Household grid-connected inverter control strategy based on virtual synchronous generator

A virtual synchronization and control strategy technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as threats to the safe and stable operation of the power grid, complex design, and instability of grid-connected inverters. Simple implementation and guaranteed uninterrupted power supply

Inactive Publication Date: 2015-07-08
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The design of the droop coefficient is relatively complicated, and improper design may lead to instability of the grid-connected inverter, posing a threat to the safe and stable operation of the grid

Method used

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  • Household grid-connected inverter control strategy based on virtual synchronous generator
  • Household grid-connected inverter control strategy based on virtual synchronous generator
  • Household grid-connected inverter control strategy based on virtual synchronous generator

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0030] Such as Figure 3-6 As shown, the control strategy of a household grid-connected inverter based on a virtual synchronous generator in the present invention introduces a mathematical model of a virtual synchronous generator into the grid-connected inverter, and in the grid-connected inverter The control method of synchronous generator is added to the control link, and the grid-connected inverter is used for island detection. When a fault occurs on the grid side, it can quickly switch to the off-grid operation state. The control method of the virtual synchronous generator is: take the voltage, frequency and power at the grid-connected point A as the control target, measure and calculate the voltage, frequency, current and power values ​​at the grid-connected point, and use it as the input of the control link , the mechanical power, electro...

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Abstract

The invention relates to the technical field of power generation systems, in particular to a household grid-connected inverter control strategy based on a virtual synchronous generator. A mathematic model of the virtual synchronous generator is introduced into a grid-connected inverter, a control method of the synchronous generator is added to a control link of the grid-connected inverter, the grid-connected inverter is used for island detection, and when the power grid side breaks down, the grid-connected inverter can be quickly switched to an off-grid operation state. By the adoption of the control strategy, the household medium-small-generated output grid-connected inverter is equivalent to the synchronous generator from the aspects of input and output characteristics, and the inverter can actively participate in coordination control over the voltage and the frequency of a power system.

Description

technical field [0001] The invention relates to the technical field of power generation systems, in particular to a control strategy for a household grid-connected inverter based on a virtual synchronous generator. Background technique [0002] With the rapid growth of the national economy, the society's demand for energy is increasing. Traditional thermal power generation has caused serious environmental pollution, greenhouse effect, and resource depletion. It is imminent to vigorously promote the grid-connected project of new energy power generation. In addition, in order to alleviate the tense situation of power supply during peak hours of electricity consumption, power supply companies sometimes have to cut power to adjust the power load, which brings great inconvenience to the normal life of residents. Therefore, the development of small and medium-power new energy generation grid-connected technologies for household use is of great significance for the development and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/388H02J3/40
Inventor 盛万兴宋晓辉孟晓丽董伟杰宋斌张磊王孙安张世栋
Owner STATE GRID CORP OF CHINA
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