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A voltage regulation method for series supply lines based on photovoltaic inverter phase modulation

A photovoltaic inverter and line technology, applied in photovoltaic power generation, circuit devices, AC network circuits, etc., can solve the problems of increasing active power and reactive power loss of the power grid, and achieve low total reactive power absorption and small reactive power loss Effect

Active Publication Date: 2019-07-12
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the photovoltaic active power output is very large, and it happens to be the peak of the user's power consumption, the voltage of the grid-connected point does not exceed the limit at this time, and a large amount of reactive power output will increase the active power and reactive power loss of the grid.

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  • A voltage regulation method for series supply lines based on photovoltaic inverter phase modulation
  • A voltage regulation method for series supply lines based on photovoltaic inverter phase modulation
  • A voltage regulation method for series supply lines based on photovoltaic inverter phase modulation

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Embodiment Construction

[0031] A method for voltage regulation of string supply lines based on phase modulation of photovoltaic inverters proposed by the present invention will be described in detail below in combination with embodiments. It should be emphasized that the following descriptions are only exemplary, and are not intended to limit the scope and application of this embodiment.

[0032] The example is the power grid in southern Xinjiang, the topological diagram of the power grid is as follows figure 2 shown. Among them, the Aksu-Bachu and Bachu-Kashgar lines are long-distance 750kV overhead lines, and the rest are 220kV overhead lines, forming a typical series power grid. Among them, Aksu, Bachu, and Kashi nodes are installed with 750 / 220 / 63kV three-winding transformer, Jinlu, Markit, Shache, Yingjisha, Oytak nodes are connected with large-capacity photovoltaic systems. Build a grid model in DIgSILENT based on actual grid data, such as image 3 shown. Assuming the Aksu node as a balan...

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Abstract

The invention discloses a series power supply circuit voltage regulation method based on photovoltaic inverter phase modulation. The series power supply circuit is subjected to voltage regulation based on the phase modulation operating capability of the photovoltaic inverter; common Q(U) and cos<phi> (P) control strategies are improved, so that reactive support can be provided for a power grid at any time while investment of dynamic reactive compensation equipment can be reduced for a photovoltaic power station; and by calling all photovoltaic inverters to be participated in power grid voltage adjustment, the minimum of reactive absorption total quantity, and lowest power grid active and reactive loss can be realized.

Description

technical field [0001] The invention belongs to the field of photovoltaic inverters, and in particular relates to a voltage regulation method for series supply lines based on phase modulation of photovoltaic inverters. Background technique [0002] As a renewable green energy, solar energy is inexhaustible, pollution-free, and low-cost. It is recognized as one of the most important new energy sources in the 21st century. Countries around the world are competing to use huge R&D teams and huge funds to study solar power generation technology. Among them, photovoltaic power generation is favored because of its abundant source of battery material silicon and low cost. Its basic principle is to realize the conversion from light energy to electrical energy through the photovoltaic effect on the surface of solar cells. Photovoltaic power generation is of great significance to optimize the energy structure, promote energy conservation and emission reduction, and achieve sustainabl...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/16H02J3/38
CPCH02J3/16H02J3/383H02J2203/20Y02E10/56Y02E40/30
Inventor 汤奕戴剑丰陈良耳刘煜谦李峰朱亮亮王琦
Owner SOUTHEAST UNIV