Method for improving voltage quality of power distribution network based on single-phase photovoltaic inverters

Abstract

The invention provides a method for improving the voltage quality of a power distribution network based on single-phase photovoltaic inverters. The method comprises the steps of: carrying out comprehensive application of a plurality of single-phase photovoltaic inverters distributed in the power distribution network, and forming a plurality of distributed triangular compensation groups and a plurality of distributed star-shaped compensation groups by applying the single-phase photovoltaic inverters. Each distributed triangular compensation group carries out three-phase voltage imbalance on-site compensation. The plurality of distributed star-shaped compensation groups cooperate with each other to perform power distribution network voltage deviation compensation, and the single-phase photovoltaic inverters exchange reactive capacity utilization rate information through a local communication network, calculate a reactive power reference value by adopting a distributed consistency algorithm, and achieves fairness in the same meaning of the reactive capacity utilization rate while compensating voltage deviation.

Description

technical field [0001] The invention belongs to the technical field of distribution network voltage quality, and in particular relates to a distribution network voltage quality improvement method based on a single-phase photovoltaic inverter. Background technique [0002] Today's power system contains various unbalanced factors. The normal unbalanced problem is caused by the three-phase asymmetry in the power grid, such as the electric arc furnace in the smelting system and the traction load in the electrified track. The normal unbalanced state can be Exist or persist for a long time. The three-phase imbalance in the power distribution network will lead to an increase in the loss on the phase line, which will cause harm to the normal operation of the electrical equipment and the transformer in the distribution station area, cause the temperature of the local metal parts of the transformer to increase and reduce the output, and cause the active output of the induction motor ...

AI Technical Summary

Problems solved by technology

[0003] The access of a large number of distributed power sources is the trend of the future distribution network. There have been studies on the use of distributed power sources for distribution network voltage regulation, power control and three-phase unbalance compensation. There are few studies on the comprehensive treatment of balance and voltage deviation

On the other hand, at present, most of the control systems using distributed power supply are centralized control methods. There is a single point of failure of the centralized controller that causes the system to crash, and the communication and calculation pressure of the centralized controller is high. Plug and Play Requirements

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