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A method for improving the voltage quality of distribution network based on single-phase photovoltaic inverter

A photovoltaic inverter, voltage quality technology, applied in the direction of AC network voltage adjustment, multi-phase network asymmetry reduction, multi-phase network elimination/reduction of asymmetry, etc., can solve the problem of poor system scalability, centralized controller Communication and computing pressure, system collapse and other problems, to achieve the effect of improving scalability and robustness, and improving the quality of power supply voltage

Active Publication Date: 2021-05-04
重庆涪陵电力实业股份有限公司
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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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  • A method for improving the voltage quality of distribution network based on single-phase photovoltaic inverter
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  • A method for improving the voltage quality of distribution network based on single-phase photovoltaic inverter

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[0025]The technical solutions in the present invention and / or prior art will be described more clearly, and the specific embodiments of the present invention will be described below. It will be apparent that the drawings in the following description are merely some embodiments of the invention, and those of ordinary skill in the art will also obtain other drawings according to these figures without paying creative labor. Other embodiments.

[0026]Appendfigure 1 As shown, the present invention is designed to design a voltage regulation method of the three-phase four-wire unbalanced distribution network by utilizing the reactive power available for one-phase PV inverter distributed in the distribution network. In the figure, A, B, C are the phase line, and n is the centerline. A single-phase PV inverter can be used in two ways to the network.

[0027]Step 1: Conforms the single-phase photovoltaic inverter distributed in the distribution network constitutes a plurality of distributed tria...

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Abstract

The present invention proposes a distribution network voltage quality improvement method based on single-phase photovoltaic inverters, which comprehensively applies multiple single-phase photovoltaic inverters distributed in the distribution network, and uses single-phase photovoltaic inverters to form Multiple distributed delta compensation groups and multiple distributed star compensation groups. Each distributed delta compensation group performs on-site compensation for three-phase voltage imbalance, and multiple distributed star compensation groups cooperate to compensate for voltage deviations in the distribution network, and single-phase photovoltaic inverters exchange reactive power through a local communication network Utilization rate information, adopt distributed consensus algorithm to calculate reactive power reference value, realize fairness in the same sense of reactive capacity utilization rate while compensating for voltage deviation.

Description

Technical field[0001]The present invention belongs to the field of distribution mesh voltage quality, and more particularly to a power supply line voltage quality lifting method based on a single-phase photovoltaic inverter.Background technique[0002]Today's power system contains all kinds of imbalance factors, the normal imbalance problem is caused by three phases in the electric arc furnace and the traction load in the electric arc furnace in the smelting system, and the normal sexual imbalance. There is longer existence or persistent. Three-phase imbalance in the power distribution network will result in an increase in the loss of the phase line, which causes harm to the normal operation of the electric equipment and the transformer of the powerway, causing the temperature rise of the metal part of the transformer and decreased, causing the induction motor. Reduce and lower the motor life. In addition, the power supply voltage deviation of the distribution network is also an impor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/26H02J3/16
CPCH02J3/16H02J3/26Y02E40/30Y02E40/50
Inventor 朱建军吴江黄伟钢陈磊康鹏曾琳枫
Owner 重庆涪陵电力实业股份有限公司
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