem seriously restricts the transformer output and power supply quality, causing low-voltage T...

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Problems solved by technology

[0002] In the low-voltage distribution network, especially in the low-voltage distribution network system of the rural power grid, most of the power loads are single-phase loads, and the types of power load characteristics of the low-voltage distribution network have increased, and some new power consumption characteristics have emerged. Influenced by factors such as power consumption problems and the difference in power consumption time of each load in the low-voltage grid, the three-phase imbalance problem exists objectively and in real time. In some low-voltage distribution station areas, the three-phase imbalance problem seriously restricts the transformer output and power supply quality, causing low-voltage The increase of power line loss; and with the economic development, more and more nonlinear loads, harmonics and reactive power problems are becoming more and more prominent; power electronics technology has absolute technology for the treatment of power quality problems in low-voltage distribution networks Advantages, but the power quality optimization management system based on power electronics technology has a large loss. While optimizing the power quality problem of the low-voltage distribution network, it has caused an increase in the loss rate of the low-voltage distribution network system, which is not allowed by the distribution network. There are technical defects

[0003] Chinese patent application No. 201710279465.9 proposes a method of using active power filters and commutation switches to solve power quality problems in distribution networks. Active power filters mainly solve harmonic problems and reactive power problems, and the capacity of active power filters is relatively large. , to meet the requirements of reactive power compensation and harmonics of the low-voltage distribution network, the loss of the system will be large

[0004] Chinese patent application No. 201610622366.1 proposes a method to realize the low-voltage problem at the end of low-voltage distribution lines by compensating reactive power and commutation switch adjustment, aiming at inductive reactive power and three-phase unbalance control to solve the problem of low voltage, but with distributed The large-scale access of new energy to the low-voltage distribution network may cause the emergence of high voltage and non-linear loads, so it is impossible to effectively realize the compensation of capacitive reactive power to achieve a qualified voltage, and the two-way flow of distributed new energy access to the power flow causes capacitors to be cast. All abnormalities and other issues are not considered

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